1 use std::collections::hash_map::RandomState;
2 use std::hash::{BuildHasher, Hasher};
3 use std::net::SocketAddr;
6 use std::time::{Duration, Instant};
8 use bitcoin::hashes::hex::ToHex;
9 use bitcoin::secp256k1::PublicKey;
10 use lightning::ln::peer_handler::{
11 ErroringMessageHandler, IgnoringMessageHandler, MessageHandler, PeerManager,
13 use lightning::{log_info, log_warn};
14 use lightning::routing::gossip::NetworkGraph;
15 use lightning::sign::KeysManager;
16 use lightning::util::logger::Logger;
17 use tokio::sync::mpsc;
18 use tokio::task::JoinSet;
21 use crate::downloader::GossipRouter;
22 use crate::types::{GossipMessage, GossipPeerManager};
24 pub(crate) async fn download_gossip<L: Deref + Clone + Send + Sync + 'static>(persistence_sender: mpsc::Sender<GossipMessage>,
25 completion_sender: mpsc::Sender<()>,
26 network_graph: Arc<NetworkGraph<L>>,
28 ) where L::Target: Logger {
29 let mut key = [42; 32];
30 let mut random_data = [43; 32];
31 // Get something psuedo-random from std.
32 let mut key_hasher = RandomState::new().build_hasher();
33 key_hasher.write_u8(1);
34 key[0..8].copy_from_slice(&key_hasher.finish().to_ne_bytes());
35 let mut rand_hasher = RandomState::new().build_hasher();
36 rand_hasher.write_u8(2);
37 random_data[0..8].copy_from_slice(&rand_hasher.finish().to_ne_bytes());
39 let keys_manager = Arc::new(KeysManager::new(&key, 0xdeadbeef, 0xdeadbeef));
41 let router = Arc::new(GossipRouter::new(network_graph, persistence_sender.clone(), logger.clone()));
43 let message_handler = MessageHandler {
44 chan_handler: ErroringMessageHandler::new(),
45 route_handler: Arc::clone(&router),
46 onion_message_handler: IgnoringMessageHandler {},
47 custom_message_handler: IgnoringMessageHandler {},
49 let peer_handler = Arc::new(PeerManager::new(
56 router.set_pm(Arc::clone(&peer_handler));
58 let ph_timer = Arc::clone(&peer_handler);
59 tokio::spawn(async move {
60 let mut intvl = tokio::time::interval(Duration::from_secs(10));
63 ph_timer.timer_tick_occurred();
67 log_info!(logger, "Connecting to Lightning peers...");
68 let peers = config::ln_peers();
69 let mut handles = JoinSet::new();
70 let mut connected_peer_count = 0;
72 if peers.len() <= config::CONNECTED_PEER_ASSERTION_LIMIT {
73 log_warn!(logger, "Peer assertion threshold is {}, but only {} peers specified.", config::CONNECTED_PEER_ASSERTION_LIMIT, peers.len());
76 for current_peer in peers {
77 let peer_handler_clone = peer_handler.clone();
78 let logger_clone = logger.clone();
79 handles.spawn(async move {
80 connect_peer(current_peer, peer_handler_clone, logger_clone).await
84 while let Some(connection_result) = handles.join_next().await {
85 if let Ok(connection) = connection_result {
87 connected_peer_count += 1;
88 if connected_peer_count >= config::CONNECTED_PEER_ASSERTION_LIMIT {
95 if connected_peer_count < 1 {
96 panic!("Failed to connect to any peer.");
99 log_info!(logger, "Connected to {} Lightning peers!", connected_peer_count);
101 let mut previous_announcement_count = 0u64;
102 let mut previous_update_count = 0u64;
103 let mut is_caught_up_with_gossip = false;
106 let mut latest_new_gossip_time = Instant::now();
107 let mut needs_to_notify_persister = false;
110 i += 1; // count the background activity
111 let sleep = tokio::time::sleep(Duration::from_secs(5));
115 let counter = router.counter.read().unwrap();
116 let total_message_count = counter.channel_announcements + counter.channel_updates;
117 let new_message_count = total_message_count - previous_announcement_count - previous_update_count;
119 let was_previously_caught_up_with_gossip = is_caught_up_with_gossip;
120 // TODO: make new message threshold (20) adjust based on connected peer count
121 is_caught_up_with_gossip = new_message_count < 20 && previous_announcement_count > 0 && previous_update_count > 0;
122 if new_message_count > 0 {
123 latest_new_gossip_time = Instant::now();
126 // if we either aren't caught up, or just stopped/started being caught up
127 if !is_caught_up_with_gossip || (is_caught_up_with_gossip != was_previously_caught_up_with_gossip) {
130 "gossip count (iteration {}): {} (delta: {}):\n\tannouncements: {}\n\t\tmismatched scripts: {}\n\tupdates: {}\n\t\tno HTLC max: {}\n",
134 counter.channel_announcements,
135 counter.channel_announcements_with_mismatched_scripts,
136 counter.channel_updates,
137 counter.channel_updates_without_htlc_max_msats
140 log_info!(logger, "Monitoring for gossip…")
143 if is_caught_up_with_gossip && !was_previously_caught_up_with_gossip {
144 log_info!(logger, "caught up with gossip!");
145 needs_to_notify_persister = true;
146 } else if !is_caught_up_with_gossip && was_previously_caught_up_with_gossip {
147 log_info!(logger, "Received new messages since catching up with gossip!");
150 let continuous_caught_up_duration = latest_new_gossip_time.elapsed();
151 if continuous_caught_up_duration.as_secs() > 600 {
152 log_warn!(logger, "No new gossip messages in 10 minutes! Something's amiss!");
155 previous_announcement_count = counter.channel_announcements;
156 previous_update_count = counter.channel_updates;
159 if needs_to_notify_persister {
160 needs_to_notify_persister = false;
161 completion_sender.send(()).await.unwrap();
166 async fn connect_peer<L: Deref + Clone + Send + Sync + 'static>(current_peer: (PublicKey, SocketAddr), peer_manager: GossipPeerManager<L>, logger: L) -> bool where L::Target: Logger {
167 // we seek to find out if the first connection attempt was successful
168 let (sender, mut receiver) = mpsc::channel::<bool>(1);
169 tokio::spawn(async move {
170 log_info!(logger, "Connecting to peer {}@{}...", current_peer.0.to_hex(), current_peer.1.to_string());
171 let mut is_first_iteration = true;
173 if let Some(disconnection_future) = lightning_net_tokio::connect_outbound(
174 Arc::clone(&peer_manager),
178 log_info!(logger, "Connected to peer {}@{}!", current_peer.0.to_hex(), current_peer.1.to_string());
179 if is_first_iteration {
180 sender.send(true).await.unwrap();
182 disconnection_future.await;
183 log_warn!(logger, "Disconnected from peer {}@{}", current_peer.0.to_hex(), current_peer.1.to_string());
185 log_warn!(logger, "Failed to connect to peer {}@{}!", current_peer.0.to_hex(), current_peer.1.to_string());
186 if is_first_iteration {
187 sender.send(false).await.unwrap();
190 is_first_iteration = false;
191 tokio::time::sleep(Duration::from_secs(10)).await;
192 log_warn!(logger, "Reconnecting to peer {}@{}...", current_peer.0.to_hex(), current_peer.1.to_string());
196 let success = receiver.recv().await.unwrap();