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 Router) with messages
7 //! they should handle, and encoding/sending response messages.
9 use secp256k1::key::{SecretKey,PublicKey};
12 use util::ser::{Writeable, Writer, Readable};
13 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
15 use util::events::{MessageSendEvent};
16 use util::logger::Logger;
18 use std::collections::{HashMap,hash_map,HashSet,LinkedList};
19 use std::sync::{Arc, Mutex};
20 use std::sync::atomic::{AtomicUsize, Ordering};
21 use std::{cmp,error,hash,fmt};
23 /// Provides references to trait impls which handle different types of messages.
24 pub struct MessageHandler {
25 /// A message handler which handles messages specific to channels. Usually this is just a
26 /// ChannelManager object.
27 pub chan_handler: Arc<msgs::ChannelMessageHandler>,
28 /// A message handler which handles messages updating our knowledge of the network channel
29 /// graph. Usually this is just a Router object.
30 pub route_handler: Arc<msgs::RoutingMessageHandler>,
33 /// Provides an object which can be used to send data to and which uniquely identifies a connection
34 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
35 /// implement Hash to meet the PeerManager API.
37 /// For efficiency, Clone should be relatively cheap for this type.
39 /// You probably want to just extend an int and put a file descriptor in a struct and implement
40 /// send_data. Note that if you are using a higher-level net library that may close() itself, be
41 /// careful to ensure you don't have races whereby you might register a new connection with an fd
42 /// the same as a yet-to-be-disconnect_event()-ed.
43 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
44 /// Attempts to send some data from the given Vec starting at the given offset to the peer.
45 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
46 /// Note that in the disconnected case, a disconnect_event must still fire and further write
47 /// attempts may occur until that time.
49 /// If the returned size is smaller than data.len() - write_offset, a write_available event must
50 /// trigger the next time more data can be written. Additionally, until the a send_data event
51 /// completes fully, no further read_events should trigger on the same peer!
53 /// If a read_event on this descriptor had previously returned true (indicating that read
54 /// events should be paused to prevent DoS in the send buffer), resume_read may be set
55 /// indicating that read events on this descriptor should resume. A resume_read of false does
56 /// *not* imply that further read events should be paused.
57 fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, resume_read: bool) -> usize;
58 /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
59 /// more calls to write_event, read_event or disconnect_event may be made with this descriptor.
60 /// No disconnect_event should be generated as a result of this call, though obviously races
61 /// may occur whereby disconnect_socket is called after a call to disconnect_event but prior to
62 /// that event completing.
63 fn disconnect_socket(&mut self);
66 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
67 /// generate no further read/write_events for the descriptor, only triggering a single
68 /// disconnect_event (unless it was provided in response to a new_*_connection event, in which case
69 /// no such disconnect_event must be generated and the socket be silently disconencted).
70 pub struct PeerHandleError {
71 /// Used to indicate that we probably can't make any future connections to this peer, implying
72 /// we should go ahead and force-close any channels we have with it.
73 no_connection_possible: bool,
75 impl fmt::Debug for PeerHandleError {
76 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
77 formatter.write_str("Peer Sent Invalid Data")
80 impl fmt::Display for PeerHandleError {
81 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
82 formatter.write_str("Peer Sent Invalid Data")
85 impl error::Error for PeerHandleError {
86 fn description(&self) -> &str {
87 "Peer Sent Invalid Data"
92 channel_encryptor: PeerChannelEncryptor,
94 their_node_id: Option<PublicKey>,
95 their_global_features: Option<msgs::GlobalFeatures>,
96 their_local_features: Option<msgs::LocalFeatures>,
98 pending_outbound_buffer: LinkedList<Vec<u8>>,
99 pending_outbound_buffer_first_msg_offset: usize,
100 awaiting_write_event: bool,
102 pending_read_buffer: Vec<u8>,
103 pending_read_buffer_pos: usize,
104 pending_read_is_header: bool,
107 struct PeerHolder<Descriptor: SocketDescriptor> {
108 peers: HashMap<Descriptor, Peer>,
109 /// Added to by do_read_event for cases where we pushed a message onto the send buffer but
110 /// didn't call do_attempt_write_data to avoid reentrancy. Cleared in process_events()
111 peers_needing_send: HashSet<Descriptor>,
112 /// Only add to this set when noise completes:
113 node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
115 struct MutPeerHolder<'a, Descriptor: SocketDescriptor + 'a> {
116 peers: &'a mut HashMap<Descriptor, Peer>,
117 peers_needing_send: &'a mut HashSet<Descriptor>,
118 node_id_to_descriptor: &'a mut HashMap<PublicKey, Descriptor>,
120 impl<Descriptor: SocketDescriptor> PeerHolder<Descriptor> {
121 fn borrow_parts(&mut self) -> MutPeerHolder<Descriptor> {
123 peers: &mut self.peers,
124 peers_needing_send: &mut self.peers_needing_send,
125 node_id_to_descriptor: &mut self.node_id_to_descriptor,
130 /// A PeerManager manages a set of peers, described by their SocketDescriptor and marshalls socket
131 /// events into messages which it passes on to its MessageHandlers.
132 pub struct PeerManager<Descriptor: SocketDescriptor> {
133 message_handler: MessageHandler,
134 peers: Mutex<PeerHolder<Descriptor>>,
135 our_node_secret: SecretKey,
136 initial_syncs_sent: AtomicUsize,
140 struct VecWriter(Vec<u8>);
141 impl Writer for VecWriter {
142 fn write_all(&mut self, buf: &[u8]) -> Result<(), ::std::io::Error> {
143 self.0.extend_from_slice(buf);
146 fn size_hint(&mut self, size: usize) {
147 self.0.reserve_exact(size);
151 macro_rules! encode_msg {
152 ($msg: expr, $msg_code: expr) => {{
153 let mut msg = VecWriter(Vec::new());
154 ($msg_code as u16).write(&mut msg).unwrap();
155 $msg.write(&mut msg).unwrap();
160 //TODO: Really should do something smarter for this
161 const INITIAL_SYNCS_TO_SEND: usize = 5;
163 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
164 /// PeerIds may repeat, but only after disconnect_event() has been called.
165 impl<Descriptor: SocketDescriptor> PeerManager<Descriptor> {
166 /// Constructs a new PeerManager with the given message handlers and node_id secret key
167 pub fn new(message_handler: MessageHandler, our_node_secret: SecretKey, logger: Arc<Logger>) -> PeerManager<Descriptor> {
169 message_handler: message_handler,
170 peers: Mutex::new(PeerHolder {
171 peers: HashMap::new(),
172 peers_needing_send: HashSet::new(),
173 node_id_to_descriptor: HashMap::new()
175 our_node_secret: our_node_secret,
176 initial_syncs_sent: AtomicUsize::new(0),
181 /// Get the list of node ids for peers which have completed the initial handshake.
183 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
184 /// new_outbound_connection, however entries will only appear once the initial handshake has
185 /// completed and we are sure the remote peer has the private key for the given node_id.
186 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
187 let peers = self.peers.lock().unwrap();
188 peers.peers.values().filter_map(|p| {
189 if !p.channel_encryptor.is_ready_for_encryption() || p.their_global_features.is_none() {
196 /// Indicates a new outbound connection has been established to a node with the given node_id.
197 /// Note that if an Err is returned here you MUST NOT call disconnect_event for the new
198 /// descriptor but must disconnect the connection immediately.
200 /// Returns a small number of bytes to send to the remote node (currently always 50).
202 /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
203 /// disconnect_event.
204 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
205 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone());
206 let res = peer_encryptor.get_act_one().to_vec();
207 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
209 let mut peers = self.peers.lock().unwrap();
210 if peers.peers.insert(descriptor, Peer {
211 channel_encryptor: peer_encryptor,
213 their_node_id: Some(their_node_id),
214 their_global_features: None,
215 their_local_features: None,
217 pending_outbound_buffer: LinkedList::new(),
218 pending_outbound_buffer_first_msg_offset: 0,
219 awaiting_write_event: false,
221 pending_read_buffer: pending_read_buffer,
222 pending_read_buffer_pos: 0,
223 pending_read_is_header: false,
225 panic!("PeerManager driver duplicated descriptors!");
230 /// Indicates a new inbound connection has been established.
232 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
233 /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
234 /// call disconnect_event for the new descriptor but must disconnect the connection
237 /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
238 /// disconnect_event.
239 pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
240 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
241 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
243 let mut peers = self.peers.lock().unwrap();
244 if peers.peers.insert(descriptor, Peer {
245 channel_encryptor: peer_encryptor,
248 their_global_features: None,
249 their_local_features: None,
251 pending_outbound_buffer: LinkedList::new(),
252 pending_outbound_buffer_first_msg_offset: 0,
253 awaiting_write_event: false,
255 pending_read_buffer: pending_read_buffer,
256 pending_read_buffer_pos: 0,
257 pending_read_is_header: false,
259 panic!("PeerManager driver duplicated descriptors!");
264 fn do_attempt_write_data(descriptor: &mut Descriptor, peer: &mut Peer) {
265 while !peer.awaiting_write_event {
267 let next_buff = match peer.pending_outbound_buffer.front() {
271 let should_be_reading = peer.pending_outbound_buffer.len() < 10;
273 let data_sent = descriptor.send_data(next_buff, peer.pending_outbound_buffer_first_msg_offset, should_be_reading);
274 peer.pending_outbound_buffer_first_msg_offset += data_sent;
275 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
277 peer.pending_outbound_buffer_first_msg_offset = 0;
278 peer.pending_outbound_buffer.pop_front();
280 peer.awaiting_write_event = true;
285 /// Indicates that there is room to write data to the given socket descriptor.
287 /// May return an Err to indicate that the connection should be closed.
289 /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
290 /// new_*\_connection) before returning. Thus, be very careful with reentrancy issues! The
291 /// invariants around calling write_event in case a write did not fully complete must still
292 /// hold - be ready to call write_event again if a write call generated here isn't sufficient!
293 /// Panics if the descriptor was not previously registered in a new_\*_connection event.
294 pub fn write_event(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
295 let mut peers = self.peers.lock().unwrap();
296 match peers.peers.get_mut(descriptor) {
297 None => panic!("Descriptor for write_event is not already known to PeerManager"),
299 peer.awaiting_write_event = false;
300 Self::do_attempt_write_data(descriptor, peer);
306 /// Indicates that data was read from the given socket descriptor.
308 /// May return an Err to indicate that the connection should be closed.
310 /// Will *not* call back into send_data on any descriptors to avoid reentrancy complexity.
311 /// Thus, however, you almost certainly want to call process_events() after any read_event to
312 /// generate send_data calls to handle responses.
314 /// If Ok(true) is returned, further read_events should not be triggered until a write_event on
315 /// this file descriptor has resume_read set (preventing DoS issues in the send buffer).
317 /// Panics if the descriptor was not previously registered in a new_*_connection event.
318 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
319 match self.do_read_event(peer_descriptor, data) {
322 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
328 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
330 let mut peers_lock = self.peers.lock().unwrap();
331 let peers = peers_lock.borrow_parts();
332 let pause_read = match peers.peers.get_mut(peer_descriptor) {
333 None => panic!("Descriptor for read_event is not already known to PeerManager"),
335 assert!(peer.pending_read_buffer.len() > 0);
336 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
338 let mut read_pos = 0;
339 while read_pos < data.len() {
341 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
342 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]);
343 read_pos += data_to_copy;
344 peer.pending_read_buffer_pos += data_to_copy;
347 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
348 peer.pending_read_buffer_pos = 0;
350 macro_rules! encode_and_send_msg {
351 ($msg: expr, $msg_code: expr) => {
353 log_trace!(self, "Encoding and sending message of type {} to {}", $msg_code, log_pubkey!(peer.their_node_id.unwrap()));
354 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
355 peers.peers_needing_send.insert(peer_descriptor.clone());
360 macro_rules! try_potential_handleerror {
365 if let Some(action) = e.action {
367 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
368 //TODO: Try to push msg
369 log_trace!(self, "Got Err handling message, disconnecting peer because {}", e.err);
370 return Err(PeerHandleError{ no_connection_possible: false });
372 msgs::ErrorAction::IgnoreError => {
373 log_trace!(self, "Got Err handling message, ignoring because {}", e.err);
376 msgs::ErrorAction::SendErrorMessage { msg } => {
377 log_trace!(self, "Got Err handling message, sending Error message because {}", e.err);
378 encode_and_send_msg!(msg, 17);
383 log_debug!(self, "Got Err handling message, action not yet filled in: {}", e.err);
384 return Err(PeerHandleError{ no_connection_possible: false });
391 macro_rules! try_potential_decodeerror {
397 msgs::DecodeError::UnknownVersion => return Err(PeerHandleError{ no_connection_possible: false }),
398 msgs::DecodeError::UnknownRequiredFeature => {
399 log_debug!(self, "Got a channel/node announcement with an known required feature flag, you may want to udpate!");
402 msgs::DecodeError::InvalidValue => return Err(PeerHandleError{ no_connection_possible: false }),
403 msgs::DecodeError::ShortRead => return Err(PeerHandleError{ no_connection_possible: false }),
404 msgs::DecodeError::ExtraAddressesPerType => {
405 log_debug!(self, "Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
408 msgs::DecodeError::BadLengthDescriptor => return Err(PeerHandleError{ no_connection_possible: false }),
409 msgs::DecodeError::Io(_) => return Err(PeerHandleError{ no_connection_possible: false }),
416 macro_rules! insert_node_id {
418 match peers.node_id_to_descriptor.entry(peer.their_node_id.unwrap()) {
419 hash_map::Entry::Occupied(_) => {
420 peer.their_node_id = None; // Unset so that we don't generate a peer_disconnected event
421 return Err(PeerHandleError{ no_connection_possible: false })
423 hash_map::Entry::Vacant(entry) => entry.insert(peer_descriptor.clone()),
428 let next_step = peer.channel_encryptor.get_noise_step();
430 NextNoiseStep::ActOne => {
431 let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_key(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
432 peer.pending_outbound_buffer.push_back(act_two);
433 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
435 NextNoiseStep::ActTwo => {
436 let act_three = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
437 peer.pending_outbound_buffer.push_back(act_three);
438 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
439 peer.pending_read_is_header = true;
442 let mut local_features = msgs::LocalFeatures::new();
443 if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
444 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
445 local_features.set_initial_routing_sync();
447 encode_and_send_msg!(msgs::Init {
448 global_features: msgs::GlobalFeatures::new(),
452 NextNoiseStep::ActThree => {
453 let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
454 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
455 peer.pending_read_is_header = true;
456 peer.their_node_id = Some(their_node_id);
459 NextNoiseStep::NoiseComplete => {
460 if peer.pending_read_is_header {
461 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
462 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
463 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
464 if msg_len < 2 { // Need at least the message type tag
465 return Err(PeerHandleError{ no_connection_possible: false });
467 peer.pending_read_is_header = false;
469 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
470 assert!(msg_data.len() >= 2);
473 peer.pending_read_buffer = [0; 18].to_vec();
474 peer.pending_read_is_header = true;
476 let msg_type = byte_utils::slice_to_be16(&msg_data[0..2]);
477 log_trace!(self, "Received message of type {} from {}", msg_type, log_pubkey!(peer.their_node_id.unwrap()));
478 if msg_type != 16 && peer.their_global_features.is_none() {
479 // Need an init message as first message
480 return Err(PeerHandleError{ no_connection_possible: false });
482 let mut reader = ::std::io::Cursor::new(&msg_data[2..]);
484 // Connection control:
486 let msg = try_potential_decodeerror!(msgs::Init::read(&mut reader));
487 if msg.global_features.requires_unknown_bits() {
488 log_info!(self, "Peer global features required unknown version bits");
489 return Err(PeerHandleError{ no_connection_possible: true });
491 if msg.local_features.requires_unknown_bits() {
492 log_info!(self, "Peer local features required unknown version bits");
493 return Err(PeerHandleError{ no_connection_possible: true });
495 if msg.local_features.requires_data_loss_protect() {
496 log_info!(self, "Peer local features required data_loss_protect");
497 return Err(PeerHandleError{ no_connection_possible: true });
499 if msg.local_features.requires_upfront_shutdown_script() {
500 log_info!(self, "Peer local features required upfront_shutdown_script");
501 return Err(PeerHandleError{ no_connection_possible: true });
503 if peer.their_global_features.is_some() {
504 return Err(PeerHandleError{ no_connection_possible: false });
507 log_info!(self, "Received peer Init message: data_loss_protect: {}, initial_routing_sync: {}, upfront_shutdown_script: {}, unkown local flags: {}, unknown global flags: {}",
508 if msg.local_features.supports_data_loss_protect() { "supported" } else { "not supported"},
509 if msg.local_features.initial_routing_sync() { "requested" } else { "not requested" },
510 if msg.local_features.supports_upfront_shutdown_script() { "supported" } else { "not supported"},
511 if msg.local_features.supports_unknown_bits() { "present" } else { "none" },
512 if msg.global_features.supports_unknown_bits() { "present" } else { "none" });
514 peer.their_global_features = Some(msg.global_features);
515 peer.their_local_features = Some(msg.local_features);
518 let mut local_features = msgs::LocalFeatures::new();
519 if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
520 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
521 local_features.set_initial_routing_sync();
523 encode_and_send_msg!(msgs::Init {
524 global_features: msgs::GlobalFeatures::new(),
529 self.message_handler.chan_handler.peer_connected(&peer.their_node_id.unwrap());
532 let msg = try_potential_decodeerror!(msgs::ErrorMessage::read(&mut reader));
533 let mut data_is_printable = true;
534 for b in msg.data.bytes() {
535 if b < 32 || b > 126 {
536 data_is_printable = false;
541 if data_is_printable {
542 log_debug!(self, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
544 log_debug!(self, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
546 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
547 if msg.channel_id == [0; 32] {
548 return Err(PeerHandleError{ no_connection_possible: true });
553 let msg = try_potential_decodeerror!(msgs::Ping::read(&mut reader));
554 if msg.ponglen < 65532 {
555 let resp = msgs::Pong { byteslen: msg.ponglen };
556 encode_and_send_msg!(resp, 19);
560 try_potential_decodeerror!(msgs::Pong::read(&mut reader));
565 let msg = try_potential_decodeerror!(msgs::OpenChannel::read(&mut reader));
566 try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg));
569 let msg = try_potential_decodeerror!(msgs::AcceptChannel::read(&mut reader));
570 try_potential_handleerror!(self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), &msg));
574 let msg = try_potential_decodeerror!(msgs::FundingCreated::read(&mut reader));
575 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg));
578 let msg = try_potential_decodeerror!(msgs::FundingSigned::read(&mut reader));
579 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg));
582 let msg = try_potential_decodeerror!(msgs::FundingLocked::read(&mut reader));
583 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg));
587 let msg = try_potential_decodeerror!(msgs::Shutdown::read(&mut reader));
588 try_potential_handleerror!(self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg));
591 let msg = try_potential_decodeerror!(msgs::ClosingSigned::read(&mut reader));
592 try_potential_handleerror!(self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg));
596 let msg = try_potential_decodeerror!(msgs::UpdateAddHTLC::read(&mut reader));
597 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg));
600 let msg = try_potential_decodeerror!(msgs::UpdateFulfillHTLC::read(&mut reader));
601 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg));
604 let msg = try_potential_decodeerror!(msgs::UpdateFailHTLC::read(&mut reader));
605 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg));
608 let msg = try_potential_decodeerror!(msgs::UpdateFailMalformedHTLC::read(&mut reader));
609 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg));
613 let msg = try_potential_decodeerror!(msgs::CommitmentSigned::read(&mut reader));
614 try_potential_handleerror!(self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg));
617 let msg = try_potential_decodeerror!(msgs::RevokeAndACK::read(&mut reader));
618 try_potential_handleerror!(self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg));
621 let msg = try_potential_decodeerror!(msgs::UpdateFee::read(&mut reader));
622 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg));
625 let msg = try_potential_decodeerror!(msgs::ChannelReestablish::read(&mut reader));
626 try_potential_handleerror!(self.message_handler.chan_handler.handle_channel_reestablish(&peer.their_node_id.unwrap(), &msg));
631 let msg = try_potential_decodeerror!(msgs::AnnouncementSignatures::read(&mut reader));
632 try_potential_handleerror!(self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg));
635 let msg = try_potential_decodeerror!(msgs::ChannelAnnouncement::read(&mut reader));
636 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
639 // TODO: forward msg along to all our other peers!
643 let msg = try_potential_decodeerror!(msgs::NodeAnnouncement::read(&mut reader));
644 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
647 // TODO: forward msg along to all our other peers!
651 let msg = try_potential_decodeerror!(msgs::ChannelUpdate::read(&mut reader));
652 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
655 // TODO: forward msg along to all our other peers!
659 if (msg_type & 1) == 0 {
660 return Err(PeerHandleError{ no_connection_possible: true });
670 Self::do_attempt_write_data(peer_descriptor, peer);
672 peer.pending_outbound_buffer.len() > 10 // pause_read
682 /// Checks for any events generated by our handlers and processes them. Includes sending most
683 /// response messages as well as messages generated by calls to handler functions directly (eg
684 /// functions like ChannelManager::process_pending_htlc_forward or send_payment).
685 pub fn process_events(&self) {
687 // TODO: There are some DoS attacks here where you can flood someone's outbound send
688 // buffer by doing things like announcing channels on another node. We should be willing to
689 // drop optional-ish messages when send buffers get full!
691 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_msg_events();
692 let mut peers_lock = self.peers.lock().unwrap();
693 let peers = peers_lock.borrow_parts();
694 for event in events_generated.drain(..) {
695 macro_rules! get_peer_for_forwarding {
696 ($node_id: expr, $handle_no_such_peer: block) => {
698 let descriptor = match peers.node_id_to_descriptor.get($node_id) {
699 Some(descriptor) => descriptor.clone(),
701 $handle_no_such_peer;
705 match peers.peers.get_mut(&descriptor) {
707 if peer.their_global_features.is_none() {
708 $handle_no_such_peer;
713 None => panic!("Inconsistent peers set state!"),
719 MessageSendEvent::SendAcceptChannel { ref node_id, ref msg } => {
720 log_trace!(self, "Handling SendAcceptChannel event in peer_handler for node {} for channel {}",
721 log_pubkey!(node_id),
722 log_bytes!(msg.temporary_channel_id));
723 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
724 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
726 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 33)));
727 Self::do_attempt_write_data(&mut descriptor, peer);
729 MessageSendEvent::SendOpenChannel { ref node_id, ref msg } => {
730 log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
731 log_pubkey!(node_id),
732 log_bytes!(msg.temporary_channel_id));
733 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
734 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
736 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 32)));
737 Self::do_attempt_write_data(&mut descriptor, peer);
739 MessageSendEvent::SendFundingCreated { ref node_id, ref msg } => {
740 log_trace!(self, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
741 log_pubkey!(node_id),
742 log_bytes!(msg.temporary_channel_id),
743 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
744 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
745 //TODO: generate a DiscardFunding event indicating to the wallet that
746 //they should just throw away this funding transaction
748 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 34)));
749 Self::do_attempt_write_data(&mut descriptor, peer);
751 MessageSendEvent::SendFundingSigned { ref node_id, ref msg } => {
752 log_trace!(self, "Handling SendFundingSigned event in peer_handler for node {} for channel {}",
753 log_pubkey!(node_id),
754 log_bytes!(msg.channel_id));
755 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
756 //TODO: generate a DiscardFunding event indicating to the wallet that
757 //they should just throw away this funding transaction
759 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 35)));
760 Self::do_attempt_write_data(&mut descriptor, peer);
762 MessageSendEvent::SendFundingLocked { ref node_id, ref msg } => {
763 log_trace!(self, "Handling SendFundingLocked event in peer_handler for node {} for channel {}",
764 log_pubkey!(node_id),
765 log_bytes!(msg.channel_id));
766 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
767 //TODO: Do whatever we're gonna do for handling dropped messages
769 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 36)));
770 Self::do_attempt_write_data(&mut descriptor, peer);
772 MessageSendEvent::SendAnnouncementSignatures { ref node_id, ref msg } => {
773 log_trace!(self, "Handling SendAnnouncementSignatures event in peer_handler for node {} for channel {})",
774 log_pubkey!(node_id),
775 log_bytes!(msg.channel_id));
776 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
777 //TODO: generate a DiscardFunding event indicating to the wallet that
778 //they should just throw away this funding transaction
780 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 259)));
781 Self::do_attempt_write_data(&mut descriptor, peer);
783 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 } } => {
784 log_trace!(self, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
785 log_pubkey!(node_id),
786 update_add_htlcs.len(),
787 update_fulfill_htlcs.len(),
788 update_fail_htlcs.len(),
789 log_bytes!(commitment_signed.channel_id));
790 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
791 //TODO: Do whatever we're gonna do for handling dropped messages
793 for msg in update_add_htlcs {
794 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 128)));
796 for msg in update_fulfill_htlcs {
797 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 130)));
799 for msg in update_fail_htlcs {
800 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 131)));
802 for msg in update_fail_malformed_htlcs {
803 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 135)));
805 if let &Some(ref msg) = update_fee {
806 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 134)));
808 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed, 132)));
809 Self::do_attempt_write_data(&mut descriptor, peer);
811 MessageSendEvent::SendRevokeAndACK { ref node_id, ref msg } => {
812 log_trace!(self, "Handling SendRevokeAndACK event in peer_handler for node {} for channel {}",
813 log_pubkey!(node_id),
814 log_bytes!(msg.channel_id));
815 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
816 //TODO: Do whatever we're gonna do for handling dropped messages
818 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 133)));
819 Self::do_attempt_write_data(&mut descriptor, peer);
821 MessageSendEvent::SendClosingSigned { ref node_id, ref msg } => {
822 log_trace!(self, "Handling SendClosingSigned event in peer_handler for node {} for channel {}",
823 log_pubkey!(node_id),
824 log_bytes!(msg.channel_id));
825 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
826 //TODO: Do whatever we're gonna do for handling dropped messages
828 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 39)));
829 Self::do_attempt_write_data(&mut descriptor, peer);
831 MessageSendEvent::SendShutdown { ref node_id, ref msg } => {
832 log_trace!(self, "Handling Shutdown event in peer_handler for node {} for channel {}",
833 log_pubkey!(node_id),
834 log_bytes!(msg.channel_id));
835 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
836 //TODO: Do whatever we're gonna do for handling dropped messages
838 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 38)));
839 Self::do_attempt_write_data(&mut descriptor, peer);
841 MessageSendEvent::SendChannelReestablish { ref node_id, ref msg } => {
842 log_trace!(self, "Handling SendChannelReestablish event in peer_handler for node {} for channel {}",
843 log_pubkey!(node_id),
844 log_bytes!(msg.channel_id));
845 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
846 //TODO: Do whatever we're gonna do for handling dropped messages
848 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 136)));
849 Self::do_attempt_write_data(&mut descriptor, peer);
851 MessageSendEvent::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
852 log_trace!(self, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
853 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
854 let encoded_msg = encode_msg!(msg, 256);
855 let encoded_update_msg = encode_msg!(update_msg, 258);
857 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
858 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
861 match peer.their_node_id {
863 Some(their_node_id) => {
864 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
869 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
870 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
871 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
875 MessageSendEvent::BroadcastChannelUpdate { ref msg } => {
876 log_trace!(self, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
877 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
878 let encoded_msg = encode_msg!(msg, 258);
880 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
881 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
884 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
885 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
889 MessageSendEvent::PaymentFailureNetworkUpdate { ref update } => {
890 self.message_handler.route_handler.handle_htlc_fail_channel_update(update);
892 MessageSendEvent::HandleError { ref node_id, ref action } => {
893 if let Some(ref action) = *action {
895 msgs::ErrorAction::DisconnectPeer { ref msg } => {
896 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
897 peers.peers_needing_send.remove(&descriptor);
898 if let Some(mut peer) = peers.peers.remove(&descriptor) {
899 if let Some(ref msg) = *msg {
900 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
901 log_pubkey!(node_id),
903 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
904 // This isn't guaranteed to work, but if there is enough free
905 // room in the send buffer, put the error message there...
906 Self::do_attempt_write_data(&mut descriptor, &mut peer);
908 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
911 descriptor.disconnect_socket();
912 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
915 msgs::ErrorAction::IgnoreError => {},
916 msgs::ErrorAction::SendErrorMessage { ref msg } => {
917 log_trace!(self, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
918 log_pubkey!(node_id),
920 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
921 //TODO: Do whatever we're gonna do for handling dropped messages
923 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
924 Self::do_attempt_write_data(&mut descriptor, peer);
928 log_error!(self, "Got no-action HandleError Event in peer_handler for node {}, no such events should ever be generated!", log_pubkey!(node_id));
934 for mut descriptor in peers.peers_needing_send.drain() {
935 match peers.peers.get_mut(&descriptor) {
936 Some(peer) => Self::do_attempt_write_data(&mut descriptor, peer),
937 None => panic!("Inconsistent peers set state!"),
943 /// Indicates that the given socket descriptor's connection is now closed.
945 /// This must be called even if a PeerHandleError was given for a read_event or write_event,
946 /// but must NOT be called if a PeerHandleError was provided out of a new_\*\_connection event!
948 /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
949 pub fn disconnect_event(&self, descriptor: &Descriptor) {
950 self.disconnect_event_internal(descriptor, false);
953 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
954 let mut peers = self.peers.lock().unwrap();
955 peers.peers_needing_send.remove(descriptor);
956 let peer_option = peers.peers.remove(descriptor);
958 None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
960 match peer.their_node_id {
962 peers.node_id_to_descriptor.remove(&node_id);
963 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
974 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
977 use util::test_utils;
978 use util::logger::Logger;
980 use secp256k1::Secp256k1;
981 use secp256k1::key::{SecretKey, PublicKey};
983 use rand::{thread_rng, Rng};
985 use std::sync::{Arc};
987 #[derive(PartialEq, Eq, Clone, Hash)]
988 struct FileDescriptor {
992 impl SocketDescriptor for FileDescriptor {
993 fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, _resume_read: bool) -> usize {
994 assert!(write_offset < data.len());
995 data.len() - write_offset
998 fn disconnect_socket(&mut self) {}
1001 fn create_network(peer_count: usize) -> Vec<PeerManager<FileDescriptor>> {
1002 let secp_ctx = Secp256k1::new();
1003 let mut peers = Vec::new();
1004 let mut rng = thread_rng();
1005 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
1007 for _ in 0..peer_count {
1008 let chan_handler = test_utils::TestChannelMessageHandler::new();
1009 let router = test_utils::TestRoutingMessageHandler::new();
1011 let mut key_slice = [0;32];
1012 rng.fill_bytes(&mut key_slice);
1013 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
1015 let msg_handler = MessageHandler { chan_handler: Arc::new(chan_handler), route_handler: Arc::new(router) };
1016 let peer = PeerManager::new(msg_handler, node_id, Arc::clone(&logger));
1023 fn establish_connection(peer_a: &PeerManager<FileDescriptor>, peer_b: &PeerManager<FileDescriptor>) {
1024 let secp_ctx = Secp256k1::new();
1025 let their_id = PublicKey::from_secret_key(&secp_ctx, &peer_b.our_node_secret);
1026 let fd = FileDescriptor { fd: 1};
1027 peer_a.new_inbound_connection(fd.clone()).unwrap();
1028 peer_a.peers.lock().unwrap().node_id_to_descriptor.insert(their_id, fd.clone());
1032 fn test_disconnect_peer() {
1033 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
1034 // push an DisconnectPeer event to remove the node flagged by id
1035 let mut peers = create_network(2);
1036 establish_connection(&peers[0], &peers[1]);
1037 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
1039 let secp_ctx = Secp256k1::new();
1040 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
1042 let chan_handler = test_utils::TestChannelMessageHandler::new();
1043 chan_handler.pending_events.lock().unwrap().push(events::MessageSendEvent::HandleError {
1045 action: Some(msgs::ErrorAction::DisconnectPeer { msg: None }),
1047 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
1048 peers[0].message_handler.chan_handler = Arc::new(chan_handler);
1050 peers[0].process_events();
1051 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);