1 use secp256k1::key::{SecretKey,PublicKey};
4 use ln::msgs::{MsgEncodable,MsgDecodable};
5 use ln::peer_channel_encryptor::{PeerChannelEncryptor,NextNoiseStep};
7 use util::events::{EventsProvider,Event};
8 use util::logger::Logger;
10 use std::collections::{HashMap,LinkedList};
11 use std::sync::{Arc, Mutex};
12 use std::sync::atomic::{AtomicUsize, Ordering};
13 use std::{cmp,error,mem,hash,fmt};
15 pub struct MessageHandler {
16 pub chan_handler: Arc<msgs::ChannelMessageHandler>,
17 pub route_handler: Arc<msgs::RoutingMessageHandler>,
20 /// Provides an object which can be used to send data to and which uniquely identifies a connection
21 /// to a remote host. You will need to be able to generate multiple of these which meet Eq and
22 /// implement Hash to meet the PeerManager API.
23 /// For efficiency, Clone should be relatively cheap for this type.
24 /// You probably want to just extend an int and put a file descriptor in a struct and implement
25 /// send_data. Note that if you are using a higher-level net library that may close() itself, be
26 /// careful to ensure you don't have races whereby you might register a new connection with an fd
27 /// the same as a yet-to-be-disconnect_event()-ed.
28 pub trait SocketDescriptor : cmp::Eq + hash::Hash + Clone {
29 /// Attempts to send some data from the given Vec starting at the given offset to the peer.
30 /// Returns the amount of data which was sent, possibly 0 if the socket has since disconnected.
31 /// Note that in the disconnected case, a disconnect_event must still fire and further write
32 /// attempts may occur until that time.
33 /// If the returned size is smaller than data.len() - write_offset, a write_available event must
34 /// trigger the next time more data can be written. Additionally, until the a send_data event
35 /// completes fully, no further read_events should trigger on the same peer!
36 /// If a read_event on this descriptor had previously returned true (indicating that read
37 /// events should be paused to prevent DoS in the send buffer), resume_read may be set
38 /// indicating that read events on this descriptor should resume. A resume_read of false does
39 /// *not* imply that further read events should be paused.
40 fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, resume_read: bool) -> usize;
41 /// Disconnect the socket pointed to by this SocketDescriptor. Once this function returns, no
42 /// more calls to write_event, read_event or disconnect_event may be made with this descriptor.
43 /// No disconnect_event should be generated as a result of this call, though obviously races
44 /// may occur whereby disconnect_socket is called after a call to disconnect_event but prior to
45 /// that event completing.
46 fn disconnect_socket(&mut self);
49 /// Error for PeerManager errors. If you get one of these, you must disconnect the socket and
50 /// generate no further read/write_events for the descriptor, only triggering a single
51 /// disconnect_event (unless it was provided in response to a new_*_connection event, in which case
52 /// no such disconnect_event must be generated and the socket be silently disconencted).
53 pub struct PeerHandleError {
54 no_connection_possible: bool,
56 impl fmt::Debug for PeerHandleError {
57 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
58 formatter.write_str("Peer Sent Invalid Data")
61 impl fmt::Display for PeerHandleError {
62 fn fmt(&self, formatter: &mut fmt::Formatter) -> Result<(), fmt::Error> {
63 formatter.write_str("Peer Sent Invalid Data")
66 impl error::Error for PeerHandleError {
67 fn description(&self) -> &str {
68 "Peer Sent Invalid Data"
73 channel_encryptor: PeerChannelEncryptor,
75 their_node_id: Option<PublicKey>,
76 their_global_features: Option<msgs::GlobalFeatures>,
77 their_local_features: Option<msgs::LocalFeatures>,
79 pending_outbound_buffer: LinkedList<Vec<u8>>,
80 pending_outbound_buffer_first_msg_offset: usize,
81 awaiting_write_event: bool,
83 pending_read_buffer: Vec<u8>,
84 pending_read_buffer_pos: usize,
85 pending_read_is_header: bool,
88 struct PeerHolder<Descriptor: SocketDescriptor> {
89 peers: HashMap<Descriptor, Peer>,
90 /// Only add to this set when noise completes:
91 node_id_to_descriptor: HashMap<PublicKey, Descriptor>,
94 pub struct PeerManager<Descriptor: SocketDescriptor> {
95 message_handler: MessageHandler,
96 peers: Mutex<PeerHolder<Descriptor>>,
97 pending_events: Mutex<Vec<Event>>,
98 our_node_secret: SecretKey,
99 initial_syncs_sent: AtomicUsize,
104 macro_rules! encode_msg {
105 ($msg: expr, $msg_code: expr) => {
107 let just_msg = $msg.encode();
108 let mut encoded_msg = Vec::with_capacity(just_msg.len() + 2);
109 encoded_msg.extend_from_slice(&byte_utils::be16_to_array($msg_code));
110 encoded_msg.extend_from_slice(&just_msg[..]);
116 //TODO: Really should do something smarter for this
117 const INITIAL_SYNCS_TO_SEND: usize = 5;
119 /// Manages and reacts to connection events. You probably want to use file descriptors as PeerIds.
120 /// PeerIds may repeat, but only after disconnect_event() has been called.
121 impl<Descriptor: SocketDescriptor> PeerManager<Descriptor> {
122 pub fn new(message_handler: MessageHandler, our_node_secret: SecretKey, logger: Arc<Logger>) -> PeerManager<Descriptor> {
124 message_handler: message_handler,
125 peers: Mutex::new(PeerHolder { peers: HashMap::new(), node_id_to_descriptor: HashMap::new() }),
126 pending_events: Mutex::new(Vec::new()),
127 our_node_secret: our_node_secret,
128 initial_syncs_sent: AtomicUsize::new(0),
133 /// Get the list of node ids for peers which have completed the initial handshake.
134 /// For outbound connections, this will be the same as the their_node_id parameter passed in to
135 /// new_outbound_connection, however entries will only appear once the initial handshake has
136 /// completed and we are sure the remote peer has the private key for the given node_id.
137 pub fn get_peer_node_ids(&self) -> Vec<PublicKey> {
138 let peers = self.peers.lock().unwrap();
139 peers.peers.values().filter_map(|p| p.their_node_id).collect()
142 /// Indicates a new outbound connection has been established to a node with the given node_id.
143 /// Note that if an Err is returned here you MUST NOT call disconnect_event for the new
144 /// descriptor but must disconnect the connection immediately.
145 /// Returns some bytes to send to the remote node.
146 /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
147 /// disconnect_event.
148 pub fn new_outbound_connection(&self, their_node_id: PublicKey, descriptor: Descriptor) -> Result<Vec<u8>, PeerHandleError> {
149 let mut peer_encryptor = PeerChannelEncryptor::new_outbound(their_node_id.clone());
150 let res = peer_encryptor.get_act_one().to_vec();
151 let pending_read_buffer = [0; 50].to_vec(); // Noise act two is 50 bytes
153 let mut peers = self.peers.lock().unwrap();
154 if peers.peers.insert(descriptor, Peer {
155 channel_encryptor: peer_encryptor,
157 their_node_id: Some(their_node_id),
158 their_global_features: None,
159 their_local_features: None,
161 pending_outbound_buffer: LinkedList::new(),
162 pending_outbound_buffer_first_msg_offset: 0,
163 awaiting_write_event: false,
165 pending_read_buffer: pending_read_buffer,
166 pending_read_buffer_pos: 0,
167 pending_read_is_header: false,
169 panic!("PeerManager driver duplicated descriptors!");
174 /// Indicates a new inbound connection has been established.
175 /// May refuse the connection by returning an Err, but will never write bytes to the remote end
176 /// (outbound connector always speaks first). Note that if an Err is returned here you MUST NOT
177 /// call disconnect_event for the new descriptor but must disconnect the connection
179 /// Panics if descriptor is duplicative with some other descriptor which has not yet has a
180 /// disconnect_event.
181 pub fn new_inbound_connection(&self, descriptor: Descriptor) -> Result<(), PeerHandleError> {
182 let peer_encryptor = PeerChannelEncryptor::new_inbound(&self.our_node_secret);
183 let pending_read_buffer = [0; 50].to_vec(); // Noise act one is 50 bytes
185 let mut peers = self.peers.lock().unwrap();
186 if peers.peers.insert(descriptor, Peer {
187 channel_encryptor: peer_encryptor,
190 their_global_features: None,
191 their_local_features: None,
193 pending_outbound_buffer: LinkedList::new(),
194 pending_outbound_buffer_first_msg_offset: 0,
195 awaiting_write_event: false,
197 pending_read_buffer: pending_read_buffer,
198 pending_read_buffer_pos: 0,
199 pending_read_is_header: false,
201 panic!("PeerManager driver duplicated descriptors!");
206 fn do_attempt_write_data(descriptor: &mut Descriptor, peer: &mut Peer) {
207 while !peer.awaiting_write_event {
209 let next_buff = match peer.pending_outbound_buffer.front() {
213 let should_be_reading = peer.pending_outbound_buffer.len() < 10;
215 let data_sent = descriptor.send_data(next_buff, peer.pending_outbound_buffer_first_msg_offset, should_be_reading);
216 peer.pending_outbound_buffer_first_msg_offset += data_sent;
217 if peer.pending_outbound_buffer_first_msg_offset == next_buff.len() { true } else { false }
219 peer.pending_outbound_buffer_first_msg_offset = 0;
220 peer.pending_outbound_buffer.pop_front();
222 peer.awaiting_write_event = true;
227 /// Indicates that there is room to write data to the given socket descriptor.
228 /// May return an Err to indicate that the connection should be closed.
229 /// Will most likely call send_data on the descriptor passed in (or the descriptor handed into
230 /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
231 /// invariants around calling write_event in case a write did not fully complete must still
232 /// hold - be ready to call write_event again if a write call generated here isn't sufficient!
233 /// Panics if the descriptor was not previously registered in a new_*_connection event.
234 pub fn write_event(&self, descriptor: &mut Descriptor) -> Result<(), PeerHandleError> {
235 let mut peers = self.peers.lock().unwrap();
236 match peers.peers.get_mut(descriptor) {
237 None => panic!("Descriptor for write_event is not already known to PeerManager"),
239 peer.awaiting_write_event = false;
240 Self::do_attempt_write_data(descriptor, peer);
246 /// Indicates that data was read from the given socket descriptor.
247 /// May return an Err to indicate that the connection should be closed.
248 /// Will very likely call send_data on the descriptor passed in (or a descriptor handed into
249 /// new_*_connection) before returning. Thus, be very careful with reentrancy issues! The
250 /// invariants around calling write_event in case a write did not fully complete must still
251 /// hold. Note that this function will often call send_data on many peers before returning, not
253 /// If Ok(true) is returned, further read_events should not be triggered until a write_event on
254 /// this file descriptor has resume_read set (preventing DoS issues in the send buffer). Note
255 /// that this must be true even if a send_data call with resume_read=true was made during the
256 /// course of this function!
257 /// Panics if the descriptor was not previously registered in a new_*_connection event.
258 pub fn read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
259 match self.do_read_event(peer_descriptor, data) {
262 self.disconnect_event_internal(peer_descriptor, e.no_connection_possible);
268 fn do_read_event(&self, peer_descriptor: &mut Descriptor, data: Vec<u8>) -> Result<bool, PeerHandleError> {
270 let mut peers = self.peers.lock().unwrap();
271 let (should_insert_node_id, pause_read) = match peers.peers.get_mut(peer_descriptor) {
272 None => panic!("Descriptor for read_event is not already known to PeerManager"),
274 assert!(peer.pending_read_buffer.len() > 0);
275 assert!(peer.pending_read_buffer.len() > peer.pending_read_buffer_pos);
277 let mut insert_node_id = None;
278 let mut read_pos = 0;
279 while read_pos < data.len() {
281 let data_to_copy = cmp::min(peer.pending_read_buffer.len() - peer.pending_read_buffer_pos, data.len() - read_pos);
282 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]);
283 read_pos += data_to_copy;
284 peer.pending_read_buffer_pos += data_to_copy;
287 if peer.pending_read_buffer_pos == peer.pending_read_buffer.len() {
288 peer.pending_read_buffer_pos = 0;
290 macro_rules! encode_and_send_msg {
291 ($msg: expr, $msg_code: expr) => {
293 log_trace!(self, "Encoding and sending message of type {} to {}", $msg_code, log_pubkey!(peer.their_node_id.unwrap()));
294 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!($msg, $msg_code)[..]));
299 macro_rules! try_potential_handleerror {
304 if let Some(action) = e.action {
306 msgs::ErrorAction::DisconnectPeer { msg: _ } => {
307 //TODO: Try to push msg
308 log_trace!(self, "Got Err handling message, disconnecting peer because {}", e.err);
309 return Err(PeerHandleError{ no_connection_possible: false });
311 msgs::ErrorAction::IgnoreError => {
312 log_trace!(self, "Got Err handling message, ignoring because {}", e.err);
315 msgs::ErrorAction::SendErrorMessage { msg } => {
316 log_trace!(self, "Got Err handling message, sending Error message because {}", e.err);
317 encode_and_send_msg!(msg, 17);
322 log_debug!(self, "Got Err handling message, action not yet filled in: {}", e.err);
323 return Err(PeerHandleError{ no_connection_possible: false });
330 macro_rules! try_potential_decodeerror {
336 return Err(PeerHandleError{ no_connection_possible: false });
342 macro_rules! try_ignore_potential_decodeerror {
347 log_debug!(self, "Error decoding message, ignoring due to lnd spec incompatibility. See https://github.com/lightningnetwork/lnd/issues/1407");
354 let next_step = peer.channel_encryptor.get_noise_step();
356 NextNoiseStep::ActOne => {
357 let act_two = try_potential_handleerror!(peer.channel_encryptor.process_act_one_with_key(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
358 peer.pending_outbound_buffer.push_back(act_two);
359 peer.pending_read_buffer = [0; 66].to_vec(); // act three is 66 bytes long
361 NextNoiseStep::ActTwo => {
362 let act_three = try_potential_handleerror!(peer.channel_encryptor.process_act_two(&peer.pending_read_buffer[..], &self.our_node_secret)).to_vec();
363 peer.pending_outbound_buffer.push_back(act_three);
364 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
365 peer.pending_read_is_header = true;
367 insert_node_id = Some(peer.their_node_id.unwrap());
368 let mut local_features = msgs::LocalFeatures::new();
369 if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
370 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
371 local_features.set_initial_routing_sync();
373 encode_and_send_msg!(msgs::Init {
374 global_features: msgs::GlobalFeatures::new(),
378 NextNoiseStep::ActThree => {
379 let their_node_id = try_potential_handleerror!(peer.channel_encryptor.process_act_three(&peer.pending_read_buffer[..]));
380 peer.pending_read_buffer = [0; 18].to_vec(); // Message length header is 18 bytes
381 peer.pending_read_is_header = true;
382 peer.their_node_id = Some(their_node_id);
383 insert_node_id = Some(peer.their_node_id.unwrap());
385 NextNoiseStep::NoiseComplete => {
386 if peer.pending_read_is_header {
387 let msg_len = try_potential_handleerror!(peer.channel_encryptor.decrypt_length_header(&peer.pending_read_buffer[..]));
388 peer.pending_read_buffer = Vec::with_capacity(msg_len as usize + 16);
389 peer.pending_read_buffer.resize(msg_len as usize + 16, 0);
390 if msg_len < 2 { // Need at least the message type tag
391 return Err(PeerHandleError{ no_connection_possible: false });
393 peer.pending_read_is_header = false;
395 let msg_data = try_potential_handleerror!(peer.channel_encryptor.decrypt_message(&peer.pending_read_buffer[..]));
396 assert!(msg_data.len() >= 2);
399 peer.pending_read_buffer = [0; 18].to_vec();
400 peer.pending_read_is_header = true;
402 let msg_type = byte_utils::slice_to_be16(&msg_data[0..2]);
403 log_trace!(self, "Received message of type {} from {}", msg_type, log_pubkey!(peer.their_node_id.unwrap()));
404 if msg_type != 16 && peer.their_global_features.is_none() {
405 // Need an init message as first message
406 return Err(PeerHandleError{ no_connection_possible: false });
409 // Connection control:
411 let msg = try_potential_decodeerror!(msgs::Init::decode(&msg_data[2..]));
412 if msg.global_features.requires_unknown_bits() {
413 return Err(PeerHandleError{ no_connection_possible: true });
415 if msg.local_features.requires_unknown_bits() {
416 return Err(PeerHandleError{ no_connection_possible: true });
418 peer.their_global_features = Some(msg.global_features);
419 peer.their_local_features = Some(msg.local_features);
422 let mut local_features = msgs::LocalFeatures::new();
423 if self.initial_syncs_sent.load(Ordering::Acquire) < INITIAL_SYNCS_TO_SEND {
424 self.initial_syncs_sent.fetch_add(1, Ordering::AcqRel);
425 local_features.set_initial_routing_sync();
427 encode_and_send_msg!(msgs::Init {
428 global_features: msgs::GlobalFeatures::new(),
434 let msg = try_potential_decodeerror!(msgs::ErrorMessage::decode(&msg_data[2..]));
435 let mut data_is_printable = true;
436 for b in msg.data.bytes() {
437 if b < 32 || b > 126 {
438 data_is_printable = false;
443 if data_is_printable {
444 log_debug!(self, "Got Err message from {}: {}", log_pubkey!(peer.their_node_id.unwrap()), msg.data);
446 log_debug!(self, "Got Err message from {} with non-ASCII error message", log_pubkey!(peer.their_node_id.unwrap()));
448 self.message_handler.chan_handler.handle_error(&peer.their_node_id.unwrap(), &msg);
449 if msg.channel_id == [0; 32] {
450 return Err(PeerHandleError{ no_connection_possible: true });
455 let msg = try_potential_decodeerror!(msgs::Ping::decode(&msg_data[2..]));
456 if msg.ponglen < 65532 {
457 let resp = msgs::Pong { byteslen: msg.ponglen };
458 encode_and_send_msg!(resp, 19);
462 try_potential_decodeerror!(msgs::Pong::decode(&msg_data[2..]));
467 let msg = try_potential_decodeerror!(msgs::OpenChannel::decode(&msg_data[2..]));
468 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_open_channel(&peer.their_node_id.unwrap(), &msg));
469 encode_and_send_msg!(resp, 33);
472 let msg = try_potential_decodeerror!(msgs::AcceptChannel::decode(&msg_data[2..]));
473 try_potential_handleerror!(self.message_handler.chan_handler.handle_accept_channel(&peer.their_node_id.unwrap(), &msg));
477 let msg = try_potential_decodeerror!(msgs::FundingCreated::decode(&msg_data[2..]));
478 let resp = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_created(&peer.their_node_id.unwrap(), &msg));
479 encode_and_send_msg!(resp, 35);
482 let msg = try_potential_decodeerror!(msgs::FundingSigned::decode(&msg_data[2..]));
483 try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_signed(&peer.their_node_id.unwrap(), &msg));
486 let msg = try_potential_decodeerror!(msgs::FundingLocked::decode(&msg_data[2..]));
487 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_funding_locked(&peer.their_node_id.unwrap(), &msg));
489 Some(resp) => encode_and_send_msg!(resp, 259),
495 let msg = try_potential_decodeerror!(msgs::Shutdown::decode(&msg_data[2..]));
496 let resp_options = try_potential_handleerror!(self.message_handler.chan_handler.handle_shutdown(&peer.their_node_id.unwrap(), &msg));
497 if let Some(resp) = resp_options.0 {
498 encode_and_send_msg!(resp, 38);
500 if let Some(resp) = resp_options.1 {
501 encode_and_send_msg!(resp, 39);
505 let msg = try_potential_decodeerror!(msgs::ClosingSigned::decode(&msg_data[2..]));
506 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_closing_signed(&peer.their_node_id.unwrap(), &msg));
507 if let Some(resp) = resp_option {
508 encode_and_send_msg!(resp, 39);
513 let msg = try_potential_decodeerror!(msgs::UpdateAddHTLC::decode(&msg_data[2..]));
514 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_add_htlc(&peer.their_node_id.unwrap(), &msg));
517 let msg = try_potential_decodeerror!(msgs::UpdateFulfillHTLC::decode(&msg_data[2..]));
518 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fulfill_htlc(&peer.their_node_id.unwrap(), &msg));
521 let msg = try_potential_decodeerror!(msgs::UpdateFailHTLC::decode(&msg_data[2..]));
522 let chan_update = try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_htlc(&peer.their_node_id.unwrap(), &msg));
523 if let Some(update) = chan_update {
524 self.message_handler.route_handler.handle_htlc_fail_channel_update(&update);
528 let msg = try_potential_decodeerror!(msgs::UpdateFailMalformedHTLC::decode(&msg_data[2..]));
529 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fail_malformed_htlc(&peer.their_node_id.unwrap(), &msg));
533 let msg = try_potential_decodeerror!(msgs::CommitmentSigned::decode(&msg_data[2..]));
534 let resps = try_potential_handleerror!(self.message_handler.chan_handler.handle_commitment_signed(&peer.their_node_id.unwrap(), &msg));
535 encode_and_send_msg!(resps.0, 133);
536 if let Some(resp) = resps.1 {
537 encode_and_send_msg!(resp, 132);
541 let msg = try_potential_decodeerror!(msgs::RevokeAndACK::decode(&msg_data[2..]));
542 let resp_option = try_potential_handleerror!(self.message_handler.chan_handler.handle_revoke_and_ack(&peer.their_node_id.unwrap(), &msg));
545 for resp in resps.update_add_htlcs {
546 encode_and_send_msg!(resp, 128);
548 for resp in resps.update_fulfill_htlcs {
549 encode_and_send_msg!(resp, 130);
551 for resp in resps.update_fail_htlcs {
552 encode_and_send_msg!(resp, 131);
554 encode_and_send_msg!(resps.commitment_signed, 132);
560 let msg = try_potential_decodeerror!(msgs::UpdateFee::decode(&msg_data[2..]));
561 try_potential_handleerror!(self.message_handler.chan_handler.handle_update_fee(&peer.their_node_id.unwrap(), &msg));
563 136 => { }, // TODO: channel_reestablish
567 let msg = try_potential_decodeerror!(msgs::AnnouncementSignatures::decode(&msg_data[2..]));
568 try_potential_handleerror!(self.message_handler.chan_handler.handle_announcement_signatures(&peer.their_node_id.unwrap(), &msg));
571 let msg = try_potential_decodeerror!(msgs::ChannelAnnouncement::decode(&msg_data[2..]));
572 let should_forward = try_potential_handleerror!(self.message_handler.route_handler.handle_channel_announcement(&msg));
575 // TODO: forward msg along to all our other peers!
579 let msg = try_ignore_potential_decodeerror!(msgs::NodeAnnouncement::decode(&msg_data[2..]));
580 try_potential_handleerror!(self.message_handler.route_handler.handle_node_announcement(&msg));
583 let msg = try_potential_decodeerror!(msgs::ChannelUpdate::decode(&msg_data[2..]));
584 try_potential_handleerror!(self.message_handler.route_handler.handle_channel_update(&msg));
587 if (msg_type & 1) == 0 {
588 return Err(PeerHandleError{ no_connection_possible: true });
598 Self::do_attempt_write_data(peer_descriptor, peer);
600 (insert_node_id /* should_insert_node_id */, peer.pending_outbound_buffer.len() > 10) // pause_read
604 match should_insert_node_id {
605 Some(node_id) => { peers.node_id_to_descriptor.insert(node_id, peer_descriptor.clone()); },
612 self.process_events();
617 /// Checks for any events generated by our handlers and processes them. May be needed after eg
618 /// calls to ChannelManager::process_pending_htlc_forward.
619 pub fn process_events(&self) {
620 let mut upstream_events = Vec::new();
622 // TODO: There are some DoS attacks here where you can flood someone's outbound send
623 // buffer by doing things like announcing channels on another node. We should be willing to
624 // drop optional-ish messages when send buffers get full!
626 let mut events_generated = self.message_handler.chan_handler.get_and_clear_pending_events();
627 let mut peers = self.peers.lock().unwrap();
628 for event in events_generated.drain(..) {
629 macro_rules! get_peer_for_forwarding {
630 ($node_id: expr, $handle_no_such_peer: block) => {
632 let descriptor = match peers.node_id_to_descriptor.get($node_id) {
633 Some(descriptor) => descriptor.clone(),
635 $handle_no_such_peer;
639 match peers.peers.get_mut(&descriptor) {
641 if peer.their_global_features.is_none() {
642 $handle_no_such_peer;
647 None => panic!("Inconsistent peers set state!"),
653 Event::FundingGenerationReady {..} => { /* Hand upstream */ },
654 Event::FundingBroadcastSafe {..} => { /* Hand upstream */ },
655 Event::PaymentReceived {..} => { /* Hand upstream */ },
656 Event::PaymentSent {..} => { /* Hand upstream */ },
657 Event::PaymentFailed {..} => { /* Hand upstream */ },
658 Event::PendingHTLCsForwardable {..} => { /* Hand upstream */ },
660 Event::SendOpenChannel { ref node_id, ref msg } => {
661 log_trace!(self, "Handling SendOpenChannel event in peer_handler for node {} for channel {}",
662 log_pubkey!(node_id),
663 log_bytes!(msg.temporary_channel_id));
664 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
665 //TODO: Drop the pending channel? (or just let it timeout, but that sucks)
667 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 32)));
668 Self::do_attempt_write_data(&mut descriptor, peer);
671 Event::SendFundingCreated { ref node_id, ref msg } => {
672 log_trace!(self, "Handling SendFundingCreated event in peer_handler for node {} for channel {} (which becomes {})",
673 log_pubkey!(node_id),
674 log_bytes!(msg.temporary_channel_id),
675 log_funding_channel_id!(msg.funding_txid, msg.funding_output_index));
676 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
677 //TODO: generate a DiscardFunding event indicating to the wallet that
678 //they should just throw away this funding transaction
680 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 34)));
681 Self::do_attempt_write_data(&mut descriptor, peer);
684 Event::SendFundingLocked { ref node_id, ref msg, ref announcement_sigs } => {
685 log_trace!(self, "Handling SendFundingLocked event in peer_handler for node {}{} for channel {}",
686 log_pubkey!(node_id),
687 if announcement_sigs.is_some() { " with announcement sigs" } else { "" },
688 log_bytes!(msg.channel_id));
689 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
690 //TODO: Do whatever we're gonna do for handling dropped messages
692 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 36)));
693 match announcement_sigs {
694 &Some(ref announce_msg) => peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(announce_msg, 259))),
697 Self::do_attempt_write_data(&mut descriptor, peer);
700 Event::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 commitment_signed } } => {
701 log_trace!(self, "Handling UpdateHTLCs event in peer_handler for node {} with {} adds, {} fulfills, {} fails for channel {}",
702 log_pubkey!(node_id),
703 update_add_htlcs.len(),
704 update_fulfill_htlcs.len(),
705 update_fail_htlcs.len(),
706 log_bytes!(commitment_signed.channel_id));
707 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
708 //TODO: Do whatever we're gonna do for handling dropped messages
710 for msg in update_add_htlcs {
711 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 128)));
713 for msg in update_fulfill_htlcs {
714 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 130)));
716 for msg in update_fail_htlcs {
717 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 131)));
719 for msg in update_fail_malformed_htlcs {
720 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 135)));
722 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(commitment_signed, 132)));
723 Self::do_attempt_write_data(&mut descriptor, peer);
726 Event::SendShutdown { ref node_id, ref msg } => {
727 log_trace!(self, "Handling Shutdown event in peer_handler for node {} for channel {}",
728 log_pubkey!(node_id),
729 log_bytes!(msg.channel_id));
730 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
731 //TODO: Do whatever we're gonna do for handling dropped messages
733 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 38)));
734 Self::do_attempt_write_data(&mut descriptor, peer);
737 Event::BroadcastChannelAnnouncement { ref msg, ref update_msg } => {
738 log_trace!(self, "Handling BroadcastChannelAnnouncement event in peer_handler for short channel id {}", msg.contents.short_channel_id);
739 if self.message_handler.route_handler.handle_channel_announcement(msg).is_ok() && self.message_handler.route_handler.handle_channel_update(update_msg).is_ok() {
740 let encoded_msg = encode_msg!(msg, 256);
741 let encoded_update_msg = encode_msg!(update_msg, 258);
743 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
744 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
747 match peer.their_node_id {
749 Some(their_node_id) => {
750 if their_node_id == msg.contents.node_id_1 || their_node_id == msg.contents.node_id_2 {
755 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
756 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_update_msg[..]));
757 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
762 Event::BroadcastChannelUpdate { ref msg } => {
763 log_trace!(self, "Handling BroadcastChannelUpdate event in peer_handler for short channel id {}", msg.contents.short_channel_id);
764 if self.message_handler.route_handler.handle_channel_update(msg).is_ok() {
765 let encoded_msg = encode_msg!(msg, 258);
767 for (ref descriptor, ref mut peer) in peers.peers.iter_mut() {
768 if !peer.channel_encryptor.is_ready_for_encryption() || peer.their_global_features.is_none() {
771 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encoded_msg[..]));
772 Self::do_attempt_write_data(&mut (*descriptor).clone(), peer);
777 Event::HandleError { ref node_id, ref action } => {
778 if let Some(ref action) = *action {
780 msgs::ErrorAction::DisconnectPeer { ref msg } => {
781 if let Some(mut descriptor) = peers.node_id_to_descriptor.remove(node_id) {
782 if let Some(mut peer) = peers.peers.remove(&descriptor) {
783 if let Some(ref msg) = *msg {
784 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with message {}",
785 log_pubkey!(node_id),
787 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
788 // This isn't guaranteed to work, but if there is enough free
789 // room in the send buffer, put the error message there...
790 Self::do_attempt_write_data(&mut descriptor, &mut peer);
792 log_trace!(self, "Handling DisconnectPeer HandleError event in peer_handler for node {} with no message", log_pubkey!(node_id));
795 descriptor.disconnect_socket();
796 self.message_handler.chan_handler.peer_disconnected(&node_id, false);
799 msgs::ErrorAction::IgnoreError => {
802 msgs::ErrorAction::SendErrorMessage { ref msg } => {
803 log_trace!(self, "Handling SendErrorMessage HandleError event in peer_handler for node {} with message {}",
804 log_pubkey!(node_id),
806 let (mut descriptor, peer) = get_peer_for_forwarding!(node_id, {
807 //TODO: Do whatever we're gonna do for handling dropped messages
809 peer.pending_outbound_buffer.push_back(peer.channel_encryptor.encrypt_message(&encode_msg!(msg, 17)));
810 Self::do_attempt_write_data(&mut descriptor, peer);
814 log_error!(self, "Got no-action HandleError Event in peer_handler for node {}, no such events should ever be generated!", log_pubkey!(node_id));
820 upstream_events.push(event);
824 let mut pending_events = self.pending_events.lock().unwrap();
825 for event in upstream_events.drain(..) {
826 pending_events.push(event);
830 /// Indicates that the given socket descriptor's connection is now closed.
831 /// This must be called even if a PeerHandleError was given for a read_event or write_event,
832 /// but must NOT be called if a PeerHandleError was provided out of a new_*_connection event!
833 /// Panics if the descriptor was not previously registered in a successful new_*_connection event.
834 pub fn disconnect_event(&self, descriptor: &Descriptor) {
835 self.disconnect_event_internal(descriptor, false);
838 fn disconnect_event_internal(&self, descriptor: &Descriptor, no_connection_possible: bool) {
839 let mut peers = self.peers.lock().unwrap();
840 let peer_option = peers.peers.remove(descriptor);
842 None => panic!("Descriptor for disconnect_event is not already known to PeerManager"),
844 match peer.their_node_id {
846 peers.node_id_to_descriptor.remove(&node_id);
847 self.message_handler.chan_handler.peer_disconnected(&node_id, no_connection_possible);
856 impl<Descriptor: SocketDescriptor> EventsProvider for PeerManager<Descriptor> {
857 fn get_and_clear_pending_events(&self) -> Vec<Event> {
858 let mut pending_events = self.pending_events.lock().unwrap();
859 let mut ret = Vec::new();
860 mem::swap(&mut ret, &mut *pending_events);
867 use ln::peer_handler::{PeerManager, MessageHandler, SocketDescriptor};
870 use util::test_utils;
871 use util::logger::Logger;
873 use secp256k1::Secp256k1;
874 use secp256k1::key::{SecretKey, PublicKey};
876 use rand::{thread_rng, Rng};
878 use std::sync::{Arc};
880 #[derive(PartialEq, Eq, Clone, Hash)]
881 struct FileDescriptor {
885 impl SocketDescriptor for FileDescriptor {
886 fn send_data(&mut self, data: &Vec<u8>, write_offset: usize, _resume_read: bool) -> usize {
887 assert!(write_offset < data.len());
888 data.len() - write_offset
891 fn disconnect_socket(&mut self) {}
894 fn create_network(peer_count: usize) -> Vec<PeerManager<FileDescriptor>> {
895 let secp_ctx = Secp256k1::new();
896 let mut peers = Vec::new();
897 let mut rng = thread_rng();
898 let logger : Arc<Logger> = Arc::new(test_utils::TestLogger::new());
900 for _ in 0..peer_count {
901 let chan_handler = test_utils::TestChannelMessageHandler::new();
902 let router = test_utils::TestRoutingMessageHandler::new();
904 let mut key_slice = [0;32];
905 rng.fill_bytes(&mut key_slice);
906 SecretKey::from_slice(&secp_ctx, &key_slice).unwrap()
908 let msg_handler = MessageHandler { chan_handler: Arc::new(chan_handler), route_handler: Arc::new(router) };
909 let peer = PeerManager::new(msg_handler, node_id, Arc::clone(&logger));
916 fn establish_connection(peer_a: &PeerManager<FileDescriptor>, peer_b: &PeerManager<FileDescriptor>) {
917 let secp_ctx = Secp256k1::new();
918 let their_id = PublicKey::from_secret_key(&secp_ctx, &peer_b.our_node_secret);
919 let fd = FileDescriptor { fd: 1};
920 peer_a.new_inbound_connection(fd.clone()).unwrap();
921 peer_a.peers.lock().unwrap().node_id_to_descriptor.insert(their_id, fd.clone());
925 fn test_disconnect_peer() {
926 // Simple test which builds a network of PeerManager, connects and brings them to NoiseState::Finished and
927 // push an DisconnectPeer event to remove the node flagged by id
928 let mut peers = create_network(2);
929 establish_connection(&peers[0], &peers[1]);
930 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 1);
932 let secp_ctx = Secp256k1::new();
933 let their_id = PublicKey::from_secret_key(&secp_ctx, &peers[1].our_node_secret);
935 let chan_handler = test_utils::TestChannelMessageHandler::new();
936 chan_handler.pending_events.lock().unwrap().push(events::Event::HandleError {
938 action: Some(msgs::ErrorAction::DisconnectPeer { msg: None }),
940 assert_eq!(chan_handler.pending_events.lock().unwrap().len(), 1);
941 peers[0].message_handler.chan_handler = Arc::new(chan_handler);
943 peers[0].process_events();
944 assert_eq!(peers[0].peers.lock().unwrap().peers.len(), 0);