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