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

   1 //! Top level peer message handling and socket handling logic lives here.
   2 //!
   3 //! Instead of actually servicing sockets ourselves we require that you implement the
   4 //! SocketDescriptor interface and use that to receive actions which you should perform on the
   5 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
   6 //! call into the provided message handlers (probably a ChannelManager and Router) with messages
   7 //! they should handle, and encoding/sending response messages.
   8
   9 use secp256k1::key::{SecretKey,PublicKey};
  10
  11 use ln::msgs;
  12 use util::ser::{Writeable, Writer, Readable};
  13 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
  14 use util::byte_utils;
  15 use util::events::{MessageSendEvent};
  16 use util::logger::Logger;
  17
  18 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
  19 use std::sync::{Arc, Mutex};
  20 use std::sync::atomic::{AtomicUsize, Ordering};
  21 use std::{cmp,error,hash,fmt};
  22
  23 use bitcoin_hashes::sha256::Hash as Sha256;
  24 use bitcoin_hashes::sha256::HashEngine as Sha256Engine;
  25 use bitcoin_hashes::{HashEngine, Hash};
  26
  27 /// Provides references to trait impls which handle different types of messages.
  28 pub struct MessageHandler {
  29         /// A message handler which handles messages specific to channels. Usually this is just a
  30         /// ChannelManager object.
  31         pub chan_handler: Arc<msgs::ChannelMessageHandler>,
  32         /// A message handler which handles messages updating our knowledge of the network channel
  33         /// graph. Usually this is just a Router object.
  34         pub route_handler: Arc<msgs::RoutingMessageHandler>,
  35 }
  36
  37 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  38 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  39 /// implement Hash to meet the PeerManager API.
  40 ///
  41 /// For efficiency, Clone should be relatively cheap for this type.
  42 ///
  43 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  44 /// send_data. Note that if you are using a higher-level net library that may close() itself, be
  45 /// careful to ensure you don't have races whereby you might register a new connection with an fd
  46 /// the same as a yet-to-be-disconnect_event()-ed.
  47 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  48         /// Attempts to send some data from the given slice to the peer.
  49         ///
  50         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  51         /// Note that in the disconnected case, a disconnect_event must still fire and further write
  52         /// attempts may occur until that time.
  53         ///
  54         /// If the returned size is smaller than data.len(), a write_available event must
  55         /// trigger the next time more data can be written. Additionally, until the a send_data event
  56         /// completes fully, no further read_events should trigger on the same peer!
  57         ///
  58         /// If a read_event on this descriptor had previously returned true (indicating that read
  59         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  60         /// indicating that read events on this descriptor should resume. A resume_read of false does
  61         /// *not* imply that further read events should be paused.
  62         fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
  63         /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
  64         /// more calls to write_event, read_event or disconnect_event may be made with this descriptor.
  65         /// No disconnect_event should be generated as a result of this call, though obviously races
  66         /// may occur whereby disconnect_socket is called after a call to disconnect_event but prior to
  67         /// that event completing.
  68         fn disconnect_socket(&mut self);
  69 }
  70
  71 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  72 /// generate no further read/write_events for the descriptor, only triggering a single
  73 /// disconnect_event (unless it was provided in response to a new_*_connection event, in which case
  74 /// no such disconnect_event must be generated and the socket be silently disconencted).
  75 pub struct PeerHandleError {
  76         /// Used to indicate that we probably can't make any future connections to this peer, implying
  77         /// we should go ahead and force-close any channels we have with it.
  78         no_connection_possible: bool,
  79 }
  80 impl fmt::Debug for PeerHandleError {
  81         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  82                 formatter.write_str("Peer Sent Invalid Data")
  83         }
  84 }
  85 impl fmt::Display for PeerHandleError {
  86         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  87                 formatter.write_str("Peer Sent Invalid Data")
  88         }
  89 }
  90 impl error::Error for PeerHandleError {
  91         fn description(&self) -> &str {
  92                 "Peer Sent Invalid Data"
  93         }
  94 }
  95
  96 enum InitSyncTracker{
  97         NoSyncRequested,
  98         ChannelsSyncing(u64),
  99         NodesSyncing(PublicKey),
 100 }
 101
 102 struct Peer {
 103         channel_encryptor: PeerChannelEncryptor,
 104         outbound: bool,
 105         their_node_id: Option<PublicKey>,
 106         their_global_features: Option<msgs::GlobalFeatures>,
 107         their_local_features: Option<msgs::LocalFeatures>,
 108
 109         pending_outbound_buffer: LinkedList<Vec<u8>>,
 110         pending_outbound_buffer_first_msg_offset: usize,
 111         awaiting_write_event: bool,
 112
 113         pending_read_buffer: Vec<u8>,
 114         pending_read_buffer_pos: usize,
 115         pending_read_is_header: bool,
 116
 117         sync_status: InitSyncTracker,
 118 }
 119
 120 impl Peer {
 121         /// Returns true if the channel announcements/updates for the given channel should be
 122         /// forwarded to this peer.
 123         /// If we are sending our routing table to this peer and we have not yet sent channel
 124         /// announcements/updates for the given channel_id then we will send it when we get to that
 125         /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
 126         /// sent the old versions, we should send the update, and so return true here.
 127         fn should_forward_channel(&self, channel_id: u64)->bool{
 128                 match self.sync_status {
 129                         InitSyncTracker::NoSyncRequested => true,
 130                         InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
 131                         InitSyncTracker::NodesSyncing(_) => true,
 132                 }
 133         }
 134 }
 135
 136 struct PeerHolder<Descriptor: SocketDescriptor> {
 137         peers: HashMap<Descriptor, Peer>,
 138         /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
 139         /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
 140         peers_needing_send: HashSet<Descriptor>,
 141         /// Only add to this set when noise completes:
 142         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
 143 }
 144 struct MutPeerHolder<'a, Descriptor: SocketDescriptor + 'a> {
 145         peers: &'a mut HashMap<Descriptor, Peer>,
 146         peers_needing_send: &'a mut HashSet<Descriptor>,
 147         node_id_to_descriptor: &'a mut HashMap<PublicKey, Descriptor>,
 148 }
 149 impl<Descriptor: SocketDescriptor> PeerHolder<Descriptor> {
 150         fn borrow_parts(&mut self) -> MutPeerHolder<Descriptor> {
 151                 MutPeerHolder {
 152                         peers: &mut self.peers,
 153                         peers_needing_send: &mut self.peers_needing_send,
 154                         node_id_to_descriptor: &mut self.node_id_to_descriptor,
 155                 }
 156         }
 157 }
 158
 159 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
 160 fn _check_usize_is_32_or_64() {
 161         // See below, less than 32 bit pointers may be unsafe here!
 162         unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
 163 }
 164
 165 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
 166 /// events into messages which it passes on to its MessageHandlers.
 167 pub struct PeerManager<Descriptor: SocketDescriptor> {
 168         message_handler: MessageHandler,
 169         peers: Mutex<PeerHolder<Descriptor>>,
 170         our_node_secret: SecretKey,
 171         ephemeral_key_midstate: Sha256Engine,
 172
 173         // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
 174         // bits we will never realistically count into high:
 175         peer_counter_low: AtomicUsize,
 176         peer_counter_high: AtomicUsize,
 177
 178         initial_syncs_sent: AtomicUsize,
 179         logger: Arc<Logger>,
 180 }
 181
 182 struct VecWriter(Vec<u8>);
 183 impl Writer for VecWriter {
 184         fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
 185                 self.0.extend_from_slice(buf);
 186                 Ok(())
 187         }
 188         fn size_hint(&mut self, size: usize) {
 189                 self.0.reserve_exact(size);
 190         }
 191 }
 192
 193 macro_rules! encode_msg {
 194         ($msg: expr, $msg_code: expr) => {{
 195                 let mut msg = VecWriter(Vec::new());
 196                 ($msg_code as u16).write(&mut msg).unwrap();
 197                 $msg.write(&mut msg).unwrap();
 198                 msg.0
 199         }}
 200 }
 201
 202 //TODO: Really should do something smarter for this
 203 const INITIAL_SYNCS_TO_SEND: usize = 5;
 204
 205 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 206 /// PeerIds may repeat, but only after disconnect_event() has been called.
 207 impl<Descriptor: SocketDescriptor> PeerManager<Descriptor> {
 208         /// Constructs a new PeerManager with the given message handlers and node_id secret key
 209         /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
 210         /// cryptographically secure random bytes.
 211         pub fn new(message_handler: MessageHandler, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: Arc<Logger>) -> PeerManager<Descriptor> {
 212                 let mut ephemeral_key_midstate = Sha256::engine();
 213                 ephemeral_key_midstate.input(ephemeral_random_data);
 214
 215                 PeerManager {
 216                         message_handler: message_handler,
 217                         peers: Mutex::new(PeerHolder {
 218                                 peers: HashMap::new(),
 219                                 peers_needing_send: HashSet::new(),
 220                                 node_id_to_descriptor: HashMap::new()
 221                         }),
 222                         our_node_secret: our_node_secret,
 223                         ephemeral_key_midstate,
 224                         peer_counter_low: AtomicUsize::new(0),
 225                         peer_counter_high: AtomicUsize::new(0),
 226                         initial_syncs_sent: AtomicUsize::new(0),
 227                         logger,
 228                 }
 229         }
 230
 231         /// Get the list of node ids for peers which have completed the initial handshake.
 232         ///
 233         /// For outbound connections, this will be the same as the their_node_id parameter passed in to
 234         /// new_outbound_connection, however entries will only appear once the initial handshake has
 235         /// completed and we are sure the remote peer has the private key for the given node_id.
 236         pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
 237                 let peers = self.peers.lock().unwrap();
 238                 peers.peers.values().filter_map(|p| {
 239                         if !p.channel_encryptor.is_ready_for_encryption() || p.their_global_features.is_none() {
 240                                 return None;
 241                         }
 242                         p.their_node_id
 243                 }).collect()
 244         }
 245
 246         fn get_ephemeral_key(&self) -> SecretKey {
 247                 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
 248                 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
 249                 let high = if low == 0 {
 250                         self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
 251                 } else {
 252                         self.peer_counter_high.load(Ordering::Acquire)
 253                 };
 254                 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
 255                 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
 256                 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
 257         }
 258
 259         /// Indicates a new outbound connection has been established to a node with the given node_id.
 260         /// Note that if an Err is returned here you MUST NOT call disconnect_event for the new
 261         /// descriptor but must disconnect the connection immediately.
 262         ///
 263         /// Returns a small number of bytes to send to the remote node (currently always 50).
 264         ///
 265         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 266         /// disconnect_event.
 267         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 268                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
 269                 let res = peer_encryptor.get_act_one().to_vec();
 270                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 271
 272                 let mut peers = self.peers.lock().unwrap();
 273                 if peers.peers.insert(descriptor, Peer {
 274                         channel_encryptor: peer_encryptor,
 275                         outbound: true,
 276                         their_node_id: None,
 277                         their_global_features: None,
 278                         their_local_features: None,
 279
 280                         pending_outbound_buffer: LinkedList::new(),
 281                         pending_outbound_buffer_first_msg_offset: 0,
 282                         awaiting_write_event: false,
 283
 284                         pending_read_buffer: pending_read_buffer,
 285                         pending_read_buffer_pos: 0,
 286                         pending_read_is_header: false,
 287
 288                         sync_status: InitSyncTracker::NoSyncRequested,
 289                 }).is_some() {
 290                         panic!("PeerManager driver duplicated descriptors!");
 291                 };
 292                 Ok(res)
 293         }
 294
 295         /// Indicates a new inbound connection has been established.
 296         ///
 297         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 298         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 299         /// call disconnect_event for the new descriptor but must disconnect the connection
 300         /// immediately.
 301         ///
 302         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 303         /// disconnect_event.
 304         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 305                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 306                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 307
 308                 let mut peers = self.peers.lock().unwrap();
 309                 if peers.peers.insert(descriptor, Peer {
 310                         channel_encryptor: peer_encryptor,
 311                         outbound: false,
 312                         their_node_id: None,
 313                         their_global_features: None,
 314                         their_local_features: None,
 315
 316                         pending_outbound_buffer: LinkedList::new(),
 317                         pending_outbound_buffer_first_msg_offset: 0,
 318                         awaiting_write_event: false,
 319
 320                         pending_read_buffer: pending_read_buffer,
 321                         pending_read_buffer_pos: 0,
 322                         pending_read_is_header: false,
 323
 324                         sync_status: InitSyncTracker::NoSyncRequested,
 325                 }).is_some() {
 326                         panic!("PeerManager driver duplicated descriptors!");
 327                 };
 328                 Ok(())
 329         }
 330
 331         fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
 332                 macro_rules! encode_and_send_msg {
 333                         ($msg: expr, $msg_code: expr) => {
 334                                 {
 335                                         log_trace!(self, "Encoding and sending sync update message of type {} to {}", $msg_code, log_pubkey!(peer.their_node_id.unwrap()));
 336                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
 337                                 }
 338                         }
 339                 }
 340                 const MSG_BUFF_SIZE: usize = 10;
 341                 while !peer.awaiting_write_event {
 342                         if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
 343                                 match peer.sync_status {
 344                                         InitSyncTracker::NoSyncRequested => {},
 345                                         InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
 346                                                 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
 347                                                 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(0, steps);
 348                                                 for &(ref announce, ref update_a, ref update_b) in all_messages.iter() {
 349                                                         encode_and_send_msg!(announce, 256);
 350                                                         encode_and_send_msg!(update_a, 258);
 351                                                         encode_and_send_msg!(update_b, 258);
 352                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
 353                                                 }
 354                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 355                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
 356                                                 }
 357                                         },
 358                                         InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
 359                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 360                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
 361                                                 for msg in all_messages.iter() {
 362                                                         encode_and_send_msg!(msg, 256);
 363                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 364                                                 }
 365                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 366                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 367                                                 }
 368                                         },
 369                                         InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
 370                                         InitSyncTracker::NodesSyncing(key) => {
 371                                                 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
 372                                                 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
 373                                                 for msg in all_messages.iter() {
 374                                                         encode_and_send_msg!(msg, 256);
 375                                                         peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
 376                                                 }
 377                                                 if all_messages.is_empty() || all_messages.len() != steps as usize {
 378                                                         peer.sync_status = InitSyncTracker::NoSyncRequested;
 379                                                 }
 380                                         },
 381                                 }
 382                         }
 383
 384                         if {
 385                                 let next_buff = match peer.pending_outbound_buffer.front() {
 386                                         None => return,
 387                                         Some(buff) => buff,
 388                                 };
 389
 390                                 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
 391                                 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
 392                                 let data_sent = descriptor.send_data(pending, should_be_reading);
 393                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 394                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 395                         } {
 396                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 397                                 peer.pending_outbound_buffer.pop_front();
 398                         } else {
 399                                 peer.awaiting_write_event = true;
 400                         }
 401                 }
 402         }
 403
 404         /// Indicates that there is room to write data to the given socket descriptor.
 405         ///
 406         /// May return an Err to indicate that the connection should be closed.
 407         ///
 408         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 409         /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
 410         /// invariants around calling write_event in case a write did not fully complete must still
 411         /// hold - be ready to call write_event again if a write call generated here isn't sufficient!
 412         /// Panics if the descriptor was not previously registered in a new_\*_connection event.
 413         pub fn write_event(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 414                 let mut peers = self.peers.lock().unwrap();
 415                 match peers.peers.get_mut(descriptor) {
 416                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 417                         Some(peer) => {
 418                                 peer.awaiting_write_event = false;
 419                                 self.do_attempt_write_data(descriptor, peer);
 420                         }
 421                 };
 422                 Ok(())
 423         }
 424
 425         /// Indicates that data was read from the given socket descriptor.
 426         ///
 427         /// May return an Err to indicate that the connection should be closed.
 428         ///
 429         /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
 430         /// Thus, however, you almost certainly want to call process_events() after any read_event to
 431         /// generate send_data calls to handle responses.
 432         ///
 433         /// If Ok(true) is returned, further read_events should not be triggered until a write_event on
 434         /// this file descriptor has resume_read set (preventing DoS issues in the send buffer).
 435         ///
 436         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 437         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 438                 match self.do_read_event(peer_descriptor, data) {
 439                         Ok(res) => Ok(res),
 440                         Err(e) => {
 441                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 442                                 Err(e)
 443                         }
 444                 }
 445         }
 446
 447         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 448                 let pause_read = {
 449                         let mut peers_lock = self.peers.lock().unwrap();
 450                         let peers = peers_lock.borrow_parts();
 451                         let pause_read = match peers.peers.get_mut(peer_descriptor) {
 452                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 453                                 Some(peer) => {
 454                                         assert!(peer.pending_read_buffer.len() > 0);
 455                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 456
 457                                         let mut read_pos = 0;
 458                                         while read_pos < data.len() {
 459                                                 {
 460                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 461                                                         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]);
 462                                                         read_pos += data_to_copy;
 463                                                         peer.pending_read_buffer_pos += data_to_copy;
 464                                                 }
 465
 466                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 467                                                         peer.pending_read_buffer_pos = 0;
 468
 469                                                         macro_rules! encode_and_send_msg {
 470                                                                 ($msg: expr, $msg_code: expr) => {
 471                                                                         {
 472                                                                                 log_trace!(self, "Encoding and sending message of type {} to {}", $msg_code, log_pubkey!(peer.their_node_id.unwrap()));
 473                                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
 474                                                                                 peers.peers_needing_send.insert(peer_descriptor.clone());
 475                                                                         }
 476                                                                 }
 477                                                         }
 478
 479                                                         macro_rules! try_potential_handleerror {
 480                                                                 ($thing: expr) => {
 481                                                                         match $thing {
 482                                                                                 Ok(x) => x,
 483                                                                                 Err(e) => {
 484                                                                                         match e.action {
 485                                                                                                 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
 486                                                                                                         //TODO: Try to push msg
 487                                                                                                         log_trace!(self, "Got Err handling message, disconnecting peer because {}", e.err);
 488                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 489                                                                                                 },
 490                                                                                                 msgs::ErrorAction::IgnoreError => {
 491                                                                                                         log_trace!(self, "Got Err handling message, ignoring because {}", e.err);
 492                                                                                                         continue;
 493                                                                                                 },
 494                                                                                                 msgs::ErrorAction::SendErrorMessage { msg } => {
 495                                                                                                         log_trace!(self, "Got Err handling message, sending Error message because {}", e.err);
 496                                                                                                         encode_and_send_msg!(msg, 17);
 497                                                                                                         continue;
 498                                                                                                 },
 499                                                                                         }
 500                                                                                 }
 501                                                                         };
 502                                                                 }
 503                                                         }
 504
 505                                                         macro_rules! try_potential_decodeerror {
 506                                                                 ($thing: expr) => {
 507                                                                         match $thing {
 508                                                                                 Ok(x) => x,
 509                                                                                 Err(e) => {
 510                                                                                         match e {
 511                                                                                                 msgs::DecodeError::UnknownVersion => return Err(PeerHandleError{ no_connection_possible: false }),
 512                                                                                                 msgs::DecodeError::UnknownRequiredFeature => {
 513                                                                                                         log_debug!(self, "Got a channel/node announcement with an known required feature flag, you may want to update!");
 514                                                                                                         continue;
 515                                                                                                 },
 516                                                                                                 msgs::DecodeError::InvalidValue => {
 517                                                                                                         log_debug!(self, "Got an invalid value while deserializing message");
 518                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 519                                                                                                 },
 520                                                                                                 msgs::DecodeError::ShortRead => {
 521                                                                                                         log_debug!(self, "Deserialization failed due to shortness of message");
 522                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 523                                                                                                 },
 524                                                                                                 msgs::DecodeError::ExtraAddressesPerType => {
 525                                                                                                         log_debug!(self, "Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
 526                                                                                                         continue;
 527                                                                                                 },
 528                                                                                                 msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError{ no_connection_possible: false }),
 529                                                                                                 msgs::DecodeError::Io(_) => return Err(PeerHandleError{ no_connection_possible: false }),
 530                                                                                         }
 531                                                                                 }
 532                                                                         };
 533                                                                 }
 534                                                         }
 535
 536                                                         macro_rules! insert_node_id {
 537                                                                 () => {
 538                                                                         match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
 539                                                                                 hash_map::Entry::Occupied(_) => {
 540                                                                                         log_trace!(self, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
 541                                                                                         peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
 542                                                                                         return Err(PeerHandleError{ no_connection_possible: false })
 543                                                                                 },
 544                                                                                 hash_map::Entry::Vacant(entry) => {
 545                                                                                         log_trace!(self, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
 546                                                                                         entry.insert(peer_descriptor.clone())
 547                                                                                 },
 548                                                                         };
 549                                                                 }
 550                                                         }
 551
 552                                                         let next_step = peer.channel_encryptor.get_noise_step();
 553                                                         match next_step {
 554                                                                 NextNoiseStep::ActOne => {
 555                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
 556                                                                         peer.pending_outbound_buffer.push_back(act_two);
 557                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 558                                                                 },
 559                                                                 NextNoiseStep::ActTwo => {
 560                                                                         let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
 561                                                                         peer.pending_outbound_buffer.push_back(act_three.to_vec());
 562                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 563                                                                         peer.pending_read_is_header = true;
 564
 565                                                                         peer.their_node_id = Some(their_node_id);
 566                                                                         insert_node_id!();
 567                                                                         let mut local_features = msgs::LocalFeatures::new();
 568                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 569                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 570                                                                                 local_features.set_initial_routing_sync();
 571                                                                         }
 572                                                                         encode_and_send_msg!(msgs::Init {
 573                                                                                 global_features: msgs::GlobalFeatures::new(),
 574                                                                                 local_features,
 575                                                                         }, 16);
 576                                                                 },
 577                                                                 NextNoiseStep::ActThree => {
 578                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 579                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 580                                                                         peer.pending_read_is_header = true;
 581                                                                         peer.their_node_id = Some(their_node_id);
 582                                                                         insert_node_id!();
 583                                                                 },
 584                                                                 NextNoiseStep::NoiseComplete => {
 585                                                                         if peer.pending_read_is_header {
 586                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 587                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 588                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 589                                                                                 if msg_len < 2 { // Need at least the message type tag
 590                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 591                                                                                 }
 592                                                                                 peer.pending_read_is_header = false;
 593                                                                         } else {
 594                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 595                                                                                 assert!(msg_data.len() >= 2);
 596
 597                                                                                 // Reset read buffer
 598                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 599                                                                                 peer.pending_read_is_header = true;
 600
 601                                                                                 let msg_type = byte_utils::slice_to_be16(&msg_data[0..2]);
 602                                                                                 log_trace!(self, "Received message of type {} from {}", msg_type, log_pubkey!(peer.their_node_id.unwrap()));
 603                                                                                 if msg_type != 16 && peer.their_global_features.is_none() {
 604                                                                                         // Need an init message as first message
 605                                                                                         log_trace!(self, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
 606                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 607                                                                                 }
 608                                                                                 let mut reader = ::std::io::Cursor::new(&msg_data[2..]);
 609                                                                                 match msg_type {
 610                                                                                         // Connection control:
 611                                                                                         16 => {
 612                                                                                                 let msg = try_potential_decodeerror!(msgs::Init::read(&mut reader));
 613                                                                                                 if msg.global_features.requires_unknown_bits() {
 614                                                                                                         log_info!(self, "Peer global features required unknown version bits");
 615                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 616                                                                                                 }
 617                                                                                                 if msg.local_features.requires_unknown_bits() {
 618                                                                                                         log_info!(self, "Peer local features required unknown version bits");
 619                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 620                                                                                                 }
 621                                                                                                 if peer.their_global_features.is_some() {
 622                                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 623                                                                                                 }
 624
 625                                                                                                 log_info!(self, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, unkown local flags: {}, unknown global flags: {}",
 626                                                                                                         if msg.local_features.supports_data_loss_protect() { "supported" } else { "not supported"},
 627                                                                                                         if msg.local_features.initial_routing_sync() { "requested" } else { "not requested" },
 628                                                                                                         if msg.local_features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
 629                                                                                                         if msg.local_features.supports_unknown_bits() { "present" } else { "none" },
 630                                                                                                         if msg.global_features.supports_unknown_bits() { "present" } else { "none" });
 631
 632                                                                                                 if msg.local_features.initial_routing_sync() {
 633                                                                                                         peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
 634                                                                                                         peers.peers_needing_send.insert(peer_descriptor.clone());
 635                                                                                                 }
 636                                                                                                 peer.their_global_features = Some(msg.global_features);
 637                                                                                                 peer.their_local_features = Some(msg.local_features);
 638
 639                                                                                                 if !peer.outbound {
 640                                                                                                         let mut local_features = msgs::LocalFeatures::new();
 641                                                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 642                                                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 643                                                                                                                 local_features.set_initial_routing_sync();
 644                                                                                                         }
 645
 646                                                                                                         encode_and_send_msg!(msgs::Init {
 647                                                                                                                 global_features: msgs::GlobalFeatures::new(),
 648                                                                                                                 local_features,
 649                                                                                                         }, 16);
 650                                                                                                 }
 651
 652                                                                                                 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap());
 653                                                                                         },
 654                                                                                         17 => {
 655                                                                                                 let msg = try_potential_decodeerror!(msgs::ErrorMessage::read(&mut reader));
 656                                                                                                 let mut data_is_printable = true;
 657                                                                                                 for b in msg.data.bytes() {
 658                                                                                                         if b < 32 || b > 126 {
 659                                                                                                                 data_is_printable = false;
 660                                                                                                                 break;
 661                                                                                                         }
 662                                                                                                 }
 663
 664                                                                                                 if data_is_printable {
 665                                                                                                         log_debug!(self, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
 666                                                                                                 } else {
 667                                                                                                         log_debug!(self, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
 668                                                                                                 }
 669                                                                                                 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
 670                                                                                                 if msg.channel_id == [0; 32] {
 671                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 672                                                                                                 }
 673                                                                                         },
 674
 675                                                                                         18 => {
 676                                                                                                 let msg = try_potential_decodeerror!(msgs::Ping::read(&mut reader));
 677                                                                                                 if msg.ponglen < 65532 {
 678                                                                                                         let resp = msgs::Pong { byteslen: msg.ponglen };
 679                                                                                                         encode_and_send_msg!(resp, 19);
 680                                                                                                 }
 681                                                                                         },
 682                                                                                         19 => {
 683                                                                                                 try_potential_decodeerror!(msgs::Pong::read(&mut reader));
 684                                                                                         },
 685
 686                                                                                         // Channel control:
 687                                                                                         32 => {
 688                                                                                                 let msg = try_potential_decodeerror!(msgs::OpenChannel::read(&mut reader));
 689                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_local_features.clone().unwrap(), &msg));
 690                                                                                         },
 691                                                                                         33 => {
 692                                                                                                 let msg = try_potential_decodeerror!(msgs::AcceptChannel::read(&mut reader));
 693                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_local_features.clone().unwrap(), &msg));
 694                                                                                         },
 695
 696                                                                                         34 => {
 697                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingCreated::read(&mut reader));
 698                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg));
 699                                                                                         },
 700                                                                                         35 => {
 701                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingSigned::read(&mut reader));
 702                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg));
 703                                                                                         },
 704                                                                                         36 => {
 705                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingLocked::read(&mut reader));
 706                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg));
 707                                                                                         },
 708
 709                                                                                         38 => {
 710                                                                                                 let msg = try_potential_decodeerror!(msgs::Shutdown::read(&mut reader));
 711                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg));
 712                                                                                         },
 713                                                                                         39 => {
 714                                                                                                 let msg = try_potential_decodeerror!(msgs::ClosingSigned::read(&mut reader));
 715                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg));
 716                                                                                         },
 717
 718                                                                                         128 => {
 719                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateAddHTLC::read(&mut reader));
 720                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg));
 721                                                                                         },
 722                                                                                         130 => {
 723                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFulfillHTLC::read(&mut reader));
 724                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg));
 725                                                                                         },
 726                                                                                         131 => {
 727                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailHTLC::read(&mut reader));
 728                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg));
 729                                                                                         },
 730                                                                                         135 => {
 731                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailMalformedHTLC::read(&mut reader));
 732                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg));
 733                                                                                         },
 734
 735                                                                                         132 => {
 736                                                                                                 let msg = try_potential_decodeerror!(msgs::CommitmentSigned::read(&mut reader));
 737                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg));
 738                                                                                         },
 739                                                                                         133 => {
 740                                                                                                 let msg = try_potential_decodeerror!(msgs::RevokeAndACK::read(&mut reader));
 741                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg));
 742                                                                                         },
 743                                                                                         134 => {
 744                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFee::read(&mut reader));
 745                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg));
 746                                                                                         },
 747                                                                                         136 => {
 748                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelReestablish::read(&mut reader));
 749                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg));
 750                                                                                         },
 751
 752                                                                                         // Routing control:
 753                                                                                         259 => {
 754                                                                                                 let msg = try_potential_decodeerror!(msgs::AnnouncementSignatures::read(&mut reader));
 755                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg));
 756                                                                                         },
 757                                                                                         256 => {
 758                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelAnnouncement::read(&mut reader));
 759                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
 760
 761                                                                                                 if should_forward {
 762                                                                                                         // TODO: forward msg along to all our other peers!
 763                                                                                                 }
 764                                                                                         },
 765                                                                                         257 => {
 766                                                                                                 let msg = try_potential_decodeerror!(msgs::NodeAnnouncement::read(&mut reader));
 767                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
 768
 769                                                                                                 if should_forward {
 770                                                                                                         // TODO: forward msg along to all our other peers!
 771                                                                                                 }
 772                                                                                         },
 773                                                                                         258 => {
 774                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelUpdate::read(&mut reader));
 775                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
 776
 777                                                                                                 if should_forward {
 778                                                                                                         // TODO: forward msg along to all our other peers!
 779                                                                                                 }
 780                                                                                         },
 781                                                                                         _ => {
 782                                                                                                 if (msg_type & 1) == 0 {
 783                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 784                                                                                                 }
 785                                                                                         },
 786                                                                                 }
 787                                                                         }
 788                                                                 }
 789                                                         }
 790                                                 }
 791                                         }
 792
 793                                         self.do_attempt_write_data(peer_descriptor, peer);
 794
 795                                         peer.pending_outbound_buffer.len() > 10 // pause_read
 796                                 }
 797                         };
 798
 799                         pause_read
 800                 };
 801
 802                 Ok(pause_read)
 803         }
 804
 805         /// Checks for any events generated by our handlers and processes them. Includes sending most
 806         /// response messages as well as messages generated by calls to handler functions directly (eg
 807         /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
 808         pub fn process_events(&self) {
 809                 {
 810                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 811                         // buffer by doing things like announcing channels on another node. We should be willing to
 812                         // drop optional-ish messages when send buffers get full!
 813
 814                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
 815                         let mut peers_lock = self.peers.lock().unwrap();
 816                         let peers = peers_lock.borrow_parts();
 817                         for event in events_generated.drain(..) {
 818                                 macro_rules! get_peer_for_forwarding {
 819                                         ($node_id: expr, $handle_no_such_peer: block) => {
 820                                                 {
 821                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 822                                                                 Some(descriptor) => descriptor.clone(),
 823                                                                 None => {
 824                                                                         $handle_no_such_peer;
 825                                                                         continue;
 826                                                                 },
 827                                                         };
 828                                                         match peers.peers.get_mut(&descriptor) {
 829                                                                 Some(peer) => {
 830                                                                         if peer.their_global_features.is_none() {
 831                                                                                 $handle_no_such_peer;
 832                                                                                 continue;
 833                                                                         }
 834                                                                         (descriptor, peer)
 835                                                                 },
 836                                                                 None => panic!("Inconsistent peers set state!"),
 837                                                         }
 838                                                 }
 839                                         }
 840                                 }
 841                                 match event {
 842                                         MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
 843                                                 log_trace!(self, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
 844                                                                 log_pubkey!(node_id),
 845                                                                 log_bytes!(msg.temporary_channel_id));
 846                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 847                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 848                                                         });
 849                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 33)));
 850                                                 self.do_attempt_write_data(&mut descriptor, peer);
 851                                         },
 852                                         MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
 853                                                 log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
 854                                                                 log_pubkey!(node_id),
 855                                                                 log_bytes!(msg.temporary_channel_id));
 856                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 857                                                                 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
 858                                                         });
 859                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 32)));
 860                                                 self.do_attempt_write_data(&mut descriptor, peer);
 861                                         },
 862                                         MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
 863                                                 log_trace!(self, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
 864                                                                 log_pubkey!(node_id),
 865                                                                 log_bytes!(msg.temporary_channel_id),
 866                                                                 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
 867                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 868                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 869                                                                 //they should just throw away this funding transaction
 870                                                         });
 871                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 34)));
 872                                                 self.do_attempt_write_data(&mut descriptor, peer);
 873                                         },
 874                                         MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
 875                                                 log_trace!(self, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
 876                                                                 log_pubkey!(node_id),
 877                                                                 log_bytes!(msg.channel_id));
 878                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 879                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 880                                                                 //they should just throw away this funding transaction
 881                                                         });
 882                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 35)));
 883                                                 self.do_attempt_write_data(&mut descriptor, peer);
 884                                         },
 885                                         MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
 886                                                 log_trace!(self, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
 887                                                                 log_pubkey!(node_id),
 888                                                                 log_bytes!(msg.channel_id));
 889                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 890                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 891                                                         });
 892                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 36)));
 893                                                 self.do_attempt_write_data(&mut descriptor, peer);
 894                                         },
 895                                         MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
 896                                                 log_trace!(self, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
 897                                                                 log_pubkey!(node_id),
 898                                                                 log_bytes!(msg.channel_id));
 899                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 900                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 901                                                                 //they should just throw away this funding transaction
 902                                                         });
 903                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 259)));
 904                                                 self.do_attempt_write_data(&mut descriptor, peer);
 905                                         },
 906                                         MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
 907                                                 log_trace!(self, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
 908                                                                 log_pubkey!(node_id),
 909                                                                 update_add_htlcs.len(),
 910                                                                 update_fulfill_htlcs.len(),
 911                                                                 update_fail_htlcs.len(),
 912                                                                 log_bytes!(commitment_signed.channel_id));
 913                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 914                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 915                                                         });
 916                                                 for msg in update_add_htlcs {
 917                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 128)));
 918                                                 }
 919                                                 for msg in update_fulfill_htlcs {
 920                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 130)));
 921                                                 }
 922                                                 for msg in update_fail_htlcs {
 923                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 131)));
 924                                                 }
 925                                                 for msg in update_fail_malformed_htlcs {
 926                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 135)));
 927                                                 }
 928                                                 if let &Some(ref msg) = update_fee {
 929                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 134)));
 930                                                 }
 931                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed, 132)));
 932                                                 self.do_attempt_write_data(&mut descriptor, peer);
 933                                         },
 934                                         MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
 935                                                 log_trace!(self, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
 936                                                                 log_pubkey!(node_id),
 937                                                                 log_bytes!(msg.channel_id));
 938                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 939                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 940                                                         });
 941                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 133)));
 942                                                 self.do_attempt_write_data(&mut descriptor, peer);
 943                                         },
 944                                         MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
 945                                                 log_trace!(self, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
 946                                                                 log_pubkey!(node_id),
 947                                                                 log_bytes!(msg.channel_id));
 948                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 949                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 950                                                         });
 951                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 39)));
 952                                                 self.do_attempt_write_data(&mut descriptor, peer);
 953                                         },
 954                                         MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
 955                                                 log_trace!(self, "Handling Shutdown event in peer_handler for node {} for channel {}",
 956                                                                 log_pubkey!(node_id),
 957                                                                 log_bytes!(msg.channel_id));
 958                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 959                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 960                                                         });
 961                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 38)));
 962                                                 self.do_attempt_write_data(&mut descriptor, peer);
 963                                         },
 964                                         MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
 965                                                 log_trace!(self, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
 966                                                                 log_pubkey!(node_id),
 967                                                                 log_bytes!(msg.channel_id));
 968                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 969                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 970                                                         });
 971                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 136)));
 972                                                 self.do_attempt_write_data(&mut descriptor, peer);
 973                                         },
 974                                         MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
 975                                                 log_trace!(self, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
 976                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
 977                                                         let encoded_msg = encode_msg!(msg, 256);
 978                                                         let encoded_update_msg = encode_msg!(update_msg, 258);
 979
 980                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 981                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() ||
 982                                                                                 !peer.should_forward_channel(msg.contents.short_channel_id) {
 983                                                                         continue
 984                                                                 }
 985                                                                 match peer.their_node_id {
 986                                                                         None => continue,
 987                                                                         Some(their_node_id) => {
 988                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
 989                                                                                         continue
 990                                                                                 }
 991                                                                         }
 992                                                                 }
 993                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 994                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
 995                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
 996                                                         }
 997                                                 }
 998                                         },
 999                                         MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1000                                                 log_trace!(self, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1001                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1002                                                         let encoded_msg = encode_msg!(msg, 258);
1003
1004                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1005                                                                 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() ||
1006                                                                                 !peer.should_forward_channel(msg.contents.short_channel_id)  {
1007                                                                         continue
1008                                                                 }
1009                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1010                                                                 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1011                                                         }
1012                                                 }
1013                                         },
1014                                         MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1015                                                 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1016                                         },
1017                                         MessageSendEvent::HandleError { ref node_id, ref action } => {
1018                                                 match *action {
1019                                                         msgs::ErrorAction::DisconnectPeer { ref msg } => {
1020                                                                 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1021                                                                         peers.peers_needing_send.remove(&descriptor);
1022                                                                         if let Some(mut peer) = peers.peers.remove(&descriptor) {
1023                                                                                 if let Some(ref msg) = *msg {
1024                                                                                         log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1025                                                                                                         log_pubkey!(node_id),
1026                                                                                                         msg.data);
1027                                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
1028                                                                                         // This isn't guaranteed to work, but if there is enough free
1029                                                                                         // room in the send buffer, put the error message there...
1030                                                                                         self.do_attempt_write_data(&mut descriptor, &mut peer);
1031                                                                                 } else {
1032                                                                                         log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1033                                                                                 }
1034                                                                         }
1035                                                                         descriptor.disconnect_socket();
1036                                                                         self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1037                                                                 }
1038                                                         },
1039                                                         msgs::ErrorAction::IgnoreError => {},
1040                                                         msgs::ErrorAction::SendErrorMessage { ref msg } => {
1041                                                                 log_trace!(self, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1042                                                                                 log_pubkey!(node_id),
1043                                                                                 msg.data);
1044                                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1045                                                                         //TODO: Do whatever we're gonna do for handling dropped messages
1046                                                                 });
1047                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
1048                                                                 self.do_attempt_write_data(&mut descriptor, peer);
1049                                                         },
1050                                                 }
1051                                         }
1052                                 }
1053                         }
1054
1055                         for mut descriptor in peers.peers_needing_send.drain() {
1056                                 match peers.peers.get_mut(&descriptor) {
1057                                         Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1058                                         None => panic!("Inconsistent peers set state!"),
1059                                 }
1060                         }
1061                 }
1062         }
1063
1064         /// Indicates that the given socket descriptor's connection is now closed.
1065         ///
1066         /// This must be called even if a PeerHandleError was given for a read_event or write_event,
1067         /// but must NOT be called if a PeerHandleError was provided out of a new_\*\_connection event!
1068         ///
1069         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1070         pub fn disconnect_event(&self, descriptor: &Descriptor) {
1071                 self.disconnect_event_internal(descriptor, false);
1072         }
1073
1074         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1075                 let mut peers = self.peers.lock().unwrap();
1076                 peers.peers_needing_send.remove(descriptor);
1077                 let peer_option = peers.peers.remove(descriptor);
1078                 match peer_option {
1079                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1080                         Some(peer) => {
1081                                 match peer.their_node_id {
1082                                         Some(node_id) => {
1083                                                 peers.node_id_to_descriptor.remove(&node_id);
1084                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1085                                         },
1086                                         None => {}
1087                                 }
1088                         }
1089                 };
1090         }
1091 }
1092
1093 #[cfg(test)]
1094 mod tests {
1095         use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1096         use ln::msgs;
1097         use util::events;
1098         use util::test_utils;
1099         use util::logger::Logger;
1100
1101         use secp256k1::Secp256k1;
1102         use secp256k1::key::{SecretKey, PublicKey};
1103
1104         use rand::{thread_rng, Rng};
1105
1106         use std::sync::{Arc};
1107
1108         #[derive(PartialEq, Eq, Clone, Hash)]
1109         struct FileDescriptor {
1110                 fd: u16,
1111         }
1112
1113         impl SocketDescriptor for FileDescriptor {
1114                 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1115                         data.len()
1116                 }
1117
1118                 fn disconnect_socket(&mut self) {}
1119         }
1120
1121         fn create_network(peer_count: usize) -> Vec<PeerManager<FileDescriptor>> {
1122                 let mut peers = Vec::new();
1123                 let mut rng = thread_rng();
1124                 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
1125                 let mut ephemeral_bytes = [0; 32];
1126                 rng.fill_bytes(&mut ephemeral_bytes);
1127
1128                 for _ in 0..peer_count {
1129                         let chan_handler = test_utils::TestChannelMessageHandler::new();
1130                         let router = test_utils::TestRoutingMessageHandler::new();
1131                         let node_id = {
1132                                 let mut key_slice = [0;32];
1133                                 rng.fill_bytes(&mut key_slice);
1134                                 SecretKey::from_slice(&key_slice).unwrap()
1135                         };
1136                         let msg_handler = MessageHandler { chan_handler: Arc::new(chan_handler), route_handler: Arc::new(router) };
1137                         let peer = PeerManager::new(msg_handler, node_id, &ephemeral_bytes, Arc::clone(&logger));
1138                         peers.push(peer);
1139                 }
1140
1141                 peers
1142         }
1143
1144         fn establish_connection(peer_a: &PeerManager<FileDescriptor>, peer_b: &PeerManager<FileDescriptor>) {
1145                 let secp_ctx = Secp256k1::new();
1146                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peer_b.our_node_secret);
1147                 let fd = FileDescriptor { fd: 1};
1148                 peer_a.new_inbound_connection(fd.clone()).unwrap();
1149                 peer_a.peers.lock().unwrap().node_id_to_descriptor.insert(their_id, fd.clone());
1150         }
1151
1152         #[test]
1153         fn test_disconnect_peer() {
1154                 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1155                 // push a DisconnectPeer event to remove the node flagged by id
1156                 let mut peers = create_network(2);
1157                 establish_connection(&peers[0], &peers[1]);
1158                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1159
1160                 let secp_ctx = Secp256k1::new();
1161                 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1162
1163                 let chan_handler = test_utils::TestChannelMessageHandler::new();
1164                 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1165                         node_id: their_id,
1166                         action: msgs::ErrorAction::DisconnectPeer { msg: None },
1167                 });
1168                 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1169                 peers[0].message_handler.chan_handler = Arc::new(chan_handler);
1170
1171                 peers[0].process_events();
1172                 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1173         }
1174 }