1 // This file is Copyright its original authors, visible in version control
4 // This file is licensed under the Apache License, Version 2.0 <LICENSE-APACHE
5 // or http://www.apache.org/licenses/LICENSE-2.0> or the MIT license
6 // <LICENSE-MIT or http://opensource.org/licenses/MIT>, at your option.
7 // You may not use this file except in accordance with one or both of these
10 //! A socket handling library for those running in Tokio environments who wish to use
11 //! rust-lightning with native TcpStreams.
13 //! Designed to be as simple as possible, the high-level usage is almost as simple as "hand over a
14 //! TcpStream and a reference to a PeerManager and the rest is handled", except for the
15 //! [Event](../lightning/util/events/enum.Event.html) handling mechanism; see example below.
17 //! The PeerHandler, due to the fire-and-forget nature of this logic, must be an Arc, and must use
18 //! the SocketDescriptor provided here as the PeerHandler's SocketDescriptor.
20 //! Three methods are exposed to register a new connection for handling in tokio::spawn calls; see
21 //! their individual docs for details.
25 //! use std::net::TcpStream;
26 //! use bitcoin::secp256k1::PublicKey;
27 //! use lightning::util::events::{Event, EventHandler, EventsProvider};
28 //! use std::net::SocketAddr;
29 //! use std::sync::Arc;
31 //! // Define concrete types for our high-level objects:
32 //! type TxBroadcaster = dyn lightning::chain::chaininterface::BroadcasterInterface + Send + Sync;
33 //! type FeeEstimator = dyn lightning::chain::chaininterface::FeeEstimator + Send + Sync;
34 //! type Logger = dyn lightning::util::logger::Logger + Send + Sync;
35 //! type ChainAccess = dyn lightning::chain::Access + Send + Sync;
36 //! type ChainFilter = dyn lightning::chain::Filter + Send + Sync;
37 //! type DataPersister = dyn lightning::chain::chainmonitor::Persist<lightning::chain::keysinterface::InMemorySigner> + Send + Sync;
38 //! type ChainMonitor = lightning::chain::chainmonitor::ChainMonitor<lightning::chain::keysinterface::InMemorySigner, Arc<ChainFilter>, Arc<TxBroadcaster>, Arc<FeeEstimator>, Arc<Logger>, Arc<DataPersister>>;
39 //! type ChannelManager = Arc<lightning::ln::channelmanager::SimpleArcChannelManager<ChainMonitor, TxBroadcaster, FeeEstimator, Logger>>;
40 //! type PeerManager = Arc<lightning::ln::peer_handler::SimpleArcPeerManager<lightning_net_tokio::SocketDescriptor, ChainMonitor, TxBroadcaster, FeeEstimator, ChainAccess, Logger>>;
42 //! // Connect to node with pubkey their_node_id at addr:
43 //! async fn connect_to_node(peer_manager: PeerManager, chain_monitor: Arc<ChainMonitor>, channel_manager: ChannelManager, their_node_id: PublicKey, addr: SocketAddr) {
44 //! lightning_net_tokio::connect_outbound(peer_manager, their_node_id, addr).await;
46 //! let event_handler = |event: &Event| {
47 //! // Handle the event!
49 //! channel_manager.await_persistable_update();
50 //! channel_manager.process_pending_events(&event_handler);
51 //! chain_monitor.process_pending_events(&event_handler);
55 //! // Begin reading from a newly accepted socket and talk to the peer:
56 //! async fn accept_socket(peer_manager: PeerManager, chain_monitor: Arc<ChainMonitor>, channel_manager: ChannelManager, socket: TcpStream) {
57 //! lightning_net_tokio::setup_inbound(peer_manager, socket);
59 //! let event_handler = |event: &Event| {
60 //! // Handle the event!
62 //! channel_manager.await_persistable_update();
63 //! channel_manager.process_pending_events(&event_handler);
64 //! chain_monitor.process_pending_events(&event_handler);
69 // Prefix these with `rustdoc::` when we update our MSRV to be >= 1.52 to remove warnings.
70 #![deny(broken_intra_doc_links)]
71 #![deny(private_intra_doc_links)]
73 #![deny(missing_docs)]
74 #![cfg_attr(docsrs, feature(doc_auto_cfg))]
76 use bitcoin::secp256k1::PublicKey;
78 use tokio::net::TcpStream;
79 use tokio::{io, time};
80 use tokio::sync::mpsc;
81 use tokio::io::{AsyncReadExt, AsyncWrite, AsyncWriteExt};
83 use lightning::ln::peer_handler;
84 use lightning::ln::peer_handler::SocketDescriptor as LnSocketTrait;
85 use lightning::ln::peer_handler::CustomMessageHandler;
86 use lightning::ln::msgs::{ChannelMessageHandler, NetAddress, OnionMessageHandler, RoutingMessageHandler};
87 use lightning::util::logger::Logger;
91 use std::net::SocketAddr;
92 use std::net::TcpStream as StdTcpStream;
93 use std::sync::{Arc, Mutex};
94 use std::sync::atomic::{AtomicU64, Ordering};
95 use std::time::Duration;
98 static ID_COUNTER: AtomicU64 = AtomicU64::new(0);
100 /// Connection contains all our internal state for a connection - we hold a reference to the
101 /// Connection object (in an Arc<Mutex<>>) in each SocketDescriptor we create as well as in the
102 /// read future (which is returned by schedule_read).
104 writer: Option<io::WriteHalf<TcpStream>>,
105 // Because our PeerManager is templated by user-provided types, and we can't (as far as I can
106 // tell) have a const RawWakerVTable built out of templated functions, we need some indirection
107 // between being woken up with write-ready and calling PeerManager::write_buffer_space_avail.
108 // This provides that indirection, with a Sender which gets handed to the PeerManager Arc on
109 // the schedule_read stack.
111 // An alternative (likely more effecient) approach would involve creating a RawWakerVTable at
112 // runtime with functions templated by the Arc<PeerManager> type, calling
113 // write_buffer_space_avail directly from tokio's write wake, however doing so would require
114 // more unsafe voodo than I really feel like writing.
115 write_avail: mpsc::Sender<()>,
116 // When we are told by rust-lightning to pause read (because we have writes backing up), we do
117 // so by setting read_paused. At that point, the read task will stop reading bytes from the
118 // socket. To wake it up (without otherwise changing its state, we can push a value into this
120 read_waker: mpsc::Sender<()>,
122 rl_requested_disconnect: bool,
126 async fn poll_event_process<CMH, RMH, OMH, L, UMH>(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor, CMH, RMH, OMH, L, UMH>>, mut event_receiver: mpsc::Receiver<()>) where
127 CMH: Deref + 'static + Send + Sync,
128 RMH: Deref + 'static + Send + Sync,
129 OMH: Deref + 'static + Send + Sync,
130 L: Deref + 'static + Send + Sync,
131 UMH: Deref + 'static + Send + Sync,
132 CMH::Target: ChannelMessageHandler + Send + Sync,
133 RMH::Target: RoutingMessageHandler + Send + Sync,
134 OMH::Target: OnionMessageHandler + Send + Sync,
135 L::Target: Logger + Send + Sync,
136 UMH::Target: CustomMessageHandler + Send + Sync,
139 if event_receiver.recv().await.is_none() {
142 peer_manager.process_events();
146 async fn schedule_read<CMH, RMH, OMH, L, UMH>(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor, CMH, RMH, OMH, L, UMH>>, us: Arc<Mutex<Self>>, mut reader: io::ReadHalf<TcpStream>, mut read_wake_receiver: mpsc::Receiver<()>, mut write_avail_receiver: mpsc::Receiver<()>) where
147 CMH: Deref + 'static + Send + Sync,
148 RMH: Deref + 'static + Send + Sync,
149 OMH: Deref + 'static + Send + Sync,
150 L: Deref + 'static + Send + Sync,
151 UMH: Deref + 'static + Send + Sync,
152 CMH::Target: ChannelMessageHandler + 'static + Send + Sync,
153 RMH::Target: RoutingMessageHandler + 'static + Send + Sync,
154 OMH::Target: OnionMessageHandler + 'static + Send + Sync,
155 L::Target: Logger + 'static + Send + Sync,
156 UMH::Target: CustomMessageHandler + 'static + Send + Sync,
158 // Create a waker to wake up poll_event_process, above
159 let (event_waker, event_receiver) = mpsc::channel(1);
160 tokio::spawn(Self::poll_event_process(Arc::clone(&peer_manager), event_receiver));
162 // 8KB is nice and big but also should never cause any issues with stack overflowing.
163 let mut buf = [0; 8192];
165 let mut our_descriptor = SocketDescriptor::new(us.clone());
166 // An enum describing why we did/are disconnecting:
168 // Rust-Lightning told us to disconnect, either by returning an Err or by calling
169 // SocketDescriptor::disconnect_socket.
170 // In this case, we do not call peer_manager.socket_disconnected() as Rust-Lightning
171 // already knows we're disconnected.
173 // The connection was disconnected for some other reason, ie because the socket was
175 // In this case, we do need to call peer_manager.socket_disconnected() to inform
176 // Rust-Lightning that the socket is gone.
179 let disconnect_type = loop {
181 let us_lock = us.lock().unwrap();
182 if us_lock.rl_requested_disconnect {
183 break Disconnect::CloseConnection;
188 v = write_avail_receiver.recv() => {
189 assert!(v.is_some()); // We can't have dropped the sending end, its in the us Arc!
190 if let Err(_) = peer_manager.write_buffer_space_avail(&mut our_descriptor) {
191 break Disconnect::CloseConnection;
194 _ = read_wake_receiver.recv() => {},
195 read = reader.read(&mut buf), if !read_paused => match read {
196 Ok(0) => break Disconnect::PeerDisconnected,
198 let read_res = peer_manager.read_event(&mut our_descriptor, &buf[0..len]);
199 let mut us_lock = us.lock().unwrap();
203 us_lock.read_paused = true;
206 Err(_) => break Disconnect::CloseConnection,
209 Err(_) => break Disconnect::PeerDisconnected,
212 let _ = event_waker.try_send(());
214 // At this point we've processed a message or two, and reset the ping timer for this
215 // peer, at least in the "are we still receiving messages" context, if we don't give up
216 // our timeslice to another task we may just spin on this peer, starving other peers
217 // and eventually disconnecting them for ping timeouts. Instead, we explicitly yield
219 tokio::task::yield_now().await;
221 let writer_option = us.lock().unwrap().writer.take();
222 if let Some(mut writer) = writer_option {
223 // If the socket is already closed, shutdown() will fail, so just ignore it.
224 let _ = writer.shutdown().await;
226 if let Disconnect::PeerDisconnected = disconnect_type {
227 peer_manager.socket_disconnected(&our_descriptor);
228 peer_manager.process_events();
232 fn new(stream: StdTcpStream) -> (io::ReadHalf<TcpStream>, mpsc::Receiver<()>, mpsc::Receiver<()>, Arc<Mutex<Self>>) {
233 // We only ever need a channel of depth 1 here: if we returned a non-full write to the
234 // PeerManager, we will eventually get notified that there is room in the socket to write
235 // new bytes, which will generate an event. That event will be popped off the queue before
236 // we call write_buffer_space_avail, ensuring that we have room to push a new () if, during
237 // the write_buffer_space_avail() call, send_data() returns a non-full write.
238 let (write_avail, write_receiver) = mpsc::channel(1);
239 // Similarly here - our only goal is to make sure the reader wakes up at some point after
240 // we shove a value into the channel which comes after we've reset the read_paused bool to
242 let (read_waker, read_receiver) = mpsc::channel(1);
243 stream.set_nonblocking(true).unwrap();
244 let (reader, writer) = io::split(TcpStream::from_std(stream).unwrap());
246 (reader, write_receiver, read_receiver,
247 Arc::new(Mutex::new(Self {
248 writer: Some(writer), write_avail, read_waker, read_paused: false,
249 rl_requested_disconnect: false,
250 id: ID_COUNTER.fetch_add(1, Ordering::AcqRel)
255 fn get_addr_from_stream(stream: &StdTcpStream) -> Option<NetAddress> {
256 match stream.peer_addr() {
257 Ok(SocketAddr::V4(sockaddr)) => Some(NetAddress::IPv4 {
258 addr: sockaddr.ip().octets(),
259 port: sockaddr.port(),
261 Ok(SocketAddr::V6(sockaddr)) => Some(NetAddress::IPv6 {
262 addr: sockaddr.ip().octets(),
263 port: sockaddr.port(),
269 /// Process incoming messages and feed outgoing messages on the provided socket generated by
270 /// accepting an incoming connection.
272 /// The returned future will complete when the peer is disconnected and associated handling
273 /// futures are freed, though, because all processing futures are spawned with tokio::spawn, you do
274 /// not need to poll the provided future in order to make progress.
275 pub fn setup_inbound<CMH, RMH, OMH, L, UMH>(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor, CMH, RMH, OMH, L, UMH>>, stream: StdTcpStream) -> impl std::future::Future<Output=()> where
276 CMH: Deref + 'static + Send + Sync,
277 RMH: Deref + 'static + Send + Sync,
278 OMH: Deref + 'static + Send + Sync,
279 L: Deref + 'static + Send + Sync,
280 UMH: Deref + 'static + Send + Sync,
281 CMH::Target: ChannelMessageHandler + Send + Sync,
282 RMH::Target: RoutingMessageHandler + Send + Sync,
283 OMH::Target: OnionMessageHandler + Send + Sync,
284 L::Target: Logger + Send + Sync,
285 UMH::Target: CustomMessageHandler + Send + Sync,
287 let remote_addr = get_addr_from_stream(&stream);
288 let (reader, write_receiver, read_receiver, us) = Connection::new(stream);
289 #[cfg(debug_assertions)]
290 let last_us = Arc::clone(&us);
292 let handle_opt = if let Ok(_) = peer_manager.new_inbound_connection(SocketDescriptor::new(us.clone()), remote_addr) {
293 Some(tokio::spawn(Connection::schedule_read(peer_manager, us, reader, read_receiver, write_receiver)))
295 // Note that we will skip socket_disconnected here, in accordance with the PeerManager
301 if let Some(handle) = handle_opt {
302 if let Err(e) = handle.await {
303 assert!(e.is_cancelled());
305 // This is certainly not guaranteed to always be true - the read loop may exit
306 // while there are still pending write wakers that need to be woken up after the
307 // socket shutdown(). Still, as a check during testing, to make sure tokio doesn't
308 // keep too many wakers around, this makes sense. The race should be rare (we do
309 // some work after shutdown()) and an error would be a major memory leak.
310 #[cfg(debug_assertions)]
311 assert!(Arc::try_unwrap(last_us).is_ok());
317 /// Process incoming messages and feed outgoing messages on the provided socket generated by
318 /// making an outbound connection which is expected to be accepted by a peer with the given
319 /// public key. The relevant processing is set to run free (via tokio::spawn).
321 /// The returned future will complete when the peer is disconnected and associated handling
322 /// futures are freed, though, because all processing futures are spawned with tokio::spawn, you do
323 /// not need to poll the provided future in order to make progress.
324 pub fn setup_outbound<CMH, RMH, OMH, L, UMH>(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor, CMH, RMH, OMH, L, UMH>>, their_node_id: PublicKey, stream: StdTcpStream) -> impl std::future::Future<Output=()> where
325 CMH: Deref + 'static + Send + Sync,
326 RMH: Deref + 'static + Send + Sync,
327 OMH: Deref + 'static + Send + Sync,
328 L: Deref + 'static + Send + Sync,
329 UMH: Deref + 'static + Send + Sync,
330 CMH::Target: ChannelMessageHandler + Send + Sync,
331 RMH::Target: RoutingMessageHandler + Send + Sync,
332 OMH::Target: OnionMessageHandler + Send + Sync,
333 L::Target: Logger + Send + Sync,
334 UMH::Target: CustomMessageHandler + Send + Sync,
336 let remote_addr = get_addr_from_stream(&stream);
337 let (reader, mut write_receiver, read_receiver, us) = Connection::new(stream);
338 #[cfg(debug_assertions)]
339 let last_us = Arc::clone(&us);
340 let handle_opt = if let Ok(initial_send) = peer_manager.new_outbound_connection(their_node_id, SocketDescriptor::new(us.clone()), remote_addr) {
341 Some(tokio::spawn(async move {
342 // We should essentially always have enough room in a TCP socket buffer to send the
343 // initial 10s of bytes. However, tokio running in single-threaded mode will always
344 // fail writes and wake us back up later to write. Thus, we handle a single
345 // std::task::Poll::Pending but still expect to write the full set of bytes at once
346 // and use a relatively tight timeout.
347 if let Ok(Ok(())) = tokio::time::timeout(Duration::from_millis(100), async {
349 match SocketDescriptor::new(us.clone()).send_data(&initial_send, true) {
350 v if v == initial_send.len() => break Ok(()),
352 write_receiver.recv().await;
353 // In theory we could check for if we've been instructed to disconnect
354 // the peer here, but its OK to just skip it - we'll check for it in
355 // schedule_read prior to any relevant calls into RL.
358 eprintln!("Failed to write first full message to socket!");
359 peer_manager.socket_disconnected(&SocketDescriptor::new(Arc::clone(&us)));
365 Connection::schedule_read(peer_manager, us, reader, read_receiver, write_receiver).await;
369 // Note that we will skip socket_disconnected here, in accordance with the PeerManager
375 if let Some(handle) = handle_opt {
376 if let Err(e) = handle.await {
377 assert!(e.is_cancelled());
379 // This is certainly not guaranteed to always be true - the read loop may exit
380 // while there are still pending write wakers that need to be woken up after the
381 // socket shutdown(). Still, as a check during testing, to make sure tokio doesn't
382 // keep too many wakers around, this makes sense. The race should be rare (we do
383 // some work after shutdown()) and an error would be a major memory leak.
384 #[cfg(debug_assertions)]
385 assert!(Arc::try_unwrap(last_us).is_ok());
391 /// Process incoming messages and feed outgoing messages on a new connection made to the given
392 /// socket address which is expected to be accepted by a peer with the given public key (by
393 /// scheduling futures with tokio::spawn).
395 /// Shorthand for TcpStream::connect(addr) with a timeout followed by setup_outbound().
397 /// Returns a future (as the fn is async) which needs to be polled to complete the connection and
398 /// connection setup. That future then returns a future which will complete when the peer is
399 /// disconnected and associated handling futures are freed, though, because all processing in said
400 /// futures are spawned with tokio::spawn, you do not need to poll the second future in order to
402 pub async fn connect_outbound<CMH, RMH, OMH, L, UMH>(peer_manager: Arc<peer_handler::PeerManager<SocketDescriptor, CMH, RMH, OMH, L, UMH>>, their_node_id: PublicKey, addr: SocketAddr) -> Option<impl std::future::Future<Output=()>> where
403 CMH: Deref + 'static + Send + Sync,
404 RMH: Deref + 'static + Send + Sync,
405 OMH: Deref + 'static + Send + Sync,
406 L: Deref + 'static + Send + Sync,
407 UMH: Deref + 'static + Send + Sync,
408 CMH::Target: ChannelMessageHandler + Send + Sync,
409 RMH::Target: RoutingMessageHandler + Send + Sync,
410 OMH::Target: OnionMessageHandler + Send + Sync,
411 L::Target: Logger + Send + Sync,
412 UMH::Target: CustomMessageHandler + Send + Sync,
414 if let Ok(Ok(stream)) = time::timeout(Duration::from_secs(10), async { TcpStream::connect(&addr).await.map(|s| s.into_std().unwrap()) }).await {
415 Some(setup_outbound(peer_manager, their_node_id, stream))
419 const SOCK_WAKER_VTABLE: task::RawWakerVTable =
420 task::RawWakerVTable::new(clone_socket_waker, wake_socket_waker, wake_socket_waker_by_ref, drop_socket_waker);
422 fn clone_socket_waker(orig_ptr: *const ()) -> task::RawWaker {
423 write_avail_to_waker(orig_ptr as *const mpsc::Sender<()>)
425 // When waking, an error should be fine. Most likely we got two send_datas in a row, both of which
426 // failed to fully write, but we only need to call write_buffer_space_avail() once. Otherwise, the
427 // sending thread may have already gone away due to a socket close, in which case there's nothing
428 // to wake up anyway.
429 fn wake_socket_waker(orig_ptr: *const ()) {
430 let sender = unsafe { &mut *(orig_ptr as *mut mpsc::Sender<()>) };
431 let _ = sender.try_send(());
432 drop_socket_waker(orig_ptr);
434 fn wake_socket_waker_by_ref(orig_ptr: *const ()) {
435 let sender_ptr = orig_ptr as *const mpsc::Sender<()>;
436 let sender = unsafe { (*sender_ptr).clone() };
437 let _ = sender.try_send(());
439 fn drop_socket_waker(orig_ptr: *const ()) {
440 let _orig_box = unsafe { Box::from_raw(orig_ptr as *mut mpsc::Sender<()>) };
441 // _orig_box is now dropped
443 fn write_avail_to_waker(sender: *const mpsc::Sender<()>) -> task::RawWaker {
444 let new_box = Box::leak(Box::new(unsafe { (*sender).clone() }));
445 let new_ptr = new_box as *const mpsc::Sender<()>;
446 task::RawWaker::new(new_ptr as *const (), &SOCK_WAKER_VTABLE)
449 /// The SocketDescriptor used to refer to sockets by a PeerHandler. This is pub only as it is a
450 /// type in the template of PeerHandler.
451 pub struct SocketDescriptor {
452 conn: Arc<Mutex<Connection>>,
455 impl SocketDescriptor {
456 fn new(conn: Arc<Mutex<Connection>>) -> Self {
457 let id = conn.lock().unwrap().id;
461 impl peer_handler::SocketDescriptor for SocketDescriptor {
462 fn send_data(&mut self, data: &[u8], resume_read: bool) -> usize {
463 // To send data, we take a lock on our Connection to access the WriteHalf of the TcpStream,
464 // writing to it if there's room in the kernel buffer, or otherwise create a new Waker with
465 // a SocketDescriptor in it which can wake up the write_avail Sender, waking up the
466 // processing future which will call write_buffer_space_avail and we'll end up back here.
467 let mut us = self.conn.lock().unwrap();
468 if us.writer.is_none() {
469 // The writer gets take()n when it is time to shut down, so just fast-return 0 here.
473 if resume_read && us.read_paused {
474 // The schedule_read future may go to lock up but end up getting woken up by there
475 // being more room in the write buffer, dropping the other end of this Sender
476 // before we get here, so we ignore any failures to wake it up.
477 us.read_paused = false;
478 let _ = us.read_waker.try_send(());
480 if data.is_empty() { return 0; }
481 let waker = unsafe { task::Waker::from_raw(write_avail_to_waker(&us.write_avail)) };
482 let mut ctx = task::Context::from_waker(&waker);
483 let mut written_len = 0;
485 match std::pin::Pin::new(us.writer.as_mut().unwrap()).poll_write(&mut ctx, &data[written_len..]) {
486 task::Poll::Ready(Ok(res)) => {
487 // The tokio docs *seem* to indicate this can't happen, and I certainly don't
488 // know how to handle it if it does (cause it should be a Poll::Pending
492 if written_len == data.len() { return written_len; }
494 task::Poll::Ready(Err(e)) => {
495 // The tokio docs *seem* to indicate this can't happen, and I certainly don't
496 // know how to handle it if it does (cause it should be a Poll::Pending
498 assert_ne!(e.kind(), io::ErrorKind::WouldBlock);
499 // Probably we've already been closed, just return what we have and let the
500 // read thread handle closing logic.
503 task::Poll::Pending => {
504 // We're queued up for a write event now, but we need to make sure we also
505 // pause read given we're now waiting on the remote end to ACK (and in
506 // accordance with the send_data() docs).
507 us.read_paused = true;
508 // Further, to avoid any current pending read causing a `read_event` call, wake
509 // up the read_waker and restart its loop.
510 let _ = us.read_waker.try_send(());
517 fn disconnect_socket(&mut self) {
518 let mut us = self.conn.lock().unwrap();
519 us.rl_requested_disconnect = true;
520 // Wake up the sending thread, assuming it is still alive
521 let _ = us.write_avail.try_send(());
524 impl Clone for SocketDescriptor {
525 fn clone(&self) -> Self {
527 conn: Arc::clone(&self.conn),
532 impl Eq for SocketDescriptor {}
533 impl PartialEq for SocketDescriptor {
534 fn eq(&self, o: &Self) -> bool {
538 impl Hash for SocketDescriptor {
539 fn hash<H: std::hash::Hasher>(&self, state: &mut H) {
546 use lightning::ln::features::*;
547 use lightning::ln::msgs::*;
548 use lightning::ln::peer_handler::{MessageHandler, PeerManager};
549 use lightning::ln::features::NodeFeatures;
550 use lightning::util::events::*;
551 use bitcoin::secp256k1::{Secp256k1, SecretKey, PublicKey};
553 use tokio::sync::mpsc;
556 use std::sync::atomic::{AtomicBool, Ordering};
557 use std::sync::{Arc, Mutex};
558 use std::time::Duration;
560 pub struct TestLogger();
561 impl lightning::util::logger::Logger for TestLogger {
562 fn log(&self, record: &lightning::util::logger::Record) {
563 println!("{:<5} [{} : {}, {}] {}", record.level.to_string(), record.module_path, record.file, record.line, record.args);
568 expected_pubkey: PublicKey,
569 pubkey_connected: mpsc::Sender<()>,
570 pubkey_disconnected: mpsc::Sender<()>,
571 disconnected_flag: AtomicBool,
572 msg_events: Mutex<Vec<MessageSendEvent>>,
574 impl RoutingMessageHandler for MsgHandler {
575 fn handle_node_announcement(&self, _msg: &NodeAnnouncement) -> Result<bool, LightningError> { Ok(false) }
576 fn handle_channel_announcement(&self, _msg: &ChannelAnnouncement) -> Result<bool, LightningError> { Ok(false) }
577 fn handle_channel_update(&self, _msg: &ChannelUpdate) -> Result<bool, LightningError> { Ok(false) }
578 fn get_next_channel_announcement(&self, _starting_point: u64) -> Option<(ChannelAnnouncement, Option<ChannelUpdate>, Option<ChannelUpdate>)> { None }
579 fn get_next_node_announcement(&self, _starting_point: Option<&PublicKey>) -> Option<NodeAnnouncement> { None }
580 fn peer_connected(&self, _their_node_id: &PublicKey, _init_msg: &Init) { }
581 fn handle_reply_channel_range(&self, _their_node_id: &PublicKey, _msg: ReplyChannelRange) -> Result<(), LightningError> { Ok(()) }
582 fn handle_reply_short_channel_ids_end(&self, _their_node_id: &PublicKey, _msg: ReplyShortChannelIdsEnd) -> Result<(), LightningError> { Ok(()) }
583 fn handle_query_channel_range(&self, _their_node_id: &PublicKey, _msg: QueryChannelRange) -> Result<(), LightningError> { Ok(()) }
584 fn handle_query_short_channel_ids(&self, _their_node_id: &PublicKey, _msg: QueryShortChannelIds) -> Result<(), LightningError> { Ok(()) }
585 fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::known() }
586 fn provided_init_features(&self, _their_node_id: &PublicKey) -> InitFeatures { InitFeatures::known() }
588 impl ChannelMessageHandler for MsgHandler {
589 fn handle_open_channel(&self, _their_node_id: &PublicKey, _their_features: InitFeatures, _msg: &OpenChannel) {}
590 fn handle_accept_channel(&self, _their_node_id: &PublicKey, _their_features: InitFeatures, _msg: &AcceptChannel) {}
591 fn handle_funding_created(&self, _their_node_id: &PublicKey, _msg: &FundingCreated) {}
592 fn handle_funding_signed(&self, _their_node_id: &PublicKey, _msg: &FundingSigned) {}
593 fn handle_channel_ready(&self, _their_node_id: &PublicKey, _msg: &ChannelReady) {}
594 fn handle_shutdown(&self, _their_node_id: &PublicKey, _their_features: &InitFeatures, _msg: &Shutdown) {}
595 fn handle_closing_signed(&self, _their_node_id: &PublicKey, _msg: &ClosingSigned) {}
596 fn handle_update_add_htlc(&self, _their_node_id: &PublicKey, _msg: &UpdateAddHTLC) {}
597 fn handle_update_fulfill_htlc(&self, _their_node_id: &PublicKey, _msg: &UpdateFulfillHTLC) {}
598 fn handle_update_fail_htlc(&self, _their_node_id: &PublicKey, _msg: &UpdateFailHTLC) {}
599 fn handle_update_fail_malformed_htlc(&self, _their_node_id: &PublicKey, _msg: &UpdateFailMalformedHTLC) {}
600 fn handle_commitment_signed(&self, _their_node_id: &PublicKey, _msg: &CommitmentSigned) {}
601 fn handle_revoke_and_ack(&self, _their_node_id: &PublicKey, _msg: &RevokeAndACK) {}
602 fn handle_update_fee(&self, _their_node_id: &PublicKey, _msg: &UpdateFee) {}
603 fn handle_announcement_signatures(&self, _their_node_id: &PublicKey, _msg: &AnnouncementSignatures) {}
604 fn handle_channel_update(&self, _their_node_id: &PublicKey, _msg: &ChannelUpdate) {}
605 fn peer_disconnected(&self, their_node_id: &PublicKey, _no_connection_possible: bool) {
606 if *their_node_id == self.expected_pubkey {
607 self.disconnected_flag.store(true, Ordering::SeqCst);
608 self.pubkey_disconnected.clone().try_send(()).unwrap();
611 fn peer_connected(&self, their_node_id: &PublicKey, _msg: &Init) {
612 if *their_node_id == self.expected_pubkey {
613 self.pubkey_connected.clone().try_send(()).unwrap();
616 fn handle_channel_reestablish(&self, _their_node_id: &PublicKey, _msg: &ChannelReestablish) {}
617 fn handle_error(&self, _their_node_id: &PublicKey, _msg: &ErrorMessage) {}
618 fn provided_node_features(&self) -> NodeFeatures { NodeFeatures::known() }
619 fn provided_init_features(&self, _their_node_id: &PublicKey) -> InitFeatures { InitFeatures::known() }
621 impl MessageSendEventsProvider for MsgHandler {
622 fn get_and_clear_pending_msg_events(&self) -> Vec<MessageSendEvent> {
623 let mut ret = Vec::new();
624 mem::swap(&mut *self.msg_events.lock().unwrap(), &mut ret);
629 fn make_tcp_connection() -> (std::net::TcpStream, std::net::TcpStream) {
630 if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:9735") {
631 (std::net::TcpStream::connect("127.0.0.1:9735").unwrap(), listener.accept().unwrap().0)
632 } else if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:19735") {
633 (std::net::TcpStream::connect("127.0.0.1:19735").unwrap(), listener.accept().unwrap().0)
634 } else if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:9997") {
635 (std::net::TcpStream::connect("127.0.0.1:9997").unwrap(), listener.accept().unwrap().0)
636 } else if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:9998") {
637 (std::net::TcpStream::connect("127.0.0.1:9998").unwrap(), listener.accept().unwrap().0)
638 } else if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:9999") {
639 (std::net::TcpStream::connect("127.0.0.1:9999").unwrap(), listener.accept().unwrap().0)
640 } else if let Ok(listener) = std::net::TcpListener::bind("127.0.0.1:46926") {
641 (std::net::TcpStream::connect("127.0.0.1:46926").unwrap(), listener.accept().unwrap().0)
642 } else { panic!("Failed to bind to v4 localhost on common ports"); }
645 async fn do_basic_connection_test() {
646 let secp_ctx = Secp256k1::new();
647 let a_key = SecretKey::from_slice(&[1; 32]).unwrap();
648 let b_key = SecretKey::from_slice(&[1; 32]).unwrap();
649 let a_pub = PublicKey::from_secret_key(&secp_ctx, &a_key);
650 let b_pub = PublicKey::from_secret_key(&secp_ctx, &b_key);
652 let (a_connected_sender, mut a_connected) = mpsc::channel(1);
653 let (a_disconnected_sender, mut a_disconnected) = mpsc::channel(1);
654 let a_handler = Arc::new(MsgHandler {
655 expected_pubkey: b_pub,
656 pubkey_connected: a_connected_sender,
657 pubkey_disconnected: a_disconnected_sender,
658 disconnected_flag: AtomicBool::new(false),
659 msg_events: Mutex::new(Vec::new()),
661 let a_manager = Arc::new(PeerManager::new(MessageHandler {
662 chan_handler: Arc::clone(&a_handler),
663 route_handler: Arc::clone(&a_handler),
664 onion_message_handler: Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{}),
665 }, a_key.clone(), 0, &[1; 32], Arc::new(TestLogger()), Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{})));
667 let (b_connected_sender, mut b_connected) = mpsc::channel(1);
668 let (b_disconnected_sender, mut b_disconnected) = mpsc::channel(1);
669 let b_handler = Arc::new(MsgHandler {
670 expected_pubkey: a_pub,
671 pubkey_connected: b_connected_sender,
672 pubkey_disconnected: b_disconnected_sender,
673 disconnected_flag: AtomicBool::new(false),
674 msg_events: Mutex::new(Vec::new()),
676 let b_manager = Arc::new(PeerManager::new(MessageHandler {
677 chan_handler: Arc::clone(&b_handler),
678 route_handler: Arc::clone(&b_handler),
679 onion_message_handler: Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{}),
680 }, b_key.clone(), 0, &[2; 32], Arc::new(TestLogger()), Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{})));
682 // We bind on localhost, hoping the environment is properly configured with a local
683 // address. This may not always be the case in containers and the like, so if this test is
684 // failing for you check that you have a loopback interface and it is configured with
686 let (conn_a, conn_b) = make_tcp_connection();
688 let fut_a = super::setup_outbound(Arc::clone(&a_manager), b_pub, conn_a);
689 let fut_b = super::setup_inbound(b_manager, conn_b);
691 tokio::time::timeout(Duration::from_secs(10), a_connected.recv()).await.unwrap();
692 tokio::time::timeout(Duration::from_secs(1), b_connected.recv()).await.unwrap();
694 a_handler.msg_events.lock().unwrap().push(MessageSendEvent::HandleError {
695 node_id: b_pub, action: ErrorAction::DisconnectPeer { msg: None }
697 assert!(!a_handler.disconnected_flag.load(Ordering::SeqCst));
698 assert!(!b_handler.disconnected_flag.load(Ordering::SeqCst));
700 a_manager.process_events();
701 tokio::time::timeout(Duration::from_secs(10), a_disconnected.recv()).await.unwrap();
702 tokio::time::timeout(Duration::from_secs(1), b_disconnected.recv()).await.unwrap();
703 assert!(a_handler.disconnected_flag.load(Ordering::SeqCst));
704 assert!(b_handler.disconnected_flag.load(Ordering::SeqCst));
710 #[tokio::test(flavor = "multi_thread")]
711 async fn basic_threaded_connection_test() {
712 do_basic_connection_test().await;
716 async fn basic_unthreaded_connection_test() {
717 do_basic_connection_test().await;
720 async fn race_disconnect_accept() {
721 // Previously, if we handed an already-disconnected socket to `setup_inbound` we'd panic.
722 // This attempts to find other similar races by opening connections and shutting them down
723 // while connecting. Sadly in testing this did *not* reproduce the previous issue.
724 let secp_ctx = Secp256k1::new();
725 let a_key = SecretKey::from_slice(&[1; 32]).unwrap();
726 let b_key = SecretKey::from_slice(&[2; 32]).unwrap();
727 let b_pub = PublicKey::from_secret_key(&secp_ctx, &b_key);
729 let a_manager = Arc::new(PeerManager::new(MessageHandler {
730 chan_handler: Arc::new(lightning::ln::peer_handler::ErroringMessageHandler::new()),
731 onion_message_handler: Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{}),
732 route_handler: Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{}),
733 }, a_key, 0, &[1; 32], Arc::new(TestLogger()), Arc::new(lightning::ln::peer_handler::IgnoringMessageHandler{})));
735 // Make two connections, one for an inbound and one for an outbound connection
737 let (conn_a, _) = make_tcp_connection();
741 let (_, conn_b) = make_tcp_connection();
745 // Call connection setup inside new tokio tasks.
746 let manager_reference = Arc::clone(&a_manager);
747 tokio::spawn(async move {
748 super::setup_inbound(manager_reference, conn_a).await
750 tokio::spawn(async move {
751 super::setup_outbound(a_manager, b_pub, conn_b).await
755 #[tokio::test(flavor = "multi_thread")]
756 async fn threaded_race_disconnect_accept() {
757 race_disconnect_accept().await;
761 async fn unthreaded_race_disconnect_accept() {
762 race_disconnect_accept().await;