1 //! Top level peer message handling and socket handling logic lives here.
3 //! Instead of actually servicing sockets ourselves we require that you implement the
4 //! SocketDescriptor interface and use that to receive actions which you should perform on the
5 //! socket, and call into PeerManager with bytes read from the socket. The PeerManager will then
6 //! call into the provided message handlers (probably a ChannelManager and NetGraphmsgHandler) with messages
7 //! they should handle, and encoding/sending response messages.
9 use bitcoin::secp256k1::key::{SecretKey,PublicKey};
11 use ln::features::InitFeatures;
13 use ln::msgs::ChannelMessageHandler;
14 use ln::channelmanager::{SimpleArcChannelManager, SimpleRefChannelManager};
15 use util::ser::VecWriter;
16 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
20 use util::events::{MessageSendEvent, MessageSendEventsProvider};
21 use util::logger::Logger;
23 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
24 use std::sync::{Arc, Mutex};
25 use std::sync::atomic::{AtomicUsize, Ordering};
26 use std::{cmp,error,hash,fmt};
29 use bitcoin::hashes::sha256::Hash as Sha256;
30 use bitcoin::hashes::sha256::HashEngine as Sha256Engine;
31 use bitcoin::hashes::{HashEngine, Hash};
33 /// Provides references to trait impls which handle different types of messages.
34 pub struct MessageHandler<CM: Deref> where CM::Target: msgs::ChannelMessageHandler {
35 /// A message handler which handles messages specific to channels. Usually this is just a
36 /// ChannelManager object.
38 /// A message handler which handles messages updating our knowledge of the network channel
39 /// graph. Usually this is just a NetGraphMsgHandlerMonitor object.
40 pub route_handler: Arc<msgs::RoutingMessageHandler>,
43 /// Provides an object which can be used to send data to and which uniquely identifies a connection
44 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
45 /// implement Hash to meet the PeerManager API.
47 /// For efficiency, Clone should be relatively cheap for this type.
49 /// You probably want to just extend an int and put a file descriptor in a struct and implement
50 /// send_data. Note that if you are using a higher-level net library that may call close() itself,
51 /// be careful to ensure you don't have races whereby you might register a new connection with an
52 /// fd which is the same as a previous one which has yet to be removed via
53 /// PeerManager::socket_disconnected().
54 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
55 /// Attempts to send some data from the given slice to the peer.
57 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
58 /// Note that in the disconnected case, socket_disconnected must still fire and further write
59 /// attempts may occur until that time.
61 /// If the returned size is smaller than data.len(), a write_available event must
62 /// trigger the next time more data can be written. Additionally, until the a send_data event
63 /// completes fully, no further read_events should trigger on the same peer!
65 /// If a read_event on this descriptor had previously returned true (indicating that read
66 /// events should be paused to prevent DoS in the send buffer), resume_read may be set
67 /// indicating that read events on this descriptor should resume. A resume_read of false does
68 /// *not* imply that further read events should be paused.
69 fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize;
70 /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
71 /// more calls to write_buffer_space_avail, read_event or socket_disconnected may be made with
72 /// this descriptor. No socket_disconnected call should be generated as a result of this call,
73 /// though races may occur whereby disconnect_socket is called after a call to
74 /// socket_disconnected but prior to socket_disconnected returning.
75 fn disconnect_socket(&mut self);
78 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
79 /// generate no further read_event/write_buffer_space_avail calls for the descriptor, only
80 /// triggering a single socket_disconnected call (unless it was provided in response to a
81 /// new_*_connection event, in which case no such socket_disconnected() must be called and the
82 /// socket silently disconencted).
83 pub struct PeerHandleError {
84 /// Used to indicate that we probably can't make any future connections to this peer, implying
85 /// we should go ahead and force-close any channels we have with it.
86 no_connection_possible: bool,
88 impl fmt::Debug for PeerHandleError {
89 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
90 formatter.write_str("Peer Sent Invalid Data")
93 impl fmt::Display for PeerHandleError {
94 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
95 formatter.write_str("Peer Sent Invalid Data")
98 impl error::Error for PeerHandleError {
99 fn description(&self) -> &str {
100 "Peer Sent Invalid Data"
104 enum InitSyncTracker{
106 ChannelsSyncing(u64),
107 NodesSyncing(PublicKey),
111 channel_encryptor: PeerChannelEncryptor,
113 their_node_id: Option<PublicKey>,
114 their_features: Option<InitFeatures>,
116 pending_outbound_buffer: LinkedList<Vec<u8>>,
117 pending_outbound_buffer_first_msg_offset: usize,
118 awaiting_write_event: bool,
120 pending_read_buffer: Vec<u8>,
121 pending_read_buffer_pos: usize,
122 pending_read_is_header: bool,
124 sync_status: InitSyncTracker,
130 /// Returns true if the channel announcements/updates for the given channel should be
131 /// forwarded to this peer.
132 /// If we are sending our routing table to this peer and we have not yet sent channel
133 /// announcements/updates for the given channel_id then we will send it when we get to that
134 /// point and we shouldn't send it yet to avoid sending duplicate updates. If we've already
135 /// sent the old versions, we should send the update, and so return true here.
136 fn should_forward_channel_announcement(&self, channel_id: u64)->bool{
137 match self.sync_status {
138 InitSyncTracker::NoSyncRequested => true,
139 InitSyncTracker::ChannelsSyncing(i) => i < channel_id,
140 InitSyncTracker::NodesSyncing(_) => true,
144 /// Similar to the above, but for node announcements indexed by node_id.
145 fn should_forward_node_announcement(&self, node_id: PublicKey) -> bool {
146 match self.sync_status {
147 InitSyncTracker::NoSyncRequested => true,
148 InitSyncTracker::ChannelsSyncing(_) => false,
149 InitSyncTracker::NodesSyncing(pk) => pk < node_id,
154 struct PeerHolder<Descriptor: SocketDescriptor> {
155 peers: HashMap<Descriptor, Peer>,
156 /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
157 /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
158 peers_needing_send: HashSet<Descriptor>,
159 /// Only add to this set when noise completes:
160 node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
163 #[cfg(not(any(target_pointer_width = "32", target_pointer_width = "64")))]
164 fn _check_usize_is_32_or_64() {
165 // See below, less than 32 bit pointers may be unsafe here!
166 unsafe { mem::transmute::<*const usize, [u8; 4]>(panic!()); }
169 /// SimpleArcPeerManager is useful when you need a PeerManager with a static lifetime, e.g.
170 /// when you're using lightning-net-tokio (since tokio::spawn requires parameters with static
171 /// lifetimes). Other times you can afford a reference, which is more efficient, in which case
172 /// SimpleRefPeerManager is the more appropriate type. Defining these type aliases prevents
173 /// issues such as overly long function definitions.
174 pub type SimpleArcPeerManager<SD, M, T, F, L> = Arc<PeerManager<SD, SimpleArcChannelManager<M, T, F, L>, Arc<L>>>;
176 /// SimpleRefPeerManager is a type alias for a PeerManager reference, and is the reference
177 /// counterpart to the SimpleArcPeerManager type alias. Use this type by default when you don't
178 /// need a PeerManager with a static lifetime. You'll need a static lifetime in cases such as
179 /// usage of lightning-net-tokio (since tokio::spawn requires parameters with static lifetimes).
180 /// But if this is not necessary, using a reference is more efficient. Defining these type aliases
181 /// helps with issues such as long function definitions.
182 pub type SimpleRefPeerManager<'a, 'b, 'c, 'd, 'e, SD, M, T, F, L> = PeerManager<SD, SimpleRefChannelManager<'a, 'b, 'c, 'd, 'e, M, T, F, L>, &'e L>;
184 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
185 /// events into messages which it passes on to its MessageHandlers.
187 /// Rather than using a plain PeerManager, it is preferable to use either a SimpleArcPeerManager
188 /// a SimpleRefPeerManager, for conciseness. See their documentation for more details, but
189 /// essentially you should default to using a SimpleRefPeerManager, and use a
190 /// SimpleArcPeerManager when you require a PeerManager with a static lifetime, such as when
191 /// you're using lightning-net-tokio.
192 pub struct PeerManager<Descriptor: SocketDescriptor, CM: Deref, L: Deref> where CM::Target: msgs::ChannelMessageHandler, L::Target: Logger {
193 message_handler: MessageHandler<CM>,
194 peers: Mutex<PeerHolder<Descriptor>>,
195 our_node_secret: SecretKey,
196 ephemeral_key_midstate: Sha256Engine,
198 // Usize needs to be at least 32 bits to avoid overflowing both low and high. If usize is 64
199 // bits we will never realistically count into high:
200 peer_counter_low: AtomicUsize,
201 peer_counter_high: AtomicUsize,
206 macro_rules! encode_msg {
208 let mut buffer = VecWriter(Vec::new());
209 wire::write($msg, &mut buffer).unwrap();
214 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
215 /// PeerIds may repeat, but only after socket_disconnected() has been called.
216 impl<Descriptor: SocketDescriptor, CM: Deref, L: Deref> PeerManager<Descriptor, CM, L> where CM::Target: msgs::ChannelMessageHandler, L::Target: Logger {
217 /// Constructs a new PeerManager with the given message handlers and node_id secret key
218 /// ephemeral_random_data is used to derive per-connection ephemeral keys and must be
219 /// cryptographically secure random bytes.
220 pub fn new(message_handler: MessageHandler<CM>, our_node_secret: SecretKey, ephemeral_random_data: &[u8; 32], logger: L) -> PeerManager<Descriptor, CM, L> {
221 let mut ephemeral_key_midstate = Sha256::engine();
222 ephemeral_key_midstate.input(ephemeral_random_data);
226 peers: Mutex::new(PeerHolder {
227 peers: HashMap::new(),
228 peers_needing_send: HashSet::new(),
229 node_id_to_descriptor: HashMap::new()
232 ephemeral_key_midstate,
233 peer_counter_low: AtomicUsize::new(0),
234 peer_counter_high: AtomicUsize::new(0),
239 /// Get the list of node ids for peers which have completed the initial handshake.
241 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
242 /// new_outbound_connection, however entries will only appear once the initial handshake has
243 /// completed and we are sure the remote peer has the private key for the given node_id.
244 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
245 let peers = self.peers.lock().unwrap();
246 peers.peers.values().filter_map(|p| {
247 if !p.channel_encryptor.is_ready_for_encryption() || p.their_features.is_none() {
254 fn get_ephemeral_key(&self) -> SecretKey {
255 let mut ephemeral_hash = self.ephemeral_key_midstate.clone();
256 let low = self.peer_counter_low.fetch_add(1, Ordering::AcqRel);
257 let high = if low == 0 {
258 self.peer_counter_high.fetch_add(1, Ordering::AcqRel)
260 self.peer_counter_high.load(Ordering::Acquire)
262 ephemeral_hash.input(&byte_utils::le64_to_array(low as u64));
263 ephemeral_hash.input(&byte_utils::le64_to_array(high as u64));
264 SecretKey::from_slice(&Sha256::from_engine(ephemeral_hash).into_inner()).expect("You broke SHA-256!")
267 /// Indicates a new outbound connection has been established to a node with the given node_id.
268 /// Note that if an Err is returned here you MUST NOT call socket_disconnected for the new
269 /// descriptor but must disconnect the connection immediately.
271 /// Returns a small number of bytes to send to the remote node (currently always 50).
273 /// Panics if descriptor is duplicative with some other descriptor which has not yet had a
274 /// socket_disconnected().
275 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
276 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone(), self.get_ephemeral_key());
277 let res = peer_encryptor.get_act_one().to_vec();
278 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
280 let mut peers = self.peers.lock().unwrap();
281 if peers.peers.insert(descriptor, Peer {
282 channel_encryptor: peer_encryptor,
285 their_features: None,
287 pending_outbound_buffer: LinkedList::new(),
288 pending_outbound_buffer_first_msg_offset: 0,
289 awaiting_write_event: false,
291 pending_read_buffer: pending_read_buffer,
292 pending_read_buffer_pos: 0,
293 pending_read_is_header: false,
295 sync_status: InitSyncTracker::NoSyncRequested,
297 awaiting_pong: false,
299 panic!("PeerManager driver duplicated descriptors!");
304 /// Indicates a new inbound connection has been established.
306 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
307 /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
308 /// call socket_disconnected for the new descriptor but must disconnect the connection
311 /// Panics if descriptor is duplicative with some other descriptor which has not yet had
312 /// socket_disconnected called.
313 pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
314 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
315 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
317 let mut peers = self.peers.lock().unwrap();
318 if peers.peers.insert(descriptor, Peer {
319 channel_encryptor: peer_encryptor,
322 their_features: None,
324 pending_outbound_buffer: LinkedList::new(),
325 pending_outbound_buffer_first_msg_offset: 0,
326 awaiting_write_event: false,
328 pending_read_buffer: pending_read_buffer,
329 pending_read_buffer_pos: 0,
330 pending_read_is_header: false,
332 sync_status: InitSyncTracker::NoSyncRequested,
334 awaiting_pong: false,
336 panic!("PeerManager driver duplicated descriptors!");
341 fn do_attempt_write_data(&self, descriptor: &mut Descriptor, peer: &mut Peer) {
342 macro_rules! encode_and_send_msg {
345 log_trace!(self.logger, "Encoding and sending sync update message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
346 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg)[..]));
350 const MSG_BUFF_SIZE: usize = 10;
351 while !peer.awaiting_write_event {
352 if peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE {
353 match peer.sync_status {
354 InitSyncTracker::NoSyncRequested => {},
355 InitSyncTracker::ChannelsSyncing(c) if c < 0xffff_ffff_ffff_ffff => {
356 let steps = ((MSG_BUFF_SIZE - peer.pending_outbound_buffer.len() + 2) / 3) as u8;
357 let all_messages = self.message_handler.route_handler.get_next_channel_announcements(c, steps);
358 for &(ref announce, ref update_a_option, ref update_b_option) in all_messages.iter() {
359 encode_and_send_msg!(announce);
360 if let &Some(ref update_a) = update_a_option {
361 encode_and_send_msg!(update_a);
363 if let &Some(ref update_b) = update_b_option {
364 encode_and_send_msg!(update_b);
366 peer.sync_status = InitSyncTracker::ChannelsSyncing(announce.contents.short_channel_id + 1);
368 if all_messages.is_empty() || all_messages.len() != steps as usize {
369 peer.sync_status = InitSyncTracker::ChannelsSyncing(0xffff_ffff_ffff_ffff);
372 InitSyncTracker::ChannelsSyncing(c) if c == 0xffff_ffff_ffff_ffff => {
373 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
374 let all_messages = self.message_handler.route_handler.get_next_node_announcements(None, steps);
375 for msg in all_messages.iter() {
376 encode_and_send_msg!(msg);
377 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
379 if all_messages.is_empty() || all_messages.len() != steps as usize {
380 peer.sync_status = InitSyncTracker::NoSyncRequested;
383 InitSyncTracker::ChannelsSyncing(_) => unreachable!(),
384 InitSyncTracker::NodesSyncing(key) => {
385 let steps = (MSG_BUFF_SIZE - peer.pending_outbound_buffer.len()) as u8;
386 let all_messages = self.message_handler.route_handler.get_next_node_announcements(Some(&key), steps);
387 for msg in all_messages.iter() {
388 encode_and_send_msg!(msg);
389 peer.sync_status = InitSyncTracker::NodesSyncing(msg.contents.node_id);
391 if all_messages.is_empty() || all_messages.len() != steps as usize {
392 peer.sync_status = InitSyncTracker::NoSyncRequested;
399 let next_buff = match peer.pending_outbound_buffer.front() {
404 let should_be_reading = peer.pending_outbound_buffer.len() < MSG_BUFF_SIZE;
405 let pending = &next_buff[peer.pending_outbound_buffer_first_msg_offset..];
406 let data_sent = descriptor.send_data(pending, should_be_reading);
407 peer.pending_outbound_buffer_first_msg_offset += data_sent;
408 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
410 peer.pending_outbound_buffer_first_msg_offset = 0;
411 peer.pending_outbound_buffer.pop_front();
413 peer.awaiting_write_event = true;
418 /// Indicates that there is room to write data to the given socket descriptor.
420 /// May return an Err to indicate that the connection should be closed.
422 /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
423 /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
424 /// invariants around calling write_buffer_space_avail in case a write did not fully complete
425 /// must still hold - be ready to call write_buffer_space_avail again if a write call generated
426 /// here isn't sufficient! Panics if the descriptor was not previously registered in a
427 /// new_\*_connection event.
428 pub fn write_buffer_space_avail(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
429 let mut peers = self.peers.lock().unwrap();
430 match peers.peers.get_mut(descriptor) {
431 None => panic!("Descriptor for write_event is not already known to PeerManager"),
433 peer.awaiting_write_event = false;
434 self.do_attempt_write_data(descriptor, peer);
440 /// Indicates that data was read from the given socket descriptor.
442 /// May return an Err to indicate that the connection should be closed.
444 /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
445 /// Thus, however, you almost certainly want to call process_events() after any read_event to
446 /// generate send_data calls to handle responses.
448 /// If Ok(true) is returned, further read_events should not be triggered until a send_data call
449 /// on this file descriptor has resume_read set (preventing DoS issues in the send buffer).
451 /// Panics if the descriptor was not previously registered in a new_*_connection event.
452 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
453 match self.do_read_event(peer_descriptor, data) {
456 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
462 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: &[u8]) -> Result<bool, PeerHandleError> {
464 let mut peers_lock = self.peers.lock().unwrap();
465 let peers = &mut *peers_lock;
466 let pause_read = match peers.peers.get_mut(peer_descriptor) {
467 None => panic!("Descriptor for read_event is not already known to PeerManager"),
469 assert!(peer.pending_read_buffer.len() > 0);
470 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
472 let mut read_pos = 0;
473 while read_pos < data.len() {
475 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
476 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]);
477 read_pos += data_to_copy;
478 peer.pending_read_buffer_pos += data_to_copy;
481 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
482 peer.pending_read_buffer_pos = 0;
484 macro_rules! encode_and_send_msg {
487 log_trace!(self.logger, "Encoding and sending message of type {} to {}", $msg.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
488 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&$msg)[..]));
489 peers.peers_needing_send.insert(peer_descriptor.clone());
494 macro_rules! try_potential_handleerror {
500 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
501 //TODO: Try to push msg
502 log_trace!(self.logger, "Got Err handling message, disconnecting peer because {}", e.err);
503 return Err(PeerHandleError{ no_connection_possible: false });
505 msgs::ErrorAction::IgnoreError => {
506 log_trace!(self.logger, "Got Err handling message, ignoring because {}", e.err);
509 msgs::ErrorAction::SendErrorMessage { msg } => {
510 log_trace!(self.logger, "Got Err handling message, sending Error message because {}", e.err);
511 encode_and_send_msg!(msg);
520 macro_rules! insert_node_id {
522 match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
523 hash_map::Entry::Occupied(_) => {
524 log_trace!(self.logger, "Got second connection with {}, closing", log_pubkey!(peer.their_node_id.unwrap()));
525 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
526 return Err(PeerHandleError{ no_connection_possible: false })
528 hash_map::Entry::Vacant(entry) => {
529 log_trace!(self.logger, "Finished noise handshake for connection with {}", log_pubkey!(peer.their_node_id.unwrap()));
530 entry.insert(peer_descriptor.clone())
536 let next_step = peer.channel_encryptor.get_noise_step();
538 NextNoiseStep::ActOne => {
539 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();
540 peer.pending_outbound_buffer.push_back(act_two);
541 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
543 NextNoiseStep::ActTwo => {
544 let (act_three, their_node_id) = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret));
545 peer.pending_outbound_buffer.push_back(act_three.to_vec());
546 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
547 peer.pending_read_is_header = true;
549 peer.their_node_id = Some(their_node_id);
551 let mut features = InitFeatures::known();
552 if !self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
553 features.clear_initial_routing_sync();
556 let resp = msgs::Init { features };
557 encode_and_send_msg!(resp);
559 NextNoiseStep::ActThree => {
560 let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
561 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
562 peer.pending_read_is_header = true;
563 peer.their_node_id = Some(their_node_id);
566 NextNoiseStep::NoiseComplete => {
567 if peer.pending_read_is_header {
568 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
569 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
570 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
571 if msg_len < 2 { // Need at least the message type tag
572 return Err(PeerHandleError{ no_connection_possible: false });
574 peer.pending_read_is_header = false;
576 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
577 assert!(msg_data.len() >= 2);
580 peer.pending_read_buffer = [0; 18].to_vec();
581 peer.pending_read_is_header = true;
583 let mut reader = ::std::io::Cursor::new(&msg_data[..]);
584 let message_result = wire::read(&mut reader);
585 let message = match message_result {
589 msgs::DecodeError::UnknownVersion => return Err(PeerHandleError { no_connection_possible: false }),
590 msgs::DecodeError::UnknownRequiredFeature => {
591 log_debug!(self.logger, "Got a channel/node announcement with an known required feature flag, you may want to update!");
594 msgs::DecodeError::InvalidValue => {
595 log_debug!(self.logger, "Got an invalid value while deserializing message");
596 return Err(PeerHandleError { no_connection_possible: false });
598 msgs::DecodeError::ShortRead => {
599 log_debug!(self.logger, "Deserialization failed due to shortness of message");
600 return Err(PeerHandleError { no_connection_possible: false });
602 msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError { no_connection_possible: false }),
603 msgs::DecodeError::Io(_) => return Err(PeerHandleError { no_connection_possible: false }),
608 log_trace!(self.logger, "Received message of type {} from {}", message.type_id(), log_pubkey!(peer.their_node_id.unwrap()));
610 // Need an Init as first message
611 if let wire::Message::Init(_) = message {
612 } else if peer.their_features.is_none() {
613 log_trace!(self.logger, "Peer {} sent non-Init first message", log_pubkey!(peer.their_node_id.unwrap()));
614 return Err(PeerHandleError{ no_connection_possible: false });
618 // Setup and Control messages:
619 wire::Message::Init(msg) => {
620 if msg.features.requires_unknown_bits() {
621 log_info!(self.logger, "Peer global features required unknown version bits");
622 return Err(PeerHandleError{ no_connection_possible: true });
624 if msg.features.requires_unknown_bits() {
625 log_info!(self.logger, "Peer local features required unknown version bits");
626 return Err(PeerHandleError{ no_connection_possible: true });
628 if peer.their_features.is_some() {
629 return Err(PeerHandleError{ no_connection_possible: false });
632 log_info!(self.logger, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, static_remote_key: {}, unkown local flags: {}, unknown global flags: {}",
633 if msg.features.supports_data_loss_protect() { "supported" } else { "not supported"},
634 if msg.features.initial_routing_sync() { "requested" } else { "not requested" },
635 if msg.features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
636 if msg.features.supports_static_remote_key() { "supported" } else { "not supported"},
637 if msg.features.supports_unknown_bits() { "present" } else { "none" },
638 if msg.features.supports_unknown_bits() { "present" } else { "none" });
640 if msg.features.initial_routing_sync() {
641 peer.sync_status = InitSyncTracker::ChannelsSyncing(0);
642 peers.peers_needing_send.insert(peer_descriptor.clone());
644 if !msg.features.supports_static_remote_key() {
645 log_debug!(self.logger, "Peer {} does not support static remote key, disconnecting with no_connection_possible", log_pubkey!(peer.their_node_id.unwrap()));
646 return Err(PeerHandleError{ no_connection_possible: true });
650 let mut features = InitFeatures::known();
651 if !self.message_handler.route_handler.should_request_full_sync(&peer.their_node_id.unwrap()) {
652 features.clear_initial_routing_sync();
655 let resp = msgs::Init { features };
656 encode_and_send_msg!(resp);
659 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap(), &msg);
660 peer.their_features = Some(msg.features);
662 wire::Message::Error(msg) => {
663 let mut data_is_printable = true;
664 for b in msg.data.bytes() {
665 if b < 32 || b > 126 {
666 data_is_printable = false;
671 if data_is_printable {
672 log_debug!(self.logger, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
674 log_debug!(self.logger, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
676 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
677 if msg.channel_id == [0; 32] {
678 return Err(PeerHandleError{ no_connection_possible: true });
682 wire::Message::Ping(msg) => {
683 if msg.ponglen < 65532 {
684 let resp = msgs::Pong { byteslen: msg.ponglen };
685 encode_and_send_msg!(resp);
688 wire::Message::Pong(_msg) => {
689 peer.awaiting_pong = false;
693 wire::Message::OpenChannel(msg) => {
694 self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
696 wire::Message::AcceptChannel(msg) => {
697 self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), peer.their_features.clone().unwrap(), &msg);
700 wire::Message::FundingCreated(msg) => {
701 self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg);
703 wire::Message::FundingSigned(msg) => {
704 self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg);
706 wire::Message::FundingLocked(msg) => {
707 self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg);
710 wire::Message::Shutdown(msg) => {
711 self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg);
713 wire::Message::ClosingSigned(msg) => {
714 self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg);
717 // Commitment messages:
718 wire::Message::UpdateAddHTLC(msg) => {
719 self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg);
721 wire::Message::UpdateFulfillHTLC(msg) => {
722 self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg);
724 wire::Message::UpdateFailHTLC(msg) => {
725 self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg);
727 wire::Message::UpdateFailMalformedHTLC(msg) => {
728 self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg);
731 wire::Message::CommitmentSigned(msg) => {
732 self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg);
734 wire::Message::RevokeAndACK(msg) => {
735 self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg);
737 wire::Message::UpdateFee(msg) => {
738 self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg);
740 wire::Message::ChannelReestablish(msg) => {
741 self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg);
745 wire::Message::AnnouncementSignatures(msg) => {
746 self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg);
748 wire::Message::ChannelAnnouncement(msg) => {
749 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
752 // TODO: forward msg along to all our other peers!
755 wire::Message::NodeAnnouncement(msg) => {
756 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
759 // TODO: forward msg along to all our other peers!
762 wire::Message::ChannelUpdate(msg) => {
763 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
766 // TODO: forward msg along to all our other peers!
771 wire::Message::Unknown(msg_type) if msg_type.is_even() => {
772 log_debug!(self.logger, "Received unknown even message of type {}, disconnecting peer!", msg_type);
773 // Fail the channel if message is an even, unknown type as per BOLT #1.
774 return Err(PeerHandleError{ no_connection_possible: true });
776 wire::Message::Unknown(msg_type) => {
777 log_trace!(self.logger, "Received unknown odd message of type {}, ignoring", msg_type);
786 self.do_attempt_write_data(peer_descriptor, peer);
788 peer.pending_outbound_buffer.len() > 10 // pause_read
798 /// Checks for any events generated by our handlers and processes them. Includes sending most
799 /// response messages as well as messages generated by calls to handler functions directly (eg
800 /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
801 pub fn process_events(&self) {
803 // TODO: There are some DoS attacks here where you can flood someone's outbound send
804 // buffer by doing things like announcing channels on another node. We should be willing to
805 // drop optional-ish messages when send buffers get full!
807 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
808 let mut peers_lock = self.peers.lock().unwrap();
809 let peers = &mut *peers_lock;
810 for event in events_generated.drain(..) {
811 macro_rules! get_peer_for_forwarding {
812 ($node_id: expr, $handle_no_such_peer: block) => {
814 let descriptor = match peers.node_id_to_descriptor.get($node_id) {
815 Some(descriptor) => descriptor.clone(),
817 $handle_no_such_peer;
821 match peers.peers.get_mut(&descriptor) {
823 if peer.their_features.is_none() {
824 $handle_no_such_peer;
829 None => panic!("Inconsistent peers set state!"),
835 MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
836 log_trace!(self.logger, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
837 log_pubkey!(node_id),
838 log_bytes!(msg.temporary_channel_id));
839 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
840 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
842 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
843 self.do_attempt_write_data(&mut descriptor, peer);
845 MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
846 log_trace!(self.logger, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
847 log_pubkey!(node_id),
848 log_bytes!(msg.temporary_channel_id));
849 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
850 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
852 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
853 self.do_attempt_write_data(&mut descriptor, peer);
855 MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
856 log_trace!(self.logger, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
857 log_pubkey!(node_id),
858 log_bytes!(msg.temporary_channel_id),
859 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
860 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
861 //TODO: generate a DiscardFunding event indicating to the wallet that
862 //they should just throw away this funding transaction
864 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
865 self.do_attempt_write_data(&mut descriptor, peer);
867 MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
868 log_trace!(self.logger, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
869 log_pubkey!(node_id),
870 log_bytes!(msg.channel_id));
871 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
872 //TODO: generate a DiscardFunding event indicating to the wallet that
873 //they should just throw away this funding transaction
875 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
876 self.do_attempt_write_data(&mut descriptor, peer);
878 MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
879 log_trace!(self.logger, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
880 log_pubkey!(node_id),
881 log_bytes!(msg.channel_id));
882 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
883 //TODO: Do whatever we're gonna do for handling dropped messages
885 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
886 self.do_attempt_write_data(&mut descriptor, peer);
888 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
889 log_trace!(self.logger, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
890 log_pubkey!(node_id),
891 log_bytes!(msg.channel_id));
892 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
893 //TODO: generate a DiscardFunding event indicating to the wallet that
894 //they should just throw away this funding transaction
896 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
897 self.do_attempt_write_data(&mut descriptor, peer);
899 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 } } => {
900 log_trace!(self.logger, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
901 log_pubkey!(node_id),
902 update_add_htlcs.len(),
903 update_fulfill_htlcs.len(),
904 update_fail_htlcs.len(),
905 log_bytes!(commitment_signed.channel_id));
906 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
907 //TODO: Do whatever we're gonna do for handling dropped messages
909 for msg in update_add_htlcs {
910 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
912 for msg in update_fulfill_htlcs {
913 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
915 for msg in update_fail_htlcs {
916 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
918 for msg in update_fail_malformed_htlcs {
919 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
921 if let &Some(ref msg) = update_fee {
922 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
924 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed)));
925 self.do_attempt_write_data(&mut descriptor, peer);
927 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
928 log_trace!(self.logger, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
929 log_pubkey!(node_id),
930 log_bytes!(msg.channel_id));
931 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
932 //TODO: Do whatever we're gonna do for handling dropped messages
934 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
935 self.do_attempt_write_data(&mut descriptor, peer);
937 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
938 log_trace!(self.logger, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
939 log_pubkey!(node_id),
940 log_bytes!(msg.channel_id));
941 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
942 //TODO: Do whatever we're gonna do for handling dropped messages
944 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
945 self.do_attempt_write_data(&mut descriptor, peer);
947 MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
948 log_trace!(self.logger, "Handling Shutdown event in peer_handler for node {} for channel {}",
949 log_pubkey!(node_id),
950 log_bytes!(msg.channel_id));
951 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
952 //TODO: Do whatever we're gonna do for handling dropped messages
954 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
955 self.do_attempt_write_data(&mut descriptor, peer);
957 MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
958 log_trace!(self.logger, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
959 log_pubkey!(node_id),
960 log_bytes!(msg.channel_id));
961 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
962 //TODO: Do whatever we're gonna do for handling dropped messages
964 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
965 self.do_attempt_write_data(&mut descriptor, peer);
967 MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
968 log_trace!(self.logger, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
969 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
970 let encoded_msg = encode_msg!(msg);
971 let encoded_update_msg = encode_msg!(update_msg);
973 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
974 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
975 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
978 match peer.their_node_id {
980 Some(their_node_id) => {
981 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
986 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
987 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
988 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
992 MessageSendEvent::BroadcastNodeAnnouncement { ref msg } => {
993 log_trace!(self.logger, "Handling BroadcastNodeAnnouncement event in peer_handler");
994 if self.message_handler.route_handler.handle_node_announcement(msg).is_ok() {
995 let encoded_msg = encode_msg!(msg);
997 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
998 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
999 !peer.should_forward_node_announcement(msg.contents.node_id) {
1002 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1003 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1007 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
1008 log_trace!(self.logger, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
1009 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
1010 let encoded_msg = encode_msg!(msg);
1012 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
1013 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_features.is_none() ||
1014 !peer.should_forward_channel_announcement(msg.contents.short_channel_id) {
1017 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
1018 self.do_attempt_write_data(&mut (*descriptor).clone(), peer);
1022 MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
1023 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
1025 MessageSendEvent::HandleError { ref node_id, ref action } => {
1027 msgs::ErrorAction::DisconnectPeer { ref msg } => {
1028 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
1029 peers.peers_needing_send.remove(&descriptor);
1030 if let Some(mut peer) = peers.peers.remove(&descriptor) {
1031 if let Some(ref msg) = *msg {
1032 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
1033 log_pubkey!(node_id),
1035 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1036 // This isn't guaranteed to work, but if there is enough free
1037 // room in the send buffer, put the error message there...
1038 self.do_attempt_write_data(&mut descriptor, &mut peer);
1040 log_trace!(self.logger, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
1043 descriptor.disconnect_socket();
1044 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1047 msgs::ErrorAction::IgnoreError => {},
1048 msgs::ErrorAction::SendErrorMessage { ref msg } => {
1049 log_trace!(self.logger, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
1050 log_pubkey!(node_id),
1052 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
1053 //TODO: Do whatever we're gonna do for handling dropped messages
1055 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg)));
1056 self.do_attempt_write_data(&mut descriptor, peer);
1063 for mut descriptor in peers.peers_needing_send.drain() {
1064 match peers.peers.get_mut(&descriptor) {
1065 Some(peer) => self.do_attempt_write_data(&mut descriptor, peer),
1066 None => panic!("Inconsistent peers set state!"),
1072 /// Indicates that the given socket descriptor's connection is now closed.
1074 /// This must only be called if the socket has been disconnected by the peer or your own
1075 /// decision to disconnect it and must NOT be called in any case where other parts of this
1076 /// library (eg PeerHandleError, explicit disconnect_socket calls) instruct you to disconnect
1079 /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
1080 pub fn socket_disconnected(&self, descriptor: &Descriptor) {
1081 self.disconnect_event_internal(descriptor, false);
1084 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
1085 let mut peers = self.peers.lock().unwrap();
1086 peers.peers_needing_send.remove(descriptor);
1087 let peer_option = peers.peers.remove(descriptor);
1089 None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
1091 match peer.their_node_id {
1093 peers.node_id_to_descriptor.remove(&node_id);
1094 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
1102 /// This function should be called roughly once every 30 seconds.
1103 /// It will send pings to each peer and disconnect those which did not respond to the last round of pings.
1105 /// Will most likely call send_data on all of the registered descriptors, thus, be very careful with reentrancy issues!
1106 pub fn timer_tick_occured(&self) {
1107 let mut peers_lock = self.peers.lock().unwrap();
1109 let peers = &mut *peers_lock;
1110 let peers_needing_send = &mut peers.peers_needing_send;
1111 let node_id_to_descriptor = &mut peers.node_id_to_descriptor;
1112 let peers = &mut peers.peers;
1113 let mut descriptors_needing_disconnect = Vec::new();
1115 peers.retain(|descriptor, peer| {
1116 if peer.awaiting_pong {
1117 peers_needing_send.remove(descriptor);
1118 descriptors_needing_disconnect.push(descriptor.clone());
1119 match peer.their_node_id {
1121 log_trace!(self.logger, "Disconnecting peer with id {} due to ping timeout", node_id);
1122 node_id_to_descriptor.remove(&node_id);
1123 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
1126 // This can't actually happen as we should have hit
1127 // is_ready_for_encryption() previously on this same peer.
1134 if !peer.channel_encryptor.is_ready_for_encryption() {
1135 // The peer needs to complete its handshake before we can exchange messages
1139 let ping = msgs::Ping {
1143 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(&ping)));
1145 let mut descriptor_clone = descriptor.clone();
1146 self.do_attempt_write_data(&mut descriptor_clone, peer);
1148 peer.awaiting_pong = true;
1152 for mut descriptor in descriptors_needing_disconnect.drain(..) {
1153 descriptor.disconnect_socket();
1161 use bitcoin::secp256k1::Signature;
1162 use bitcoin::BitcoinHash;
1163 use bitcoin::network::constants::Network;
1164 use bitcoin::blockdata::constants::genesis_block;
1165 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
1167 use ln::features::ChannelFeatures;
1169 use util::test_utils;
1171 use bitcoin::secp256k1::Secp256k1;
1172 use bitcoin::secp256k1::key::{SecretKey, PublicKey};
1174 use rand::{thread_rng, Rng};
1178 use std::sync::{Arc, Mutex};
1179 use std::sync::atomic::{AtomicUsize, Ordering};
1182 struct FileDescriptor {
1184 outbound_data: Arc<Mutex<Vec<u8>>>,
1186 impl PartialEq for FileDescriptor {
1187 fn eq(&self, other: &Self) -> bool {
1191 impl Eq for FileDescriptor { }
1192 impl std::hash::Hash for FileDescriptor {
1193 fn hash<H: std::hash::Hasher>(&self, hasher: &mut H) {
1194 self.fd.hash(hasher)
1198 impl SocketDescriptor for FileDescriptor {
1199 fn send_data(&mut self, data: &[u8], _resume_read: bool) -> usize {
1200 self.outbound_data.lock().unwrap().extend_from_slice(data);
1204 fn disconnect_socket(&mut self) {}
1207 struct PeerManagerCfg {
1208 chan_handler: test_utils::TestChannelMessageHandler,
1209 logger: test_utils::TestLogger,
1212 fn create_peermgr_cfgs(peer_count: usize) -> Vec<PeerManagerCfg> {
1213 let mut cfgs = Vec::new();
1214 for _ in 0..peer_count {
1215 let chan_handler = test_utils::TestChannelMessageHandler::new();
1216 let logger = test_utils::TestLogger::new();
1228 fn create_network<'a>(peer_count: usize, cfgs: &'a Vec<PeerManagerCfg>, routing_handlers: Option<&'a Vec<Arc<msgs::RoutingMessageHandler>>>) -> Vec<PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestLogger>> {
1229 let mut peers = Vec::new();
1230 let mut rng = thread_rng();
1231 let mut ephemeral_bytes = [0; 32];
1232 rng.fill_bytes(&mut ephemeral_bytes);
1234 for i in 0..peer_count {
1235 let router = if let Some(routers) = routing_handlers { routers[i].clone() } else {
1236 Arc::new(test_utils::TestRoutingMessageHandler::new())
1239 let mut key_slice = [0;32];
1240 rng.fill_bytes(&mut key_slice);
1241 SecretKey::from_slice(&key_slice).unwrap()
1243 let msg_handler = MessageHandler { chan_handler: &cfgs[i].chan_handler, route_handler: router };
1244 let peer = PeerManager::new(msg_handler, node_id, &ephemeral_bytes, &cfgs[i].logger);
1251 fn establish_connection<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1252 let secp_ctx = Secp256k1::new();
1253 let a_id = PublicKey::from_secret_key(&secp_ctx, &peer_a.our_node_secret);
1254 let mut fd_a = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1255 let mut fd_b = FileDescriptor { fd: 1, outbound_data: Arc::new(Mutex::new(Vec::new())) };
1256 let initial_data = peer_b.new_outbound_connection(a_id, fd_b.clone()).unwrap();
1257 peer_a.new_inbound_connection(fd_a.clone()).unwrap();
1258 assert_eq!(peer_a.read_event(&mut fd_a, &initial_data).unwrap(), false);
1259 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1260 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1261 (fd_a.clone(), fd_b.clone())
1264 fn establish_connection_and_read_events<'a>(peer_a: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestLogger>, peer_b: &PeerManager<FileDescriptor, &'a test_utils::TestChannelMessageHandler, &'a test_utils::TestLogger>) -> (FileDescriptor, FileDescriptor) {
1265 let (mut fd_a, mut fd_b) = establish_connection(peer_a, peer_b);
1266 assert_eq!(peer_b.read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1267 assert_eq!(peer_a.read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap(), false);
1268 (fd_a.clone(), fd_b.clone())
1272 fn test_disconnect_peer() {
1273 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1274 // push a DisconnectPeer event to remove the node flagged by id
1275 let cfgs = create_peermgr_cfgs(2);
1276 let chan_handler = test_utils::TestChannelMessageHandler::new();
1277 let mut peers = create_network(2, &cfgs, None);
1278 establish_connection(&peers[0], &peers[1]);
1279 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1281 let secp_ctx = Secp256k1::new();
1282 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1284 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1286 action: msgs::ErrorAction::DisconnectPeer { msg: None },
1288 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1289 peers[0].message_handler.chan_handler = &chan_handler;
1291 peers[0].process_events();
1292 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1296 fn test_timer_tick_occurred() {
1297 // Create peers, a vector of two peer managers, perform initial set up and check that peers[0] has one Peer.
1298 let cfgs = create_peermgr_cfgs(2);
1299 let peers = create_network(2, &cfgs, None);
1300 establish_connection(&peers[0], &peers[1]);
1301 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1303 // peers[0] awaiting_pong is set to true, but the Peer is still connected
1304 peers[0].timer_tick_occured();
1305 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1307 // Since timer_tick_occured() is called again when awaiting_pong is true, all Peers are disconnected
1308 peers[0].timer_tick_occured();
1309 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);
1312 pub struct TestRoutingMessageHandler {
1313 pub chan_upds_recvd: AtomicUsize,
1314 pub chan_anns_recvd: AtomicUsize,
1315 pub chan_anns_sent: AtomicUsize,
1318 impl TestRoutingMessageHandler {
1319 pub fn new() -> Self {
1320 TestRoutingMessageHandler {
1321 chan_upds_recvd: AtomicUsize::new(0),
1322 chan_anns_recvd: AtomicUsize::new(0),
1323 chan_anns_sent: AtomicUsize::new(0),
1328 impl msgs::RoutingMessageHandler for TestRoutingMessageHandler {
1329 fn handle_node_announcement(&self, _msg: &msgs::NodeAnnouncement) -> Result<bool, msgs::LightningError> {
1330 Err(msgs::LightningError { err: "", action: msgs::ErrorAction::IgnoreError })
1332 fn handle_channel_announcement(&self, _msg: &msgs::ChannelAnnouncement) -> Result<bool, msgs::LightningError> {
1333 self.chan_anns_recvd.fetch_add(1, Ordering::AcqRel);
1334 Err(msgs::LightningError { err: "", action: msgs::ErrorAction::IgnoreError })
1336 fn handle_channel_update(&self, _msg: &msgs::ChannelUpdate) -> Result<bool, msgs::LightningError> {
1337 self.chan_upds_recvd.fetch_add(1, Ordering::AcqRel);
1338 Err(msgs::LightningError { err: "", action: msgs::ErrorAction::IgnoreError })
1340 fn handle_htlc_fail_channel_update(&self, _update: &msgs::HTLCFailChannelUpdate) {}
1341 fn get_next_channel_announcements(&self, starting_point: u64, batch_amount: u8) -> Vec<(msgs::ChannelAnnouncement, Option<msgs::ChannelUpdate>, Option<msgs::ChannelUpdate>)> {
1342 let mut chan_anns = Vec::new();
1343 const TOTAL_UPDS: u64 = 100;
1344 let end: u64 = min(starting_point + batch_amount as u64, TOTAL_UPDS - self.chan_anns_sent.load(Ordering::Acquire) as u64);
1345 for i in starting_point..end {
1346 let chan_upd_1 = get_dummy_channel_update(i);
1347 let chan_upd_2 = get_dummy_channel_update(i);
1348 let chan_ann = get_dummy_channel_announcement(i);
1350 chan_anns.push((chan_ann, Some(chan_upd_1), Some(chan_upd_2)));
1353 self.chan_anns_sent.fetch_add(chan_anns.len(), Ordering::AcqRel);
1357 fn get_next_node_announcements(&self, _starting_point: Option<&PublicKey>, _batch_amount: u8) -> Vec<msgs::NodeAnnouncement> {
1361 fn should_request_full_sync(&self, _node_id: &PublicKey) -> bool {
1366 fn get_dummy_channel_announcement(short_chan_id: u64) -> msgs::ChannelAnnouncement {
1367 use bitcoin::secp256k1::ffi::Signature as FFISignature;
1368 let secp_ctx = Secp256k1::new();
1369 let network = Network::Testnet;
1370 let node_1_privkey = SecretKey::from_slice(&[42; 32]).unwrap();
1371 let node_2_privkey = SecretKey::from_slice(&[41; 32]).unwrap();
1372 let node_1_btckey = SecretKey::from_slice(&[40; 32]).unwrap();
1373 let node_2_btckey = SecretKey::from_slice(&[39; 32]).unwrap();
1374 let unsigned_ann = msgs::UnsignedChannelAnnouncement {
1375 features: ChannelFeatures::known(),
1376 chain_hash: genesis_block(network).header.bitcoin_hash(),
1377 short_channel_id: short_chan_id,
1378 node_id_1: PublicKey::from_secret_key(&secp_ctx, &node_1_privkey),
1379 node_id_2: PublicKey::from_secret_key(&secp_ctx, &node_2_privkey),
1380 bitcoin_key_1: PublicKey::from_secret_key(&secp_ctx, &node_1_btckey),
1381 bitcoin_key_2: PublicKey::from_secret_key(&secp_ctx, &node_2_btckey),
1382 excess_data: Vec::new(),
1385 msgs::ChannelAnnouncement {
1386 node_signature_1: Signature::from(FFISignature::new()),
1387 node_signature_2: Signature::from(FFISignature::new()),
1388 bitcoin_signature_1: Signature::from(FFISignature::new()),
1389 bitcoin_signature_2: Signature::from(FFISignature::new()),
1390 contents: unsigned_ann,
1394 fn get_dummy_channel_update(short_chan_id: u64) -> msgs::ChannelUpdate {
1395 use bitcoin::secp256k1::ffi::Signature as FFISignature;
1396 let network = Network::Testnet;
1397 msgs::ChannelUpdate {
1398 signature: Signature::from(FFISignature::new()),
1399 contents: msgs::UnsignedChannelUpdate {
1400 chain_hash: genesis_block(network).header.bitcoin_hash(),
1401 short_channel_id: short_chan_id,
1404 cltv_expiry_delta: 0,
1405 htlc_minimum_msat: 0,
1407 fee_proportional_millionths: 0,
1408 excess_data: vec![],
1414 fn test_do_attempt_write_data() {
1415 // Create 2 peers with custom TestRoutingMessageHandlers and connect them.
1416 let cfgs = create_peermgr_cfgs(2);
1417 let mut routing_handlers: Vec<Arc<msgs::RoutingMessageHandler>> = Vec::new();
1418 let mut routing_handlers_concrete: Vec<Arc<TestRoutingMessageHandler>> = Vec::new();
1420 let routing_handler = Arc::new(TestRoutingMessageHandler::new());
1421 routing_handlers.push(routing_handler.clone());
1422 routing_handlers_concrete.push(routing_handler.clone());
1424 let peers = create_network(2, &cfgs, Some(&routing_handlers));
1426 // By calling establish_connect, we trigger do_attempt_write_data between
1427 // the peers. Previously this function would mistakenly enter an infinite loop
1428 // when there were more channel messages available than could fit into a peer's
1429 // buffer. This issue would now be detected by this test (because we use custom
1430 // RoutingMessageHandlers that intentionally return more channel messages
1431 // than can fit into a peer's buffer).
1432 let (mut fd_a, mut fd_b) = establish_connection(&peers[0], &peers[1]);
1434 // Make each peer to read the messages that the other peer just wrote to them.
1435 peers[1].read_event(&mut fd_b, &fd_a.outbound_data.lock().unwrap().split_off(0)).unwrap();
1436 peers[0].read_event(&mut fd_a, &fd_b.outbound_data.lock().unwrap().split_off(0)).unwrap();
1438 // Check that each peer has received the expected number of channel updates and channel
1440 assert_eq!(routing_handlers_concrete[0].clone().chan_upds_recvd.load(Ordering::Acquire), 100);
1441 assert_eq!(routing_handlers_concrete[0].clone().chan_anns_recvd.load(Ordering::Acquire), 50);
1442 assert_eq!(routing_handlers_concrete[1].clone().chan_upds_recvd.load(Ordering::Acquire), 100);
1443 assert_eq!(routing_handlers_concrete[1].clone().chan_anns_recvd.load(Ordering::Acquire), 50);
1447 fn limit_initial_routing_sync_requests() {
1448 // Inbound peer 0 requests initial_routing_sync, but outbound peer 1 does not.
1450 let cfgs = create_peermgr_cfgs(2);
1451 let routing_handlers: Vec<Arc<msgs::RoutingMessageHandler>> = vec![
1452 Arc::new(test_utils::TestRoutingMessageHandler::new().set_request_full_sync()),
1453 Arc::new(test_utils::TestRoutingMessageHandler::new()),
1455 let peers = create_network(2, &cfgs, Some(&routing_handlers));
1456 let (fd_0_to_1, fd_1_to_0) = establish_connection_and_read_events(&peers[0], &peers[1]);
1458 let peer_0 = peers[0].peers.lock().unwrap();
1459 let peer_1 = peers[1].peers.lock().unwrap();
1461 let peer_0_features = peer_1.peers.get(&fd_1_to_0).unwrap().their_features.as_ref();
1462 let peer_1_features = peer_0.peers.get(&fd_0_to_1).unwrap().their_features.as_ref();
1464 assert!(peer_0_features.unwrap().initial_routing_sync());
1465 assert!(!peer_1_features.unwrap().initial_routing_sync());
1468 // Outbound peer 1 requests initial_routing_sync, but inbound peer 0 does not.
1470 let cfgs = create_peermgr_cfgs(2);
1471 let routing_handlers: Vec<Arc<msgs::RoutingMessageHandler>> = vec![
1472 Arc::new(test_utils::TestRoutingMessageHandler::new()),
1473 Arc::new(test_utils::TestRoutingMessageHandler::new().set_request_full_sync()),
1475 let peers = create_network(2, &cfgs, Some(&routing_handlers));
1476 let (fd_0_to_1, fd_1_to_0) = establish_connection_and_read_events(&peers[0], &peers[1]);
1478 let peer_0 = peers[0].peers.lock().unwrap();
1479 let peer_1 = peers[1].peers.lock().unwrap();
1481 let peer_0_features = peer_1.peers.get(&fd_1_to_0).unwrap().their_features.as_ref();
1482 let peer_1_features = peer_0.peers.get(&fd_0_to_1).unwrap().their_features.as_ref();
1484 assert!(!peer_0_features.unwrap().initial_routing_sync());
1485 assert!(peer_1_features.unwrap().initial_routing_sync());