[rust-lightning] / lightning / src / ln / msgs.rs

//! Wire messages, traits representing wire message handlers, and a few error types live here.
//!
//! For a normal node you probably don't need to use anything here, however, if you wish to split a
//! node into an internet-facing route/message socket handling daemon and a separate daemon (or
//! server entirely) which handles only channel-related messages you may wish to implement
//! ChannelMessageHandler yourself and use it to re-serialize messages and pass them across
//! daemons/servers.
//!
//! Note that if you go with such an architecture (instead of passing raw socket events to a
//! non-internet-facing system) you trust the frontend internet-facing system to not lie about the
//! source node_id of the message, however this does allow you to significantly reduce bandwidth
//! between the systems as routing messages can represent a significant chunk of bandwidth usage
//! (especially for non-channel-publicly-announcing nodes). As an alternate design which avoids
//! this issue, if you have sufficient bidirectional bandwidth between your systems, you may send
//! raw socket events into your non-internet-facing system and then send routing events back to
//! track the network on the less-secure system.

use secp256k1::key::PublicKey;
use secp256k1::Signature;
use secp256k1;
use bitcoin_hashes::sha256d::Hash as Sha256dHash;
use bitcoin::blockdata::script::Script;

use ln::features::{ChannelFeatures, InitFeatures, NodeFeatures};

use std::error::Error;
use std::{cmp, fmt};
use std::io::Read;
use std::result::Result;

use util::events;
use util::ser::{Readable, Writeable, Writer, FixedLengthReader, HighZeroBytesDroppedVarInt};

use ln::channelmanager::{PaymentPreimage, PaymentHash, PaymentSecret};

/// 21 million * 10^8 * 1000
pub(crate) const MAX_VALUE_MSAT: u64 = 21_000_000_0000_0000_000;

/// An error in decoding a message or struct.
#[derive(Debug)]
pub enum DecodeError {
        /// A version byte specified something we don't know how to handle.
        /// Includes unknown realm byte in an OnionHopData packet
        UnknownVersion,
        /// Unknown feature mandating we fail to parse message (eg TLV with an even, unknown type)
        UnknownRequiredFeature,
        /// Value was invalid, eg a byte which was supposed to be a bool was something other than a 0
        /// or 1, a public key/private key/signature was invalid, text wasn't UTF-8, TLV was
        /// syntactically incorrect, etc
        InvalidValue,
        /// Buffer too short
        ShortRead,
        /// A length descriptor in the packet didn't describe the later data correctly
        BadLengthDescriptor,
        /// Error from std::io
        Io(::std::io::Error),
}

/// An init message to be sent or received from a peer
pub struct Init {
        #[cfg(not(feature = "fuzztarget"))]
        pub(crate) features: InitFeatures,
        #[cfg(feature = "fuzztarget")]
        pub features: InitFeatures,
}

/// An error message to be sent or received from a peer
#[derive(Clone)]
pub struct ErrorMessage {
        pub(crate) channel_id: [u8; 32],
        pub(crate) data: String,
}

/// A ping message to be sent or received from a peer
pub struct Ping {
        pub(crate) ponglen: u16,
        pub(crate) byteslen: u16,
}

/// A pong message to be sent or received from a peer
pub struct Pong {
        pub(crate) byteslen: u16,
}

/// An open_channel message to be sent or received from a peer
#[derive(Clone)]
pub struct OpenChannel {
        pub(crate) chain_hash: Sha256dHash,
        pub(crate) temporary_channel_id: [u8; 32],
        pub(crate) funding_satoshis: u64,
        pub(crate) push_msat: u64,
        pub(crate) dust_limit_satoshis: u64,
        pub(crate) max_htlc_value_in_flight_msat: u64,
        pub(crate) channel_reserve_satoshis: u64,
        pub(crate) htlc_minimum_msat: u64,
        pub(crate) feerate_per_kw: u32,
        pub(crate) to_self_delay: u16,
        pub(crate) max_accepted_htlcs: u16,
        pub(crate) funding_pubkey: PublicKey,
        pub(crate) revocation_basepoint: PublicKey,
        pub(crate) payment_basepoint: PublicKey,
        pub(crate) delayed_payment_basepoint: PublicKey,
        pub(crate) htlc_basepoint: PublicKey,
        pub(crate) first_per_commitment_point: PublicKey,
        pub(crate) channel_flags: u8,
        pub(crate) shutdown_scriptpubkey: OptionalField<Script>,
}

/// An accept_channel message to be sent or received from a peer
#[derive(Clone)]
pub struct AcceptChannel {
        pub(crate) temporary_channel_id: [u8; 32],
        pub(crate) dust_limit_satoshis: u64,
        pub(crate) max_htlc_value_in_flight_msat: u64,
        pub(crate) channel_reserve_satoshis: u64,
        pub(crate) htlc_minimum_msat: u64,
        pub(crate) minimum_depth: u32,
        pub(crate) to_self_delay: u16,
        pub(crate) max_accepted_htlcs: u16,
        pub(crate) funding_pubkey: PublicKey,
        pub(crate) revocation_basepoint: PublicKey,
        pub(crate) payment_basepoint: PublicKey,
        pub(crate) delayed_payment_basepoint: PublicKey,
        pub(crate) htlc_basepoint: PublicKey,
        pub(crate) first_per_commitment_point: PublicKey,
        pub(crate) shutdown_scriptpubkey: OptionalField<Script>
}

/// A funding_created message to be sent or received from a peer
#[derive(Clone)]
pub struct FundingCreated {
        pub(crate) temporary_channel_id: [u8; 32],
        pub(crate) funding_txid: Sha256dHash,
        pub(crate) funding_output_index: u16,
        pub(crate) signature: Signature,
}

/// A funding_signed message to be sent or received from a peer
#[derive(Clone)]
pub struct FundingSigned {
        pub(crate) channel_id: [u8; 32],
        pub(crate) signature: Signature,
}

/// A funding_locked message to be sent or received from a peer
#[derive(Clone, PartialEq)]
#[allow(missing_docs)]
pub struct FundingLocked {
        pub channel_id: [u8; 32],
        pub next_per_commitment_point: PublicKey,
}

/// A shutdown message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct Shutdown {
        pub(crate) channel_id: [u8; 32],
        pub(crate) scriptpubkey: Script,
}

/// A closing_signed message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct ClosingSigned {
        pub(crate) channel_id: [u8; 32],
        pub(crate) fee_satoshis: u64,
        pub(crate) signature: Signature,
}

/// An update_add_htlc message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct UpdateAddHTLC {
        pub(crate) channel_id: [u8; 32],
        pub(crate) htlc_id: u64,
        pub(crate) amount_msat: u64,
        pub(crate) payment_hash: PaymentHash,
        pub(crate) cltv_expiry: u32,
        pub(crate) onion_routing_packet: OnionPacket,
}

/// An update_fulfill_htlc message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct UpdateFulfillHTLC {
        pub(crate) channel_id: [u8; 32],
        pub(crate) htlc_id: u64,
        pub(crate) payment_preimage: PaymentPreimage,
}

/// An update_fail_htlc message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct UpdateFailHTLC {
        pub(crate) channel_id: [u8; 32],
        pub(crate) htlc_id: u64,
        pub(crate) reason: OnionErrorPacket,
}

/// An update_fail_malformed_htlc message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct UpdateFailMalformedHTLC {
        pub(crate) channel_id: [u8; 32],
        pub(crate) htlc_id: u64,
        pub(crate) sha256_of_onion: [u8; 32],
        pub(crate) failure_code: u16,
}

/// A commitment_signed message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct CommitmentSigned {
        pub(crate) channel_id: [u8; 32],
        pub(crate) signature: Signature,
        pub(crate) htlc_signatures: Vec<Signature>,
}

/// A revoke_and_ack message to be sent or received from a peer
#[derive(Clone, PartialEq)]
pub struct RevokeAndACK {
        pub(crate) channel_id: [u8; 32],
        pub(crate) per_commitment_secret: [u8; 32],
        pub(crate) next_per_commitment_point: PublicKey,
}

/// An update_fee message to be sent or received from a peer
#[derive(PartialEq, Clone)]
pub struct UpdateFee {
        pub(crate) channel_id: [u8; 32],
        pub(crate) feerate_per_kw: u32,
}

#[derive(PartialEq, Clone)]
pub(crate) struct DataLossProtect {
        pub(crate) your_last_per_commitment_secret: [u8; 32],
        pub(crate) my_current_per_commitment_point: PublicKey,
}

/// A channel_reestablish message to be sent or received from a peer
#[derive(PartialEq, Clone)]
pub struct ChannelReestablish {
        pub(crate) channel_id: [u8; 32],
        pub(crate) next_local_commitment_number: u64,
        pub(crate) next_remote_commitment_number: u64,
        pub(crate) data_loss_protect: OptionalField<DataLossProtect>,
}

/// An announcement_signatures message to be sent or received from a peer
#[derive(PartialEq, Clone, Debug)]
pub struct AnnouncementSignatures {
        pub(crate) channel_id: [u8; 32],
        pub(crate) short_channel_id: u64,
        pub(crate) node_signature: Signature,
        pub(crate) bitcoin_signature: Signature,
}

/// An address which can be used to connect to a remote peer
#[derive(Clone, PartialEq, Debug)]
pub enum NetAddress {
        /// An IPv4 address/port on which the peer is listening.
        IPv4 {
                /// The 4-byte IPv4 address
                addr: [u8; 4],
                /// The port on which the node is listening
                port: u16,
        },
        /// An IPv6 address/port on which the peer is listening.
        IPv6 {
                /// The 16-byte IPv6 address
                addr: [u8; 16],
                /// The port on which the node is listening
                port: u16,
        },
        /// An old-style Tor onion address/port on which the peer is listening.
        OnionV2 {
                /// The bytes (usually encoded in base32 with ".onion" appended)
                addr: [u8; 10],
                /// The port on which the node is listening
                port: u16,
        },
        /// A new-style Tor onion address/port on which the peer is listening.
        /// To create the human-readable "hostname", concatenate ed25519_pubkey, checksum, and version,
        /// wrap as base32 and append ".onion".
        OnionV3 {
                /// The ed25519 long-term public key of the peer
                ed25519_pubkey: [u8; 32],
                /// The checksum of the pubkey and version, as included in the onion address
                checksum: u16,
                /// The version byte, as defined by the Tor Onion v3 spec.
                version: u8,
                /// The port on which the node is listening
                port: u16,
        },
}
impl NetAddress {
        fn get_id(&self) -> u8 {
                match self {
                        &NetAddress::IPv4 {..} => { 1 },
                        &NetAddress::IPv6 {..} => { 2 },
                        &NetAddress::OnionV2 {..} => { 3 },
                        &NetAddress::OnionV3 {..} => { 4 },
                }
        }

        /// Strict byte-length of address descriptor, 1-byte type not recorded
        fn len(&self) -> u16 {
                match self {
                        &NetAddress::IPv4 { .. } => { 6 },
                        &NetAddress::IPv6 { .. } => { 18 },
                        &NetAddress::OnionV2 { .. } => { 12 },
                        &NetAddress::OnionV3 { .. } => { 37 },
                }
        }

        /// The maximum length of any address descriptor, not including the 1-byte type
        pub(crate) const MAX_LEN: u16 = 37;
}

impl Writeable for NetAddress {
        fn write<W: Writer>(&self, writer: &mut W) -> Result<(), ::std::io::Error> {
                match self {
                        &NetAddress::IPv4 { ref addr, ref port } => {
                                1u8.write(writer)?;
                                addr.write(writer)?;
                                port.write(writer)?;
                        },
                        &NetAddress::IPv6 { ref addr, ref port } => {
                                2u8.write(writer)?;
                                addr.write(writer)?;
                                port.write(writer)?;
                        },
                        &NetAddress::OnionV2 { ref addr, ref port } => {
                                3u8.write(writer)?;
                                addr.write(writer)?;
                                port.write(writer)?;
                        },
                        &NetAddress::OnionV3 { ref ed25519_pubkey, ref checksum, ref version, ref port } => {
                                4u8.write(writer)?;
                                ed25519_pubkey.write(writer)?;
                                checksum.write(writer)?;
                                version.write(writer)?;
                                port.write(writer)?;
                        }
                }
                Ok(())
        }
}

impl Readable for Result<NetAddress, u8> {
        fn read<R: Read>(reader: &mut R) -> Result<Result<NetAddress, u8>, DecodeError> {
                let byte = <u8 as Readable>::read(reader)?;
                match byte {
                        1 => {
                                Ok(Ok(NetAddress::IPv4 {
                                        addr: Readable::read(reader)?,
                                        port: Readable::read(reader)?,
                                }))
                        },
                        2 => {
                                Ok(Ok(NetAddress::IPv6 {
                                        addr: Readable::read(reader)?,
                                        port: Readable::read(reader)?,
                                }))
                        },
                        3 => {
                                Ok(Ok(NetAddress::OnionV2 {
                                        addr: Readable::read(reader)?,
                                        port: Readable::read(reader)?,
                                }))
                        },
                        4 => {
                                Ok(Ok(NetAddress::OnionV3 {
                                        ed25519_pubkey: Readable::read(reader)?,
                                        checksum: Readable::read(reader)?,
                                        version: Readable::read(reader)?,
                                        port: Readable::read(reader)?,
                                }))
                        },
                        _ => return Ok(Err(byte)),
                }
        }
}

// Only exposed as broadcast of node_announcement should be filtered by node_id
/// The unsigned part of a node_announcement
#[derive(PartialEq, Clone, Debug)]
pub struct UnsignedNodeAnnouncement {
        pub(crate) features: NodeFeatures,
        pub(crate) timestamp: u32,
        /// The node_id this announcement originated from (don't rebroadcast the node_announcement back
        /// to this node).
        pub        node_id: PublicKey,
        pub(crate) rgb: [u8; 3],
        pub(crate) alias: [u8; 32],
        /// List of addresses on which this node is reachable. Note that you may only have up to one
        /// address of each type, if you have more, they may be silently discarded or we may panic!
        pub(crate) addresses: Vec<NetAddress>,
        pub(crate) excess_address_data: Vec<u8>,
        pub(crate) excess_data: Vec<u8>,
}
#[derive(PartialEq, Clone)]
/// A node_announcement message to be sent or received from a peer
pub struct NodeAnnouncement {
        pub(crate) signature: Signature,
        pub(crate) contents: UnsignedNodeAnnouncement,
}

// Only exposed as broadcast of channel_announcement should be filtered by node_id
/// The unsigned part of a channel_announcement
#[derive(PartialEq, Clone, Debug)]
pub struct UnsignedChannelAnnouncement {
        pub(crate) features: ChannelFeatures,
        pub(crate) chain_hash: Sha256dHash,
        pub(crate) short_channel_id: u64,
        /// One of the two node_ids which are endpoints of this channel
        pub        node_id_1: PublicKey,
        /// The other of the two node_ids which are endpoints of this channel
        pub        node_id_2: PublicKey,
        pub(crate) bitcoin_key_1: PublicKey,
        pub(crate) bitcoin_key_2: PublicKey,
        pub(crate) excess_data: Vec<u8>,
}
/// A channel_announcement message to be sent or received from a peer
#[derive(PartialEq, Clone, Debug)]
pub struct ChannelAnnouncement {
        pub(crate) node_signature_1: Signature,
        pub(crate) node_signature_2: Signature,
        pub(crate) bitcoin_signature_1: Signature,
        pub(crate) bitcoin_signature_2: Signature,
        pub(crate) contents: UnsignedChannelAnnouncement,
}

#[derive(PartialEq, Clone, Debug)]
pub(crate) struct UnsignedChannelUpdate {
        pub(crate) chain_hash: Sha256dHash,
        pub(crate) short_channel_id: u64,
        pub(crate) timestamp: u32,
        pub(crate) flags: u16,
        pub(crate) cltv_expiry_delta: u16,
        pub(crate) htlc_minimum_msat: u64,
        pub(crate) fee_base_msat: u32,
        pub(crate) fee_proportional_millionths: u32,
        pub(crate) excess_data: Vec<u8>,
}
/// A channel_update message to be sent or received from a peer
#[derive(PartialEq, Clone, Debug)]
pub struct ChannelUpdate {
        pub(crate) signature: Signature,
        pub(crate) contents: UnsignedChannelUpdate,
}

/// Used to put an error message in a LightningError
#[derive(Clone)]
pub enum ErrorAction {
        /// The peer took some action which made us think they were useless. Disconnect them.
        DisconnectPeer {
                /// An error message which we should make an effort to send before we disconnect.
                msg: Option<ErrorMessage>
        },
        /// The peer did something harmless that we weren't able to process, just log and ignore
        IgnoreError,
        /// The peer did something incorrect. Tell them.
        SendErrorMessage {
                /// The message to send.
                msg: ErrorMessage
        },
}

/// An Err type for failure to process messages.
pub struct LightningError {
        /// A human-readable message describing the error
        pub err: &'static str,
        /// The action which should be taken against the offending peer.
        pub action: ErrorAction,
}

/// Struct used to return values from revoke_and_ack messages, containing a bunch of commitment
/// transaction updates if they were pending.
#[derive(PartialEq, Clone)]
pub struct CommitmentUpdate {
        /// update_add_htlc messages which should be sent
        pub update_add_htlcs: Vec<UpdateAddHTLC>,
        /// update_fulfill_htlc messages which should be sent
        pub update_fulfill_htlcs: Vec<UpdateFulfillHTLC>,
        /// update_fail_htlc messages which should be sent
        pub update_fail_htlcs: Vec<UpdateFailHTLC>,
        /// update_fail_malformed_htlc messages which should be sent
        pub update_fail_malformed_htlcs: Vec<UpdateFailMalformedHTLC>,
        /// An update_fee message which should be sent
        pub update_fee: Option<UpdateFee>,
        /// Finally, the commitment_signed message which should be sent
        pub commitment_signed: CommitmentSigned,
}

/// The information we received from a peer along the route of a payment we originated. This is
/// returned by ChannelMessageHandler::handle_update_fail_htlc to be passed into
/// RoutingMessageHandler::handle_htlc_fail_channel_update to update our network map.
#[derive(Clone)]
pub enum HTLCFailChannelUpdate {
        /// We received an error which included a full ChannelUpdate message.
        ChannelUpdateMessage {
                /// The unwrapped message we received
                msg: ChannelUpdate,
        },
        /// We received an error which indicated only that a channel has been closed
        ChannelClosed {
                /// The short_channel_id which has now closed.
                short_channel_id: u64,
                /// when this true, this channel should be permanently removed from the
                /// consideration. Otherwise, this channel can be restored as new channel_update is received
                is_permanent: bool,
        },
        /// We received an error which indicated only that a node has failed
        NodeFailure {
                /// The node_id that has failed.
                node_id: PublicKey,
                /// when this true, node should be permanently removed from the
                /// consideration. Otherwise, the channels connected to this node can be
                /// restored as new channel_update is received
                is_permanent: bool,
        }
}

/// Messages could have optional fields to use with extended features
/// As we wish to serialize these differently from Option<T>s (Options get a tag byte, but
/// OptionalFeild simply gets Present if there are enough bytes to read into it), we have a
/// separate enum type for them.
#[derive(Clone, PartialEq)]
pub enum OptionalField<T> {
        /// Optional field is included in message
        Present(T),
        /// Optional field is absent in message
        Absent
}

/// A trait to describe an object which can receive channel messages.
///
/// Messages MAY be called in parallel when they originate from different their_node_ids, however
/// they MUST NOT be called in parallel when the two calls have the same their_node_id.
pub trait ChannelMessageHandler : events::MessageSendEventsProvider + Send + Sync {
        //Channel init:
        /// Handle an incoming open_channel message from the given peer.
        fn handle_open_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &OpenChannel);
        /// Handle an incoming accept_channel message from the given peer.
        fn handle_accept_channel(&self, their_node_id: &PublicKey, their_features: InitFeatures, msg: &AcceptChannel);
        /// Handle an incoming funding_created message from the given peer.
        fn handle_funding_created(&self, their_node_id: &PublicKey, msg: &FundingCreated);
        /// Handle an incoming funding_signed message from the given peer.
        fn handle_funding_signed(&self, their_node_id: &PublicKey, msg: &FundingSigned);
        /// Handle an incoming funding_locked message from the given peer.
        fn handle_funding_locked(&self, their_node_id: &PublicKey, msg: &FundingLocked);

        // Channl close:
        /// Handle an incoming shutdown message from the given peer.
        fn handle_shutdown(&self, their_node_id: &PublicKey, msg: &Shutdown);
        /// Handle an incoming closing_signed message from the given peer.
        fn handle_closing_signed(&self, their_node_id: &PublicKey, msg: &ClosingSigned);

        // HTLC handling:
        /// Handle an incoming update_add_htlc message from the given peer.
        fn handle_update_add_htlc(&self, their_node_id: &PublicKey, msg: &UpdateAddHTLC);
        /// Handle an incoming update_fulfill_htlc message from the given peer.
        fn handle_update_fulfill_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFulfillHTLC);
        /// Handle an incoming update_fail_htlc message from the given peer.
        fn handle_update_fail_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailHTLC);
        /// Handle an incoming update_fail_malformed_htlc message from the given peer.
        fn handle_update_fail_malformed_htlc(&self, their_node_id: &PublicKey, msg: &UpdateFailMalformedHTLC);
        /// Handle an incoming commitment_signed message from the given peer.
        fn handle_commitment_signed(&self, their_node_id: &PublicKey, msg: &CommitmentSigned);
        /// Handle an incoming revoke_and_ack message from the given peer.
        fn handle_revoke_and_ack(&self, their_node_id: &PublicKey, msg: &RevokeAndACK);

        /// Handle an incoming update_fee message from the given peer.
        fn handle_update_fee(&self, their_node_id: &PublicKey, msg: &UpdateFee);

        // Channel-to-announce:
        /// Handle an incoming announcement_signatures message from the given peer.
        fn handle_announcement_signatures(&self, their_node_id: &PublicKey, msg: &AnnouncementSignatures);

        // Connection loss/reestablish:
        /// Indicates a connection to the peer failed/an existing connection was lost. If no connection
        /// is believed to be possible in the future (eg they're sending us messages we don't
        /// understand or indicate they require unknown feature bits), no_connection_possible is set
        /// and any outstanding channels should be failed.
        fn peer_disconnected(&self, their_node_id: &PublicKey, no_connection_possible: bool);

        /// Handle a peer reconnecting, possibly generating channel_reestablish message(s).
        fn peer_connected(&self, their_node_id: &PublicKey, msg: &Init);
        /// Handle an incoming channel_reestablish message from the given peer.
        fn handle_channel_reestablish(&self, their_node_id: &PublicKey, msg: &ChannelReestablish);

        // Error:
        /// Handle an incoming error message from the given peer.
        fn handle_error(&self, their_node_id: &PublicKey, msg: &ErrorMessage);
}

/// A trait to describe an object which can receive routing messages.
pub trait RoutingMessageHandler : Send + Sync {
        /// Handle an incoming node_announcement message, returning true if it should be forwarded on,
        /// false or returning an Err otherwise.
        fn handle_node_announcement(&self, msg: &NodeAnnouncement) -> Result<bool, LightningError>;
        /// Handle a channel_announcement message, returning true if it should be forwarded on, false
        /// or returning an Err otherwise.
        fn handle_channel_announcement(&self, msg: &ChannelAnnouncement) -> Result<bool, LightningError>;
        /// Handle an incoming channel_update message, returning true if it should be forwarded on,
        /// false or returning an Err otherwise.
        fn handle_channel_update(&self, msg: &ChannelUpdate) -> Result<bool, LightningError>;
        /// Handle some updates to the route graph that we learned due to an outbound failed payment.
        fn handle_htlc_fail_channel_update(&self, update: &HTLCFailChannelUpdate);
        /// Gets a subset of the channel announcements and updates required to dump our routing table
        /// to a remote node, starting at the short_channel_id indicated by starting_point and
        /// including the batch_amount entries immediately higher in numerical value than starting_point.
        fn get_next_channel_announcements(&self, starting_point: u64, batch_amount: u8) -> Vec<(ChannelAnnouncement, Option<ChannelUpdate>, Option<ChannelUpdate>)>;
        /// Gets a subset of the node announcements required to dump our routing table to a remote node,
        /// starting at the node *after* the provided publickey and including batch_amount entries
        /// immediately higher (as defined by <PublicKey as Ord>::cmp) than starting_point.
        /// If None is provided for starting_point, we start at the first node.
        fn get_next_node_announcements(&self, starting_point: Option<&PublicKey>, batch_amount: u8) -> Vec<NodeAnnouncement>;
        /// Returns whether a full sync should be requested from a peer.
        fn should_request_full_sync(&self, node_id: &PublicKey) -> bool;
}

mod fuzzy_internal_msgs {
        use ln::channelmanager::PaymentSecret;

        // These types aren't intended to be pub, but are exposed for direct fuzzing (as we deserialize
        // them from untrusted input):
        #[derive(Clone)]
        pub(crate) struct FinalOnionHopData {
                pub(crate) payment_secret: PaymentSecret,
                pub(crate) total_msat: u64,
        }

        pub(crate) enum OnionHopDataFormat {
                Legacy { // aka Realm-0
                        short_channel_id: u64,
                },
                NonFinalNode {
                        short_channel_id: u64,
                },
                FinalNode {
                        payment_data: Option<FinalOnionHopData>,
                },
        }

        pub struct OnionHopData {
                pub(crate) format: OnionHopDataFormat,
                pub(crate) amt_to_forward: u64,
                pub(crate) outgoing_cltv_value: u32,
                // 12 bytes of 0-padding for Legacy format
        }

        pub struct DecodedOnionErrorPacket {
                pub(crate) hmac: [u8; 32],
                pub(crate) failuremsg: Vec<u8>,
                pub(crate) pad: Vec<u8>,
        }
}
#[cfg(feature = "fuzztarget")]
pub use self::fuzzy_internal_msgs::*;
#[cfg(not(feature = "fuzztarget"))]
pub(crate) use self::fuzzy_internal_msgs::*;

#[derive(Clone)]
pub(crate) struct OnionPacket {
        pub(crate) version: u8,
        /// In order to ensure we always return an error on Onion decode in compliance with BOLT 4, we
        /// have to deserialize OnionPackets contained in UpdateAddHTLCs even if the ephemeral public
        /// key (here) is bogus, so we hold a Result instead of a PublicKey as we'd like.
        pub(crate) public_key: Result<PublicKey, secp256k1::Error>,
        pub(crate) hop_data: [u8; 20*65],
        pub(crate) hmac: [u8; 32],
}

impl PartialEq for OnionPacket {
        fn eq(&self, other: &OnionPacket) -> bool {
                for (i, j) in self.hop_data.iter().zip(other.hop_data.iter()) {
                        if i != j { return false; }
                }
                self.version == other.version &&
                        self.public_key == other.public_key &&
                        self.hmac == other.hmac
        }
}

#[derive(Clone, PartialEq)]
pub(crate) struct OnionErrorPacket {
        // This really should be a constant size slice, but the spec lets these things be up to 128KB?
        // (TODO) We limit it in decode to much lower...
        pub(crate) data: Vec<u8>,
}

impl Error for DecodeError {
        fn description(&self) -> &str {
                match *self {
                        DecodeError::UnknownVersion => "Unknown realm byte in Onion packet",
                        DecodeError::UnknownRequiredFeature => "Unknown required feature preventing decode",
                        DecodeError::InvalidValue => "Nonsense bytes didn't map to the type they were interpreted as",
                        DecodeError::ShortRead => "Packet extended beyond the provided bytes",
                        DecodeError::BadLengthDescriptor => "A length descriptor in the packet didn't describe the later data correctly",
                        DecodeError::Io(ref e) => e.description(),
                }
        }
}
impl fmt::Display for DecodeError {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.write_str(self.description())
        }
}

impl fmt::Debug for LightningError {
        fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
                f.write_str(self.err)
        }
}

impl From<::std::io::Error> for DecodeError {
        fn from(e: ::std::io::Error) -> Self {
                if e.kind() == ::std::io::ErrorKind::UnexpectedEof {
                        DecodeError::ShortRead
                } else {
                        DecodeError::Io(e)
                }
        }
}

impl Writeable for OptionalField<Script> {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                match *self {
                        OptionalField::Present(ref script) => {
                                // Note that Writeable for script includes the 16-bit length tag for us
                                script.write(w)?;
                        },
                        OptionalField::Absent => {}
                }
                Ok(())
        }
}

impl Readable for OptionalField<Script> {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                match <u16 as Readable>::read(r) {
                        Ok(len) => {
                                let mut buf = vec![0; len as usize];
                                r.read_exact(&mut buf)?;
                                Ok(OptionalField::Present(Script::from(buf)))
                        },
                        Err(DecodeError::ShortRead) => Ok(OptionalField::Absent),
                        Err(e) => Err(e)
                }
        }
}

impl_writeable_len_match!(AcceptChannel, {
                {AcceptChannel{ shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 270 + 2 + script.len()},
                {_, 270}
        }, {
        temporary_channel_id,
        dust_limit_satoshis,
        max_htlc_value_in_flight_msat,
        channel_reserve_satoshis,
        htlc_minimum_msat,
        minimum_depth,
        to_self_delay,
        max_accepted_htlcs,
        funding_pubkey,
        revocation_basepoint,
        payment_basepoint,
        delayed_payment_basepoint,
        htlc_basepoint,
        first_per_commitment_point,
        shutdown_scriptpubkey
});

impl_writeable!(AnnouncementSignatures, 32+8+64*2, {
        channel_id,
        short_channel_id,
        node_signature,
        bitcoin_signature
});

impl Writeable for ChannelReestablish {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(if let OptionalField::Present(..) = self.data_loss_protect { 32+2*8+33+32 } else { 32+2*8 });
                self.channel_id.write(w)?;
                self.next_local_commitment_number.write(w)?;
                self.next_remote_commitment_number.write(w)?;
                match self.data_loss_protect {
                        OptionalField::Present(ref data_loss_protect) => {
                                (*data_loss_protect).your_last_per_commitment_secret.write(w)?;
                                (*data_loss_protect).my_current_per_commitment_point.write(w)?;
                        },
                        OptionalField::Absent => {}
                }
                Ok(())
        }
}

impl Readable for ChannelReestablish{
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Self {
                        channel_id: Readable::read(r)?,
                        next_local_commitment_number: Readable::read(r)?,
                        next_remote_commitment_number: Readable::read(r)?,
                        data_loss_protect: {
                                match <[u8; 32] as Readable>::read(r) {
                                        Ok(your_last_per_commitment_secret) =>
                                                OptionalField::Present(DataLossProtect {
                                                        your_last_per_commitment_secret,
                                                        my_current_per_commitment_point: Readable::read(r)?,
                                                }),
                                        Err(DecodeError::ShortRead) => OptionalField::Absent,
                                        Err(e) => return Err(e)
                                }
                        }
                })
        }
}

impl_writeable!(ClosingSigned, 32+8+64, {
        channel_id,
        fee_satoshis,
        signature
});

impl_writeable_len_match!(CommitmentSigned, {
                { CommitmentSigned { ref htlc_signatures, .. }, 32+64+2+htlc_signatures.len()*64 }
        }, {
        channel_id,
        signature,
        htlc_signatures
});

impl_writeable_len_match!(DecodedOnionErrorPacket, {
                { DecodedOnionErrorPacket { ref failuremsg, ref pad, .. }, 32 + 4 + failuremsg.len() + pad.len() }
        }, {
        hmac,
        failuremsg,
        pad
});

impl_writeable!(FundingCreated, 32+32+2+64, {
        temporary_channel_id,
        funding_txid,
        funding_output_index,
        signature
});

impl_writeable!(FundingSigned, 32+64, {
        channel_id,
        signature
});

impl_writeable!(FundingLocked, 32+33, {
        channel_id,
        next_per_commitment_point
});

impl Writeable for Init {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                // global_features gets the bottom 13 bits of our features, and local_features gets all of
                // our relevant feature bits. This keeps us compatible with old nodes.
                self.features.write_up_to_13(w)?;
                self.features.write(w)
        }
}

impl Readable for Init {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                let global_features: InitFeatures = Readable::read(r)?;
                let features: InitFeatures = Readable::read(r)?;
                Ok(Init {
                        features: features.or(global_features),
                })
        }
}

impl_writeable_len_match!(OpenChannel, {
                { OpenChannel { shutdown_scriptpubkey: OptionalField::Present(ref script), .. }, 319 + 2 + script.len() },
                { _, 319 }
        }, {
        chain_hash,
        temporary_channel_id,
        funding_satoshis,
        push_msat,
        dust_limit_satoshis,
        max_htlc_value_in_flight_msat,
        channel_reserve_satoshis,
        htlc_minimum_msat,
        feerate_per_kw,
        to_self_delay,
        max_accepted_htlcs,
        funding_pubkey,
        revocation_basepoint,
        payment_basepoint,
        delayed_payment_basepoint,
        htlc_basepoint,
        first_per_commitment_point,
        channel_flags,
        shutdown_scriptpubkey
});

impl_writeable!(RevokeAndACK, 32+32+33, {
        channel_id,
        per_commitment_secret,
        next_per_commitment_point
});

impl_writeable_len_match!(Shutdown, {
                { Shutdown { ref scriptpubkey, .. }, 32 + 2 + scriptpubkey.len() }
        }, {
        channel_id,
        scriptpubkey
});

impl_writeable_len_match!(UpdateFailHTLC, {
                { UpdateFailHTLC { ref reason, .. }, 32 + 10 + reason.data.len() }
        }, {
        channel_id,
        htlc_id,
        reason
});

impl_writeable!(UpdateFailMalformedHTLC, 32+8+32+2, {
        channel_id,
        htlc_id,
        sha256_of_onion,
        failure_code
});

impl_writeable!(UpdateFee, 32+4, {
        channel_id,
        feerate_per_kw
});

impl_writeable!(UpdateFulfillHTLC, 32+8+32, {
        channel_id,
        htlc_id,
        payment_preimage
});

impl_writeable_len_match!(OnionErrorPacket, {
                { OnionErrorPacket { ref data, .. }, 2 + data.len() }
        }, {
        data
});

impl Writeable for OnionPacket {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(1 + 33 + 20*65 + 32);
                self.version.write(w)?;
                match self.public_key {
                        Ok(pubkey) => pubkey.write(w)?,
                        Err(_) => [0u8;33].write(w)?,
                }
                w.write_all(&self.hop_data)?;
                self.hmac.write(w)?;
                Ok(())
        }
}

impl Readable for OnionPacket {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(OnionPacket {
                        version: Readable::read(r)?,
                        public_key: {
                                let mut buf = [0u8;33];
                                r.read_exact(&mut buf)?;
                                PublicKey::from_slice(&buf)
                        },
                        hop_data: Readable::read(r)?,
                        hmac: Readable::read(r)?,
                })
        }
}

impl_writeable!(UpdateAddHTLC, 32+8+8+32+4+1366, {
        channel_id,
        htlc_id,
        amount_msat,
        payment_hash,
        cltv_expiry,
        onion_routing_packet
});

impl Writeable for FinalOnionHopData {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(32 + 8 - (self.total_msat.leading_zeros()/8) as usize);
                self.payment_secret.0.write(w)?;
                HighZeroBytesDroppedVarInt(self.total_msat).write(w)
        }
}

impl Readable for FinalOnionHopData {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                let secret: [u8; 32] = Readable::read(r)?;
                let amt: HighZeroBytesDroppedVarInt<u64> = Readable::read(r)?;
                Ok(Self { payment_secret: PaymentSecret(secret), total_msat: amt.0 })
        }
}

impl Writeable for OnionHopData {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(33);
                match self.format {
                        OnionHopDataFormat::Legacy { short_channel_id } => {
                                0u8.write(w)?;
                                short_channel_id.write(w)?;
                                self.amt_to_forward.write(w)?;
                                self.outgoing_cltv_value.write(w)?;
                                w.write_all(&[0;12])?;
                        },
                        OnionHopDataFormat::NonFinalNode { short_channel_id } => {
                                encode_varint_length_prefixed_tlv!(w, {
                                        (2, HighZeroBytesDroppedVarInt(self.amt_to_forward)),
                                        (4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value)),
                                        (6, short_channel_id)
                                });
                        },
                        OnionHopDataFormat::FinalNode { payment_data: Some(ref final_data) } => {
                                encode_varint_length_prefixed_tlv!(w, {
                                        (2, HighZeroBytesDroppedVarInt(self.amt_to_forward)),
                                        (4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value)),
                                        (8, final_data)
                                });
                        },
                        OnionHopDataFormat::FinalNode { payment_data: None } => {
                                encode_varint_length_prefixed_tlv!(w, {
                                        (2, HighZeroBytesDroppedVarInt(self.amt_to_forward)),
                                        (4, HighZeroBytesDroppedVarInt(self.outgoing_cltv_value))
                                });
                        },
                }
                Ok(())
        }
}

impl Readable for OnionHopData {
        fn read<R: Read>(mut r: &mut R) -> Result<Self, DecodeError> {
                use bitcoin::consensus::encode::{Decodable, Error, VarInt};
                let v: VarInt = Decodable::consensus_decode(&mut r)
                        .map_err(|e| match e {
                                Error::Io(ioe) => DecodeError::from(ioe),
                                _ => DecodeError::InvalidValue
                        })?;
                const LEGACY_ONION_HOP_FLAG: u64 = 0;
                let (format, amt, cltv_value) = if v.0 != LEGACY_ONION_HOP_FLAG {
                        let mut rd = FixedLengthReader::new(r, v.0);
                        let mut amt = HighZeroBytesDroppedVarInt(0u64);
                        let mut cltv_value = HighZeroBytesDroppedVarInt(0u32);
                        let mut short_id: Option<u64> = None;
                        let mut payment_data: Option<FinalOnionHopData> = None;
                        decode_tlv!(&mut rd, {
                                (2, amt),
                                (4, cltv_value)
                        }, {
                                (6, short_id),
                                (8, payment_data)
                        });
                        rd.eat_remaining().map_err(|_| DecodeError::ShortRead)?;
                        let format = if let Some(short_channel_id) = short_id {
                                if payment_data.is_some() { return Err(DecodeError::InvalidValue); }
                                OnionHopDataFormat::NonFinalNode {
                                        short_channel_id,
                                }
                        } else {
                                if let &Some(ref data) = &payment_data {
                                        if data.total_msat > MAX_VALUE_MSAT {
                                                return Err(DecodeError::InvalidValue);
                                        }
                                }
                                OnionHopDataFormat::FinalNode {
                                        payment_data
                                }
                        };
                        (format, amt.0, cltv_value.0)
                } else {
                        let format = OnionHopDataFormat::Legacy {
                                short_channel_id: Readable::read(r)?,
                        };
                        let amt: u64 = Readable::read(r)?;
                        let cltv_value: u32 = Readable::read(r)?;
                        r.read_exact(&mut [0; 12])?;
                        (format, amt, cltv_value)
                };

                if amt > MAX_VALUE_MSAT {
                        return Err(DecodeError::InvalidValue);
                }
                Ok(OnionHopData {
                        format,
                        amt_to_forward: amt,
                        outgoing_cltv_value: cltv_value,
                })
        }
}

impl Writeable for Ping {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(self.byteslen as usize + 4);
                self.ponglen.write(w)?;
                vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
                Ok(())
        }
}

impl Readable for Ping {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Ping {
                        ponglen: Readable::read(r)?,
                        byteslen: {
                                let byteslen = Readable::read(r)?;
                                r.read_exact(&mut vec![0u8; byteslen as usize][..])?;
                                byteslen
                        }
                })
        }
}

impl Writeable for Pong {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(self.byteslen as usize + 2);
                vec![0u8; self.byteslen as usize].write(w)?; // size-unchecked write
                Ok(())
        }
}

impl Readable for Pong {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Pong {
                        byteslen: {
                                let byteslen = Readable::read(r)?;
                                r.read_exact(&mut vec![0u8; byteslen as usize][..])?;
                                byteslen
                        }
                })
        }
}

impl Writeable for UnsignedChannelAnnouncement {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(2 + 2*32 + 4*33 + self.features.byte_count() + self.excess_data.len());
                self.features.write(w)?;
                self.chain_hash.write(w)?;
                self.short_channel_id.write(w)?;
                self.node_id_1.write(w)?;
                self.node_id_2.write(w)?;
                self.bitcoin_key_1.write(w)?;
                self.bitcoin_key_2.write(w)?;
                w.write_all(&self.excess_data[..])?;
                Ok(())
        }
}

impl Readable for UnsignedChannelAnnouncement {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Self {
                        features: Readable::read(r)?,
                        chain_hash: Readable::read(r)?,
                        short_channel_id: Readable::read(r)?,
                        node_id_1: Readable::read(r)?,
                        node_id_2: Readable::read(r)?,
                        bitcoin_key_1: Readable::read(r)?,
                        bitcoin_key_2: Readable::read(r)?,
                        excess_data: {
                                let mut excess_data = vec![];
                                r.read_to_end(&mut excess_data)?;
                                excess_data
                        },
                })
        }
}

impl_writeable_len_match!(ChannelAnnouncement, {
                { ChannelAnnouncement { contents: UnsignedChannelAnnouncement {ref features, ref excess_data, ..}, .. },
                        2 + 2*32 + 4*33 + features.byte_count() + excess_data.len() + 4*64 }
        }, {
        node_signature_1,
        node_signature_2,
        bitcoin_signature_1,
        bitcoin_signature_2,
        contents
});

impl Writeable for UnsignedChannelUpdate {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(64 + self.excess_data.len());
                self.chain_hash.write(w)?;
                self.short_channel_id.write(w)?;
                self.timestamp.write(w)?;
                self.flags.write(w)?;
                self.cltv_expiry_delta.write(w)?;
                self.htlc_minimum_msat.write(w)?;
                self.fee_base_msat.write(w)?;
                self.fee_proportional_millionths.write(w)?;
                w.write_all(&self.excess_data[..])?;
                Ok(())
        }
}

impl Readable for UnsignedChannelUpdate {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Self {
                        chain_hash: Readable::read(r)?,
                        short_channel_id: Readable::read(r)?,
                        timestamp: Readable::read(r)?,
                        flags: Readable::read(r)?,
                        cltv_expiry_delta: Readable::read(r)?,
                        htlc_minimum_msat: Readable::read(r)?,
                        fee_base_msat: Readable::read(r)?,
                        fee_proportional_millionths: Readable::read(r)?,
                        excess_data: {
                                let mut excess_data = vec![];
                                r.read_to_end(&mut excess_data)?;
                                excess_data
                        },
                })
        }
}

impl_writeable_len_match!(ChannelUpdate, {
                { ChannelUpdate { contents: UnsignedChannelUpdate {ref excess_data, ..}, .. },
                        64 + excess_data.len() + 64 }
        }, {
        signature,
        contents
});

impl Writeable for ErrorMessage {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(32 + 2 + self.data.len());
                self.channel_id.write(w)?;
                (self.data.len() as u16).write(w)?;
                w.write_all(self.data.as_bytes())?;
                Ok(())
        }
}

impl Readable for ErrorMessage {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                Ok(Self {
                        channel_id: Readable::read(r)?,
                        data: {
                                let mut sz: usize = <u16 as Readable>::read(r)? as usize;
                                let mut data = vec![];
                                let data_len = r.read_to_end(&mut data)?;
                                sz = cmp::min(data_len, sz);
                                match String::from_utf8(data[..sz as usize].to_vec()) {
                                        Ok(s) => s,
                                        Err(_) => return Err(DecodeError::InvalidValue),
                                }
                        }
                })
        }
}

impl Writeable for UnsignedNodeAnnouncement {
        fn write<W: Writer>(&self, w: &mut W) -> Result<(), ::std::io::Error> {
                w.size_hint(64 + 76 + self.features.byte_count() + self.addresses.len()*38 + self.excess_address_data.len() + self.excess_data.len());
                self.features.write(w)?;
                self.timestamp.write(w)?;
                self.node_id.write(w)?;
                w.write_all(&self.rgb)?;
                self.alias.write(w)?;

                let mut addrs_to_encode = self.addresses.clone();
                addrs_to_encode.sort_by(|a, b| { a.get_id().cmp(&b.get_id()) });
                let mut addr_len = 0;
                for addr in &addrs_to_encode {
                        addr_len += 1 + addr.len();
                }
                (addr_len + self.excess_address_data.len() as u16).write(w)?;
                for addr in addrs_to_encode {
                        addr.write(w)?;
                }
                w.write_all(&self.excess_address_data[..])?;
                w.write_all(&self.excess_data[..])?;
                Ok(())
        }
}

impl Readable for UnsignedNodeAnnouncement {
        fn read<R: Read>(r: &mut R) -> Result<Self, DecodeError> {
                let features: NodeFeatures = Readable::read(r)?;
                let timestamp: u32 = Readable::read(r)?;
                let node_id: PublicKey = Readable::read(r)?;
                let mut rgb = [0; 3];
                r.read_exact(&mut rgb)?;
                let alias: [u8; 32] = Readable::read(r)?;

                let addr_len: u16 = Readable::read(r)?;
                let mut addresses: Vec<NetAddress> = Vec::new();
                let mut highest_addr_type = 0;
                let mut addr_readpos = 0;
                let mut excess = false;
                let mut excess_byte = 0;
                loop {
                        if addr_len <= addr_readpos { break; }
                        match Readable::read(r) {
                                Ok(Ok(addr)) => {
                                        if addr.get_id() < highest_addr_type {
                                                // Addresses must be sorted in increasing order
                                                return Err(DecodeError::InvalidValue);
                                        }
                                        highest_addr_type = addr.get_id();
                                        if addr_len < addr_readpos + 1 + addr.len() {
                                                return Err(DecodeError::BadLengthDescriptor);
                                        }
                                        addr_readpos += (1 + addr.len()) as u16;
                                        addresses.push(addr);
                                },
                                Ok(Err(unknown_descriptor)) => {
                                        excess = true;
                                        excess_byte = unknown_descriptor;
                                        break;
                                },
                                Err(DecodeError::ShortRead) => return Err(DecodeError::BadLengthDescriptor),
                                Err(e) => return Err(e),
                        }
                }

                let mut excess_data = vec![];
                let excess_address_data = if addr_readpos < addr_len {
                        let mut excess_address_data = vec![0; (addr_len - addr_readpos) as usize];
                        r.read_exact(&mut excess_address_data[if excess { 1 } else { 0 }..])?;
                        if excess {
                                excess_address_data[0] = excess_byte;
                        }
                        excess_address_data
                } else {
                        if excess {
                                excess_data.push(excess_byte);
                        }
                        Vec::new()
                };
                r.read_to_end(&mut excess_data)?;
                Ok(UnsignedNodeAnnouncement {
                        features,
                        timestamp,
                        node_id,
                        rgb,
                        alias,
                        addresses,
                        excess_address_data,
                        excess_data,
                })
        }
}

impl_writeable_len_match!(NodeAnnouncement, {
                { NodeAnnouncement { contents: UnsignedNodeAnnouncement { ref features, ref addresses, ref excess_address_data, ref excess_data, ..}, .. },
                        64 + 76 + features.byte_count() + addresses.len()*(NetAddress::MAX_LEN as usize + 1) + excess_address_data.len() + excess_data.len() }
        }, {
        signature,
        contents
});

#[cfg(test)]
mod tests {
        use hex;
        use ln::msgs;
        use ln::msgs::{ChannelFeatures, FinalOnionHopData, InitFeatures, NodeFeatures, OptionalField, OnionErrorPacket, OnionHopDataFormat};
        use ln::channelmanager::{PaymentPreimage, PaymentHash, PaymentSecret};
        use util::ser::{Writeable, Readable};

        use bitcoin_hashes::sha256d::Hash as Sha256dHash;
        use bitcoin_hashes::hex::FromHex;
        use bitcoin::util::address::Address;
        use bitcoin::network::constants::Network;
        use bitcoin::blockdata::script::Builder;
        use bitcoin::blockdata::opcodes;

        use secp256k1::key::{PublicKey,SecretKey};
        use secp256k1::{Secp256k1, Message};

        use std::io::Cursor;

        #[test]
        fn encoding_channel_reestablish_no_secret() {
                let cr = msgs::ChannelReestablish {
                        channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
                        next_local_commitment_number: 3,
                        next_remote_commitment_number: 4,
                        data_loss_protect: OptionalField::Absent,
                };

                let encoded_value = cr.encode();
                assert_eq!(
                        encoded_value,
                        vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4]
                );
        }

        #[test]
        fn encoding_channel_reestablish_with_secret() {
                let public_key = {
                        let secp_ctx = Secp256k1::new();
                        PublicKey::from_secret_key(&secp_ctx, &SecretKey::from_slice(&hex::decode("0101010101010101010101010101010101010101010101010101010101010101").unwrap()[..]).unwrap())
                };

                let cr = msgs::ChannelReestablish {
                        channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
                        next_local_commitment_number: 3,
                        next_remote_commitment_number: 4,
                        data_loss_protect: OptionalField::Present(msgs::DataLossProtect { your_last_per_commitment_secret: [9;32], my_current_per_commitment_point: public_key}),
                };

                let encoded_value = cr.encode();
                assert_eq!(
                        encoded_value,
                        vec![4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 3, 0, 0, 0, 0, 0, 0, 0, 4, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 3, 27, 132, 197, 86, 123, 18, 100, 64, 153, 93, 62, 213, 170, 186, 5, 101, 215, 30, 24, 52, 96, 72, 25, 255, 156, 23, 245, 233, 213, 221, 7, 143]
                );
        }

        macro_rules! get_keys_from {
                ($slice: expr, $secp_ctx: expr) => {
                        {
                                let privkey = SecretKey::from_slice(&hex::decode($slice).unwrap()[..]).unwrap();
                                let pubkey = PublicKey::from_secret_key(&$secp_ctx, &privkey);
                                (privkey, pubkey)
                        }
                }
        }

        macro_rules! get_sig_on {
                ($privkey: expr, $ctx: expr, $string: expr) => {
                        {
                                let sighash = Message::from_slice(&$string.into_bytes()[..]).unwrap();
                                $ctx.sign(&sighash, &$privkey)
                        }
                }
        }

        #[test]
        fn encoding_announcement_signatures() {
                let secp_ctx = Secp256k1::new();
                let (privkey, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_2 = get_sig_on!(privkey, secp_ctx, String::from("02020202020202020202020202020202"));
                let announcement_signatures = msgs::AnnouncementSignatures {
                        channel_id: [4, 0, 0, 0, 0, 0, 0, 0, 5, 0, 0, 0, 0, 0, 0, 0, 6, 0, 0, 0, 0, 0, 0, 0, 7, 0, 0, 0, 0, 0, 0, 0],
                        short_channel_id: 2316138423780173,
                        node_signature: sig_1,
                        bitcoin_signature: sig_2,
                };

                let encoded_value = announcement_signatures.encode();
                assert_eq!(encoded_value, hex::decode("040000000000000005000000000000000600000000000000070000000000000000083a840000034dd977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073acf9953cef4700860f5967838eba2bae89288ad188ebf8b20bf995c3ea53a26df1876d0a3a0e13172ba286a673140190c02ba9da60a2e43a745188c8a83c7f3ef").unwrap());
        }

        fn do_encoding_channel_announcement(unknown_features_bits: bool, non_bitcoin_chain_hash: bool, excess_data: bool) {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let (privkey_2, pubkey_2) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
                let (privkey_3, pubkey_3) = get_keys_from!("0303030303030303030303030303030303030303030303030303030303030303", secp_ctx);
                let (privkey_4, pubkey_4) = get_keys_from!("0404040404040404040404040404040404040404040404040404040404040404", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_2 = get_sig_on!(privkey_2, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_3 = get_sig_on!(privkey_3, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_4 = get_sig_on!(privkey_4, secp_ctx, String::from("01010101010101010101010101010101"));
                let mut features = ChannelFeatures::supported();
                if unknown_features_bits {
                        features = ChannelFeatures::from_le_bytes(vec![0xFF, 0xFF]);
                }
                let unsigned_channel_announcement = msgs::UnsignedChannelAnnouncement {
                        features,
                        chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
                        short_channel_id: 2316138423780173,
                        node_id_1: pubkey_1,
                        node_id_2: pubkey_2,
                        bitcoin_key_1: pubkey_3,
                        bitcoin_key_2: pubkey_4,
                        excess_data: if excess_data { vec![10, 0, 0, 20, 0, 0, 30, 0, 0, 40] } else { Vec::new() },
                };
                let channel_announcement = msgs::ChannelAnnouncement {
                        node_signature_1: sig_1,
                        node_signature_2: sig_2,
                        bitcoin_signature_1: sig_3,
                        bitcoin_signature_2: sig_4,
                        contents: unsigned_channel_announcement,
                };
                let encoded_value = channel_announcement.encode();
                let mut target_value = hex::decode("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").unwrap();
                if unknown_features_bits {
                        target_value.append(&mut hex::decode("0002ffff").unwrap());
                } else {
                        target_value.append(&mut hex::decode("0000").unwrap());
                }
                if non_bitcoin_chain_hash {
                        target_value.append(&mut hex::decode("43497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000").unwrap());
                } else {
                        target_value.append(&mut hex::decode("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f").unwrap());
                }
                target_value.append(&mut hex::decode("00083a840000034d031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f024d4b6cd1361032ca9bd2aeb9d900aa4d45d9ead80ac9423374c451a7254d076602531fe6068134503d2723133227c867ac8fa6c83c537e9a44c3c5bdbdcb1fe33703462779ad4aad39514614751a71085f2f10e1c7a593e4e030efb5b8721ce55b0b").unwrap());
                if excess_data {
                        target_value.append(&mut hex::decode("0a00001400001e000028").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_channel_announcement() {
                do_encoding_channel_announcement(false, false, false);
                do_encoding_channel_announcement(true, false, false);
                do_encoding_channel_announcement(true, true, false);
                do_encoding_channel_announcement(true, true, true);
                do_encoding_channel_announcement(false, true, true);
                do_encoding_channel_announcement(false, false, true);
                do_encoding_channel_announcement(false, true, false);
                do_encoding_channel_announcement(true, false, true);
        }

        fn do_encoding_node_announcement(unknown_features_bits: bool, ipv4: bool, ipv6: bool, onionv2: bool, onionv3: bool, excess_address_data: bool, excess_data: bool) {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let features = if unknown_features_bits {
                        NodeFeatures::from_le_bytes(vec![0xFF, 0xFF])
                } else {
                        // Set to some features we may support
                        NodeFeatures::from_le_bytes(vec![2 | 1 << 5])
                };
                let mut addresses = Vec::new();
                if ipv4 {
                        addresses.push(msgs::NetAddress::IPv4 {
                                addr: [255, 254, 253, 252],
                                port: 9735
                        });
                }
                if ipv6 {
                        addresses.push(msgs::NetAddress::IPv6 {
                                addr: [255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240],
                                port: 9735
                        });
                }
                if onionv2 {
                        addresses.push(msgs::NetAddress::OnionV2 {
                                addr: [255, 254, 253, 252, 251, 250, 249, 248, 247, 246],
                                port: 9735
                        });
                }
                if onionv3 {
                        addresses.push(msgs::NetAddress::OnionV3 {
                                ed25519_pubkey: [255, 254, 253, 252, 251, 250, 249, 248, 247, 246, 245, 244, 243, 242, 241, 240, 239, 238, 237, 236, 235, 234, 233, 232, 231, 230, 229, 228, 227, 226, 225, 224],
                                checksum: 32,
                                version: 16,
                                port: 9735
                        });
                }
                let mut addr_len = 0;
                for addr in &addresses {
                        addr_len += addr.len() + 1;
                }
                let unsigned_node_announcement = msgs::UnsignedNodeAnnouncement {
                        features,
                        timestamp: 20190119,
                        node_id: pubkey_1,
                        rgb: [32; 3],
                        alias: [16;32],
                        addresses,
                        excess_address_data: if excess_address_data { vec![33, 108, 40, 11, 83, 149, 162, 84, 110, 126, 75, 38, 99, 224, 79, 129, 22, 34, 241, 90, 79, 146, 232, 58, 162, 233, 43, 162, 165, 115, 193, 57, 20, 44, 84, 174, 99, 7, 42, 30, 193, 238, 125, 192, 192, 75, 222, 92, 132, 120, 6, 23, 42, 160, 92, 146, 194, 42, 232, 227, 8, 209, 210, 105] } else { Vec::new() },
                        excess_data: if excess_data { vec![59, 18, 204, 25, 92, 224, 162, 209, 189, 166, 168, 139, 239, 161, 159, 160, 127, 81, 202, 167, 92, 232, 56, 55, 242, 137, 101, 96, 11, 138, 172, 171, 8, 85, 255, 176, 231, 65, 236, 95, 124, 65, 66, 30, 152, 41, 169, 212, 134, 17, 200, 200, 49, 247, 27, 229, 234, 115, 230, 101, 148, 151, 127, 253] } else { Vec::new() },
                };
                addr_len += unsigned_node_announcement.excess_address_data.len() as u16;
                let node_announcement = msgs::NodeAnnouncement {
                        signature: sig_1,
                        contents: unsigned_node_announcement,
                };
                let encoded_value = node_announcement.encode();
                let mut target_value = hex::decode("d977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                if unknown_features_bits {
                        target_value.append(&mut hex::decode("0002ffff").unwrap());
                } else {
                        target_value.append(&mut hex::decode("000122").unwrap());
                }
                target_value.append(&mut hex::decode("013413a7031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f2020201010101010101010101010101010101010101010101010101010101010101010").unwrap());
                target_value.append(&mut vec![(addr_len >> 8) as u8, addr_len as u8]);
                if ipv4 {
                        target_value.append(&mut hex::decode("01fffefdfc2607").unwrap());
                }
                if ipv6 {
                        target_value.append(&mut hex::decode("02fffefdfcfbfaf9f8f7f6f5f4f3f2f1f02607").unwrap());
                }
                if onionv2 {
                        target_value.append(&mut hex::decode("03fffefdfcfbfaf9f8f7f62607").unwrap());
                }
                if onionv3 {
                        target_value.append(&mut hex::decode("04fffefdfcfbfaf9f8f7f6f5f4f3f2f1f0efeeedecebeae9e8e7e6e5e4e3e2e1e00020102607").unwrap());
                }
                if excess_address_data {
                        target_value.append(&mut hex::decode("216c280b5395a2546e7e4b2663e04f811622f15a4f92e83aa2e92ba2a573c139142c54ae63072a1ec1ee7dc0c04bde5c847806172aa05c92c22ae8e308d1d269").unwrap());
                }
                if excess_data {
                        target_value.append(&mut hex::decode("3b12cc195ce0a2d1bda6a88befa19fa07f51caa75ce83837f28965600b8aacab0855ffb0e741ec5f7c41421e9829a9d48611c8c831f71be5ea73e66594977ffd").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_node_announcement() {
                do_encoding_node_announcement(true, true, true, true, true, true, true);
                do_encoding_node_announcement(false, false, false, false, false, false, false);
                do_encoding_node_announcement(false, true, false, false, false, false, false);
                do_encoding_node_announcement(false, false, true, false, false, false, false);
                do_encoding_node_announcement(false, false, false, true, false, false, false);
                do_encoding_node_announcement(false, false, false, false, true, false, false);
                do_encoding_node_announcement(false, false, false, false, false, true, false);
                do_encoding_node_announcement(false, true, false, true, false, true, false);
                do_encoding_node_announcement(false, false, true, false, true, false, false);
        }

        fn do_encoding_channel_update(non_bitcoin_chain_hash: bool, direction: bool, disable: bool, htlc_maximum_msat: bool) {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let unsigned_channel_update = msgs::UnsignedChannelUpdate {
                        chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
                        short_channel_id: 2316138423780173,
                        timestamp: 20190119,
                        flags: if direction { 1 } else { 0 } | if disable { 1 << 1 } else { 0 } | if htlc_maximum_msat { 1 << 8 } else { 0 },
                        cltv_expiry_delta: 144,
                        htlc_minimum_msat: 1000000,
                        fee_base_msat: 10000,
                        fee_proportional_millionths: 20,
                        excess_data: if htlc_maximum_msat { vec![0, 0, 0, 0, 59, 154, 202, 0] } else { Vec::new() }
                };
                let channel_update = msgs::ChannelUpdate {
                        signature: sig_1,
                        contents: unsigned_channel_update
                };
                let encoded_value = channel_update.encode();
                let mut target_value = hex::decode("d977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                if non_bitcoin_chain_hash {
                        target_value.append(&mut hex::decode("43497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000").unwrap());
                } else {
                        target_value.append(&mut hex::decode("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f").unwrap());
                }
                target_value.append(&mut hex::decode("00083a840000034d013413a7").unwrap());
                if htlc_maximum_msat {
                        target_value.append(&mut hex::decode("01").unwrap());
                } else {
                        target_value.append(&mut hex::decode("00").unwrap());
                }
                target_value.append(&mut hex::decode("00").unwrap());
                if direction {
                        let flag = target_value.last_mut().unwrap();
                        *flag = 1;
                }
                if disable {
                        let flag = target_value.last_mut().unwrap();
                        *flag = *flag | 1 << 1;
                }
                target_value.append(&mut hex::decode("009000000000000f42400000271000000014").unwrap());
                if htlc_maximum_msat {
                        target_value.append(&mut hex::decode("000000003b9aca00").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_channel_update() {
                do_encoding_channel_update(false, false, false, false);
                do_encoding_channel_update(true, false, false, false);
                do_encoding_channel_update(false, true, false, false);
                do_encoding_channel_update(false, false, true, false);
                do_encoding_channel_update(false, false, false, true);
                do_encoding_channel_update(true, true, true, true);
        }

        fn do_encoding_open_channel(non_bitcoin_chain_hash: bool, random_bit: bool, shutdown: bool) {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let (_, pubkey_2) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
                let (_, pubkey_3) = get_keys_from!("0303030303030303030303030303030303030303030303030303030303030303", secp_ctx);
                let (_, pubkey_4) = get_keys_from!("0404040404040404040404040404040404040404040404040404040404040404", secp_ctx);
                let (_, pubkey_5) = get_keys_from!("0505050505050505050505050505050505050505050505050505050505050505", secp_ctx);
                let (_, pubkey_6) = get_keys_from!("0606060606060606060606060606060606060606060606060606060606060606", secp_ctx);
                let open_channel = msgs::OpenChannel {
                        chain_hash: if !non_bitcoin_chain_hash { Sha256dHash::from_hex("6fe28c0ab6f1b372c1a6a246ae63f74f931e8365e15a089c68d6190000000000").unwrap() } else { Sha256dHash::from_hex("000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943").unwrap() },
                        temporary_channel_id: [2; 32],
                        funding_satoshis: 1311768467284833366,
                        push_msat: 2536655962884945560,
                        dust_limit_satoshis: 3608586615801332854,
                        max_htlc_value_in_flight_msat: 8517154655701053848,
                        channel_reserve_satoshis: 8665828695742877976,
                        htlc_minimum_msat: 2316138423780173,
                        feerate_per_kw: 821716,
                        to_self_delay: 49340,
                        max_accepted_htlcs: 49340,
                        funding_pubkey: pubkey_1,
                        revocation_basepoint: pubkey_2,
                        payment_basepoint: pubkey_3,
                        delayed_payment_basepoint: pubkey_4,
                        htlc_basepoint: pubkey_5,
                        first_per_commitment_point: pubkey_6,
                        channel_flags: if random_bit { 1 << 5 } else { 0 },
                        shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent }
                };
                let encoded_value = open_channel.encode();
                let mut target_value = Vec::new();
                if non_bitcoin_chain_hash {
                        target_value.append(&mut hex::decode("43497fd7f826957108f4a30fd9cec3aeba79972084e90ead01ea330900000000").unwrap());
                } else {
                        target_value.append(&mut hex::decode("000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f").unwrap());
                }
                target_value.append(&mut hex::decode("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").unwrap());
                if random_bit {
                        target_value.append(&mut hex::decode("20").unwrap());
                } else {
                        target_value.append(&mut hex::decode("00").unwrap());
                }
                if shutdown {
                        target_value.append(&mut hex::decode("001976a91479b000887626b294a914501a4cd226b58b23598388ac").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_open_channel() {
                do_encoding_open_channel(false, false, false);
                do_encoding_open_channel(true, false, false);
                do_encoding_open_channel(false, true, false);
                do_encoding_open_channel(false, false, true);
                do_encoding_open_channel(true, true, true);
        }

        fn do_encoding_accept_channel(shutdown: bool) {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let (_, pubkey_2) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
                let (_, pubkey_3) = get_keys_from!("0303030303030303030303030303030303030303030303030303030303030303", secp_ctx);
                let (_, pubkey_4) = get_keys_from!("0404040404040404040404040404040404040404040404040404040404040404", secp_ctx);
                let (_, pubkey_5) = get_keys_from!("0505050505050505050505050505050505050505050505050505050505050505", secp_ctx);
                let (_, pubkey_6) = get_keys_from!("0606060606060606060606060606060606060606060606060606060606060606", secp_ctx);
                let accept_channel = msgs::AcceptChannel {
                        temporary_channel_id: [2; 32],
                        dust_limit_satoshis: 1311768467284833366,
                        max_htlc_value_in_flight_msat: 2536655962884945560,
                        channel_reserve_satoshis: 3608586615801332854,
                        htlc_minimum_msat: 2316138423780173,
                        minimum_depth: 821716,
                        to_self_delay: 49340,
                        max_accepted_htlcs: 49340,
                        funding_pubkey: pubkey_1,
                        revocation_basepoint: pubkey_2,
                        payment_basepoint: pubkey_3,
                        delayed_payment_basepoint: pubkey_4,
                        htlc_basepoint: pubkey_5,
                        first_per_commitment_point: pubkey_6,
                        shutdown_scriptpubkey: if shutdown { OptionalField::Present(Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey()) } else { OptionalField::Absent }
                };
                let encoded_value = accept_channel.encode();
                let mut target_value = hex::decode("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").unwrap();
                if shutdown {
                        target_value.append(&mut hex::decode("001976a91479b000887626b294a914501a4cd226b58b23598388ac").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_accept_channel() {
                do_encoding_accept_channel(false);
                do_encoding_accept_channel(true);
        }

        #[test]
        fn encoding_funding_created() {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let funding_created = msgs::FundingCreated {
                        temporary_channel_id: [2; 32],
                        funding_txid: Sha256dHash::from_hex("c2d4449afa8d26140898dd54d3390b057ba2a5afcf03ba29d7dc0d8b9ffe966e").unwrap(),
                        funding_output_index: 255,
                        signature: sig_1,
                };
                let encoded_value = funding_created.encode();
                let target_value = hex::decode("02020202020202020202020202020202020202020202020202020202020202026e96fe9f8b0ddcd729ba03cfafa5a27b050b39d354dd980814268dfa9a44d4c200ffd977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_funding_signed() {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let funding_signed = msgs::FundingSigned {
                        channel_id: [2; 32],
                        signature: sig_1,
                };
                let encoded_value = funding_signed.encode();
                let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202d977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_funding_locked() {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1,) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let funding_locked = msgs::FundingLocked {
                        channel_id: [2; 32],
                        next_per_commitment_point: pubkey_1,
                };
                let encoded_value = funding_locked.encode();
                let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        fn do_encoding_shutdown(script_type: u8) {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let script = Builder::new().push_opcode(opcodes::OP_TRUE).into_script();
                let shutdown = msgs::Shutdown {
                        channel_id: [2; 32],
                        scriptpubkey: if script_type == 1 { Address::p2pkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey() } else if script_type == 2 { Address::p2sh(&script, Network::Testnet).script_pubkey() } else if script_type == 3 { Address::p2wpkh(&::bitcoin::PublicKey{compressed: true, key: pubkey_1}, Network::Testnet).script_pubkey() } else { Address::p2wsh(&script, Network::Testnet).script_pubkey() },
                };
                let encoded_value = shutdown.encode();
                let mut target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202").unwrap();
                if script_type == 1 {
                        target_value.append(&mut hex::decode("001976a91479b000887626b294a914501a4cd226b58b23598388ac").unwrap());
                } else if script_type == 2 {
                        target_value.append(&mut hex::decode("0017a914da1745e9b549bd0bfa1a569971c77eba30cd5a4b87").unwrap());
                } else if script_type == 3 {
                        target_value.append(&mut hex::decode("0016001479b000887626b294a914501a4cd226b58b235983").unwrap());
                } else if script_type == 4 {
                        target_value.append(&mut hex::decode("002200204ae81572f06e1b88fd5ced7a1a000945432e83e1551e6f721ee9c00b8cc33260").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_shutdown() {
                do_encoding_shutdown(1);
                do_encoding_shutdown(2);
                do_encoding_shutdown(3);
                do_encoding_shutdown(4);
        }

        #[test]
        fn encoding_closing_signed() {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let closing_signed = msgs::ClosingSigned {
                        channel_id: [2; 32],
                        fee_satoshis: 2316138423780173,
                        signature: sig_1,
                };
                let encoded_value = closing_signed.encode();
                let target_value = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034dd977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_update_add_htlc() {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let onion_routing_packet = msgs::OnionPacket {
                        version: 255,
                        public_key: Ok(pubkey_1),
                        hop_data: [1; 20*65],
                        hmac: [2; 32]
                };
                let update_add_htlc = msgs::UpdateAddHTLC {
                        channel_id: [2; 32],
                        htlc_id: 2316138423780173,
                        amount_msat: 3608586615801332854,
                        payment_hash: PaymentHash([1; 32]),
                        cltv_expiry: 821716,
                        onion_routing_packet
                };
                let encoded_value = update_add_htlc.encode();
                let target_value = hex::decode("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").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_update_fulfill_htlc() {
                let update_fulfill_htlc = msgs::UpdateFulfillHTLC {
                        channel_id: [2; 32],
                        htlc_id: 2316138423780173,
                        payment_preimage: PaymentPreimage([1; 32]),
                };
                let encoded_value = update_fulfill_htlc.encode();
                let target_value = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034d0101010101010101010101010101010101010101010101010101010101010101").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_update_fail_htlc() {
                let reason = OnionErrorPacket {
                        data: [1; 32].to_vec(),
                };
                let update_fail_htlc = msgs::UpdateFailHTLC {
                        channel_id: [2; 32],
                        htlc_id: 2316138423780173,
                        reason
                };
                let encoded_value = update_fail_htlc.encode();
                let target_value = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034d00200101010101010101010101010101010101010101010101010101010101010101").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_update_fail_malformed_htlc() {
                let update_fail_malformed_htlc = msgs::UpdateFailMalformedHTLC {
                        channel_id: [2; 32],
                        htlc_id: 2316138423780173,
                        sha256_of_onion: [1; 32],
                        failure_code: 255
                };
                let encoded_value = update_fail_malformed_htlc.encode();
                let target_value = hex::decode("020202020202020202020202020202020202020202020202020202020202020200083a840000034d010101010101010101010101010101010101010101010101010101010101010100ff").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        fn do_encoding_commitment_signed(htlcs: bool) {
                let secp_ctx = Secp256k1::new();
                let (privkey_1, _) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let (privkey_2, _) = get_keys_from!("0202020202020202020202020202020202020202020202020202020202020202", secp_ctx);
                let (privkey_3, _) = get_keys_from!("0303030303030303030303030303030303030303030303030303030303030303", secp_ctx);
                let (privkey_4, _) = get_keys_from!("0404040404040404040404040404040404040404040404040404040404040404", secp_ctx);
                let sig_1 = get_sig_on!(privkey_1, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_2 = get_sig_on!(privkey_2, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_3 = get_sig_on!(privkey_3, secp_ctx, String::from("01010101010101010101010101010101"));
                let sig_4 = get_sig_on!(privkey_4, secp_ctx, String::from("01010101010101010101010101010101"));
                let commitment_signed = msgs::CommitmentSigned {
                        channel_id: [2; 32],
                        signature: sig_1,
                        htlc_signatures: if htlcs { vec![sig_2, sig_3, sig_4] } else { Vec::new() },
                };
                let encoded_value = commitment_signed.encode();
                let mut target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202d977cb9b53d93a6ff64bb5f1e158b4094b66e798fb12911168a3ccdf80a83096340a6a95da0ae8d9f776528eecdbb747eb6b545495a4319ed5378e35b21e073a").unwrap();
                if htlcs {
                        target_value.append(&mut hex::decode("00031735b6a427e80d5fe7cd90a2f4ee08dc9c27cda7c35a4172e5d85b12c49d4232537e98f9b1f3c5e6989a8b9644e90e8918127680dbd0d4043510840fc0f1e11a216c280b5395a2546e7e4b2663e04f811622f15a4f91e83aa2e92ba2a573c139142c54ae63072a1ec1ee7dc0c04bde5c847806172aa05c92c22ae8e308d1d2692b12cc195ce0a2d1bda6a88befa19fa07f51caa75ce83837f28965600b8aacab0855ffb0e741ec5f7c41421e9829a9d48611c8c831f71be5ea73e66594977ffd").unwrap());
                } else {
                        target_value.append(&mut hex::decode("0000").unwrap());
                }
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_commitment_signed() {
                do_encoding_commitment_signed(true);
                do_encoding_commitment_signed(false);
        }

        #[test]
        fn encoding_revoke_and_ack() {
                let secp_ctx = Secp256k1::new();
                let (_, pubkey_1) = get_keys_from!("0101010101010101010101010101010101010101010101010101010101010101", secp_ctx);
                let raa = msgs::RevokeAndACK {
                        channel_id: [2; 32],
                        per_commitment_secret: [1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1],
                        next_per_commitment_point: pubkey_1,
                };
                let encoded_value = raa.encode();
                let target_value = hex::decode("02020202020202020202020202020202020202020202020202020202020202020101010101010101010101010101010101010101010101010101010101010101031b84c5567b126440995d3ed5aaba0565d71e1834604819ff9c17f5e9d5dd078f").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_update_fee() {
                let update_fee = msgs::UpdateFee {
                        channel_id: [2; 32],
                        feerate_per_kw: 20190119,
                };
                let encoded_value = update_fee.encode();
                let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202013413a7").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_init() {
                assert_eq!(msgs::Init {
                        features: InitFeatures::from_le_bytes(vec![0xFF, 0xFF, 0xFF]),
                }.encode(), hex::decode("00023fff0003ffffff").unwrap());
                assert_eq!(msgs::Init {
                        features: InitFeatures::from_le_bytes(vec![0xFF]),
                }.encode(), hex::decode("0001ff0001ff").unwrap());
                assert_eq!(msgs::Init {
                        features: InitFeatures::from_le_bytes(vec![]),
                }.encode(), hex::decode("00000000").unwrap());
        }

        #[test]
        fn encoding_error() {
                let error = msgs::ErrorMessage {
                        channel_id: [2; 32],
                        data: String::from("rust-lightning"),
                };
                let encoded_value = error.encode();
                let target_value = hex::decode("0202020202020202020202020202020202020202020202020202020202020202000e727573742d6c696768746e696e67").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_ping() {
                let ping = msgs::Ping {
                        ponglen: 64,
                        byteslen: 64
                };
                let encoded_value = ping.encode();
                let target_value = hex::decode("0040004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_pong() {
                let pong = msgs::Pong {
                        byteslen: 64
                };
                let encoded_value = pong.encode();
                let target_value = hex::decode("004000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_legacy_onion_hop_data() {
                let msg = msgs::OnionHopData {
                        format: OnionHopDataFormat::Legacy {
                                short_channel_id: 0xdeadbeef1bad1dea,
                        },
                        amt_to_forward: 0x0badf00d01020304,
                        outgoing_cltv_value: 0xffffffff,
                };
                let encoded_value = msg.encode();
                let target_value = hex::decode("00deadbeef1bad1dea0badf00d01020304ffffffff000000000000000000000000").unwrap();
                assert_eq!(encoded_value, target_value);
        }

        #[test]
        fn encoding_nonfinal_onion_hop_data() {
                let mut msg = msgs::OnionHopData {
                        format: OnionHopDataFormat::NonFinalNode {
                                short_channel_id: 0xdeadbeef1bad1dea,
                        },
                        amt_to_forward: 0x0badf00d01020304,
                        outgoing_cltv_value: 0xffffffff,
                };
                let encoded_value = msg.encode();
                let target_value = hex::decode("1a02080badf00d010203040404ffffffff0608deadbeef1bad1dea").unwrap();
                assert_eq!(encoded_value, target_value);
                msg = Readable::read(&mut Cursor::new(&target_value[..])).unwrap();
                if let OnionHopDataFormat::NonFinalNode { short_channel_id } = msg.format {
                        assert_eq!(short_channel_id, 0xdeadbeef1bad1dea);
                } else { panic!(); }
                assert_eq!(msg.amt_to_forward, 0x0badf00d01020304);
                assert_eq!(msg.outgoing_cltv_value, 0xffffffff);
        }

        #[test]
        fn encoding_final_onion_hop_data() {
                let mut msg = msgs::OnionHopData {
                        format: OnionHopDataFormat::FinalNode {
                                payment_data: None,
                        },
                        amt_to_forward: 0x0badf00d01020304,
                        outgoing_cltv_value: 0xffffffff,
                };
                let encoded_value = msg.encode();
                let target_value = hex::decode("1002080badf00d010203040404ffffffff").unwrap();
                assert_eq!(encoded_value, target_value);
                msg = Readable::read(&mut Cursor::new(&target_value[..])).unwrap();
                if let OnionHopDataFormat::FinalNode { payment_data: None } = msg.format { } else { panic!(); }
                assert_eq!(msg.amt_to_forward, 0x0badf00d01020304);
                assert_eq!(msg.outgoing_cltv_value, 0xffffffff);
        }

        #[test]
        fn encoding_final_onion_hop_data_with_secret() {
                let expected_payment_secret = PaymentSecret([0x42u8; 32]);
                let mut msg = msgs::OnionHopData {
                        format: OnionHopDataFormat::FinalNode {
                                payment_data: Some(FinalOnionHopData {
                                        payment_secret: expected_payment_secret,
                                        total_msat: 0x1badca1f
                                }),
                        },
                        amt_to_forward: 0x0badf00d01020304,
                        outgoing_cltv_value: 0xffffffff,
                };
                let encoded_value = msg.encode();
                let target_value = hex::decode("3602080badf00d010203040404ffffffff082442424242424242424242424242424242424242424242424242424242424242421badca1f").unwrap();
                assert_eq!(encoded_value, target_value);
                msg = Readable::read(&mut Cursor::new(&target_value[..])).unwrap();
                if let OnionHopDataFormat::FinalNode {
                        payment_data: Some(FinalOnionHopData {
                                payment_secret,
                                total_msat: 0x1badca1f
                        })
                } = msg.format {
                        assert_eq!(payment_secret, expected_payment_secret);
                } else { panic!(); }
                assert_eq!(msg.amt_to_forward, 0x0badf00d01020304);
                assert_eq!(msg.outgoing_cltv_value, 0xffffffff);
        }
}