]> git.bitcoin.ninja Git - rust-lightning/commitdiff
Move router to a separate module
authorGleb Naumenko <naumenko.gs@gmail.com>
Sat, 2 May 2020 13:37:38 +0000 (09:37 -0400)
committerGleb Naumenko <naumenko.gs@gmail.com>
Tue, 12 May 2020 13:27:11 +0000 (09:27 -0400)
13 files changed:
fuzz/src/chanmon_consistency.rs
fuzz/src/full_stack.rs
fuzz/src/router.rs
lightning/src/lib.rs
lightning/src/ln/channelmanager.rs
lightning/src/ln/functional_test_utils.rs
lightning/src/ln/functional_tests.rs
lightning/src/ln/mod.rs
lightning/src/ln/onion_utils.rs
lightning/src/ln/router.rs [deleted file]
lightning/src/routing/mod.rs [new file with mode: 0644]
lightning/src/routing/router.rs [new file with mode: 0644]
lightning/src/util/macro_logger.rs

index 135249f7414479c8405003f4fd57398f536c9035..e6b7805f8b7f542d3c726aff5f8fd5b625937014 100644 (file)
@@ -27,7 +27,6 @@ use lightning::chain::keysinterface::{KeysInterface, InMemoryChannelKeys};
 use lightning::ln::channelmonitor;
 use lightning::ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdateErr, HTLCUpdate};
 use lightning::ln::channelmanager::{ChannelManager, PaymentHash, PaymentPreimage, PaymentSecret, ChannelManagerReadArgs};
-use lightning::ln::router::{Route, RouteHop};
 use lightning::ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 use lightning::ln::msgs::{CommitmentUpdate, ChannelMessageHandler, ErrorAction, UpdateAddHTLC, Init};
 use lightning::util::enforcing_trait_impls::EnforcingChannelKeys;
@@ -36,6 +35,8 @@ use lightning::util::logger::Logger;
 use lightning::util::config::UserConfig;
 use lightning::util::events::{EventsProvider, MessageSendEventsProvider};
 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
+use lightning::routing::router::{Route, RouteHop};
+
 
 use utils::test_logger;
 
index afdb5a83877b2a9669fbcadf6bb75be0fc073061..cf8a86680b8d6c59461c485ae29a6fe2a92d40a1 100644 (file)
@@ -23,7 +23,7 @@ use lightning::chain::keysinterface::{InMemoryChannelKeys, KeysInterface};
 use lightning::ln::channelmonitor;
 use lightning::ln::channelmanager::{ChannelManager, PaymentHash, PaymentPreimage, PaymentSecret};
 use lightning::ln::peer_handler::{MessageHandler,PeerManager,SocketDescriptor};
-use lightning::ln::router::Router;
+use lightning::routing::router::Router;
 use lightning::util::events::{EventsProvider,Event};
 use lightning::util::enforcing_trait_impls::EnforcingChannelKeys;
 use lightning::util::logger::Logger;
index 2ff160e4ec844406ef1ff523be18ab6aff7b1532..7dd439bef4abaf486d03dd1bfdcdd0e853ba8672 100644 (file)
@@ -8,7 +8,7 @@ use lightning::ln::channelmanager::ChannelDetails;
 use lightning::ln::features::InitFeatures;
 use lightning::ln::msgs;
 use lightning::ln::msgs::RoutingMessageHandler;
-use lightning::ln::router::{Router, RouteHint};
+use lightning::routing::router::{Router, RouteHint};
 use lightning::util::logger::Logger;
 use lightning::util::ser::Readable;
 
index 039f2f3aca1c9e36422aae2bea755f0de4c931cb..23645ab189aec1c06de223a6a6cad88f1eeceaac 100644 (file)
@@ -26,3 +26,5 @@ extern crate bitcoin;
 pub mod util;
 pub mod chain;
 pub mod ln;
+pub mod routing;
+
index bbb7ea300a57a2b84e4e33d098cd115d848b6633..4d7f5aa8b8c0af6324005c81928143fec591056e 100644 (file)
@@ -4,7 +4,7 @@
 //! responsible for tracking which channels are open, HTLCs are in flight and reestablishing those
 //! upon reconnect to the relevant peer(s).
 //!
-//! It does not manage routing logic (see ln::router for that) nor does it manage constructing
+//! It does not manage routing logic (see routing::router for that) nor does it manage constructing
 //! on-chain transactions (it only monitors the chain to watch for any force-closes that might
 //! imply it needs to fail HTLCs/payments/channels it manages).
 
@@ -31,7 +31,7 @@ use chain::transaction::OutPoint;
 use ln::channel::{Channel, ChannelError};
 use ln::channelmonitor::{ChannelMonitor, ChannelMonitorUpdate, ChannelMonitorUpdateErr, ManyChannelMonitor, HTLC_FAIL_BACK_BUFFER, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD_BLOCKS, ANTI_REORG_DELAY};
 use ln::features::{InitFeatures, NodeFeatures};
-use ln::router::{Route, RouteHop};
+use routing::router::{Route, RouteHop};
 use ln::msgs;
 use ln::onion_utils;
 use ln::msgs::{ChannelMessageHandler, DecodeError, LightningError};
index 4a56ea412c6c321099dc58b4e58e03c6686fd0fe..50dd6b956318c54545974fdcba5537c7c4fc435f 100644 (file)
@@ -6,7 +6,7 @@ use chain::transaction::OutPoint;
 use chain::keysinterface::KeysInterface;
 use ln::channelmanager::{ChannelManager, ChannelManagerReadArgs, RAACommitmentOrder, PaymentPreimage, PaymentHash, PaymentSecret, PaymentSendFailure};
 use ln::channelmonitor::{ChannelMonitor, ManyChannelMonitor};
-use ln::router::{Route, Router, RouterReadArgs};
+use routing::router::{Route, Router, RouterReadArgs};
 use ln::features::InitFeatures;
 use ln::msgs;
 use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler};
index af4989583112bb9bf9be9b57944ff6b634e18ec0..5abddcf032249f9332c359011ac6a9bc77810c67 100644 (file)
@@ -12,7 +12,7 @@ use ln::channelmonitor::{ChannelMonitor, CLTV_CLAIM_BUFFER, LATENCY_GRACE_PERIOD
 use ln::channelmonitor;
 use ln::channel::{Channel, ChannelError};
 use ln::{chan_utils, onion_utils};
-use ln::router::{Route, RouteHop};
+use routing::router::{Route, RouteHop};
 use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
 use ln::msgs;
 use ln::msgs::{ChannelMessageHandler,RoutingMessageHandler,HTLCFailChannelUpdate, ErrorAction};
index 38396dd74fc8cad6d1df3450644640c3a04f7610..33f1c5bc1cfb019eb9937b12b5b22502f7dee56a 100644 (file)
@@ -12,7 +12,6 @@
 pub mod channelmanager;
 pub mod channelmonitor;
 pub mod msgs;
-pub mod router;
 pub mod peer_handler;
 pub mod chan_utils;
 pub mod features;
index 4128d09905f0a2ee5379c95f1b5f730b83656fc5..52e7d2fefc882d955166d717730c0990b56f4f0f 100644 (file)
@@ -1,6 +1,6 @@
 use ln::channelmanager::{PaymentHash, PaymentSecret, HTLCSource};
 use ln::msgs;
-use ln::router::RouteHop;
+use routing::router::RouteHop;
 use util::byte_utils;
 use util::chacha20::ChaCha20;
 use util::errors::{self, APIError};
@@ -472,7 +472,7 @@ pub(super) fn process_onion_failure<T: secp256k1::Signing>(secp_ctx: &Secp256k1<
 mod tests {
        use ln::channelmanager::PaymentHash;
        use ln::features::{ChannelFeatures, NodeFeatures};
-       use ln::router::{Route, RouteHop};
+       use routing::router::{Route, RouteHop};
        use ln::msgs;
        use util::ser::{Writeable, Writer};
 
diff --git a/lightning/src/ln/router.rs b/lightning/src/ln/router.rs
deleted file mode 100644 (file)
index 037303d..0000000
+++ /dev/null
@@ -1,2662 +0,0 @@
-//! The top-level routing/network map tracking logic lives here.
-//!
-//! You probably want to create a Router and use that as your RoutingMessageHandler and then
-//! interrogate it to get routes for your own payments.
-
-use bitcoin::secp256k1::key::PublicKey;
-use bitcoin::secp256k1::Secp256k1;
-use bitcoin::secp256k1;
-
-use bitcoin::hashes::sha256d::Hash as Sha256dHash;
-use bitcoin::hashes::Hash;
-use bitcoin::hash_types::BlockHash;
-use bitcoin::blockdata::script::Builder;
-use bitcoin::blockdata::opcodes;
-
-use chain::chaininterface::{ChainError, ChainWatchInterface};
-use ln::channelmanager;
-use ln::features::{ChannelFeatures, NodeFeatures};
-use ln::msgs::{DecodeError,ErrorAction,LightningError,RoutingMessageHandler,NetAddress};
-use ln::msgs;
-use util::ser::{Writeable, Readable, Writer, ReadableArgs};
-use util::logger::Logger;
-
-use std::cmp;
-use std::sync::{RwLock,Arc};
-use std::sync::atomic::{AtomicUsize, Ordering};
-use std::collections::{HashMap,BinaryHeap,BTreeMap};
-use std::collections::btree_map::Entry as BtreeEntry;
-use std;
-
-/// A hop in a route
-#[derive(Clone, PartialEq)]
-pub struct RouteHop {
-       /// The node_id of the node at this hop.
-       pub pubkey: PublicKey,
-       /// The node_announcement features of the node at this hop. For the last hop, these may be
-       /// amended to match the features present in the invoice this node generated.
-       pub node_features: NodeFeatures,
-       /// The channel that should be used from the previous hop to reach this node.
-       pub short_channel_id: u64,
-       /// The channel_announcement features of the channel that should be used from the previous hop
-       /// to reach this node.
-       pub channel_features: ChannelFeatures,
-       /// The fee taken on this hop. For the last hop, this should be the full value of the payment.
-       pub fee_msat: u64,
-       /// The CLTV delta added for this hop. For the last hop, this should be the full CLTV value
-       /// expected at the destination, in excess of the current block height.
-       pub cltv_expiry_delta: u32,
-}
-
-impl Writeable for Vec<RouteHop> {
-       fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
-               (self.len() as u8).write(writer)?;
-               for hop in self.iter() {
-                       hop.pubkey.write(writer)?;
-                       hop.node_features.write(writer)?;
-                       hop.short_channel_id.write(writer)?;
-                       hop.channel_features.write(writer)?;
-                       hop.fee_msat.write(writer)?;
-                       hop.cltv_expiry_delta.write(writer)?;
-               }
-               Ok(())
-       }
-}
-
-impl Readable for Vec<RouteHop> {
-       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Vec<RouteHop>, DecodeError> {
-               let hops_count: u8 = Readable::read(reader)?;
-               let mut hops = Vec::with_capacity(hops_count as usize);
-               for _ in 0..hops_count {
-                       hops.push(RouteHop {
-                               pubkey: Readable::read(reader)?,
-                               node_features: Readable::read(reader)?,
-                               short_channel_id: Readable::read(reader)?,
-                               channel_features: Readable::read(reader)?,
-                               fee_msat: Readable::read(reader)?,
-                               cltv_expiry_delta: Readable::read(reader)?,
-                       });
-               }
-               Ok(hops)
-       }
-}
-
-/// A route directs a payment from the sender (us) to the recipient. If the recipient supports MPP,
-/// it can take multiple paths. Each path is composed of one or more hops through the network.
-#[derive(Clone, PartialEq)]
-pub struct Route {
-       /// The list of routes taken for a single (potentially-)multi-part payment. The pubkey of the
-       /// last RouteHop in each path must be the same.
-       /// Each entry represents a list of hops, NOT INCLUDING our own, where the last hop is the
-       /// destination. Thus, this must always be at least length one. While the maximum length of any
-       /// given path is variable, keeping the length of any path to less than 20 should currently
-       /// ensure it is viable.
-       pub paths: Vec<Vec<RouteHop>>,
-}
-
-impl Writeable for Route {
-       fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
-               (self.paths.len() as u64).write(writer)?;
-               for hops in self.paths.iter() {
-                       hops.write(writer)?;
-               }
-               Ok(())
-       }
-}
-
-impl Readable for Route {
-       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Route, DecodeError> {
-               let path_count: u64 = Readable::read(reader)?;
-               let mut paths = Vec::with_capacity(cmp::min(path_count, 128) as usize);
-               for _ in 0..path_count {
-                       paths.push(Readable::read(reader)?);
-               }
-               Ok(Route { paths })
-       }
-}
-
-#[derive(PartialEq)]
-struct DirectionalChannelInfo {
-       src_node_id: PublicKey,
-       last_update: u32,
-       enabled: bool,
-       cltv_expiry_delta: u16,
-       htlc_minimum_msat: u64,
-       fee_base_msat: u32,
-       fee_proportional_millionths: u32,
-       last_update_message: Option<msgs::ChannelUpdate>,
-}
-
-impl std::fmt::Display for DirectionalChannelInfo {
-       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
-               write!(f, "src_node_id {}, last_update {}, enabled {}, cltv_expiry_delta {}, htlc_minimum_msat {}, fee_base_msat {}, fee_proportional_millionths {}", log_pubkey!(self.src_node_id), self.last_update, self.enabled, self.cltv_expiry_delta, self.htlc_minimum_msat, self.fee_base_msat, self.fee_proportional_millionths)?;
-               Ok(())
-       }
-}
-
-impl_writeable!(DirectionalChannelInfo, 0, {
-       src_node_id,
-       last_update,
-       enabled,
-       cltv_expiry_delta,
-       htlc_minimum_msat,
-       fee_base_msat,
-       fee_proportional_millionths,
-       last_update_message
-});
-
-#[derive(PartialEq)]
-struct ChannelInfo {
-       features: ChannelFeatures,
-       one_to_two: DirectionalChannelInfo,
-       two_to_one: DirectionalChannelInfo,
-       //this is cached here so we can send out it later if required by route_init_sync
-       //keep an eye on this to see if the extra memory is a problem
-       announcement_message: Option<msgs::ChannelAnnouncement>,
-}
-
-impl std::fmt::Display for ChannelInfo {
-       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
-               write!(f, "features: {}, one_to_two: {}, two_to_one: {}", log_bytes!(self.features.encode()), self.one_to_two, self.two_to_one)?;
-               Ok(())
-       }
-}
-
-impl_writeable!(ChannelInfo, 0, {
-       features,
-       one_to_two,
-       two_to_one,
-       announcement_message
-});
-
-#[derive(PartialEq)]
-struct NodeInfo {
-       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
-       channels: Vec<(u64, Sha256dHash)>,
-       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
-       channels: Vec<u64>,
-
-       lowest_inbound_channel_fee_base_msat: u32,
-       lowest_inbound_channel_fee_proportional_millionths: u32,
-
-       features: NodeFeatures,
-       /// Unlike for channels, we may have a NodeInfo entry before having received a node_update.
-       /// Thus, we have to be able to capture "no update has been received", which we do with an
-       /// Option here.
-       last_update: Option<u32>,
-       rgb: [u8; 3],
-       alias: [u8; 32],
-       addresses: Vec<NetAddress>,
-       //this is cached here so we can send out it later if required by route_init_sync
-       //keep an eye on this to see if the extra memory is a problem
-       announcement_message: Option<msgs::NodeAnnouncement>,
-}
-
-impl std::fmt::Display for NodeInfo {
-       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
-               write!(f, "features: {}, last_update: {:?}, lowest_inbound_channel_fee_base_msat: {}, lowest_inbound_channel_fee_proportional_millionths: {}, channels: {:?}", log_bytes!(self.features.encode()), self.last_update, self.lowest_inbound_channel_fee_base_msat, self.lowest_inbound_channel_fee_proportional_millionths, &self.channels[..])?;
-               Ok(())
-       }
-}
-
-impl Writeable for NodeInfo {
-       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
-               (self.channels.len() as u64).write(writer)?;
-               for ref chan in self.channels.iter() {
-                       chan.write(writer)?;
-               }
-               self.lowest_inbound_channel_fee_base_msat.write(writer)?;
-               self.lowest_inbound_channel_fee_proportional_millionths.write(writer)?;
-               self.features.write(writer)?;
-               self.last_update.write(writer)?;
-               self.rgb.write(writer)?;
-               self.alias.write(writer)?;
-               (self.addresses.len() as u64).write(writer)?;
-               for ref addr in &self.addresses {
-                       addr.write(writer)?;
-               }
-               self.announcement_message.write(writer)?;
-               Ok(())
-       }
-}
-
-const MAX_ALLOC_SIZE: u64 = 64*1024;
-
-impl Readable for NodeInfo {
-       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<NodeInfo, DecodeError> {
-               let channels_count: u64 = Readable::read(reader)?;
-               let mut channels = Vec::with_capacity(cmp::min(channels_count, MAX_ALLOC_SIZE / 8) as usize);
-               for _ in 0..channels_count {
-                       channels.push(Readable::read(reader)?);
-               }
-               let lowest_inbound_channel_fee_base_msat = Readable::read(reader)?;
-               let lowest_inbound_channel_fee_proportional_millionths = Readable::read(reader)?;
-               let features = Readable::read(reader)?;
-               let last_update = Readable::read(reader)?;
-               let rgb = Readable::read(reader)?;
-               let alias = Readable::read(reader)?;
-               let addresses_count: u64 = Readable::read(reader)?;
-               let mut addresses = Vec::with_capacity(cmp::min(addresses_count, MAX_ALLOC_SIZE / 40) as usize);
-               for _ in 0..addresses_count {
-                       match Readable::read(reader) {
-                               Ok(Ok(addr)) => { addresses.push(addr); },
-                               Ok(Err(_)) => return Err(DecodeError::InvalidValue),
-                               Err(DecodeError::ShortRead) => return Err(DecodeError::BadLengthDescriptor),
-                               _ => unreachable!(),
-                       }
-               }
-               let announcement_message = Readable::read(reader)?;
-               Ok(NodeInfo {
-                       channels,
-                       lowest_inbound_channel_fee_base_msat,
-                       lowest_inbound_channel_fee_proportional_millionths,
-                       features,
-                       last_update,
-                       rgb,
-                       alias,
-                       addresses,
-                       announcement_message
-               })
-       }
-}
-
-#[derive(PartialEq)]
-struct NetworkMap {
-       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
-       channels: BTreeMap<(u64, Sha256dHash), ChannelInfo>,
-       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
-       channels: BTreeMap<u64, ChannelInfo>,
-
-       our_node_id: PublicKey,
-       nodes: BTreeMap<PublicKey, NodeInfo>,
-}
-
-impl Writeable for NetworkMap {
-       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
-               (self.channels.len() as u64).write(writer)?;
-               for (ref chan_id, ref chan_info) in self.channels.iter() {
-                       (*chan_id).write(writer)?;
-                       chan_info.write(writer)?;
-               }
-               self.our_node_id.write(writer)?;
-               (self.nodes.len() as u64).write(writer)?;
-               for (ref node_id, ref node_info) in self.nodes.iter() {
-                       node_id.write(writer)?;
-                       node_info.write(writer)?;
-               }
-               Ok(())
-       }
-}
-
-impl Readable for NetworkMap {
-       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<NetworkMap, DecodeError> {
-               let channels_count: u64 = Readable::read(reader)?;
-               let mut channels = BTreeMap::new();
-               for _ in 0..channels_count {
-                       let chan_id: u64 = Readable::read(reader)?;
-                       let chan_info = Readable::read(reader)?;
-                       channels.insert(chan_id, chan_info);
-               }
-               let our_node_id = Readable::read(reader)?;
-               let nodes_count: u64 = Readable::read(reader)?;
-               let mut nodes = BTreeMap::new();
-               for _ in 0..nodes_count {
-                       let node_id = Readable::read(reader)?;
-                       let node_info = Readable::read(reader)?;
-                       nodes.insert(node_id, node_info);
-               }
-               Ok(NetworkMap {
-                       channels,
-                       our_node_id,
-                       nodes,
-               })
-       }
-}
-
-impl std::fmt::Display for NetworkMap {
-       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
-               write!(f, "Node id {} network map\n[Channels]\n", log_pubkey!(self.our_node_id))?;
-               for (key, val) in self.channels.iter() {
-                       write!(f, " {}: {}\n", key, val)?;
-               }
-               write!(f, "[Nodes]\n")?;
-               for (key, val) in self.nodes.iter() {
-                       write!(f, " {}: {}\n", log_pubkey!(key), val)?;
-               }
-               Ok(())
-       }
-}
-
-impl NetworkMap {
-       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
-       #[inline]
-       fn get_key(short_channel_id: u64, chain_hash: BlockHash) -> (u64, BlockHash) {
-               (short_channel_id, chain_hash)
-       }
-
-       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
-       #[inline]
-       fn get_key(short_channel_id: u64, _: BlockHash) -> u64 {
-               short_channel_id
-       }
-
-       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
-       #[inline]
-       fn get_short_id(id: &(u64, BlockHash)) -> &u64 {
-               &id.0
-       }
-
-       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
-       #[inline]
-       fn get_short_id(id: &u64) -> &u64 {
-               id
-       }
-}
-
-/// A channel descriptor which provides a last-hop route to get_route
-pub struct RouteHint {
-       /// The node_id of the non-target end of the route
-       pub src_node_id: PublicKey,
-       /// The short_channel_id of this channel
-       pub short_channel_id: u64,
-       /// The static msat-denominated fee which must be paid to use this channel
-       pub fee_base_msat: u32,
-       /// The dynamic proportional fee which must be paid to use this channel, denominated in
-       /// millionths of the value being forwarded to the next hop.
-       pub fee_proportional_millionths: u32,
-       /// The difference in CLTV values between this node and the next node.
-       pub cltv_expiry_delta: u16,
-       /// The minimum value, in msat, which must be relayed to the next hop.
-       pub htlc_minimum_msat: u64,
-}
-
-/// Tracks a view of the network, receiving updates from peers and generating Routes to
-/// payment destinations.
-pub struct Router {
-       secp_ctx: Secp256k1<secp256k1::VerifyOnly>,
-       network_map: RwLock<NetworkMap>,
-       full_syncs_requested: AtomicUsize,
-       chain_monitor: Arc<ChainWatchInterface>,
-       logger: Arc<Logger>,
-}
-
-const SERIALIZATION_VERSION: u8 = 1;
-const MIN_SERIALIZATION_VERSION: u8 = 1;
-
-impl Writeable for Router {
-       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
-               writer.write_all(&[SERIALIZATION_VERSION; 1])?;
-               writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
-
-               let network = self.network_map.read().unwrap();
-               network.write(writer)?;
-               Ok(())
-       }
-}
-
-/// Arguments for the creation of a Router that are not deserialized.
-/// At a high-level, the process for deserializing a Router and resuming normal operation is:
-/// 1) Deserialize the Router by filling in this struct and calling <Router>::read(reaser, args).
-/// 2) Register the new Router with your ChainWatchInterface
-pub struct RouterReadArgs {
-       /// The ChainWatchInterface for use in the Router in the future.
-       ///
-       /// No calls to the ChainWatchInterface will be made during deserialization.
-       pub chain_monitor: Arc<ChainWatchInterface>,
-       /// The Logger for use in the ChannelManager and which may be used to log information during
-       /// deserialization.
-       pub logger: Arc<Logger>,
-}
-
-impl ReadableArgs<RouterReadArgs> for Router {
-       fn read<R: ::std::io::Read>(reader: &mut R, args: RouterReadArgs) -> Result<Router, DecodeError> {
-               let _ver: u8 = Readable::read(reader)?;
-               let min_ver: u8 = Readable::read(reader)?;
-               if min_ver > SERIALIZATION_VERSION {
-                       return Err(DecodeError::UnknownVersion);
-               }
-               let network_map = Readable::read(reader)?;
-               Ok(Router {
-                       secp_ctx: Secp256k1::verification_only(),
-                       network_map: RwLock::new(network_map),
-                       full_syncs_requested: AtomicUsize::new(0),
-                       chain_monitor: args.chain_monitor,
-                       logger: args.logger,
-               })
-       }
-}
-
-macro_rules! secp_verify_sig {
-       ( $secp_ctx: expr, $msg: expr, $sig: expr, $pubkey: expr ) => {
-               match $secp_ctx.verify($msg, $sig, $pubkey) {
-                       Ok(_) => {},
-                       Err(_) => return Err(LightningError{err: "Invalid signature from remote node", action: ErrorAction::IgnoreError}),
-               }
-       };
-}
-
-impl RoutingMessageHandler for Router {
-
-       fn handle_node_announcement(&self, msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> {
-               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
-               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &msg.contents.node_id);
-
-               let mut network = self.network_map.write().unwrap();
-               match network.nodes.get_mut(&msg.contents.node_id) {
-                       None => Err(LightningError{err: "No existing channels for node_announcement", action: ErrorAction::IgnoreError}),
-                       Some(node) => {
-                               match node.last_update {
-                                       Some(last_update) => if last_update >= msg.contents.timestamp {
-                                               return Err(LightningError{err: "Update older than last processed update", action: ErrorAction::IgnoreError});
-                                       },
-                                       None => {},
-                               }
-
-                               node.features = msg.contents.features.clone();
-                               node.last_update = Some(msg.contents.timestamp);
-                               node.rgb = msg.contents.rgb;
-                               node.alias = msg.contents.alias;
-                               node.addresses = msg.contents.addresses.clone();
-
-                               let should_relay = msg.contents.excess_data.is_empty() && msg.contents.excess_address_data.is_empty();
-                               node.announcement_message = if should_relay { Some(msg.clone()) } else { None };
-                               Ok(should_relay)
-                       }
-               }
-       }
-
-       fn handle_channel_announcement(&self, msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> {
-               if msg.contents.node_id_1 == msg.contents.node_id_2 || msg.contents.bitcoin_key_1 == msg.contents.bitcoin_key_2 {
-                       return Err(LightningError{err: "Channel announcement node had a channel with itself", action: ErrorAction::IgnoreError});
-               }
-
-               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
-               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_1, &msg.contents.node_id_1);
-               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_2, &msg.contents.node_id_2);
-               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_1, &msg.contents.bitcoin_key_1);
-               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_2, &msg.contents.bitcoin_key_2);
-
-               let checked_utxo = match self.chain_monitor.get_chain_utxo(msg.contents.chain_hash, msg.contents.short_channel_id) {
-                       Ok((script_pubkey, _value)) => {
-                               let expected_script = Builder::new().push_opcode(opcodes::all::OP_PUSHNUM_2)
-                                                                   .push_slice(&msg.contents.bitcoin_key_1.serialize())
-                                                                   .push_slice(&msg.contents.bitcoin_key_2.serialize())
-                                                                   .push_opcode(opcodes::all::OP_PUSHNUM_2)
-                                                                   .push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script().to_v0_p2wsh();
-                               if script_pubkey != expected_script {
-                                       return Err(LightningError{err: "Channel announcement keys didn't match on-chain script", action: ErrorAction::IgnoreError});
-                               }
-                               //TODO: Check if value is worth storing, use it to inform routing, and compare it
-                               //to the new HTLC max field in channel_update
-                               true
-                       },
-                       Err(ChainError::NotSupported) => {
-                               // Tentatively accept, potentially exposing us to DoS attacks
-                               false
-                       },
-                       Err(ChainError::NotWatched) => {
-                               return Err(LightningError{err: "Channel announced on an unknown chain", action: ErrorAction::IgnoreError});
-                       },
-                       Err(ChainError::UnknownTx) => {
-                               return Err(LightningError{err: "Channel announced without corresponding UTXO entry", action: ErrorAction::IgnoreError});
-                       },
-               };
-
-               let mut network_lock = self.network_map.write().unwrap();
-               let network = &mut *network_lock;
-
-               let should_relay = msg.contents.excess_data.is_empty();
-
-               let chan_info = ChannelInfo {
-                               features: msg.contents.features.clone(),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: msg.contents.node_id_1.clone(),
-                                       last_update: 0,
-                                       enabled: false,
-                                       cltv_expiry_delta: u16::max_value(),
-                                       htlc_minimum_msat: u64::max_value(),
-                                       fee_base_msat: u32::max_value(),
-                                       fee_proportional_millionths: u32::max_value(),
-                                       last_update_message: None,
-                               },
-                               two_to_one: DirectionalChannelInfo {
-                                       src_node_id: msg.contents.node_id_2.clone(),
-                                       last_update: 0,
-                                       enabled: false,
-                                       cltv_expiry_delta: u16::max_value(),
-                                       htlc_minimum_msat: u64::max_value(),
-                                       fee_base_msat: u32::max_value(),
-                                       fee_proportional_millionths: u32::max_value(),
-                                       last_update_message: None,
-                               },
-                               announcement_message: if should_relay { Some(msg.clone()) } else { None },
-                       };
-
-               match network.channels.entry(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
-                       BtreeEntry::Occupied(mut entry) => {
-                               //TODO: because asking the blockchain if short_channel_id is valid is only optional
-                               //in the blockchain API, we need to handle it smartly here, though it's unclear
-                               //exactly how...
-                               if checked_utxo {
-                                       // Either our UTXO provider is busted, there was a reorg, or the UTXO provider
-                                       // only sometimes returns results. In any case remove the previous entry. Note
-                                       // that the spec expects us to "blacklist" the node_ids involved, but we can't
-                                       // do that because
-                                       // a) we don't *require* a UTXO provider that always returns results.
-                                       // b) we don't track UTXOs of channels we know about and remove them if they
-                                       //    get reorg'd out.
-                                       // c) it's unclear how to do so without exposing ourselves to massive DoS risk.
-                                       Self::remove_channel_in_nodes(&mut network.nodes, &entry.get(), msg.contents.short_channel_id);
-                                       *entry.get_mut() = chan_info;
-                               } else {
-                                       return Err(LightningError{err: "Already have knowledge of channel", action: ErrorAction::IgnoreError})
-                               }
-                       },
-                       BtreeEntry::Vacant(entry) => {
-                               entry.insert(chan_info);
-                       }
-               };
-
-               macro_rules! add_channel_to_node {
-                       ( $node_id: expr ) => {
-                               match network.nodes.entry($node_id) {
-                                       BtreeEntry::Occupied(node_entry) => {
-                                               node_entry.into_mut().channels.push(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash));
-                                       },
-                                       BtreeEntry::Vacant(node_entry) => {
-                                               node_entry.insert(NodeInfo {
-                                                       channels: vec!(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)),
-                                                       lowest_inbound_channel_fee_base_msat: u32::max_value(),
-                                                       lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
-                                                       features: NodeFeatures::empty(),
-                                                       last_update: None,
-                                                       rgb: [0; 3],
-                                                       alias: [0; 32],
-                                                       addresses: Vec::new(),
-                                                       announcement_message: None,
-                                               });
-                                       }
-                               }
-                       };
-               }
-
-               add_channel_to_node!(msg.contents.node_id_1);
-               add_channel_to_node!(msg.contents.node_id_2);
-
-               log_trace!(self, "Added channel_announcement for {}{}", msg.contents.short_channel_id, if !should_relay { " with excess uninterpreted data!" } else { "" });
-               Ok(should_relay)
-       }
-
-       fn handle_htlc_fail_channel_update(&self, update: &msgs::HTLCFailChannelUpdate) {
-               match update {
-                       &msgs::HTLCFailChannelUpdate::ChannelUpdateMessage { ref msg } => {
-                               let _ = self.handle_channel_update(msg);
-                       },
-                       &msgs::HTLCFailChannelUpdate::ChannelClosed { ref short_channel_id, ref is_permanent } => {
-                               let mut network = self.network_map.write().unwrap();
-                               if *is_permanent {
-                                       if let Some(chan) = network.channels.remove(short_channel_id) {
-                                               Self::remove_channel_in_nodes(&mut network.nodes, &chan, *short_channel_id);
-                                       }
-                               } else {
-                                       if let Some(chan) = network.channels.get_mut(short_channel_id) {
-                                               chan.one_to_two.enabled = false;
-                                               chan.two_to_one.enabled = false;
-                                       }
-                               }
-                       },
-                       &msgs::HTLCFailChannelUpdate::NodeFailure { ref node_id, ref is_permanent } => {
-                               if *is_permanent {
-                                       //TODO: Wholly remove the node
-                               } else {
-                                       self.mark_node_bad(node_id, false);
-                               }
-                       },
-               }
-       }
-
-       fn handle_channel_update(&self, msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> {
-               let mut network = self.network_map.write().unwrap();
-               let dest_node_id;
-               let chan_enabled = msg.contents.flags & (1 << 1) != (1 << 1);
-               let chan_was_enabled;
-
-               match network.channels.get_mut(&NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
-                       None => return Err(LightningError{err: "Couldn't find channel for update", action: ErrorAction::IgnoreError}),
-                       Some(channel) => {
-                               macro_rules! maybe_update_channel_info {
-                                       ( $target: expr) => {
-                                               if $target.last_update >= msg.contents.timestamp {
-                                                       return Err(LightningError{err: "Update older than last processed update", action: ErrorAction::IgnoreError});
-                                               }
-                                               chan_was_enabled = $target.enabled;
-                                               $target.last_update = msg.contents.timestamp;
-                                               $target.enabled = chan_enabled;
-                                               $target.cltv_expiry_delta = msg.contents.cltv_expiry_delta;
-                                               $target.htlc_minimum_msat = msg.contents.htlc_minimum_msat;
-                                               $target.fee_base_msat = msg.contents.fee_base_msat;
-                                               $target.fee_proportional_millionths = msg.contents.fee_proportional_millionths;
-                                               $target.last_update_message = if msg.contents.excess_data.is_empty() {
-                                                       Some(msg.clone())
-                                               } else {
-                                                       None
-                                               };
-                                       }
-                               }
-                               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
-                               if msg.contents.flags & 1 == 1 {
-                                       dest_node_id = channel.one_to_two.src_node_id.clone();
-                                       secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.two_to_one.src_node_id);
-                                       maybe_update_channel_info!(channel.two_to_one);
-                               } else {
-                                       dest_node_id = channel.two_to_one.src_node_id.clone();
-                                       secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.one_to_two.src_node_id);
-                                       maybe_update_channel_info!(channel.one_to_two);
-                               }
-                       }
-               }
-
-               if chan_enabled {
-                       let node = network.nodes.get_mut(&dest_node_id).unwrap();
-                       node.lowest_inbound_channel_fee_base_msat = cmp::min(node.lowest_inbound_channel_fee_base_msat, msg.contents.fee_base_msat);
-                       node.lowest_inbound_channel_fee_proportional_millionths = cmp::min(node.lowest_inbound_channel_fee_proportional_millionths, msg.contents.fee_proportional_millionths);
-               } else if chan_was_enabled {
-                       let mut lowest_inbound_channel_fee_base_msat = u32::max_value();
-                       let mut lowest_inbound_channel_fee_proportional_millionths = u32::max_value();
-
-                       {
-                               let node = network.nodes.get(&dest_node_id).unwrap();
-
-                               for chan_id in node.channels.iter() {
-                                       let chan = network.channels.get(chan_id).unwrap();
-                                       if chan.one_to_two.src_node_id == dest_node_id {
-                                               lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.two_to_one.fee_base_msat);
-                                               lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.two_to_one.fee_proportional_millionths);
-                                       } else {
-                                               lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.one_to_two.fee_base_msat);
-                                               lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.one_to_two.fee_proportional_millionths);
-                                       }
-                               }
-                       }
-
-                       //TODO: satisfy the borrow-checker without a double-map-lookup :(
-                       let mut_node = network.nodes.get_mut(&dest_node_id).unwrap();
-                       mut_node.lowest_inbound_channel_fee_base_msat = lowest_inbound_channel_fee_base_msat;
-                       mut_node.lowest_inbound_channel_fee_proportional_millionths = lowest_inbound_channel_fee_proportional_millionths;
-               }
-
-               Ok(msg.contents.excess_data.is_empty())
-       }
-
-       fn get_next_channel_announcements(&self, starting_point: u64, batch_amount: u8) -> Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> {
-               let mut result = Vec::with_capacity(batch_amount as usize);
-               let network = self.network_map.read().unwrap();
-               let mut iter = network.channels.range(starting_point..);
-               while result.len() < batch_amount as usize {
-                       if let Some((_, ref chan)) = iter.next() {
-                               if chan.announcement_message.is_some() {
-                                       result.push((chan.announcement_message.clone().unwrap(),
-                                               chan.one_to_two.last_update_message.clone(),
-                                               chan.two_to_one.last_update_message.clone()));
-                               } else {
-                                       // TODO: We may end up sending un-announced channel_updates if we are sending
-                                       // initial sync data while receiving announce/updates for this channel.
-                               }
-                       } else {
-                               return result;
-                       }
-               }
-               result
-       }
-
-       fn get_next_node_announcements(&self, starting_point: Option<&PublicKey>, batch_amount: u8) -> Vec<msgs::NodeAnnouncement> {
-               let mut result = Vec::with_capacity(batch_amount as usize);
-               let network = self.network_map.read().unwrap();
-               let mut iter = if let Some(pubkey) = starting_point {
-                               let mut iter = network.nodes.range((*pubkey)..);
-                               iter.next();
-                               iter
-                       } else {
-                               network.nodes.range(..)
-                       };
-               while result.len() < batch_amount as usize {
-                       if let Some((_, ref node)) = iter.next() {
-                               if node.announcement_message.is_some() {
-                                       result.push(node.announcement_message.clone().unwrap());
-                               }
-                       } else {
-                               return result;
-                       }
-               }
-               result
-       }
-
-       fn should_request_full_sync(&self, _node_id: &PublicKey) -> bool {
-               //TODO: Determine whether to request a full sync based on the network map.
-               const FULL_SYNCS_TO_REQUEST: usize = 5;
-               if self.full_syncs_requested.load(Ordering::Acquire) < FULL_SYNCS_TO_REQUEST {
-                       self.full_syncs_requested.fetch_add(1, Ordering::AcqRel);
-                       true
-               } else {
-                       false
-               }
-       }
-}
-
-#[derive(Eq, PartialEq)]
-struct RouteGraphNode {
-       pubkey: PublicKey,
-       lowest_fee_to_peer_through_node: u64,
-       lowest_fee_to_node: u64,
-}
-
-impl cmp::Ord for RouteGraphNode {
-       fn cmp(&self, other: &RouteGraphNode) -> cmp::Ordering {
-               other.lowest_fee_to_peer_through_node.cmp(&self.lowest_fee_to_peer_through_node)
-                       .then_with(|| other.pubkey.serialize().cmp(&self.pubkey.serialize()))
-       }
-}
-
-impl cmp::PartialOrd for RouteGraphNode {
-       fn partial_cmp(&self, other: &RouteGraphNode) -> Option<cmp::Ordering> {
-               Some(self.cmp(other))
-       }
-}
-
-struct DummyDirectionalChannelInfo {
-       src_node_id: PublicKey,
-       cltv_expiry_delta: u32,
-       htlc_minimum_msat: u64,
-       fee_base_msat: u32,
-       fee_proportional_millionths: u32,
-}
-
-impl Router {
-       /// Creates a new router with the given node_id to be used as the source for get_route()
-       pub fn new(our_pubkey: PublicKey, chain_monitor: Arc<ChainWatchInterface>, logger: Arc<Logger>) -> Router {
-               let mut nodes = BTreeMap::new();
-               nodes.insert(our_pubkey.clone(), NodeInfo {
-                       channels: Vec::new(),
-                       lowest_inbound_channel_fee_base_msat: u32::max_value(),
-                       lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
-                       features: NodeFeatures::empty(),
-                       last_update: None,
-                       rgb: [0; 3],
-                       alias: [0; 32],
-                       addresses: Vec::new(),
-                       announcement_message: None,
-               });
-               Router {
-                       secp_ctx: Secp256k1::verification_only(),
-                       network_map: RwLock::new(NetworkMap {
-                               channels: BTreeMap::new(),
-                               our_node_id: our_pubkey,
-                               nodes: nodes,
-                       }),
-                       full_syncs_requested: AtomicUsize::new(0),
-                       chain_monitor,
-                       logger,
-               }
-       }
-
-       /// Dumps the entire network view of this Router to the logger provided in the constructor at
-       /// level Trace
-       pub fn trace_state(&self) {
-               log_trace!(self, "{}", self.network_map.read().unwrap());
-       }
-
-       /// Get network addresses by node id
-       pub fn get_addresses(&self, pubkey: &PublicKey) -> Option<Vec<NetAddress>> {
-               let network = self.network_map.read().unwrap();
-               network.nodes.get(pubkey).map(|n| n.addresses.clone())
-       }
-
-       /// Marks a node as having failed a route. This will avoid re-using the node in routes for now,
-       /// with an exponential decay in node "badness". Note that there is deliberately no
-       /// mark_channel_bad as a node may simply lie and suggest that an upstream channel from it is
-       /// what failed the route and not the node itself. Instead, setting the blamed_upstream_node
-       /// boolean will reduce the penalty, returning the node to usability faster. If the node is
-       /// behaving correctly, it will disable the failing channel and we will use it again next time.
-       pub fn mark_node_bad(&self, _node_id: &PublicKey, _blamed_upstream_node: bool) {
-               unimplemented!();
-       }
-
-       fn remove_channel_in_nodes(nodes: &mut BTreeMap<PublicKey, NodeInfo>, chan: &ChannelInfo, short_channel_id: u64) {
-               macro_rules! remove_from_node {
-                       ($node_id: expr) => {
-                               if let BtreeEntry::Occupied(mut entry) = nodes.entry($node_id) {
-                                       entry.get_mut().channels.retain(|chan_id| {
-                                               short_channel_id != *NetworkMap::get_short_id(chan_id)
-                                       });
-                                       if entry.get().channels.is_empty() {
-                                               entry.remove_entry();
-                                       }
-                               } else {
-                                       panic!("Had channel that pointed to unknown node (ie inconsistent network map)!");
-                               }
-                       }
-               }
-               remove_from_node!(chan.one_to_two.src_node_id);
-               remove_from_node!(chan.two_to_one.src_node_id);
-       }
-
-       /// Gets a route from us to the given target node.
-       ///
-       /// Extra routing hops between known nodes and the target will be used if they are included in
-       /// last_hops.
-       ///
-       /// If some channels aren't announced, it may be useful to fill in a first_hops with the
-       /// results from a local ChannelManager::list_usable_channels() call. If it is filled in, our
-       /// (this Router's) view of our local channels will be ignored, and only those in first_hops
-       /// will be used.
-       ///
-       /// Panics if first_hops contains channels without short_channel_ids
-       /// (ChannelManager::list_usable_channels will never include such channels).
-       ///
-       /// The fees on channels from us to next-hops are ignored (as they are assumed to all be
-       /// equal), however the enabled/disabled bit on such channels as well as the htlc_minimum_msat
-       /// *is* checked as they may change based on the receiving node.
-       pub fn get_route(&self, target: &PublicKey, first_hops: Option<&[channelmanager::ChannelDetails]>, last_hops: &[RouteHint], final_value_msat: u64, final_cltv: u32) -> Result<Route, LightningError> {
-               // TODO: Obviously *only* using total fee cost sucks. We should consider weighting by
-               // uptime/success in using a node in the past.
-               let network = self.network_map.read().unwrap();
-
-               if *target == network.our_node_id {
-                       return Err(LightningError{err: "Cannot generate a route to ourselves", action: ErrorAction::IgnoreError});
-               }
-
-               if final_value_msat > 21_000_000 * 1_0000_0000 * 1000 {
-                       return Err(LightningError{err: "Cannot generate a route of more value than all existing satoshis", action: ErrorAction::IgnoreError});
-               }
-
-               // We do a dest-to-source Dijkstra's sorting by each node's distance from the destination
-               // plus the minimum per-HTLC fee to get from it to another node (aka "shitty A*").
-               // TODO: There are a few tweaks we could do, including possibly pre-calculating more stuff
-               // to use as the A* heuristic beyond just the cost to get one node further than the current
-               // one.
-
-               let dummy_directional_info = DummyDirectionalChannelInfo { // used for first_hops routes
-                       src_node_id: network.our_node_id.clone(),
-                       cltv_expiry_delta: 0,
-                       htlc_minimum_msat: 0,
-                       fee_base_msat: 0,
-                       fee_proportional_millionths: 0,
-               };
-
-               let mut targets = BinaryHeap::new(); //TODO: Do we care about switching to eg Fibbonaci heap?
-               let mut dist = HashMap::with_capacity(network.nodes.len());
-
-               let mut first_hop_targets = HashMap::with_capacity(if first_hops.is_some() { first_hops.as_ref().unwrap().len() } else { 0 });
-               if let Some(hops) = first_hops {
-                       for chan in hops {
-                               let short_channel_id = chan.short_channel_id.expect("first_hops should be filled in with usable channels, not pending ones");
-                               if chan.remote_network_id == *target {
-                                       return Ok(Route {
-                                               paths: vec![vec![RouteHop {
-                                                       pubkey: chan.remote_network_id,
-                                                       node_features: chan.counterparty_features.to_context(),
-                                                       short_channel_id,
-                                                       channel_features: chan.counterparty_features.to_context(),
-                                                       fee_msat: final_value_msat,
-                                                       cltv_expiry_delta: final_cltv,
-                                               }]],
-                                       });
-                               }
-                               first_hop_targets.insert(chan.remote_network_id, (short_channel_id, chan.counterparty_features.clone()));
-                       }
-                       if first_hop_targets.is_empty() {
-                               return Err(LightningError{err: "Cannot route when there are no outbound routes away from us", action: ErrorAction::IgnoreError});
-                       }
-               }
-
-               macro_rules! add_entry {
-                       // Adds entry which goes from the node pointed to by $directional_info to
-                       // $dest_node_id over the channel with id $chan_id with fees described in
-                       // $directional_info.
-                       ( $chan_id: expr, $dest_node_id: expr, $directional_info: expr, $chan_features: expr, $starting_fee_msat: expr ) => {
-                               //TODO: Explore simply adding fee to hit htlc_minimum_msat
-                               if $starting_fee_msat as u64 + final_value_msat >= $directional_info.htlc_minimum_msat {
-                                       let proportional_fee_millions = ($starting_fee_msat + final_value_msat).checked_mul($directional_info.fee_proportional_millionths as u64);
-                                       if let Some(new_fee) = proportional_fee_millions.and_then(|part| {
-                                                       ($directional_info.fee_base_msat as u64).checked_add(part / 1000000) })
-                                       {
-                                               let mut total_fee = $starting_fee_msat as u64;
-                                               let hm_entry = dist.entry(&$directional_info.src_node_id);
-                                               let old_entry = hm_entry.or_insert_with(|| {
-                                                       let node = network.nodes.get(&$directional_info.src_node_id).unwrap();
-                                                       (u64::max_value(),
-                                                               node.lowest_inbound_channel_fee_base_msat,
-                                                               node.lowest_inbound_channel_fee_proportional_millionths,
-                                                               RouteHop {
-                                                                       pubkey: $dest_node_id.clone(),
-                                                                       node_features: NodeFeatures::empty(),
-                                                                       short_channel_id: 0,
-                                                                       channel_features: $chan_features.clone(),
-                                                                       fee_msat: 0,
-                                                                       cltv_expiry_delta: 0,
-                                                       })
-                                               });
-                                               if $directional_info.src_node_id != network.our_node_id {
-                                                       // Ignore new_fee for channel-from-us as we assume all channels-from-us
-                                                       // will have the same effective-fee
-                                                       total_fee += new_fee;
-                                                       if let Some(fee_inc) = final_value_msat.checked_add(total_fee).and_then(|inc| { (old_entry.2 as u64).checked_mul(inc) }) {
-                                                               total_fee += fee_inc / 1000000 + (old_entry.1 as u64);
-                                                       } else {
-                                                               // max_value means we'll always fail the old_entry.0 > total_fee check
-                                                               total_fee = u64::max_value();
-                                                       }
-                                               }
-                                               let new_graph_node = RouteGraphNode {
-                                                       pubkey: $directional_info.src_node_id,
-                                                       lowest_fee_to_peer_through_node: total_fee,
-                                                       lowest_fee_to_node: $starting_fee_msat as u64 + new_fee,
-                                               };
-                                               if old_entry.0 > total_fee {
-                                                       targets.push(new_graph_node);
-                                                       old_entry.0 = total_fee;
-                                                       old_entry.3 = RouteHop {
-                                                               pubkey: $dest_node_id.clone(),
-                                                               node_features: NodeFeatures::empty(),
-                                                               short_channel_id: $chan_id.clone(),
-                                                               channel_features: $chan_features.clone(),
-                                                               fee_msat: new_fee, // This field is ignored on the last-hop anyway
-                                                               cltv_expiry_delta: $directional_info.cltv_expiry_delta as u32,
-                                                       }
-                                               }
-                                       }
-                               }
-                       };
-               }
-
-               macro_rules! add_entries_to_cheapest_to_target_node {
-                       ( $node: expr, $node_id: expr, $fee_to_target_msat: expr ) => {
-                               if first_hops.is_some() {
-                                       if let Some(&(ref first_hop, ref features)) = first_hop_targets.get(&$node_id) {
-                                               add_entry!(first_hop, $node_id, dummy_directional_info, features.to_context(), $fee_to_target_msat);
-                                       }
-                               }
-
-                               if !$node.features.requires_unknown_bits() {
-                                       for chan_id in $node.channels.iter() {
-                                               let chan = network.channels.get(chan_id).unwrap();
-                                               if !chan.features.requires_unknown_bits() {
-                                                       if chan.one_to_two.src_node_id == *$node_id {
-                                                               // ie $node is one, ie next hop in A* is two, via the two_to_one channel
-                                                               if first_hops.is_none() || chan.two_to_one.src_node_id != network.our_node_id {
-                                                                       if chan.two_to_one.enabled {
-                                                                               add_entry!(chan_id, chan.one_to_two.src_node_id, chan.two_to_one, chan.features, $fee_to_target_msat);
-                                                                       }
-                                                               }
-                                                       } else {
-                                                               if first_hops.is_none() || chan.one_to_two.src_node_id != network.our_node_id {
-                                                                       if chan.one_to_two.enabled {
-                                                                               add_entry!(chan_id, chan.two_to_one.src_node_id, chan.one_to_two, chan.features, $fee_to_target_msat);
-                                                                       }
-                                                               }
-                                                       }
-                                               }
-                                       }
-                               }
-                       };
-               }
-
-               match network.nodes.get(target) {
-                       None => {},
-                       Some(node) => {
-                               add_entries_to_cheapest_to_target_node!(node, target, 0);
-                       },
-               }
-
-               for hop in last_hops.iter() {
-                       if first_hops.is_none() || hop.src_node_id != network.our_node_id { // first_hop overrules last_hops
-                               if network.nodes.get(&hop.src_node_id).is_some() {
-                                       if first_hops.is_some() {
-                                               if let Some(&(ref first_hop, ref features)) = first_hop_targets.get(&hop.src_node_id) {
-                                                       // Currently there are no channel-context features defined, so we are a
-                                                       // bit lazy here. In the future, we should pull them out via our
-                                                       // ChannelManager, but there's no reason to waste the space until we
-                                                       // need them.
-                                                       add_entry!(first_hop, hop.src_node_id, dummy_directional_info, features.to_context(), 0);
-                                               }
-                                       }
-                                       // BOLT 11 doesn't allow inclusion of features for the last hop hints, which
-                                       // really sucks, cause we're gonna need that eventually.
-                                       add_entry!(hop.short_channel_id, target, hop, ChannelFeatures::empty(), 0);
-                               }
-                       }
-               }
-
-               while let Some(RouteGraphNode { pubkey, lowest_fee_to_node, .. }) = targets.pop() {
-                       if pubkey == network.our_node_id {
-                               let mut res = vec!(dist.remove(&network.our_node_id).unwrap().3);
-                               loop {
-                                       if let Some(&(_, ref features)) = first_hop_targets.get(&res.last().unwrap().pubkey) {
-                                               res.last_mut().unwrap().node_features = features.to_context();
-                                       } else if let Some(node) = network.nodes.get(&res.last().unwrap().pubkey) {
-                                               res.last_mut().unwrap().node_features = node.features.clone();
-                                       } else {
-                                               // We should be able to fill in features for everything except the last
-                                               // hop, if the last hop was provided via a BOLT 11 invoice (though we
-                                               // should be able to extend it further as BOLT 11 does have feature
-                                               // flags for the last hop node itself).
-                                               assert!(res.last().unwrap().pubkey == *target);
-                                       }
-                                       if res.last().unwrap().pubkey == *target {
-                                               break;
-                                       }
-
-                                       let new_entry = match dist.remove(&res.last().unwrap().pubkey) {
-                                               Some(hop) => hop.3,
-                                               None => return Err(LightningError{err: "Failed to find a non-fee-overflowing path to the given destination", action: ErrorAction::IgnoreError}),
-                                       };
-                                       res.last_mut().unwrap().fee_msat = new_entry.fee_msat;
-                                       res.last_mut().unwrap().cltv_expiry_delta = new_entry.cltv_expiry_delta;
-                                       res.push(new_entry);
-                               }
-                               res.last_mut().unwrap().fee_msat = final_value_msat;
-                               res.last_mut().unwrap().cltv_expiry_delta = final_cltv;
-                               let route = Route { paths: vec![res] };
-                               log_trace!(self, "Got route: {}", log_route!(route));
-                               return Ok(route);
-                       }
-
-                       match network.nodes.get(&pubkey) {
-                               None => {},
-                               Some(node) => {
-                                       add_entries_to_cheapest_to_target_node!(node, &pubkey, lowest_fee_to_node);
-                               },
-                       }
-               }
-
-               Err(LightningError{err: "Failed to find a path to the given destination", action: ErrorAction::IgnoreError})
-       }
-}
-
-#[cfg(test)]
-mod tests {
-       use chain::chaininterface;
-       use ln::channelmanager;
-       use ln::router::{Router,NodeInfo,NetworkMap,ChannelInfo,DirectionalChannelInfo,RouteHint};
-       use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
-       use ln::msgs::{ErrorAction, LightningError, RoutingMessageHandler, UnsignedNodeAnnouncement, NodeAnnouncement,
-          UnsignedChannelAnnouncement, ChannelAnnouncement, UnsignedChannelUpdate, ChannelUpdate, HTLCFailChannelUpdate};
-       use util::test_utils;
-       use util::test_utils::TestVecWriter;
-       use util::logger::Logger;
-       use util::ser::{Writeable, Readable};
-
-       use bitcoin::hashes::sha256d::Hash as Sha256dHash;
-       use bitcoin::hashes::Hash;
-       use bitcoin::hash_types::BlockHash;
-       use bitcoin::network::constants::Network;
-       use bitcoin::blockdata::constants::genesis_block;
-       use bitcoin::blockdata::script::Builder;
-       use bitcoin::blockdata::opcodes;
-       use bitcoin::util::hash::BitcoinHash;
-
-       use hex;
-
-       use bitcoin::secp256k1::key::{PublicKey,SecretKey};
-       use bitcoin::secp256k1::All;
-       use bitcoin::secp256k1::Secp256k1;
-
-       use std::sync::Arc;
-       use std::collections::btree_map::Entry as BtreeEntry;
-
-       fn create_router() -> (Secp256k1<All>, PublicKey, Router) {
-               let secp_ctx = Secp256k1::new();
-               let our_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap());
-               let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
-               let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
-               let router = Router::new(our_id, chain_monitor, Arc::clone(&logger));
-               (secp_ctx, our_id, router)
-       }
-
-       #[test]
-       fn route_test() {
-               let (secp_ctx, our_id, router) = create_router();
-
-               // Build network from our_id to node8:
-               //
-               //        -1(1)2-  node1  -1(3)2-
-               //       /                       \
-               // our_id -1(12)2- node8 -1(13)2--- node3
-               //       \                       /
-               //        -1(2)2-  node2  -1(4)2-
-               //
-               //
-               // chan1  1-to-2: disabled
-               // chan1  2-to-1: enabled, 0 fee
-               //
-               // chan2  1-to-2: enabled, ignored fee
-               // chan2  2-to-1: enabled, 0 fee
-               //
-               // chan3  1-to-2: enabled, 0 fee
-               // chan3  2-to-1: enabled, 100 msat fee
-               //
-               // chan4  1-to-2: enabled, 100% fee
-               // chan4  2-to-1: enabled, 0 fee
-               //
-               // chan12 1-to-2: enabled, ignored fee
-               // chan12 2-to-1: enabled, 0 fee
-               //
-               // chan13 1-to-2: enabled, 200% fee
-               // chan13 2-to-1: enabled, 0 fee
-               //
-               //
-               //       -1(5)2- node4 -1(8)2--
-               //       |         2          |
-               //       |       (11)         |
-               //      /          1           \
-               // node3--1(6)2- node5 -1(9)2--- node7 (not in global route map)
-               //      \                      /
-               //       -1(7)2- node6 -1(10)2-
-               //
-               // chan5  1-to-2: enabled, 100 msat fee
-               // chan5  2-to-1: enabled, 0 fee
-               //
-               // chan6  1-to-2: enabled, 0 fee
-               // chan6  2-to-1: enabled, 0 fee
-               //
-               // chan7  1-to-2: enabled, 100% fee
-               // chan7  2-to-1: enabled, 0 fee
-               //
-               // chan8  1-to-2: enabled, variable fee (0 then 1000 msat)
-               // chan8  2-to-1: enabled, 0 fee
-               //
-               // chan9  1-to-2: enabled, 1001 msat fee
-               // chan9  2-to-1: enabled, 0 fee
-               //
-               // chan10 1-to-2: enabled, 0 fee
-               // chan10 2-to-1: enabled, 0 fee
-               //
-               // chan11 1-to-2: enabled, 0 fee
-               // chan11 2-to-1: enabled, 0 fee
-
-               let node1 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()[..]).unwrap());
-               let node2 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()[..]).unwrap());
-               let node3 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap()[..]).unwrap());
-               let node4 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()[..]).unwrap());
-               let node5 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0606060606060606060606060606060606060606060606060606060606060606").unwrap()[..]).unwrap());
-               let node6 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0707070707070707070707070707070707070707070707070707070707070707").unwrap()[..]).unwrap());
-               let node7 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0808080808080808080808080808080808080808080808080808080808080808").unwrap()[..]).unwrap());
-               let node8 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0909090909090909090909090909090909090909090909090909090909090909").unwrap()[..]).unwrap());
-
-               let zero_hash = BlockHash::hash(&[0; 32]);
-
-               macro_rules! id_to_feature_flags {
-                       // Set the feature flags to the id'th odd (ie non-required) feature bit so that we can
-                       // test for it later.
-                       ($id: expr) => { {
-                               let idx = ($id - 1) * 2 + 1;
-                               if idx > 8*3 {
-                                       vec![1 << (idx - 8*3), 0, 0, 0]
-                               } else if idx > 8*2 {
-                                       vec![1 << (idx - 8*2), 0, 0]
-                               } else if idx > 8*1 {
-                                       vec![1 << (idx - 8*1), 0]
-                               } else {
-                                       vec![1 << idx]
-                               }
-                       } }
-               }
-
-               {
-                       let mut network = router.network_map.write().unwrap();
-
-                       network.nodes.insert(node1.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(1, zero_hash.clone()), NetworkMap::get_key(3, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 100,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(1)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(1, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(1)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: our_id.clone(),
-                                       last_update: 0,
-                                       enabled: false,
-                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: u32::max_value(), // This value should be ignored
-                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node1.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: 0,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node2.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(2, zero_hash.clone()), NetworkMap::get_key(4, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(2)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(2, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(2)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: our_id.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: u32::max_value(), // This value should be ignored
-                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node2.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: 0,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node8.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(12, zero_hash.clone()), NetworkMap::get_key(13, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(8)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(12, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(12)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: our_id.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: u32::max_value(), // This value should be ignored
-                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node8.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: 0,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node3.clone(), NodeInfo {
-                               channels: vec!(
-                                       NetworkMap::get_key(3, zero_hash.clone()),
-                                       NetworkMap::get_key(4, zero_hash.clone()),
-                                       NetworkMap::get_key(13, zero_hash.clone()),
-                                       NetworkMap::get_key(5, zero_hash.clone()),
-                                       NetworkMap::get_key(6, zero_hash.clone()),
-                                       NetworkMap::get_key(7, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(3)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(3, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(3)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node1.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (3 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (3 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 100,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(4, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(4)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node2.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (4 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 1000000,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (4 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(13, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(13)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node8.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (13 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 2000000,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (13 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node4.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(5, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(4)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(5, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(5)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (5 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 100,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node4.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (5 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node5.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(6, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(5)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(6, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(6)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (6 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node5.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (6 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(11, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(11)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node5.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (11 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node4.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (11 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-                       network.nodes.insert(node6.clone(), NodeInfo {
-                               channels: vec!(NetworkMap::get_key(7, zero_hash.clone())),
-                               lowest_inbound_channel_fee_base_msat: 0,
-                               lowest_inbound_channel_fee_proportional_millionths: 0,
-                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(6)),
-                               last_update: Some(1),
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               announcement_message: None,
-                       });
-                       network.channels.insert(NetworkMap::get_key(7, zero_hash.clone()), ChannelInfo {
-                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(7)),
-                               one_to_two: DirectionalChannelInfo {
-                                       src_node_id: node3.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (7 << 8) | 1,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 1000000,
-                                       last_update_message: None,
-                               }, two_to_one: DirectionalChannelInfo {
-                                       src_node_id: node6.clone(),
-                                       last_update: 0,
-                                       enabled: true,
-                                       cltv_expiry_delta: (7 << 8) | 2,
-                                       htlc_minimum_msat: 0,
-                                       fee_base_msat: 0,
-                                       fee_proportional_millionths: 0,
-                                       last_update_message: None,
-                               },
-                               announcement_message: None,
-                       });
-               }
-
-               { // Simple route to 3 via 2
-                       let route = router.get_route(&node3, None, &Vec::new(), 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 2);
-
-                       assert_eq!(route.paths[0][0].pubkey, node2);
-                       assert_eq!(route.paths[0][0].short_channel_id, 2);
-                       assert_eq!(route.paths[0][0].fee_msat, 100);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 4);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
-               }
-
-               { // Disable channels 4 and 12 by requiring unknown feature bits
-                       let mut network = router.network_map.write().unwrap();
-                       network.channels.get_mut(&NetworkMap::get_key(4, zero_hash.clone())).unwrap().features.set_required_unknown_bits();
-                       network.channels.get_mut(&NetworkMap::get_key(12, zero_hash.clone())).unwrap().features.set_required_unknown_bits();
-               }
-
-               { // If all the channels require some features we don't understand, route should fail
-                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = router.get_route(&node3, None, &Vec::new(), 100, 42) {
-                               assert_eq!(err, "Failed to find a path to the given destination");
-                       } else { panic!(); }
-               }
-
-               { // If we specify a channel to node8, that overrides our local channel view and that gets used
-                       let our_chans = vec![channelmanager::ChannelDetails {
-                               channel_id: [0; 32],
-                               short_channel_id: Some(42),
-                               remote_network_id: node8.clone(),
-                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
-                               channel_value_satoshis: 0,
-                               user_id: 0,
-                               outbound_capacity_msat: 0,
-                               inbound_capacity_msat: 0,
-                               is_live: true,
-                       }];
-                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 2);
-
-                       assert_eq!(route.paths[0][0].pubkey, node8);
-                       assert_eq!(route.paths[0][0].short_channel_id, 42);
-                       assert_eq!(route.paths[0][0].fee_msat, 200);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 13);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
-               }
-
-               { // Re-enable channels 4 and 12 by wiping the unknown feature bits
-                       let mut network = router.network_map.write().unwrap();
-                       network.channels.get_mut(&NetworkMap::get_key(4, zero_hash.clone())).unwrap().features.clear_unknown_bits();
-                       network.channels.get_mut(&NetworkMap::get_key(12, zero_hash.clone())).unwrap().features.clear_unknown_bits();
-               }
-
-               { // Disable nodes 1, 2, and 8 by requiring unknown feature bits
-                       let mut network = router.network_map.write().unwrap();
-                       network.nodes.get_mut(&node1).unwrap().features.set_required_unknown_bits();
-                       network.nodes.get_mut(&node2).unwrap().features.set_required_unknown_bits();
-                       network.nodes.get_mut(&node8).unwrap().features.set_required_unknown_bits();
-               }
-
-               { // If all nodes require some features we don't understand, route should fail
-                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = router.get_route(&node3, None, &Vec::new(), 100, 42) {
-                               assert_eq!(err, "Failed to find a path to the given destination");
-                       } else { panic!(); }
-               }
-
-               { // If we specify a channel to node8, that overrides our local channel view and that gets used
-                       let our_chans = vec![channelmanager::ChannelDetails {
-                               channel_id: [0; 32],
-                               short_channel_id: Some(42),
-                               remote_network_id: node8.clone(),
-                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
-                               channel_value_satoshis: 0,
-                               user_id: 0,
-                               outbound_capacity_msat: 0,
-                               inbound_capacity_msat: 0,
-                               is_live: true,
-                       }];
-                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 2);
-
-                       assert_eq!(route.paths[0][0].pubkey, node8);
-                       assert_eq!(route.paths[0][0].short_channel_id, 42);
-                       assert_eq!(route.paths[0][0].fee_msat, 200);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 13);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
-               }
-
-               { // Re-enable nodes 1, 2, and 8
-                       let mut network = router.network_map.write().unwrap();
-                       network.nodes.get_mut(&node1).unwrap().features.clear_unknown_bits();
-                       network.nodes.get_mut(&node2).unwrap().features.clear_unknown_bits();
-                       network.nodes.get_mut(&node8).unwrap().features.clear_unknown_bits();
-               }
-
-               // Note that we don't test disabling node 3 and failing to route to it, as we (somewhat
-               // naively) assume that the user checked the feature bits on the invoice, which override
-               // the node_announcement.
-
-               { // Route to 1 via 2 and 3 because our channel to 1 is disabled
-                       let route = router.get_route(&node1, None, &Vec::new(), 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 3);
-
-                       assert_eq!(route.paths[0][0].pubkey, node2);
-                       assert_eq!(route.paths[0][0].short_channel_id, 2);
-                       assert_eq!(route.paths[0][0].fee_msat, 200);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 4);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (3 << 8) | 2);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
-
-                       assert_eq!(route.paths[0][2].pubkey, node1);
-                       assert_eq!(route.paths[0][2].short_channel_id, 3);
-                       assert_eq!(route.paths[0][2].fee_msat, 100);
-                       assert_eq!(route.paths[0][2].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(1));
-                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(3));
-               }
-
-               { // If we specify a channel to node8, that overrides our local channel view and that gets used
-                       let our_chans = vec![channelmanager::ChannelDetails {
-                               channel_id: [0; 32],
-                               short_channel_id: Some(42),
-                               remote_network_id: node8.clone(),
-                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
-                               channel_value_satoshis: 0,
-                               user_id: 0,
-                               outbound_capacity_msat: 0,
-                               inbound_capacity_msat: 0,
-                               is_live: true,
-                       }];
-                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 2);
-
-                       assert_eq!(route.paths[0][0].pubkey, node8);
-                       assert_eq!(route.paths[0][0].short_channel_id, 42);
-                       assert_eq!(route.paths[0][0].fee_msat, 200);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 13);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
-               }
-
-               let mut last_hops = vec!(RouteHint {
-                               src_node_id: node4.clone(),
-                               short_channel_id: 8,
-                               fee_base_msat: 0,
-                               fee_proportional_millionths: 0,
-                               cltv_expiry_delta: (8 << 8) | 1,
-                               htlc_minimum_msat: 0,
-                       }, RouteHint {
-                               src_node_id: node5.clone(),
-                               short_channel_id: 9,
-                               fee_base_msat: 1001,
-                               fee_proportional_millionths: 0,
-                               cltv_expiry_delta: (9 << 8) | 1,
-                               htlc_minimum_msat: 0,
-                       }, RouteHint {
-                               src_node_id: node6.clone(),
-                               short_channel_id: 10,
-                               fee_base_msat: 0,
-                               fee_proportional_millionths: 0,
-                               cltv_expiry_delta: (10 << 8) | 1,
-                               htlc_minimum_msat: 0,
-                       });
-
-               { // Simple test across 2, 3, 5, and 4 via a last_hop channel
-                       let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 5);
-
-                       assert_eq!(route.paths[0][0].pubkey, node2);
-                       assert_eq!(route.paths[0][0].short_channel_id, 2);
-                       assert_eq!(route.paths[0][0].fee_msat, 100);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 4);
-                       assert_eq!(route.paths[0][1].fee_msat, 0);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (6 << 8) | 1);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
-
-                       assert_eq!(route.paths[0][2].pubkey, node5);
-                       assert_eq!(route.paths[0][2].short_channel_id, 6);
-                       assert_eq!(route.paths[0][2].fee_msat, 0);
-                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (11 << 8) | 1);
-                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(5));
-                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(6));
-
-                       assert_eq!(route.paths[0][3].pubkey, node4);
-                       assert_eq!(route.paths[0][3].short_channel_id, 11);
-                       assert_eq!(route.paths[0][3].fee_msat, 0);
-                       assert_eq!(route.paths[0][3].cltv_expiry_delta, (8 << 8) | 1);
-                       // If we have a peer in the node map, we'll use their features here since we don't have
-                       // a way of figuring out their features from the invoice:
-                       assert_eq!(route.paths[0][3].node_features.le_flags(), &id_to_feature_flags!(4));
-                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &id_to_feature_flags!(11));
-
-                       assert_eq!(route.paths[0][4].pubkey, node7);
-                       assert_eq!(route.paths[0][4].short_channel_id, 8);
-                       assert_eq!(route.paths[0][4].fee_msat, 100);
-                       assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-                       assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
-               }
-
-               { // Simple test with outbound channel to 4 to test that last_hops and first_hops connect
-                       let our_chans = vec![channelmanager::ChannelDetails {
-                               channel_id: [0; 32],
-                               short_channel_id: Some(42),
-                               remote_network_id: node4.clone(),
-                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
-                               channel_value_satoshis: 0,
-                               user_id: 0,
-                               outbound_capacity_msat: 0,
-                               inbound_capacity_msat: 0,
-                               is_live: true,
-                       }];
-                       let route = router.get_route(&node7, Some(&our_chans), &last_hops, 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 2);
-
-                       assert_eq!(route.paths[0][0].pubkey, node4);
-                       assert_eq!(route.paths[0][0].short_channel_id, 42);
-                       assert_eq!(route.paths[0][0].fee_msat, 0);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (8 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
-
-                       assert_eq!(route.paths[0][1].pubkey, node7);
-                       assert_eq!(route.paths[0][1].short_channel_id, 8);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
-               }
-
-               last_hops[0].fee_base_msat = 1000;
-
-               { // Revert to via 6 as the fee on 8 goes up
-                       let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 4);
-
-                       assert_eq!(route.paths[0][0].pubkey, node2);
-                       assert_eq!(route.paths[0][0].short_channel_id, 2);
-                       assert_eq!(route.paths[0][0].fee_msat, 200); // fee increased as its % of value transferred across node
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 4);
-                       assert_eq!(route.paths[0][1].fee_msat, 100);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (7 << 8) | 1);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
-
-                       assert_eq!(route.paths[0][2].pubkey, node6);
-                       assert_eq!(route.paths[0][2].short_channel_id, 7);
-                       assert_eq!(route.paths[0][2].fee_msat, 0);
-                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (10 << 8) | 1);
-                       // If we have a peer in the node map, we'll use their features here since we don't have
-                       // a way of figuring out their features from the invoice:
-                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(6));
-                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(7));
-
-                       assert_eq!(route.paths[0][3].pubkey, node7);
-                       assert_eq!(route.paths[0][3].short_channel_id, 10);
-                       assert_eq!(route.paths[0][3].fee_msat, 100);
-                       assert_eq!(route.paths[0][3].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][3].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
-               }
-
-               { // ...but still use 8 for larger payments as 6 has a variable feerate
-                       let route = router.get_route(&node7, None, &last_hops, 2000, 42).unwrap();
-                       assert_eq!(route.paths[0].len(), 5);
-
-                       assert_eq!(route.paths[0][0].pubkey, node2);
-                       assert_eq!(route.paths[0][0].short_channel_id, 2);
-                       assert_eq!(route.paths[0][0].fee_msat, 3000);
-                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
-                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
-                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
-
-                       assert_eq!(route.paths[0][1].pubkey, node3);
-                       assert_eq!(route.paths[0][1].short_channel_id, 4);
-                       assert_eq!(route.paths[0][1].fee_msat, 0);
-                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (6 << 8) | 1);
-                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
-                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
-
-                       assert_eq!(route.paths[0][2].pubkey, node5);
-                       assert_eq!(route.paths[0][2].short_channel_id, 6);
-                       assert_eq!(route.paths[0][2].fee_msat, 0);
-                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (11 << 8) | 1);
-                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(5));
-                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(6));
-
-                       assert_eq!(route.paths[0][3].pubkey, node4);
-                       assert_eq!(route.paths[0][3].short_channel_id, 11);
-                       assert_eq!(route.paths[0][3].fee_msat, 1000);
-                       assert_eq!(route.paths[0][3].cltv_expiry_delta, (8 << 8) | 1);
-                       // If we have a peer in the node map, we'll use their features here since we don't have
-                       // a way of figuring out their features from the invoice:
-                       assert_eq!(route.paths[0][3].node_features.le_flags(), &id_to_feature_flags!(4));
-                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &id_to_feature_flags!(11));
-
-                       assert_eq!(route.paths[0][4].pubkey, node7);
-                       assert_eq!(route.paths[0][4].short_channel_id, 8);
-                       assert_eq!(route.paths[0][4].fee_msat, 2000);
-                       assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
-                       assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
-                       assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
-               }
-
-               { // Test Router serialization/deserialization
-                       let mut w = TestVecWriter(Vec::new());
-                       let network = router.network_map.read().unwrap();
-                       assert!(!network.channels.is_empty());
-                       assert!(!network.nodes.is_empty());
-                       network.write(&mut w).unwrap();
-                       assert!(<NetworkMap>::read(&mut ::std::io::Cursor::new(&w.0)).unwrap() == *network);
-               }
-       }
-
-       #[test]
-       fn request_full_sync_finite_times() {
-               let (secp_ctx, _, router) = create_router();
-               let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()[..]).unwrap());
-
-               assert!(router.should_request_full_sync(&node_id));
-               assert!(router.should_request_full_sync(&node_id));
-               assert!(router.should_request_full_sync(&node_id));
-               assert!(router.should_request_full_sync(&node_id));
-               assert!(router.should_request_full_sync(&node_id));
-               assert!(!router.should_request_full_sync(&node_id));
-       }
-
-       #[test]
-       fn handling_node_announcements() {
-               let (secp_ctx, _, router) = create_router();
-
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-               let zero_hash = Sha256dHash::hash(&[0; 32]);
-               let first_announcement_time = 500;
-
-               let mut unsigned_announcement = UnsignedNodeAnnouncement {
-                       features: NodeFeatures::known(),
-                       timestamp: first_announcement_time,
-                       node_id: node_id_1,
-                       rgb: [0; 3],
-                       alias: [0; 32],
-                       addresses: Vec::new(),
-                       excess_address_data: Vec::new(),
-                       excess_data: Vec::new(),
-               };
-               let mut msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = NodeAnnouncement {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_announcement.clone()
-               };
-
-               match router.handle_node_announcement(&valid_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!("No existing channels for node_announcement", e.err)
-               };
-
-               {
-                       // Announce a channel to add a corresponding node.
-                       let unsigned_announcement = UnsignedChannelAnnouncement {
-                               features: ChannelFeatures::known(),
-                               chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
-                               short_channel_id: 0,
-                               node_id_1,
-                               node_id_2,
-                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                               excess_data: Vec::new(),
-                       };
-
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_announcement = ChannelAnnouncement {
-                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                               contents: unsigned_announcement.clone(),
-                       };
-                       match router.handle_channel_announcement(&valid_announcement) {
-                               Ok(res) => assert!(res),
-                               _ => panic!()
-                       };
-               }
-
-               match router.handle_node_announcement(&valid_announcement) {
-                       Ok(res) => assert!(res),
-                       Err(_) => panic!()
-               };
-
-               let fake_msghash = hash_to_message!(&zero_hash);
-               match router.handle_node_announcement(
-                       &NodeAnnouncement {
-                               signature: secp_ctx.sign(&fake_msghash, node_1_privkey),
-                               contents: unsigned_announcement.clone()
-               }) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
-               };
-
-               unsigned_announcement.timestamp += 1000;
-               unsigned_announcement.excess_data.push(1);
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let announcement_with_data = NodeAnnouncement {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_announcement.clone()
-               };
-               // Return false because contains excess data.
-               match router.handle_node_announcement(&announcement_with_data) {
-                       Ok(res) => assert!(!res),
-                       Err(_) => panic!()
-               };
-               unsigned_announcement.excess_data = Vec::new();
-
-               // Even though previous announcement was not relayed further, we still accepted it,
-               // so we now won't accept announcements before the previous one.
-               unsigned_announcement.timestamp -= 10;
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let outdated_announcement = NodeAnnouncement {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_announcement.clone()
-               };
-               match router.handle_node_announcement(&outdated_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Update older than last processed update")
-               };
-       }
-
-       #[test]
-       fn handling_channel_announcements() {
-               let secp_ctx = Secp256k1::new();
-               let our_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(
-                  &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap());
-               let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
-               let chain_monitor = Arc::new(test_utils::TestChainWatcher::new());
-               let router = Router::new(our_id, chain_monitor.clone(), Arc::clone(&logger));
-
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-
-               let good_script = Builder::new().push_opcode(opcodes::all::OP_PUSHNUM_2)
-                  .push_slice(&PublicKey::from_secret_key(&secp_ctx, node_1_btckey).serialize())
-                  .push_slice(&PublicKey::from_secret_key(&secp_ctx, node_2_btckey).serialize())
-                  .push_opcode(opcodes::all::OP_PUSHNUM_2)
-                  .push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script().to_v0_p2wsh();
-
-
-               let mut unsigned_announcement = UnsignedChannelAnnouncement {
-                       features: ChannelFeatures::known(),
-                       chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
-                       short_channel_id: 0,
-                       node_id_1,
-                       node_id_2,
-                       bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                       bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                       excess_data: Vec::new(),
-               };
-
-               let channel_key = NetworkMap::get_key(unsigned_announcement.short_channel_id,
-                                                   unsigned_announcement.chain_hash);
-
-               let mut msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-
-               // Test if the UTXO lookups were not supported
-               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::NotSupported);
-
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(res) => assert!(res),
-                       _ => panic!()
-               };
-               {
-                       let network = router.network_map.write().unwrap();
-                       match network.channels.get(&channel_key) {
-                               None => panic!(),
-                               Some(_) => ()
-                       }
-               }
-
-               // If we receive announcement for the same channel (with UTXO lookups disabled),
-               // drop new one on the floor, since we can't see any changes.
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Already have knowledge of channel")
-               };
-
-
-               // Test if an associated transaction were not on-chain (or not confirmed).
-               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::UnknownTx);
-               unsigned_announcement.short_channel_id += 1;
-
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Channel announced without corresponding UTXO entry")
-               };
-
-
-               // Now test if the transaction is found in the UTXO set and the script is correct.
-               unsigned_announcement.short_channel_id += 1;
-               *chain_monitor.utxo_ret.lock().unwrap() = Ok((good_script.clone(), 0));
-               let channel_key = NetworkMap::get_key(unsigned_announcement.short_channel_id,
-                                                  unsigned_announcement.chain_hash);
-
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(res) => assert!(res),
-                       _ => panic!()
-               };
-               {
-                       let network = router.network_map.write().unwrap();
-                       match network.channels.get(&channel_key) {
-                               None => panic!(),
-                               Some(_) => ()
-                       }
-               }
-
-               // If we receive announcement for the same channel (but TX is not confirmed),
-               // drop new one on the floor, since we can't see any changes.
-               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::UnknownTx);
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Channel announced without corresponding UTXO entry")
-               };
-
-               // But if it is confirmed, replace the channel
-               *chain_monitor.utxo_ret.lock().unwrap() = Ok((good_script, 0));
-               unsigned_announcement.features = ChannelFeatures::empty();
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(res) => assert!(res),
-                       _ => panic!()
-               };
-               {
-                       let mut network = router.network_map.write().unwrap();
-                       match network.channels.entry(channel_key) {
-                               BtreeEntry::Occupied(channel_entry) => {
-                                       assert_eq!(channel_entry.get().features, ChannelFeatures::empty());
-                               },
-                               _ => panic!()
-                       }
-               }
-
-               // Don't relay valid channels with excess data
-               unsigned_announcement.short_channel_id += 1;
-               unsigned_announcement.excess_data.push(1);
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let valid_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-               match router.handle_channel_announcement(&valid_announcement) {
-                       Ok(res) => assert!(!res),
-                       _ => panic!()
-               };
-
-               unsigned_announcement.excess_data = Vec::new();
-               let invalid_sig_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_1_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-               match router.handle_channel_announcement(&invalid_sig_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
-               };
-
-               unsigned_announcement.node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-               let channel_to_itself_announcement = ChannelAnnouncement {
-                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                       node_signature_2: secp_ctx.sign(&msghash, node_1_privkey),
-                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                       contents: unsigned_announcement.clone(),
-               };
-               match router.handle_channel_announcement(&channel_to_itself_announcement) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Channel announcement node had a channel with itself")
-               };
-       }
-
-       #[test]
-       fn handling_channel_update() {
-               let (secp_ctx, _, router) = create_router();
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-
-               let zero_hash = Sha256dHash::hash(&[0; 32]);
-               let short_channel_id = 0;
-               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
-               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
-
-
-               {
-                       // Announce a channel we will update
-                       let unsigned_announcement = UnsignedChannelAnnouncement {
-                               features: ChannelFeatures::empty(),
-                               chain_hash,
-                               short_channel_id,
-                               node_id_1,
-                               node_id_2,
-                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                               excess_data: Vec::new(),
-                       };
-
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_channel_announcement = ChannelAnnouncement {
-                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                               contents: unsigned_announcement.clone(),
-                       };
-                       match router.handle_channel_announcement(&valid_channel_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-
-               }
-
-               let mut unsigned_channel_update = UnsignedChannelUpdate {
-                       chain_hash,
-                       short_channel_id,
-                       timestamp: 100,
-                       flags: 0,
-                       cltv_expiry_delta: 144,
-                       htlc_minimum_msat: 1000000,
-                       fee_base_msat: 10000,
-                       fee_proportional_millionths: 20,
-                       excess_data: Vec::new()
-               };
-               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-               let valid_channel_update = ChannelUpdate {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_channel_update.clone()
-               };
-
-               match router.handle_channel_update(&valid_channel_update) {
-                       Ok(res) => assert!(res),
-                       _ => panic!()
-               };
-
-               {
-                       let network = router.network_map.write().unwrap();
-                       match network.channels.get(&channel_key) {
-                               None => panic!(),
-                               Some(channel_info) => {
-                                       assert_eq!(channel_info.one_to_two.cltv_expiry_delta, 144);
-                                       assert_eq!(channel_info.two_to_one.cltv_expiry_delta, u16::max_value());
-                               }
-                       }
-               }
-
-               unsigned_channel_update.timestamp += 100;
-               unsigned_channel_update.excess_data.push(1);
-               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-               let valid_channel_update = ChannelUpdate {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_channel_update.clone()
-               };
-               // Return false because contains excess data
-               match router.handle_channel_update(&valid_channel_update) {
-                       Ok(res) => assert!(!res),
-                       _ => panic!()
-               };
-
-               unsigned_channel_update.short_channel_id += 1;
-               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-               let valid_channel_update = ChannelUpdate {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_channel_update.clone()
-               };
-
-               match router.handle_channel_update(&valid_channel_update) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Couldn't find channel for update")
-               };
-               unsigned_channel_update.short_channel_id = short_channel_id;
-
-
-               // Even though previous update was not relayed further, we still accepted it,
-               // so we now won't accept update before the previous one.
-               unsigned_channel_update.timestamp -= 10;
-               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-               let valid_channel_update = ChannelUpdate {
-                       signature: secp_ctx.sign(&msghash, node_1_privkey),
-                       contents: unsigned_channel_update.clone()
-               };
-
-               match router.handle_channel_update(&valid_channel_update) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Update older than last processed update")
-               };
-               unsigned_channel_update.timestamp += 500;
-
-               let fake_msghash = hash_to_message!(&zero_hash);
-               let invalid_sig_channel_update = ChannelUpdate {
-                       signature: secp_ctx.sign(&fake_msghash, node_1_privkey),
-                       contents: unsigned_channel_update.clone()
-               };
-
-               match router.handle_channel_update(&invalid_sig_channel_update) {
-                       Ok(_) => panic!(),
-                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
-               };
-
-       }
-
-       #[test]
-       fn handling_htlc_fail_channel_update() {
-               let (secp_ctx, our_id, router) = create_router();
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-
-               let short_channel_id = 0;
-               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
-               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
-
-               {
-                       // There is only local node in the table at the beginning.
-                       let network = router.network_map.read().unwrap();
-                       assert_eq!(network.nodes.len(), 1);
-                       assert_eq!(network.nodes.contains_key(&our_id), true);
-               }
-
-               {
-                       // Announce a channel we will update
-                       let unsigned_announcement = UnsignedChannelAnnouncement {
-                               features: ChannelFeatures::empty(),
-                               chain_hash,
-                               short_channel_id,
-                               node_id_1,
-                               node_id_2,
-                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                               excess_data: Vec::new(),
-                       };
-
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_channel_announcement = ChannelAnnouncement {
-                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                               contents: unsigned_announcement.clone(),
-                       };
-                       match router.handle_channel_announcement(&valid_channel_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-
-               }
-
-               let channel_close_msg = HTLCFailChannelUpdate::ChannelClosed {
-                       short_channel_id,
-                       is_permanent: false
-               };
-
-               router.handle_htlc_fail_channel_update(&channel_close_msg);
-
-               {
-                       // Non-permanent closing just disables a channel
-                       let network = router.network_map.write().unwrap();
-                       match network.channels.get(&channel_key) {
-                               None => panic!(),
-                               Some(channel_info) => {
-                                       assert!(!channel_info.one_to_two.enabled);
-                                       assert!(!channel_info.two_to_one.enabled);
-                               }
-                       }
-               }
-
-               let channel_close_msg = HTLCFailChannelUpdate::ChannelClosed {
-                       short_channel_id,
-                       is_permanent: true
-               };
-
-               router.handle_htlc_fail_channel_update(&channel_close_msg);
-
-               {
-                       // Permanent closing deletes a channel
-                       let network = router.network_map.read().unwrap();
-                       assert_eq!(network.channels.len(), 0);
-                       // Nodes are also deleted because there are no associated channels anymore
-                       // Only the local node remains in the table.
-                       assert_eq!(network.nodes.len(), 1);
-                       assert_eq!(network.nodes.contains_key(&our_id), true);
-               }
-
-               // TODO: Test HTLCFailChannelUpdate::NodeFailure, which is not implemented yet.
-       }
-
-       #[test]
-       fn getting_next_channel_announcements() {
-               let (secp_ctx, _, router) = create_router();
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-
-               let short_channel_id = 1;
-               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
-               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
-
-               // Channels were not announced yet.
-               let channels_with_announcements = router.get_next_channel_announcements(0, 1);
-               assert_eq!(channels_with_announcements.len(), 0);
-
-               {
-                       // Announce a channel we will update
-                       let unsigned_announcement = UnsignedChannelAnnouncement {
-                               features: ChannelFeatures::empty(),
-                               chain_hash,
-                               short_channel_id,
-                               node_id_1,
-                               node_id_2,
-                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                               excess_data: Vec::new(),
-                       };
-
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_channel_announcement = ChannelAnnouncement {
-                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                               contents: unsigned_announcement.clone(),
-                       };
-                       match router.handle_channel_announcement(&valid_channel_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-               }
-
-               // Contains initial channel announcement now.
-               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
-               assert_eq!(channels_with_announcements.len(), 1);
-               if let Some(channel_announcements) = channels_with_announcements.first() {
-                       let &(_, ref update_1, ref update_2) = channel_announcements;
-                       assert_eq!(update_1, &None);
-                       assert_eq!(update_2, &None);
-               } else {
-                       panic!();
-               }
-
-
-               {
-                       // Valid channel update
-                       let unsigned_channel_update = UnsignedChannelUpdate {
-                               chain_hash,
-                               short_channel_id,
-                               timestamp: 101,
-                               flags: 0,
-                               cltv_expiry_delta: 144,
-                               htlc_minimum_msat: 1000000,
-                               fee_base_msat: 10000,
-                               fee_proportional_millionths: 20,
-                               excess_data: Vec::new()
-                       };
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-                       let valid_channel_update = ChannelUpdate {
-                               signature: secp_ctx.sign(&msghash, node_1_privkey),
-                               contents: unsigned_channel_update.clone()
-                       };
-                       match router.handle_channel_update(&valid_channel_update) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-               }
-
-               // Now contains an initial announcement and an update.
-               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
-               assert_eq!(channels_with_announcements.len(), 1);
-               if let Some(channel_announcements) = channels_with_announcements.first() {
-                       let &(_, ref update_1, ref update_2) = channel_announcements;
-                       assert_ne!(update_1, &None);
-                       assert_eq!(update_2, &None);
-               } else {
-                       panic!();
-               }
-
-
-               {
-                       // Channel update with excess data.
-                       let unsigned_channel_update = UnsignedChannelUpdate {
-                               chain_hash,
-                               short_channel_id,
-                               timestamp: 102,
-                               flags: 0,
-                               cltv_expiry_delta: 144,
-                               htlc_minimum_msat: 1000000,
-                               fee_base_msat: 10000,
-                               fee_proportional_millionths: 20,
-                               excess_data: [1; 3].to_vec()
-                       };
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
-                       let valid_channel_update = ChannelUpdate {
-                               signature: secp_ctx.sign(&msghash, node_1_privkey),
-                               contents: unsigned_channel_update.clone()
-                       };
-                       match router.handle_channel_update(&valid_channel_update) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-               }
-
-               // Test that announcements with excess data won't be returned
-               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
-               assert_eq!(channels_with_announcements.len(), 1);
-               if let Some(channel_announcements) = channels_with_announcements.first() {
-                       let &(_, ref update_1, ref update_2) = channel_announcements;
-                       assert_eq!(update_1, &None);
-                       assert_eq!(update_2, &None);
-               } else {
-                       panic!();
-               }
-
-               // Further starting point have no channels after it
-               let channels_with_announcements = router.get_next_channel_announcements(channel_key + 1000, 1);
-               assert_eq!(channels_with_announcements.len(), 0);
-       }
-
-       #[test]
-       fn getting_next_node_announcements() {
-               let (secp_ctx, _, router) = create_router();
-               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
-               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
-               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
-               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
-               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
-               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
-
-               let short_channel_id = 1;
-               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
-
-               // No nodes yet.
-               let next_announcements = router.get_next_node_announcements(None, 10);
-               assert_eq!(next_announcements.len(), 0);
-
-               {
-                       // Announce a channel to add 2 nodes
-                       let unsigned_announcement = UnsignedChannelAnnouncement {
-                               features: ChannelFeatures::empty(),
-                               chain_hash,
-                               short_channel_id,
-                               node_id_1,
-                               node_id_2,
-                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
-                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
-                               excess_data: Vec::new(),
-                       };
-
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_channel_announcement = ChannelAnnouncement {
-                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
-                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
-                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
-                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
-                               contents: unsigned_announcement.clone(),
-                       };
-                       match router.handle_channel_announcement(&valid_channel_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-               }
-
-
-               // Nodes were never announced
-               let next_announcements = router.get_next_node_announcements(None, 3);
-               assert_eq!(next_announcements.len(), 0);
-
-               {
-                       let mut unsigned_announcement = UnsignedNodeAnnouncement {
-                               features: NodeFeatures::known(),
-                               timestamp: 1000,
-                               node_id: node_id_1,
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               excess_address_data: Vec::new(),
-                               excess_data: Vec::new(),
-                       };
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_announcement = NodeAnnouncement {
-                               signature: secp_ctx.sign(&msghash, node_1_privkey),
-                               contents: unsigned_announcement.clone()
-                       };
-                       match router.handle_node_announcement(&valid_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-
-                       unsigned_announcement.node_id = node_id_2;
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_announcement = NodeAnnouncement {
-                               signature: secp_ctx.sign(&msghash, node_2_privkey),
-                               contents: unsigned_announcement.clone()
-                       };
-
-                       match router.handle_node_announcement(&valid_announcement) {
-                               Ok(_) => (),
-                               Err(_) => panic!()
-                       };
-               }
-
-               let next_announcements = router.get_next_node_announcements(None, 3);
-               assert_eq!(next_announcements.len(), 2);
-
-               // Skip the first node.
-               let next_announcements = router.get_next_node_announcements(Some(&node_id_1), 2);
-               assert_eq!(next_announcements.len(), 1);
-
-               {
-                       // Later announcement which should not be relayed (excess data) prevent us from sharing a node
-                       let unsigned_announcement = UnsignedNodeAnnouncement {
-                               features: NodeFeatures::known(),
-                               timestamp: 1010,
-                               node_id: node_id_2,
-                               rgb: [0; 3],
-                               alias: [0; 32],
-                               addresses: Vec::new(),
-                               excess_address_data: Vec::new(),
-                               excess_data: [1; 3].to_vec(),
-                       };
-                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
-                       let valid_announcement = NodeAnnouncement {
-                               signature: secp_ctx.sign(&msghash, node_2_privkey),
-                               contents: unsigned_announcement.clone()
-                       };
-                       match router.handle_node_announcement(&valid_announcement) {
-                               Ok(res) => assert!(!res),
-                               Err(_) => panic!()
-                       };
-               }
-
-               let next_announcements = router.get_next_node_announcements(Some(&node_id_1), 2);
-               assert_eq!(next_announcements.len(), 0);
-
-       }
-}
diff --git a/lightning/src/routing/mod.rs b/lightning/src/routing/mod.rs
new file mode 100644 (file)
index 0000000..9e72d7c
--- /dev/null
@@ -0,0 +1,3 @@
+//! Structs and impls for receiving messages about the network and storing the topology live here.
+
+pub mod router;
diff --git a/lightning/src/routing/router.rs b/lightning/src/routing/router.rs
new file mode 100644 (file)
index 0000000..fef99fc
--- /dev/null
@@ -0,0 +1,2662 @@
+//! The top-level routing/network map tracking logic lives here.
+//!
+//! You probably want to create a Router and use that as your RoutingMessageHandler and then
+//! interrogate it to get routes for your own payments.
+
+use bitcoin::secp256k1::key::PublicKey;
+use bitcoin::secp256k1::Secp256k1;
+use bitcoin::secp256k1;
+
+use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+use bitcoin::hashes::Hash;
+use bitcoin::hash_types::BlockHash;
+use bitcoin::blockdata::script::Builder;
+use bitcoin::blockdata::opcodes;
+
+use chain::chaininterface::{ChainError, ChainWatchInterface};
+use ln::channelmanager;
+use ln::features::{ChannelFeatures, NodeFeatures};
+use ln::msgs::{DecodeError,ErrorAction,LightningError,RoutingMessageHandler,NetAddress};
+use ln::msgs;
+use util::ser::{Writeable, Readable, Writer, ReadableArgs};
+use util::logger::Logger;
+
+use std::cmp;
+use std::sync::{RwLock,Arc};
+use std::sync::atomic::{AtomicUsize, Ordering};
+use std::collections::{HashMap,BinaryHeap,BTreeMap};
+use std::collections::btree_map::Entry as BtreeEntry;
+use std;
+
+/// A hop in a route
+#[derive(Clone, PartialEq)]
+pub struct RouteHop {
+       /// The node_id of the node at this hop.
+       pub pubkey: PublicKey,
+       /// The node_announcement features of the node at this hop. For the last hop, these may be
+       /// amended to match the features present in the invoice this node generated.
+       pub node_features: NodeFeatures,
+       /// The channel that should be used from the previous hop to reach this node.
+       pub short_channel_id: u64,
+       /// The channel_announcement features of the channel that should be used from the previous hop
+       /// to reach this node.
+       pub channel_features: ChannelFeatures,
+       /// The fee taken on this hop. For the last hop, this should be the full value of the payment.
+       pub fee_msat: u64,
+       /// The CLTV delta added for this hop. For the last hop, this should be the full CLTV value
+       /// expected at the destination, in excess of the current block height.
+       pub cltv_expiry_delta: u32,
+}
+
+impl Writeable for Vec<RouteHop> {
+       fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+               (self.len() as u8).write(writer)?;
+               for hop in self.iter() {
+                       hop.pubkey.write(writer)?;
+                       hop.node_features.write(writer)?;
+                       hop.short_channel_id.write(writer)?;
+                       hop.channel_features.write(writer)?;
+                       hop.fee_msat.write(writer)?;
+                       hop.cltv_expiry_delta.write(writer)?;
+               }
+               Ok(())
+       }
+}
+
+impl Readable for Vec<RouteHop> {
+       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Vec<RouteHop>, DecodeError> {
+               let hops_count: u8 = Readable::read(reader)?;
+               let mut hops = Vec::with_capacity(hops_count as usize);
+               for _ in 0..hops_count {
+                       hops.push(RouteHop {
+                               pubkey: Readable::read(reader)?,
+                               node_features: Readable::read(reader)?,
+                               short_channel_id: Readable::read(reader)?,
+                               channel_features: Readable::read(reader)?,
+                               fee_msat: Readable::read(reader)?,
+                               cltv_expiry_delta: Readable::read(reader)?,
+                       });
+               }
+               Ok(hops)
+       }
+}
+
+/// A route directs a payment from the sender (us) to the recipient. If the recipient supports MPP,
+/// it can take multiple paths. Each path is composed of one or more hops through the network.
+#[derive(Clone, PartialEq)]
+pub struct Route {
+       /// The list of routes taken for a single (potentially-)multi-part payment. The pubkey of the
+       /// last RouteHop in each path must be the same.
+       /// Each entry represents a list of hops, NOT INCLUDING our own, where the last hop is the
+       /// destination. Thus, this must always be at least length one. While the maximum length of any
+       /// given path is variable, keeping the length of any path to less than 20 should currently
+       /// ensure it is viable.
+       pub paths: Vec<Vec<RouteHop>>,
+}
+
+impl Writeable for Route {
+       fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+               (self.paths.len() as u64).write(writer)?;
+               for hops in self.paths.iter() {
+                       hops.write(writer)?;
+               }
+               Ok(())
+       }
+}
+
+impl Readable for Route {
+       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<Route, DecodeError> {
+               let path_count: u64 = Readable::read(reader)?;
+               let mut paths = Vec::with_capacity(cmp::min(path_count, 128) as usize);
+               for _ in 0..path_count {
+                       paths.push(Readable::read(reader)?);
+               }
+               Ok(Route { paths })
+       }
+}
+
+#[derive(PartialEq)]
+struct DirectionalChannelInfo {
+       src_node_id: PublicKey,
+       last_update: u32,
+       enabled: bool,
+       cltv_expiry_delta: u16,
+       htlc_minimum_msat: u64,
+       fee_base_msat: u32,
+       fee_proportional_millionths: u32,
+       last_update_message: Option<msgs::ChannelUpdate>,
+}
+
+impl std::fmt::Display for DirectionalChannelInfo {
+       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+               write!(f, "src_node_id {}, last_update {}, enabled {}, cltv_expiry_delta {}, htlc_minimum_msat {}, fee_base_msat {}, fee_proportional_millionths {}", log_pubkey!(self.src_node_id), self.last_update, self.enabled, self.cltv_expiry_delta, self.htlc_minimum_msat, self.fee_base_msat, self.fee_proportional_millionths)?;
+               Ok(())
+       }
+}
+
+impl_writeable!(DirectionalChannelInfo, 0, {
+       src_node_id,
+       last_update,
+       enabled,
+       cltv_expiry_delta,
+       htlc_minimum_msat,
+       fee_base_msat,
+       fee_proportional_millionths,
+       last_update_message
+});
+
+#[derive(PartialEq)]
+struct ChannelInfo {
+       features: ChannelFeatures,
+       one_to_two: DirectionalChannelInfo,
+       two_to_one: DirectionalChannelInfo,
+       //this is cached here so we can send out it later if required by route_init_sync
+       //keep an eye on this to see if the extra memory is a problem
+       announcement_message: Option<msgs::ChannelAnnouncement>,
+}
+
+impl std::fmt::Display for ChannelInfo {
+       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+               write!(f, "features: {}, one_to_two: {}, two_to_one: {}", log_bytes!(self.features.encode()), self.one_to_two, self.two_to_one)?;
+               Ok(())
+       }
+}
+
+impl_writeable!(ChannelInfo, 0, {
+       features,
+       one_to_two,
+       two_to_one,
+       announcement_message
+});
+
+#[derive(PartialEq)]
+struct NodeInfo {
+       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
+       channels: Vec<(u64, Sha256dHash)>,
+       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
+       channels: Vec<u64>,
+
+       lowest_inbound_channel_fee_base_msat: u32,
+       lowest_inbound_channel_fee_proportional_millionths: u32,
+
+       features: NodeFeatures,
+       /// Unlike for channels, we may have a NodeInfo entry before having received a node_update.
+       /// Thus, we have to be able to capture "no update has been received", which we do with an
+       /// Option here.
+       last_update: Option<u32>,
+       rgb: [u8; 3],
+       alias: [u8; 32],
+       addresses: Vec<NetAddress>,
+       //this is cached here so we can send out it later if required by route_init_sync
+       //keep an eye on this to see if the extra memory is a problem
+       announcement_message: Option<msgs::NodeAnnouncement>,
+}
+
+impl std::fmt::Display for NodeInfo {
+       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+               write!(f, "features: {}, last_update: {:?}, lowest_inbound_channel_fee_base_msat: {}, lowest_inbound_channel_fee_proportional_millionths: {}, channels: {:?}", log_bytes!(self.features.encode()), self.last_update, self.lowest_inbound_channel_fee_base_msat, self.lowest_inbound_channel_fee_proportional_millionths, &self.channels[..])?;
+               Ok(())
+       }
+}
+
+impl Writeable for NodeInfo {
+       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+               (self.channels.len() as u64).write(writer)?;
+               for ref chan in self.channels.iter() {
+                       chan.write(writer)?;
+               }
+               self.lowest_inbound_channel_fee_base_msat.write(writer)?;
+               self.lowest_inbound_channel_fee_proportional_millionths.write(writer)?;
+               self.features.write(writer)?;
+               self.last_update.write(writer)?;
+               self.rgb.write(writer)?;
+               self.alias.write(writer)?;
+               (self.addresses.len() as u64).write(writer)?;
+               for ref addr in &self.addresses {
+                       addr.write(writer)?;
+               }
+               self.announcement_message.write(writer)?;
+               Ok(())
+       }
+}
+
+const MAX_ALLOC_SIZE: u64 = 64*1024;
+
+impl Readable for NodeInfo {
+       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<NodeInfo, DecodeError> {
+               let channels_count: u64 = Readable::read(reader)?;
+               let mut channels = Vec::with_capacity(cmp::min(channels_count, MAX_ALLOC_SIZE / 8) as usize);
+               for _ in 0..channels_count {
+                       channels.push(Readable::read(reader)?);
+               }
+               let lowest_inbound_channel_fee_base_msat = Readable::read(reader)?;
+               let lowest_inbound_channel_fee_proportional_millionths = Readable::read(reader)?;
+               let features = Readable::read(reader)?;
+               let last_update = Readable::read(reader)?;
+               let rgb = Readable::read(reader)?;
+               let alias = Readable::read(reader)?;
+               let addresses_count: u64 = Readable::read(reader)?;
+               let mut addresses = Vec::with_capacity(cmp::min(addresses_count, MAX_ALLOC_SIZE / 40) as usize);
+               for _ in 0..addresses_count {
+                       match Readable::read(reader) {
+                               Ok(Ok(addr)) => { addresses.push(addr); },
+                               Ok(Err(_)) => return Err(DecodeError::InvalidValue),
+                               Err(DecodeError::ShortRead) => return Err(DecodeError::BadLengthDescriptor),
+                               _ => unreachable!(),
+                       }
+               }
+               let announcement_message = Readable::read(reader)?;
+               Ok(NodeInfo {
+                       channels,
+                       lowest_inbound_channel_fee_base_msat,
+                       lowest_inbound_channel_fee_proportional_millionths,
+                       features,
+                       last_update,
+                       rgb,
+                       alias,
+                       addresses,
+                       announcement_message
+               })
+       }
+}
+
+#[derive(PartialEq)]
+struct NetworkMap {
+       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
+       channels: BTreeMap<(u64, Sha256dHash), ChannelInfo>,
+       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
+       channels: BTreeMap<u64, ChannelInfo>,
+
+       our_node_id: PublicKey,
+       nodes: BTreeMap<PublicKey, NodeInfo>,
+}
+
+impl Writeable for NetworkMap {
+       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+               (self.channels.len() as u64).write(writer)?;
+               for (ref chan_id, ref chan_info) in self.channels.iter() {
+                       (*chan_id).write(writer)?;
+                       chan_info.write(writer)?;
+               }
+               self.our_node_id.write(writer)?;
+               (self.nodes.len() as u64).write(writer)?;
+               for (ref node_id, ref node_info) in self.nodes.iter() {
+                       node_id.write(writer)?;
+                       node_info.write(writer)?;
+               }
+               Ok(())
+       }
+}
+
+impl Readable for NetworkMap {
+       fn read<R: ::std::io::Read>(reader: &mut R) -> Result<NetworkMap, DecodeError> {
+               let channels_count: u64 = Readable::read(reader)?;
+               let mut channels = BTreeMap::new();
+               for _ in 0..channels_count {
+                       let chan_id: u64 = Readable::read(reader)?;
+                       let chan_info = Readable::read(reader)?;
+                       channels.insert(chan_id, chan_info);
+               }
+               let our_node_id = Readable::read(reader)?;
+               let nodes_count: u64 = Readable::read(reader)?;
+               let mut nodes = BTreeMap::new();
+               for _ in 0..nodes_count {
+                       let node_id = Readable::read(reader)?;
+                       let node_info = Readable::read(reader)?;
+                       nodes.insert(node_id, node_info);
+               }
+               Ok(NetworkMap {
+                       channels,
+                       our_node_id,
+                       nodes,
+               })
+       }
+}
+
+impl std::fmt::Display for NetworkMap {
+       fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
+               write!(f, "Node id {} network map\n[Channels]\n", log_pubkey!(self.our_node_id))?;
+               for (key, val) in self.channels.iter() {
+                       write!(f, " {}: {}\n", key, val)?;
+               }
+               write!(f, "[Nodes]\n")?;
+               for (key, val) in self.nodes.iter() {
+                       write!(f, " {}: {}\n", log_pubkey!(key), val)?;
+               }
+               Ok(())
+       }
+}
+
+impl NetworkMap {
+       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
+       #[inline]
+       fn get_key(short_channel_id: u64, chain_hash: BlockHash) -> (u64, BlockHash) {
+               (short_channel_id, chain_hash)
+       }
+
+       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
+       #[inline]
+       fn get_key(short_channel_id: u64, _: BlockHash) -> u64 {
+               short_channel_id
+       }
+
+       #[cfg(feature = "non_bitcoin_chain_hash_routing")]
+       #[inline]
+       fn get_short_id(id: &(u64, BlockHash)) -> &u64 {
+               &id.0
+       }
+
+       #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
+       #[inline]
+       fn get_short_id(id: &u64) -> &u64 {
+               id
+       }
+}
+
+/// A channel descriptor which provides a last-hop route to get_route
+pub struct RouteHint {
+       /// The node_id of the non-target end of the route
+       pub src_node_id: PublicKey,
+       /// The short_channel_id of this channel
+       pub short_channel_id: u64,
+       /// The static msat-denominated fee which must be paid to use this channel
+       pub fee_base_msat: u32,
+       /// The dynamic proportional fee which must be paid to use this channel, denominated in
+       /// millionths of the value being forwarded to the next hop.
+       pub fee_proportional_millionths: u32,
+       /// The difference in CLTV values between this node and the next node.
+       pub cltv_expiry_delta: u16,
+       /// The minimum value, in msat, which must be relayed to the next hop.
+       pub htlc_minimum_msat: u64,
+}
+
+/// Tracks a view of the network, receiving updates from peers and generating Routes to
+/// payment destinations.
+pub struct Router {
+       secp_ctx: Secp256k1<secp256k1::VerifyOnly>,
+       network_map: RwLock<NetworkMap>,
+       full_syncs_requested: AtomicUsize,
+       chain_monitor: Arc<ChainWatchInterface>,
+       logger: Arc<Logger>,
+}
+
+const SERIALIZATION_VERSION: u8 = 1;
+const MIN_SERIALIZATION_VERSION: u8 = 1;
+
+impl Writeable for Router {
+       fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
+               writer.write_all(&[SERIALIZATION_VERSION; 1])?;
+               writer.write_all(&[MIN_SERIALIZATION_VERSION; 1])?;
+
+               let network = self.network_map.read().unwrap();
+               network.write(writer)?;
+               Ok(())
+       }
+}
+
+/// Arguments for the creation of a Router that are not deserialized.
+/// At a high-level, the process for deserializing a Router and resuming normal operation is:
+/// 1) Deserialize the Router by filling in this struct and calling <Router>::read(reaser, args).
+/// 2) Register the new Router with your ChainWatchInterface
+pub struct RouterReadArgs {
+       /// The ChainWatchInterface for use in the Router in the future.
+       ///
+       /// No calls to the ChainWatchInterface will be made during deserialization.
+       pub chain_monitor: Arc<ChainWatchInterface>,
+       /// The Logger for use in the ChannelManager and which may be used to log information during
+       /// deserialization.
+       pub logger: Arc<Logger>,
+}
+
+impl ReadableArgs<RouterReadArgs> for Router {
+       fn read<R: ::std::io::Read>(reader: &mut R, args: RouterReadArgs) -> Result<Router, DecodeError> {
+               let _ver: u8 = Readable::read(reader)?;
+               let min_ver: u8 = Readable::read(reader)?;
+               if min_ver > SERIALIZATION_VERSION {
+                       return Err(DecodeError::UnknownVersion);
+               }
+               let network_map = Readable::read(reader)?;
+               Ok(Router {
+                       secp_ctx: Secp256k1::verification_only(),
+                       network_map: RwLock::new(network_map),
+                       full_syncs_requested: AtomicUsize::new(0),
+                       chain_monitor: args.chain_monitor,
+                       logger: args.logger,
+               })
+       }
+}
+
+macro_rules! secp_verify_sig {
+       ( $secp_ctx: expr, $msg: expr, $sig: expr, $pubkey: expr ) => {
+               match $secp_ctx.verify($msg, $sig, $pubkey) {
+                       Ok(_) => {},
+                       Err(_) => return Err(LightningError{err: "Invalid signature from remote node", action: ErrorAction::IgnoreError}),
+               }
+       };
+}
+
+impl RoutingMessageHandler for Router {
+
+       fn handle_node_announcement(&self, msg: &msgs::NodeAnnouncement) -> Result<bool, LightningError> {
+               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
+               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &msg.contents.node_id);
+
+               let mut network = self.network_map.write().unwrap();
+               match network.nodes.get_mut(&msg.contents.node_id) {
+                       None => Err(LightningError{err: "No existing channels for node_announcement", action: ErrorAction::IgnoreError}),
+                       Some(node) => {
+                               match node.last_update {
+                                       Some(last_update) => if last_update >= msg.contents.timestamp {
+                                               return Err(LightningError{err: "Update older than last processed update", action: ErrorAction::IgnoreError});
+                                       },
+                                       None => {},
+                               }
+
+                               node.features = msg.contents.features.clone();
+                               node.last_update = Some(msg.contents.timestamp);
+                               node.rgb = msg.contents.rgb;
+                               node.alias = msg.contents.alias;
+                               node.addresses = msg.contents.addresses.clone();
+
+                               let should_relay = msg.contents.excess_data.is_empty() && msg.contents.excess_address_data.is_empty();
+                               node.announcement_message = if should_relay { Some(msg.clone()) } else { None };
+                               Ok(should_relay)
+                       }
+               }
+       }
+
+       fn handle_channel_announcement(&self, msg: &msgs::ChannelAnnouncement) -> Result<bool, LightningError> {
+               if msg.contents.node_id_1 == msg.contents.node_id_2 || msg.contents.bitcoin_key_1 == msg.contents.bitcoin_key_2 {
+                       return Err(LightningError{err: "Channel announcement node had a channel with itself", action: ErrorAction::IgnoreError});
+               }
+
+               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
+               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_1, &msg.contents.node_id_1);
+               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_2, &msg.contents.node_id_2);
+               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_1, &msg.contents.bitcoin_key_1);
+               secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_2, &msg.contents.bitcoin_key_2);
+
+               let checked_utxo = match self.chain_monitor.get_chain_utxo(msg.contents.chain_hash, msg.contents.short_channel_id) {
+                       Ok((script_pubkey, _value)) => {
+                               let expected_script = Builder::new().push_opcode(opcodes::all::OP_PUSHNUM_2)
+                                                                   .push_slice(&msg.contents.bitcoin_key_1.serialize())
+                                                                   .push_slice(&msg.contents.bitcoin_key_2.serialize())
+                                                                   .push_opcode(opcodes::all::OP_PUSHNUM_2)
+                                                                   .push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script().to_v0_p2wsh();
+                               if script_pubkey != expected_script {
+                                       return Err(LightningError{err: "Channel announcement keys didn't match on-chain script", action: ErrorAction::IgnoreError});
+                               }
+                               //TODO: Check if value is worth storing, use it to inform routing, and compare it
+                               //to the new HTLC max field in channel_update
+                               true
+                       },
+                       Err(ChainError::NotSupported) => {
+                               // Tentatively accept, potentially exposing us to DoS attacks
+                               false
+                       },
+                       Err(ChainError::NotWatched) => {
+                               return Err(LightningError{err: "Channel announced on an unknown chain", action: ErrorAction::IgnoreError});
+                       },
+                       Err(ChainError::UnknownTx) => {
+                               return Err(LightningError{err: "Channel announced without corresponding UTXO entry", action: ErrorAction::IgnoreError});
+                       },
+               };
+
+               let mut network_lock = self.network_map.write().unwrap();
+               let network = &mut *network_lock;
+
+               let should_relay = msg.contents.excess_data.is_empty();
+
+               let chan_info = ChannelInfo {
+                               features: msg.contents.features.clone(),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: msg.contents.node_id_1.clone(),
+                                       last_update: 0,
+                                       enabled: false,
+                                       cltv_expiry_delta: u16::max_value(),
+                                       htlc_minimum_msat: u64::max_value(),
+                                       fee_base_msat: u32::max_value(),
+                                       fee_proportional_millionths: u32::max_value(),
+                                       last_update_message: None,
+                               },
+                               two_to_one: DirectionalChannelInfo {
+                                       src_node_id: msg.contents.node_id_2.clone(),
+                                       last_update: 0,
+                                       enabled: false,
+                                       cltv_expiry_delta: u16::max_value(),
+                                       htlc_minimum_msat: u64::max_value(),
+                                       fee_base_msat: u32::max_value(),
+                                       fee_proportional_millionths: u32::max_value(),
+                                       last_update_message: None,
+                               },
+                               announcement_message: if should_relay { Some(msg.clone()) } else { None },
+                       };
+
+               match network.channels.entry(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
+                       BtreeEntry::Occupied(mut entry) => {
+                               //TODO: because asking the blockchain if short_channel_id is valid is only optional
+                               //in the blockchain API, we need to handle it smartly here, though it's unclear
+                               //exactly how...
+                               if checked_utxo {
+                                       // Either our UTXO provider is busted, there was a reorg, or the UTXO provider
+                                       // only sometimes returns results. In any case remove the previous entry. Note
+                                       // that the spec expects us to "blacklist" the node_ids involved, but we can't
+                                       // do that because
+                                       // a) we don't *require* a UTXO provider that always returns results.
+                                       // b) we don't track UTXOs of channels we know about and remove them if they
+                                       //    get reorg'd out.
+                                       // c) it's unclear how to do so without exposing ourselves to massive DoS risk.
+                                       Self::remove_channel_in_nodes(&mut network.nodes, &entry.get(), msg.contents.short_channel_id);
+                                       *entry.get_mut() = chan_info;
+                               } else {
+                                       return Err(LightningError{err: "Already have knowledge of channel", action: ErrorAction::IgnoreError})
+                               }
+                       },
+                       BtreeEntry::Vacant(entry) => {
+                               entry.insert(chan_info);
+                       }
+               };
+
+               macro_rules! add_channel_to_node {
+                       ( $node_id: expr ) => {
+                               match network.nodes.entry($node_id) {
+                                       BtreeEntry::Occupied(node_entry) => {
+                                               node_entry.into_mut().channels.push(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash));
+                                       },
+                                       BtreeEntry::Vacant(node_entry) => {
+                                               node_entry.insert(NodeInfo {
+                                                       channels: vec!(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)),
+                                                       lowest_inbound_channel_fee_base_msat: u32::max_value(),
+                                                       lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
+                                                       features: NodeFeatures::empty(),
+                                                       last_update: None,
+                                                       rgb: [0; 3],
+                                                       alias: [0; 32],
+                                                       addresses: Vec::new(),
+                                                       announcement_message: None,
+                                               });
+                                       }
+                               }
+                       };
+               }
+
+               add_channel_to_node!(msg.contents.node_id_1);
+               add_channel_to_node!(msg.contents.node_id_2);
+
+               log_trace!(self, "Added channel_announcement for {}{}", msg.contents.short_channel_id, if !should_relay { " with excess uninterpreted data!" } else { "" });
+               Ok(should_relay)
+       }
+
+       fn handle_htlc_fail_channel_update(&self, update: &msgs::HTLCFailChannelUpdate) {
+               match update {
+                       &msgs::HTLCFailChannelUpdate::ChannelUpdateMessage { ref msg } => {
+                               let _ = self.handle_channel_update(msg);
+                       },
+                       &msgs::HTLCFailChannelUpdate::ChannelClosed { ref short_channel_id, ref is_permanent } => {
+                               let mut network = self.network_map.write().unwrap();
+                               if *is_permanent {
+                                       if let Some(chan) = network.channels.remove(short_channel_id) {
+                                               Self::remove_channel_in_nodes(&mut network.nodes, &chan, *short_channel_id);
+                                       }
+                               } else {
+                                       if let Some(chan) = network.channels.get_mut(short_channel_id) {
+                                               chan.one_to_two.enabled = false;
+                                               chan.two_to_one.enabled = false;
+                                       }
+                               }
+                       },
+                       &msgs::HTLCFailChannelUpdate::NodeFailure { ref node_id, ref is_permanent } => {
+                               if *is_permanent {
+                                       //TODO: Wholly remove the node
+                               } else {
+                                       self.mark_node_bad(node_id, false);
+                               }
+                       },
+               }
+       }
+
+       fn handle_channel_update(&self, msg: &msgs::ChannelUpdate) -> Result<bool, LightningError> {
+               let mut network = self.network_map.write().unwrap();
+               let dest_node_id;
+               let chan_enabled = msg.contents.flags & (1 << 1) != (1 << 1);
+               let chan_was_enabled;
+
+               match network.channels.get_mut(&NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
+                       None => return Err(LightningError{err: "Couldn't find channel for update", action: ErrorAction::IgnoreError}),
+                       Some(channel) => {
+                               macro_rules! maybe_update_channel_info {
+                                       ( $target: expr) => {
+                                               if $target.last_update >= msg.contents.timestamp {
+                                                       return Err(LightningError{err: "Update older than last processed update", action: ErrorAction::IgnoreError});
+                                               }
+                                               chan_was_enabled = $target.enabled;
+                                               $target.last_update = msg.contents.timestamp;
+                                               $target.enabled = chan_enabled;
+                                               $target.cltv_expiry_delta = msg.contents.cltv_expiry_delta;
+                                               $target.htlc_minimum_msat = msg.contents.htlc_minimum_msat;
+                                               $target.fee_base_msat = msg.contents.fee_base_msat;
+                                               $target.fee_proportional_millionths = msg.contents.fee_proportional_millionths;
+                                               $target.last_update_message = if msg.contents.excess_data.is_empty() {
+                                                       Some(msg.clone())
+                                               } else {
+                                                       None
+                                               };
+                                       }
+                               }
+                               let msg_hash = hash_to_message!(&Sha256dHash::hash(&msg.contents.encode()[..])[..]);
+                               if msg.contents.flags & 1 == 1 {
+                                       dest_node_id = channel.one_to_two.src_node_id.clone();
+                                       secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.two_to_one.src_node_id);
+                                       maybe_update_channel_info!(channel.two_to_one);
+                               } else {
+                                       dest_node_id = channel.two_to_one.src_node_id.clone();
+                                       secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.one_to_two.src_node_id);
+                                       maybe_update_channel_info!(channel.one_to_two);
+                               }
+                       }
+               }
+
+               if chan_enabled {
+                       let node = network.nodes.get_mut(&dest_node_id).unwrap();
+                       node.lowest_inbound_channel_fee_base_msat = cmp::min(node.lowest_inbound_channel_fee_base_msat, msg.contents.fee_base_msat);
+                       node.lowest_inbound_channel_fee_proportional_millionths = cmp::min(node.lowest_inbound_channel_fee_proportional_millionths, msg.contents.fee_proportional_millionths);
+               } else if chan_was_enabled {
+                       let mut lowest_inbound_channel_fee_base_msat = u32::max_value();
+                       let mut lowest_inbound_channel_fee_proportional_millionths = u32::max_value();
+
+                       {
+                               let node = network.nodes.get(&dest_node_id).unwrap();
+
+                               for chan_id in node.channels.iter() {
+                                       let chan = network.channels.get(chan_id).unwrap();
+                                       if chan.one_to_two.src_node_id == dest_node_id {
+                                               lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.two_to_one.fee_base_msat);
+                                               lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.two_to_one.fee_proportional_millionths);
+                                       } else {
+                                               lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.one_to_two.fee_base_msat);
+                                               lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.one_to_two.fee_proportional_millionths);
+                                       }
+                               }
+                       }
+
+                       //TODO: satisfy the borrow-checker without a double-map-lookup :(
+                       let mut_node = network.nodes.get_mut(&dest_node_id).unwrap();
+                       mut_node.lowest_inbound_channel_fee_base_msat = lowest_inbound_channel_fee_base_msat;
+                       mut_node.lowest_inbound_channel_fee_proportional_millionths = lowest_inbound_channel_fee_proportional_millionths;
+               }
+
+               Ok(msg.contents.excess_data.is_empty())
+       }
+
+       fn get_next_channel_announcements(&self, starting_point: u64, batch_amount: u8) -> Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> {
+               let mut result = Vec::with_capacity(batch_amount as usize);
+               let network = self.network_map.read().unwrap();
+               let mut iter = network.channels.range(starting_point..);
+               while result.len() < batch_amount as usize {
+                       if let Some((_, ref chan)) = iter.next() {
+                               if chan.announcement_message.is_some() {
+                                       result.push((chan.announcement_message.clone().unwrap(),
+                                               chan.one_to_two.last_update_message.clone(),
+                                               chan.two_to_one.last_update_message.clone()));
+                               } else {
+                                       // TODO: We may end up sending un-announced channel_updates if we are sending
+                                       // initial sync data while receiving announce/updates for this channel.
+                               }
+                       } else {
+                               return result;
+                       }
+               }
+               result
+       }
+
+       fn get_next_node_announcements(&self, starting_point: Option<&PublicKey>, batch_amount: u8) -> Vec<msgs::NodeAnnouncement> {
+               let mut result = Vec::with_capacity(batch_amount as usize);
+               let network = self.network_map.read().unwrap();
+               let mut iter = if let Some(pubkey) = starting_point {
+                               let mut iter = network.nodes.range((*pubkey)..);
+                               iter.next();
+                               iter
+                       } else {
+                               network.nodes.range(..)
+                       };
+               while result.len() < batch_amount as usize {
+                       if let Some((_, ref node)) = iter.next() {
+                               if node.announcement_message.is_some() {
+                                       result.push(node.announcement_message.clone().unwrap());
+                               }
+                       } else {
+                               return result;
+                       }
+               }
+               result
+       }
+
+       fn should_request_full_sync(&self, _node_id: &PublicKey) -> bool {
+               //TODO: Determine whether to request a full sync based on the network map.
+               const FULL_SYNCS_TO_REQUEST: usize = 5;
+               if self.full_syncs_requested.load(Ordering::Acquire) < FULL_SYNCS_TO_REQUEST {
+                       self.full_syncs_requested.fetch_add(1, Ordering::AcqRel);
+                       true
+               } else {
+                       false
+               }
+       }
+}
+
+#[derive(Eq, PartialEq)]
+struct RouteGraphNode {
+       pubkey: PublicKey,
+       lowest_fee_to_peer_through_node: u64,
+       lowest_fee_to_node: u64,
+}
+
+impl cmp::Ord for RouteGraphNode {
+       fn cmp(&self, other: &RouteGraphNode) -> cmp::Ordering {
+               other.lowest_fee_to_peer_through_node.cmp(&self.lowest_fee_to_peer_through_node)
+                       .then_with(|| other.pubkey.serialize().cmp(&self.pubkey.serialize()))
+       }
+}
+
+impl cmp::PartialOrd for RouteGraphNode {
+       fn partial_cmp(&self, other: &RouteGraphNode) -> Option<cmp::Ordering> {
+               Some(self.cmp(other))
+       }
+}
+
+struct DummyDirectionalChannelInfo {
+       src_node_id: PublicKey,
+       cltv_expiry_delta: u32,
+       htlc_minimum_msat: u64,
+       fee_base_msat: u32,
+       fee_proportional_millionths: u32,
+}
+
+impl Router {
+       /// Creates a new router with the given node_id to be used as the source for get_route()
+       pub fn new(our_pubkey: PublicKey, chain_monitor: Arc<ChainWatchInterface>, logger: Arc<Logger>) -> Router {
+               let mut nodes = BTreeMap::new();
+               nodes.insert(our_pubkey.clone(), NodeInfo {
+                       channels: Vec::new(),
+                       lowest_inbound_channel_fee_base_msat: u32::max_value(),
+                       lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
+                       features: NodeFeatures::empty(),
+                       last_update: None,
+                       rgb: [0; 3],
+                       alias: [0; 32],
+                       addresses: Vec::new(),
+                       announcement_message: None,
+               });
+               Router {
+                       secp_ctx: Secp256k1::verification_only(),
+                       network_map: RwLock::new(NetworkMap {
+                               channels: BTreeMap::new(),
+                               our_node_id: our_pubkey,
+                               nodes: nodes,
+                       }),
+                       full_syncs_requested: AtomicUsize::new(0),
+                       chain_monitor,
+                       logger,
+               }
+       }
+
+       /// Dumps the entire network view of this Router to the logger provided in the constructor at
+       /// level Trace
+       pub fn trace_state(&self) {
+               log_trace!(self, "{}", self.network_map.read().unwrap());
+       }
+
+       /// Get network addresses by node id
+       pub fn get_addresses(&self, pubkey: &PublicKey) -> Option<Vec<NetAddress>> {
+               let network = self.network_map.read().unwrap();
+               network.nodes.get(pubkey).map(|n| n.addresses.clone())
+       }
+
+       /// Marks a node as having failed a route. This will avoid re-using the node in routes for now,
+       /// with an exponential decay in node "badness". Note that there is deliberately no
+       /// mark_channel_bad as a node may simply lie and suggest that an upstream channel from it is
+       /// what failed the route and not the node itself. Instead, setting the blamed_upstream_node
+       /// boolean will reduce the penalty, returning the node to usability faster. If the node is
+       /// behaving correctly, it will disable the failing channel and we will use it again next time.
+       pub fn mark_node_bad(&self, _node_id: &PublicKey, _blamed_upstream_node: bool) {
+               unimplemented!();
+       }
+
+       fn remove_channel_in_nodes(nodes: &mut BTreeMap<PublicKey, NodeInfo>, chan: &ChannelInfo, short_channel_id: u64) {
+               macro_rules! remove_from_node {
+                       ($node_id: expr) => {
+                               if let BtreeEntry::Occupied(mut entry) = nodes.entry($node_id) {
+                                       entry.get_mut().channels.retain(|chan_id| {
+                                               short_channel_id != *NetworkMap::get_short_id(chan_id)
+                                       });
+                                       if entry.get().channels.is_empty() {
+                                               entry.remove_entry();
+                                       }
+                               } else {
+                                       panic!("Had channel that pointed to unknown node (ie inconsistent network map)!");
+                               }
+                       }
+               }
+               remove_from_node!(chan.one_to_two.src_node_id);
+               remove_from_node!(chan.two_to_one.src_node_id);
+       }
+
+       /// Gets a route from us to the given target node.
+       ///
+       /// Extra routing hops between known nodes and the target will be used if they are included in
+       /// last_hops.
+       ///
+       /// If some channels aren't announced, it may be useful to fill in a first_hops with the
+       /// results from a local ChannelManager::list_usable_channels() call. If it is filled in, our
+       /// (this Router's) view of our local channels will be ignored, and only those in first_hops
+       /// will be used.
+       ///
+       /// Panics if first_hops contains channels without short_channel_ids
+       /// (ChannelManager::list_usable_channels will never include such channels).
+       ///
+       /// The fees on channels from us to next-hops are ignored (as they are assumed to all be
+       /// equal), however the enabled/disabled bit on such channels as well as the htlc_minimum_msat
+       /// *is* checked as they may change based on the receiving node.
+       pub fn get_route(&self, target: &PublicKey, first_hops: Option<&[channelmanager::ChannelDetails]>, last_hops: &[RouteHint], final_value_msat: u64, final_cltv: u32) -> Result<Route, LightningError> {
+               // TODO: Obviously *only* using total fee cost sucks. We should consider weighting by
+               // uptime/success in using a node in the past.
+               let network = self.network_map.read().unwrap();
+
+               if *target == network.our_node_id {
+                       return Err(LightningError{err: "Cannot generate a route to ourselves", action: ErrorAction::IgnoreError});
+               }
+
+               if final_value_msat > 21_000_000 * 1_0000_0000 * 1000 {
+                       return Err(LightningError{err: "Cannot generate a route of more value than all existing satoshis", action: ErrorAction::IgnoreError});
+               }
+
+               // We do a dest-to-source Dijkstra's sorting by each node's distance from the destination
+               // plus the minimum per-HTLC fee to get from it to another node (aka "shitty A*").
+               // TODO: There are a few tweaks we could do, including possibly pre-calculating more stuff
+               // to use as the A* heuristic beyond just the cost to get one node further than the current
+               // one.
+
+               let dummy_directional_info = DummyDirectionalChannelInfo { // used for first_hops routes
+                       src_node_id: network.our_node_id.clone(),
+                       cltv_expiry_delta: 0,
+                       htlc_minimum_msat: 0,
+                       fee_base_msat: 0,
+                       fee_proportional_millionths: 0,
+               };
+
+               let mut targets = BinaryHeap::new(); //TODO: Do we care about switching to eg Fibbonaci heap?
+               let mut dist = HashMap::with_capacity(network.nodes.len());
+
+               let mut first_hop_targets = HashMap::with_capacity(if first_hops.is_some() { first_hops.as_ref().unwrap().len() } else { 0 });
+               if let Some(hops) = first_hops {
+                       for chan in hops {
+                               let short_channel_id = chan.short_channel_id.expect("first_hops should be filled in with usable channels, not pending ones");
+                               if chan.remote_network_id == *target {
+                                       return Ok(Route {
+                                               paths: vec![vec![RouteHop {
+                                                       pubkey: chan.remote_network_id,
+                                                       node_features: chan.counterparty_features.to_context(),
+                                                       short_channel_id,
+                                                       channel_features: chan.counterparty_features.to_context(),
+                                                       fee_msat: final_value_msat,
+                                                       cltv_expiry_delta: final_cltv,
+                                               }]],
+                                       });
+                               }
+                               first_hop_targets.insert(chan.remote_network_id, (short_channel_id, chan.counterparty_features.clone()));
+                       }
+                       if first_hop_targets.is_empty() {
+                               return Err(LightningError{err: "Cannot route when there are no outbound routes away from us", action: ErrorAction::IgnoreError});
+                       }
+               }
+
+               macro_rules! add_entry {
+                       // Adds entry which goes from the node pointed to by $directional_info to
+                       // $dest_node_id over the channel with id $chan_id with fees described in
+                       // $directional_info.
+                       ( $chan_id: expr, $dest_node_id: expr, $directional_info: expr, $chan_features: expr, $starting_fee_msat: expr ) => {
+                               //TODO: Explore simply adding fee to hit htlc_minimum_msat
+                               if $starting_fee_msat as u64 + final_value_msat >= $directional_info.htlc_minimum_msat {
+                                       let proportional_fee_millions = ($starting_fee_msat + final_value_msat).checked_mul($directional_info.fee_proportional_millionths as u64);
+                                       if let Some(new_fee) = proportional_fee_millions.and_then(|part| {
+                                                       ($directional_info.fee_base_msat as u64).checked_add(part / 1000000) })
+                                       {
+                                               let mut total_fee = $starting_fee_msat as u64;
+                                               let hm_entry = dist.entry(&$directional_info.src_node_id);
+                                               let old_entry = hm_entry.or_insert_with(|| {
+                                                       let node = network.nodes.get(&$directional_info.src_node_id).unwrap();
+                                                       (u64::max_value(),
+                                                               node.lowest_inbound_channel_fee_base_msat,
+                                                               node.lowest_inbound_channel_fee_proportional_millionths,
+                                                               RouteHop {
+                                                                       pubkey: $dest_node_id.clone(),
+                                                                       node_features: NodeFeatures::empty(),
+                                                                       short_channel_id: 0,
+                                                                       channel_features: $chan_features.clone(),
+                                                                       fee_msat: 0,
+                                                                       cltv_expiry_delta: 0,
+                                                       })
+                                               });
+                                               if $directional_info.src_node_id != network.our_node_id {
+                                                       // Ignore new_fee for channel-from-us as we assume all channels-from-us
+                                                       // will have the same effective-fee
+                                                       total_fee += new_fee;
+                                                       if let Some(fee_inc) = final_value_msat.checked_add(total_fee).and_then(|inc| { (old_entry.2 as u64).checked_mul(inc) }) {
+                                                               total_fee += fee_inc / 1000000 + (old_entry.1 as u64);
+                                                       } else {
+                                                               // max_value means we'll always fail the old_entry.0 > total_fee check
+                                                               total_fee = u64::max_value();
+                                                       }
+                                               }
+                                               let new_graph_node = RouteGraphNode {
+                                                       pubkey: $directional_info.src_node_id,
+                                                       lowest_fee_to_peer_through_node: total_fee,
+                                                       lowest_fee_to_node: $starting_fee_msat as u64 + new_fee,
+                                               };
+                                               if old_entry.0 > total_fee {
+                                                       targets.push(new_graph_node);
+                                                       old_entry.0 = total_fee;
+                                                       old_entry.3 = RouteHop {
+                                                               pubkey: $dest_node_id.clone(),
+                                                               node_features: NodeFeatures::empty(),
+                                                               short_channel_id: $chan_id.clone(),
+                                                               channel_features: $chan_features.clone(),
+                                                               fee_msat: new_fee, // This field is ignored on the last-hop anyway
+                                                               cltv_expiry_delta: $directional_info.cltv_expiry_delta as u32,
+                                                       }
+                                               }
+                                       }
+                               }
+                       };
+               }
+
+               macro_rules! add_entries_to_cheapest_to_target_node {
+                       ( $node: expr, $node_id: expr, $fee_to_target_msat: expr ) => {
+                               if first_hops.is_some() {
+                                       if let Some(&(ref first_hop, ref features)) = first_hop_targets.get(&$node_id) {
+                                               add_entry!(first_hop, $node_id, dummy_directional_info, features.to_context(), $fee_to_target_msat);
+                                       }
+                               }
+
+                               if !$node.features.requires_unknown_bits() {
+                                       for chan_id in $node.channels.iter() {
+                                               let chan = network.channels.get(chan_id).unwrap();
+                                               if !chan.features.requires_unknown_bits() {
+                                                       if chan.one_to_two.src_node_id == *$node_id {
+                                                               // ie $node is one, ie next hop in A* is two, via the two_to_one channel
+                                                               if first_hops.is_none() || chan.two_to_one.src_node_id != network.our_node_id {
+                                                                       if chan.two_to_one.enabled {
+                                                                               add_entry!(chan_id, chan.one_to_two.src_node_id, chan.two_to_one, chan.features, $fee_to_target_msat);
+                                                                       }
+                                                               }
+                                                       } else {
+                                                               if first_hops.is_none() || chan.one_to_two.src_node_id != network.our_node_id {
+                                                                       if chan.one_to_two.enabled {
+                                                                               add_entry!(chan_id, chan.two_to_one.src_node_id, chan.one_to_two, chan.features, $fee_to_target_msat);
+                                                                       }
+                                                               }
+                                                       }
+                                               }
+                                       }
+                               }
+                       };
+               }
+
+               match network.nodes.get(target) {
+                       None => {},
+                       Some(node) => {
+                               add_entries_to_cheapest_to_target_node!(node, target, 0);
+                       },
+               }
+
+               for hop in last_hops.iter() {
+                       if first_hops.is_none() || hop.src_node_id != network.our_node_id { // first_hop overrules last_hops
+                               if network.nodes.get(&hop.src_node_id).is_some() {
+                                       if first_hops.is_some() {
+                                               if let Some(&(ref first_hop, ref features)) = first_hop_targets.get(&hop.src_node_id) {
+                                                       // Currently there are no channel-context features defined, so we are a
+                                                       // bit lazy here. In the future, we should pull them out via our
+                                                       // ChannelManager, but there's no reason to waste the space until we
+                                                       // need them.
+                                                       add_entry!(first_hop, hop.src_node_id, dummy_directional_info, features.to_context(), 0);
+                                               }
+                                       }
+                                       // BOLT 11 doesn't allow inclusion of features for the last hop hints, which
+                                       // really sucks, cause we're gonna need that eventually.
+                                       add_entry!(hop.short_channel_id, target, hop, ChannelFeatures::empty(), 0);
+                               }
+                       }
+               }
+
+               while let Some(RouteGraphNode { pubkey, lowest_fee_to_node, .. }) = targets.pop() {
+                       if pubkey == network.our_node_id {
+                               let mut res = vec!(dist.remove(&network.our_node_id).unwrap().3);
+                               loop {
+                                       if let Some(&(_, ref features)) = first_hop_targets.get(&res.last().unwrap().pubkey) {
+                                               res.last_mut().unwrap().node_features = features.to_context();
+                                       } else if let Some(node) = network.nodes.get(&res.last().unwrap().pubkey) {
+                                               res.last_mut().unwrap().node_features = node.features.clone();
+                                       } else {
+                                               // We should be able to fill in features for everything except the last
+                                               // hop, if the last hop was provided via a BOLT 11 invoice (though we
+                                               // should be able to extend it further as BOLT 11 does have feature
+                                               // flags for the last hop node itself).
+                                               assert!(res.last().unwrap().pubkey == *target);
+                                       }
+                                       if res.last().unwrap().pubkey == *target {
+                                               break;
+                                       }
+
+                                       let new_entry = match dist.remove(&res.last().unwrap().pubkey) {
+                                               Some(hop) => hop.3,
+                                               None => return Err(LightningError{err: "Failed to find a non-fee-overflowing path to the given destination", action: ErrorAction::IgnoreError}),
+                                       };
+                                       res.last_mut().unwrap().fee_msat = new_entry.fee_msat;
+                                       res.last_mut().unwrap().cltv_expiry_delta = new_entry.cltv_expiry_delta;
+                                       res.push(new_entry);
+                               }
+                               res.last_mut().unwrap().fee_msat = final_value_msat;
+                               res.last_mut().unwrap().cltv_expiry_delta = final_cltv;
+                               let route = Route { paths: vec![res] };
+                               log_trace!(self, "Got route: {}", log_route!(route));
+                               return Ok(route);
+                       }
+
+                       match network.nodes.get(&pubkey) {
+                               None => {},
+                               Some(node) => {
+                                       add_entries_to_cheapest_to_target_node!(node, &pubkey, lowest_fee_to_node);
+                               },
+                       }
+               }
+
+               Err(LightningError{err: "Failed to find a path to the given destination", action: ErrorAction::IgnoreError})
+       }
+}
+
+#[cfg(test)]
+mod tests {
+       use chain::chaininterface;
+       use ln::channelmanager;
+       use routing::router::{Router,NodeInfo,NetworkMap,ChannelInfo,DirectionalChannelInfo,RouteHint};
+       use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};
+       use ln::msgs::{ErrorAction, LightningError, RoutingMessageHandler, UnsignedNodeAnnouncement, NodeAnnouncement,
+          UnsignedChannelAnnouncement, ChannelAnnouncement, UnsignedChannelUpdate, ChannelUpdate, HTLCFailChannelUpdate};
+       use util::test_utils;
+       use util::test_utils::TestVecWriter;
+       use util::logger::Logger;
+       use util::ser::{Writeable, Readable};
+
+       use bitcoin::hashes::sha256d::Hash as Sha256dHash;
+       use bitcoin::hashes::Hash;
+       use bitcoin::hash_types::BlockHash;
+       use bitcoin::network::constants::Network;
+       use bitcoin::blockdata::constants::genesis_block;
+       use bitcoin::blockdata::script::Builder;
+       use bitcoin::blockdata::opcodes;
+       use bitcoin::util::hash::BitcoinHash;
+
+       use hex;
+
+       use bitcoin::secp256k1::key::{PublicKey,SecretKey};
+       use bitcoin::secp256k1::All;
+       use bitcoin::secp256k1::Secp256k1;
+
+       use std::sync::Arc;
+       use std::collections::btree_map::Entry as BtreeEntry;
+
+       fn create_router() -> (Secp256k1<All>, PublicKey, Router) {
+               let secp_ctx = Secp256k1::new();
+               let our_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap());
+               let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
+               let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
+               let router = Router::new(our_id, chain_monitor, Arc::clone(&logger));
+               (secp_ctx, our_id, router)
+       }
+
+       #[test]
+       fn route_test() {
+               let (secp_ctx, our_id, router) = create_router();
+
+               // Build network from our_id to node8:
+               //
+               //        -1(1)2-  node1  -1(3)2-
+               //       /                       \
+               // our_id -1(12)2- node8 -1(13)2--- node3
+               //       \                       /
+               //        -1(2)2-  node2  -1(4)2-
+               //
+               //
+               // chan1  1-to-2: disabled
+               // chan1  2-to-1: enabled, 0 fee
+               //
+               // chan2  1-to-2: enabled, ignored fee
+               // chan2  2-to-1: enabled, 0 fee
+               //
+               // chan3  1-to-2: enabled, 0 fee
+               // chan3  2-to-1: enabled, 100 msat fee
+               //
+               // chan4  1-to-2: enabled, 100% fee
+               // chan4  2-to-1: enabled, 0 fee
+               //
+               // chan12 1-to-2: enabled, ignored fee
+               // chan12 2-to-1: enabled, 0 fee
+               //
+               // chan13 1-to-2: enabled, 200% fee
+               // chan13 2-to-1: enabled, 0 fee
+               //
+               //
+               //       -1(5)2- node4 -1(8)2--
+               //       |         2          |
+               //       |       (11)         |
+               //      /          1           \
+               // node3--1(6)2- node5 -1(9)2--- node7 (not in global route map)
+               //      \                      /
+               //       -1(7)2- node6 -1(10)2-
+               //
+               // chan5  1-to-2: enabled, 100 msat fee
+               // chan5  2-to-1: enabled, 0 fee
+               //
+               // chan6  1-to-2: enabled, 0 fee
+               // chan6  2-to-1: enabled, 0 fee
+               //
+               // chan7  1-to-2: enabled, 100% fee
+               // chan7  2-to-1: enabled, 0 fee
+               //
+               // chan8  1-to-2: enabled, variable fee (0 then 1000 msat)
+               // chan8  2-to-1: enabled, 0 fee
+               //
+               // chan9  1-to-2: enabled, 1001 msat fee
+               // chan9  2-to-1: enabled, 0 fee
+               //
+               // chan10 1-to-2: enabled, 0 fee
+               // chan10 2-to-1: enabled, 0 fee
+               //
+               // chan11 1-to-2: enabled, 0 fee
+               // chan11 2-to-1: enabled, 0 fee
+
+               let node1 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()[..]).unwrap());
+               let node2 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()[..]).unwrap());
+               let node3 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap()[..]).unwrap());
+               let node4 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()[..]).unwrap());
+               let node5 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0606060606060606060606060606060606060606060606060606060606060606").unwrap()[..]).unwrap());
+               let node6 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0707070707070707070707070707070707070707070707070707070707070707").unwrap()[..]).unwrap());
+               let node7 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0808080808080808080808080808080808080808080808080808080808080808").unwrap()[..]).unwrap());
+               let node8 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0909090909090909090909090909090909090909090909090909090909090909").unwrap()[..]).unwrap());
+
+               let zero_hash = BlockHash::hash(&[0; 32]);
+
+               macro_rules! id_to_feature_flags {
+                       // Set the feature flags to the id'th odd (ie non-required) feature bit so that we can
+                       // test for it later.
+                       ($id: expr) => { {
+                               let idx = ($id - 1) * 2 + 1;
+                               if idx > 8*3 {
+                                       vec![1 << (idx - 8*3), 0, 0, 0]
+                               } else if idx > 8*2 {
+                                       vec![1 << (idx - 8*2), 0, 0]
+                               } else if idx > 8*1 {
+                                       vec![1 << (idx - 8*1), 0]
+                               } else {
+                                       vec![1 << idx]
+                               }
+                       } }
+               }
+
+               {
+                       let mut network = router.network_map.write().unwrap();
+
+                       network.nodes.insert(node1.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(1, zero_hash.clone()), NetworkMap::get_key(3, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 100,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(1)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(1, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(1)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: our_id.clone(),
+                                       last_update: 0,
+                                       enabled: false,
+                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: u32::max_value(), // This value should be ignored
+                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node1.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: 0,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node2.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(2, zero_hash.clone()), NetworkMap::get_key(4, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(2)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(2, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(2)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: our_id.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: u32::max_value(), // This value should be ignored
+                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node2.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: 0,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node8.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(12, zero_hash.clone()), NetworkMap::get_key(13, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(8)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(12, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(12)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: our_id.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: u16::max_value(), // This value should be ignored
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: u32::max_value(), // This value should be ignored
+                                       fee_proportional_millionths: u32::max_value(), // This value should be ignored
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node8.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: 0,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node3.clone(), NodeInfo {
+                               channels: vec!(
+                                       NetworkMap::get_key(3, zero_hash.clone()),
+                                       NetworkMap::get_key(4, zero_hash.clone()),
+                                       NetworkMap::get_key(13, zero_hash.clone()),
+                                       NetworkMap::get_key(5, zero_hash.clone()),
+                                       NetworkMap::get_key(6, zero_hash.clone()),
+                                       NetworkMap::get_key(7, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(3)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(3, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(3)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node1.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (3 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (3 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 100,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(4, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(4)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node2.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (4 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 1000000,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (4 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(13, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(13)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node8.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (13 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 2000000,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (13 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node4.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(5, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(4)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(5, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(5)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (5 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 100,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node4.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (5 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node5.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(6, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(5)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(6, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(6)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (6 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node5.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (6 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(11, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(11)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node5.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (11 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node4.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (11 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+                       network.nodes.insert(node6.clone(), NodeInfo {
+                               channels: vec!(NetworkMap::get_key(7, zero_hash.clone())),
+                               lowest_inbound_channel_fee_base_msat: 0,
+                               lowest_inbound_channel_fee_proportional_millionths: 0,
+                               features: NodeFeatures::from_le_bytes(id_to_feature_flags!(6)),
+                               last_update: Some(1),
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               announcement_message: None,
+                       });
+                       network.channels.insert(NetworkMap::get_key(7, zero_hash.clone()), ChannelInfo {
+                               features: ChannelFeatures::from_le_bytes(id_to_feature_flags!(7)),
+                               one_to_two: DirectionalChannelInfo {
+                                       src_node_id: node3.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (7 << 8) | 1,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 1000000,
+                                       last_update_message: None,
+                               }, two_to_one: DirectionalChannelInfo {
+                                       src_node_id: node6.clone(),
+                                       last_update: 0,
+                                       enabled: true,
+                                       cltv_expiry_delta: (7 << 8) | 2,
+                                       htlc_minimum_msat: 0,
+                                       fee_base_msat: 0,
+                                       fee_proportional_millionths: 0,
+                                       last_update_message: None,
+                               },
+                               announcement_message: None,
+                       });
+               }
+
+               { // Simple route to 3 via 2
+                       let route = router.get_route(&node3, None, &Vec::new(), 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 2);
+
+                       assert_eq!(route.paths[0][0].pubkey, node2);
+                       assert_eq!(route.paths[0][0].short_channel_id, 2);
+                       assert_eq!(route.paths[0][0].fee_msat, 100);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 4);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
+               }
+
+               { // Disable channels 4 and 12 by requiring unknown feature bits
+                       let mut network = router.network_map.write().unwrap();
+                       network.channels.get_mut(&NetworkMap::get_key(4, zero_hash.clone())).unwrap().features.set_required_unknown_bits();
+                       network.channels.get_mut(&NetworkMap::get_key(12, zero_hash.clone())).unwrap().features.set_required_unknown_bits();
+               }
+
+               { // If all the channels require some features we don't understand, route should fail
+                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = router.get_route(&node3, None, &Vec::new(), 100, 42) {
+                               assert_eq!(err, "Failed to find a path to the given destination");
+                       } else { panic!(); }
+               }
+
+               { // If we specify a channel to node8, that overrides our local channel view and that gets used
+                       let our_chans = vec![channelmanager::ChannelDetails {
+                               channel_id: [0; 32],
+                               short_channel_id: Some(42),
+                               remote_network_id: node8.clone(),
+                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
+                               channel_value_satoshis: 0,
+                               user_id: 0,
+                               outbound_capacity_msat: 0,
+                               inbound_capacity_msat: 0,
+                               is_live: true,
+                       }];
+                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 2);
+
+                       assert_eq!(route.paths[0][0].pubkey, node8);
+                       assert_eq!(route.paths[0][0].short_channel_id, 42);
+                       assert_eq!(route.paths[0][0].fee_msat, 200);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 13);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
+               }
+
+               { // Re-enable channels 4 and 12 by wiping the unknown feature bits
+                       let mut network = router.network_map.write().unwrap();
+                       network.channels.get_mut(&NetworkMap::get_key(4, zero_hash.clone())).unwrap().features.clear_unknown_bits();
+                       network.channels.get_mut(&NetworkMap::get_key(12, zero_hash.clone())).unwrap().features.clear_unknown_bits();
+               }
+
+               { // Disable nodes 1, 2, and 8 by requiring unknown feature bits
+                       let mut network = router.network_map.write().unwrap();
+                       network.nodes.get_mut(&node1).unwrap().features.set_required_unknown_bits();
+                       network.nodes.get_mut(&node2).unwrap().features.set_required_unknown_bits();
+                       network.nodes.get_mut(&node8).unwrap().features.set_required_unknown_bits();
+               }
+
+               { // If all nodes require some features we don't understand, route should fail
+                       if let Err(LightningError{err, action: ErrorAction::IgnoreError}) = router.get_route(&node3, None, &Vec::new(), 100, 42) {
+                               assert_eq!(err, "Failed to find a path to the given destination");
+                       } else { panic!(); }
+               }
+
+               { // If we specify a channel to node8, that overrides our local channel view and that gets used
+                       let our_chans = vec![channelmanager::ChannelDetails {
+                               channel_id: [0; 32],
+                               short_channel_id: Some(42),
+                               remote_network_id: node8.clone(),
+                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
+                               channel_value_satoshis: 0,
+                               user_id: 0,
+                               outbound_capacity_msat: 0,
+                               inbound_capacity_msat: 0,
+                               is_live: true,
+                       }];
+                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 2);
+
+                       assert_eq!(route.paths[0][0].pubkey, node8);
+                       assert_eq!(route.paths[0][0].short_channel_id, 42);
+                       assert_eq!(route.paths[0][0].fee_msat, 200);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]); // it should also override our view of their features
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 13);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
+               }
+
+               { // Re-enable nodes 1, 2, and 8
+                       let mut network = router.network_map.write().unwrap();
+                       network.nodes.get_mut(&node1).unwrap().features.clear_unknown_bits();
+                       network.nodes.get_mut(&node2).unwrap().features.clear_unknown_bits();
+                       network.nodes.get_mut(&node8).unwrap().features.clear_unknown_bits();
+               }
+
+               // Note that we don't test disabling node 3 and failing to route to it, as we (somewhat
+               // naively) assume that the user checked the feature bits on the invoice, which override
+               // the node_announcement.
+
+               { // Route to 1 via 2 and 3 because our channel to 1 is disabled
+                       let route = router.get_route(&node1, None, &Vec::new(), 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 3);
+
+                       assert_eq!(route.paths[0][0].pubkey, node2);
+                       assert_eq!(route.paths[0][0].short_channel_id, 2);
+                       assert_eq!(route.paths[0][0].fee_msat, 200);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 4);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (3 << 8) | 2);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
+
+                       assert_eq!(route.paths[0][2].pubkey, node1);
+                       assert_eq!(route.paths[0][2].short_channel_id, 3);
+                       assert_eq!(route.paths[0][2].fee_msat, 100);
+                       assert_eq!(route.paths[0][2].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(1));
+                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(3));
+               }
+
+               { // If we specify a channel to node8, that overrides our local channel view and that gets used
+                       let our_chans = vec![channelmanager::ChannelDetails {
+                               channel_id: [0; 32],
+                               short_channel_id: Some(42),
+                               remote_network_id: node8.clone(),
+                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
+                               channel_value_satoshis: 0,
+                               user_id: 0,
+                               outbound_capacity_msat: 0,
+                               inbound_capacity_msat: 0,
+                               is_live: true,
+                       }];
+                       let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 2);
+
+                       assert_eq!(route.paths[0][0].pubkey, node8);
+                       assert_eq!(route.paths[0][0].short_channel_id, 42);
+                       assert_eq!(route.paths[0][0].fee_msat, 200);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (13 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 13);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(13));
+               }
+
+               let mut last_hops = vec!(RouteHint {
+                               src_node_id: node4.clone(),
+                               short_channel_id: 8,
+                               fee_base_msat: 0,
+                               fee_proportional_millionths: 0,
+                               cltv_expiry_delta: (8 << 8) | 1,
+                               htlc_minimum_msat: 0,
+                       }, RouteHint {
+                               src_node_id: node5.clone(),
+                               short_channel_id: 9,
+                               fee_base_msat: 1001,
+                               fee_proportional_millionths: 0,
+                               cltv_expiry_delta: (9 << 8) | 1,
+                               htlc_minimum_msat: 0,
+                       }, RouteHint {
+                               src_node_id: node6.clone(),
+                               short_channel_id: 10,
+                               fee_base_msat: 0,
+                               fee_proportional_millionths: 0,
+                               cltv_expiry_delta: (10 << 8) | 1,
+                               htlc_minimum_msat: 0,
+                       });
+
+               { // Simple test across 2, 3, 5, and 4 via a last_hop channel
+                       let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 5);
+
+                       assert_eq!(route.paths[0][0].pubkey, node2);
+                       assert_eq!(route.paths[0][0].short_channel_id, 2);
+                       assert_eq!(route.paths[0][0].fee_msat, 100);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 4);
+                       assert_eq!(route.paths[0][1].fee_msat, 0);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (6 << 8) | 1);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
+
+                       assert_eq!(route.paths[0][2].pubkey, node5);
+                       assert_eq!(route.paths[0][2].short_channel_id, 6);
+                       assert_eq!(route.paths[0][2].fee_msat, 0);
+                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (11 << 8) | 1);
+                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(5));
+                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(6));
+
+                       assert_eq!(route.paths[0][3].pubkey, node4);
+                       assert_eq!(route.paths[0][3].short_channel_id, 11);
+                       assert_eq!(route.paths[0][3].fee_msat, 0);
+                       assert_eq!(route.paths[0][3].cltv_expiry_delta, (8 << 8) | 1);
+                       // If we have a peer in the node map, we'll use their features here since we don't have
+                       // a way of figuring out their features from the invoice:
+                       assert_eq!(route.paths[0][3].node_features.le_flags(), &id_to_feature_flags!(4));
+                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &id_to_feature_flags!(11));
+
+                       assert_eq!(route.paths[0][4].pubkey, node7);
+                       assert_eq!(route.paths[0][4].short_channel_id, 8);
+                       assert_eq!(route.paths[0][4].fee_msat, 100);
+                       assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
+                       assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+               }
+
+               { // Simple test with outbound channel to 4 to test that last_hops and first_hops connect
+                       let our_chans = vec![channelmanager::ChannelDetails {
+                               channel_id: [0; 32],
+                               short_channel_id: Some(42),
+                               remote_network_id: node4.clone(),
+                               counterparty_features: InitFeatures::from_le_bytes(vec![0b11]),
+                               channel_value_satoshis: 0,
+                               user_id: 0,
+                               outbound_capacity_msat: 0,
+                               inbound_capacity_msat: 0,
+                               is_live: true,
+                       }];
+                       let route = router.get_route(&node7, Some(&our_chans), &last_hops, 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 2);
+
+                       assert_eq!(route.paths[0][0].pubkey, node4);
+                       assert_eq!(route.paths[0][0].short_channel_id, 42);
+                       assert_eq!(route.paths[0][0].fee_msat, 0);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (8 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &vec![0b11]);
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &Vec::new()); // No feature flags will meet the relevant-to-channel conversion
+
+                       assert_eq!(route.paths[0][1].pubkey, node7);
+                       assert_eq!(route.paths[0][1].short_channel_id, 8);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+               }
+
+               last_hops[0].fee_base_msat = 1000;
+
+               { // Revert to via 6 as the fee on 8 goes up
+                       let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 4);
+
+                       assert_eq!(route.paths[0][0].pubkey, node2);
+                       assert_eq!(route.paths[0][0].short_channel_id, 2);
+                       assert_eq!(route.paths[0][0].fee_msat, 200); // fee increased as its % of value transferred across node
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 4);
+                       assert_eq!(route.paths[0][1].fee_msat, 100);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (7 << 8) | 1);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
+
+                       assert_eq!(route.paths[0][2].pubkey, node6);
+                       assert_eq!(route.paths[0][2].short_channel_id, 7);
+                       assert_eq!(route.paths[0][2].fee_msat, 0);
+                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (10 << 8) | 1);
+                       // If we have a peer in the node map, we'll use their features here since we don't have
+                       // a way of figuring out their features from the invoice:
+                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(6));
+                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(7));
+
+                       assert_eq!(route.paths[0][3].pubkey, node7);
+                       assert_eq!(route.paths[0][3].short_channel_id, 10);
+                       assert_eq!(route.paths[0][3].fee_msat, 100);
+                       assert_eq!(route.paths[0][3].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][3].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
+                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+               }
+
+               { // ...but still use 8 for larger payments as 6 has a variable feerate
+                       let route = router.get_route(&node7, None, &last_hops, 2000, 42).unwrap();
+                       assert_eq!(route.paths[0].len(), 5);
+
+                       assert_eq!(route.paths[0][0].pubkey, node2);
+                       assert_eq!(route.paths[0][0].short_channel_id, 2);
+                       assert_eq!(route.paths[0][0].fee_msat, 3000);
+                       assert_eq!(route.paths[0][0].cltv_expiry_delta, (4 << 8) | 1);
+                       assert_eq!(route.paths[0][0].node_features.le_flags(), &id_to_feature_flags!(2));
+                       assert_eq!(route.paths[0][0].channel_features.le_flags(), &id_to_feature_flags!(2));
+
+                       assert_eq!(route.paths[0][1].pubkey, node3);
+                       assert_eq!(route.paths[0][1].short_channel_id, 4);
+                       assert_eq!(route.paths[0][1].fee_msat, 0);
+                       assert_eq!(route.paths[0][1].cltv_expiry_delta, (6 << 8) | 1);
+                       assert_eq!(route.paths[0][1].node_features.le_flags(), &id_to_feature_flags!(3));
+                       assert_eq!(route.paths[0][1].channel_features.le_flags(), &id_to_feature_flags!(4));
+
+                       assert_eq!(route.paths[0][2].pubkey, node5);
+                       assert_eq!(route.paths[0][2].short_channel_id, 6);
+                       assert_eq!(route.paths[0][2].fee_msat, 0);
+                       assert_eq!(route.paths[0][2].cltv_expiry_delta, (11 << 8) | 1);
+                       assert_eq!(route.paths[0][2].node_features.le_flags(), &id_to_feature_flags!(5));
+                       assert_eq!(route.paths[0][2].channel_features.le_flags(), &id_to_feature_flags!(6));
+
+                       assert_eq!(route.paths[0][3].pubkey, node4);
+                       assert_eq!(route.paths[0][3].short_channel_id, 11);
+                       assert_eq!(route.paths[0][3].fee_msat, 1000);
+                       assert_eq!(route.paths[0][3].cltv_expiry_delta, (8 << 8) | 1);
+                       // If we have a peer in the node map, we'll use their features here since we don't have
+                       // a way of figuring out their features from the invoice:
+                       assert_eq!(route.paths[0][3].node_features.le_flags(), &id_to_feature_flags!(4));
+                       assert_eq!(route.paths[0][3].channel_features.le_flags(), &id_to_feature_flags!(11));
+
+                       assert_eq!(route.paths[0][4].pubkey, node7);
+                       assert_eq!(route.paths[0][4].short_channel_id, 8);
+                       assert_eq!(route.paths[0][4].fee_msat, 2000);
+                       assert_eq!(route.paths[0][4].cltv_expiry_delta, 42);
+                       assert_eq!(route.paths[0][4].node_features.le_flags(), &Vec::new()); // We dont pass flags in from invoices yet
+                       assert_eq!(route.paths[0][4].channel_features.le_flags(), &Vec::new()); // We can't learn any flags from invoices, sadly
+               }
+
+               { // Test Router serialization/deserialization
+                       let mut w = TestVecWriter(Vec::new());
+                       let network = router.network_map.read().unwrap();
+                       assert!(!network.channels.is_empty());
+                       assert!(!network.nodes.is_empty());
+                       network.write(&mut w).unwrap();
+                       assert!(<NetworkMap>::read(&mut ::std::io::Cursor::new(&w.0)).unwrap() == *network);
+               }
+       }
+
+       #[test]
+       fn request_full_sync_finite_times() {
+               let (secp_ctx, _, router) = create_router();
+               let node_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()[..]).unwrap());
+
+               assert!(router.should_request_full_sync(&node_id));
+               assert!(router.should_request_full_sync(&node_id));
+               assert!(router.should_request_full_sync(&node_id));
+               assert!(router.should_request_full_sync(&node_id));
+               assert!(router.should_request_full_sync(&node_id));
+               assert!(!router.should_request_full_sync(&node_id));
+       }
+
+       #[test]
+       fn handling_node_announcements() {
+               let (secp_ctx, _, router) = create_router();
+
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+               let zero_hash = Sha256dHash::hash(&[0; 32]);
+               let first_announcement_time = 500;
+
+               let mut unsigned_announcement = UnsignedNodeAnnouncement {
+                       features: NodeFeatures::known(),
+                       timestamp: first_announcement_time,
+                       node_id: node_id_1,
+                       rgb: [0; 3],
+                       alias: [0; 32],
+                       addresses: Vec::new(),
+                       excess_address_data: Vec::new(),
+                       excess_data: Vec::new(),
+               };
+               let mut msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = NodeAnnouncement {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_announcement.clone()
+               };
+
+               match router.handle_node_announcement(&valid_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!("No existing channels for node_announcement", e.err)
+               };
+
+               {
+                       // Announce a channel to add a corresponding node.
+                       let unsigned_announcement = UnsignedChannelAnnouncement {
+                               features: ChannelFeatures::known(),
+                               chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
+                               short_channel_id: 0,
+                               node_id_1,
+                               node_id_2,
+                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                               excess_data: Vec::new(),
+                       };
+
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_announcement = ChannelAnnouncement {
+                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                               contents: unsigned_announcement.clone(),
+                       };
+                       match router.handle_channel_announcement(&valid_announcement) {
+                               Ok(res) => assert!(res),
+                               _ => panic!()
+                       };
+               }
+
+               match router.handle_node_announcement(&valid_announcement) {
+                       Ok(res) => assert!(res),
+                       Err(_) => panic!()
+               };
+
+               let fake_msghash = hash_to_message!(&zero_hash);
+               match router.handle_node_announcement(
+                       &NodeAnnouncement {
+                               signature: secp_ctx.sign(&fake_msghash, node_1_privkey),
+                               contents: unsigned_announcement.clone()
+               }) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
+               };
+
+               unsigned_announcement.timestamp += 1000;
+               unsigned_announcement.excess_data.push(1);
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let announcement_with_data = NodeAnnouncement {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_announcement.clone()
+               };
+               // Return false because contains excess data.
+               match router.handle_node_announcement(&announcement_with_data) {
+                       Ok(res) => assert!(!res),
+                       Err(_) => panic!()
+               };
+               unsigned_announcement.excess_data = Vec::new();
+
+               // Even though previous announcement was not relayed further, we still accepted it,
+               // so we now won't accept announcements before the previous one.
+               unsigned_announcement.timestamp -= 10;
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let outdated_announcement = NodeAnnouncement {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_announcement.clone()
+               };
+               match router.handle_node_announcement(&outdated_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Update older than last processed update")
+               };
+       }
+
+       #[test]
+       fn handling_channel_announcements() {
+               let secp_ctx = Secp256k1::new();
+               let our_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(
+                  &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap());
+               let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
+               let chain_monitor = Arc::new(test_utils::TestChainWatcher::new());
+               let router = Router::new(our_id, chain_monitor.clone(), Arc::clone(&logger));
+
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+
+               let good_script = Builder::new().push_opcode(opcodes::all::OP_PUSHNUM_2)
+                  .push_slice(&PublicKey::from_secret_key(&secp_ctx, node_1_btckey).serialize())
+                  .push_slice(&PublicKey::from_secret_key(&secp_ctx, node_2_btckey).serialize())
+                  .push_opcode(opcodes::all::OP_PUSHNUM_2)
+                  .push_opcode(opcodes::all::OP_CHECKMULTISIG).into_script().to_v0_p2wsh();
+
+
+               let mut unsigned_announcement = UnsignedChannelAnnouncement {
+                       features: ChannelFeatures::known(),
+                       chain_hash: genesis_block(Network::Testnet).header.bitcoin_hash(),
+                       short_channel_id: 0,
+                       node_id_1,
+                       node_id_2,
+                       bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                       bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                       excess_data: Vec::new(),
+               };
+
+               let channel_key = NetworkMap::get_key(unsigned_announcement.short_channel_id,
+                                                   unsigned_announcement.chain_hash);
+
+               let mut msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+
+               // Test if the UTXO lookups were not supported
+               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::NotSupported);
+
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(res) => assert!(res),
+                       _ => panic!()
+               };
+               {
+                       let network = router.network_map.write().unwrap();
+                       match network.channels.get(&channel_key) {
+                               None => panic!(),
+                               Some(_) => ()
+                       }
+               }
+
+               // If we receive announcement for the same channel (with UTXO lookups disabled),
+               // drop new one on the floor, since we can't see any changes.
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Already have knowledge of channel")
+               };
+
+
+               // Test if an associated transaction were not on-chain (or not confirmed).
+               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::UnknownTx);
+               unsigned_announcement.short_channel_id += 1;
+
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Channel announced without corresponding UTXO entry")
+               };
+
+
+               // Now test if the transaction is found in the UTXO set and the script is correct.
+               unsigned_announcement.short_channel_id += 1;
+               *chain_monitor.utxo_ret.lock().unwrap() = Ok((good_script.clone(), 0));
+               let channel_key = NetworkMap::get_key(unsigned_announcement.short_channel_id,
+                                                  unsigned_announcement.chain_hash);
+
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(res) => assert!(res),
+                       _ => panic!()
+               };
+               {
+                       let network = router.network_map.write().unwrap();
+                       match network.channels.get(&channel_key) {
+                               None => panic!(),
+                               Some(_) => ()
+                       }
+               }
+
+               // If we receive announcement for the same channel (but TX is not confirmed),
+               // drop new one on the floor, since we can't see any changes.
+               *chain_monitor.utxo_ret.lock().unwrap() = Err(chaininterface::ChainError::UnknownTx);
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Channel announced without corresponding UTXO entry")
+               };
+
+               // But if it is confirmed, replace the channel
+               *chain_monitor.utxo_ret.lock().unwrap() = Ok((good_script, 0));
+               unsigned_announcement.features = ChannelFeatures::empty();
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(res) => assert!(res),
+                       _ => panic!()
+               };
+               {
+                       let mut network = router.network_map.write().unwrap();
+                       match network.channels.entry(channel_key) {
+                               BtreeEntry::Occupied(channel_entry) => {
+                                       assert_eq!(channel_entry.get().features, ChannelFeatures::empty());
+                               },
+                               _ => panic!()
+                       }
+               }
+
+               // Don't relay valid channels with excess data
+               unsigned_announcement.short_channel_id += 1;
+               unsigned_announcement.excess_data.push(1);
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let valid_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+               match router.handle_channel_announcement(&valid_announcement) {
+                       Ok(res) => assert!(!res),
+                       _ => panic!()
+               };
+
+               unsigned_announcement.excess_data = Vec::new();
+               let invalid_sig_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_1_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+               match router.handle_channel_announcement(&invalid_sig_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
+               };
+
+               unsigned_announcement.node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+               let channel_to_itself_announcement = ChannelAnnouncement {
+                       node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                       node_signature_2: secp_ctx.sign(&msghash, node_1_privkey),
+                       bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                       bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                       contents: unsigned_announcement.clone(),
+               };
+               match router.handle_channel_announcement(&channel_to_itself_announcement) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Channel announcement node had a channel with itself")
+               };
+       }
+
+       #[test]
+       fn handling_channel_update() {
+               let (secp_ctx, _, router) = create_router();
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+
+               let zero_hash = Sha256dHash::hash(&[0; 32]);
+               let short_channel_id = 0;
+               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
+               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
+
+
+               {
+                       // Announce a channel we will update
+                       let unsigned_announcement = UnsignedChannelAnnouncement {
+                               features: ChannelFeatures::empty(),
+                               chain_hash,
+                               short_channel_id,
+                               node_id_1,
+                               node_id_2,
+                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                               excess_data: Vec::new(),
+                       };
+
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_channel_announcement = ChannelAnnouncement {
+                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                               contents: unsigned_announcement.clone(),
+                       };
+                       match router.handle_channel_announcement(&valid_channel_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+
+               }
+
+               let mut unsigned_channel_update = UnsignedChannelUpdate {
+                       chain_hash,
+                       short_channel_id,
+                       timestamp: 100,
+                       flags: 0,
+                       cltv_expiry_delta: 144,
+                       htlc_minimum_msat: 1000000,
+                       fee_base_msat: 10000,
+                       fee_proportional_millionths: 20,
+                       excess_data: Vec::new()
+               };
+               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+               let valid_channel_update = ChannelUpdate {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_channel_update.clone()
+               };
+
+               match router.handle_channel_update(&valid_channel_update) {
+                       Ok(res) => assert!(res),
+                       _ => panic!()
+               };
+
+               {
+                       let network = router.network_map.write().unwrap();
+                       match network.channels.get(&channel_key) {
+                               None => panic!(),
+                               Some(channel_info) => {
+                                       assert_eq!(channel_info.one_to_two.cltv_expiry_delta, 144);
+                                       assert_eq!(channel_info.two_to_one.cltv_expiry_delta, u16::max_value());
+                               }
+                       }
+               }
+
+               unsigned_channel_update.timestamp += 100;
+               unsigned_channel_update.excess_data.push(1);
+               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+               let valid_channel_update = ChannelUpdate {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_channel_update.clone()
+               };
+               // Return false because contains excess data
+               match router.handle_channel_update(&valid_channel_update) {
+                       Ok(res) => assert!(!res),
+                       _ => panic!()
+               };
+
+               unsigned_channel_update.short_channel_id += 1;
+               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+               let valid_channel_update = ChannelUpdate {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_channel_update.clone()
+               };
+
+               match router.handle_channel_update(&valid_channel_update) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Couldn't find channel for update")
+               };
+               unsigned_channel_update.short_channel_id = short_channel_id;
+
+
+               // Even though previous update was not relayed further, we still accepted it,
+               // so we now won't accept update before the previous one.
+               unsigned_channel_update.timestamp -= 10;
+               let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+               let valid_channel_update = ChannelUpdate {
+                       signature: secp_ctx.sign(&msghash, node_1_privkey),
+                       contents: unsigned_channel_update.clone()
+               };
+
+               match router.handle_channel_update(&valid_channel_update) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Update older than last processed update")
+               };
+               unsigned_channel_update.timestamp += 500;
+
+               let fake_msghash = hash_to_message!(&zero_hash);
+               let invalid_sig_channel_update = ChannelUpdate {
+                       signature: secp_ctx.sign(&fake_msghash, node_1_privkey),
+                       contents: unsigned_channel_update.clone()
+               };
+
+               match router.handle_channel_update(&invalid_sig_channel_update) {
+                       Ok(_) => panic!(),
+                       Err(e) => assert_eq!(e.err, "Invalid signature from remote node")
+               };
+
+       }
+
+       #[test]
+       fn handling_htlc_fail_channel_update() {
+               let (secp_ctx, our_id, router) = create_router();
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+
+               let short_channel_id = 0;
+               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
+               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
+
+               {
+                       // There is only local node in the table at the beginning.
+                       let network = router.network_map.read().unwrap();
+                       assert_eq!(network.nodes.len(), 1);
+                       assert_eq!(network.nodes.contains_key(&our_id), true);
+               }
+
+               {
+                       // Announce a channel we will update
+                       let unsigned_announcement = UnsignedChannelAnnouncement {
+                               features: ChannelFeatures::empty(),
+                               chain_hash,
+                               short_channel_id,
+                               node_id_1,
+                               node_id_2,
+                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                               excess_data: Vec::new(),
+                       };
+
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_channel_announcement = ChannelAnnouncement {
+                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                               contents: unsigned_announcement.clone(),
+                       };
+                       match router.handle_channel_announcement(&valid_channel_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+
+               }
+
+               let channel_close_msg = HTLCFailChannelUpdate::ChannelClosed {
+                       short_channel_id,
+                       is_permanent: false
+               };
+
+               router.handle_htlc_fail_channel_update(&channel_close_msg);
+
+               {
+                       // Non-permanent closing just disables a channel
+                       let network = router.network_map.write().unwrap();
+                       match network.channels.get(&channel_key) {
+                               None => panic!(),
+                               Some(channel_info) => {
+                                       assert!(!channel_info.one_to_two.enabled);
+                                       assert!(!channel_info.two_to_one.enabled);
+                               }
+                       }
+               }
+
+               let channel_close_msg = HTLCFailChannelUpdate::ChannelClosed {
+                       short_channel_id,
+                       is_permanent: true
+               };
+
+               router.handle_htlc_fail_channel_update(&channel_close_msg);
+
+               {
+                       // Permanent closing deletes a channel
+                       let network = router.network_map.read().unwrap();
+                       assert_eq!(network.channels.len(), 0);
+                       // Nodes are also deleted because there are no associated channels anymore
+                       // Only the local node remains in the table.
+                       assert_eq!(network.nodes.len(), 1);
+                       assert_eq!(network.nodes.contains_key(&our_id), true);
+               }
+
+               // TODO: Test HTLCFailChannelUpdate::NodeFailure, which is not implemented yet.
+       }
+
+       #[test]
+       fn getting_next_channel_announcements() {
+               let (secp_ctx, _, router) = create_router();
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+
+               let short_channel_id = 1;
+               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
+               let channel_key = NetworkMap::get_key(short_channel_id, chain_hash);
+
+               // Channels were not announced yet.
+               let channels_with_announcements = router.get_next_channel_announcements(0, 1);
+               assert_eq!(channels_with_announcements.len(), 0);
+
+               {
+                       // Announce a channel we will update
+                       let unsigned_announcement = UnsignedChannelAnnouncement {
+                               features: ChannelFeatures::empty(),
+                               chain_hash,
+                               short_channel_id,
+                               node_id_1,
+                               node_id_2,
+                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                               excess_data: Vec::new(),
+                       };
+
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_channel_announcement = ChannelAnnouncement {
+                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                               contents: unsigned_announcement.clone(),
+                       };
+                       match router.handle_channel_announcement(&valid_channel_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+               }
+
+               // Contains initial channel announcement now.
+               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
+               assert_eq!(channels_with_announcements.len(), 1);
+               if let Some(channel_announcements) = channels_with_announcements.first() {
+                       let &(_, ref update_1, ref update_2) = channel_announcements;
+                       assert_eq!(update_1, &None);
+                       assert_eq!(update_2, &None);
+               } else {
+                       panic!();
+               }
+
+
+               {
+                       // Valid channel update
+                       let unsigned_channel_update = UnsignedChannelUpdate {
+                               chain_hash,
+                               short_channel_id,
+                               timestamp: 101,
+                               flags: 0,
+                               cltv_expiry_delta: 144,
+                               htlc_minimum_msat: 1000000,
+                               fee_base_msat: 10000,
+                               fee_proportional_millionths: 20,
+                               excess_data: Vec::new()
+                       };
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+                       let valid_channel_update = ChannelUpdate {
+                               signature: secp_ctx.sign(&msghash, node_1_privkey),
+                               contents: unsigned_channel_update.clone()
+                       };
+                       match router.handle_channel_update(&valid_channel_update) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+               }
+
+               // Now contains an initial announcement and an update.
+               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
+               assert_eq!(channels_with_announcements.len(), 1);
+               if let Some(channel_announcements) = channels_with_announcements.first() {
+                       let &(_, ref update_1, ref update_2) = channel_announcements;
+                       assert_ne!(update_1, &None);
+                       assert_eq!(update_2, &None);
+               } else {
+                       panic!();
+               }
+
+
+               {
+                       // Channel update with excess data.
+                       let unsigned_channel_update = UnsignedChannelUpdate {
+                               chain_hash,
+                               short_channel_id,
+                               timestamp: 102,
+                               flags: 0,
+                               cltv_expiry_delta: 144,
+                               htlc_minimum_msat: 1000000,
+                               fee_base_msat: 10000,
+                               fee_proportional_millionths: 20,
+                               excess_data: [1; 3].to_vec()
+                       };
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_channel_update.encode()[..])[..]);
+                       let valid_channel_update = ChannelUpdate {
+                               signature: secp_ctx.sign(&msghash, node_1_privkey),
+                               contents: unsigned_channel_update.clone()
+                       };
+                       match router.handle_channel_update(&valid_channel_update) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+               }
+
+               // Test that announcements with excess data won't be returned
+               let channels_with_announcements = router.get_next_channel_announcements(channel_key, 1);
+               assert_eq!(channels_with_announcements.len(), 1);
+               if let Some(channel_announcements) = channels_with_announcements.first() {
+                       let &(_, ref update_1, ref update_2) = channel_announcements;
+                       assert_eq!(update_1, &None);
+                       assert_eq!(update_2, &None);
+               } else {
+                       panic!();
+               }
+
+               // Further starting point have no channels after it
+               let channels_with_announcements = router.get_next_channel_announcements(channel_key + 1000, 1);
+               assert_eq!(channels_with_announcements.len(), 0);
+       }
+
+       #[test]
+       fn getting_next_node_announcements() {
+               let (secp_ctx, _, router) = create_router();
+               let node_1_privkey = &SecretKey::from_slice(&[42; 32]).unwrap();
+               let node_2_privkey = &SecretKey::from_slice(&[41; 32]).unwrap();
+               let node_id_1 = PublicKey::from_secret_key(&secp_ctx, node_1_privkey);
+               let node_id_2 = PublicKey::from_secret_key(&secp_ctx, node_2_privkey);
+               let node_1_btckey = &SecretKey::from_slice(&[40; 32]).unwrap();
+               let node_2_btckey = &SecretKey::from_slice(&[39; 32]).unwrap();
+
+               let short_channel_id = 1;
+               let chain_hash = genesis_block(Network::Testnet).header.bitcoin_hash();
+
+               // No nodes yet.
+               let next_announcements = router.get_next_node_announcements(None, 10);
+               assert_eq!(next_announcements.len(), 0);
+
+               {
+                       // Announce a channel to add 2 nodes
+                       let unsigned_announcement = UnsignedChannelAnnouncement {
+                               features: ChannelFeatures::empty(),
+                               chain_hash,
+                               short_channel_id,
+                               node_id_1,
+                               node_id_2,
+                               bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, node_1_btckey),
+                               bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, node_2_btckey),
+                               excess_data: Vec::new(),
+                       };
+
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_channel_announcement = ChannelAnnouncement {
+                               node_signature_1: secp_ctx.sign(&msghash, node_1_privkey),
+                               node_signature_2: secp_ctx.sign(&msghash, node_2_privkey),
+                               bitcoin_signature_1: secp_ctx.sign(&msghash, node_1_btckey),
+                               bitcoin_signature_2: secp_ctx.sign(&msghash, node_2_btckey),
+                               contents: unsigned_announcement.clone(),
+                       };
+                       match router.handle_channel_announcement(&valid_channel_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+               }
+
+
+               // Nodes were never announced
+               let next_announcements = router.get_next_node_announcements(None, 3);
+               assert_eq!(next_announcements.len(), 0);
+
+               {
+                       let mut unsigned_announcement = UnsignedNodeAnnouncement {
+                               features: NodeFeatures::known(),
+                               timestamp: 1000,
+                               node_id: node_id_1,
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               excess_address_data: Vec::new(),
+                               excess_data: Vec::new(),
+                       };
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_announcement = NodeAnnouncement {
+                               signature: secp_ctx.sign(&msghash, node_1_privkey),
+                               contents: unsigned_announcement.clone()
+                       };
+                       match router.handle_node_announcement(&valid_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+
+                       unsigned_announcement.node_id = node_id_2;
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_announcement = NodeAnnouncement {
+                               signature: secp_ctx.sign(&msghash, node_2_privkey),
+                               contents: unsigned_announcement.clone()
+                       };
+
+                       match router.handle_node_announcement(&valid_announcement) {
+                               Ok(_) => (),
+                               Err(_) => panic!()
+                       };
+               }
+
+               let next_announcements = router.get_next_node_announcements(None, 3);
+               assert_eq!(next_announcements.len(), 2);
+
+               // Skip the first node.
+               let next_announcements = router.get_next_node_announcements(Some(&node_id_1), 2);
+               assert_eq!(next_announcements.len(), 1);
+
+               {
+                       // Later announcement which should not be relayed (excess data) prevent us from sharing a node
+                       let unsigned_announcement = UnsignedNodeAnnouncement {
+                               features: NodeFeatures::known(),
+                               timestamp: 1010,
+                               node_id: node_id_2,
+                               rgb: [0; 3],
+                               alias: [0; 32],
+                               addresses: Vec::new(),
+                               excess_address_data: Vec::new(),
+                               excess_data: [1; 3].to_vec(),
+                       };
+                       let msghash = hash_to_message!(&Sha256dHash::hash(&unsigned_announcement.encode()[..])[..]);
+                       let valid_announcement = NodeAnnouncement {
+                               signature: secp_ctx.sign(&msghash, node_2_privkey),
+                               contents: unsigned_announcement.clone()
+                       };
+                       match router.handle_node_announcement(&valid_announcement) {
+                               Ok(res) => assert!(!res),
+                               Err(_) => panic!()
+                       };
+               }
+
+               let next_announcements = router.get_next_node_announcements(Some(&node_id_1), 2);
+               assert_eq!(next_announcements.len(), 0);
+
+       }
+}
index b94540446339d421fec525597d653878a647f621..bea3685b546728024bf1da7695dc9f495dcf23ff 100644 (file)
@@ -5,7 +5,7 @@ use bitcoin::hash_types::Txid;
 use bitcoin::blockdata::transaction::Transaction;
 use bitcoin::secp256k1::key::PublicKey;
 
-use ln::router::Route;
+use routing::router::Route;
 use ln::chan_utils::HTLCType;
 
 use std;