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

   1 // This file is Copyright its original authors, visible in version control
   2 // history.
   3 //
   4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
   5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
   6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
   7 // You may not use this file except in accordance with one or both of these
   8 // licenses.
   9
  10 //! Top level peer message handling and socket handling logic lives here.
  11 //!
  12 //! Instead of actually servicing sockets ourselves we require that you implement the
  13 //! SocketDescriptor interface and use that to receive actions which you should perform on the
  14 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
  15 //! call into the provided message handlers (probably a ChannelManager and NetGraphmsgHandler) with messages
  16 //! they should handle, and encoding/sending response messages.
  17
  18 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
  19
  20 use ln::features::InitFeatures;
  21 use ln::msgs;
  22 use ln::msgs::{ChannelMessageHandler, LightningError, RoutingMessageHandler};
  23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
  24 use util::ser::{VecWriter, Writeable};
  25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  26 use ln::wire;
  27 use ln::wire::Encode;
  28 use util::byte_utils;
  29 use util::events::{MessageSendEvent, MessageSendEventsProvider};
  30 use util::logger::Logger;
  31 use routing::network_graph::NetGraphMsgHandler;
  32
  33 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
  34 use std::sync::{Arc, Mutex};
  35 use std::sync::atomic::{AtomicUsize, Ordering};
  36 use std::{cmp,error,hash,fmt};
  37 use std::ops::Deref;
  38
  39 use bitcoin::hashes::sha256::Hash as Sha256;
  40 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
  41 use bitcoin::hashes::{HashEngine, Hash};
  42
  43 /// Provides references to trait impls which handle different types of messages.
  44 pub struct MessageHandler<CM: Deref, RM: Deref> where
  45                 CM::Target: ChannelMessageHandler,
  46                 RM::Target: RoutingMessageHandler {
  47         /// A message handler which handles messages specific to channels. Usually this is just a
  48         /// ChannelManager object.
  49         pub chan_handler: CM,
  50         /// A message handler which handles messages updating our knowledge of the network channel
  51         /// graph. Usually this is just a NetGraphMsgHandlerMonitor object.
  52         pub route_handler: RM,
  53 }
  54
  55 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  56 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  57 /// implement Hash to meet the PeerManager API.
  58 ///
  59 /// For efficiency, Clone should be relatively cheap for this type.
  60 ///
  61 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  62 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
  63 /// be careful to ensure you don't have races whereby you might register a new connection with an
  64 /// fd which is the same as a previous one which has yet to be removed via
  65 /// PeerManager::socket_disconnected().
  66 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  67         /// Attempts to send some data from the given slice to the peer.
  68         ///
  69         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  70         /// Note that in the disconnected case, socket_disconnected must still fire and further write
  71         /// attempts may occur until that time.
  72         ///
  73         /// If the returned size is smaller than data.len(), a write_available event must
  74         /// trigger the next time more data can be written. Additionally, until the a send_data event
  75         /// completes fully, no further read_events should trigger on the same peer!
  76         ///
  77         /// If a read_event on this descriptor had previously returned true (indicating that read
  78         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  79         /// indicating that read events on this descriptor should resume. A resume_read of false does
  80         /// *not* imply that further read events should be paused.
  81         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
  82         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
  83         /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
  84         /// this descriptor. No socket_disconnected call should be generated as a result of this call,
  85         /// though races may occur whereby disconnect_socket is called after a call to
  86         /// socket_disconnected but prior to socket_disconnected returning.
  87         fn disconnect_socket(&mut self);
  88 }
  89
  90 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  91 /// generate no further read_event/write_buffer_space_avail calls for the descriptor, only
  92 /// triggering a single socket_disconnected call (unless it was provided in response to a
  93 /// new_*_connection event, in which case no such socket_disconnected() must be called and the
  94 /// socket silently disconencted).
  95 pub struct PeerHandleError {
  96         /// Used to indicate that we probably can't make any future connections to this peer, implying
  97         /// we should go ahead and force-close any channels we have with it.
  98         pub no_connection_possible: bool,
  99 }
 100 impl fmt::Debug for PeerHandleError {
 101         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 102                 formatter.write_str("Peer Sent Invalid Data")
 103         }
 104 }
 105 impl fmt::Display for PeerHandleError {
 106         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
 107                 formatter.write_str("Peer Sent Invalid Data")
 108         }
 109 }
 110 impl error::Error for PeerHandleError {
 111         fn description(&self) -> &str {
 112                 "Peer Sent Invalid Data"
 113         }
 114 }
 115
 116 enum InitSyncTracker{
 117         NoSyncRequested,
 118         ChannelsSyncing(u64),
 119         NodesSyncing(PublicKey),
 120 }
 121
 122 struct Peer {
 123         channel_encryptor: PeerChannelEncryptor,
 124         outbound: bool,
 125         their_node_id: Option<PublicKey>,
 126         their_features: Option<InitFeatures>,
 127
 128         pending_outbound_buffer: LinkedList<Vec<u8>>,
 129         pending_outbound_buffer_first_msg_offset: usize,
 130         awaiting_write_event: bool,
 131
 132         pending_read_buffer: Vec<u8>,
 133         pending_read_buffer_pos: usize,
 134         pending_read_is_header: bool,
 135
 136         sync_status: InitSyncTracker,
 137
 138         awaiting_pong: bool,
 139 }
 140
 141 impl Peer {
 142         /// Returns true if the channel announcements/updates for the given channel should be
 143         /// forwarded to this peer.
 144         /// If we are sending our routing table to this peer and we have not yet sent channel
 145         /// announcements/updates for the given channel_id then we will send it when we get to that
 146         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 147         /// sent the old versions, we should send the update, and so return true here.
 148         fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
 149                 match self.sync_status {
 150                         InitSyncTracker::NoSyncRequested => true,
 151                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 152                         InitSyncTracker::NodesSyncing(_) => true,
 153                 }
 154         }
 155
 156         /// Similar to the above, but for node announcements indexed by node_id.
 157         fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
 158                 match self.sync_status {
 159                         InitSyncTracker::NoSyncRequested => true,
 160                         InitSyncTracker::ChannelsSyncing(_) => false,
 161                         InitSyncTracker::NodesSyncing(pk) => pk < node_id,
 162                 }
 163         }
 164 }
 165
 166 struct PeerHolder<Descriptor: SocketDescriptor> {
 167         peers: HashMap<Descriptor, Peer>,
 168         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 169         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 170         peers_needing_send: HashSet<Descriptor>,
 171         /// Only add to this set when noise completes:
 172         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 173 }
 174
 175 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 176 fn _check_usize_is_32_or_64() {
 177         // See below, less than 32 bit pointers may be unsafe here!
 178         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 179 }
 180
 181 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
 182 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
 183 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
 184 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
 185 /// issues such as overly long function definitions.
 186 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>>>;
 187
 188 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
 189 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
 190 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
 191 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
 192 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
 193 /// helps with issues such as long function definitions.
 194 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>;
 195
 196 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 197 /// events into messages which it passes on to its MessageHandlers.
 198 ///
 199 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
 200 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
 201 /// essentially you should default to using a SimpleRefPeerManager, and use a
 202 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
 203 /// you're using lightning-net-tokio.
 204 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> where
 205                 CM::Target: ChannelMessageHandler,
 206                 RM::Target: RoutingMessageHandler,
 207                 L::Target: Logger {
 208         message_handler: MessageHandler<CM, RM>,
 209         peers: Mutex<PeerHolder<Descriptor>>,
 210         our_node_secret: SecretKey,
 211         ephemeral_key_midstate: Sha256Engine,
 212
 213         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 214         // bits we will never realistically count into high:
 215         peer_counter_low: AtomicUsize,
 216         peer_counter_high: AtomicUsize,
 217
 218         logger: L,
 219 }
 220
 221 enum MessageHandlingError {
 222         PeerHandleError(PeerHandleError),
 223         LightningError(LightningError),
 224 }
 225
 226 impl From<PeerHandleError> for MessageHandlingError {
 227         fn from(error: PeerHandleError) -> Self {
 228                 MessageHandlingError::PeerHandleError(error)
 229         }
 230 }
 231
 232 impl From<LightningError> for MessageHandlingError {
 233         fn from(error: LightningError) -> Self {
 234                 MessageHandlingError::LightningError(error)
 235         }
 236 }
 237
 238 macro_rules! encode_msg {
 239         ($msg: expr) => {{
 240                 let mut buffer = VecWriter(Vec::new());
 241                 wire::write($msg, &mut buffer).unwrap();
 242                 buffer.0
 243         }}
 244 }
 245
 246 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 247 /// PeerIds may repeat, but only after socket_disconnected() has been called.
 248 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> PeerManager<Descriptor, CM, RM, L> where
 249                 CM::Target: ChannelMessageHandler,
 250                 RM::Target: RoutingMessageHandler,
 251                 L::Target: Logger {
 252         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 253         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 254         /// cryptographically secure random bytes.
 255         pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
 256                 let mut ephemeral_key_midstate = Sha256::engine();
 257                 ephemeral_key_midstate.input(ephemeral_random_data);
 258
 259                 PeerManager {
 260                         message_handler,
 261                         peers: Mutex::new(PeerHolder {
 262                                 peers: HashMap::new(),
 263                                 peers_needing_send: HashSet::new(),
 264                                 node_id_to_descriptor: HashMap::new()
 265                         }),
 266                         our_node_secret,
 267                         ephemeral_key_midstate,
 268                         peer_counter_low: AtomicUsize::new(0),
 269                         peer_counter_high: AtomicUsize::new(0),
 270                         logger,
 271                 }
 272         }
 273
 274         /// Get the list of node ids for peers which have completed the initial handshake.
 275         ///
 276         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 277         /// new_outbound_connection, however entries will only appear once the initial handshake has
 278         /// completed and we are sure the remote peer has the private key for the given node_id.
 279         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 280                 let peers = self.peers.lock().unwrap();
 281                 peers.peers.values().filter_map(|p| {
 282                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
 283                                 return None;
 284                         }
 285                         p.their_node_id
 286                 }).collect()
 287         }
 288
 289         fn get_ephemeral_key(&self) -> SecretKey {
 290                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 291                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 292                 let high = if low == 0 {
 293                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 294                 } else {
 295                         self.peer_counter_high.load(Ordering::Acquire)
 296                 };
 297                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 298                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 299                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 300         }
 301
 302         /// Indicates a new outbound connection has been established to a node with the given node_id.
 303         /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
 304         /// descriptor but must disconnect the connection immediately.
 305         ///
 306         /// Returns a small number of bytes to send to the remote node (currently always 50).
 307         ///
 308         /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
 309         /// socket_disconnected().
 310         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 311                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 312                 let res = peer_encryptor.get_act_one().to_vec();
 313                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 314
 315                 let mut peers = self.peers.lock().unwrap();
 316                 if peers.peers.insert(descriptor, Peer {
 317                         channel_encryptor: peer_encryptor,
 318                         outbound: true,
 319                         their_node_id: None,
 320                         their_features: None,
 321
 322                         pending_outbound_buffer: LinkedList::new(),
 323                         pending_outbound_buffer_first_msg_offset: 0,
 324                         awaiting_write_event: false,
 325
 326                         pending_read_buffer,
 327                         pending_read_buffer_pos: 0,
 328                         pending_read_is_header: false,
 329
 330                         sync_status: InitSyncTracker::NoSyncRequested,
 331
 332                         awaiting_pong: false,
 333                 }).is_some() {
 334                         panic!("PeerManager driver duplicated descriptors!");
 335                 };
 336                 Ok(res)
 337         }
 338
 339         /// Indicates a new inbound connection has been established.
 340         ///
 341         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 342         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 343         /// call socket_disconnected for the new descriptor but must disconnect the connection
 344         /// immediately.
 345         ///
 346         /// Panics if descriptor is duplicative with some other descriptor which has not yet had
 347         /// socket_disconnected called.
 348         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 349                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 350                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 351
 352                 let mut peers = self.peers.lock().unwrap();
 353                 if peers.peers.insert(descriptor, Peer {
 354                         channel_encryptor: peer_encryptor,
 355                         outbound: false,
 356                         their_node_id: None,
 357                         their_features: None,
 358
 359                         pending_outbound_buffer: LinkedList::new(),
 360                         pending_outbound_buffer_first_msg_offset: 0,
 361                         awaiting_write_event: false,
 362
 363                         pending_read_buffer,
 364                         pending_read_buffer_pos: 0,
 365                         pending_read_is_header: false,
 366
 367                         sync_status: InitSyncTracker::NoSyncRequested,
 368
 369                         awaiting_pong: false,
 370                 }).is_some() {
 371                         panic!("PeerManager driver duplicated descriptors!");
 372                 };
 373                 Ok(())
 374         }
 375
 376         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 377                 macro_rules! encode_and_send_msg {
 378                         ($msg: expr) => {
 379                                 {
 380                                         log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 381                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
 382                                 }
 383                         }
 384                 }
 385                 const MSG_BUFF_SIZE: usize = 10;
 386                 while !peer.awaiting_write_event {
 387                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 388                                 match peer.sync_status {
 389                                         InitSyncTracker::NoSyncRequested => {},
 390                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 391                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 392                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
 393                                                 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
 394                                                         encode_and_send_msg!(announce);
 395                                                         if let &Some(ref update_a) = update_a_option {
 396                                                                 encode_and_send_msg!(update_a);
 397                                                         }
 398                                                         if let &Some(ref update_b) = update_b_option {
 399                                                                 encode_and_send_msg!(update_b);
 400                                                         }
 401                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 402                                                 }
 403                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 404                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 405                                                 }
 406                                         },
 407                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 408                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 409                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 410                                                 for msg in all_messages.iter() {
 411                                                         encode_and_send_msg!(msg);
 412                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 413                                                 }
 414                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 415                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 416                                                 }
 417                                         },
 418                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 419                                         InitSyncTracker::NodesSyncing(key) => {
 420                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 421                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 422                                                 for msg in all_messages.iter() {
 423                                                         encode_and_send_msg!(msg);
 424                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 425                                                 }
 426                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 427                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 428                                                 }
 429                                         },
 430                                 }
 431                         }
 432
 433                         if {
 434                                 let next_buff = match peer.pending_outbound_buffer.front() {
 435                                         None => return,
 436                                         Some(buff) => buff,
 437                                 };
 438
 439                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 440                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 441                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 442                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 443                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 444                         } {
 445                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 446                                 peer.pending_outbound_buffer.pop_front();
 447                         } else {
 448                                 peer.awaiting_write_event = true;
 449                         }
 450                 }
 451         }
 452
 453         /// Indicates that there is room to write data to the given socket descriptor.
 454         ///
 455         /// May return an Err to indicate that the connection should be closed.
 456         ///
 457         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 458         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 459         /// invariants around calling write_buffer_space_avail in case a write did not fully complete
 460         /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
 461         /// here isn't sufficient! Panics if the descriptor was not previously registered in a
 462         /// new_\*_connection event.
 463         pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 464                 let mut peers = self.peers.lock().unwrap();
 465                 match peers.peers.get_mut(descriptor) {
 466                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 467                         Some(peer) => {
 468                                 peer.awaiting_write_event = false;
 469                                 self.do_attempt_write_data(descriptor, peer);
 470                         }
 471                 };
 472                 Ok(())
 473         }
 474
 475         /// Indicates that data was read from the given socket descriptor.
 476         ///
 477         /// May return an Err to indicate that the connection should be closed.
 478         ///
 479         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 480         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 481         /// generate send_data calls to handle responses.
 482         ///
 483         /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
 484         /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 485         ///
 486         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 487         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 488                 match self.do_read_event(peer_descriptor, data) {
 489                         Ok(res) => Ok(res),
 490                         Err(e) => {
 491                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 492                                 Err(e)
 493                         }
 494                 }
 495         }
 496
 497         /// Append a message to a peer's pending outbound/write buffer, and update the map of peers needing sends accordingly.
 498         fn enqueue_message<M: Encode + Writeable>(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, descriptor: Descriptor, message: &M) {
 499                 let mut buffer = VecWriter(Vec::new());
 500                 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
 501                 let encoded_message = buffer.0;
 502
 503                 log_trace!(self.logger, "Enqueueing message of type {} to {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 504                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
 505                 peers_needing_send.insert(descriptor);
 506         }
 507
 508         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
 509                 let pause_read = {
 510                         let mut peers_lock = self.peers.lock().unwrap();
 511                         let peers = &mut *peers_lock;
 512                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 513                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 514                                 Some(peer) => {
 515                                         assert!(peer.pending_read_buffer.len() > 0);
 516                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 517
 518                                         let mut read_pos = 0;
 519                                         while read_pos < data.len() {
 520                                                 {
 521                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 522                                                         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]);
 523                                                         read_pos += data_to_copy;
 524                                                         peer.pending_read_buffer_pos += data_to_copy;
 525                                                 }
 526
 527                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 528                                                         peer.pending_read_buffer_pos = 0;
 529
 530                                                         macro_rules! try_potential_handleerror {
 531                                                                 ($thing: expr) => {
 532                                                                         match $thing {
 533                                                                                 Ok(x) => x,
 534                                                                                 Err(e) => {
 535                                                                                         match e.action {
 536                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 537                                                                                                         //TODO: Try to push msg
 538                                                                                                         log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
 539                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 540                                                                                                 },
 541                                                                                                 msgs::ErrorAction::IgnoreError => {
 542                                                                                                         log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
 543                                                                                                         continue;
 544                                                                                                 },
 545                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 546                                                                                                         log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
 547                                                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &msg);
 548                                                                                                         continue;
 549                                                                                                 },
 550                                                                                         }
 551                                                                                 }
 552                                                                         };
 553                                                                 }
 554                                                         }
 555
 556                                                         macro_rules! insert_node_id {
 557                                                                 () => {
 558                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 559                                                                                 hash_map::Entry::Occupied(_) => {
 560                                                                                         log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 561                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 562                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 563                                                                                 },
 564                                                                                 hash_map::Entry::Vacant(entry) => {
 565                                                                                         log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 566                                                                                         entry.insert(peer_descriptor.clone())
 567                                                                                 },
 568                                                                         };
 569                                                                 }
 570                                                         }
 571
 572                                                         let next_step = peer.channel_encryptor.get_noise_step();
 573                                                         match next_step {
 574                                                                 NextNoiseStep::ActOne => {
 575                                                                         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();
 576                                                                         peer.pending_outbound_buffer.push_back(act_two);
 577                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 578                                                                 },
 579                                                                 NextNoiseStep::ActTwo => {
 580                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 581                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 582                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 583                                                                         peer.pending_read_is_header = true;
 584
 585                                                                         peer.their_node_id = Some(their_node_id);
 586                                                                         insert_node_id!();
 587                                                                         let features = InitFeatures::known();
 588                                                                         let resp = msgs::Init { features };
 589                                                                         self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
 590                                                                 },
 591                                                                 NextNoiseStep::ActThree => {
 592                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 593                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 594                                                                         peer.pending_read_is_header = true;
 595                                                                         peer.their_node_id = Some(their_node_id);
 596                                                                         insert_node_id!();
 597                                                                 },
 598                                                                 NextNoiseStep::NoiseComplete => {
 599                                                                         if peer.pending_read_is_header {
 600                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 601                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 602                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 603                                                                                 if msg_len < 2 { // Need at least the message type tag
 604                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 605                                                                                 }
 606                                                                                 peer.pending_read_is_header = false;
 607                                                                         } else {
 608                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 609                                                                                 assert!(msg_data.len() >= 2);
 610
 611                                                                                 // Reset read buffer
 612                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 613                                                                                 peer.pending_read_is_header = true;
 614
 615                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
 616                                                                                 let message_result = wire::read(&mut reader);
 617                                                                                 let message = match message_result {
 618                                                                                         Ok(x) => x,
 619                                                                                         Err(e) => {
 620                                                                                                 match e {
 621                                                                                                         msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
 622                                                                                                         msgs::DecodeError::UnknownRequiredFeature => {
 623                                                                                                                 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 624                                                                                                                 continue;
 625                                                                                                         }
 626                                                                                                         msgs::DecodeError::InvalidValue => {
 627                                                                                                                 log_debug!(self.logger, "Got an invalid value while deserializing message");
 628                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 629                                                                                                         }
 630                                                                                                         msgs::DecodeError::ShortRead => {
 631                                                                                                                 log_debug!(self.logger, "Deserialization failed due to shortness of message");
 632                                                                                                                 return Err(PeerHandleError { no_connection_possible: false });
 633                                                                                                         }
 634                                                                                                         msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
 635                                                                                                         msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
 636                                                                                                 }
 637                                                                                         }
 638                                                                                 };
 639
 640                                                                                 if let Err(handling_error) = self.handle_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), message){
 641                                                                                         match handling_error {
 642                                                                                                 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
 643                                                                                                 MessageHandlingError::LightningError(e) => {
 644                                                                                                         try_potential_handleerror!(Err(e));
 645                                                                                                 },
 646                                                                                         }
 647                                                                                 }
 648                                                                         }
 649                                                                 }
 650                                                         }
 651                                                 }
 652                                         }
 653
 654                                         self.do_attempt_write_data(peer_descriptor, peer);
 655
 656                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 657                                 }
 658                         };
 659
 660                         pause_read
 661                 };
 662
 663                 Ok(pause_read)
 664         }
 665
 666         /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
 667         fn handle_message(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, peer_descriptor: Descriptor, message: wire::Message) -> Result<(), MessageHandlingError> {
 668                 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
 669
 670                 // Need an Init as first message
 671                 if let wire::Message::Init(_) = message {
 672                 } else if peer.their_features.is_none() {
 673                         log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 674                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 675                 }
 676
 677                 match message {
 678                         // Setup and Control messages:
 679                         wire::Message::Init(msg) => {
 680                                 if msg.features.requires_unknown_bits() {
 681                                         log_info!(self.logger, "Peer global features required unknown version bits");
 682                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 683                                 }
 684                                 if msg.features.requires_unknown_bits() {
 685                                         log_info!(self.logger, "Peer local features required unknown version bits");
 686                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 687                                 }
 688                                 if peer.their_features.is_some() {
 689                                         return Err(PeerHandleError{ no_connection_possible: false }.into());
 690                                 }
 691
 692                                 log_info!(
 693                                         self.logger, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, gossip_queries: {}, static_remote_key: {}, unknown flags (local and global): {}",
 694                                         if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
 695                                         if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
 696                                         if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 697                                         if msg.features.supports_gossip_queries() { "supported" } else { "not supported" },
 698                                         if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
 699                                         if msg.features.supports_unknown_bits() { "present" } else { "none" }
 700                                 );
 701
 702                                 if msg.features.initial_routing_sync() {
 703                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 704                                         peers_needing_send.insert(peer_descriptor.clone());
 705                                 }
 706                                 if !msg.features.supports_static_remote_key() {
 707                                         log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
 708                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 709                                 }
 710
 711                                 if !peer.outbound {
 712                                         let features = InitFeatures::known();
 713                                         let resp = msgs::Init { features };
 714                                         self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
 715                                 }
 716
 717                                 self.message_handler.route_handler.sync_routing_table(&peer.their_node_id.unwrap(), &msg);
 718
 719                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
 720                                 peer.their_features = Some(msg.features);
 721                         },
 722                         wire::Message::Error(msg) => {
 723                                 let mut data_is_printable = true;
 724                                 for b in msg.data.bytes() {
 725                                         if b < 32 || b > 126 {
 726                                                 data_is_printable = false;
 727                                                 break;
 728                                         }
 729                                 }
 730
 731                                 if data_is_printable {
 732                                         log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 733                                 } else {
 734                                         log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 735                                 }
 736                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 737                                 if msg.channel_id == [0; 32] {
 738                                         return Err(PeerHandleError{ no_connection_possible: true }.into());
 739                                 }
 740                         },
 741
 742                         wire::Message::Ping(msg) => {
 743                                 if msg.ponglen < 65532 {
 744                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 745                                         self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
 746                                 }
 747                         },
 748                         wire::Message::Pong(_msg) => {
 749                                 peer.awaiting_pong = false;
 750                         },
 751
 752                         // Channel messages:
 753                         wire::Message::OpenChannel(msg) => {
 754                                 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 755                         },
 756                         wire::Message::AcceptChannel(msg) => {
 757                                 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
 758                         },
 759
 760                         wire::Message::FundingCreated(msg) => {
 761                                 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
 762                         },
 763                         wire::Message::FundingSigned(msg) => {
 764                                 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
 765                         },
 766                         wire::Message::FundingLocked(msg) => {
 767                                 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
 768                         },
 769
 770                         wire::Message::Shutdown(msg) => {
 771                                 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg);
 772                         },
 773                         wire::Message::ClosingSigned(msg) => {
 774                                 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
 775                         },
 776
 777                         // Commitment messages:
 778                         wire::Message::UpdateAddHTLC(msg) => {
 779                                 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
 780                         },
 781                         wire::Message::UpdateFulfillHTLC(msg) => {
 782                                 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
 783                         },
 784                         wire::Message::UpdateFailHTLC(msg) => {
 785                                 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
 786                         },
 787                         wire::Message::UpdateFailMalformedHTLC(msg) => {
 788                                 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
 789                         },
 790
 791                         wire::Message::CommitmentSigned(msg) => {
 792                                 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
 793                         },
 794                         wire::Message::RevokeAndACK(msg) => {
 795                                 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
 796                         },
 797                         wire::Message::UpdateFee(msg) => {
 798                                 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
 799                         },
 800                         wire::Message::ChannelReestablish(msg) => {
 801                                 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
 802                         },
 803
 804                         // Routing messages:
 805                         wire::Message::AnnouncementSignatures(msg) => {
 806                                 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
 807                         },
 808                         wire::Message::ChannelAnnouncement(msg) => {
 809                                 let should_forward = match self.message_handler.route_handler.handle_channel_announcement(&msg) {
 810                                         Ok(v) => v,
 811                                         Err(e) => { return Err(e.into()); },
 812                                 };
 813
 814                                 if should_forward {
 815                                         // TODO: forward msg along to all our other peers!
 816                                 }
 817                         },
 818                         wire::Message::NodeAnnouncement(msg) => {
 819                                 let should_forward = match self.message_handler.route_handler.handle_node_announcement(&msg) {
 820                                         Ok(v) => v,
 821                                         Err(e) => { return Err(e.into()); },
 822                                 };
 823
 824                                 if should_forward {
 825                                         // TODO: forward msg along to all our other peers!
 826                                 }
 827                         },
 828                         wire::Message::ChannelUpdate(msg) => {
 829                                 let should_forward = match self.message_handler.route_handler.handle_channel_update(&msg) {
 830                                         Ok(v) => v,
 831                                         Err(e) => { return Err(e.into()); },
 832                                 };
 833
 834                                 if should_forward {
 835                                         // TODO: forward msg along to all our other peers!
 836                                 }
 837                         },
 838                         wire::Message::QueryShortChannelIds(msg) => {
 839                                 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
 840                         },
 841                         wire::Message::ReplyShortChannelIdsEnd(msg) => {
 842                                 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
 843                         },
 844                         wire::Message::QueryChannelRange(msg) => {
 845                                 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
 846                         },
 847                         wire::Message::ReplyChannelRange(msg) => {
 848                                 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
 849                         },
 850                         wire::Message::GossipTimestampFilter(_msg) => {
 851                                 // TODO: handle message
 852                         },
 853
 854                         // Unknown messages:
 855                         wire::Message::Unknown(msg_type) if msg_type.is_even() => {
 856                                 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
 857                                 // Fail the channel if message is an even, unknown type as per BOLT #1.
 858                                 return Err(PeerHandleError{ no_connection_possible: true }.into());
 859                         },
 860                         wire::Message::Unknown(msg_type) => {
 861                                 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
 862                         }
 863                 };
 864                 Ok(())
 865         }
 866
 867         /// Checks for any events generated by our handlers and processes them. Includes sending most
 868         /// response messages as well as messages generated by calls to handler functions directly (eg
 869         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
 870         pub fn process_events(&self) {
 871                 {
 872                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 873                         // buffer by doing things like announcing channels on another node. We should be willing to
 874                         // drop optional-ish messages when send buffers get full!
 875
 876                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
 877                         events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
 878                         let mut peers_lock = self.peers.lock().unwrap();
 879                         let peers = &mut *peers_lock;
 880                         for event in events_generated.drain(..) {
 881                                 macro_rules! get_peer_for_forwarding {
 882                                         ($node_id: expr, $handle_no_such_peer: block) => {
 883                                                 {
 884                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 885                                                                 Some(descriptor) => descriptor.clone(),
 886                                                                 None => {
 887                                                                         $handle_no_such_peer;
 888                                                                         continue;
 889                                                                 },
 890                                                         };
 891                                                         match peers.peers.get_mut(&descriptor) {
 892                                                                 Some(peer) => {
 893                                                                         if peer.their_features.is_none() {
 894                                                                                 $handle_no_such_peer;
 895                                                                                 continue;
 896                                                                         }
 897                                                                         (descriptor, peer)
 898                                                                 },
 899                                                                 None => panic!("Inconsistent peers set state!"),
 900                                                         }
 901                                                 }
 902                                         }
 903                                 }
 904                                 match event {
 905                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
 906                                                 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
 907                                                                 log_pubkey!(node_id),
 908                                                                 log_bytes!(msg.temporary_channel_id));
 909                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 910                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 911                                                         });
 912                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 913                                                 self.do_attempt_write_data(&mut descriptor, peer);
 914                                         },
 915                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
 916                                                 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
 917                                                                 log_pubkey!(node_id),
 918                                                                 log_bytes!(msg.temporary_channel_id));
 919                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 920                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 921                                                         });
 922                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 923                                                 self.do_attempt_write_data(&mut descriptor, peer);
 924                                         },
 925                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
 926                                                 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
 927                                                                 log_pubkey!(node_id),
 928                                                                 log_bytes!(msg.temporary_channel_id),
 929                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
 930                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 931                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 932                                                                 //they should just throw away this funding transaction
 933                                                         });
 934                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 935                                                 self.do_attempt_write_data(&mut descriptor, peer);
 936                                         },
 937                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
 938                                                 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
 939                                                                 log_pubkey!(node_id),
 940                                                                 log_bytes!(msg.channel_id));
 941                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 942                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 943                                                                 //they should just throw away this funding transaction
 944                                                         });
 945                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 946                                                 self.do_attempt_write_data(&mut descriptor, peer);
 947                                         },
 948                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
 949                                                 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
 950                                                                 log_pubkey!(node_id),
 951                                                                 log_bytes!(msg.channel_id));
 952                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 953                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 954                                                         });
 955                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 956                                                 self.do_attempt_write_data(&mut descriptor, peer);
 957                                         },
 958                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
 959                                                 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
 960                                                                 log_pubkey!(node_id),
 961                                                                 log_bytes!(msg.channel_id));
 962                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 963                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 964                                                                 //they should just throw away this funding transaction
 965                                                         });
 966                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 967                                                 self.do_attempt_write_data(&mut descriptor, peer);
 968                                         },
 969                                         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 } } => {
 970                                                 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
 971                                                                 log_pubkey!(node_id),
 972                                                                 update_add_htlcs.len(),
 973                                                                 update_fulfill_htlcs.len(),
 974                                                                 update_fail_htlcs.len(),
 975                                                                 log_bytes!(commitment_signed.channel_id));
 976                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 977                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 978                                                         });
 979                                                 for msg in update_add_htlcs {
 980                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 981                                                 }
 982                                                 for msg in update_fulfill_htlcs {
 983                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 984                                                 }
 985                                                 for msg in update_fail_htlcs {
 986                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 987                                                 }
 988                                                 for msg in update_fail_malformed_htlcs {
 989                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 990                                                 }
 991                                                 if let &Some(ref msg) = update_fee {
 992                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
 993                                                 }
 994                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
 995                                                 self.do_attempt_write_data(&mut descriptor, peer);
 996                                         },
 997                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 998                                                 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
 999                                                                 log_pubkey!(node_id),
1000                                                                 log_bytes!(msg.channel_id));
1001                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1002                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1003                                                         });
1004                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1005                                                 self.do_attempt_write_data(&mut descriptor, peer);
1006                                         },
1007                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1008                                                 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1009                                                                 log_pubkey!(node_id),
1010                                                                 log_bytes!(msg.channel_id));
1011                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1012                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1013                                                         });
1014                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1015                                                 self.do_attempt_write_data(&mut descriptor, peer);
1016                                         },
1017                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1018                                                 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1019                                                                 log_pubkey!(node_id),
1020                                                                 log_bytes!(msg.channel_id));
1021                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1022                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1023                                                         });
1024                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1025                                                 self.do_attempt_write_data(&mut descriptor, peer);
1026                                         },
1027                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1028                                                 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1029                                                                 log_pubkey!(node_id),
1030                                                                 log_bytes!(msg.channel_id));
1031                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1032                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
1033                                                         });
1034                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1035                                                 self.do_attempt_write_data(&mut descriptor, peer);
1036                                         },
1037                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1038                                                 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1039                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
1040                                                         let encoded_msg = encode_msg!(msg);
1041                                                         let encoded_update_msg = encode_msg!(update_msg);
1042
1043                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1044                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1045                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1046                                                                         continue
1047                                                                 }
1048                                                                 match peer.their_node_id {
1049                                                                         None => continue,
1050                                                                         Some(their_node_id) => {
1051                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
1052                                                                                         continue
1053                                                                                 }
1054                                                                         }
1055                                                                 }
1056                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1057                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
1058                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1059                                                         }
1060                                                 }
1061                                         },
1062                                         MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
1063                                                 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1064                                                 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
1065                                                         let encoded_msg = encode_msg!(msg);
1066
1067                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1068                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1069                                                                                 !peer.should_forward_node_announcement(msg.contents.node_id) {
1070                                                                         continue
1071                                                                 }
1072                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1073                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1074                                                         }
1075                                                 }
1076                                         },
1077                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1078                                                 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1079                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1080                                                         let encoded_msg = encode_msg!(msg);
1081
1082                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1083                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1084                                                                                 !peer.should_forward_channel_announcement(msg.contents.short_channel_id)  {
1085                                                                         continue
1086                                                                 }
1087                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1088                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1089                                                         }
1090                                                 }
1091                                         },
1092                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1093                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1094                                         },
1095                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1096                                                 match *action {
1097                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1098                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1099                                                                         peers.peers_needing_send.remove(&descriptor);
1100                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
1101                                                                                 if let Some(ref msg) = *msg {
1102                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1103                                                                                                         log_pubkey!(node_id),
1104                                                                                                         msg.data);
1105                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1106                                                                                         // This isn't guaranteed to work, but if there is enough free
1107                                                                                         // room in the send buffer, put the error message there...
1108                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1109                                                                                 } else {
1110                                                                                         log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1111                                                                                 }
1112                                                                         }
1113                                                                         descriptor.disconnect_socket();
1114                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1115                                                                 }
1116                                                         },
1117                                                         msgs::ErrorAction::IgnoreError => {},
1118                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1119                                                                 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1120                                                                                 log_pubkey!(node_id),
1121                                                                                 msg.data);
1122                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1123                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1124                                                                 });
1125                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1126                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1127                                                         },
1128                                                 }
1129                                         },
1130                                         MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1131                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1132                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1133                                                 self.do_attempt_write_data(&mut descriptor, peer);
1134                                         },
1135                                         MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1136                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1137                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1138                                                 self.do_attempt_write_data(&mut descriptor, peer);
1139                                         }
1140                                 }
1141                         }
1142
1143                         for mut descriptor in peers.peers_needing_send.drain() {
1144                                 match peers.peers.get_mut(&descriptor) {
1145                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1146                                         None => panic!("Inconsistent peers set state!"),
1147                                 }
1148                         }
1149                 }
1150         }
1151
1152         /// Indicates that the given socket descriptor's connection is now closed.
1153         ///
1154         /// This must only be called if the socket has been disconnected by the peer or your own
1155         /// decision to disconnect it and must NOT be called in any case where other parts of this
1156         /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1157         /// the peer.
1158         ///
1159         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1160         pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1161                 self.disconnect_event_internal(descriptor, false);
1162         }
1163
1164         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1165                 let mut peers = self.peers.lock().unwrap();
1166                 peers.peers_needing_send.remove(descriptor);
1167                 let peer_option = peers.peers.remove(descriptor);
1168                 match peer_option {
1169                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1170                         Some(peer) => {
1171                                 match peer.their_node_id {
1172                                         Some(node_id) => {
1173                                                 peers.node_id_to_descriptor.remove(&node_id);
1174                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1175                                         },
1176                                         None => {}
1177                                 }
1178                         }
1179                 };
1180         }
1181
1182         /// This function should be called roughly once every 30 seconds.
1183         /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1184
1185         /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1186         pub fn timer_tick_occured(&self) {
1187                 let mut peers_lock = self.peers.lock().unwrap();
1188                 {
1189                         let peers = &mut *peers_lock;
1190                         let peers_needing_send = &mut peers.peers_needing_send;
1191                         let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1192                         let peers = &mut peers.peers;
1193                         let mut descriptors_needing_disconnect = Vec::new();
1194
1195                         peers.retain(|descriptor, peer| {
1196                                 if peer.awaiting_pong {
1197                                         peers_needing_send.remove(descriptor);
1198                                         descriptors_needing_disconnect.push(descriptor.clone());
1199                                         match peer.their_node_id {
1200                                                 Some(node_id) => {
1201                                                         log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1202                                                         node_id_to_descriptor.remove(&node_id);
1203                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1204                                                 }
1205                                                 None => {
1206                                                         // This can't actually happen as we should have hit
1207                                                         // is_ready_for_encryption() previously on this same peer.
1208                                                         unreachable!();
1209                                                 },
1210                                         }
1211                                         return false;
1212                                 }
1213
1214                                 if !peer.channel_encryptor.is_ready_for_encryption() {
1215                                         // The peer needs to complete its handshake before we can exchange messages
1216                                         return true;
1217                                 }
1218
1219                                 let ping = msgs::Ping {
1220                                         ponglen: 0,
1221                                         byteslen: 64,
1222                                 };
1223                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1224
1225                                 let mut descriptor_clone = descriptor.clone();
1226                                 self.do_attempt_write_data(&mut descriptor_clone, peer);
1227
1228                                 peer.awaiting_pong = true;
1229                                 true
1230                         });
1231
1232                         for mut descriptor in descriptors_needing_disconnect.drain(..) {
1233                                 descriptor.disconnect_socket();
1234                         }
1235                 }
1236         }
1237 }
1238
1239 #[cfg(test)]
1240 mod tests {
1241         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1242         use ln::msgs;
1243         use util::events;
1244         use util::test_utils;
1245
1246         use bitcoin::secp256k1::Secp256k1;
1247         use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1248
1249         use std;
1250         use std::sync::{Arc, Mutex};
1251         use std::sync::atomic::Ordering;
1252
1253         #[derive(Clone)]
1254         struct FileDescriptor {
1255                 fd: u16,
1256                 outbound_data: Arc<Mutex<Vec<u8>>>,
1257         }
1258         impl PartialEq for FileDescriptor {
1259                 fn eq(&self, other: &Self) -> bool {
1260                         self.fd == other.fd
1261                 }
1262         }
1263         impl Eq for FileDescriptor { }
1264         impl std::hash::Hash for FileDescriptor {
1265                 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1266                         self.fd.hash(hasher)
1267                 }
1268         }
1269
1270         impl SocketDescriptor for FileDescriptor {
1271                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1272                         self.outbound_data.lock().unwrap().extend_from_slice(data);
1273                         data.len()
1274                 }
1275
1276                 fn disconnect_socket(&mut self) {}
1277         }
1278
1279         struct PeerManagerCfg {
1280                 chan_handler: test_utils::TestChannelMessageHandler,
1281                 routing_handler: test_utils::TestRoutingMessageHandler,
1282                 logger: test_utils::TestLogger,
1283         }
1284
1285         fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1286                 let mut cfgs = Vec::new();
1287                 for _ in 0..peer_count {
1288                         cfgs.push(
1289                                 PeerManagerCfg{
1290                                         chan_handler: test_utils::TestChannelMessageHandler::new(),
1291                                         logger: test_utils::TestLogger::new(),
1292                                         routing_handler: test_utils::TestRoutingMessageHandler::new(),
1293                                 }
1294                         );
1295                 }
1296
1297                 cfgs
1298         }
1299
1300         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>> {
1301                 let mut peers = Vec::new();
1302                 for i in 0..peer_count {
1303                         let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1304                         let ephemeral_bytes = [i as u8; 32];
1305                         let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1306                         let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger);
1307                         peers.push(peer);
1308                 }
1309
1310                 peers
1311         }
1312
1313         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) {
1314                 let secp_ctx = Secp256k1::new();
1315                 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1316                 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1317                 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1318                 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1319                 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1320                 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1321                 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1322                 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1323                 (fd_a.clone(), fd_b.clone())
1324         }
1325
1326         #[test]
1327         fn test_disconnect_peer() {
1328                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1329                 // push a DisconnectPeer event to remove the node flagged by id
1330                 let cfgs = create_peermgr_cfgs(2);
1331                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1332                 let mut peers = create_network(2, &cfgs);
1333                 establish_connection(&peers[0], &peers[1]);
1334                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1335
1336                 let secp_ctx = Secp256k1::new();
1337                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1338
1339                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1340                         node_id: their_id,
1341                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1342                 });
1343                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1344                 peers[0].message_handler.chan_handler = &chan_handler;
1345
1346                 peers[0].process_events();
1347                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1348         }
1349
1350         #[test]
1351         fn test_timer_tick_occurred() {
1352                 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1353                 let cfgs = create_peermgr_cfgs(2);
1354                 let peers = create_network(2, &cfgs);
1355                 establish_connection(&peers[0], &peers[1]);
1356                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1357
1358                 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1359                 peers[0].timer_tick_occured();
1360                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1361
1362                 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1363                 peers[0].timer_tick_occured();
1364                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1365         }
1366
1367         #[test]
1368         fn test_do_attempt_write_data() {
1369                 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1370                 let cfgs = create_peermgr_cfgs(2);
1371                 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1372                 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1373                 let peers = create_network(2, &cfgs);
1374
1375                 // By calling establish_connect, we trigger do_attempt_write_data between
1376                 // the peers. Previously this function would mistakenly enter an infinite loop
1377                 // when there were more channel messages available than could fit into a peer's
1378                 // buffer. This issue would now be detected by this test (because we use custom
1379                 // RoutingMessageHandlers that intentionally return more channel messages
1380                 // than can fit into a peer's buffer).
1381                 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1382
1383                 // Make each peer to read the messages that the other peer just wrote to them.
1384                 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1385                 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1386
1387                 // Check that each peer has received the expected number of channel updates and channel
1388                 // announcements.
1389                 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1390                 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1391                 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1392                 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1393         }
1394 }