From: Matt Corallo <git@bluematt.me>
Date: Tue, 4 May 2021 20:02:27 +0000 (+0000)
Subject: Connect to peers with tokio TcpStreams isntead of blocking tokio
X-Git-Url: http://git.bitcoin.ninja/index.cgi?p=ldk-sample;a=commitdiff_plain;h=bb94f28a1faa695ff5f0f66c05811a7cb739c101

Connect to peers with tokio TcpStreams isntead of blocking tokio
---

diff --git a/Cargo.lock b/Cargo.lock
index 5bc89f3..07ff824 100644
--- a/Cargo.lock
+++ b/Cargo.lock
@@ -234,6 +234,7 @@ dependencies = [
  "bech32 0.7.2",
  "bitcoin",
  "bitcoin-bech32",
+ "futures",
  "hex",
  "lightning",
  "lightning-background-processor",
diff --git a/Cargo.toml b/Cargo.toml
index a51252e..1b3935d 100644
--- a/Cargo.toml
+++ b/Cargo.toml
@@ -21,6 +21,7 @@ bitcoin-bech32 = "0.7"
 bech32 = "0.7"
 hex = "0.3"
 
+futures = "0.3"
 time = "0.2"
 rand = "0.4"
 serde_json = { version = "1.0" }
diff --git a/src/cli.rs b/src/cli.rs
index 32119ae..04b18f9 100644
--- a/src/cli.rs
+++ b/src/cli.rs
@@ -18,7 +18,7 @@ use lightning_invoice::{utils, Currency, Invoice};
 use std::env;
 use std::io;
 use std::io::{BufRead, Write};
-use std::net::{SocketAddr, TcpStream};
+use std::net::SocketAddr;
 use std::ops::Deref;
 use std::path::Path;
 use std::str::FromStr;
@@ -151,6 +151,7 @@ pub(crate) async fn poll_for_user_input(
 						peer_manager.clone(),
 						event_notifier.clone(),
 					)
+					.await
 					.is_err()
 					{
 						print!("> ");
@@ -300,6 +301,7 @@ pub(crate) async fn poll_for_user_input(
 						peer_manager.clone(),
 						event_notifier.clone(),
 					)
+					.await
 					.is_ok()
 					{
 						println!("SUCCESS: connected to peer {}", pubkey);
@@ -452,7 +454,7 @@ fn list_payments(inbound_payments: PaymentInfoStorage, outbound_payments: Paymen
 	println!("]");
 }
 
-pub(crate) fn connect_peer_if_necessary(
+pub(crate) async fn connect_peer_if_necessary(
 	pubkey: PublicKey, peer_addr: SocketAddr, peer_manager: Arc<PeerManager>,
 	event_notifier: mpsc::Sender<()>,
 ) -> Result<(), ()> {
@@ -461,24 +463,29 @@ pub(crate) fn connect_peer_if_necessary(
 			return Ok(());
 		}
 	}
-	match TcpStream::connect_timeout(&peer_addr, Duration::from_secs(10)) {
-		Ok(stream) => {
-			let peer_mgr = peer_manager.clone();
-			let event_ntfns = event_notifier.clone();
-			tokio::spawn(async move {
-				lightning_net_tokio::setup_outbound(peer_mgr, event_ntfns, pubkey, stream).await;
-			});
+	match lightning_net_tokio::connect_outbound(Arc::clone(&peer_manager), event_notifier, pubkey, peer_addr).await {
+		Some(conn_closed_fut) => {
+			let mut closed_fut_box = Box::pin(conn_closed_fut);
 			let mut peer_connected = false;
 			while !peer_connected {
+				match futures::poll!(&mut closed_fut_box) {
+					std::task::Poll::Ready(_) => {
+						println!("ERROR: Peer disconnected before we finished the handshake");
+						return Err(());
+					},
+					std::task::Poll::Pending => {}
+				}
 				for node_pubkey in peer_manager.get_peer_node_ids() {
 					if node_pubkey == pubkey {
 						peer_connected = true;
 					}
 				}
+				// Avoid blocking the tokio context by sleeping a bit
+				tokio::time::sleep(Duration::from_millis(10)).await;
 			}
 		}
-		Err(e) => {
-			println!("ERROR: failed to connect to peer: {:?}", e);
+		None => {
+			println!("ERROR: failed to connect to peer");
 			return Err(());
 		}
 	}