_ Git - rust-lightning/blob - src/ln/router.rs

   1 //! The top-level routing/network map tracking logic lives here.
   2 //!
   3 //! You probably want to create a Router and use that as your RoutingMessageHandler and then
   4 //! interrogate it to get routes for your own payments.
   5
   6 use secp256k1::key::PublicKey;
   7 use secp256k1::{Secp256k1,Message};
   8 use secp256k1;
   9
  10 use bitcoin::util::hash::Sha256dHash;
  11 use bitcoin::blockdata::script::Builder;
  12 use bitcoin::blockdata::opcodes;
  13
  14 use chain::chaininterface::{ChainError, ChainWatchInterface};
  15 use ln::channelmanager;
  16 use ln::msgs::{DecodeError,ErrorAction,HandleError,RoutingMessageHandler,NetAddress,GlobalFeatures, InitSyncTracker};
  17 use ln::msgs;
  18 use util::ser::{Writeable, Readable};
  19 use util::logger::Logger;
  20
  21 use std::cmp;
  22 use std::sync::{RwLock,Arc};
  23 use std::collections::{HashMap,BinaryHeap, BTreeMap};
  24 use std::collections::btree_map::Entry as BtreeEntry;
  25 use std;
  26
  27 /// A hop in a route
  28 #[derive(Clone)]
  29 pub struct RouteHop {
  30         /// The node_id of the node at this hop.
  31         pub pubkey: PublicKey,
  32         /// The channel that should be used from the previous hop to reach this node.
  33         pub short_channel_id: u64,
  34         /// The fee taken on this hop. For the last hop, this should be the full value of the payment.
  35         pub fee_msat: u64,
  36         /// The CLTV delta added for this hop. For the last hop, this should be the full CLTV value
  37         /// expected at the destination, in excess of the current block height.
  38         pub cltv_expiry_delta: u32,
  39 }
  40
  41 /// A route from us through the network to a destination
  42 #[derive(Clone)]
  43 pub struct Route {
  44         /// The list of hops, NOT INCLUDING our own, where the last hop is the destination. Thus, this
  45         /// must always be at least length one. By protocol rules, this may not currently exceed 20 in
  46         /// length.
  47         pub hops: Vec<RouteHop>,
  48 }
  49
  50 impl Writeable for Route {
  51         fn write<W: ::util::ser::Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
  52                 (self.hops.len() as u8).write(writer)?;
  53                 for hop in self.hops.iter() {
  54                         hop.pubkey.write(writer)?;
  55                         hop.short_channel_id.write(writer)?;
  56                         hop.fee_msat.write(writer)?;
  57                         hop.cltv_expiry_delta.write(writer)?;
  58                 }
  59                 Ok(())
  60         }
  61 }
  62
  63 impl<R: ::std::io::Read> Readable<R> for Route {
  64         fn read(reader: &mut R) -> Result<Route, DecodeError> {
  65                 let hops_count: u8 = Readable::read(reader)?;
  66                 let mut hops = Vec::with_capacity(hops_count as usize);
  67                 for _ in 0..hops_count {
  68                         hops.push(RouteHop {
  69                                 pubkey: Readable::read(reader)?,
  70                                 short_channel_id: Readable::read(reader)?,
  71                                 fee_msat: Readable::read(reader)?,
  72                                 cltv_expiry_delta: Readable::read(reader)?,
  73                         });
  74                 }
  75                 Ok(Route {
  76                         hops
  77                 })
  78         }
  79 }
  80
  81 struct DirectionalChannelInfo {
  82         src_node_id: PublicKey,
  83         last_update: u32,
  84         enabled: bool,
  85         cltv_expiry_delta: u16,
  86         htlc_minimum_msat: u64,
  87         fee_base_msat: u32,
  88         fee_proportional_millionths: u32,
  89         last_update_message : Option<msgs::ChannelUpdate>,
  90 }
  91
  92 impl std::fmt::Display for DirectionalChannelInfo {
  93         fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
  94                 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)?;
  95                 Ok(())
  96         }
  97 }
  98
  99 struct ChannelInfo {
 100         features: GlobalFeatures,
 101         one_to_two: DirectionalChannelInfo,
 102         two_to_one: DirectionalChannelInfo,
 103         //this is cached here so we can send out it later if required by route_init_sync
 104         //keep an eye on this to see if the extra memory is a problem
 105         announcement_message : Option<msgs::ChannelAnnouncement>,
 106 }
 107
 108 impl std::fmt::Display for ChannelInfo {
 109         fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
 110                 write!(f, "features: {}, one_to_two: {}, two_to_one: {}", log_bytes!(self.features.encode()), self.one_to_two, self.two_to_one)?;
 111                 Ok(())
 112         }
 113 }
 114
 115 #[derive(PartialEq)]
 116 struct NodeInfo {
 117         #[cfg(feature = "non_bitcoin_chain_hash_routing")]
 118         channels: Vec<(u64, Sha256dHash)>,
 119         #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 120         channels: Vec<u64>,
 121
 122         lowest_inbound_channel_fee_base_msat: u32,
 123         lowest_inbound_channel_fee_proportional_millionths: u32,
 124
 125         features: GlobalFeatures,
 126         last_update: u32,
 127         rgb: [u8; 3],
 128         alias: [u8; 32],
 129         addresses: Vec<NetAddress>,
 130         //this is cached here so we can send out it later if required by route_init_sync
 131         //keep an eye on this to see if the extra memory is a problem
 132         announcement_message : Option<msgs::NodeAnnouncement>,
 133 }
 134
 135 impl std::fmt::Display for NodeInfo {
 136         fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
 137                 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[..])?;
 138                 Ok(())
 139         }
 140 }
 141
 142 struct NetworkMap {
 143         #[cfg(feature = "non_bitcoin_chain_hash_routing")]
 144         channels: BTreeMap<(u64, Sha256dHash), ChannelInfo>,
 145         #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 146         channels: BTreeMap<u64, ChannelInfo>,
 147
 148         our_node_id: PublicKey,
 149         nodes: BTreeMap<PublicKey, NodeInfo>,
 150 }
 151 struct MutNetworkMap<'a> {
 152         #[cfg(feature = "non_bitcoin_chain_hash_routing")]
 153         channels: &'a mut BTreeMap<(u64, Sha256dHash), ChannelInfo>,
 154         #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 155         channels: &'a mut BTreeMap<u64, ChannelInfo>,
 156         nodes: &'a mut BTreeMap<PublicKey, NodeInfo>,
 157 }
 158 impl NetworkMap {
 159         fn borrow_parts(&mut self) -> MutNetworkMap {
 160                 MutNetworkMap {
 161                         channels: &mut self.channels,
 162                         nodes: &mut self.nodes,
 163                 }
 164         }
 165 }
 166 impl std::fmt::Display for NetworkMap {
 167         fn fmt(&self, f: &mut std::fmt::Formatter) -> Result<(), std::fmt::Error> {
 168                 write!(f, "Node id {} network map\n[Channels]\n", log_pubkey!(self.our_node_id))?;
 169                 for (key, val) in self.channels.iter() {
 170                         write!(f, " {}: {}\n", key, val)?;
 171                 }
 172                 write!(f, "[Nodes]\n")?;
 173                 for (key, val) in self.nodes.iter() {
 174                         write!(f, " {}: {}\n", log_pubkey!(key), val)?;
 175                 }
 176                 Ok(())
 177         }
 178 }
 179
 180 impl NetworkMap {
 181         #[cfg(feature = "non_bitcoin_chain_hash_routing")]
 182         #[inline]
 183         fn get_key(short_channel_id: u64, chain_hash: Sha256dHash) -> (u64, Sha256dHash) {
 184                 (short_channel_id, chain_hash)
 185         }
 186
 187         #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 188         #[inline]
 189         fn get_key(short_channel_id: u64, _: Sha256dHash) -> u64 {
 190                 short_channel_id
 191         }
 192
 193         #[cfg(feature = "non_bitcoin_chain_hash_routing")]
 194         #[inline]
 195         fn get_short_id(id: &(u64, Sha256dHash)) -> &u64 {
 196                 &id.0
 197         }
 198
 199         #[cfg(not(feature = "non_bitcoin_chain_hash_routing"))]
 200         #[inline]
 201         fn get_short_id(id: &u64) -> &u64 {
 202                 id
 203         }
 204 }
 205
 206 /// A channel descriptor which provides a last-hop route to get_route
 207 pub struct RouteHint {
 208         /// The node_id of the non-target end of the route
 209         pub src_node_id: PublicKey,
 210         /// The short_channel_id of this channel
 211         pub short_channel_id: u64,
 212         /// The static msat-denominated fee which must be paid to use this channel
 213         pub fee_base_msat: u32,
 214         /// The dynamic proportional fee which must be paid to use this channel, denominated in
 215         /// millionths of the value being forwarded to the next hop.
 216         pub fee_proportional_millionths: u32,
 217         /// The difference in CLTV values between this node and the next node.
 218         pub cltv_expiry_delta: u16,
 219         /// The minimum value, in msat, which must be relayed to the next hop.
 220         pub htlc_minimum_msat: u64,
 221 }
 222
 223 /// Tracks a view of the network, receiving updates from peers and generating Routes to
 224 /// payment destinations.
 225 pub struct Router {
 226         secp_ctx: Secp256k1<secp256k1::VerifyOnly>,
 227         network_map: RwLock<NetworkMap>,
 228         chain_monitor: Arc<ChainWatchInterface>,
 229         logger: Arc<Logger>,
 230 }
 231
 232 macro_rules! secp_verify_sig {
 233         ( $secp_ctx: expr, $msg: expr, $sig: expr, $pubkey: expr ) => {
 234                 match $secp_ctx.verify($msg, $sig, $pubkey) {
 235                         Ok(_) => {},
 236                         Err(_) => return Err(HandleError{err: "Invalid signature from remote node", action: None}),
 237                 }
 238         };
 239 }
 240
 241 impl RoutingMessageHandler for Router {
 242         fn handle_node_announcement(&self, msg: &msgs::NodeAnnouncement) -> Result<bool, HandleError> {
 243                 let msg_hash = Message::from_slice(&Sha256dHash::from_data(&msg.contents.encode()[..])[..]).unwrap();
 244                 secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &msg.contents.node_id);
 245
 246                 if msg.contents.features.requires_unknown_bits() {
 247                         panic!("Unknown-required-features NodeAnnouncements should never deserialize!");
 248                 }
 249
 250                 let mut network = self.network_map.write().unwrap();
 251                 match network.nodes.get_mut(&msg.contents.node_id) {
 252                         None => Err(HandleError{err: "No existing channels for node_announcement", action: Some(ErrorAction::IgnoreError)}),
 253                         Some(node) => {
 254                                 if node.last_update >= msg.contents.timestamp {
 255                                         return Err(HandleError{err: "Update older than last processed update", action: Some(ErrorAction::IgnoreError)});
 256                                 }
 257
 258                                 node.features = msg.contents.features.clone();
 259                                 node.last_update = msg.contents.timestamp;
 260                                 node.rgb = msg.contents.rgb;
 261                                 node.alias = msg.contents.alias;
 262                                 node.addresses = msg.contents.addresses.clone();
 263                                 node.announcement_message = if msg.contents.excess_data.is_empty(){
 264                                         Some(msg.clone())
 265                                 }
 266                                 else{
 267                                         None
 268                                 };
 269
 270                                 Ok(msg.contents.excess_data.is_empty() && msg.contents.excess_address_data.is_empty() && !msg.contents.features.supports_unknown_bits())
 271                         }
 272                 }
 273         }
 274
 275         fn handle_channel_announcement(&self, msg: &msgs::ChannelAnnouncement) -> Result<bool, HandleError> {
 276                 if msg.contents.node_id_1 == msg.contents.node_id_2 || msg.contents.bitcoin_key_1 == msg.contents.bitcoin_key_2 {
 277                         return Err(HandleError{err: "Channel announcement node had a channel with itself", action: Some(ErrorAction::IgnoreError)});
 278                 }
 279
 280                 let msg_hash = Message::from_slice(&Sha256dHash::from_data(&msg.contents.encode()[..])[..]).unwrap();
 281                 secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_1, &msg.contents.node_id_1);
 282                 secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.node_signature_2, &msg.contents.node_id_2);
 283                 secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_1, &msg.contents.bitcoin_key_1);
 284                 secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.bitcoin_signature_2, &msg.contents.bitcoin_key_2);
 285
 286                 if msg.contents.features.requires_unknown_bits() {
 287                         panic!("Unknown-required-features ChannelAnnouncements should never deserialize!");
 288                 }
 289
 290                 let checked_utxo = match self.chain_monitor.get_chain_utxo(msg.contents.chain_hash, msg.contents.short_channel_id) {
 291                         Ok((script_pubkey, _value)) => {
 292                                 let expected_script = Builder::new().push_opcode(opcodes::All::OP_PUSHNUM_2)
 293                                                                     .push_slice(&msg.contents.bitcoin_key_1.serialize())
 294                                                                     .push_slice(&msg.contents.bitcoin_key_2.serialize())
 295                                                                     .push_opcode(opcodes::All::OP_PUSHNUM_2).push_opcode(opcodes::All::OP_CHECKMULTISIG).into_script().to_v0_p2wsh();
 296                                 if script_pubkey != expected_script {
 297                                         return Err(HandleError{err: "Channel announcement keys didn't match on-chain script", action: Some(ErrorAction::IgnoreError)});
 298                                 }
 299                                 //TODO: Check if value is worth storing, use it to inform routing, and compare it
 300                                 //to the new HTLC max field in channel_update
 301                                 true
 302                         },
 303                         Err(ChainError::NotSupported) => {
 304                                 // Tentatively accept, potentially exposing us to DoS attacks
 305                                 false
 306                         },
 307                         Err(ChainError::NotWatched) => {
 308                                 return Err(HandleError{err: "Channel announced on an unknown chain", action: Some(ErrorAction::IgnoreError)});
 309                         },
 310                         Err(ChainError::UnknownTx) => {
 311                                 return Err(HandleError{err: "Channel announced without corresponding UTXO entry", action: Some(ErrorAction::IgnoreError)});
 312                         },
 313                 };
 314
 315                 let mut network_lock = self.network_map.write().unwrap();
 316                 let network = network_lock.borrow_parts();
 317
 318                 let chan_info = ChannelInfo {
 319                                 features: msg.contents.features.clone(),
 320                                 one_to_two: DirectionalChannelInfo {
 321                                         src_node_id: msg.contents.node_id_1.clone(),
 322                                         last_update: 0,
 323                                         enabled: false,
 324                                         cltv_expiry_delta: u16::max_value(),
 325                                         htlc_minimum_msat: u64::max_value(),
 326                                         fee_base_msat: u32::max_value(),
 327                                         fee_proportional_millionths: u32::max_value(),
 328                                         last_update_message : None,
 329                                 },
 330                                 two_to_one: DirectionalChannelInfo {
 331                                         src_node_id: msg.contents.node_id_2.clone(),
 332                                         last_update: 0,
 333                                         enabled: false,
 334                                         cltv_expiry_delta: u16::max_value(),
 335                                         htlc_minimum_msat: u64::max_value(),
 336                                         fee_base_msat: u32::max_value(),
 337                                         fee_proportional_millionths: u32::max_value(),
 338                                         last_update_message : None,
 339                                 },
 340                                 announcement_message : if msg.contents.excess_data.is_empty(){
 341                                         Some(msg.clone())
 342                                 }
 343                                 else{
 344                                         None
 345                                 },
 346                         };
 347
 348                 match network.channels.entry(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
 349                         BtreeEntry::Occupied(mut entry) => {
 350                                 //TODO: because asking the blockchain if short_channel_id is valid is only optional
 351                                 //in the blockchain API, we need to handle it smartly here, though its unclear
 352                                 //exactly how...
 353                                 if checked_utxo {
 354                                         // Either our UTXO provider is busted, there was a reorg, or the UTXO provider
 355                                         // only sometimes returns results. In any case remove the previous entry. Note
 356                                         // that the spec expects us to "blacklist" the node_ids involved, but we can't
 357                                         // do that because
 358                                         // a) we don't *require* a UTXO provider that always returns results.
 359                                         // b) we don't track UTXOs of channels we know about and remove them if they
 360                                         //    get reorg'd out.
 361                                         // c) it's unclear how to do so without exposing ourselves to massive DoS risk.
 362                                         Self::remove_channel_in_nodes(network.nodes, &entry.get(), msg.contents.short_channel_id);
 363                                         *entry.get_mut() = chan_info;
 364                                 } else {
 365                                         return Err(HandleError{err: "Already have knowledge of channel", action: Some(ErrorAction::IgnoreError)})
 366                                 }
 367                         },
 368                         BtreeEntry::Vacant(entry) => {
 369                                 entry.insert(chan_info);
 370                         }
 371                 };
 372
 373                 macro_rules! add_channel_to_node {
 374                         ( $node_id: expr ) => {
 375                                 match network.nodes.entry($node_id) {
 376                                         BtreeEntry::Occupied(node_entry) => {
 377                                                 node_entry.into_mut().channels.push(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash));
 378                                         },
 379                                         BtreeEntry::Vacant(node_entry) => {
 380                                                 node_entry.insert(NodeInfo {
 381                                                         channels: vec!(NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)),
 382                                                         lowest_inbound_channel_fee_base_msat: u32::max_value(),
 383                                                         lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
 384                                                         features: GlobalFeatures::new(),
 385                                                         last_update: 0,
 386                                                         rgb: [0; 3],
 387                                                         alias: [0; 32],
 388                                                         addresses: Vec::new(),
 389                                                         announcement_message: None,
 390                                                 });
 391                                         }
 392                                 }
 393                         };
 394                 }
 395
 396                 add_channel_to_node!(msg.contents.node_id_1);
 397                 add_channel_to_node!(msg.contents.node_id_2);
 398
 399                 Ok(msg.contents.excess_data.is_empty() && !msg.contents.features.supports_unknown_bits())
 400         }
 401
 402         fn handle_htlc_fail_channel_update(&self, update: &msgs::HTLCFailChannelUpdate) {
 403                 match update {
 404                         &msgs::HTLCFailChannelUpdate::ChannelUpdateMessage { ref msg } => {
 405                                 let _ = self.handle_channel_update(msg);
 406                         },
 407                         &msgs::HTLCFailChannelUpdate::ChannelClosed { ref short_channel_id, ref is_permanent } => {
 408                                 let mut network = self.network_map.write().unwrap();
 409                                 if *is_permanent {
 410                                         if let Some(chan) = network.channels.remove(short_channel_id) {
 411                                                 Self::remove_channel_in_nodes(&mut network.nodes, &chan, *short_channel_id);
 412                                         }
 413                                 } else {
 414                                         if let Some(chan) = network.channels.get_mut(short_channel_id) {
 415                                                 chan.one_to_two.enabled = false;
 416                                                 chan.two_to_one.enabled = false;
 417                                         }
 418                                 }
 419                         },
 420                         &msgs::HTLCFailChannelUpdate::NodeFailure { ref node_id, ref is_permanent } => {
 421                                 if *is_permanent {
 422                                         //TODO: Wholly remove the node
 423                                 } else {
 424                                         self.mark_node_bad(node_id, false);
 425                                 }
 426                         },
 427                 }
 428         }
 429
 430         fn handle_channel_update(&self, msg: &msgs::ChannelUpdate) -> Result<bool, HandleError> {
 431                 let mut network = self.network_map.write().unwrap();
 432                 let dest_node_id;
 433                 let chan_enabled = msg.contents.flags & (1 << 1) != (1 << 1);
 434                 let chan_was_enabled;
 435
 436                 match network.channels.get_mut(&NetworkMap::get_key(msg.contents.short_channel_id, msg.contents.chain_hash)) {
 437                         None => return Err(HandleError{err: "Couldn't find channel for update", action: Some(ErrorAction::IgnoreError)}),
 438                         Some(channel) => {
 439                                 macro_rules! maybe_update_channel_info {
 440                                         ( $target: expr) => {
 441                                                 if $target.last_update >= msg.contents.timestamp {
 442                                                         return Err(HandleError{err: "Update older than last processed update", action: Some(ErrorAction::IgnoreError)});
 443                                                 }
 444                                                 chan_was_enabled = $target.enabled;
 445                                                 $target.last_update = msg.contents.timestamp;
 446                                                 $target.enabled = chan_enabled;
 447                                                 $target.cltv_expiry_delta = msg.contents.cltv_expiry_delta;
 448                                                 $target.htlc_minimum_msat = msg.contents.htlc_minimum_msat;
 449                                                 $target.fee_base_msat = msg.contents.fee_base_msat;
 450                                                 $target.fee_proportional_millionths = msg.contents.fee_proportional_millionths;
 451                                                 $target.last_update_message = if msg.contents.excess_data.is_empty(){
 452                                                         Some(msg.clone())
 453                                                 }
 454                                                 else{
 455                                                 None
 456                                                 };
 457                                         }
 458                                 }
 459                                 let msg_hash = Message::from_slice(&Sha256dHash::from_data(&msg.contents.encode()[..])[..]).unwrap();
 460                                 if msg.contents.flags & 1 == 1 {
 461                                         dest_node_id = channel.one_to_two.src_node_id.clone();
 462                                         secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.two_to_one.src_node_id);
 463                                         maybe_update_channel_info!(channel.two_to_one);
 464                                 } else {
 465                                         dest_node_id = channel.two_to_one.src_node_id.clone();
 466                                         secp_verify_sig!(self.secp_ctx, &msg_hash, &msg.signature, &channel.one_to_two.src_node_id);
 467                                         maybe_update_channel_info!(channel.one_to_two);
 468                                 }
 469                         }
 470                 }
 471
 472                 if chan_enabled {
 473                         let node = network.nodes.get_mut(&dest_node_id).unwrap();
 474                         node.lowest_inbound_channel_fee_base_msat = cmp::min(node.lowest_inbound_channel_fee_base_msat, msg.contents.fee_base_msat);
 475                         node.lowest_inbound_channel_fee_proportional_millionths = cmp::min(node.lowest_inbound_channel_fee_proportional_millionths, msg.contents.fee_proportional_millionths);
 476                 } else if chan_was_enabled {
 477                         let mut lowest_inbound_channel_fee_base_msat = u32::max_value();
 478                         let mut lowest_inbound_channel_fee_proportional_millionths = u32::max_value();
 479
 480                         {
 481                                 let node = network.nodes.get(&dest_node_id).unwrap();
 482
 483                                 for chan_id in node.channels.iter() {
 484                                         let chan = network.channels.get(chan_id).unwrap();
 485                                         if chan.one_to_two.src_node_id == dest_node_id {
 486                                                 lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.two_to_one.fee_base_msat);
 487                                                 lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.two_to_one.fee_proportional_millionths);
 488                                         } else {
 489                                                 lowest_inbound_channel_fee_base_msat = cmp::min(lowest_inbound_channel_fee_base_msat, chan.one_to_two.fee_base_msat);
 490                                                 lowest_inbound_channel_fee_proportional_millionths = cmp::min(lowest_inbound_channel_fee_proportional_millionths, chan.one_to_two.fee_proportional_millionths);
 491                                         }
 492                                 }
 493                         }
 494
 495                         //TODO: satisfy the borrow-checker without a double-map-lookup :(
 496                         let mut_node = network.nodes.get_mut(&dest_node_id).unwrap();
 497                         mut_node.lowest_inbound_channel_fee_base_msat = lowest_inbound_channel_fee_base_msat;
 498                         mut_node.lowest_inbound_channel_fee_proportional_millionths = lowest_inbound_channel_fee_proportional_millionths;
 499                 }
 500
 501                 Ok(msg.contents.excess_data.is_empty())
 502         }
 503
 504
 505         fn get_next_channel_announcements(&self, starting_point: &mut InitSyncTracker, batch_amount: u8)->(Vec<(msgs::ChannelAnnouncement, msgs::ChannelUpdate,msgs::ChannelUpdate)>){
 506                 let mut result = Vec::new();
 507                 let network = self.network_map.read().unwrap();
 508                 let mut starting_for_next = if let InitSyncTracker::ChannelCounter(i) = *starting_point {i} else {0 as u64};
 509                 let mut iter = network.channels.range((starting_for_next)..);
 510                 for _x in 0..batch_amount{
 511                         if let Some(ref value) = iter.next(){
 512                                 if value.1.announcement_message.is_some() && value.1.one_to_two.last_update_message.is_some() && value.1.two_to_one.last_update_message.is_some(){
 513                                         let channel_announcement = value.1.announcement_message.clone().unwrap();
 514                                         let channel_update1 = value.1.one_to_two.last_update_message.clone().unwrap();
 515                                         let channel_update2 = value.1.two_to_one.last_update_message.clone().unwrap();
 516                                         result.push((channel_announcement,channel_update1, channel_update2));
 517                                 }
 518                                 starting_for_next = *(value.0) ;//adjusting start value so we can pass the last used back
 519                         }
 520                 }
 521                 *starting_point = if result.len() == 0{
 522                         InitSyncTracker::Sync(false) //sync done so disable sync required
 523                 } else {
 524                         InitSyncTracker::ChannelCounter(starting_for_next)
 525                 };
 526                 (result)
 527         }
 528
 529         fn get_next_node_announcements(&self, starting_point: &mut InitSyncTracker, batch_amount: u8)->(Vec<msgs::NodeAnnouncement>){
 530                 let mut result = Vec::new();
 531                 let network = self.network_map.read().unwrap();
 532                 let mut iter = if let InitSyncTracker::NodeCounter(i) = *starting_point {network.nodes.range((i)..)} else {
 533                         let first_item = network.nodes.iter().next();
 534                         if let None = first_item  {*starting_point = InitSyncTracker::Sync(false); return result} //for some reason we know of no nodes
 535                         network.nodes.range(*(first_item.unwrap().0)..)};
 536                 for _x in 0..batch_amount{
 537                         if let Some(ref value) = iter.next(){
 538                                 if value.1.announcement_message.is_some(){
 539                                         let node_announcement = value.1.announcement_message.clone().unwrap();
 540                                         result.push(node_announcement);
 541                                 }
 542                                 *starting_point = InitSyncTracker::NodeCounter(*(value.0)) ;//adjusting start value so we can pass the last used back
 543                         }
 544                 }
 545                 if result.len() == 0{
 546                         *starting_point = InitSyncTracker::ChannelCounter(0) //node syncing done, move on towards channels
 547                 };
 548                 result
 549         }
 550 }
 551
 552 #[derive(Eq, PartialEq)]
 553 struct RouteGraphNode {
 554         pubkey: PublicKey,
 555         lowest_fee_to_peer_through_node: u64,
 556         lowest_fee_to_node: u64,
 557 }
 558
 559 impl cmp::Ord for RouteGraphNode {
 560         fn cmp(&self, other: &RouteGraphNode) -> cmp::Ordering {
 561                 other.lowest_fee_to_peer_through_node.cmp(&self.lowest_fee_to_peer_through_node)
 562                         .then_with(|| other.pubkey.serialize().cmp(&self.pubkey.serialize()))
 563         }
 564 }
 565
 566 impl cmp::PartialOrd for RouteGraphNode {
 567         fn partial_cmp(&self, other: &RouteGraphNode) -> Option<cmp::Ordering> {
 568                 Some(self.cmp(other))
 569         }
 570 }
 571
 572 struct DummyDirectionalChannelInfo {
 573         src_node_id: PublicKey,
 574         cltv_expiry_delta: u32,
 575         htlc_minimum_msat: u64,
 576         fee_base_msat: u32,
 577         fee_proportional_millionths: u32,
 578 }
 579
 580 impl Router {
 581         /// Creates a new router with the given node_id to be used as the source for get_route()
 582         pub fn new(our_pubkey: PublicKey, chain_monitor: Arc<ChainWatchInterface>, logger: Arc<Logger>) -> Router {
 583                 let mut nodes = BTreeMap::new();
 584                 nodes.insert(our_pubkey.clone(), NodeInfo {
 585                         channels: Vec::new(),
 586                         lowest_inbound_channel_fee_base_msat: u32::max_value(),
 587                         lowest_inbound_channel_fee_proportional_millionths: u32::max_value(),
 588                         features: GlobalFeatures::new(),
 589                         last_update: 0,
 590                         rgb: [0; 3],
 591                         alias: [0; 32],
 592                         addresses: Vec::new(),
 593                         announcement_message: None,
 594                 });
 595                 Router {
 596                         secp_ctx: Secp256k1::verification_only(),
 597                         network_map: RwLock::new(NetworkMap {
 598                                 channels: BTreeMap::new(),
 599                                 our_node_id: our_pubkey,
 600                                 nodes: nodes,
 601                         }),
 602                         chain_monitor,
 603                         logger,
 604                 }
 605         }
 606
 607         /// Dumps the entire network view of this Router to the logger provided in the constructor at
 608         /// level Trace
 609         pub fn trace_state(&self) {
 610                 log_trace!(self, "{}", self.network_map.read().unwrap());
 611         }
 612
 613         /// Get network addresses by node id
 614         pub fn get_addresses(&self, pubkey: &PublicKey) -> Option<Vec<NetAddress>> {
 615                 let network = self.network_map.read().unwrap();
 616                 network.nodes.get(pubkey).map(|n| n.addresses.clone())
 617         }
 618
 619         /// Marks a node as having failed a route. This will avoid re-using the node in routes for now,
 620         /// with an expotnential decay in node "badness". Note that there is deliberately no
 621         /// mark_channel_bad as a node may simply lie and suggest that an upstream channel from it is
 622         /// what failed the route and not the node itself. Instead, setting the blamed_upstream_node
 623         /// boolean will reduce the penalty, returning the node to usability faster. If the node is
 624         /// behaving correctly, it will disable the failing channel and we will use it again next time.
 625         pub fn mark_node_bad(&self, _node_id: &PublicKey, _blamed_upstream_node: bool) {
 626                 unimplemented!();
 627         }
 628
 629         fn remove_channel_in_nodes(nodes: &mut BTreeMap<PublicKey, NodeInfo>, chan: &ChannelInfo, short_channel_id: u64) {
 630                 macro_rules! remove_from_node {
 631                         ($node_id: expr) => {
 632                                 if let BtreeEntry::Occupied(mut entry) = nodes.entry($node_id) {
 633                                         entry.get_mut().channels.retain(|chan_id| {
 634                                                 short_channel_id != *NetworkMap::get_short_id(chan_id)
 635                                         });
 636                                         if entry.get().channels.is_empty() {
 637                                                 entry.remove_entry();
 638                                         }
 639                                 } else {
 640                                         panic!("Had channel that pointed to unknown node (ie inconsistent network map)!");
 641                                 }
 642                         }
 643                 }
 644                 remove_from_node!(chan.one_to_two.src_node_id);
 645                 remove_from_node!(chan.two_to_one.src_node_id);
 646         }
 647
 648         /// Gets a route from us to the given target node.
 649         ///
 650         /// Extra routing hops between known nodes and the target will be used if they are included in
 651         /// last_hops.
 652         ///
 653         /// If some channels aren't announced, it may be useful to fill in a first_hops with the
 654         /// results from a local ChannelManager::list_usable_channels() call. If it is filled in, our
 655         /// (this Router's) view of our local channels will be ignored, and only those in first_hops
 656         /// will be used.
 657         ///
 658         /// Panics if first_hops contains channels without short_channel_ids
 659         /// (ChannelManager::list_usable_channels will never include such channels).
 660         ///
 661         /// The fees on channels from us to next-hops are ignored (as they are assumed to all be
 662         /// equal), however the enabled/disabled bit on such channels as well as the htlc_minimum_msat
 663         /// *is* checked as they may change based on the receiving node.
 664         pub fn get_route(&self, target: &PublicKey, first_hops: Option<&[channelmanager::ChannelDetails]>, last_hops: &[RouteHint], final_value_msat: u64, final_cltv: u32) -> Result<Route, HandleError> {
 665                 // TODO: Obviously *only* using total fee cost sucks. We should consider weighting by
 666                 // uptime/success in using a node in the past.
 667                 let network = self.network_map.read().unwrap();
 668
 669                 if *target == network.our_node_id {
 670                         return Err(HandleError{err: "Cannot generate a route to ourselves", action: None});
 671                 }
 672
 673                 if final_value_msat > 21_000_000 * 1_0000_0000 * 1000 {
 674                         return Err(HandleError{err: "Cannot generate a route of more value than all existing satoshis", action: None});
 675                 }
 676
 677                 // We do a dest-to-source Dijkstra's sorting by each node's distance from the destination
 678                 // plus the minimum per-HTLC fee to get from it to another node (aka "shitty A*").
 679                 // TODO: There are a few tweaks we could do, including possibly pre-calculating more stuff
 680                 // to use as the A* heuristic beyond just the cost to get one node further than the current
 681                 // one.
 682
 683                 let dummy_directional_info = DummyDirectionalChannelInfo { // used for first_hops routes
 684                         src_node_id: network.our_node_id.clone(),
 685                         cltv_expiry_delta: 0,
 686                         htlc_minimum_msat: 0,
 687                         fee_base_msat: 0,
 688                         fee_proportional_millionths: 0,
 689                 };
 690
 691                 let mut targets = BinaryHeap::new(); //TODO: Do we care about switching to eg Fibbonaci heap?
 692                 let mut dist = HashMap::with_capacity(network.nodes.len());
 693
 694                 let mut first_hop_targets = HashMap::with_capacity(if first_hops.is_some() { first_hops.as_ref().unwrap().len() } else { 0 });
 695                 if let Some(hops) = first_hops {
 696                         for chan in hops {
 697                                 let short_channel_id = chan.short_channel_id.expect("first_hops should be filled in with usable channels, not pending ones");
 698                                 if chan.remote_network_id == *target {
 699                                         return Ok(Route {
 700                                                 hops: vec![RouteHop {
 701                                                         pubkey: chan.remote_network_id,
 702                                                         short_channel_id,
 703                                                         fee_msat: final_value_msat,
 704                                                         cltv_expiry_delta: final_cltv,
 705                                                 }],
 706                                         });
 707                                 }
 708                                 first_hop_targets.insert(chan.remote_network_id, short_channel_id);
 709                         }
 710                         if first_hop_targets.is_empty() {
 711                                 return Err(HandleError{err: "Cannot route when there are no outbound routes away from us", action: None});
 712                         }
 713                 }
 714
 715                 macro_rules! add_entry {
 716                         // Adds entry which goes from the node pointed to by $directional_info to
 717                         // $dest_node_id over the channel with id $chan_id with fees described in
 718                         // $directional_info.
 719                         ( $chan_id: expr, $dest_node_id: expr, $directional_info: expr, $starting_fee_msat: expr ) => {
 720                                 //TODO: Explore simply adding fee to hit htlc_minimum_msat
 721                                 if $starting_fee_msat as u64 + final_value_msat > $directional_info.htlc_minimum_msat {
 722                                         let proportional_fee_millions = ($starting_fee_msat + final_value_msat).checked_mul($directional_info.fee_proportional_millionths as u64);
 723                                         if let Some(new_fee) = proportional_fee_millions.and_then(|part| {
 724                                                         ($directional_info.fee_base_msat as u64).checked_add(part / 1000000) })
 725                                         {
 726                                                 let mut total_fee = $starting_fee_msat as u64;
 727                                                 let hm_entry = dist.entry(&$directional_info.src_node_id);
 728                                                 let old_entry = hm_entry.or_insert_with(|| {
 729                                                         let node = network.nodes.get(&$directional_info.src_node_id).unwrap();
 730                                                         (u64::max_value(),
 731                                                                 node.lowest_inbound_channel_fee_base_msat,
 732                                                                 node.lowest_inbound_channel_fee_proportional_millionths,
 733                                                                 RouteHop {
 734                                                                         pubkey: $dest_node_id.clone(),
 735                                                                         short_channel_id: 0,
 736                                                                         fee_msat: 0,
 737                                                                         cltv_expiry_delta: 0,
 738                                                         })
 739                                                 });
 740                                                 if $directional_info.src_node_id != network.our_node_id {
 741                                                         // Ignore new_fee for channel-from-us as we assume all channels-from-us
 742                                                         // will have the same effective-fee
 743                                                         total_fee += new_fee;
 744                                                         if let Some(fee_inc) = final_value_msat.checked_add(total_fee).and_then(|inc| { (old_entry.2 as u64).checked_mul(inc) }) {
 745                                                                 total_fee += fee_inc / 1000000 + (old_entry.1 as u64);
 746                                                         } else {
 747                                                                 // max_value means we'll always fail the old_entry.0 > total_fee check
 748                                                                 total_fee = u64::max_value();
 749                                                         }
 750                                                 }
 751                                                 let new_graph_node = RouteGraphNode {
 752                                                         pubkey: $directional_info.src_node_id,
 753                                                         lowest_fee_to_peer_through_node: total_fee,
 754                                                         lowest_fee_to_node: $starting_fee_msat as u64 + new_fee,
 755                                                 };
 756                                                 if old_entry.0 > total_fee {
 757                                                         targets.push(new_graph_node);
 758                                                         old_entry.0 = total_fee;
 759                                                         old_entry.3 = RouteHop {
 760                                                                 pubkey: $dest_node_id.clone(),
 761                                                                 short_channel_id: $chan_id.clone(),
 762                                                                 fee_msat: new_fee, // This field is ignored on the last-hop anyway
 763                                                                 cltv_expiry_delta: $directional_info.cltv_expiry_delta as u32,
 764                                                         }
 765                                                 }
 766                                         }
 767                                 }
 768                         };
 769                 }
 770
 771                 macro_rules! add_entries_to_cheapest_to_target_node {
 772                         ( $node: expr, $node_id: expr, $fee_to_target_msat: expr ) => {
 773                                 if first_hops.is_some() {
 774                                         if let Some(first_hop) = first_hop_targets.get(&$node_id) {
 775                                                 add_entry!(first_hop, $node_id, dummy_directional_info, $fee_to_target_msat);
 776                                         }
 777                                 }
 778
 779                                 for chan_id in $node.channels.iter() {
 780                                         let chan = network.channels.get(chan_id).unwrap();
 781                                         if chan.one_to_two.src_node_id == *$node_id {
 782                                                 // ie $node is one, ie next hop in A* is two, via the two_to_one channel
 783                                                 if first_hops.is_none() || chan.two_to_one.src_node_id != network.our_node_id {
 784                                                         if chan.two_to_one.enabled {
 785                                                                 add_entry!(chan_id, chan.one_to_two.src_node_id, chan.two_to_one, $fee_to_target_msat);
 786                                                         }
 787                                                 }
 788                                         } else {
 789                                                 if first_hops.is_none() || chan.one_to_two.src_node_id != network.our_node_id {
 790                                                         if chan.one_to_two.enabled {
 791                                                                 add_entry!(chan_id, chan.two_to_one.src_node_id, chan.one_to_two, $fee_to_target_msat);
 792                                                         }
 793                                                 }
 794                                         }
 795                                 }
 796                         };
 797                 }
 798
 799                 match network.nodes.get(target) {
 800                         None => {},
 801                         Some(node) => {
 802                                 add_entries_to_cheapest_to_target_node!(node, target, 0);
 803                         },
 804                 }
 805
 806                 for hop in last_hops.iter() {
 807                         if first_hops.is_none() || hop.src_node_id != network.our_node_id { // first_hop overrules last_hops
 808                                 if network.nodes.get(&hop.src_node_id).is_some() {
 809                                         if first_hops.is_some() {
 810                                                 if let Some(first_hop) = first_hop_targets.get(&hop.src_node_id) {
 811                                                         add_entry!(first_hop, hop.src_node_id, dummy_directional_info, 0);
 812                                                 }
 813                                         }
 814                                         add_entry!(hop.short_channel_id, target, hop, 0);
 815                                 }
 816                         }
 817                 }
 818
 819                 while let Some(RouteGraphNode { pubkey, lowest_fee_to_node, .. }) = targets.pop() {
 820                         if pubkey == network.our_node_id {
 821                                 let mut res = vec!(dist.remove(&network.our_node_id).unwrap().3);
 822                                 while res.last().unwrap().pubkey != *target {
 823                                         let new_entry = match dist.remove(&res.last().unwrap().pubkey) {
 824                                                 Some(hop) => hop.3,
 825                                                 None => return Err(HandleError{err: "Failed to find a non-fee-overflowing path to the given destination", action: None}),
 826                                         };
 827                                         res.last_mut().unwrap().fee_msat = new_entry.fee_msat;
 828                                         res.last_mut().unwrap().cltv_expiry_delta = new_entry.cltv_expiry_delta;
 829                                         res.push(new_entry);
 830                                 }
 831                                 res.last_mut().unwrap().fee_msat = final_value_msat;
 832                                 res.last_mut().unwrap().cltv_expiry_delta = final_cltv;
 833                                 let route = Route { hops: res };
 834                                 log_trace!(self, "Got route: {}", log_route!(route));
 835                                 return Ok(route);
 836                         }
 837
 838                         match network.nodes.get(&pubkey) {
 839                                 None => {},
 840                                 Some(node) => {
 841                                         add_entries_to_cheapest_to_target_node!(node, &pubkey, lowest_fee_to_node);
 842                                 },
 843                         }
 844                 }
 845
 846                 Err(HandleError{err: "Failed to find a path to the given destination", action: None})
 847         }
 848 }
 849
 850 #[cfg(test)]
 851 mod tests {
 852         use chain::chaininterface;
 853         use ln::channelmanager;
 854         use ln::router::{Router,NodeInfo,NetworkMap,ChannelInfo,DirectionalChannelInfo,RouteHint};
 855         use ln::msgs::GlobalFeatures;
 856         use util::test_utils;
 857         use util::logger::Logger;
 858
 859         use bitcoin::util::hash::Sha256dHash;
 860         use bitcoin::network::constants::Network;
 861
 862         use hex;
 863
 864         use secp256k1::key::{PublicKey,SecretKey};
 865         use secp256k1::Secp256k1;
 866
 867         use std::sync::Arc;
 868
 869         #[test]
 870         fn route_test() {
 871                 let secp_ctx = Secp256k1::new();
 872                 let our_id = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap());
 873                 let logger: Arc<Logger> = Arc::new(test_utils::TestLogger::new());
 874                 let chain_monitor = Arc::new(chaininterface::ChainWatchInterfaceUtil::new(Network::Testnet, Arc::clone(&logger)));
 875                 let router = Router::new(our_id, chain_monitor, Arc::clone(&logger));
 876
 877                 // Build network from our_id to node8:
 878                 //
 879                 //        -1(1)2-  node1  -1(3)2-
 880                 //       /                       \
 881                 // our_id -1(12)2- node8 -1(13)2--- node3
 882                 //       \                       /
 883                 //        -1(2)2-  node2  -1(4)2-
 884                 //
 885                 //
 886                 // chan1  1-to-2: disabled
 887                 // chan1  2-to-1: enabled, 0 fee
 888                 //
 889                 // chan2  1-to-2: enabled, ignored fee
 890                 // chan2  2-to-1: enabled, 0 fee
 891                 //
 892                 // chan3  1-to-2: enabled, 0 fee
 893                 // chan3  2-to-1: enabled, 100 msat fee
 894                 //
 895                 // chan4  1-to-2: enabled, 100% fee
 896                 // chan4  2-to-1: enabled, 0 fee
 897                 //
 898                 // chan12 1-to-2: enabled, ignored fee
 899                 // chan12 2-to-1: enabled, 0 fee
 900                 //
 901                 // chan13 1-to-2: enabled, 200% fee
 902                 // chan13 2-to-1: enabled, 0 fee
 903                 //
 904                 //
 905                 //       -1(5)2- node4 -1(8)2--
 906                 //       |         2          |
 907                 //       |       (11)         |
 908                 //      /          1           \
 909                 // node3--1(6)2- node5 -1(9)2--- node7 (not in global route map)
 910                 //      \                      /
 911                 //       -1(7)2- node6 -1(10)2-
 912                 //
 913                 // chan5  1-to-2: enabled, 100 msat fee
 914                 // chan5  2-to-1: enabled, 0 fee
 915                 //
 916                 // chan6  1-to-2: enabled, 0 fee
 917                 // chan6  2-to-1: enabled, 0 fee
 918                 //
 919                 // chan7  1-to-2: enabled, 100% fee
 920                 // chan7  2-to-1: enabled, 0 fee
 921                 //
 922                 // chan8  1-to-2: enabled, variable fee (0 then 1000 msat)
 923                 // chan8  2-to-1: enabled, 0 fee
 924                 //
 925                 // chan9  1-to-2: enabled, 1001 msat fee
 926                 // chan9  2-to-1: enabled, 0 fee
 927                 //
 928                 // chan10 1-to-2: enabled, 0 fee
 929                 // chan10 2-to-1: enabled, 0 fee
 930                 //
 931                 // chan11 1-to-2: enabled, 0 fee
 932                 // chan11 2-to-1: enabled, 0 fee
 933
 934                 let node1 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap()[..]).unwrap());
 935                 let node2 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0303030303030303030303030303030303030303030303030303030303030303").unwrap()[..]).unwrap());
 936                 let node3 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0404040404040404040404040404040404040404040404040404040404040404").unwrap()[..]).unwrap());
 937                 let node4 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0505050505050505050505050505050505050505050505050505050505050505").unwrap()[..]).unwrap());
 938                 let node5 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0606060606060606060606060606060606060606060606060606060606060606").unwrap()[..]).unwrap());
 939                 let node6 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0707070707070707070707070707070707070707070707070707070707070707").unwrap()[..]).unwrap());
 940                 let node7 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0808080808080808080808080808080808080808080808080808080808080808").unwrap()[..]).unwrap());
 941                 let node8 = PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&secp_ctx, &hex::decode("0909090909090909090909090909090909090909090909090909090909090909").unwrap()[..]).unwrap());
 942
 943                 let zero_hash = Sha256dHash::from_data(&[0; 32]);
 944
 945                 {
 946                         let mut network = router.network_map.write().unwrap();
 947
 948                         network.nodes.insert(node1.clone(), NodeInfo {
 949                                 channels: vec!(NetworkMap::get_key(1, zero_hash.clone()), NetworkMap::get_key(3, zero_hash.clone())),
 950                                 lowest_inbound_channel_fee_base_msat: 100,
 951                                 lowest_inbound_channel_fee_proportional_millionths: 0,
 952                                 features: GlobalFeatures::new(),
 953                                 last_update: 1,
 954                                 rgb: [0; 3],
 955                                 alias: [0; 32],
 956                                 addresses: Vec::new(),
 957                                 announcement_message : None,
 958                         });
 959                         network.channels.insert(NetworkMap::get_key(1, zero_hash.clone()), ChannelInfo {
 960                                 features: GlobalFeatures::new(),
 961                                 one_to_two: DirectionalChannelInfo {
 962                                         src_node_id: our_id.clone(),
 963                                         last_update: 0,
 964                                         enabled: false,
 965                                         cltv_expiry_delta: u16::max_value(), // This value should be ignored
 966                                         htlc_minimum_msat: 0,
 967                                         fee_base_msat: u32::max_value(), // This value should be ignored
 968                                         fee_proportional_millionths: u32::max_value(), // This value should be ignored
 969                                         last_update_message: None,
 970                                 }, two_to_one: DirectionalChannelInfo {
 971                                         src_node_id: node1.clone(),
 972                                         last_update: 0,
 973                                         enabled: true,
 974                                         cltv_expiry_delta: 0,
 975                                         htlc_minimum_msat: 0,
 976                                         fee_base_msat: 0,
 977                                         fee_proportional_millionths: 0,
 978                                         last_update_message: None,
 979                                 },
 980                                 announcement_message : None,
 981                         });
 982                         network.nodes.insert(node2.clone(), NodeInfo {
 983                                 channels: vec!(NetworkMap::get_key(2, zero_hash.clone()), NetworkMap::get_key(4, zero_hash.clone())),
 984                                 lowest_inbound_channel_fee_base_msat: 0,
 985                                 lowest_inbound_channel_fee_proportional_millionths: 0,
 986                                 features: GlobalFeatures::new(),
 987                                 last_update: 1,
 988                                 rgb: [0; 3],
 989                                 alias: [0; 32],
 990                                 addresses: Vec::new(),
 991                                 announcement_message : None,
 992                         });
 993                         network.channels.insert(NetworkMap::get_key(2, zero_hash.clone()), ChannelInfo {
 994                                 features: GlobalFeatures::new(),
 995                                 one_to_two: DirectionalChannelInfo {
 996                                         src_node_id: our_id.clone(),
 997                                         last_update: 0,
 998                                         enabled: true,
 999                                         cltv_expiry_delta: u16::max_value(), // This value should be ignored
1000                                         htlc_minimum_msat: 0,
1001                                         fee_base_msat: u32::max_value(), // This value should be ignored
1002                                         fee_proportional_millionths: u32::max_value(), // This value should be ignored
1003                                         last_update_message: None,
1004                                 }, two_to_one: DirectionalChannelInfo {
1005                                         src_node_id: node2.clone(),
1006                                         last_update: 0,
1007                                         enabled: true,
1008                                         cltv_expiry_delta: 0,
1009                                         htlc_minimum_msat: 0,
1010                                         fee_base_msat: 0,
1011                                         fee_proportional_millionths: 0,
1012                                         last_update_message: None,
1013                                 },
1014                                 announcement_message : None,
1015                         });
1016                         network.nodes.insert(node8.clone(), NodeInfo {
1017                                 channels: vec!(NetworkMap::get_key(12, zero_hash.clone()), NetworkMap::get_key(13, zero_hash.clone())),
1018                                 lowest_inbound_channel_fee_base_msat: 0,
1019                                 lowest_inbound_channel_fee_proportional_millionths: 0,
1020                                 features: GlobalFeatures::new(),
1021                                 last_update: 1,
1022                                 rgb: [0; 3],
1023                                 alias: [0; 32],
1024                                 addresses: Vec::new(),
1025                                 announcement_message : None,
1026                         });
1027                         network.channels.insert(NetworkMap::get_key(12, zero_hash.clone()), ChannelInfo {
1028                                 features: GlobalFeatures::new(),
1029                                 one_to_two: DirectionalChannelInfo {
1030                                         src_node_id: our_id.clone(),
1031                                         last_update: 0,
1032                                         enabled: true,
1033                                         cltv_expiry_delta: u16::max_value(), // This value should be ignored
1034                                         htlc_minimum_msat: 0,
1035                                         fee_base_msat: u32::max_value(), // This value should be ignored
1036                                         fee_proportional_millionths: u32::max_value(), // This value should be ignored
1037                                         last_update_message: None,
1038                                 }, two_to_one: DirectionalChannelInfo {
1039                                         src_node_id: node8.clone(),
1040                                         last_update: 0,
1041                                         enabled: true,
1042                                         cltv_expiry_delta: 0,
1043                                         htlc_minimum_msat: 0,
1044                                         fee_base_msat: 0,
1045                                         fee_proportional_millionths: 0,
1046                                         last_update_message: None,
1047                                 },
1048                                 announcement_message : None,
1049                         });
1050                         network.nodes.insert(node3.clone(), NodeInfo {
1051                                 channels: vec!(
1052                                         NetworkMap::get_key(3, zero_hash.clone()),
1053                                         NetworkMap::get_key(4, zero_hash.clone()),
1054                                         NetworkMap::get_key(13, zero_hash.clone()),
1055                                         NetworkMap::get_key(5, zero_hash.clone()),
1056                                         NetworkMap::get_key(6, zero_hash.clone()),
1057                                         NetworkMap::get_key(7, zero_hash.clone())),
1058                                 lowest_inbound_channel_fee_base_msat: 0,
1059                                 lowest_inbound_channel_fee_proportional_millionths: 0,
1060                                 features: GlobalFeatures::new(),
1061                                 last_update: 1,
1062                                 rgb: [0; 3],
1063                                 alias: [0; 32],
1064                                 addresses: Vec::new(),
1065                                 announcement_message : None,
1066                         });
1067                         network.channels.insert(NetworkMap::get_key(3, zero_hash.clone()), ChannelInfo {
1068                                 features: GlobalFeatures::new(),
1069                                 one_to_two: DirectionalChannelInfo {
1070                                         src_node_id: node1.clone(),
1071                                         last_update: 0,
1072                                         enabled: true,
1073                                         cltv_expiry_delta: (3 << 8) | 1,
1074                                         htlc_minimum_msat: 0,
1075                                         fee_base_msat: 0,
1076                                         fee_proportional_millionths: 0,
1077                                         last_update_message: None,
1078                                 }, two_to_one: DirectionalChannelInfo {
1079                                         src_node_id: node3.clone(),
1080                                         last_update: 0,
1081                                         enabled: true,
1082                                         cltv_expiry_delta: (3 << 8) | 2,
1083                                         htlc_minimum_msat: 0,
1084                                         fee_base_msat: 100,
1085                                         fee_proportional_millionths: 0,
1086                                         last_update_message: None,
1087                                 },
1088                                 announcement_message : None,
1089                         });
1090                         network.channels.insert(NetworkMap::get_key(4, zero_hash.clone()), ChannelInfo {
1091                                 features: GlobalFeatures::new(),
1092                                 one_to_two: DirectionalChannelInfo {
1093                                         src_node_id: node2.clone(),
1094                                         last_update: 0,
1095                                         enabled: true,
1096                                         cltv_expiry_delta: (4 << 8) | 1,
1097                                         htlc_minimum_msat: 0,
1098                                         fee_base_msat: 0,
1099                                         fee_proportional_millionths: 1000000,
1100                                         last_update_message: None,
1101                                 }, two_to_one: DirectionalChannelInfo {
1102                                         src_node_id: node3.clone(),
1103                                         last_update: 0,
1104                                         enabled: true,
1105                                         cltv_expiry_delta: (4 << 8) | 2,
1106                                         htlc_minimum_msat: 0,
1107                                         fee_base_msat: 0,
1108                                         fee_proportional_millionths: 0,
1109                                         last_update_message: None,
1110                                 },
1111                                 announcement_message : None,
1112                         });
1113                         network.channels.insert(NetworkMap::get_key(13, zero_hash.clone()), ChannelInfo {
1114                                 features: GlobalFeatures::new(),
1115                                 one_to_two: DirectionalChannelInfo {
1116                                         src_node_id: node8.clone(),
1117                                         last_update: 0,
1118                                         enabled: true,
1119                                         cltv_expiry_delta: (13 << 8) | 1,
1120                                         htlc_minimum_msat: 0,
1121                                         fee_base_msat: 0,
1122                                         fee_proportional_millionths: 2000000,
1123                                         last_update_message: None,
1124                                 }, two_to_one: DirectionalChannelInfo {
1125                                         src_node_id: node3.clone(),
1126                                         last_update: 0,
1127                                         enabled: true,
1128                                         cltv_expiry_delta: (13 << 8) | 2,
1129                                         htlc_minimum_msat: 0,
1130                                         fee_base_msat: 0,
1131                                         fee_proportional_millionths: 0,
1132                                         last_update_message: None,
1133                                 },
1134                                 announcement_message : None,
1135                         });
1136                         network.nodes.insert(node4.clone(), NodeInfo {
1137                                 channels: vec!(NetworkMap::get_key(5, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
1138                                 lowest_inbound_channel_fee_base_msat: 0,
1139                                 lowest_inbound_channel_fee_proportional_millionths: 0,
1140                                 features: GlobalFeatures::new(),
1141                                 last_update: 1,
1142                                 rgb: [0; 3],
1143                                 alias: [0; 32],
1144                                 addresses: Vec::new(),
1145                                 announcement_message : None,
1146                         });
1147                         network.channels.insert(NetworkMap::get_key(5, zero_hash.clone()), ChannelInfo {
1148                                 features: GlobalFeatures::new(),
1149                                 one_to_two: DirectionalChannelInfo {
1150                                         src_node_id: node3.clone(),
1151                                         last_update: 0,
1152                                         enabled: true,
1153                                         cltv_expiry_delta: (5 << 8) | 1,
1154                                         htlc_minimum_msat: 0,
1155                                         fee_base_msat: 100,
1156                                         fee_proportional_millionths: 0,
1157                                         last_update_message: None,
1158                                 }, two_to_one: DirectionalChannelInfo {
1159                                         src_node_id: node4.clone(),
1160                                         last_update: 0,
1161                                         enabled: true,
1162                                         cltv_expiry_delta: (5 << 8) | 2,
1163                                         htlc_minimum_msat: 0,
1164                                         fee_base_msat: 0,
1165                                         fee_proportional_millionths: 0,
1166                                         last_update_message: None,
1167                                 },
1168                                 announcement_message : None,
1169                         });
1170                         network.nodes.insert(node5.clone(), NodeInfo {
1171                                 channels: vec!(NetworkMap::get_key(6, zero_hash.clone()), NetworkMap::get_key(11, zero_hash.clone())),
1172                                 lowest_inbound_channel_fee_base_msat: 0,
1173                                 lowest_inbound_channel_fee_proportional_millionths: 0,
1174                                 features: GlobalFeatures::new(),
1175                                 last_update: 1,
1176                                 rgb: [0; 3],
1177                                 alias: [0; 32],
1178                                 addresses: Vec::new(),
1179                                 announcement_message : None,
1180                         });
1181                         network.channels.insert(NetworkMap::get_key(6, zero_hash.clone()), ChannelInfo {
1182                                 features: GlobalFeatures::new(),
1183                                 one_to_two: DirectionalChannelInfo {
1184                                         src_node_id: node3.clone(),
1185                                         last_update: 0,
1186                                         enabled: true,
1187                                         cltv_expiry_delta: (6 << 8) | 1,
1188                                         htlc_minimum_msat: 0,
1189                                         fee_base_msat: 0,
1190                                         fee_proportional_millionths: 0,
1191                                         last_update_message: None,
1192                                 }, two_to_one: DirectionalChannelInfo {
1193                                         src_node_id: node5.clone(),
1194                                         last_update: 0,
1195                                         enabled: true,
1196                                         cltv_expiry_delta: (6 << 8) | 2,
1197                                         htlc_minimum_msat: 0,
1198                                         fee_base_msat: 0,
1199                                         fee_proportional_millionths: 0,
1200                                         last_update_message: None,
1201                                 },
1202                                 announcement_message : None,
1203                         });
1204                         network.channels.insert(NetworkMap::get_key(11, zero_hash.clone()), ChannelInfo {
1205                                 features: GlobalFeatures::new(),
1206                                 one_to_two: DirectionalChannelInfo {
1207                                         src_node_id: node5.clone(),
1208                                         last_update: 0,
1209                                         enabled: true,
1210                                         cltv_expiry_delta: (11 << 8) | 1,
1211                                         htlc_minimum_msat: 0,
1212                                         fee_base_msat: 0,
1213                                         fee_proportional_millionths: 0,
1214                                         last_update_message: None,
1215                                 }, two_to_one: DirectionalChannelInfo {
1216                                         src_node_id: node4.clone(),
1217                                         last_update: 0,
1218                                         enabled: true,
1219                                         cltv_expiry_delta: (11 << 8) | 2,
1220                                         htlc_minimum_msat: 0,
1221                                         fee_base_msat: 0,
1222                                         fee_proportional_millionths: 0,
1223                                         last_update_message: None,
1224                                 },
1225                                 announcement_message : None,
1226                         });
1227                         network.nodes.insert(node6.clone(), NodeInfo {
1228                                 channels: vec!(NetworkMap::get_key(7, zero_hash.clone())),
1229                                 lowest_inbound_channel_fee_base_msat: 0,
1230                                 lowest_inbound_channel_fee_proportional_millionths: 0,
1231                                 features: GlobalFeatures::new(),
1232                                 last_update: 1,
1233                                 rgb: [0; 3],
1234                                 alias: [0; 32],
1235                                 addresses: Vec::new(),
1236                                 announcement_message : None,
1237                         });
1238                         network.channels.insert(NetworkMap::get_key(7, zero_hash.clone()), ChannelInfo {
1239                                 features: GlobalFeatures::new(),
1240                                 one_to_two: DirectionalChannelInfo {
1241                                         src_node_id: node3.clone(),
1242                                         last_update: 0,
1243                                         enabled: true,
1244                                         cltv_expiry_delta: (7 << 8) | 1,
1245                                         htlc_minimum_msat: 0,
1246                                         fee_base_msat: 0,
1247                                         fee_proportional_millionths: 1000000,
1248                                         last_update_message: None,
1249                                 }, two_to_one: DirectionalChannelInfo {
1250                                         src_node_id: node6.clone(),
1251                                         last_update: 0,
1252                                         enabled: true,
1253                                         cltv_expiry_delta: (7 << 8) | 2,
1254                                         htlc_minimum_msat: 0,
1255                                         fee_base_msat: 0,
1256                                         fee_proportional_millionths: 0,
1257                                         last_update_message: None,
1258                                 },
1259                                 announcement_message : None,
1260                         });
1261                 }
1262
1263                 { // Simple route to 3 via 2
1264                         let route = router.get_route(&node3, None, &Vec::new(), 100, 42).unwrap();
1265                         assert_eq!(route.hops.len(), 2);
1266
1267                         assert_eq!(route.hops[0].pubkey, node2);
1268                         assert_eq!(route.hops[0].short_channel_id, 2);
1269                         assert_eq!(route.hops[0].fee_msat, 100);
1270                         assert_eq!(route.hops[0].cltv_expiry_delta, (4 << 8) | 1);
1271
1272                         assert_eq!(route.hops[1].pubkey, node3);
1273                         assert_eq!(route.hops[1].short_channel_id, 4);
1274                         assert_eq!(route.hops[1].fee_msat, 100);
1275                         assert_eq!(route.hops[1].cltv_expiry_delta, 42);
1276                 }
1277
1278                 { // Route to 1 via 2 and 3 because our channel to 1 is disabled
1279                         let route = router.get_route(&node1, None, &Vec::new(), 100, 42).unwrap();
1280                         assert_eq!(route.hops.len(), 3);
1281
1282                         assert_eq!(route.hops[0].pubkey, node2);
1283                         assert_eq!(route.hops[0].short_channel_id, 2);
1284                         assert_eq!(route.hops[0].fee_msat, 200);
1285                         assert_eq!(route.hops[0].cltv_expiry_delta, (4 << 8) | 1);
1286
1287                         assert_eq!(route.hops[1].pubkey, node3);
1288                         assert_eq!(route.hops[1].short_channel_id, 4);
1289                         assert_eq!(route.hops[1].fee_msat, 100);
1290                         assert_eq!(route.hops[1].cltv_expiry_delta, (3 << 8) | 2);
1291
1292                         assert_eq!(route.hops[2].pubkey, node1);
1293                         assert_eq!(route.hops[2].short_channel_id, 3);
1294                         assert_eq!(route.hops[2].fee_msat, 100);
1295                         assert_eq!(route.hops[2].cltv_expiry_delta, 42);
1296                 }
1297
1298                 { // If we specify a channel to node8, that overrides our local channel view and that gets used
1299                         let our_chans = vec![channelmanager::ChannelDetails {
1300                                 channel_id: [0; 32],
1301                                 short_channel_id: Some(42),
1302                                 remote_network_id: node8.clone(),
1303                                 channel_value_satoshis: 0,
1304                                 user_id: 0,
1305                         }];
1306                         let route = router.get_route(&node3, Some(&our_chans), &Vec::new(), 100, 42).unwrap();
1307                         assert_eq!(route.hops.len(), 2);
1308
1309                         assert_eq!(route.hops[0].pubkey, node8);
1310                         assert_eq!(route.hops[0].short_channel_id, 42);
1311                         assert_eq!(route.hops[0].fee_msat, 200);
1312                         assert_eq!(route.hops[0].cltv_expiry_delta, (13 << 8) | 1);
1313
1314                         assert_eq!(route.hops[1].pubkey, node3);
1315                         assert_eq!(route.hops[1].short_channel_id, 13);
1316                         assert_eq!(route.hops[1].fee_msat, 100);
1317                         assert_eq!(route.hops[1].cltv_expiry_delta, 42);
1318                 }
1319
1320                 let mut last_hops = vec!(RouteHint {
1321                                 src_node_id: node4.clone(),
1322                                 short_channel_id: 8,
1323                                 fee_base_msat: 0,
1324                                 fee_proportional_millionths: 0,
1325                                 cltv_expiry_delta: (8 << 8) | 1,
1326                                 htlc_minimum_msat: 0,
1327                         }, RouteHint {
1328                                 src_node_id: node5.clone(),
1329                                 short_channel_id: 9,
1330                                 fee_base_msat: 1001,
1331                                 fee_proportional_millionths: 0,
1332                                 cltv_expiry_delta: (9 << 8) | 1,
1333                                 htlc_minimum_msat: 0,
1334                         }, RouteHint {
1335                                 src_node_id: node6.clone(),
1336                                 short_channel_id: 10,
1337                                 fee_base_msat: 0,
1338                                 fee_proportional_millionths: 0,
1339                                 cltv_expiry_delta: (10 << 8) | 1,
1340                                 htlc_minimum_msat: 0,
1341                         });
1342
1343                 { // Simple test across 2, 3, 5, and 4 via a last_hop channel
1344                         let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
1345                         assert_eq!(route.hops.len(), 5);
1346
1347                         assert_eq!(route.hops[0].pubkey, node2);
1348                         assert_eq!(route.hops[0].short_channel_id, 2);
1349                         assert_eq!(route.hops[0].fee_msat, 100);
1350                         assert_eq!(route.hops[0].cltv_expiry_delta, (4 << 8) | 1);
1351
1352                         assert_eq!(route.hops[1].pubkey, node3);
1353                         assert_eq!(route.hops[1].short_channel_id, 4);
1354                         assert_eq!(route.hops[1].fee_msat, 0);
1355                         assert_eq!(route.hops[1].cltv_expiry_delta, (6 << 8) | 1);
1356
1357                         assert_eq!(route.hops[2].pubkey, node5);
1358                         assert_eq!(route.hops[2].short_channel_id, 6);
1359                         assert_eq!(route.hops[2].fee_msat, 0);
1360                         assert_eq!(route.hops[2].cltv_expiry_delta, (11 << 8) | 1);
1361
1362                         assert_eq!(route.hops[3].pubkey, node4);
1363                         assert_eq!(route.hops[3].short_channel_id, 11);
1364                         assert_eq!(route.hops[3].fee_msat, 0);
1365                         assert_eq!(route.hops[3].cltv_expiry_delta, (8 << 8) | 1);
1366
1367                         assert_eq!(route.hops[4].pubkey, node7);
1368                         assert_eq!(route.hops[4].short_channel_id, 8);
1369                         assert_eq!(route.hops[4].fee_msat, 100);
1370                         assert_eq!(route.hops[4].cltv_expiry_delta, 42);
1371                 }
1372
1373                 { // Simple test with outbound channel to 4 to test that last_hops and first_hops connect
1374                         let our_chans = vec![channelmanager::ChannelDetails {
1375                                 channel_id: [0; 32],
1376                                 short_channel_id: Some(42),
1377                                 remote_network_id: node4.clone(),
1378                                 channel_value_satoshis: 0,
1379                                 user_id: 0,
1380                         }];
1381                         let route = router.get_route(&node7, Some(&our_chans), &last_hops, 100, 42).unwrap();
1382                         assert_eq!(route.hops.len(), 2);
1383
1384                         assert_eq!(route.hops[0].pubkey, node4);
1385                         assert_eq!(route.hops[0].short_channel_id, 42);
1386                         assert_eq!(route.hops[0].fee_msat, 0);
1387                         assert_eq!(route.hops[0].cltv_expiry_delta, (8 << 8) | 1);
1388
1389                         assert_eq!(route.hops[1].pubkey, node7);
1390                         assert_eq!(route.hops[1].short_channel_id, 8);
1391                         assert_eq!(route.hops[1].fee_msat, 100);
1392                         assert_eq!(route.hops[1].cltv_expiry_delta, 42);
1393                 }
1394
1395                 last_hops[0].fee_base_msat = 1000;
1396
1397                 { // Revert to via 6 as the fee on 8 goes up
1398                         let route = router.get_route(&node7, None, &last_hops, 100, 42).unwrap();
1399                         assert_eq!(route.hops.len(), 4);
1400
1401                         assert_eq!(route.hops[0].pubkey, node2);
1402                         assert_eq!(route.hops[0].short_channel_id, 2);
1403                         assert_eq!(route.hops[0].fee_msat, 200); // fee increased as its % of value transferred across node
1404                         assert_eq!(route.hops[0].cltv_expiry_delta, (4 << 8) | 1);
1405
1406                         assert_eq!(route.hops[1].pubkey, node3);
1407                         assert_eq!(route.hops[1].short_channel_id, 4);
1408                         assert_eq!(route.hops[1].fee_msat, 100);
1409                         assert_eq!(route.hops[1].cltv_expiry_delta, (7 << 8) | 1);
1410
1411                         assert_eq!(route.hops[2].pubkey, node6);
1412                         assert_eq!(route.hops[2].short_channel_id, 7);
1413                         assert_eq!(route.hops[2].fee_msat, 0);
1414                         assert_eq!(route.hops[2].cltv_expiry_delta, (10 << 8) | 1);
1415
1416                         assert_eq!(route.hops[3].pubkey, node7);
1417                         assert_eq!(route.hops[3].short_channel_id, 10);
1418                         assert_eq!(route.hops[3].fee_msat, 100);
1419                         assert_eq!(route.hops[3].cltv_expiry_delta, 42);
1420                 }
1421
1422                 { // ...but still use 8 for larger payments as 6 has a variable feerate
1423                         let route = router.get_route(&node7, None, &last_hops, 2000, 42).unwrap();
1424                         assert_eq!(route.hops.len(), 5);
1425
1426                         assert_eq!(route.hops[0].pubkey, node2);
1427                         assert_eq!(route.hops[0].short_channel_id, 2);
1428                         assert_eq!(route.hops[0].fee_msat, 3000);
1429                         assert_eq!(route.hops[0].cltv_expiry_delta, (4 << 8) | 1);
1430
1431                         assert_eq!(route.hops[1].pubkey, node3);
1432                         assert_eq!(route.hops[1].short_channel_id, 4);
1433                         assert_eq!(route.hops[1].fee_msat, 0);
1434                         assert_eq!(route.hops[1].cltv_expiry_delta, (6 << 8) | 1);
1435
1436                         assert_eq!(route.hops[2].pubkey, node5);
1437                         assert_eq!(route.hops[2].short_channel_id, 6);
1438                         assert_eq!(route.hops[2].fee_msat, 0);
1439                         assert_eq!(route.hops[2].cltv_expiry_delta, (11 << 8) | 1);
1440
1441                         assert_eq!(route.hops[3].pubkey, node4);
1442                         assert_eq!(route.hops[3].short_channel_id, 11);
1443                         assert_eq!(route.hops[3].fee_msat, 1000);
1444                         assert_eq!(route.hops[3].cltv_expiry_delta, (8 << 8) | 1);
1445
1446                         assert_eq!(route.hops[4].pubkey, node7);
1447                         assert_eq!(route.hops[4].short_channel_id, 8);
1448                         assert_eq!(route.hops[4].fee_msat, 2000);
1449                         assert_eq!(route.hops[4].cltv_expiry_delta, 42);
1450                 }
1451         }
1452 }