Fix channel manager race panic

[ldk-sample] / src / main.rs

diff --git a/src/main.rs b/src/main.rs
index 4314ac87131dc05ee92f56b51ebfc36e5f3336f2..edb9ab2d501a9ade89d63322c9258bdfe4040b2c 100644 (file)
--- a/src/main.rs
+++ b/src/main.rs
@@ -17,7 +17,7 @@ use lightning::chain;
 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager, Recipient};
 use lightning::chain::{chainmonitor, ChannelMonitorUpdateStatus};
-use lightning::chain::{BestBlock, Filter, Watch};
+use lightning::chain::{Filter, Watch};
 use lightning::ln::channelmanager;
 use lightning::ln::channelmanager::{
        ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
@@ -458,7 +458,12 @@ async fn start_ldk() {
        // Step 7: Read ChannelMonitor state from disk
        let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 
-       // Step 8: Initialize the ChannelManager
+       // Step 8: Poll for the best chain tip, which may be used by the channel manager & spv client
+       let polled_chain_tip = init::validate_best_block_header(bitcoind_client.as_ref())
+               .await
+               .expect("Failed to fetch best block header and best block");
+
+       // Step 9: Initialize the ChannelManager
        let mut user_config = UserConfig::default();
        user_config.channel_handshake_limits.force_announced_channel_preference = false;
        let mut restarting_node = true;
@@ -481,15 +486,11 @@ async fn start_ldk() {
                } else {
                        // We're starting a fresh node.
                        restarting_node = false;
-                       let getinfo_resp = bitcoind_client.get_blockchain_info().await;
-
-                       let chain_params = ChainParameters {
-                               network: args.network,
-                               best_block: BestBlock::new(
-                                       getinfo_resp.latest_blockhash,
-                                       getinfo_resp.latest_height as u32,
-                               ),
-                       };
+
+                       let polled_best_block = polled_chain_tip.to_best_block();
+                       let polled_best_block_hash = polled_best_block.block_hash();
+                       let chain_params =
+                               ChainParameters { network: args.network, best_block: polled_best_block };
                        let fresh_channel_manager = channelmanager::ChannelManager::new(
                                fee_estimator.clone(),
                                chain_monitor.clone(),
@@ -499,11 +500,11 @@ async fn start_ldk() {
                                user_config,
                                chain_params,
                        );
-                       (getinfo_resp.latest_blockhash, fresh_channel_manager)
+                       (polled_best_block_hash, fresh_channel_manager)
                }
        };
 
-       // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
+       // Step 10: Sync ChannelMonitors and ChannelManager to chain tip
        let mut chain_listener_channel_monitors = Vec::new();
        let mut cache = UnboundedCache::new();
        let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
@@ -540,7 +541,7 @@ async fn start_ldk() {
                );
        }
 
-       // Step 10: Give ChannelMonitors to ChainMonitor
+       // Step 11: Give ChannelMonitors to ChainMonitor
        for item in chain_listener_channel_monitors.drain(..) {
                let channel_monitor = item.1 .0;
                let funding_outpoint = item.2;
@@ -550,7 +551,7 @@ async fn start_ldk() {
                );
        }
 
-       // Step 11: Optional: Initialize the P2PGossipSync
+       // Step 12: Optional: Initialize the P2PGossipSync
        let genesis = genesis_block(args.network).header.block_hash();
        let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
        let network_graph =
@@ -561,7 +562,7 @@ async fn start_ldk() {
                logger.clone(),
        ));
 
-       // Step 12: Initialize the PeerManager
+       // Step 13: Initialize the PeerManager
        let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
        let onion_messenger: Arc<OnionMessenger> = Arc::new(OnionMessenger::new(
                Arc::clone(&keys_manager),
@@ -586,7 +587,7 @@ async fn start_ldk() {
        ));
 
        // ## Running LDK
-       // Step 13: Initialize networking
+       // Step 14: Initialize networking
 
        let peer_manager_connection_handler = peer_manager.clone();
        let listening_port = args.ldk_peer_listening_port;
@@ -612,9 +613,9 @@ async fn start_ldk() {
                }
        });
 
-       // Step 14: Connect and Disconnect Blocks
+       // Step 15: Connect and Disconnect Blocks
        if chain_tip.is_none() {
-               chain_tip = Some(init::validate_best_block_header(bitcoind_client.as_ref()).await.unwrap());
+               chain_tip = Some(polled_chain_tip);
        }
        let channel_manager_listener = channel_manager.clone();
        let chain_monitor_listener = chain_monitor.clone();
@@ -631,7 +632,7 @@ async fn start_ldk() {
                }
        });
 
-       // Step 15: Handle LDK Events
+       // Step 16: Handle LDK Events
        let channel_manager_event_listener = channel_manager.clone();
        let keys_manager_listener = keys_manager.clone();
        // TODO: persist payment info to disk
@@ -656,7 +657,7 @@ async fn start_ldk() {
                ));
        };
 
-       // Step 16: Initialize routing ProbabilisticScorer
+       // Step 17: Initialize routing ProbabilisticScorer
        let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
        let scorer = Arc::new(Mutex::new(disk::read_scorer(
                Path::new(&scorer_path),
@@ -664,7 +665,7 @@ async fn start_ldk() {
                Arc::clone(&logger),
        )));
 
-       // Step 17: Create InvoicePayer
+       // Step 18: Create InvoicePayer
        let router = DefaultRouter::new(
                network_graph.clone(),
                logger.clone(),
@@ -679,10 +680,10 @@ async fn start_ldk() {
                payment::Retry::Timeout(Duration::from_secs(10)),
        ));
 
-       // Step 18: Persist ChannelManager and NetworkGraph
+       // Step 19: Persist ChannelManager and NetworkGraph
        let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 
-       // Step 19: Background Processing
+       // Step 20: Background Processing
        let background_processor = BackgroundProcessor::start(
                persister,
                invoice_payer.clone(),