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

   1 //! Top level peer message handling and socket handling logic lives here.
   2 //! Instead of actually servicing sockets ourselves we require that you implement the
   3 //! SocketDescriptor interface and use that to receive actions which you should perform on the
   4 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
   5 //! call into the provided message handlers (probably a ChannelManager and Router) with messages
   6 //! they should handle, and encoding/sending response messages.
   7
   8 use secp256k1::key::{SecretKey,PublicKey};
   9
  10 use ln::msgs;
  11 use util::ser::{Writeable, Writer, Readable};
  12 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  13 use util::byte_utils;
  14 use util::events::{EventsProvider,Event};
  15 use util::logger::Logger;
  16
  17 use std::collections::{HashMap,hash_map,LinkedList};
  18 use std::sync::{Arc, Mutex};
  19 use std::sync::atomic::{AtomicUsize, Ordering};
  20 use std::{cmp,error,mem,hash,fmt};
  21
  22 /// Provides references to trait impls which handle different types of messages.
  23 pub struct MessageHandler {
  24         /// A message handler which handles messages specific to channels. Usually this is just a
  25         /// ChannelManager object.
  26         pub chan_handler: Arc<msgs::ChannelMessageHandler>,
  27         /// A message handler which handles messages updating our knowledge of the network channel
  28         /// graph. Usually this is just a Router object.
  29         pub route_handler: Arc<msgs::RoutingMessageHandler>,
  30 }
  31
  32 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  33 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  34 /// implement Hash to meet the PeerManager API.
  35 /// For efficiency, Clone should be relatively cheap for this type.
  36 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  37 /// send_data. Note that if you are using a higher-level net library that may close() itself, be
  38 /// careful to ensure you don't have races whereby you might register a new connection with an fd
  39 /// the same as a yet-to-be-disconnect_event()-ed.
  40 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  41         /// Attempts to send some data from the given Vec starting at the given offset to the peer.
  42         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  43         /// Note that in the disconnected case, a disconnect_event must still fire and further write
  44         /// attempts may occur until that time.
  45         /// If the returned size is smaller than data.len() - write_offset, a write_available event must
  46         /// trigger the next time more data can be written. Additionally, until the a send_data event
  47         /// completes fully, no further read_events should trigger on the same peer!
  48         /// If a read_event on this descriptor had previously returned true (indicating that read
  49         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  50         /// indicating that read events on this descriptor should resume. A resume_read of false does
  51         /// *not* imply that further read events should be paused.
  52         fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, resume_read: bool) -> usize;
  53         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
  54         /// more calls to write_event, read_event or disconnect_event may be made with this descriptor.
  55         /// No disconnect_event should be generated as a result of this call, though obviously races
  56         /// may occur whereby disconnect_socket is called after a call to disconnect_event but prior to
  57         /// that event completing.
  58         fn disconnect_socket(&mut self);
  59 }
  60
  61 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  62 /// generate no further read/write_events for the descriptor, only triggering a single
  63 /// disconnect_event (unless it was provided in response to a new_*_connection event, in which case
  64 /// no such disconnect_event must be generated and the socket be silently disconencted).
  65 pub struct PeerHandleError {
  66         /// Used to indicate that we probably can't make any future connections to this peer, implying
  67         /// we should go ahead and force-close any channels we have with it.
  68         no_connection_possible: bool,
  69 }
  70 impl fmt::Debug for PeerHandleError {
  71         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  72                 formatter.write_str("Peer Sent Invalid Data")
  73         }
  74 }
  75 impl fmt::Display for PeerHandleError {
  76         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  77                 formatter.write_str("Peer Sent Invalid Data")
  78         }
  79 }
  80 impl error::Error for PeerHandleError {
  81         fn description(&self) -> &str {
  82                 "Peer Sent Invalid Data"
  83         }
  84 }
  85
  86 struct Peer {
  87         channel_encryptor: PeerChannelEncryptor,
  88         outbound: bool,
  89         their_node_id: Option<PublicKey>,
  90         their_global_features: Option<msgs::GlobalFeatures>,
  91         their_local_features: Option<msgs::LocalFeatures>,
  92
  93         pending_outbound_buffer: LinkedList<Vec<u8>>,
  94         pending_outbound_buffer_first_msg_offset: usize,
  95         awaiting_write_event: bool,
  96
  97         pending_read_buffer: Vec<u8>,
  98         pending_read_buffer_pos: usize,
  99         pending_read_is_header: bool,
 100 }
 101
 102 struct PeerHolder<Descriptor: SocketDescriptor> {
 103         peers: HashMap<Descriptor, Peer>,
 104         /// Only add to this set when noise completes:
 105         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 106 }
 107 struct MutPeerHolder<'a, Descriptor: SocketDescriptor + 'a> {
 108         peers: &'a mut HashMap<Descriptor, Peer>,
 109         node_id_to_descriptor: &'a mut HashMap<PublicKey, Descriptor>,
 110 }
 111 impl<Descriptor: SocketDescriptor> PeerHolder<Descriptor> {
 112         fn borrow_parts(&mut self) -> MutPeerHolder<Descriptor> {
 113                 MutPeerHolder {
 114                         peers: &mut self.peers,
 115                         node_id_to_descriptor: &mut self.node_id_to_descriptor,
 116                 }
 117         }
 118 }
 119
 120 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 121 /// events into messages which it passes on to its MessageHandlers.
 122 pub struct PeerManager<Descriptor: SocketDescriptor> {
 123         message_handler: MessageHandler,
 124         peers: Mutex<PeerHolder<Descriptor>>,
 125         pending_events: Mutex<Vec<Event>>,
 126         our_node_secret: SecretKey,
 127         initial_syncs_sent: AtomicUsize,
 128         logger: Arc<Logger>,
 129 }
 130
 131 struct VecWriter(Vec<u8>);
 132 impl Writer for VecWriter {
 133         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 134                 self.0.extend_from_slice(buf);
 135                 Ok(())
 136         }
 137         fn size_hint(&mut self, size: usize) {
 138                 self.0.reserve_exact(size);
 139         }
 140 }
 141
 142 macro_rules! encode_msg {
 143         ($msg: expr, $msg_code: expr) => {{
 144                 let mut msg = VecWriter(Vec::new());
 145                 ($msg_code as u16).write(&mut msg).unwrap();
 146                 $msg.write(&mut msg).unwrap();
 147                 msg.0
 148         }}
 149 }
 150
 151 //TODO: Really should do something smarter for this
 152 const INITIAL_SYNCS_TO_SEND: usize = 5;
 153
 154 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 155 /// PeerIds may repeat, but only after disconnect_event() has been called.
 156 impl<Descriptor: SocketDescriptor> PeerManager<Descriptor> {
 157         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 158         pub fn new(message_handler: MessageHandler, our_node_secret: SecretKey, logger: Arc<Logger>) -> PeerManager<Descriptor> {
 159                 PeerManager {
 160                         message_handler: message_handler,
 161                         peers: Mutex::new(PeerHolder { peers: HashMap::new(), node_id_to_descriptor: HashMap::new() }),
 162                         pending_events: Mutex::new(Vec::new()),
 163                         our_node_secret: our_node_secret,
 164                         initial_syncs_sent: AtomicUsize::new(0),
 165                         logger,
 166                 }
 167         }
 168
 169         /// Get the list of node ids for peers which have completed the initial handshake.
 170         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 171         /// new_outbound_connection, however entries will only appear once the initial handshake has
 172         /// completed and we are sure the remote peer has the private key for the given node_id.
 173         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 174                 let peers = self.peers.lock().unwrap();
 175                 peers.peers.values().filter_map(|p| {
 176                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_global_features.is_none() {
 177                                 return None;
 178                         }
 179                         p.their_node_id
 180                 }).collect()
 181         }
 182
 183         /// Indicates a new outbound connection has been established to a node with the given node_id.
 184         /// Note that if an Err is returned here you MUST NOT call disconnect_event for the new
 185         /// descriptor but must disconnect the connection immediately.
 186         /// Returns some bytes to send to the remote node.
 187         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 188         /// disconnect_event.
 189         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 190                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone());
 191                 let res = peer_encryptor.get_act_one().to_vec();
 192                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 193
 194                 let mut peers = self.peers.lock().unwrap();
 195                 if peers.peers.insert(descriptor, Peer {
 196                         channel_encryptor: peer_encryptor,
 197                         outbound: true,
 198                         their_node_id: Some(their_node_id),
 199                         their_global_features: None,
 200                         their_local_features: None,
 201
 202                         pending_outbound_buffer: LinkedList::new(),
 203                         pending_outbound_buffer_first_msg_offset: 0,
 204                         awaiting_write_event: false,
 205
 206                         pending_read_buffer: pending_read_buffer,
 207                         pending_read_buffer_pos: 0,
 208                         pending_read_is_header: false,
 209                 }).is_some() {
 210                         panic!("PeerManager driver duplicated descriptors!");
 211                 };
 212                 Ok(res)
 213         }
 214
 215         /// Indicates a new inbound connection has been established.
 216         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 217         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 218         /// call disconnect_event for the new descriptor but must disconnect the connection
 219         /// immediately.
 220         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 221         /// disconnect_event.
 222         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 223                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 224                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 225
 226                 let mut peers = self.peers.lock().unwrap();
 227                 if peers.peers.insert(descriptor, Peer {
 228                         channel_encryptor: peer_encryptor,
 229                         outbound: false,
 230                         their_node_id: None,
 231                         their_global_features: None,
 232                         their_local_features: None,
 233
 234                         pending_outbound_buffer: LinkedList::new(),
 235                         pending_outbound_buffer_first_msg_offset: 0,
 236                         awaiting_write_event: false,
 237
 238                         pending_read_buffer: pending_read_buffer,
 239                         pending_read_buffer_pos: 0,
 240                         pending_read_is_header: false,
 241                 }).is_some() {
 242                         panic!("PeerManager driver duplicated descriptors!");
 243                 };
 244                 Ok(())
 245         }
 246
 247         fn do_attempt_write_data(descriptor: &mut Descriptor, peer: &mut Peer) {
 248                 while !peer.awaiting_write_event {
 249                         if {
 250                                 let next_buff = match peer.pending_outbound_buffer.front() {
 251                                         None => return,
 252                                         Some(buff) => buff,
 253                                 };
 254                                 let should_be_reading = peer.pending_outbound_buffer.len() < 10;
 255
 256                                 let data_sent = descriptor.send_data(next_buff, peer.pending_outbound_buffer_first_msg_offset, should_be_reading);
 257                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 258                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 259                         } {
 260                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 261                                 peer.pending_outbound_buffer.pop_front();
 262                         } else {
 263                                 peer.awaiting_write_event = true;
 264                         }
 265                 }
 266         }
 267
 268         /// Indicates that there is room to write data to the given socket descriptor.
 269         /// May return an Err to indicate that the connection should be closed.
 270         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 271         /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
 272         /// invariants around calling write_event in case a write did not fully complete must still
 273         /// hold - be ready to call write_event again if a write call generated here isn't sufficient!
 274         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 275         pub fn write_event(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 276                 let mut peers = self.peers.lock().unwrap();
 277                 match peers.peers.get_mut(descriptor) {
 278                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 279                         Some(peer) => {
 280                                 peer.awaiting_write_event = false;
 281                                 Self::do_attempt_write_data(descriptor, peer);
 282                         }
 283                 };
 284                 Ok(())
 285         }
 286
 287         /// Indicates that data was read from the given socket descriptor.
 288         /// May return an Err to indicate that the connection should be closed.
 289         /// Will very likely call send_data on the descriptor passed in (or a descriptor handed into
 290         /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
 291         /// invariants around calling write_event in case a write did not fully complete must still
 292         /// hold. Note that this function will often call send_data on many peers before returning, not
 293         /// just this peer!
 294         /// If Ok(true) is returned, further read_events should not be triggered until a write_event on
 295         /// this file descriptor has resume_read set (preventing DoS issues in the send buffer). Note
 296         /// that this must be true even if a send_data call with resume_read=true was made during the
 297         /// course of this function!
 298         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 299         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 300                 match self.do_read_event(peer_descriptor, data) {
 301                         Ok(res) => Ok(res),
 302                         Err(e) => {
 303                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 304                                 Err(e)
 305                         }
 306                 }
 307         }
 308
 309         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 310                 let pause_read = {
 311                         let mut peers_lock = self.peers.lock().unwrap();
 312                         let peers = peers_lock.borrow_parts();
 313                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 314                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 315                                 Some(peer) => {
 316                                         assert!(peer.pending_read_buffer.len() > 0);
 317                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 318
 319                                         let mut read_pos = 0;
 320                                         while read_pos < data.len() {
 321                                                 {
 322                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 323                                                         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]);
 324                                                         read_pos += data_to_copy;
 325                                                         peer.pending_read_buffer_pos += data_to_copy;
 326                                                 }
 327
 328                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 329                                                         peer.pending_read_buffer_pos = 0;
 330
 331                                                         macro_rules! encode_and_send_msg {
 332                                                                 ($msg: expr, $msg_code: expr) => {
 333                                                                         {
 334                                                                                 log_trace!(self, "Encoding and sending message of type {} to {}", $msg_code, log_pubkey!(peer.their_node_id.unwrap()));
 335                                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
 336                                                                         }
 337                                                                 }
 338                                                         }
 339
 340                                                         macro_rules! try_potential_handleerror {
 341                                                                 ($thing: expr) => {
 342                                                                         match $thing {
 343                                                                                 Ok(x) => x,
 344                                                                                 Err(e) => {
 345                                                                                         if let Some(action) = e.action {
 346                                                                                                 match action {
 347                                                                                                         msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 348                                                                                                                 //TODO: Try to push msg
 349                                                                                                                 log_trace!(self, "Got Err handling message, disconnecting peer because {}", e.err);
 350                                                                                                                 return Err(PeerHandleError{ no_connection_possible: false });
 351                                                                                                         },
 352                                                                                                         msgs::ErrorAction::IgnoreError => {
 353                                                                                                                 log_trace!(self, "Got Err handling message, ignoring because {}", e.err);
 354                                                                                                                 continue;
 355                                                                                                         },
 356                                                                                                         msgs::ErrorAction::SendErrorMessage { msg } => {
 357                                                                                                                 log_trace!(self, "Got Err handling message, sending Error message because {}", e.err);
 358                                                                                                                 encode_and_send_msg!(msg, 17);
 359                                                                                                                 continue;
 360                                                                                                         },
 361                                                                                                 }
 362                                                                                         } else {
 363                                                                                                 log_debug!(self, "Got Err handling message, action not yet filled in: {}", e.err);
 364                                                                                                 return Err(PeerHandleError{ no_connection_possible: false });
 365                                                                                         }
 366                                                                                 }
 367                                                                         };
 368                                                                 }
 369                                                         }
 370
 371                                                         macro_rules! try_potential_decodeerror {
 372                                                                 ($thing: expr) => {
 373                                                                         match $thing {
 374                                                                                 Ok(x) => x,
 375                                                                                 Err(e) => {
 376                                                                                         match e {
 377                                                                                                 msgs::DecodeError::UnknownRealmByte => return Err(PeerHandleError{ no_connection_possible: false }),
 378                                                                                                 msgs::DecodeError::UnknownRequiredFeature => {
 379                                                                                                         log_debug!(self, "Got a channel/node announcement with an known required feature flag, you may want to udpate!");
 380                                                                                                         continue;
 381                                                                                                 },
 382                                                                                                 msgs::DecodeError::BadPublicKey => return Err(PeerHandleError{ no_connection_possible: false }),
 383                                                                                                 msgs::DecodeError::BadSignature => return Err(PeerHandleError{ no_connection_possible: false }),
 384                                                                                                 msgs::DecodeError::BadText => return Err(PeerHandleError{ no_connection_possible: false }),
 385                                                                                                 msgs::DecodeError::ShortRead => return Err(PeerHandleError{ no_connection_possible: false }),
 386                                                                                                 msgs::DecodeError::ExtraAddressesPerType => {
 387                                                                                                         log_debug!(self, "Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
 388                                                                                                         continue;
 389                                                                                                 },
 390                                                                                                 msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError{ no_connection_possible: false }),
 391                                                                                                 msgs::DecodeError::Io(_) => return Err(PeerHandleError{ no_connection_possible: false }),
 392                                                                                                 msgs::DecodeError::InvalidValue => panic!("should not happen with message decoding"),
 393                                                                                         }
 394                                                                                 }
 395                                                                         };
 396                                                                 }
 397                                                         }
 398
 399                                                         macro_rules! insert_node_id {
 400                                                                 () => {
 401                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 402                                                                                 hash_map::Entry::Occupied(_) => {
 403                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 404                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 405                                                                                 },
 406                                                                                 hash_map::Entry::Vacant(entry) => entry.insert(peer_descriptor.clone()),
 407                                                                         };
 408                                                                 }
 409                                                         }
 410
 411                                                         let next_step = peer.channel_encryptor.get_noise_step();
 412                                                         match next_step {
 413                                                                 NextNoiseStep::ActOne => {
 414                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_key(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
 415                                                                         peer.pending_outbound_buffer.push_back(act_two);
 416                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 417                                                                 },
 418                                                                 NextNoiseStep::ActTwo => {
 419                                                                         let act_three = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
 420                                                                         peer.pending_outbound_buffer.push_back(act_three);
 421                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 422                                                                         peer.pending_read_is_header = true;
 423
 424                                                                         insert_node_id!();
 425                                                                         let mut local_features = msgs::LocalFeatures::new();
 426                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 427                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 428                                                                                 local_features.set_initial_routing_sync();
 429                                                                         }
 430                                                                         encode_and_send_msg!(msgs::Init {
 431                                                                                 global_features: msgs::GlobalFeatures::new(),
 432                                                                                 local_features,
 433                                                                         }, 16);
 434                                                                 },
 435                                                                 NextNoiseStep::ActThree => {
 436                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 437                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 438                                                                         peer.pending_read_is_header = true;
 439                                                                         peer.their_node_id = Some(their_node_id);
 440                                                                         insert_node_id!();
 441                                                                 },
 442                                                                 NextNoiseStep::NoiseComplete => {
 443                                                                         if peer.pending_read_is_header {
 444                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 445                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 446                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 447                                                                                 if msg_len < 2 { // Need at least the message type tag
 448                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 449                                                                                 }
 450                                                                                 peer.pending_read_is_header = false;
 451                                                                         } else {
 452                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 453                                                                                 assert!(msg_data.len() >= 2);
 454
 455                                                                                 // Reset read buffer
 456                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 457                                                                                 peer.pending_read_is_header = true;
 458
 459                                                                                 let msg_type = byte_utils::slice_to_be16(&msg_data[0..2]);
 460                                                                                 log_trace!(self, "Received message of type {} from {}", msg_type, log_pubkey!(peer.their_node_id.unwrap()));
 461                                                                                 if msg_type != 16 && peer.their_global_features.is_none() {
 462                                                                                         // Need an init message as first message
 463                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 464                                                                                 }
 465                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[2..]);
 466                                                                                 match msg_type {
 467                                                                                         // Connection control:
 468                                                                                         16 => {
 469                                                                                                 let msg = try_potential_decodeerror!(msgs::Init::read(&mut reader));
 470                                                                                                 if msg.global_features.requires_unknown_bits() {
 471                                                                                                         log_info!(self, "Peer global features required unknown version bits");
 472                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 473                                                                                                 }
 474                                                                                                 if msg.local_features.requires_unknown_bits() {
 475                                                                                                         log_info!(self, "Peer local features required unknown version bits");
 476                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 477                                                                                                 }
 478                                                                                                 if msg.local_features.requires_data_loss_protect() {
 479                                                                                                         log_info!(self, "Peer local features required data_loss_protect");
 480                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 481                                                                                                 }
 482                                                                                                 if msg.local_features.requires_upfront_shutdown_script() {
 483                                                                                                         log_info!(self, "Peer local features required upfront_shutdown_script");
 484                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 485                                                                                                 }
 486                                                                                                 if peer.their_global_features.is_some() {
 487                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 488                                                                                                 }
 489
 490                                                                                                 log_info!(self, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, unkown local flags: {}, unknown global flags: {}",
 491                                                                                                         if msg.local_features.supports_data_loss_protect() { "supported" } else { "not supported"},
 492                                                                                                         if msg.local_features.initial_routing_sync() { "requested" } else { "not requested" },
 493                                                                                                         if msg.local_features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 494                                                                                                         if msg.local_features.supports_unknown_bits() { "present" } else { "none" },
 495                                                                                                         if msg.global_features.supports_unknown_bits() { "present" } else { "none" });
 496
 497                                                                                                 peer.their_global_features = Some(msg.global_features);
 498                                                                                                 peer.their_local_features = Some(msg.local_features);
 499
 500                                                                                                 if !peer.outbound {
 501                                                                                                         let mut local_features = msgs::LocalFeatures::new();
 502                                                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 503                                                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 504                                                                                                                 local_features.set_initial_routing_sync();
 505                                                                                                         }
 506                                                                                                         encode_and_send_msg!(msgs::Init {
 507                                                                                                                 global_features: msgs::GlobalFeatures::new(),
 508                                                                                                                 local_features,
 509                                                                                                         }, 16);
 510                                                                                                 }
 511
 512                                                                                                 for msg in self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap()) {
 513                                                                                                         encode_and_send_msg!(msg, 136);
 514                                                                                                 }
 515                                                                                         },
 516                                                                                         17 => {
 517                                                                                                 let msg = try_potential_decodeerror!(msgs::ErrorMessage::read(&mut reader));
 518                                                                                                 let mut data_is_printable = true;
 519                                                                                                 for b in msg.data.bytes() {
 520                                                                                                         if b < 32 || b > 126 {
 521                                                                                                                 data_is_printable = false;
 522                                                                                                                 break;
 523                                                                                                         }
 524                                                                                                 }
 525
 526                                                                                                 if data_is_printable {
 527                                                                                                         log_debug!(self, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 528                                                                                                 } else {
 529                                                                                                         log_debug!(self, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 530                                                                                                 }
 531                                                                                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 532                                                                                                 if msg.channel_id == [0; 32] {
 533                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 534                                                                                                 }
 535                                                                                         },
 536
 537                                                                                         18 => {
 538                                                                                                 let msg = try_potential_decodeerror!(msgs::Ping::read(&mut reader));
 539                                                                                                 if msg.ponglen < 65532 {
 540                                                                                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 541                                                                                                         encode_and_send_msg!(resp, 19);
 542                                                                                                 }
 543                                                                                         },
 544                                                                                         19 => {
 545                                                                                                 try_potential_decodeerror!(msgs::Pong::read(&mut reader));
 546                                                                                         },
 547
 548                                                                                         // Channel control:
 549                                                                                         32 => {
 550                                                                                                 let msg = try_potential_decodeerror!(msgs::OpenChannel::read(&mut reader));
 551                                                                                                 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg));
 552                                                                                                 encode_and_send_msg!(resp, 33);
 553                                                                                         },
 554                                                                                         33 => {
 555                                                                                                 let msg = try_potential_decodeerror!(msgs::AcceptChannel::read(&mut reader));
 556                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), &msg));
 557                                                                                         },
 558
 559                                                                                         34 => {
 560                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingCreated::read(&mut reader));
 561                                                                                                 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg));
 562                                                                                                 encode_and_send_msg!(resp, 35);
 563                                                                                         },
 564                                                                                         35 => {
 565                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingSigned::read(&mut reader));
 566                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg));
 567                                                                                         },
 568                                                                                         36 => {
 569                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingLocked::read(&mut reader));
 570                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg));
 571                                                                                                 match resp_option {
 572                                                                                                         Some(resp) => encode_and_send_msg!(resp, 259),
 573                                                                                                         None => {},
 574                                                                                                 }
 575                                                                                         },
 576
 577                                                                                         38 => {
 578                                                                                                 let msg = try_potential_decodeerror!(msgs::Shutdown::read(&mut reader));
 579                                                                                                 let resp_options = try_potential_handleerror!(self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg));
 580                                                                                                 if let Some(resp) = resp_options.0 {
 581                                                                                                         encode_and_send_msg!(resp, 38);
 582                                                                                                 }
 583                                                                                                 if let Some(resp) = resp_options.1 {
 584                                                                                                         encode_and_send_msg!(resp, 39);
 585                                                                                                 }
 586                                                                                         },
 587                                                                                         39 => {
 588                                                                                                 let msg = try_potential_decodeerror!(msgs::ClosingSigned::read(&mut reader));
 589                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg));
 590                                                                                                 if let Some(resp) = resp_option {
 591                                                                                                         encode_and_send_msg!(resp, 39);
 592                                                                                                 }
 593                                                                                         },
 594
 595                                                                                         128 => {
 596                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateAddHTLC::read(&mut reader));
 597                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg));
 598                                                                                         },
 599                                                                                         130 => {
 600                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFulfillHTLC::read(&mut reader));
 601                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg));
 602                                                                                         },
 603                                                                                         131 => {
 604                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailHTLC::read(&mut reader));
 605                                                                                                 let chan_update = try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg));
 606                                                                                                 if let Some(update) = chan_update {
 607                                                                                                         self.message_handler.route_handler.handle_htlc_fail_channel_update(&update);
 608                                                                                                 }
 609                                                                                         },
 610                                                                                         135 => {
 611                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailMalformedHTLC::read(&mut reader));
 612                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg));
 613                                                                                         },
 614
 615                                                                                         132 => {
 616                                                                                                 let msg = try_potential_decodeerror!(msgs::CommitmentSigned::read(&mut reader));
 617                                                                                                 let resps = try_potential_handleerror!(self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg));
 618                                                                                                 encode_and_send_msg!(resps.0, 133);
 619                                                                                                 if let Some(resp) = resps.1 {
 620                                                                                                         encode_and_send_msg!(resp, 132);
 621                                                                                                 }
 622                                                                                         },
 623                                                                                         133 => {
 624                                                                                                 let msg = try_potential_decodeerror!(msgs::RevokeAndACK::read(&mut reader));
 625                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg));
 626                                                                                                 match resp_option {
 627                                                                                                         Some(resps) => {
 628                                                                                                                 for resp in resps.update_add_htlcs {
 629                                                                                                                         encode_and_send_msg!(resp, 128);
 630                                                                                                                 }
 631                                                                                                                 for resp in resps.update_fulfill_htlcs {
 632                                                                                                                         encode_and_send_msg!(resp, 130);
 633                                                                                                                 }
 634                                                                                                                 for resp in resps.update_fail_htlcs {
 635                                                                                                                         encode_and_send_msg!(resp, 131);
 636                                                                                                                 }
 637                                                                                                                 encode_and_send_msg!(resps.commitment_signed, 132);
 638                                                                                                         },
 639                                                                                                         None => {},
 640                                                                                                 }
 641                                                                                         },
 642                                                                                         134 => {
 643                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFee::read(&mut reader));
 644                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg));
 645                                                                                         },
 646                                                                                         136 => {
 647                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelReestablish::read(&mut reader));
 648                                                                                                 let (funding_locked, revoke_and_ack, commitment_update) = try_potential_handleerror!(self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg));
 649                                                                                                 if let Some(lock_msg) = funding_locked {
 650                                                                                                         encode_and_send_msg!(lock_msg, 36);
 651                                                                                                 }
 652                                                                                                 if let Some(revoke_msg) = revoke_and_ack {
 653                                                                                                         encode_and_send_msg!(revoke_msg, 133);
 654                                                                                                 }
 655                                                                                                 match commitment_update {
 656                                                                                                         Some(resps) => {
 657                                                                                                                 for resp in resps.update_add_htlcs {
 658                                                                                                                         encode_and_send_msg!(resp, 128);
 659                                                                                                                 }
 660                                                                                                                 for resp in resps.update_fulfill_htlcs {
 661                                                                                                                         encode_and_send_msg!(resp, 130);
 662                                                                                                                 }
 663                                                                                                                 for resp in resps.update_fail_htlcs {
 664                                                                                                                         encode_and_send_msg!(resp, 131);
 665                                                                                                                 }
 666                                                                                                                 encode_and_send_msg!(resps.commitment_signed, 132);
 667                                                                                                         },
 668                                                                                                         None => {},
 669                                                                                                 }
 670                                                                                         },
 671
 672                                                                                         // Routing control:
 673                                                                                         259 => {
 674                                                                                                 let msg = try_potential_decodeerror!(msgs::AnnouncementSignatures::read(&mut reader));
 675                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg));
 676                                                                                         },
 677                                                                                         256 => {
 678                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelAnnouncement::read(&mut reader));
 679                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
 680
 681                                                                                                 if should_forward {
 682                                                                                                         // TODO: forward msg along to all our other peers!
 683                                                                                                 }
 684                                                                                         },
 685                                                                                         257 => {
 686                                                                                                 let msg = try_potential_decodeerror!(msgs::NodeAnnouncement::read(&mut reader));
 687                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
 688
 689                                                                                                 if should_forward {
 690                                                                                                         // TODO: forward msg along to all our other peers!
 691                                                                                                 }
 692                                                                                         },
 693                                                                                         258 => {
 694                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelUpdate::read(&mut reader));
 695                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
 696
 697                                                                                                 if should_forward {
 698                                                                                                         // TODO: forward msg along to all our other peers!
 699                                                                                                 }
 700                                                                                         },
 701                                                                                         _ => {
 702                                                                                                 if (msg_type & 1) == 0 {
 703                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 704                                                                                                 }
 705                                                                                         },
 706                                                                                 }
 707                                                                         }
 708                                                                 }
 709                                                         }
 710                                                 }
 711                                         }
 712
 713                                         Self::do_attempt_write_data(peer_descriptor, peer);
 714
 715                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 716                                 }
 717                         };
 718
 719                         pause_read
 720                 };
 721
 722                 self.process_events();
 723
 724                 Ok(pause_read)
 725         }
 726
 727         /// Checks for any events generated by our handlers and processes them. May be needed after eg
 728         /// calls to ChannelManager::process_pending_htlc_forward.
 729         pub fn process_events(&self) {
 730                 let mut upstream_events = Vec::new();
 731                 {
 732                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 733                         // buffer by doing things like announcing channels on another node. We should be willing to
 734                         // drop optional-ish messages when send buffers get full!
 735
 736                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_events();
 737                         let mut peers = self.peers.lock().unwrap();
 738                         for event in events_generated.drain(..) {
 739                                 macro_rules! get_peer_for_forwarding {
 740                                         ($node_id: expr, $handle_no_such_peer: block) => {
 741                                                 {
 742                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 743                                                                 Some(descriptor) => descriptor.clone(),
 744                                                                 None => {
 745                                                                         $handle_no_such_peer;
 746                                                                         continue;
 747                                                                 },
 748                                                         };
 749                                                         match peers.peers.get_mut(&descriptor) {
 750                                                                 Some(peer) => {
 751                                                                         if peer.their_global_features.is_none() {
 752                                                                                 $handle_no_such_peer;
 753                                                                                 continue;
 754                                                                         }
 755                                                                         (descriptor, peer)
 756                                                                 },
 757                                                                 None => panic!("Inconsistent peers set state!"),
 758                                                         }
 759                                                 }
 760                                         }
 761                                 }
 762                                 match event {
 763                                         Event::FundingGenerationReady {..} => { /* Hand upstream */ },
 764                                         Event::FundingBroadcastSafe {..} => { /* Hand upstream */ },
 765                                         Event::PaymentReceived {..} => { /* Hand upstream */ },
 766                                         Event::PaymentSent {..} => { /* Hand upstream */ },
 767                                         Event::PaymentFailed {..} => { /* Hand upstream */ },
 768                                         Event::PendingHTLCsForwardable {..} => { /* Hand upstream */ },
 769
 770                                         Event::SendOpenChannel { ref node_id, ref msg } => {
 771                                                 log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
 772                                                                 log_pubkey!(node_id),
 773                                                                 log_bytes!(msg.temporary_channel_id));
 774                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 775                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 776                                                         });
 777                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 32)));
 778                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 779                                                 continue;
 780                                         },
 781                                         Event::SendFundingCreated { ref node_id, ref msg } => {
 782                                                 log_trace!(self, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
 783                                                                 log_pubkey!(node_id),
 784                                                                 log_bytes!(msg.temporary_channel_id),
 785                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
 786                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 787                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 788                                                                 //they should just throw away this funding transaction
 789                                                         });
 790                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 34)));
 791                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 792                                                 continue;
 793                                         },
 794                                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
 795                                                 log_trace!(self, "Handling SendFundingLocked event in peer_handler for node {}{} for channel {}",
 796                                                                 log_pubkey!(node_id),
 797                                                                 if announcement_sigs.is_some() { " with announcement sigs" } else { "" },
 798                                                                 log_bytes!(msg.channel_id));
 799                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 800                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 801                                                         });
 802                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 36)));
 803                                                 match announcement_sigs {
 804                                                         &Some(ref announce_msg) => peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(announce_msg, 259))),
 805                                                         &None => {},
 806                                                 }
 807                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 808                                                 continue;
 809                                         },
 810                                         Event::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 commitment_signed } } => {
 811                                                 log_trace!(self, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
 812                                                                 log_pubkey!(node_id),
 813                                                                 update_add_htlcs.len(),
 814                                                                 update_fulfill_htlcs.len(),
 815                                                                 update_fail_htlcs.len(),
 816                                                                 log_bytes!(commitment_signed.channel_id));
 817                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 818                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 819                                                         });
 820                                                 for msg in update_add_htlcs {
 821                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 128)));
 822                                                 }
 823                                                 for msg in update_fulfill_htlcs {
 824                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 130)));
 825                                                 }
 826                                                 for msg in update_fail_htlcs {
 827                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 131)));
 828                                                 }
 829                                                 for msg in update_fail_malformed_htlcs {
 830                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 135)));
 831                                                 }
 832                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed, 132)));
 833                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 834                                                 continue;
 835                                         },
 836                                         Event::SendShutdown { ref node_id, ref msg } => {
 837                                                 log_trace!(self, "Handling Shutdown event in peer_handler for node {} for channel {}",
 838                                                                 log_pubkey!(node_id),
 839                                                                 log_bytes!(msg.channel_id));
 840                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 841                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 842                                                         });
 843                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 38)));
 844                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 845                                                 continue;
 846                                         },
 847                                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
 848                                                 log_trace!(self, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 849                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
 850                                                         let encoded_msg = encode_msg!(msg, 256);
 851                                                         let encoded_update_msg = encode_msg!(update_msg, 258);
 852
 853                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 854                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
 855                                                                         continue
 856                                                                 }
 857                                                                 match peer.their_node_id {
 858                                                                         None => continue,
 859                                                                         Some(their_node_id) => {
 860                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
 861                                                                                         continue
 862                                                                                 }
 863                                                                         }
 864                                                                 }
 865                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 866                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
 867                                                                 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
 868                                                         }
 869                                                 }
 870                                                 continue;
 871                                         },
 872                                         Event::BroadcastChannelUpdate { ref msg } => {
 873                                                 log_trace!(self, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 874                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
 875                                                         let encoded_msg = encode_msg!(msg, 258);
 876
 877                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 878                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
 879                                                                         continue
 880                                                                 }
 881                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 882                                                                 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
 883                                                         }
 884                                                 }
 885                                                 continue;
 886                                         },
 887                                         Event::HandleError { ref node_id, ref action } => {
 888                                                 if let Some(ref action) = *action {
 889                                                         match *action {
 890                                                                 msgs::ErrorAction::DisconnectPeer { ref msg } => {
 891                                                                         if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
 892                                                                                 if let Some(mut peer) = peers.peers.remove(&descriptor) {
 893                                                                                         if let Some(ref msg) = *msg {
 894                                                                                                 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
 895                                                                                                                 log_pubkey!(node_id),
 896                                                                                                                 msg.data);
 897                                                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
 898                                                                                                 // This isn't guaranteed to work, but if there is enough free
 899                                                                                                 // room in the send buffer, put the error message there...
 900                                                                                                 Self::do_attempt_write_data(&mut descriptor, &mut peer);
 901                                                                                         } else {
 902                                                                                                 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
 903                                                                                         }
 904                                                                                 }
 905                                                                                 descriptor.disconnect_socket();
 906                                                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
 907                                                                         }
 908                                                                 },
 909                                                                 msgs::ErrorAction::IgnoreError => {
 910                                                                         continue;
 911                                                                 },
 912                                                                 msgs::ErrorAction::SendErrorMessage { ref msg } => {
 913                                                                         log_trace!(self, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
 914                                                                                         log_pubkey!(node_id),
 915                                                                                         msg.data);
 916                                                                         let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 917                                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 918                                                                         });
 919                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
 920                                                                         Self::do_attempt_write_data(&mut descriptor, peer);
 921                                                                 },
 922                                                         }
 923                                                 } else {
 924                                                         log_error!(self, "Got no-action HandleError Event in peer_handler for node {}, no such events should ever be generated!", log_pubkey!(node_id));
 925                                                 }
 926                                                 continue;
 927                                         }
 928                                 }
 929
 930                                 upstream_events.push(event);
 931                         }
 932                 }
 933
 934                 let mut pending_events = self.pending_events.lock().unwrap();
 935                 for event in upstream_events.drain(..) {
 936                         pending_events.push(event);
 937                 }
 938         }
 939
 940         /// Indicates that the given socket descriptor's connection is now closed.
 941         /// This must be called even if a PeerHandleError was given for a read_event or write_event,
 942         /// but must NOT be called if a PeerHandleError was provided out of a new_*_connection event!
 943         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
 944         pub fn disconnect_event(&self, descriptor: &Descriptor) {
 945                 self.disconnect_event_internal(descriptor, false);
 946         }
 947
 948         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
 949                 let mut peers = self.peers.lock().unwrap();
 950                 let peer_option = peers.peers.remove(descriptor);
 951                 match peer_option {
 952                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
 953                         Some(peer) => {
 954                                 match peer.their_node_id {
 955                                         Some(node_id) => {
 956                                                 peers.node_id_to_descriptor.remove(&node_id);
 957                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
 958                                         },
 959                                         None => {}
 960                                 }
 961                         }
 962                 };
 963         }
 964 }
 965
 966 impl<Descriptor: SocketDescriptor> EventsProvider for PeerManager<Descriptor> {
 967         fn get_and_clear_pending_events(&self) -> Vec<Event> {
 968                 let mut pending_events = self.pending_events.lock().unwrap();
 969                 let mut ret = Vec::new();
 970                 mem::swap(&mut ret, &mut *pending_events);
 971                 ret
 972         }
 973 }
 974
 975 #[cfg(test)]
 976 mod tests {
 977         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
 978         use ln::msgs;
 979         use util::events;
 980         use util::test_utils;
 981         use util::logger::Logger;
 982
 983         use secp256k1::Secp256k1;
 984         use secp256k1::key::{SecretKey, PublicKey};
 985
 986         use rand::{thread_rng, Rng};
 987
 988         use std::sync::{Arc};
 989
 990         #[derive(PartialEq, Eq, Clone, Hash)]
 991         struct FileDescriptor {
 992                 fd: u16,
 993         }
 994
 995         impl SocketDescriptor for FileDescriptor {
 996                 fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, _resume_read: bool) -> usize {
 997                         assert!(write_offset < data.len());
 998                         data.len() - write_offset
 999                 }
1000
1001                 fn disconnect_socket(&mut self) {}
1002         }
1003
1004         fn create_network(peer_count: usize) -> Vec<PeerManager<FileDescriptor>> {
1005                 let secp_ctx = Secp256k1::new();
1006                 let mut peers = Vec::new();
1007                 let mut rng = thread_rng();
1008                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
1009
1010                 for _ in 0..peer_count {
1011                         let chan_handler = test_utils::TestChannelMessageHandler::new();
1012                         let router = test_utils::TestRoutingMessageHandler::new();
1013                         let node_id = {
1014                                 let mut key_slice = [0;32];
1015                                 rng.fill_bytes(&mut key_slice);
1016                                 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1017                         };
1018                         let msg_handler = MessageHandler { chan_handler: Arc::new(chan_handler), route_handler: Arc::new(router) };
1019                         let peer = PeerManager::new(msg_handler, node_id, Arc::clone(&logger));
1020                         peers.push(peer);
1021                 }
1022
1023                 peers
1024         }
1025
1026         fn establish_connection(peer_a: &PeerManager<FileDescriptor>, peer_b: &PeerManager<FileDescriptor>) {
1027                 let secp_ctx = Secp256k1::new();
1028                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peer_b.our_node_secret);
1029                 let fd = FileDescriptor { fd: 1};
1030                 peer_a.new_inbound_connection(fd.clone()).unwrap();
1031                 peer_a.peers.lock().unwrap().node_id_to_descriptor.insert(their_id, fd.clone());
1032         }
1033
1034         #[test]
1035         fn test_disconnect_peer() {
1036                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1037                 // push an DisconnectPeer event to remove the node flagged by id
1038                 let mut peers = create_network(2);
1039                 establish_connection(&peers[0], &peers[1]);
1040                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1041
1042                 let secp_ctx = Secp256k1::new();
1043                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1044
1045                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1046                 chan_handler.pending_events.lock().unwrap().push(events::Event::HandleError {
1047                         node_id: their_id,
1048                         action: Some(msgs::ErrorAction::DisconnectPeer { msg: None }),
1049                 });
1050                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1051                 peers[0].message_handler.chan_handler = Arc::new(chan_handler);
1052
1053                 peers[0].process_events();
1054                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1055         }
1056 }