+async fn start_ldk() {
+ let args = match cli::parse_startup_args() {
+ Ok(user_args) => user_args,
+ Err(()) => return,
+ };
+
+ // Initialize the LDK data directory if necessary.
+ let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
+ fs::create_dir_all(ldk_data_dir.clone()).unwrap();
+
+ // Initialize our bitcoind client.
+ let bitcoind_client = match BitcoindClient::new(
+ args.bitcoind_rpc_host.clone(),
+ args.bitcoind_rpc_port,
+ args.bitcoind_rpc_username.clone(),
+ args.bitcoind_rpc_password.clone(),
+ )
+ .await
+ {
+ Ok(client) => Arc::new(client),
+ Err(e) => {
+ println!("Failed to connect to bitcoind client: {}", e);
+ return;
+ }
+ };
+
+ // ## Setup
+ // Step 1: Initialize the FeeEstimator
+
+ // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
+ let fee_estimator = bitcoind_client.clone();
+
+ // Step 2: Initialize the Logger
+ let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
+
+ // Step 3: Initialize the BroadcasterInterface
+
+ // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
+ // broadcaster.
+ let broadcaster = bitcoind_client.clone();
+
+ // Step 4: Initialize Persist
+ let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
+
+ // Step 5: Initialize the ChainMonitor
+ let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
+ None,
+ broadcaster.clone(),
+ logger.clone(),
+ fee_estimator.clone(),
+ persister.clone(),
+ ));
+
+ // Step 6: Initialize the KeysManager
+
+ // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
+ // other secret key material.
+ let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
+ let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
+ assert_eq!(seed.len(), 32);
+ let mut key = [0; 32];
+ key.copy_from_slice(&seed);
+ key
+ } else {
+ let mut key = [0; 32];
+ thread_rng().fill_bytes(&mut key);
+ match File::create(keys_seed_path.clone()) {
+ Ok(mut f) => {
+ f.write_all(&key).expect("Failed to write node keys seed to disk");
+ f.sync_all().expect("Failed to sync node keys seed to disk");
+ }
+ Err(e) => {
+ println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
+ return;
+ }
+ }
+ key
+ };
+ let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
+ let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
+
+ // Step 7: Read ChannelMonitor state from disk
+ let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
+
+ // Step 9: Initialize the ChannelManager
+ let user_config = UserConfig::default();
+ let mut restarting_node = true;
+ let (channel_manager_blockhash, mut channel_manager) = {
+ if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
+ let mut channel_monitor_mut_references = Vec::new();
+ for (_, channel_monitor) in channelmonitors.iter_mut() {
+ channel_monitor_mut_references.push(channel_monitor);
+ }
+ let read_args = ChannelManagerReadArgs::new(
+ keys_manager.clone(),
+ fee_estimator.clone(),
+ chain_monitor.clone(),
+ broadcaster.clone(),
+ logger.clone(),
+ user_config,
+ channel_monitor_mut_references,
+ );
+ <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
+ } 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,
+ latest_hash: getinfo_resp.latest_blockhash,
+ latest_height: getinfo_resp.latest_height,
+ };
+ let fresh_channel_manager = channelmanager::ChannelManager::new(
+ fee_estimator.clone(),
+ chain_monitor.clone(),
+ broadcaster.clone(),
+ logger.clone(),
+ keys_manager.clone(),
+ user_config,
+ chain_params,
+ );
+ (getinfo_resp.latest_blockhash, fresh_channel_manager)
+ }
+ };
+
+ // 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;
+ if restarting_node {
+ let mut chain_listeners =
+ vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
+
+ for (blockhash, channel_monitor) in channelmonitors.drain(..) {
+ let outpoint = channel_monitor.get_funding_txo().0;
+ chain_listener_channel_monitors.push((
+ blockhash,
+ (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
+ outpoint,
+ ));
+ }
+
+ for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
+ chain_listeners.push((
+ monitor_listener_info.0,
+ &mut monitor_listener_info.1 as &mut dyn chain::Listen,
+ ));
+ }
+ chain_tip = Some(
+ init::synchronize_listeners(
+ &mut bitcoind_client.deref(),
+ args.network,
+ &mut cache,
+ chain_listeners,
+ )
+ .await
+ .unwrap(),
+ );
+ }
+
+ // 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;
+ chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
+ }
+
+ // Step 13: Optional: Initialize the NetGraphMsgHandler
+ // XXX persist routing data
+ let genesis = genesis_block(args.network).header.block_hash();
+ let router =
+ Arc::new(NetGraphMsgHandler::new(genesis, None::<Arc<dyn chain::Access>>, logger.clone()));
+
+ // Step 14: Initialize the PeerManager
+ let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
+ let mut ephemeral_bytes = [0; 32];
+ rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
+ let lightning_msg_handler =
+ MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
+ let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
+ lightning_msg_handler,
+ keys_manager.get_node_secret(),
+ &ephemeral_bytes,
+ logger.clone(),
+ ));
+
+ // ## Running LDK
+ // Step 16: Initialize Peer Connection Handling
+
+ // We poll for events in handle_ldk_events(..) rather than waiting for them over the
+ // mpsc::channel, so we can leave the event receiver as unused.
+ let (event_ntfn_sender, _event_ntfn_receiver) = mpsc::channel(2);
+ let peer_manager_connection_handler = peer_manager.clone();
+ let event_notifier = event_ntfn_sender.clone();
+ let listening_port = args.ldk_peer_listening_port;
+ tokio::spawn(async move {
+ let listener = std::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port)).unwrap();
+ loop {
+ let tcp_stream = listener.accept().unwrap().0;
+ lightning_net_tokio::setup_inbound(
+ peer_manager_connection_handler.clone(),
+ event_notifier.clone(),
+ tcp_stream,
+ )
+ .await;
+ }
+ });
+
+ // Step 17: Connect and Disconnect Blocks
+ if chain_tip.is_none() {
+ chain_tip =
+ Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
+ }
+ let channel_manager_listener = channel_manager.clone();
+ let chain_monitor_listener = chain_monitor.clone();
+ let bitcoind_block_source = bitcoind_client.clone();
+ let network = args.network;
+ tokio::spawn(async move {
+ let mut derefed = bitcoind_block_source.deref();
+ let chain_poller = poll::ChainPoller::new(&mut derefed, network);
+ let chain_listener = (chain_monitor_listener, channel_manager_listener);
+ let mut spv_client =
+ SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
+ loop {
+ spv_client.poll_best_tip().await.unwrap();
+ tokio::time::sleep(Duration::from_secs(1)).await;
+ }
+ });
+
+ // Step 17 & 18: Initialize ChannelManager persistence & Once Per Minute: ChannelManager's
+ // timer_chan_freshness_every_min() and PeerManager's timer_tick_occurred
+ let data_dir = ldk_data_dir.clone();
+ let persist_channel_manager_callback =
+ move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
+ BackgroundProcessor::start(
+ persist_channel_manager_callback,
+ channel_manager.clone(),
+ peer_manager.clone(),
+ logger.clone(),
+ );
+
+ // Step 15: Initialize LDK Event Handling
+ let channel_manager_event_listener = channel_manager.clone();
+ let chain_monitor_event_listener = chain_monitor.clone();
+ let keys_manager_listener = keys_manager.clone();
+ // TODO: persist payment info to disk
+ let payment_info: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
+ let payment_info_for_events = payment_info.clone();
+ let network = args.network;
+ let bitcoind_rpc = bitcoind_client.clone();
+ tokio::spawn(async move {
+ handle_ldk_events(
+ channel_manager_event_listener,
+ chain_monitor_event_listener,
+ bitcoind_rpc,
+ keys_manager_listener,
+ payment_info_for_events,
+ network,
+ )
+ .await;
+ });
+
+ // Reconnect to channel peers if possible.
+ let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
+ match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
+ Ok(mut info) => {
+ for (pubkey, peer_addr) in info.drain() {
+ for chan_info in channel_manager.list_channels() {
+ if pubkey == chan_info.remote_network_id {
+ let _ = cli::connect_peer_if_necessary(
+ pubkey,
+ peer_addr,
+ peer_manager.clone(),
+ event_ntfn_sender.clone(),
+ );
+ }
+ }
+ }
+ }
+ Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
+ }
+
+ // Start the CLI.
+ cli::poll_for_user_input(
+ peer_manager.clone(),
+ channel_manager.clone(),
+ router.clone(),
+ payment_info,
+ keys_manager.get_node_secret(),
+ event_ntfn_sender,
+ ldk_data_dir.clone(),
+ logger.clone(),
+ args.network,
+ )
+ .await;