1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! Top level peer message handling and socket handling logic lives here.
12 //! Instead of actually servicing sockets ourselves we require that you implement the
13 //! SocketDescriptor interface and use that to receive actions which you should perform on the
14 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
15 //! call into the provided message handlers (probably a ChannelManager and NetGraphmsgHandler) with messages
16 //! they should handle, and encoding/sending response messages.
18 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
20 use ln::features::InitFeatures;
22 use ln::msgs::{ChannelMessageHandler, LightningError, RoutingMessageHandler};
23 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
24 use util::ser::{VecWriter, Writeable};
25 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
29 use util::events::{MessageSendEvent, MessageSendEventsProvider};
30 use util::logger::Logger;
31 use routing::network_graph::NetGraphMsgHandler;
33 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
34 use std::sync::{Arc, Mutex};
35 use std::sync::atomic::{AtomicUsize, Ordering};
36 use std::{cmp,error,hash,fmt};
39 use bitcoin::hashes::sha256::Hash as Sha256;
40 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
41 use bitcoin::hashes::{HashEngine, Hash};
43 /// Provides references to trait impls which handle different types of messages.
44 pub struct MessageHandler<CM: Deref, RM: Deref> where
45 CM::Target: ChannelMessageHandler,
46 RM::Target: RoutingMessageHandler {
47 /// A message handler which handles messages specific to channels. Usually this is just a
48 /// ChannelManager object.
50 /// A message handler which handles messages updating our knowledge of the network channel
51 /// graph. Usually this is just a NetGraphMsgHandlerMonitor object.
52 pub route_handler: RM,
55 /// Provides an object which can be used to send data to and which uniquely identifies a connection
56 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
57 /// implement Hash to meet the PeerManager API.
59 /// For efficiency, Clone should be relatively cheap for this type.
61 /// You probably want to just extend an int and put a file descriptor in a struct and implement
62 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
63 /// be careful to ensure you don't have races whereby you might register a new connection with an
64 /// fd which is the same as a previous one which has yet to be removed via
65 /// PeerManager::socket_disconnected().
66 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
67 /// Attempts to send some data from the given slice to the peer.
69 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
70 /// Note that in the disconnected case, socket_disconnected must still fire and further write
71 /// attempts may occur until that time.
73 /// If the returned size is smaller than data.len(), a write_available event must
74 /// trigger the next time more data can be written. Additionally, until the a send_data event
75 /// completes fully, no further read_events should trigger on the same peer!
77 /// If a read_event on this descriptor had previously returned true (indicating that read
78 /// events should be paused to prevent DoS in the send buffer), resume_read may be set
79 /// indicating that read events on this descriptor should resume. A resume_read of false does
80 /// *not* imply that further read events should be paused.
81 fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
82 /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
83 /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
84 /// this descriptor. No socket_disconnected call should be generated as a result of this call,
85 /// though races may occur whereby disconnect_socket is called after a call to
86 /// socket_disconnected but prior to socket_disconnected returning.
87 fn disconnect_socket(&mut self);
90 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
91 /// generate no further read_event/write_buffer_space_avail/socket_disconnected calls for the
94 pub struct PeerHandleError {
95 /// Used to indicate that we probably can't make any future connections to this peer, implying
96 /// we should go ahead and force-close any channels we have with it.
97 pub no_connection_possible: bool,
99 impl fmt::Debug for PeerHandleError {
100 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
101 formatter.write_str("Peer Sent Invalid Data")
104 impl fmt::Display for PeerHandleError {
105 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
106 formatter.write_str("Peer Sent Invalid Data")
109 impl error::Error for PeerHandleError {
110 fn description(&self) -> &str {
111 "Peer Sent Invalid Data"
115 enum InitSyncTracker{
117 ChannelsSyncing(u64),
118 NodesSyncing(PublicKey),
122 channel_encryptor: PeerChannelEncryptor,
124 their_node_id: Option<PublicKey>,
125 their_features: Option<InitFeatures>,
127 pending_outbound_buffer: LinkedList<Vec<u8>>,
128 pending_outbound_buffer_first_msg_offset: usize,
129 awaiting_write_event: bool,
131 pending_read_buffer: Vec<u8>,
132 pending_read_buffer_pos: usize,
133 pending_read_is_header: bool,
135 sync_status: InitSyncTracker,
141 /// Returns true if the channel announcements/updates for the given channel should be
142 /// forwarded to this peer.
143 /// If we are sending our routing table to this peer and we have not yet sent channel
144 /// announcements/updates for the given channel_id then we will send it when we get to that
145 /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
146 /// sent the old versions, we should send the update, and so return true here.
147 fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
148 match self.sync_status {
149 InitSyncTracker::NoSyncRequested => true,
150 InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
151 InitSyncTracker::NodesSyncing(_) => true,
155 /// Similar to the above, but for node announcements indexed by node_id.
156 fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
157 match self.sync_status {
158 InitSyncTracker::NoSyncRequested => true,
159 InitSyncTracker::ChannelsSyncing(_) => false,
160 InitSyncTracker::NodesSyncing(pk) => pk < node_id,
165 struct PeerHolder<Descriptor: SocketDescriptor> {
166 peers: HashMap<Descriptor, Peer>,
167 /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
168 /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
169 peers_needing_send: HashSet<Descriptor>,
170 /// Only add to this set when noise completes:
171 node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
174 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
175 fn _check_usize_is_32_or_64() {
176 // See below, less than 32 bit pointers may be unsafe here!
177 unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
180 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
181 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
182 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
183 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
184 /// issues such as overly long function definitions.
185 pub type SimpleArcPeerManager<SD, M, T, F, C, L> = Arc<PeerManager<SD, SimpleArcChannelManager<M, T, F, L>, Arc<NetGraphMsgHandler<Arc<C>, Arc<L>>>, Arc<L>>>;
187 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
188 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
189 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
190 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
191 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
192 /// helps with issues such as long function definitions.
193 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, 'f, 'g, SD, M, T, F, C, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e NetGraphMsgHandler<&'g C, &'f L>, &'f L>;
195 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
196 /// events into messages which it passes on to its MessageHandlers.
198 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
199 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
200 /// essentially you should default to using a SimpleRefPeerManager, and use a
201 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
202 /// you're using lightning-net-tokio.
203 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> where
204 CM::Target: ChannelMessageHandler,
205 RM::Target: RoutingMessageHandler,
207 message_handler: MessageHandler<CM, RM>,
208 peers: Mutex<PeerHolder<Descriptor>>,
209 our_node_secret: SecretKey,
210 ephemeral_key_midstate: Sha256Engine,
212 // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
213 // bits we will never realistically count into high:
214 peer_counter_low: AtomicUsize,
215 peer_counter_high: AtomicUsize,
220 enum MessageHandlingError {
221 PeerHandleError(PeerHandleError),
222 LightningError(LightningError),
225 impl From<PeerHandleError> for MessageHandlingError {
226 fn from(error: PeerHandleError) -> Self {
227 MessageHandlingError::PeerHandleError(error)
231 impl From<LightningError> for MessageHandlingError {
232 fn from(error: LightningError) -> Self {
233 MessageHandlingError::LightningError(error)
237 macro_rules! encode_msg {
239 let mut buffer = VecWriter(Vec::new());
240 wire::write($msg, &mut buffer).unwrap();
245 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
246 /// PeerIds may repeat, but only after socket_disconnected() has been called.
247 impl<Descriptor: SocketDescriptor, CM: Deref, RM: Deref, L: Deref> PeerManager<Descriptor, CM, RM, L> where
248 CM::Target: ChannelMessageHandler,
249 RM::Target: RoutingMessageHandler,
251 /// Constructs a new PeerManager with the given message handlers and node_id secret key
252 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
253 /// cryptographically secure random bytes.
254 pub fn new(message_handler: MessageHandler<CM, RM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> Self {
255 let mut ephemeral_key_midstate = Sha256::engine();
256 ephemeral_key_midstate.input(ephemeral_random_data);
260 peers: Mutex::new(PeerHolder {
261 peers: HashMap::new(),
262 peers_needing_send: HashSet::new(),
263 node_id_to_descriptor: HashMap::new()
266 ephemeral_key_midstate,
267 peer_counter_low: AtomicUsize::new(0),
268 peer_counter_high: AtomicUsize::new(0),
273 /// Get the list of node ids for peers which have completed the initial handshake.
275 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
276 /// new_outbound_connection, however entries will only appear once the initial handshake has
277 /// completed and we are sure the remote peer has the private key for the given node_id.
278 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
279 let peers = self.peers.lock().unwrap();
280 peers.peers.values().filter_map(|p| {
281 if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
288 fn get_ephemeral_key(&self) -> SecretKey {
289 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
290 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
291 let high = if low == 0 {
292 self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
294 self.peer_counter_high.load(Ordering::Acquire)
296 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
297 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
298 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
301 /// Indicates a new outbound connection has been established to a node with the given node_id.
302 /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
303 /// descriptor but must disconnect the connection immediately.
305 /// Returns a small number of bytes to send to the remote node (currently always 50).
307 /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
308 /// socket_disconnected().
309 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
310 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
311 let res = peer_encryptor.get_act_one().to_vec();
312 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
314 let mut peers = self.peers.lock().unwrap();
315 if peers.peers.insert(descriptor, Peer {
316 channel_encryptor: peer_encryptor,
319 their_features: None,
321 pending_outbound_buffer: LinkedList::new(),
322 pending_outbound_buffer_first_msg_offset: 0,
323 awaiting_write_event: false,
326 pending_read_buffer_pos: 0,
327 pending_read_is_header: false,
329 sync_status: InitSyncTracker::NoSyncRequested,
331 awaiting_pong: false,
333 panic!("PeerManager driver duplicated descriptors!");
338 /// Indicates a new inbound connection has been established.
340 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
341 /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
342 /// call socket_disconnected for the new descriptor but must disconnect the connection
345 /// Panics if descriptor is duplicative with some other descriptor which has not yet had
346 /// socket_disconnected called.
347 pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
348 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
349 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
351 let mut peers = self.peers.lock().unwrap();
352 if peers.peers.insert(descriptor, Peer {
353 channel_encryptor: peer_encryptor,
356 their_features: None,
358 pending_outbound_buffer: LinkedList::new(),
359 pending_outbound_buffer_first_msg_offset: 0,
360 awaiting_write_event: false,
363 pending_read_buffer_pos: 0,
364 pending_read_is_header: false,
366 sync_status: InitSyncTracker::NoSyncRequested,
368 awaiting_pong: false,
370 panic!("PeerManager driver duplicated descriptors!");
375 fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
376 macro_rules! encode_and_send_msg {
379 log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
380 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
384 const MSG_BUFF_SIZE: usize = 10;
385 while !peer.awaiting_write_event {
386 if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
387 match peer.sync_status {
388 InitSyncTracker::NoSyncRequested => {},
389 InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
390 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
391 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
392 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
393 encode_and_send_msg!(announce);
394 if let &Some(ref update_a) = update_a_option {
395 encode_and_send_msg!(update_a);
397 if let &Some(ref update_b) = update_b_option {
398 encode_and_send_msg!(update_b);
400 peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
402 if all_messages.is_empty() || all_messages.len() != steps as usize {
403 peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
406 InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
407 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
408 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
409 for msg in all_messages.iter() {
410 encode_and_send_msg!(msg);
411 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
413 if all_messages.is_empty() || all_messages.len() != steps as usize {
414 peer.sync_status = InitSyncTracker::NoSyncRequested;
417 InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
418 InitSyncTracker::NodesSyncing(key) => {
419 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
420 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
421 for msg in all_messages.iter() {
422 encode_and_send_msg!(msg);
423 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
425 if all_messages.is_empty() || all_messages.len() != steps as usize {
426 peer.sync_status = InitSyncTracker::NoSyncRequested;
433 let next_buff = match peer.pending_outbound_buffer.front() {
438 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
439 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
440 let data_sent = descriptor.send_data(pending, should_be_reading);
441 peer.pending_outbound_buffer_first_msg_offset += data_sent;
442 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
444 peer.pending_outbound_buffer_first_msg_offset = 0;
445 peer.pending_outbound_buffer.pop_front();
447 peer.awaiting_write_event = true;
452 /// Indicates that there is room to write data to the given socket descriptor.
454 /// May return an Err to indicate that the connection should be closed.
456 /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
457 /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
458 /// invariants around calling write_buffer_space_avail in case a write did not fully complete
459 /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
460 /// here isn't sufficient! Panics if the descriptor was not previously registered in a
461 /// new_\*_connection event.
462 pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
463 let mut peers = self.peers.lock().unwrap();
464 match peers.peers.get_mut(descriptor) {
465 None => panic!("Descriptor for write_event is not already known to PeerManager"),
467 peer.awaiting_write_event = false;
468 self.do_attempt_write_data(descriptor, peer);
474 /// Indicates that data was read from the given socket descriptor.
476 /// May return an Err to indicate that the connection should be closed.
478 /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
479 /// Thus, however, you almost certainly want to call process_events() after any read_event to
480 /// generate send_data calls to handle responses.
482 /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
483 /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
485 /// Panics if the descriptor was not previously registered in a new_*_connection event.
486 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
487 match self.do_read_event(peer_descriptor, data) {
490 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
496 /// Append a message to a peer's pending outbound/write buffer, and update the map of peers needing sends accordingly.
497 fn enqueue_message<M: Encode + Writeable>(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, descriptor: Descriptor, message: &M) {
498 let mut buffer = VecWriter(Vec::new());
499 wire::write(message, &mut buffer).unwrap(); // crash if the write failed
500 let encoded_message = buffer.0;
502 log_trace!(self.logger, "Enqueueing message of type {} to {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
503 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_message[..]));
504 peers_needing_send.insert(descriptor);
507 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
509 let mut peers_lock = self.peers.lock().unwrap();
510 let peers = &mut *peers_lock;
511 let pause_read = match peers.peers.get_mut(peer_descriptor) {
512 None => panic!("Descriptor for read_event is not already known to PeerManager"),
514 assert!(peer.pending_read_buffer.len() > 0);
515 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
517 let mut read_pos = 0;
518 while read_pos < data.len() {
520 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
521 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]);
522 read_pos += data_to_copy;
523 peer.pending_read_buffer_pos += data_to_copy;
526 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
527 peer.pending_read_buffer_pos = 0;
529 macro_rules! try_potential_handleerror {
535 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
536 //TODO: Try to push msg
537 log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
538 return Err(PeerHandleError{ no_connection_possible: false });
540 msgs::ErrorAction::IgnoreError => {
541 log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
544 msgs::ErrorAction::SendErrorMessage { msg } => {
545 log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
546 self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &msg);
555 macro_rules! insert_node_id {
557 match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
558 hash_map::Entry::Occupied(_) => {
559 log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
560 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
561 return Err(PeerHandleError{ no_connection_possible: false })
563 hash_map::Entry::Vacant(entry) => {
564 log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
565 entry.insert(peer_descriptor.clone())
571 let next_step = peer.channel_encryptor.get_noise_step();
573 NextNoiseStep::ActOne => {
574 let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_keys(&peer.pending_read_buffer[..], &self.our_node_secret, self.get_ephemeral_key())).to_vec();
575 peer.pending_outbound_buffer.push_back(act_two);
576 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
578 NextNoiseStep::ActTwo => {
579 let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
580 peer.pending_outbound_buffer.push_back(act_three.to_vec());
581 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
582 peer.pending_read_is_header = true;
584 peer.their_node_id = Some(their_node_id);
586 let features = InitFeatures::known();
587 let resp = msgs::Init { features };
588 self.enqueue_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), &resp);
590 NextNoiseStep::ActThree => {
591 let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
592 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
593 peer.pending_read_is_header = true;
594 peer.their_node_id = Some(their_node_id);
597 NextNoiseStep::NoiseComplete => {
598 if peer.pending_read_is_header {
599 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
600 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
601 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
602 if msg_len < 2 { // Need at least the message type tag
603 return Err(PeerHandleError{ no_connection_possible: false });
605 peer.pending_read_is_header = false;
607 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
608 assert!(msg_data.len() >= 2);
611 peer.pending_read_buffer = [0; 18].to_vec();
612 peer.pending_read_is_header = true;
614 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
615 let message_result = wire::read(&mut reader);
616 let message = match message_result {
620 msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
621 msgs::DecodeError::UnknownRequiredFeature => {
622 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
625 msgs::DecodeError::InvalidValue => {
626 log_debug!(self.logger, "Got an invalid value while deserializing message");
627 return Err(PeerHandleError { no_connection_possible: false });
629 msgs::DecodeError::ShortRead => {
630 log_debug!(self.logger, "Deserialization failed due to shortness of message");
631 return Err(PeerHandleError { no_connection_possible: false });
633 msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
634 msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
639 if let Err(handling_error) = self.handle_message(&mut peers.peers_needing_send, peer, peer_descriptor.clone(), message){
640 match handling_error {
641 MessageHandlingError::PeerHandleError(e) => { return Err(e) },
642 MessageHandlingError::LightningError(e) => {
643 try_potential_handleerror!(Err(e));
653 self.do_attempt_write_data(peer_descriptor, peer);
655 peer.pending_outbound_buffer.len() > 10 // pause_read
665 /// Process an incoming message and return a decision (ok, lightning error, peer handling error) regarding the next action with the peer
666 fn handle_message(&self, peers_needing_send: &mut HashSet<Descriptor>, peer: &mut Peer, peer_descriptor: Descriptor, message: wire::Message) -> Result<(), MessageHandlingError> {
667 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
669 // Need an Init as first message
670 if let wire::Message::Init(_) = message {
671 } else if peer.their_features.is_none() {
672 log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
673 return Err(PeerHandleError{ no_connection_possible: false }.into());
677 // Setup and Control messages:
678 wire::Message::Init(msg) => {
679 if msg.features.requires_unknown_bits() {
680 log_info!(self.logger, "Peer features required unknown version bits");
681 return Err(PeerHandleError{ no_connection_possible: true }.into());
683 if peer.their_features.is_some() {
684 return Err(PeerHandleError{ no_connection_possible: false }.into());
688 self.logger, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, gossip_queries: {}, static_remote_key: {}, unknown flags (local and global): {}",
689 if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
690 if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
691 if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
692 if msg.features.supports_gossip_queries() { "supported" } else { "not supported" },
693 if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
694 if msg.features.supports_unknown_bits() { "present" } else { "none" }
697 if msg.features.initial_routing_sync() {
698 peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
699 peers_needing_send.insert(peer_descriptor.clone());
701 if !msg.features.supports_static_remote_key() {
702 log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
703 return Err(PeerHandleError{ no_connection_possible: true }.into());
707 let features = InitFeatures::known();
708 let resp = msgs::Init { features };
709 self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
712 self.message_handler.route_handler.sync_routing_table(&peer.their_node_id.unwrap(), &msg);
714 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
715 peer.their_features = Some(msg.features);
717 wire::Message::Error(msg) => {
718 let mut data_is_printable = true;
719 for b in msg.data.bytes() {
720 if b < 32 || b > 126 {
721 data_is_printable = false;
726 if data_is_printable {
727 log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
729 log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
731 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
732 if msg.channel_id == [0; 32] {
733 return Err(PeerHandleError{ no_connection_possible: true }.into());
737 wire::Message::Ping(msg) => {
738 if msg.ponglen < 65532 {
739 let resp = msgs::Pong { byteslen: msg.ponglen };
740 self.enqueue_message(peers_needing_send, peer, peer_descriptor.clone(), &resp);
743 wire::Message::Pong(_msg) => {
744 peer.awaiting_pong = false;
748 wire::Message::OpenChannel(msg) => {
749 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
751 wire::Message::AcceptChannel(msg) => {
752 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
755 wire::Message::FundingCreated(msg) => {
756 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
758 wire::Message::FundingSigned(msg) => {
759 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
761 wire::Message::FundingLocked(msg) => {
762 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
765 wire::Message::Shutdown(msg) => {
766 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), peer.their_features.as_ref().unwrap(), &msg);
768 wire::Message::ClosingSigned(msg) => {
769 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
772 // Commitment messages:
773 wire::Message::UpdateAddHTLC(msg) => {
774 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
776 wire::Message::UpdateFulfillHTLC(msg) => {
777 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
779 wire::Message::UpdateFailHTLC(msg) => {
780 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
782 wire::Message::UpdateFailMalformedHTLC(msg) => {
783 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
786 wire::Message::CommitmentSigned(msg) => {
787 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
789 wire::Message::RevokeAndACK(msg) => {
790 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
792 wire::Message::UpdateFee(msg) => {
793 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
795 wire::Message::ChannelReestablish(msg) => {
796 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
800 wire::Message::AnnouncementSignatures(msg) => {
801 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
803 wire::Message::ChannelAnnouncement(msg) => {
804 let should_forward = match self.message_handler.route_handler.handle_channel_announcement(&msg) {
806 Err(e) => { return Err(e.into()); },
810 // TODO: forward msg along to all our other peers!
813 wire::Message::NodeAnnouncement(msg) => {
814 let should_forward = match self.message_handler.route_handler.handle_node_announcement(&msg) {
816 Err(e) => { return Err(e.into()); },
820 // TODO: forward msg along to all our other peers!
823 wire::Message::ChannelUpdate(msg) => {
824 let should_forward = match self.message_handler.route_handler.handle_channel_update(&msg) {
826 Err(e) => { return Err(e.into()); },
830 // TODO: forward msg along to all our other peers!
833 wire::Message::QueryShortChannelIds(msg) => {
834 self.message_handler.route_handler.handle_query_short_channel_ids(&peer.their_node_id.unwrap(), msg)?;
836 wire::Message::ReplyShortChannelIdsEnd(msg) => {
837 self.message_handler.route_handler.handle_reply_short_channel_ids_end(&peer.their_node_id.unwrap(), msg)?;
839 wire::Message::QueryChannelRange(msg) => {
840 self.message_handler.route_handler.handle_query_channel_range(&peer.their_node_id.unwrap(), msg)?;
842 wire::Message::ReplyChannelRange(msg) => {
843 self.message_handler.route_handler.handle_reply_channel_range(&peer.their_node_id.unwrap(), msg)?;
845 wire::Message::GossipTimestampFilter(_msg) => {
846 // TODO: handle message
850 wire::Message::Unknown(msg_type) if msg_type.is_even() => {
851 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
852 // Fail the channel if message is an even, unknown type as per BOLT #1.
853 return Err(PeerHandleError{ no_connection_possible: true }.into());
855 wire::Message::Unknown(msg_type) => {
856 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
862 /// Checks for any events generated by our handlers and processes them. Includes sending most
863 /// response messages as well as messages generated by calls to handler functions directly (eg
864 /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
865 pub fn process_events(&self) {
867 // TODO: There are some DoS attacks here where you can flood someone's outbound send
868 // buffer by doing things like announcing channels on another node. We should be willing to
869 // drop optional-ish messages when send buffers get full!
871 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
872 events_generated.append(&mut self.message_handler.route_handler.get_and_clear_pending_msg_events());
873 let mut peers_lock = self.peers.lock().unwrap();
874 let peers = &mut *peers_lock;
875 for event in events_generated.drain(..) {
876 macro_rules! get_peer_for_forwarding {
877 ($node_id: expr, $handle_no_such_peer: block) => {
879 let descriptor = match peers.node_id_to_descriptor.get($node_id) {
880 Some(descriptor) => descriptor.clone(),
882 $handle_no_such_peer;
886 match peers.peers.get_mut(&descriptor) {
888 if peer.their_features.is_none() {
889 $handle_no_such_peer;
894 None => panic!("Inconsistent peers set state!"),
900 MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
901 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
902 log_pubkey!(node_id),
903 log_bytes!(msg.temporary_channel_id));
904 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
905 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
907 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
908 self.do_attempt_write_data(&mut descriptor, peer);
910 MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
911 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
912 log_pubkey!(node_id),
913 log_bytes!(msg.temporary_channel_id));
914 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
915 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
917 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
918 self.do_attempt_write_data(&mut descriptor, peer);
920 MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
921 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
922 log_pubkey!(node_id),
923 log_bytes!(msg.temporary_channel_id),
924 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
925 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
926 //TODO: generate a DiscardFunding event indicating to the wallet that
927 //they should just throw away this funding transaction
929 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
930 self.do_attempt_write_data(&mut descriptor, peer);
932 MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
933 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
934 log_pubkey!(node_id),
935 log_bytes!(msg.channel_id));
936 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
937 //TODO: generate a DiscardFunding event indicating to the wallet that
938 //they should just throw away this funding transaction
940 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
941 self.do_attempt_write_data(&mut descriptor, peer);
943 MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
944 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
945 log_pubkey!(node_id),
946 log_bytes!(msg.channel_id));
947 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
948 //TODO: Do whatever we're gonna do for handling dropped messages
950 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
951 self.do_attempt_write_data(&mut descriptor, peer);
953 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
954 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
955 log_pubkey!(node_id),
956 log_bytes!(msg.channel_id));
957 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
958 //TODO: generate a DiscardFunding event indicating to the wallet that
959 //they should just throw away this funding transaction
961 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
962 self.do_attempt_write_data(&mut descriptor, peer);
964 MessageSendEvent::UpdateHTLCs { ref node_id, updates: msgs::CommitmentUpdate { ref update_add_htlcs, ref update_fulfill_htlcs, ref update_fail_htlcs, ref update_fail_malformed_htlcs, ref update_fee, ref commitment_signed } } => {
965 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
966 log_pubkey!(node_id),
967 update_add_htlcs.len(),
968 update_fulfill_htlcs.len(),
969 update_fail_htlcs.len(),
970 log_bytes!(commitment_signed.channel_id));
971 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
972 //TODO: Do whatever we're gonna do for handling dropped messages
974 for msg in update_add_htlcs {
975 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
977 for msg in update_fulfill_htlcs {
978 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
980 for msg in update_fail_htlcs {
981 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
983 for msg in update_fail_malformed_htlcs {
984 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
986 if let &Some(ref msg) = update_fee {
987 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
989 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
990 self.do_attempt_write_data(&mut descriptor, peer);
992 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
993 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
994 log_pubkey!(node_id),
995 log_bytes!(msg.channel_id));
996 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
997 //TODO: Do whatever we're gonna do for handling dropped messages
999 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1000 self.do_attempt_write_data(&mut descriptor, peer);
1002 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
1003 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
1004 log_pubkey!(node_id),
1005 log_bytes!(msg.channel_id));
1006 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1007 //TODO: Do whatever we're gonna do for handling dropped messages
1009 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1010 self.do_attempt_write_data(&mut descriptor, peer);
1012 MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
1013 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
1014 log_pubkey!(node_id),
1015 log_bytes!(msg.channel_id));
1016 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1017 //TODO: Do whatever we're gonna do for handling dropped messages
1019 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1020 self.do_attempt_write_data(&mut descriptor, peer);
1022 MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
1023 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
1024 log_pubkey!(node_id),
1025 log_bytes!(msg.channel_id));
1026 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1027 //TODO: Do whatever we're gonna do for handling dropped messages
1029 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1030 self.do_attempt_write_data(&mut descriptor, peer);
1032 MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
1033 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1034 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
1035 let encoded_msg = encode_msg!(msg);
1036 let encoded_update_msg = encode_msg!(update_msg);
1038 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1039 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1040 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1043 match peer.their_node_id {
1045 Some(their_node_id) => {
1046 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
1051 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1052 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
1053 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1057 MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
1058 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
1059 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
1060 let encoded_msg = encode_msg!(msg);
1062 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1063 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1064 !peer.should_forward_node_announcement(msg.contents.node_id) {
1067 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1068 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1072 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1073 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1074 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1075 let encoded_msg = encode_msg!(msg);
1077 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1078 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1079 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1082 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1083 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1087 MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1088 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1090 MessageSendEvent::HandleError { ref node_id, ref action } => {
1092 msgs::ErrorAction::DisconnectPeer { ref msg } => {
1093 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1094 peers.peers_needing_send.remove(&descriptor);
1095 if let Some(mut peer) = peers.peers.remove(&descriptor) {
1096 if let Some(ref msg) = *msg {
1097 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1098 log_pubkey!(node_id),
1100 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1101 // This isn't guaranteed to work, but if there is enough free
1102 // room in the send buffer, put the error message there...
1103 self.do_attempt_write_data(&mut descriptor, &mut peer);
1105 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1108 descriptor.disconnect_socket();
1109 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1112 msgs::ErrorAction::IgnoreError => {},
1113 msgs::ErrorAction::SendErrorMessage { ref msg } => {
1114 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1115 log_pubkey!(node_id),
1117 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1118 //TODO: Do whatever we're gonna do for handling dropped messages
1120 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1121 self.do_attempt_write_data(&mut descriptor, peer);
1125 MessageSendEvent::SendChannelRangeQuery { ref node_id, ref msg } => {
1126 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1127 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1128 self.do_attempt_write_data(&mut descriptor, peer);
1130 MessageSendEvent::SendShortIdsQuery { ref node_id, ref msg } => {
1131 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {});
1132 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1133 self.do_attempt_write_data(&mut descriptor, peer);
1138 for mut descriptor in peers.peers_needing_send.drain() {
1139 match peers.peers.get_mut(&descriptor) {
1140 Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1141 None => panic!("Inconsistent peers set state!"),
1147 /// Indicates that the given socket descriptor's connection is now closed.
1149 /// This must only be called if the socket has been disconnected by the peer or your own
1150 /// decision to disconnect it and must NOT be called in any case where other parts of this
1151 /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1154 /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1155 pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1156 self.disconnect_event_internal(descriptor, false);
1159 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1160 let mut peers = self.peers.lock().unwrap();
1161 peers.peers_needing_send.remove(descriptor);
1162 let peer_option = peers.peers.remove(descriptor);
1164 None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1166 match peer.their_node_id {
1168 peers.node_id_to_descriptor.remove(&node_id);
1169 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1177 /// Disconnect a peer given its node id.
1179 /// Set no_connection_possible to true to prevent any further connection with this peer,
1180 /// force-closing any channels we have with it.
1182 /// If a peer is connected, this will call `disconnect_socket` on the descriptor for the peer,
1183 /// so be careful about reentrancy issues.
1184 pub fn disconnect_by_node_id(&self, node_id: PublicKey, no_connection_possible: bool) {
1185 let mut peers_lock = self.peers.lock().unwrap();
1186 if let Some(mut descriptor) = peers_lock.node_id_to_descriptor.remove(&node_id) {
1187 log_trace!(self.logger, "Disconnecting peer with id {} due to client request", node_id);
1188 peers_lock.peers.remove(&descriptor);
1189 peers_lock.peers_needing_send.remove(&descriptor);
1190 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1191 descriptor.disconnect_socket();
1195 /// This function should be called roughly once every 30 seconds.
1196 /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1198 /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1199 pub fn timer_tick_occured(&self) {
1200 let mut peers_lock = self.peers.lock().unwrap();
1202 let peers = &mut *peers_lock;
1203 let peers_needing_send = &mut peers.peers_needing_send;
1204 let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1205 let peers = &mut peers.peers;
1206 let mut descriptors_needing_disconnect = Vec::new();
1208 peers.retain(|descriptor, peer| {
1209 if peer.awaiting_pong {
1210 peers_needing_send.remove(descriptor);
1211 descriptors_needing_disconnect.push(descriptor.clone());
1212 match peer.their_node_id {
1214 log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1215 node_id_to_descriptor.remove(&node_id);
1216 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1219 // This can't actually happen as we should have hit
1220 // is_ready_for_encryption() previously on this same peer.
1227 if !peer.channel_encryptor.is_ready_for_encryption() {
1228 // The peer needs to complete its handshake before we can exchange messages
1232 let ping = msgs::Ping {
1236 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1238 let mut descriptor_clone = descriptor.clone();
1239 self.do_attempt_write_data(&mut descriptor_clone, peer);
1241 peer.awaiting_pong = true;
1245 for mut descriptor in descriptors_needing_disconnect.drain(..) {
1246 descriptor.disconnect_socket();
1254 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1257 use util::test_utils;
1259 use bitcoin::secp256k1::Secp256k1;
1260 use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1263 use std::sync::{Arc, Mutex};
1264 use std::sync::atomic::Ordering;
1267 struct FileDescriptor {
1269 outbound_data: Arc<Mutex<Vec<u8>>>,
1271 impl PartialEq for FileDescriptor {
1272 fn eq(&self, other: &Self) -> bool {
1276 impl Eq for FileDescriptor { }
1277 impl std::hash::Hash for FileDescriptor {
1278 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1279 self.fd.hash(hasher)
1283 impl SocketDescriptor for FileDescriptor {
1284 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1285 self.outbound_data.lock().unwrap().extend_from_slice(data);
1289 fn disconnect_socket(&mut self) {}
1292 struct PeerManagerCfg {
1293 chan_handler: test_utils::TestChannelMessageHandler,
1294 routing_handler: test_utils::TestRoutingMessageHandler,
1295 logger: test_utils::TestLogger,
1298 fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1299 let mut cfgs = Vec::new();
1300 for _ in 0..peer_count {
1303 chan_handler: test_utils::TestChannelMessageHandler::new(),
1304 logger: test_utils::TestLogger::new(),
1305 routing_handler: test_utils::TestRoutingMessageHandler::new(),
1313 fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>> {
1314 let mut peers = Vec::new();
1315 for i in 0..peer_count {
1316 let node_secret = SecretKey::from_slice(&[42 + i as u8; 32]).unwrap();
1317 let ephemeral_bytes = [i as u8; 32];
1318 let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: &cfgs[i].routing_handler };
1319 let peer = PeerManager::new(msg_handler, node_secret, &ephemeral_bytes, &cfgs[i].logger);
1326 fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestRoutingMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1327 let secp_ctx = Secp256k1::new();
1328 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1329 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1330 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1331 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1332 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1333 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1334 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1335 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1336 (fd_a.clone(), fd_b.clone())
1340 fn test_disconnect_peer() {
1341 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1342 // push a DisconnectPeer event to remove the node flagged by id
1343 let cfgs = create_peermgr_cfgs(2);
1344 let chan_handler = test_utils::TestChannelMessageHandler::new();
1345 let mut peers = create_network(2, &cfgs);
1346 establish_connection(&peers[0], &peers[1]);
1347 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1349 let secp_ctx = Secp256k1::new();
1350 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1352 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1354 action: msgs::ErrorAction::DisconnectPeer { msg: None },
1356 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1357 peers[0].message_handler.chan_handler = &chan_handler;
1359 peers[0].process_events();
1360 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1364 fn test_timer_tick_occurred() {
1365 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1366 let cfgs = create_peermgr_cfgs(2);
1367 let peers = create_network(2, &cfgs);
1368 establish_connection(&peers[0], &peers[1]);
1369 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1371 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1372 peers[0].timer_tick_occured();
1373 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1375 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1376 peers[0].timer_tick_occured();
1377 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1381 fn test_do_attempt_write_data() {
1382 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1383 let cfgs = create_peermgr_cfgs(2);
1384 cfgs[0].routing_handler.request_full_sync.store(true, Ordering::Release);
1385 cfgs[1].routing_handler.request_full_sync.store(true, Ordering::Release);
1386 let peers = create_network(2, &cfgs);
1388 // By calling establish_connect, we trigger do_attempt_write_data between
1389 // the peers. Previously this function would mistakenly enter an infinite loop
1390 // when there were more channel messages available than could fit into a peer's
1391 // buffer. This issue would now be detected by this test (because we use custom
1392 // RoutingMessageHandlers that intentionally return more channel messages
1393 // than can fit into a peer's buffer).
1394 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1396 // Make each peer to read the messages that the other peer just wrote to them.
1397 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1398 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1400 // Check that each peer has received the expected number of channel updates and channel
1402 assert_eq!(cfgs[0].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1403 assert_eq!(cfgs[0].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);
1404 assert_eq!(cfgs[1].routing_handler.chan_upds_recvd.load(Ordering::Acquire), 100);
1405 assert_eq!(cfgs[1].routing_handler.chan_anns_recvd.load(Ordering::Acquire), 50);