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

   1 //! Top level peer message handling and socket handling logic lives here.
   2 //!
   3 //! Instead of actually servicing sockets ourselves we require that you implement the
   4 //! SocketDescriptor interface and use that to receive actions which you should perform on the
   5 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
   6 //! call into the provided message handlers (probably a ChannelManager and NetGraphmsgHandler) with messages
   7 //! they should handle, and encoding/sending response messages.
   8
   9 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
  10
  11 use ln::features::InitFeatures;
  12 use ln::msgs;
  13 use ln::msgs::{ChannelMessageHandler, RoutingMessageHandler};
  14 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  15 use util::ser::VecWriter;
  16 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  17 use ln::wire;
  18 use ln::wire::Encode;
  19 use util::byte_utils;
  20 use util::events::{MessageSendEvent, MessageSendEventsProvider};
  21 use util::logger::Logger;
  22 use routing::network_graph::NetGraphMsgHandler;
  23
  24 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
  25 use std::sync::{Arc, Mutex};
  26 use std::sync::atomic::{AtomicUsize, Ordering};
  27 use std::{cmp,error,hash,fmt};
  28 use std::ops::Deref;
  29
  30 use bitcoin::hashes::sha256::Hash as Sha256;
  31 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
  32 use bitcoin::hashes::{HashEngine, Hash};
  33
  34 /// Provides references to trait impls which handle different types of messages.
  35 pub struct MessageHandler<CM: Deref, RM: Deref> where
  36                 CM::Target: ChannelMessageHandler,
  37                 RM::Target: RoutingMessageHandler {
  38         /// A message handler which handles messages specific to channels. Usually this is just a
  39         /// ChannelManager object.
  40         pub chan_handler: CM,
  41         /// A message handler which handles messages updating our knowledge of the network channel
  42         /// graph. Usually this is just a NetGraphMsgHandlerMonitor object.
  43         pub route_handler: RM,
  44 }
  45
  46 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  47 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  48 /// implement Hash to meet the PeerManager API.
  49 ///
  50 /// For efficiency, Clone should be relatively cheap for this type.
  51 ///
  52 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  53 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
  54 /// be careful to ensure you don't have races whereby you might register a new connection with an
  55 /// fd which is the same as a previous one which has yet to be removed via
  56 /// PeerManager::socket_disconnected().
  57 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  58         /// Attempts to send some data from the given slice to the peer.
  59         ///
  60         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  61         /// Note that in the disconnected case, socket_disconnected must still fire and further write
  62         /// attempts may occur until that time.
  63         ///
  64         /// If the returned size is smaller than data.len(), a write_available event must
  65         /// trigger the next time more data can be written. Additionally, until the a send_data event
  66         /// completes fully, no further read_events should trigger on the same peer!
  67         ///
  68         /// If a read_event on this descriptor had previously returned true (indicating that read
  69         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  70         /// indicating that read events on this descriptor should resume. A resume_read of false does
  71         /// *not* imply that further read events should be paused.
  72         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
  73         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
  74         /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
  75         /// this descriptor. No socket_disconnected call should be generated as a result of this call,
  76         /// though races may occur whereby disconnect_socket is called after a call to
  77         /// socket_disconnected but prior to socket_disconnected returning.
  78         fn disconnect_socket(&mut self);
  79 }
  80
  81 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  82 /// generate no further read_event/write_buffer_space_avail calls for the descriptor, only
  83 /// triggering a single socket_disconnected call (unless it was provided in response to a
  84 /// new_*_connection event, in which case no such socket_disconnected() must be called and the
  85 /// socket silently disconencted).
  86 pub struct PeerHandleError {
  87         /// Used to indicate that we probably can't make any future connections to this peer, implying
  88         /// we should go ahead and force-close any channels we have with it.
  89         pub no_connection_possible: bool,
  90 }
  91 impl fmt::Debug for PeerHandleError {
  92         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  93                 formatter.write_str("Peer Sent Invalid Data")
  94         }
  95 }
  96 impl fmt::Display for PeerHandleError {
  97         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  98                 formatter.write_str("Peer Sent Invalid Data")
  99         }
 100 }
 101 impl error::Error for PeerHandleError {
 102         fn description(&self) -> &str {
 103                 "Peer Sent Invalid Data"
 104         }
 105 }
 106
 107 enum InitSyncTracker{
 108         NoSyncRequested,
 109         ChannelsSyncing(u64),
 110         NodesSyncing(PublicKey),
 111 }
 112
 113 struct Peer {
 114         channel_encryptor: PeerChannelEncryptor,
 115         outbound: bool,
 116         their_node_id: Option<PublicKey>,
 117         their_features: Option<InitFeatures>,
 118
 119         pending_outbound_buffer: LinkedList<Vec<u8>>,
 120         pending_outbound_buffer_first_msg_offset: usize,
 121         awaiting_write_event: bool,
 122
 123         pending_read_buffer: Vec<u8>,
 124         pending_read_buffer_pos: usize,
 125         pending_read_is_header: bool,
 126
 127         sync_status: InitSyncTracker,
 128
 129         awaiting_pong: bool,
 130 }
 131
 132 impl Peer {
 133         /// Returns true if the channel announcements/updates for the given channel should be
 134         /// forwarded to this peer.
 135         /// If we are sending our routing table to this peer and we have not yet sent channel
 136         /// announcements/updates for the given channel_id then we will send it when we get to that
 137         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 138         /// sent the old versions, we should send the update, and so return true here.
 139         fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
 140                 match self.sync_status {
 141                         InitSyncTracker::NoSyncRequested => true,
 142                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 143                         InitSyncTracker::NodesSyncing(_) => true,
 144                 }
 145         }
 146
 147         /// Similar to the above, but for node announcements indexed by node_id.
 148         fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
 149                 match self.sync_status {
 150                         InitSyncTracker::NoSyncRequested => true,
 151                         InitSyncTracker::ChannelsSyncing(_) => false,
 152                         InitSyncTracker::NodesSyncing(pk) => pk < node_id,
 153                 }
 154         }
 155 }
 156
 157 struct PeerHolder<Descriptor: SocketDescriptor> {
 158         peers: HashMap<Descriptor, Peer>,
 159         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 160         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 161         peers_needing_send: HashSet<Descriptor>,
 162         /// Only add to this set when noise completes:
 163         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 164 }
 165
 166 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 167 fn _check_usize_is_32_or_64() {
 168         // See below, less than 32 bit pointers may be unsafe here!
 169         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 170 }
 171
 172 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 173 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 174 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 175 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 176 /// issues such as overly long function definitions.
 177 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = Arc<PeerManager<SD, SimpleArcChannelManager<M, T, F, L>, Arc<NetGraphMsgHandler<Arc<C>, Arc<L>>>, Arc<L>>>;
 178
 179 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 180 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 181 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 182 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 183 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 184 /// helps with issues such as long function definitions.
 185 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e NetGraphMsgHandler<&'g C, &'f L>, &'f L>;
 186
 187 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 188 /// events into messages which it passes on to its MessageHandlers.
 189 ///
 190 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 191 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 192 /// essentially you should default to using a SimpleRefPeerManager, and use a
 193 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 194 /// you're using lightning-net-tokio.
 195 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> where
 196                 CM::Target: ChannelMessageHandler,
 197                 RM::Target: RoutingMessageHandler,
 198                 L::Target: Logger {
 199         message_handler: MessageHandler<CM, RM>,
 200         peers: Mutex<PeerHolder<Descriptor>>,
 201         our_node_secret: SecretKey,
 202         ephemeral_key_midstate: Sha256Engine,
 203
 204         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 205         // bits we will never realistically count into high:
 206         peer_counter_low: AtomicUsize,
 207         peer_counter_high: AtomicUsize,
 208
 209         logger: L,
 210 }
 211
 212 macro_rules! encode_msg {
 213         ($msg: expr) => {{
 214                 let mut buffer = VecWriter(Vec::new());
 215                 wire::write($msg, &mut buffer).unwrap();
 216                 buffer.0
 217         }}
 218 }
 219
 220 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 221 /// PeerIds may repeat, but only after socket_disconnected() has been called.
 222 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> PeerManager<Descriptor, CM, RM, L> where
 223                 CM::Target: ChannelMessageHandler,
 224                 RM::Target: RoutingMessageHandler,
 225                 L::Target: Logger {
 226         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 227         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 228         /// cryptographically secure random bytes.
 229         pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 230                 let mut ephemeral_key_midstate = Sha256::engine();
 231                 ephemeral_key_midstate.input(ephemeral_random_data);
 232
 233                 PeerManager {
 234                         message_handler,
 235                         peers: Mutex::new(PeerHolder {
 236                                 peers: HashMap::new(),
 237                                 peers_needing_send: HashSet::new(),
 238                                 node_id_to_descriptor: HashMap::new()
 239                         }),
 240                         our_node_secret,
 241                         ephemeral_key_midstate,
 242                         peer_counter_low: AtomicUsize::new(0),
 243                         peer_counter_high: AtomicUsize::new(0),
 244                         logger,
 245                 }
 246         }
 247
 248         /// Get the list of node ids for peers which have completed the initial handshake.
 249         ///
 250         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 251         /// new_outbound_connection, however entries will only appear once the initial handshake has
 252         /// completed and we are sure the remote peer has the private key for the given node_id.
 253         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 254                 let peers = self.peers.lock().unwrap();
 255                 peers.peers.values().filter_map(|p| {
 256                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 257                                 return None;
 258                         }
 259                         p.their_node_id
 260                 }).collect()
 261         }
 262
 263         fn get_ephemeral_key(&self) -> SecretKey {
 264                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 265                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 266                 let high = if low == 0 {
 267                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 268                 } else {
 269                         self.peer_counter_high.load(Ordering::Acquire)
 270                 };
 271                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 272                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 273                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 274         }
 275
 276         /// Indicates a new outbound connection has been established to a node with the given node_id.
 277         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 278         /// descriptor but must disconnect the connection immediately.
 279         ///
 280         /// Returns a small number of bytes to send to the remote node (currently always 50).
 281         ///
 282         /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
 283         /// socket_disconnected().
 284         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 285                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 286                 let res = peer_encryptor.get_act_one().to_vec();
 287                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 288
 289                 let mut peers = self.peers.lock().unwrap();
 290                 if peers.peers.insert(descriptor, Peer {
 291                         channel_encryptor: peer_encryptor,
 292                         outbound: true,
 293                         their_node_id: None,
 294                         their_features: None,
 295
 296                         pending_outbound_buffer: LinkedList::new(),
 297                         pending_outbound_buffer_first_msg_offset: 0,
 298                         awaiting_write_event: false,
 299
 300                         pending_read_buffer: pending_read_buffer,
 301                         pending_read_buffer_pos: 0,
 302                         pending_read_is_header: false,
 303
 304                         sync_status: InitSyncTracker::NoSyncRequested,
 305
 306                         awaiting_pong: false,
 307                 }).is_some() {
 308                         panic!("PeerManager driver duplicated descriptors!");
 309                 };
 310                 Ok(res)
 311         }
 312
 313         /// Indicates a new inbound connection has been established.
 314         ///
 315         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 316         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 317         /// call socket_disconnected for the new descriptor but must disconnect the connection
 318         /// immediately.
 319         ///
 320         /// Panics if descriptor is duplicative with some other descriptor which has not yet had
 321         /// socket_disconnected called.
 322         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 323                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 324                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 325
 326                 let mut peers = self.peers.lock().unwrap();
 327                 if peers.peers.insert(descriptor, Peer {
 328                         channel_encryptor: peer_encryptor,
 329                         outbound: false,
 330                         their_node_id: None,
 331                         their_features: None,
 332
 333                         pending_outbound_buffer: LinkedList::new(),
 334                         pending_outbound_buffer_first_msg_offset: 0,
 335                         awaiting_write_event: false,
 336
 337                         pending_read_buffer: pending_read_buffer,
 338                         pending_read_buffer_pos: 0,
 339                         pending_read_is_header: false,
 340
 341                         sync_status: InitSyncTracker::NoSyncRequested,
 342
 343                         awaiting_pong: false,
 344                 }).is_some() {
 345                         panic!("PeerManager driver duplicated descriptors!");
 346                 };
 347                 Ok(())
 348         }
 349
 350         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 351                 macro_rules! encode_and_send_msg {
 352                         ($msg: expr) => {
 353                                 {
 354                                         log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 355                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
 356                                 }
 357                         }
 358                 }
 359                 const MSG_BUFF_SIZE: usize = 10;
 360                 while !peer.awaiting_write_event {
 361                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 362                                 match peer.sync_status {
 363                                         InitSyncTracker::NoSyncRequested => {},
 364                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 365                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 366                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
 367                                                 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
 368                                                         encode_and_send_msg!(announce);
 369                                                         if let &Some(ref update_a) = update_a_option {
 370                                                                 encode_and_send_msg!(update_a);
 371                                                         }
 372                                                         if let &Some(ref update_b) = update_b_option {
 373                                                                 encode_and_send_msg!(update_b);
 374                                                         }
 375                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 376                                                 }
 377                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 378                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 379                                                 }
 380                                         },
 381                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 382                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 383                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 384                                                 for msg in all_messages.iter() {
 385                                                         encode_and_send_msg!(msg);
 386                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 387                                                 }
 388                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 389                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 390                                                 }
 391                                         },
 392                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 393                                         InitSyncTracker::NodesSyncing(key) => {
 394                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 395                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 396                                                 for msg in all_messages.iter() {
 397                                                         encode_and_send_msg!(msg);
 398                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 399                                                 }
 400                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 401                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 402                                                 }
 403                                         },
 404                                 }
 405                         }
 406
 407                         if {
 408                                 let next_buff = match peer.pending_outbound_buffer.front() {
 409                                         None => return,
 410                                         Some(buff) => buff,
 411                                 };
 412
 413                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 414                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 415                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 416                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 417                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 418                         } {
 419                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 420                                 peer.pending_outbound_buffer.pop_front();
 421                         } else {
 422                                 peer.awaiting_write_event = true;
 423                         }
 424                 }
 425         }
 426
 427         /// Indicates that there is room to write data to the given socket descriptor.
 428         ///
 429         /// May return an Err to indicate that the connection should be closed.
 430         ///
 431         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 432         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 433         /// invariants around calling write_buffer_space_avail in case a write did not fully complete
 434         /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
 435         /// here isn't sufficient! Panics if the descriptor was not previously registered in a
 436         /// new_\*_connection event.
 437         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 438                 let mut peers = self.peers.lock().unwrap();
 439                 match peers.peers.get_mut(descriptor) {
 440                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 441                         Some(peer) => {
 442                                 peer.awaiting_write_event = false;
 443                                 self.do_attempt_write_data(descriptor, peer);
 444                         }
 445                 };
 446                 Ok(())
 447         }
 448
 449         /// Indicates that data was read from the given socket descriptor.
 450         ///
 451         /// May return an Err to indicate that the connection should be closed.
 452         ///
 453         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 454         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 455         /// generate send_data calls to handle responses.
 456         ///
 457         /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
 458         /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 459         ///
 460         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 461         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 462                 match self.do_read_event(peer_descriptor, data) {
 463                         Ok(res) => Ok(res),
 464                         Err(e) => {
 465                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 466                                 Err(e)
 467                         }
 468                 }
 469         }
 470
 471         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 472                 let pause_read = {
 473                         let mut peers_lock = self.peers.lock().unwrap();
 474                         let peers = &mut *peers_lock;
 475                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 476                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 477                                 Some(peer) => {
 478                                         assert!(peer.pending_read_buffer.len() > 0);
 479                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 480
 481                                         let mut read_pos = 0;
 482                                         while read_pos < data.len() {
 483                                                 {
 484                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 485                                                         peer.pending_read_buffer[peer.pending_read_buffer_pos..peer.pending_read_buffer_pos + data_to_copy].copy_from_slice(&data[read_pos..read_pos + data_to_copy]);
 486                                                         read_pos += data_to_copy;
 487                                                         peer.pending_read_buffer_pos += data_to_copy;
 488                                                 }
 489
 490                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 491                                                         peer.pending_read_buffer_pos = 0;
 492
 493                                                         macro_rules! encode_and_send_msg {
 494                                                                 ($msg: expr) => {
 495                                                                         {
 496                                                                                 log_trace!(self.logger, "Encoding and sending message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 497                                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&$msg)[..]));
 498                                                                                 peers.peers_needing_send.insert(peer_descriptor.clone());
 499                                                                         }
 500                                                                 }
 501                                                         }
 502
 503                                                         macro_rules! try_potential_handleerror {
 504                                                                 ($thing: expr) => {
 505                                                                         match $thing {
 506                                                                                 Ok(x) => x,
 507                                                                                 Err(e) => {
 508                                                                                         match e.action {
 509                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 510                                                                                                         //TODO: Try to push msg
 511                                                                                                         log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
 512                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 513                                                                                                 },
 514                                                                                                 msgs::ErrorAction::IgnoreError => {
 515                                                                                                         log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
 516                                                                                                         continue;
 517                                                                                                 },
 518                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 519                                                                                                         log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
 520                                                                                                         encode_and_send_msg!(msg);
 521                                                                                                         continue;
 522                                                                                                 },
 523                                                                                         }
 524                                                                                 }
 525                                                                         };
 526                                                                 }
 527                                                         }
 528
 529                                                         macro_rules! insert_node_id {
 530                                                                 () => {
 531                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 532                                                                                 hash_map::Entry::Occupied(_) => {
 533                                                                                         log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 534                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 535                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 536                                                                                 },
 537                                                                                 hash_map::Entry::Vacant(entry) => {
 538                                                                                         log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 539                                                                                         entry.insert(peer_descriptor.clone())
 540                                                                                 },
 541                                                                         };
 542                                                                 }
 543                                                         }
 544
 545                                                         let next_step = peer.channel_encryptor.get_noise_step();
 546                                                         match next_step {
 547                                                                 NextNoiseStep::ActOne => {
 548                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
 549                                                                         peer.pending_outbound_buffer.push_back(act_two);
 550                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 551                                                                 },
 552                                                                 NextNoiseStep::ActTwo => {
 553                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 554                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 555                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 556                                                                         peer.pending_read_is_header = true;
 557
 558                                                                         peer.their_node_id = Some(their_node_id);
 559                                                                         insert_node_id!();
 560                                                                         let mut features = InitFeatures::known();
 561                                                                         if !self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
 562                                                                                 features.clear_initial_routing_sync();
 563                                                                         }
 564
 565                                                                         let resp = msgs::Init { features };
 566                                                                         encode_and_send_msg!(resp);
 567                                                                 },
 568                                                                 NextNoiseStep::ActThree => {
 569                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 570                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 571                                                                         peer.pending_read_is_header = true;
 572                                                                         peer.their_node_id = Some(their_node_id);
 573                                                                         insert_node_id!();
 574                                                                 },
 575                                                                 NextNoiseStep::NoiseComplete => {
 576                                                                         if peer.pending_read_is_header {
 577                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 578                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 579                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 580                                                                                 if msg_len < 2 { // Need at least the message type tag
 581                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 582                                                                                 }
 583                                                                                 peer.pending_read_is_header = false;
 584                                                                         } else {
 585                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 586                                                                                 assert!(msg_data.len() >= 2);
 587
 588                                                                                 // Reset read buffer
 589                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 590                                                                                 peer.pending_read_is_header = true;
 591
 592                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
 593                                                                                 let message_result = wire::read(&mut reader);
 594                                                                                 let message = match message_result {
 595                                                                                         Ok(x) => x,
 596                                                                                         Err(e) => {
 597                                                                                                 match e {
 598                                                                                                         msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
 599                                                                                                         msgs::DecodeError::UnknownRequiredFeature => {
 600                                                                                                                 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 601                                                                                                                 continue;
 602                                                                                                         }
 603                                                                                                         msgs::DecodeError::InvalidValue => {
 604                                                                                                                 log_debug!(self.logger, "Got an invalid value while deserializing message");
 605                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 606                                                                                                         }
 607                                                                                                         msgs::DecodeError::ShortRead => {
 608                                                                                                                 log_debug!(self.logger, "Deserialization failed due to shortness of message");
 609                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 610                                                                                                         }
 611                                                                                                         msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
 612                                                                                                         msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
 613                                                                                                 }
 614                                                                                         }
 615                                                                                 };
 616
 617                                                                                 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 618
 619                                                                                 // Need an Init as first message
 620                                                                                 if let wire::Message::Init(_) = message {
 621                                                                                 } else if peer.their_features.is_none() {
 622                                                                                         log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 623                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 624                                                                                 }
 625
 626                                                                                 match message {
 627                                                                                         // Setup and Control messages:
 628                                                                                         wire::Message::Init(msg) => {
 629                                                                                                 if msg.features.requires_unknown_bits() {
 630                                                                                                         log_info!(self.logger, "Peer global features required unknown version bits");
 631                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 632                                                                                                 }
 633                                                                                                 if msg.features.requires_unknown_bits() {
 634                                                                                                         log_info!(self.logger, "Peer local features required unknown version bits");
 635                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 636                                                                                                 }
 637                                                                                                 if peer.their_features.is_some() {
 638                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 639                                                                                                 }
 640
 641                                                                                                 log_info!(self.logger, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, static_remote_key: {}, unkown local flags: {}, unknown global flags: {}",
 642                                                                                                         if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
 643                                                                                                         if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
 644                                                                                                         if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 645                                                                                                         if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
 646                                                                                                         if msg.features.supports_unknown_bits() { "present" } else { "none" },
 647                                                                                                         if msg.features.supports_unknown_bits() { "present" } else { "none" });
 648
 649                                                                                                 if msg.features.initial_routing_sync() {
 650                                                                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 651                                                                                                         peers.peers_needing_send.insert(peer_descriptor.clone());
 652                                                                                                 }
 653                                                                                                 if !msg.features.supports_static_remote_key() {
 654                                                                                                         log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
 655                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 656                                                                                                 }
 657
 658                                                                                                 if !peer.outbound {
 659                                                                                                         let mut features = InitFeatures::known();
 660                                                                                                         if !self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
 661                                                                                                                 features.clear_initial_routing_sync();
 662                                                                                                         }
 663
 664                                                                                                         let resp = msgs::Init { features };
 665                                                                                                         encode_and_send_msg!(resp);
 666                                                                                                 }
 667
 668                                                                                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
 669                                                                                                 peer.their_features = Some(msg.features);
 670                                                                                         },
 671                                                                                         wire::Message::Error(msg) => {
 672                                                                                                 let mut data_is_printable = true;
 673                                                                                                 for b in msg.data.bytes() {
 674                                                                                                         if b < 32 || b > 126 {
 675                                                                                                                 data_is_printable = false;
 676                                                                                                                 break;
 677                                                                                                         }
 678                                                                                                 }
 679
 680                                                                                                 if data_is_printable {
 681                                                                                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 682                                                                                                 } else {
 683                                                                                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 684                                                                                                 }
 685                                                                                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 686                                                                                                 if msg.channel_id == [0; 32] {
 687                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 688                                                                                                 }
 689                                                                                         },
 690
 691                                                                                         wire::Message::Ping(msg) => {
 692                                                                                                 if msg.ponglen < 65532 {
 693                                                                                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 694                                                                                                         encode_and_send_msg!(resp);
 695                                                                                                 }
 696                                                                                         },
 697                                                                                         wire::Message::Pong(_msg) => {
 698                                                                                                 peer.awaiting_pong = false;
 699                                                                                         },
 700
 701                                                                                         // Channel messages:
 702                                                                                         wire::Message::OpenChannel(msg) => {
 703                                                                                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 704                                                                                         },
 705                                                                                         wire::Message::AcceptChannel(msg) => {
 706                                                                                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 707                                                                                         },
 708
 709                                                                                         wire::Message::FundingCreated(msg) => {
 710                                                                                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
 711                                                                                         },
 712                                                                                         wire::Message::FundingSigned(msg) => {
 713                                                                                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
 714                                                                                         },
 715                                                                                         wire::Message::FundingLocked(msg) => {
 716                                                                                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
 717                                                                                         },
 718
 719                                                                                         wire::Message::Shutdown(msg) => {
 720                                                                                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg);
 721                                                                                         },
 722                                                                                         wire::Message::ClosingSigned(msg) => {
 723                                                                                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
 724                                                                                         },
 725
 726                                                                                         // Commitment messages:
 727                                                                                         wire::Message::UpdateAddHTLC(msg) => {
 728                                                                                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
 729                                                                                         },
 730                                                                                         wire::Message::UpdateFulfillHTLC(msg) => {
 731                                                                                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
 732                                                                                         },
 733                                                                                         wire::Message::UpdateFailHTLC(msg) => {
 734                                                                                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
 735                                                                                         },
 736                                                                                         wire::Message::UpdateFailMalformedHTLC(msg) => {
 737                                                                                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
 738                                                                                         },
 739
 740                                                                                         wire::Message::CommitmentSigned(msg) => {
 741                                                                                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
 742                                                                                         },
 743                                                                                         wire::Message::RevokeAndACK(msg) => {
 744                                                                                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
 745                                                                                         },
 746                                                                                         wire::Message::UpdateFee(msg) => {
 747                                                                                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
 748                                                                                         },
 749                                                                                         wire::Message::ChannelReestablish(msg) => {
 750                                                                                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
 751                                                                                         },
 752
 753                                                                                         // Routing messages:
 754                                                                                         wire::Message::AnnouncementSignatures(msg) => {
 755                                                                                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
 756                                                                                         },
 757                                                                                         wire::Message::ChannelAnnouncement(msg) => {
 758                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
 759
 760                                                                                                 if should_forward {
 761                                                                                                         // TODO: forward msg along to all our other peers!
 762                                                                                                 }
 763                                                                                         },
 764                                                                                         wire::Message::NodeAnnouncement(msg) => {
 765                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
 766
 767                                                                                                 if should_forward {
 768                                                                                                         // TODO: forward msg along to all our other peers!
 769                                                                                                 }
 770                                                                                         },
 771                                                                                         wire::Message::ChannelUpdate(msg) => {
 772                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
 773
 774                                                                                                 if should_forward {
 775                                                                                                         // TODO: forward msg along to all our other peers!
 776                                                                                                 }
 777                                                                                         },
 778
 779                                                                                         // Unknown messages:
 780                                                                                         wire::Message::Unknown(msg_type) if msg_type.is_even() => {
 781                                                                                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
 782                                                                                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
 783                                                                                                 return Err(PeerHandleError{ no_connection_possible: true });
 784                                                                                         },
 785                                                                                         wire::Message::Unknown(msg_type) => {
 786                                                                                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
 787                                                                                         },
 788                                                                                 }
 789                                                                         }
 790                                                                 }
 791                                                         }
 792                                                 }
 793                                         }
 794
 795                                         self.do_attempt_write_data(peer_descriptor, peer);
 796
 797                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 798                                 }
 799                         };
 800
 801                         pause_read
 802                 };
 803
 804                 Ok(pause_read)
 805         }
 806
 807         /// Checks for any events generated by our handlers and processes them. Includes sending most
 808         /// response messages as well as messages generated by calls to handler functions directly (eg
 809         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
 810         pub fn process_events(&self) {
 811                 {
 812                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 813                         // buffer by doing things like announcing channels on another node. We should be willing to
 814                         // drop optional-ish messages when send buffers get full!
 815
 816                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
 817                         let mut peers_lock = self.peers.lock().unwrap();
 818                         let peers = &mut *peers_lock;
 819                         for event in events_generated.drain(..) {
 820                                 macro_rules! get_peer_for_forwarding {
 821                                         ($node_id: expr, $handle_no_such_peer: block) => {
 822                                                 {
 823                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 824                                                                 Some(descriptor) => descriptor.clone(),
 825                                                                 None => {
 826                                                                         $handle_no_such_peer;
 827                                                                         continue;
 828                                                                 },
 829                                                         };
 830                                                         match peers.peers.get_mut(&descriptor) {
 831                                                                 Some(peer) => {
 832                                                                         if peer.their_features.is_none() {
 833                                                                                 $handle_no_such_peer;
 834                                                                                 continue;
 835                                                                         }
 836                                                                         (descriptor, peer)
 837                                                                 },
 838                                                                 None => panic!("Inconsistent peers set state!"),
 839                                                         }
 840                                                 }
 841                                         }
 842                                 }
 843                                 match event {
 844                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
 845                                                 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
 846                                                                 log_pubkey!(node_id),
 847                                                                 log_bytes!(msg.temporary_channel_id));
 848                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 849                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 850                                                         });
 851                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 852                                                 self.do_attempt_write_data(&mut descriptor, peer);
 853                                         },
 854                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
 855                                                 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
 856                                                                 log_pubkey!(node_id),
 857                                                                 log_bytes!(msg.temporary_channel_id));
 858                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 859                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 860                                                         });
 861                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 862                                                 self.do_attempt_write_data(&mut descriptor, peer);
 863                                         },
 864                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
 865                                                 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
 866                                                                 log_pubkey!(node_id),
 867                                                                 log_bytes!(msg.temporary_channel_id),
 868                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
 869                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 870                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 871                                                                 //they should just throw away this funding transaction
 872                                                         });
 873                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 874                                                 self.do_attempt_write_data(&mut descriptor, peer);
 875                                         },
 876                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
 877                                                 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
 878                                                                 log_pubkey!(node_id),
 879                                                                 log_bytes!(msg.channel_id));
 880                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 881                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 882                                                                 //they should just throw away this funding transaction
 883                                                         });
 884                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 885                                                 self.do_attempt_write_data(&mut descriptor, peer);
 886                                         },
 887                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
 888                                                 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
 889                                                                 log_pubkey!(node_id),
 890                                                                 log_bytes!(msg.channel_id));
 891                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 892                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 893                                                         });
 894                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 895                                                 self.do_attempt_write_data(&mut descriptor, peer);
 896                                         },
 897                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
 898                                                 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
 899                                                                 log_pubkey!(node_id),
 900                                                                 log_bytes!(msg.channel_id));
 901                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 902                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 903                                                                 //they should just throw away this funding transaction
 904                                                         });
 905                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 906                                                 self.do_attempt_write_data(&mut descriptor, peer);
 907                                         },
 908                                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
 909                                                 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
 910                                                                 log_pubkey!(node_id),
 911                                                                 update_add_htlcs.len(),
 912                                                                 update_fulfill_htlcs.len(),
 913                                                                 update_fail_htlcs.len(),
 914                                                                 log_bytes!(commitment_signed.channel_id));
 915                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 916                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 917                                                         });
 918                                                 for msg in update_add_htlcs {
 919                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 920                                                 }
 921                                                 for msg in update_fulfill_htlcs {
 922                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 923                                                 }
 924                                                 for msg in update_fail_htlcs {
 925                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 926                                                 }
 927                                                 for msg in update_fail_malformed_htlcs {
 928                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 929                                                 }
 930                                                 if let &Some(ref msg) = update_fee {
 931                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 932                                                 }
 933                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
 934                                                 self.do_attempt_write_data(&mut descriptor, peer);
 935                                         },
 936                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 937                                                 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
 938                                                                 log_pubkey!(node_id),
 939                                                                 log_bytes!(msg.channel_id));
 940                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 941                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 942                                                         });
 943                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 944                                                 self.do_attempt_write_data(&mut descriptor, peer);
 945                                         },
 946                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
 947                                                 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
 948                                                                 log_pubkey!(node_id),
 949                                                                 log_bytes!(msg.channel_id));
 950                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 951                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 952                                                         });
 953                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 954                                                 self.do_attempt_write_data(&mut descriptor, peer);
 955                                         },
 956                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
 957                                                 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
 958                                                                 log_pubkey!(node_id),
 959                                                                 log_bytes!(msg.channel_id));
 960                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 961                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 962                                                         });
 963                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 964                                                 self.do_attempt_write_data(&mut descriptor, peer);
 965                                         },
 966                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 967                                                 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
 968                                                                 log_pubkey!(node_id),
 969                                                                 log_bytes!(msg.channel_id));
 970                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 971                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 972                                                         });
 973                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 974                                                 self.do_attempt_write_data(&mut descriptor, peer);
 975                                         },
 976                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
 977                                                 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 978                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
 979                                                         let encoded_msg = encode_msg!(msg);
 980                                                         let encoded_update_msg = encode_msg!(update_msg);
 981
 982                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 983                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
 984                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
 985                                                                         continue
 986                                                                 }
 987                                                                 match peer.their_node_id {
 988                                                                         None => continue,
 989                                                                         Some(their_node_id) => {
 990                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
 991                                                                                         continue
 992                                                                                 }
 993                                                                         }
 994                                                                 }
 995                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 996                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
 997                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
 998                                                         }
 999                                                 }
1000                                         },
1001                                         MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
1002                                                 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1003                                                 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
1004                                                         let encoded_msg = encode_msg!(msg);
1005
1006                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1007                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1008                                                                                 !peer.should_forward_node_announcement(msg.contents.node_id) {
1009                                                                         continue
1010                                                                 }
1011                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1012                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1013                                                         }
1014                                                 }
1015                                         },
1016                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1017                                                 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1018                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1019                                                         let encoded_msg = encode_msg!(msg);
1020
1021                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1022                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1023                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1024                                                                         continue
1025                                                                 }
1026                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1027                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1028                                                         }
1029                                                 }
1030                                         },
1031                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1032                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1033                                         },
1034                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1035                                                 match *action {
1036                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1037                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1038                                                                         peers.peers_needing_send.remove(&descriptor);
1039                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
1040                                                                                 if let Some(ref msg) = *msg {
1041                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1042                                                                                                         log_pubkey!(node_id),
1043                                                                                                         msg.data);
1044                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1045                                                                                         // This isn't guaranteed to work, but if there is enough free
1046                                                                                         // room in the send buffer, put the error message there...
1047                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1048                                                                                 } else {
1049                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1050                                                                                 }
1051                                                                         }
1052                                                                         descriptor.disconnect_socket();
1053                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1054                                                                 }
1055                                                         },
1056                                                         msgs::ErrorAction::IgnoreError => {},
1057                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1058                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1059                                                                                 log_pubkey!(node_id),
1060                                                                                 msg.data);
1061                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1062                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1063                                                                 });
1064                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1065                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1066                                                         },
1067                                                 }
1068                                         }
1069                                 }
1070                         }
1071
1072                         for mut descriptor in peers.peers_needing_send.drain() {
1073                                 match peers.peers.get_mut(&descriptor) {
1074                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1075                                         None => panic!("Inconsistent peers set state!"),
1076                                 }
1077                         }
1078                 }
1079         }
1080
1081         /// Indicates that the given socket descriptor's connection is now closed.
1082         ///
1083         /// This must only be called if the socket has been disconnected by the peer or your own
1084         /// decision to disconnect it and must NOT be called in any case where other parts of this
1085         /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1086         /// the peer.
1087         ///
1088         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1089         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1090                 self.disconnect_event_internal(descriptor, false);
1091         }
1092
1093         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1094                 let mut peers = self.peers.lock().unwrap();
1095                 peers.peers_needing_send.remove(descriptor);
1096                 let peer_option = peers.peers.remove(descriptor);
1097                 match peer_option {
1098                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1099                         Some(peer) => {
1100                                 match peer.their_node_id {
1101                                         Some(node_id) => {
1102                                                 peers.node_id_to_descriptor.remove(&node_id);
1103                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1104                                         },
1105                                         None => {}
1106                                 }
1107                         }
1108                 };
1109         }
1110
1111         /// This function should be called roughly once every 30 seconds.
1112         /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1113
1114         /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1115         pub fn timer_tick_occured(&self) {
1116                 let mut peers_lock = self.peers.lock().unwrap();
1117                 {
1118                         let peers = &mut *peers_lock;
1119                         let peers_needing_send = &mut peers.peers_needing_send;
1120                         let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1121                         let peers = &mut peers.peers;
1122                         let mut descriptors_needing_disconnect = Vec::new();
1123
1124                         peers.retain(|descriptor, peer| {
1125                                 if peer.awaiting_pong {
1126                                         peers_needing_send.remove(descriptor);
1127                                         descriptors_needing_disconnect.push(descriptor.clone());
1128                                         match peer.their_node_id {
1129                                                 Some(node_id) => {
1130                                                         log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1131                                                         node_id_to_descriptor.remove(&node_id);
1132                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1133                                                 }
1134                                                 None => {
1135                                                         // This can't actually happen as we should have hit
1136                                                         // is_ready_for_encryption() previously on this same peer.
1137                                                         unreachable!();
1138                                                 },
1139                                         }
1140                                         return false;
1141                                 }
1142
1143                                 if !peer.channel_encryptor.is_ready_for_encryption() {
1144                                         // The peer needs to complete its handshake before we can exchange messages
1145                                         return true;
1146                                 }
1147
1148                                 let ping = msgs::Ping {
1149                                         ponglen: 0,
1150                                         byteslen: 64,
1151                                 };
1152                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1153
1154                                 let mut descriptor_clone = descriptor.clone();
1155                                 self.do_attempt_write_data(&mut descriptor_clone, peer);
1156
1157                                 peer.awaiting_pong = true;
1158                                 true
1159                         });
1160
1161                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1162                                 descriptor.disconnect_socket();
1163                         }
1164                 }
1165         }
1166 }
1167
1168 #[cfg(test)]
1169 mod tests {
1170         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1171         use ln::msgs;
1172         use util::events;
1173         use util::test_utils;
1174
1175         use bitcoin::secp256k1::Secp256k1;
1176         use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1177
1178         use rand::{thread_rng, Rng};
1179
1180         use std;
1181         use std::sync::{Arc, Mutex};
1182         use std::sync::atomic::Ordering;
1183
1184         #[derive(Clone)]
1185         struct FileDescriptor {
1186                 fd: u16,
1187                 outbound_data: Arc<Mutex<Vec<u8>>>,
1188         }
1189         impl PartialEq for FileDescriptor {
1190                 fn eq(&self, other: &Self) -> bool {
1191                         self.fd == other.fd
1192                 }
1193         }
1194         impl Eq for FileDescriptor { }
1195         impl std::hash::Hash for FileDescriptor {
1196                 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1197                         self.fd.hash(hasher)
1198                 }
1199         }
1200
1201         impl SocketDescriptor for FileDescriptor {
1202                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1203                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1204                         data.len()
1205                 }
1206
1207                 fn disconnect_socket(&mut self) {}
1208         }
1209
1210         struct PeerManagerCfg {
1211                 chan_handler: test_utils::TestChannelMessageHandler,
1212                 routing_handler: test_utils::TestRoutingMessageHandler,
1213                 logger: test_utils::TestLogger,
1214         }
1215
1216         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1217                 let mut cfgs = Vec::new();
1218                 for _ in 0..peer_count {
1219                         cfgs.push(
1220                                 PeerManagerCfg{
1221                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
1222                                         logger: test_utils::TestLogger::new(),
1223                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
1224                                 }
1225                         );
1226                 }
1227
1228                 cfgs
1229         }
1230
1231         fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>> {
1232                 let mut peers = Vec::new();
1233                 let mut rng = thread_rng();
1234                 let mut ephemeral_bytes = [0; 32];
1235                 rng.fill_bytes(&mut ephemeral_bytes);
1236
1237                 for i in 0..peer_count {
1238                         let node_id = {
1239                                 let mut key_slice = [0;32];
1240                                 rng.fill_bytes(&mut key_slice);
1241                                 SecretKey::from_slice(&key_slice).unwrap()
1242                         };
1243                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1244                         let peer = PeerManager::new(msg_handler, node_id, &ephemeral_bytes, &cfgs[i].logger);
1245                         peers.push(peer);
1246                 }
1247
1248                 peers
1249         }
1250
1251         fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1252                 let secp_ctx = Secp256k1::new();
1253                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1254                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1255                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1256                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1257                 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1258                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1259                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1260                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1261                 (fd_a.clone(), fd_b.clone())
1262         }
1263
1264         fn establish_connection_and_read_events<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1265                 let (mut fd_a, mut fd_b) = establish_connection(peer_a, peer_b);
1266                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1267                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1268                 (fd_a.clone(), fd_b.clone())
1269         }
1270
1271         #[test]
1272         fn test_disconnect_peer() {
1273                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1274                 // push a DisconnectPeer event to remove the node flagged by id
1275                 let cfgs = create_peermgr_cfgs(2);
1276                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1277                 let mut peers = create_network(2, &cfgs);
1278                 establish_connection(&peers[0], &peers[1]);
1279                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1280
1281                 let secp_ctx = Secp256k1::new();
1282                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1283
1284                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1285                         node_id: their_id,
1286                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1287                 });
1288                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1289                 peers[0].message_handler.chan_handler = &chan_handler;
1290
1291                 peers[0].process_events();
1292                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1293         }
1294
1295         #[test]
1296         fn test_timer_tick_occurred() {
1297                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1298                 let cfgs = create_peermgr_cfgs(2);
1299                 let peers = create_network(2, &cfgs);
1300                 establish_connection(&peers[0], &peers[1]);
1301                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1302
1303                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1304                 peers[0].timer_tick_occured();
1305                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1306
1307                 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1308                 peers[0].timer_tick_occured();
1309                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1310         }
1311
1312         #[test]
1313         fn test_do_attempt_write_data() {
1314                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1315                 let cfgs = create_peermgr_cfgs(2);
1316                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1317                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1318                 let peers = create_network(2, &cfgs);
1319
1320                 // By calling establish_connect, we trigger do_attempt_write_data between
1321                 // the peers. Previously this function would mistakenly enter an infinite loop
1322                 // when there were more channel messages available than could fit into a peer's
1323                 // buffer. This issue would now be detected by this test (because we use custom
1324                 // RoutingMessageHandlers that intentionally return more channel messages
1325                 // than can fit into a peer's buffer).
1326                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1327
1328                 // Make each peer to read the messages that the other peer just wrote to them.
1329                 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1330                 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1331
1332                 // Check that each peer has received the expected number of channel updates and channel
1333                 // announcements.
1334                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1335                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1336                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1337                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1338         }
1339
1340         #[test]
1341         fn limit_initial_routing_sync_requests() {
1342                 // Inbound peer 0 requests initial_routing_sync, but outbound peer 1 does not.
1343                 {
1344                         let cfgs = create_peermgr_cfgs(2);
1345                         cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1346                         let peers = create_network(2, &cfgs);
1347                         let (fd_0_to_1, fd_1_to_0) = establish_connection_and_read_events(&peers[0], &peers[1]);
1348
1349                         let peer_0 = peers[0].peers.lock().unwrap();
1350                         let peer_1 = peers[1].peers.lock().unwrap();
1351
1352                         let peer_0_features = peer_1.peers.get(&fd_1_to_0).unwrap().their_features.as_ref();
1353                         let peer_1_features = peer_0.peers.get(&fd_0_to_1).unwrap().their_features.as_ref();
1354
1355                         assert!(peer_0_features.unwrap().initial_routing_sync());
1356                         assert!(!peer_1_features.unwrap().initial_routing_sync());
1357                 }
1358
1359                 // Outbound peer 1 requests initial_routing_sync, but inbound peer 0 does not.
1360                 {
1361                         let cfgs = create_peermgr_cfgs(2);
1362                         cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1363                         let peers = create_network(2, &cfgs);
1364                         let (fd_0_to_1, fd_1_to_0) = establish_connection_and_read_events(&peers[0], &peers[1]);
1365
1366                         let peer_0 = peers[0].peers.lock().unwrap();
1367                         let peer_1 = peers[1].peers.lock().unwrap();
1368
1369                         let peer_0_features = peer_1.peers.get(&fd_1_to_0).unwrap().their_features.as_ref();
1370                         let peer_1_features = peer_0.peers.get(&fd_0_to_1).unwrap().their_features.as_ref();
1371
1372                         assert!(!peer_0_features.unwrap().initial_routing_sync());
1373                         assert!(peer_1_features.unwrap().initial_routing_sync());
1374                 }
1375         }
1376 }