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Merge pull request lightningdevkit#266 from tnull/2024-03-introduce-c…
…onnection-manager Improve connection management
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,147 @@ | ||
| use crate::logger::{log_error, log_info, Logger}; | ||
| use crate::types::PeerManager; | ||
| use crate::Error; | ||
|
|
||
| use lightning::ln::msgs::SocketAddress; | ||
|
|
||
| use bitcoin::secp256k1::PublicKey; | ||
|
|
||
| use std::collections::hash_map::{self, HashMap}; | ||
| use std::net::ToSocketAddrs; | ||
| use std::ops::Deref; | ||
| use std::sync::{Arc, Mutex}; | ||
| use std::time::Duration; | ||
|
|
||
| pub(crate) struct ConnectionManager<L: Deref + Clone + Sync + Send> | ||
| where | ||
| L::Target: Logger, | ||
| { | ||
| pending_connections: | ||
| Mutex<HashMap<PublicKey, Vec<tokio::sync::oneshot::Sender<Result<(), Error>>>>>, | ||
| peer_manager: Arc<PeerManager>, | ||
| logger: L, | ||
| } | ||
|
|
||
| impl<L: Deref + Clone + Sync + Send> ConnectionManager<L> | ||
| where | ||
| L::Target: Logger, | ||
| { | ||
| pub(crate) fn new(peer_manager: Arc<PeerManager>, logger: L) -> Self { | ||
| let pending_connections = Mutex::new(HashMap::new()); | ||
| Self { pending_connections, peer_manager, logger } | ||
| } | ||
|
|
||
| pub(crate) async fn connect_peer_if_necessary( | ||
| &self, node_id: PublicKey, addr: SocketAddress, | ||
| ) -> Result<(), Error> { | ||
| if self.peer_manager.peer_by_node_id(&node_id).is_some() { | ||
| return Ok(()); | ||
| } | ||
|
|
||
| self.do_connect_peer(node_id, addr).await | ||
| } | ||
|
|
||
| pub(crate) async fn do_connect_peer( | ||
| &self, node_id: PublicKey, addr: SocketAddress, | ||
| ) -> Result<(), Error> { | ||
| // First, we check if there is already an outbound connection in flight, if so, we just | ||
| // await on the corresponding watch channel. The task driving the connection future will | ||
| // send us the result.. | ||
| let pending_ready_receiver_opt = self.register_or_subscribe_pending_connection(&node_id); | ||
| if let Some(pending_connection_ready_receiver) = pending_ready_receiver_opt { | ||
| return pending_connection_ready_receiver.await.map_err(|e| { | ||
| debug_assert!(false, "Failed to receive connection result: {:?}", e); | ||
| log_error!(self.logger, "Failed to receive connection result: {:?}", e); | ||
| Error::ConnectionFailed | ||
| })?; | ||
| } | ||
|
|
||
| log_info!(self.logger, "Connecting to peer: {}@{}", node_id, addr); | ||
|
|
||
| let socket_addr = addr | ||
| .to_socket_addrs() | ||
| .map_err(|e| { | ||
| log_error!(self.logger, "Failed to resolve network address {}: {}", addr, e); | ||
| self.propagate_result_to_subscribers(&node_id, Err(Error::InvalidSocketAddress)); | ||
| Error::InvalidSocketAddress | ||
| })? | ||
| .next() | ||
| .ok_or_else(|| { | ||
| log_error!(self.logger, "Failed to resolve network address {}", addr); | ||
| self.propagate_result_to_subscribers(&node_id, Err(Error::InvalidSocketAddress)); | ||
| Error::InvalidSocketAddress | ||
| })?; | ||
|
|
||
| let connection_future = lightning_net_tokio::connect_outbound( | ||
| Arc::clone(&self.peer_manager), | ||
| node_id, | ||
| socket_addr, | ||
| ); | ||
|
|
||
| let res = match connection_future.await { | ||
| Some(connection_closed_future) => { | ||
| let mut connection_closed_future = Box::pin(connection_closed_future); | ||
| loop { | ||
| tokio::select! { | ||
| _ = &mut connection_closed_future => { | ||
| log_info!(self.logger, "Peer connection closed: {}@{}", node_id, addr); | ||
| break Err(Error::ConnectionFailed); | ||
| }, | ||
| _ = tokio::time::sleep(Duration::from_millis(10)) => {}, | ||
| }; | ||
|
|
||
| match self.peer_manager.peer_by_node_id(&node_id) { | ||
| Some(_) => break Ok(()), | ||
| None => continue, | ||
| } | ||
| } | ||
| }, | ||
| None => { | ||
| log_error!(self.logger, "Failed to connect to peer: {}@{}", node_id, addr); | ||
| Err(Error::ConnectionFailed) | ||
| }, | ||
| }; | ||
|
|
||
| self.propagate_result_to_subscribers(&node_id, res); | ||
|
|
||
| res | ||
| } | ||
|
|
||
| fn register_or_subscribe_pending_connection( | ||
| &self, node_id: &PublicKey, | ||
| ) -> Option<tokio::sync::oneshot::Receiver<Result<(), Error>>> { | ||
| let mut pending_connections_lock = self.pending_connections.lock().unwrap(); | ||
| match pending_connections_lock.entry(*node_id) { | ||
| hash_map::Entry::Occupied(mut entry) => { | ||
| let (tx, rx) = tokio::sync::oneshot::channel(); | ||
| entry.get_mut().push(tx); | ||
| Some(rx) | ||
| }, | ||
| hash_map::Entry::Vacant(entry) => { | ||
| entry.insert(Vec::new()); | ||
| None | ||
| }, | ||
| } | ||
| } | ||
|
|
||
| fn propagate_result_to_subscribers(&self, node_id: &PublicKey, res: Result<(), Error>) { | ||
| // Send the result to any other tasks that might be waiting on it by now. | ||
| let mut pending_connections_lock = self.pending_connections.lock().unwrap(); | ||
| if let Some(connection_ready_senders) = pending_connections_lock.remove(node_id) { | ||
| for sender in connection_ready_senders { | ||
| let _ = sender.send(res).map_err(|e| { | ||
| debug_assert!( | ||
| false, | ||
| "Failed to send connection result to subscribers: {:?}", | ||
| e | ||
| ); | ||
| log_error!( | ||
| self.logger, | ||
| "Failed to send connection result to subscribers: {:?}", | ||
| e | ||
| ); | ||
| }); | ||
| } | ||
| } | ||
| } | ||
| } |
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