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

   1 use secp256k1::key::{SecretKey,PublicKey};
   2
   3 use ln::msgs;
   4 use ln::msgs::{MsgEncodable,MsgDecodable};
   5 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
   6 use util::byte_utils;
   7 use util::events::{EventsProvider,Event};
   8
   9 use std::collections::{HashMap,LinkedList};
  10 use std::sync::{Arc, Mutex};
  11 use std::sync::atomic::{AtomicUsize, Ordering};
  12 use std::{cmp,error,mem,hash,fmt};
  13
  14 pub struct MessageHandler {
  15         pub chan_handler: Arc<msgs::ChannelMessageHandler>,
  16         pub route_handler: Arc<msgs::RoutingMessageHandler>,
  17 }
  18
  19 /// Provides an object which can be used to send data to and which uniquely identifies a connection
  20 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
  21 /// implement Hash to meet the PeerManager API.
  22 /// For efficiency, Clone should be relatively cheap for this type.
  23 /// You probably want to just extend an int and put a file descriptor in a struct and implement
  24 /// send_data.
  25 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
  26         /// Attempts to send some data from the given Vec starting at the given offset to the peer.
  27         /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
  28         /// Note that in the disconnected case, a disconnect_event must still fire and further write
  29         /// attempts may occur until that time.
  30         /// If the returned size is smaller than data.len() - write_offset, a write_available event must
  31         /// trigger the next time more data can be written. Additionally, until the a send_data event
  32         /// completes fully, no further read_events should trigger on the same peer!
  33         /// If a read_event on this descriptor had previously returned true (indicating that read
  34         /// events should be paused to prevent DoS in the send buffer), resume_read may be set
  35         /// indicating that read events on this descriptor should resume. A resume_read of false does
  36         /// *not* imply that further read events should be paused.
  37         fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, resume_read: bool) -> usize;
  38 }
  39
  40 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
  41 /// generate no further read/write_events for the descriptor, only triggering a single
  42 /// disconnect_event (unless it was provided in response to a new_*_connection event, in which case
  43 /// no such disconnect_event must be generated and the socket be silently disconencted).
  44 pub struct PeerHandleError {
  45         no_connection_possible: bool,
  46 }
  47 impl fmt::Debug for PeerHandleError {
  48         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  49                 formatter.write_str("Peer Sent Invalid Data")
  50         }
  51 }
  52 impl fmt::Display for PeerHandleError {
  53         fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
  54                 formatter.write_str("Peer Sent Invalid Data")
  55         }
  56 }
  57 impl error::Error for PeerHandleError {
  58         fn description(&self) -> &str {
  59                 "Peer Sent Invalid Data"
  60         }
  61 }
  62
  63 struct Peer {
  64         channel_encryptor: PeerChannelEncryptor,
  65         outbound: bool,
  66         their_node_id: Option<PublicKey>,
  67         their_global_features: Option<msgs::GlobalFeatures>,
  68         their_local_features: Option<msgs::LocalFeatures>,
  69
  70         pending_outbound_buffer: LinkedList<Vec<u8>>,
  71         pending_outbound_buffer_first_msg_offset: usize,
  72         awaiting_write_event: bool,
  73
  74         pending_read_buffer: Vec<u8>,
  75         pending_read_buffer_pos: usize,
  76         pending_read_is_header: bool,
  77 }
  78
  79 struct PeerHolder<Descriptor: SocketDescriptor> {
  80         peers: HashMap<Descriptor, Peer>,
  81         /// Only add to this set when noise completes:
  82         node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
  83 }
  84
  85 pub struct PeerManager<Descriptor: SocketDescriptor> {
  86         message_handler: MessageHandler,
  87         peers: Mutex<PeerHolder<Descriptor>>,
  88         pending_events: Mutex<Vec<Event>>,
  89         our_node_secret: SecretKey,
  90         initial_syncs_sent: AtomicUsize,
  91 }
  92
  93
  94 macro_rules! encode_msg {
  95         ($msg: expr, $msg_code: expr) => {
  96                 {
  97                         let just_msg = $msg.encode();
  98                         let mut encoded_msg = Vec::with_capacity(just_msg.len() + 2);
  99                         encoded_msg.extend_from_slice(&byte_utils::be16_to_array($msg_code));
 100                         encoded_msg.extend_from_slice(&just_msg[..]);
 101                         encoded_msg
 102                 }
 103         }
 104 }
 105
 106 //TODO: Really should do something smarter for this
 107 const INITIAL_SYNCS_TO_SEND: usize = 5;
 108
 109 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
 110 /// PeerIds may repeat, but only after disconnect_event() has been called.
 111 impl<Descriptor: SocketDescriptor> PeerManager<Descriptor> {
 112         pub fn new(message_handler: MessageHandler, our_node_secret: SecretKey) -> PeerManager<Descriptor> {
 113                 PeerManager {
 114                         message_handler: message_handler,
 115                         peers: Mutex::new(PeerHolder { peers: HashMap::new(), node_id_to_descriptor: HashMap::new() }),
 116                         pending_events: Mutex::new(Vec::new()),
 117                         our_node_secret: our_node_secret,
 118                         initial_syncs_sent: AtomicUsize::new(0),
 119                 }
 120         }
 121
 122         /// Indicates a new outbound connection has been established to a node with the given node_id.
 123         /// Note that if an Err is returned here you MUST NOT call disconnect_event for the new
 124         /// descriptor but must disconnect the connection immediately.
 125         /// Returns some bytes to send to the remote node.
 126         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 127         /// disconnect_event.
 128         pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
 129                 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone());
 130                 let res = peer_encryptor.get_act_one().to_vec();
 131                 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
 132
 133                 let mut peers = self.peers.lock().unwrap();
 134                 if peers.peers.insert(descriptor, Peer {
 135                         channel_encryptor: peer_encryptor,
 136                         outbound: true,
 137                         their_node_id: Some(their_node_id),
 138                         their_global_features: None,
 139                         their_local_features: None,
 140
 141                         pending_outbound_buffer: LinkedList::new(),
 142                         pending_outbound_buffer_first_msg_offset: 0,
 143                         awaiting_write_event: false,
 144
 145                         pending_read_buffer: pending_read_buffer,
 146                         pending_read_buffer_pos: 0,
 147                         pending_read_is_header: false,
 148                 }).is_some() {
 149                         panic!("PeerManager driver duplicated descriptors!");
 150                 };
 151                 Ok(res)
 152         }
 153
 154         /// Indicates a new inbound connection has been established.
 155         /// May refuse the connection by returning an Err, but will never write bytes to the remote end
 156         /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
 157         /// call disconnect_event for the new descriptor but must disconnect the connection
 158         /// immediately.
 159         /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
 160         /// disconnect_event.
 161         pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
 162                 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
 163                 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
 164
 165                 let mut peers = self.peers.lock().unwrap();
 166                 if peers.peers.insert(descriptor, Peer {
 167                         channel_encryptor: peer_encryptor,
 168                         outbound: false,
 169                         their_node_id: None,
 170                         their_global_features: None,
 171                         their_local_features: None,
 172
 173                         pending_outbound_buffer: LinkedList::new(),
 174                         pending_outbound_buffer_first_msg_offset: 0,
 175                         awaiting_write_event: false,
 176
 177                         pending_read_buffer: pending_read_buffer,
 178                         pending_read_buffer_pos: 0,
 179                         pending_read_is_header: false,
 180                 }).is_some() {
 181                         panic!("PeerManager driver duplicated descriptors!");
 182                 };
 183                 Ok(())
 184         }
 185
 186         fn do_attempt_write_data(descriptor: &mut Descriptor, peer: &mut Peer) {
 187                 while !peer.awaiting_write_event {
 188                         if {
 189                                 let next_buff = match peer.pending_outbound_buffer.front() {
 190                                         None => return,
 191                                         Some(buff) => buff,
 192                                 };
 193                                 let should_be_reading = peer.pending_outbound_buffer.len() < 10;
 194
 195                                 let data_sent = descriptor.send_data(next_buff, peer.pending_outbound_buffer_first_msg_offset, should_be_reading);
 196                                 peer.pending_outbound_buffer_first_msg_offset += data_sent;
 197                                 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
 198                         } {
 199                                 peer.pending_outbound_buffer_first_msg_offset = 0;
 200                                 peer.pending_outbound_buffer.pop_front();
 201                         } else {
 202                                 peer.awaiting_write_event = true;
 203                         }
 204                 }
 205         }
 206
 207         /// Indicates that there is room to write data to the given socket descriptor.
 208         /// May return an Err to indicate that the connection should be closed.
 209         /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
 210         /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
 211         /// invariants around calling write_event in case a write did not fully complete must still
 212         /// hold - be ready to call write_event again if a write call generated here isn't sufficient!
 213         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 214         pub fn write_event(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
 215                 let mut peers = self.peers.lock().unwrap();
 216                 match peers.peers.get_mut(descriptor) {
 217                         None => panic!("Descriptor for write_event is not already known to PeerManager"),
 218                         Some(peer) => {
 219                                 peer.awaiting_write_event = false;
 220                                 Self::do_attempt_write_data(descriptor, peer);
 221                         }
 222                 };
 223                 Ok(())
 224         }
 225
 226         /// Indicates that data was read from the given socket descriptor.
 227         /// May return an Err to indicate that the connection should be closed.
 228         /// Will very likely call send_data on the descriptor passed in (or a descriptor handed into
 229         /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
 230         /// invariants around calling write_event in case a write did not fully complete must still
 231         /// hold. Note that this function will often call send_data on many peers before returning, not
 232         /// just this peer!
 233         /// If Ok(true) is returned, further read_events should not be triggered until a write_event on
 234         /// this file descriptor has resume_read set (preventing DoS issues in the send buffer). Note
 235         /// that this must be true even if a send_data call with resume_read=true was made during the
 236         /// course of this function!
 237         /// Panics if the descriptor was not previously registered in a new_*_connection event.
 238         pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 239                 match self.do_read_event(peer_descriptor, data) {
 240                         Ok(res) => Ok(res),
 241                         Err(e) => {
 242                                 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
 243                                 Err(e)
 244                         }
 245                 }
 246         }
 247
 248         fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
 249                 let pause_read = {
 250                         let mut peers = self.peers.lock().unwrap();
 251                         let (should_insert_node_id, pause_read) = match peers.peers.get_mut(peer_descriptor) {
 252                                 None => panic!("Descriptor for read_event is not already known to PeerManager"),
 253                                 Some(peer) => {
 254                                         assert!(peer.pending_read_buffer.len() > 0);
 255                                         assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
 256
 257                                         let mut insert_node_id = None;
 258                                         let mut read_pos = 0;
 259                                         while read_pos < data.len() {
 260                                                 {
 261                                                         let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
 262                                                         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]);
 263                                                         read_pos += data_to_copy;
 264                                                         peer.pending_read_buffer_pos += data_to_copy;
 265                                                 }
 266
 267                                                 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
 268                                                         peer.pending_read_buffer_pos = 0;
 269
 270                                                         macro_rules! encode_and_send_msg {
 271                                                                 ($msg: expr, $msg_code: expr) => {
 272                                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
 273                                                                 }
 274                                                         }
 275
 276                                                         macro_rules! try_potential_handleerror {
 277                                                                 ($thing: expr) => {
 278                                                                         match $thing {
 279                                                                                 Ok(x) => x,
 280                                                                                 Err(e) => {
 281                                                                                         println!("Got error handling message: {}!", e.err);
 282                                                                                         if let Some(action) = e.msg {
 283                                                                                                 match action {
 284                                                                                                         msgs::ErrorAction::UpdateFailHTLC { msg } => {
 285                                                                                                                 encode_and_send_msg!(msg, 131);
 286                                                                                                                 continue;
 287                                                                                                         },
 288                                                                                                         msgs::ErrorAction::DisconnectPeer => {
 289                                                                                                                 return Err(PeerHandleError{ no_connection_possible: false });
 290                                                                                                         },
 291                                                                                                         msgs::ErrorAction::IgnoreError => {
 292                                                                                                                 continue;
 293                                                                                                         },
 294                                                                                                 }
 295                                                                                         } else {
 296                                                                                                 return Err(PeerHandleError{ no_connection_possible: false });
 297                                                                                         }
 298                                                                                 }
 299                                                                         };
 300                                                                 }
 301                                                         }
 302
 303                                                         macro_rules! try_potential_decodeerror {
 304                                                                 ($thing: expr) => {
 305                                                                         match $thing {
 306                                                                                 Ok(x) => x,
 307                                                                                 Err(_e) => {
 308                                                                                         println!("Error decoding message");
 309                                                                                         //TODO: Handle e?
 310                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 311                                                                                 }
 312                                                                         };
 313                                                                 }
 314                                                         }
 315
 316                                                         macro_rules! try_ignore_potential_decodeerror {
 317                                                                 ($thing: expr) => {
 318                                                                         match $thing {
 319                                                                                 Ok(x) => x,
 320                                                                                 Err(_e) => {
 321                                                                                         println!("Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
 322                                                                                         continue;
 323                                                                                 }
 324                                                                         };
 325                                                                 }
 326                                                         }
 327
 328                                                         let next_step = peer.channel_encryptor.get_noise_step();
 329                                                         match next_step {
 330                                                                 NextNoiseStep::ActOne => {
 331                                                                         let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_key(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
 332                                                                         peer.pending_outbound_buffer.push_back(act_two);
 333                                                                         peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
 334                                                                 },
 335                                                                 NextNoiseStep::ActTwo => {
 336                                                                         let act_three = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
 337                                                                         peer.pending_outbound_buffer.push_back(act_three);
 338                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 339                                                                         peer.pending_read_is_header = true;
 340
 341                                                                         insert_node_id = Some(peer.their_node_id.unwrap());
 342                                                                         let mut local_features = msgs::LocalFeatures::new();
 343                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 344                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 345                                                                                 local_features.set_initial_routing_sync();
 346                                                                         }
 347                                                                         encode_and_send_msg!(msgs::Init {
 348                                                                                 global_features: msgs::GlobalFeatures::new(),
 349                                                                                 local_features,
 350                                                                         }, 16);
 351                                                                 },
 352                                                                 NextNoiseStep::ActThree => {
 353                                                                         let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
 354                                                                         peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
 355                                                                         peer.pending_read_is_header = true;
 356                                                                         peer.their_node_id = Some(their_node_id);
 357                                                                         insert_node_id = Some(peer.their_node_id.unwrap());
 358                                                                 },
 359                                                                 NextNoiseStep::NoiseComplete => {
 360                                                                         if peer.pending_read_is_header {
 361                                                                                 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
 362                                                                                 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
 363                                                                                 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
 364                                                                                 if msg_len < 2 { // Need at least the message type tag
 365                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 366                                                                                 }
 367                                                                                 peer.pending_read_is_header = false;
 368                                                                         } else {
 369                                                                                 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
 370                                                                                 assert!(msg_data.len() >= 2);
 371
 372                                                                                 // Reset read buffer
 373                                                                                 peer.pending_read_buffer = [0; 18].to_vec();
 374                                                                                 peer.pending_read_is_header = true;
 375
 376                                                                                 let msg_type = byte_utils::slice_to_be16(&msg_data[0..2]);
 377                                                                                 if msg_type != 16 && peer.their_global_features.is_none() {
 378                                                                                         // Need an init message as first message
 379                                                                                         return Err(PeerHandleError{ no_connection_possible: false });
 380                                                                                 }
 381                                                                                 match msg_type {
 382                                                                                         // Connection control:
 383                                                                                         16 => {
 384                                                                                                 let msg = try_potential_decodeerror!(msgs::Init::decode(&msg_data[2..]));
 385                                                                                                 if msg.global_features.requires_unknown_bits() {
 386                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 387                                                                                                 }
 388                                                                                                 if msg.local_features.requires_unknown_bits() {
 389                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 390                                                                                                 }
 391                                                                                                 peer.their_global_features = Some(msg.global_features);
 392                                                                                                 peer.their_local_features = Some(msg.local_features);
 393
 394                                                                                                 if !peer.outbound {
 395                                                                                                         let mut local_features = msgs::LocalFeatures::new();
 396                                                                                                         if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
 397                                                                                                                 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
 398                                                                                                                 local_features.set_initial_routing_sync();
 399                                                                                                         }
 400                                                                                                         encode_and_send_msg!(msgs::Init {
 401                                                                                                                 global_features: msgs::GlobalFeatures::new(),
 402                                                                                                                 local_features,
 403                                                                                                         }, 16);
 404                                                                                                 }
 405                                                                                         },
 406                                                                                         17 => {
 407                                                                                                 // Error msg
 408                                                                                         },
 409
 410                                                                                         18 => {
 411                                                                                                 let msg = try_potential_decodeerror!(msgs::Ping::decode(&msg_data[2..]));
 412                                                                                                 let resp = msgs::Pong { byteslen: msg.ponglen };
 413                                                                                                 encode_and_send_msg!(resp, 19);
 414                                                                                         },
 415                                                                                         19 => {
 416                                                                                                 try_potential_decodeerror!(msgs::Pong::decode(&msg_data[2..]));
 417                                                                                         },
 418
 419                                                                                         // Channel control:
 420                                                                                         32 => {
 421                                                                                                 let msg = try_potential_decodeerror!(msgs::OpenChannel::decode(&msg_data[2..]));
 422                                                                                                 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg));
 423                                                                                                 encode_and_send_msg!(resp, 33);
 424                                                                                         },
 425                                                                                         33 => {
 426                                                                                                 let msg = try_potential_decodeerror!(msgs::AcceptChannel::decode(&msg_data[2..]));
 427                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), &msg));
 428                                                                                         },
 429
 430                                                                                         34 => {
 431                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingCreated::decode(&msg_data[2..]));
 432                                                                                                 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg));
 433                                                                                                 encode_and_send_msg!(resp, 35);
 434                                                                                         },
 435                                                                                         35 => {
 436                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingSigned::decode(&msg_data[2..]));
 437                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg));
 438                                                                                         },
 439                                                                                         36 => {
 440                                                                                                 let msg = try_potential_decodeerror!(msgs::FundingLocked::decode(&msg_data[2..]));
 441                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg));
 442                                                                                                 match resp_option {
 443                                                                                                         Some(resp) => encode_and_send_msg!(resp, 259),
 444                                                                                                         None => {},
 445                                                                                                 }
 446                                                                                         },
 447
 448                                                                                         38 => {
 449                                                                                                 let msg = try_potential_decodeerror!(msgs::Shutdown::decode(&msg_data[2..]));
 450                                                                                                 let resp_options = try_potential_handleerror!(self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg));
 451                                                                                                 if let Some(resp) = resp_options.0 {
 452                                                                                                         encode_and_send_msg!(resp, 38);
 453                                                                                                 }
 454                                                                                                 if let Some(resp) = resp_options.1 {
 455                                                                                                         encode_and_send_msg!(resp, 39);
 456                                                                                                 }
 457                                                                                         },
 458                                                                                         39 => {
 459                                                                                                 let msg = try_potential_decodeerror!(msgs::ClosingSigned::decode(&msg_data[2..]));
 460                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg));
 461                                                                                                 if let Some(resp) = resp_option {
 462                                                                                                         encode_and_send_msg!(resp, 39);
 463                                                                                                 }
 464                                                                                         },
 465
 466                                                                                         128 => {
 467                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateAddHTLC::decode(&msg_data[2..]));
 468                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg));
 469                                                                                         },
 470                                                                                         130 => {
 471                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFulfillHTLC::decode(&msg_data[2..]));
 472                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg));
 473                                                                                         },
 474                                                                                         131 => {
 475                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailHTLC::decode(&msg_data[2..]));
 476                                                                                                 let chan_update = try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg));
 477                                                                                                 if let Some(update) = chan_update {
 478                                                                                                         self.message_handler.route_handler.handle_htlc_fail_channel_update(&update);
 479                                                                                                 }
 480                                                                                         },
 481                                                                                         135 => {
 482                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFailMalformedHTLC::decode(&msg_data[2..]));
 483                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg));
 484                                                                                         },
 485
 486                                                                                         132 => {
 487                                                                                                 let msg = try_potential_decodeerror!(msgs::CommitmentSigned::decode(&msg_data[2..]));
 488                                                                                                 let resps = try_potential_handleerror!(self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg));
 489                                                                                                 encode_and_send_msg!(resps.0, 133);
 490                                                                                                 if let Some(resp) = resps.1 {
 491                                                                                                         encode_and_send_msg!(resp, 132);
 492                                                                                                 }
 493                                                                                         },
 494                                                                                         133 => {
 495                                                                                                 let msg = try_potential_decodeerror!(msgs::RevokeAndACK::decode(&msg_data[2..]));
 496                                                                                                 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg));
 497                                                                                                 match resp_option {
 498                                                                                                         Some(resps) => {
 499                                                                                                                 for resp in resps.update_add_htlcs {
 500                                                                                                                         encode_and_send_msg!(resp, 128);
 501                                                                                                                 }
 502                                                                                                                 for resp in resps.update_fulfill_htlcs {
 503                                                                                                                         encode_and_send_msg!(resp, 130);
 504                                                                                                                 }
 505                                                                                                                 for resp in resps.update_fail_htlcs {
 506                                                                                                                         encode_and_send_msg!(resp, 131);
 507                                                                                                                 }
 508                                                                                                                 encode_and_send_msg!(resps.commitment_signed, 132);
 509                                                                                                         },
 510                                                                                                         None => {},
 511                                                                                                 }
 512                                                                                         },
 513                                                                                         134 => {
 514                                                                                                 let msg = try_potential_decodeerror!(msgs::UpdateFee::decode(&msg_data[2..]));
 515                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg));
 516                                                                                         },
 517                                                                                         136 => { }, // TODO: channel_reestablish
 518
 519                                                                                         // Routing control:
 520                                                                                         259 => {
 521                                                                                                 let msg = try_potential_decodeerror!(msgs::AnnouncementSignatures::decode(&msg_data[2..]));
 522                                                                                                 try_potential_handleerror!(self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg));
 523                                                                                         },
 524                                                                                         256 => {
 525                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelAnnouncement::decode(&msg_data[2..]));
 526                                                                                                 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
 527
 528                                                                                                 if should_forward {
 529                                                                                                         // TODO: forward msg along to all our other peers!
 530                                                                                                 }
 531                                                                                         },
 532                                                                                         257 => {
 533                                                                                                 let msg = try_ignore_potential_decodeerror!(msgs::NodeAnnouncement::decode(&msg_data[2..]));
 534                                                                                                 try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
 535                                                                                         },
 536                                                                                         258 => {
 537                                                                                                 let msg = try_potential_decodeerror!(msgs::ChannelUpdate::decode(&msg_data[2..]));
 538                                                                                                 try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
 539                                                                                         },
 540                                                                                         _ => {
 541                                                                                                 if (msg_type & 1) == 0 {
 542                                                                                                         return Err(PeerHandleError{ no_connection_possible: true });
 543                                                                                                 }
 544                                                                                         },
 545                                                                                 }
 546                                                                         }
 547                                                                 }
 548                                                         }
 549                                                 }
 550                                         }
 551
 552                                         Self::do_attempt_write_data(peer_descriptor, peer);
 553
 554                                         (insert_node_id /* should_insert_node_id */, peer.pending_outbound_buffer.len() > 10) // pause_read
 555                                 }
 556                         };
 557
 558                         match should_insert_node_id {
 559                                 Some(node_id) => { peers.node_id_to_descriptor.insert(node_id, peer_descriptor.clone()); },
 560                                 None => {}
 561                         };
 562
 563                         pause_read
 564                 };
 565
 566                 self.process_events();
 567
 568                 Ok(pause_read)
 569         }
 570
 571         /// Checks for any events generated by our handlers and processes them. May be needed after eg
 572         /// calls to ChannelManager::process_pending_htlc_forward.
 573         pub fn process_events(&self) {
 574                 let mut upstream_events = Vec::new();
 575                 {
 576                         // TODO: There are some DoS attacks here where you can flood someone's outbound send
 577                         // buffer by doing things like announcing channels on another node. We should be willing to
 578                         // drop optional-ish messages when send buffers get full!
 579
 580                         let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_events();
 581                         let mut peers = self.peers.lock().unwrap();
 582                         for event in events_generated.drain(..) {
 583                                 macro_rules! get_peer_for_forwarding {
 584                                         ($node_id: expr, $handle_no_such_peer: block) => {
 585                                                 {
 586                                                         let descriptor = match peers.node_id_to_descriptor.get($node_id) {
 587                                                                 Some(descriptor) => descriptor.clone(),
 588                                                                 None => {
 589                                                                         $handle_no_such_peer;
 590                                                                         continue;
 591                                                                 },
 592                                                         };
 593                                                         match peers.peers.get_mut(&descriptor) {
 594                                                                 Some(peer) => {
 595                                                                         (descriptor, peer)
 596                                                                 },
 597                                                                 None => panic!("Inconsistent peers set state!"),
 598                                                         }
 599                                                 }
 600                                         }
 601                                 }
 602                                 match event {
 603                                         Event::FundingGenerationReady {..} => { /* Hand upstream */ },
 604                                         Event::FundingBroadcastSafe {..} => { /* Hand upstream */ },
 605                                         Event::PaymentReceived {..} => { /* Hand upstream */ },
 606                                         Event::PaymentSent {..} => { /* Hand upstream */ },
 607                                         Event::PaymentFailed {..} => { /* Hand upstream */ },
 608
 609                                         Event::PendingHTLCsForwardable {..} => {
 610                                                 //TODO: Handle upstream in some confused form so that upstream just knows
 611                                                 //to call us somehow?
 612                                         },
 613                                         Event::SendFundingCreated { ref node_id, ref msg } => {
 614                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 615                                                                 //TODO: generate a DiscardFunding event indicating to the wallet that
 616                                                                 //they should just throw away this funding transaction
 617                                                         });
 618                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 34)));
 619                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 620                                                 continue;
 621                                         },
 622                                         Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
 623                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 624                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 625                                                         });
 626                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 36)));
 627                                                 match announcement_sigs {
 628                                                         &Some(ref announce_msg) => peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(announce_msg, 259))),
 629                                                         &None => {},
 630                                                 }
 631                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 632                                                 continue;
 633                                         },
 634                                         Event::SendHTLCs { ref node_id, ref msgs, ref commitment_msg } => {
 635                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 636                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 637                                                         });
 638                                                 for msg in msgs {
 639                                                         peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 128)));
 640                                                 }
 641                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_msg, 132)));
 642                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 643                                                 continue;
 644                                         },
 645                                         Event::SendFulfillHTLC { ref node_id, ref msg, ref commitment_msg } => {
 646                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 647                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 648                                                         });
 649                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 130)));
 650                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_msg, 132)));
 651                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 652                                                 continue;
 653                                         },
 654                                         Event::SendFailHTLC { ref node_id, ref msg, ref commitment_msg } => {
 655                                                 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
 656                                                                 //TODO: Do whatever we're gonna do for handling dropped messages
 657                                                         });
 658                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 131)));
 659                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_msg, 132)));
 660                                                 Self::do_attempt_write_data(&mut descriptor, peer);
 661                                                 continue;
 662                                         },
 663                                         Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
 664                                                 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
 665                                                         let encoded_msg = encode_msg!(msg, 256);
 666                                                         let encoded_update_msg = encode_msg!(update_msg, 258);
 667
 668                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 669                                                                 if !peer.channel_encryptor.is_ready_for_encryption() {
 670                                                                         continue
 671                                                                 }
 672                                                                 match peer.their_node_id {
 673                                                                         None => continue,
 674                                                                         Some(their_node_id) => {
 675                                                                                 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
 676                                                                                         continue
 677                                                                                 }
 678                                                                         }
 679                                                                 }
 680                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 681                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
 682                                                                 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
 683                                                         }
 684                                                 }
 685                                                 continue;
 686                                         },
 687                                         Event::BroadcastChannelUpdate { ref msg } => {
 688                                                 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
 689                                                         let encoded_msg = encode_msg!(msg, 258);
 690
 691                                                         for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
 692                                                                 if !peer.channel_encryptor.is_ready_for_encryption() {
 693                                                                         continue
 694                                                                 }
 695                                                                 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
 696                                                                 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
 697                                                         }
 698                                                 }
 699                                                 continue;
 700                                         },
 701                                 }
 702
 703                                 upstream_events.push(event);
 704                         }
 705                 }
 706
 707                 let mut pending_events = self.pending_events.lock().unwrap();
 708                 for event in upstream_events.drain(..) {
 709                         pending_events.push(event);
 710                 }
 711         }
 712
 713         /// Indicates that the given socket descriptor's connection is now closed.
 714         /// This must be called even if a PeerHandleError was given for a read_event or write_event,
 715         /// but must NOT be called if a PeerHandleError was provided out of a new_*_connection event!
 716         /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
 717         pub fn disconnect_event(&self, descriptor: &Descriptor) {
 718                 self.disconnect_event_internal(descriptor, false);
 719         }
 720
 721         fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
 722                 let mut peers = self.peers.lock().unwrap();
 723                 let peer_option = peers.peers.remove(descriptor);
 724                 match peer_option {
 725                         None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
 726                         Some(peer) => {
 727                                 match peer.their_node_id {
 728                                         Some(node_id) => {
 729                                                 peers.node_id_to_descriptor.remove(&node_id);
 730                                                 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
 731                                         },
 732                                         None => {}
 733                                 }
 734                         }
 735                 };
 736         }
 737 }
 738
 739 impl<Descriptor: SocketDescriptor> EventsProvider for PeerManager<Descriptor> {
 740         fn get_and_clear_pending_events(&self) -> Vec<Event> {
 741                 let mut pending_events = self.pending_events.lock().unwrap();
 742                 let mut ret = Vec::new();
 743                 mem::swap(&mut ret, &mut *pending_events);
 744                 ret
 745         }
 746 }