_ Git - ldk-sample/blob - src/main.rs

   1 pub mod bitcoind_client;
   2 mod cli;
   3 mod convert;
   4 mod disk;
   5 mod hex_utils;
   6
   7 use crate::bitcoind_client::BitcoindClient;
   8 use crate::disk::FilesystemLogger;
   9 use bitcoin::blockdata::constants::genesis_block;
  10 use bitcoin::blockdata::transaction::Transaction;
  11 use bitcoin::consensus::encode;
  12 use bitcoin::hashes::sha256::Hash as Sha256;
  13 use bitcoin::hashes::Hash;
  14 use bitcoin::network::constants::Network;
  15 use bitcoin::secp256k1::Secp256k1;
  16 use bitcoin::BlockHash;
  17 use bitcoin_bech32::WitnessProgram;
  18 use lightning::chain;
  19 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  20 use lightning::chain::chainmonitor;
  21 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
  22 use lightning::chain::{BestBlock, Filter, Watch};
  23 use lightning::ln::channelmanager;
  24 use lightning::ln::channelmanager::{
  25         ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
  26 };
  27 use lightning::ln::peer_handler::{MessageHandler, SimpleArcPeerManager};
  28 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  29 use lightning::routing::network_graph::NetGraphMsgHandler;
  30 use lightning::util::config::UserConfig;
  31 use lightning::util::events::{Event, PaymentPurpose};
  32 use lightning::util::ser::ReadableArgs;
  33 use lightning_background_processor::BackgroundProcessor;
  34 use lightning_block_sync::init;
  35 use lightning_block_sync::poll;
  36 use lightning_block_sync::SpvClient;
  37 use lightning_block_sync::UnboundedCache;
  38 use lightning_net_tokio::SocketDescriptor;
  39 use lightning_persister::FilesystemPersister;
  40 use rand::{thread_rng, Rng};
  41 use std::collections::hash_map::Entry;
  42 use std::collections::HashMap;
  43 use std::fmt;
  44 use std::fs;
  45 use std::fs::File;
  46 use std::io;
  47 use std::io::Write;
  48 use std::ops::Deref;
  49 use std::path::Path;
  50 use std::sync::{Arc, Mutex};
  51 use std::time::{Duration, SystemTime};
  52
  53 pub(crate) enum HTLCStatus {
  54         Pending,
  55         Succeeded,
  56         Failed,
  57 }
  58
  59 pub(crate) struct MillisatAmount(Option<u64>);
  60
  61 impl fmt::Display for MillisatAmount {
  62         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  63                 match self.0 {
  64                         Some(amt) => write!(f, "{}", amt),
  65                         None => write!(f, "unknown"),
  66                 }
  67         }
  68 }
  69
  70 pub(crate) struct PaymentInfo {
  71         preimage: Option<PaymentPreimage>,
  72         secret: Option<PaymentSecret>,
  73         status: HTLCStatus,
  74         amt_msat: MillisatAmount,
  75 }
  76
  77 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
  78
  79 type ChainMonitor = chainmonitor::ChainMonitor<
  80         InMemorySigner,
  81         Arc<dyn Filter + Send + Sync>,
  82         Arc<BitcoindClient>,
  83         Arc<BitcoindClient>,
  84         Arc<FilesystemLogger>,
  85         Arc<FilesystemPersister>,
  86 >;
  87
  88 pub(crate) type PeerManager = SimpleArcPeerManager<
  89         SocketDescriptor,
  90         ChainMonitor,
  91         BitcoindClient,
  92         BitcoindClient,
  93         dyn chain::Access + Send + Sync,
  94         FilesystemLogger,
  95 >;
  96
  97 pub(crate) type ChannelManager =
  98         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
  99
 100 async fn handle_ldk_events(
 101         channel_manager: Arc<ChannelManager>, bitcoind_client: Arc<BitcoindClient>,
 102         keys_manager: Arc<KeysManager>, inbound_payments: PaymentInfoStorage,
 103         outbound_payments: PaymentInfoStorage, network: Network, event: Event,
 104 ) {
 105         match event {
 106                 Event::FundingGenerationReady {
 107                         temporary_channel_id,
 108                         channel_value_satoshis,
 109                         output_script,
 110                         ..
 111                 } => {
 112                         // Construct the raw transaction with one output, that is paid the amount of the
 113                         // channel.
 114                         let addr = WitnessProgram::from_scriptpubkey(
 115                                 &output_script[..],
 116                                 match network {
 117                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 118                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 119                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 120                                         Network::Signet => panic!("Signet unsupported"),
 121                                 },
 122                         )
 123                         .expect("Lightning funding tx should always be to a SegWit output")
 124                         .to_address();
 125                         let mut outputs = vec![HashMap::with_capacity(1)];
 126                         outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
 127                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 128
 129                         // Have your wallet put the inputs into the transaction such that the output is
 130                         // satisfied.
 131                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 132                         let change_output_position = funded_tx.changepos;
 133                         assert!(change_output_position == 0 || change_output_position == 1);
 134
 135                         // Sign the final funding transaction and broadcast it.
 136                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 137                         assert_eq!(signed_tx.complete, true);
 138                         let final_tx: Transaction =
 139                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 140                         // Give the funding transaction back to LDK for opening the channel.
 141                         if channel_manager
 142                                 .funding_transaction_generated(&temporary_channel_id, final_tx)
 143                                 .is_err()
 144                         {
 145                                 println!(
 146                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 147                                 print!("> ");
 148                                 io::stdout().flush().unwrap();
 149                         }
 150                 }
 151                 Event::PaymentReceived { payment_hash, purpose, amt, .. } => {
 152                         let mut payments = inbound_payments.lock().unwrap();
 153                         let (payment_preimage, payment_secret) = match purpose {
 154                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 155                                         (payment_preimage, Some(payment_secret))
 156                                 }
 157                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(preimage), None),
 158                         };
 159                         let status = match channel_manager.claim_funds(payment_preimage.unwrap()) {
 160                                 true => {
 161                                         println!(
 162                                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 163                                                 hex_utils::hex_str(&payment_hash.0),
 164                                                 amt
 165                                         );
 166                                         print!("> ");
 167                                         io::stdout().flush().unwrap();
 168                                         HTLCStatus::Succeeded
 169                                 }
 170                                 _ => HTLCStatus::Failed,
 171                         };
 172                         match payments.entry(payment_hash) {
 173                                 Entry::Occupied(mut e) => {
 174                                         let payment = e.get_mut();
 175                                         payment.status = status;
 176                                         payment.preimage = payment_preimage;
 177                                         payment.secret = payment_secret;
 178                                 }
 179                                 Entry::Vacant(e) => {
 180                                         e.insert(PaymentInfo {
 181                                                 preimage: payment_preimage,
 182                                                 secret: payment_secret,
 183                                                 status,
 184                                                 amt_msat: MillisatAmount(Some(amt)),
 185                                         });
 186                                 }
 187                         }
 188                 }
 189                 Event::PaymentSent { payment_preimage } => {
 190                         let hashed = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
 191                         let mut payments = outbound_payments.lock().unwrap();
 192                         for (payment_hash, payment) in payments.iter_mut() {
 193                                 if *payment_hash == hashed {
 194                                         payment.preimage = Some(payment_preimage);
 195                                         payment.status = HTLCStatus::Succeeded;
 196                                         println!(
 197                                                 "\nEVENT: successfully sent payment of {} millisatoshis from \
 198                                                                  payment hash {:?} with preimage {:?}",
 199                                                 payment.amt_msat,
 200                                                 hex_utils::hex_str(&payment_hash.0),
 201                                                 hex_utils::hex_str(&payment_preimage.0)
 202                                         );
 203                                         print!("> ");
 204                                         io::stdout().flush().unwrap();
 205                                 }
 206                         }
 207                 }
 208                 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
 209                         print!(
 210                                 "\nEVENT: Failed to send payment to payment hash {:?}: ",
 211                                 hex_utils::hex_str(&payment_hash.0)
 212                         );
 213                         if rejected_by_dest {
 214                                 println!("re-attempting the payment will not succeed");
 215                         } else {
 216                                 println!("payment may be retried");
 217                         }
 218                         print!("> ");
 219                         io::stdout().flush().unwrap();
 220
 221                         let mut payments = outbound_payments.lock().unwrap();
 222                         if payments.contains_key(&payment_hash) {
 223                                 let payment = payments.get_mut(&payment_hash).unwrap();
 224                                 payment.status = HTLCStatus::Failed;
 225                         }
 226                 }
 227                 Event::PendingHTLCsForwardable { time_forwardable } => {
 228                         let forwarding_channel_manager = channel_manager.clone();
 229                         tokio::spawn(async move {
 230                                 let min = time_forwardable.as_millis() as u64;
 231                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 232                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 233                                 forwarding_channel_manager.process_pending_htlc_forwards();
 234                         });
 235                 }
 236                 Event::SpendableOutputs { outputs } => {
 237                         let destination_address = bitcoind_client.get_new_address().await;
 238                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 239                         let tx_feerate =
 240                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 241                         let spending_tx = keys_manager
 242                                 .spend_spendable_outputs(
 243                                         output_descriptors,
 244                                         Vec::new(),
 245                                         destination_address.script_pubkey(),
 246                                         tx_feerate,
 247                                         &Secp256k1::new(),
 248                                 )
 249                                 .unwrap();
 250                         bitcoind_client.broadcast_transaction(&spending_tx);
 251                 }
 252         }
 253 }
 254
 255 async fn start_ldk() {
 256         let args = match cli::parse_startup_args() {
 257                 Ok(user_args) => user_args,
 258                 Err(()) => return,
 259         };
 260
 261         // Initialize the LDK data directory if necessary.
 262         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 263         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 264
 265         // Initialize our bitcoind client.
 266         let bitcoind_client = match BitcoindClient::new(
 267                 args.bitcoind_rpc_host.clone(),
 268                 args.bitcoind_rpc_port,
 269                 args.bitcoind_rpc_username.clone(),
 270                 args.bitcoind_rpc_password.clone(),
 271         )
 272         .await
 273         {
 274                 Ok(client) => Arc::new(client),
 275                 Err(e) => {
 276                         println!("Failed to connect to bitcoind client: {}", e);
 277                         return;
 278                 }
 279         };
 280
 281         // Check that the bitcoind we've connected to is running the network we expect
 282         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 283         if bitcoind_chain
 284                 != match args.network {
 285                         bitcoin::Network::Bitcoin => "main",
 286                         bitcoin::Network::Testnet => "test",
 287                         bitcoin::Network::Regtest => "regtest",
 288                         bitcoin::Network::Signet => "signet",
 289                 } {
 290                 println!(
 291                         "Chain argument ({}) didn't match bitcoind chain ({})",
 292                         args.network, bitcoind_chain
 293                 );
 294                 return;
 295         }
 296
 297         // ## Setup
 298         // Step 1: Initialize the FeeEstimator
 299
 300         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 301         let fee_estimator = bitcoind_client.clone();
 302
 303         // Step 2: Initialize the Logger
 304         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 305
 306         // Step 3: Initialize the BroadcasterInterface
 307
 308         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 309         // broadcaster.
 310         let broadcaster = bitcoind_client.clone();
 311
 312         // Step 4: Initialize Persist
 313         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 314
 315         // Step 5: Initialize the ChainMonitor
 316         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 317                 None,
 318                 broadcaster.clone(),
 319                 logger.clone(),
 320                 fee_estimator.clone(),
 321                 persister.clone(),
 322         ));
 323
 324         // Step 6: Initialize the KeysManager
 325
 326         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 327         // other secret key material.
 328         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 329         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 330                 assert_eq!(seed.len(), 32);
 331                 let mut key = [0; 32];
 332                 key.copy_from_slice(&seed);
 333                 key
 334         } else {
 335                 let mut key = [0; 32];
 336                 thread_rng().fill_bytes(&mut key);
 337                 match File::create(keys_seed_path.clone()) {
 338                         Ok(mut f) => {
 339                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 340                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 341                         }
 342                         Err(e) => {
 343                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 344                                 return;
 345                         }
 346                 }
 347                 key
 348         };
 349         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 350         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 351
 352         // Step 7: Read ChannelMonitor state from disk
 353         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 354
 355         // Step 8: Initialize the ChannelManager
 356         let mut user_config = UserConfig::default();
 357         user_config.peer_channel_config_limits.force_announced_channel_preference = false;
 358         let mut restarting_node = true;
 359         let (channel_manager_blockhash, mut channel_manager) = {
 360                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 361                         let mut channel_monitor_mut_references = Vec::new();
 362                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 363                                 channel_monitor_mut_references.push(channel_monitor);
 364                         }
 365                         let read_args = ChannelManagerReadArgs::new(
 366                                 keys_manager.clone(),
 367                                 fee_estimator.clone(),
 368                                 chain_monitor.clone(),
 369                                 broadcaster.clone(),
 370                                 logger.clone(),
 371                                 user_config,
 372                                 channel_monitor_mut_references,
 373                         );
 374                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 375                 } else {
 376                         // We're starting a fresh node.
 377                         restarting_node = false;
 378                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 379
 380                         let chain_params = ChainParameters {
 381                                 network: args.network,
 382                                 best_block: BestBlock::new(
 383                                         getinfo_resp.latest_blockhash,
 384                                         getinfo_resp.latest_height as u32,
 385                                 ),
 386                         };
 387                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 388                                 fee_estimator.clone(),
 389                                 chain_monitor.clone(),
 390                                 broadcaster.clone(),
 391                                 logger.clone(),
 392                                 keys_manager.clone(),
 393                                 user_config,
 394                                 chain_params,
 395                         );
 396                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 397                 }
 398         };
 399
 400         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 401         let mut chain_listener_channel_monitors = Vec::new();
 402         let mut cache = UnboundedCache::new();
 403         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 404         if restarting_node {
 405                 let mut chain_listeners =
 406                         vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
 407
 408                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 409                         let outpoint = channel_monitor.get_funding_txo().0;
 410                         chain_listener_channel_monitors.push((
 411                                 blockhash,
 412                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 413                                 outpoint,
 414                         ));
 415                 }
 416
 417                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 418                         chain_listeners.push((
 419                                 monitor_listener_info.0,
 420                                 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
 421                         ));
 422                 }
 423                 chain_tip = Some(
 424                         init::synchronize_listeners(
 425                                 &mut bitcoind_client.deref(),
 426                                 args.network,
 427                                 &mut cache,
 428                                 chain_listeners,
 429                         )
 430                         .await
 431                         .unwrap(),
 432                 );
 433         }
 434
 435         // Step 10: Give ChannelMonitors to ChainMonitor
 436         for item in chain_listener_channel_monitors.drain(..) {
 437                 let channel_monitor = item.1 .0;
 438                 let funding_outpoint = item.2;
 439                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 440         }
 441
 442         // Step 11: Optional: Initialize the NetGraphMsgHandler
 443         let genesis = genesis_block(args.network).header.block_hash();
 444         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 445         let network_graph = disk::read_network(Path::new(&network_graph_path), genesis);
 446         let router = Arc::new(NetGraphMsgHandler::from_net_graph(
 447                 None::<Arc<dyn chain::Access + Send + Sync>>,
 448                 logger.clone(),
 449                 network_graph,
 450         ));
 451         let router_persist = Arc::clone(&router);
 452         tokio::spawn(async move {
 453                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 454                 loop {
 455                         interval.tick().await;
 456                         if disk::persist_network(
 457                                 Path::new(&network_graph_path),
 458                                 &*router_persist.network_graph.read().unwrap(),
 459                         )
 460                         .is_err()
 461                         {
 462                                 // Persistence errors here are non-fatal as we can just fetch the routing graph
 463                                 // again later, but they may indicate a disk error which could be fatal elsewhere.
 464                                 eprintln!(
 465                                         "Warning: Failed to persist network graph, check your disk and permissions"
 466                                 );
 467                         }
 468                 }
 469         });
 470
 471         // Step 12: Initialize the PeerManager
 472         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 473         let mut ephemeral_bytes = [0; 32];
 474         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 475         let lightning_msg_handler =
 476                 MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
 477         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 478                 lightning_msg_handler,
 479                 keys_manager.get_node_secret(),
 480                 &ephemeral_bytes,
 481                 logger.clone(),
 482         ));
 483
 484         // ## Running LDK
 485         // Step 13: Initialize networking
 486
 487         let peer_manager_connection_handler = peer_manager.clone();
 488         let listening_port = args.ldk_peer_listening_port;
 489         tokio::spawn(async move {
 490                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 491                         .await
 492                         .expect("Failed to bind to listen port - is something else already listening on it?");
 493                 loop {
 494                         let peer_mgr = peer_manager_connection_handler.clone();
 495                         let tcp_stream = listener.accept().await.unwrap().0;
 496                         tokio::spawn(async move {
 497                                 lightning_net_tokio::setup_inbound(
 498                                         peer_mgr.clone(),
 499                                         tcp_stream.into_std().unwrap(),
 500                                 )
 501                                 .await;
 502                         });
 503                 }
 504         });
 505
 506         // Step 14: Connect and Disconnect Blocks
 507         if chain_tip.is_none() {
 508                 chain_tip =
 509                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 510         }
 511         let channel_manager_listener = channel_manager.clone();
 512         let chain_monitor_listener = chain_monitor.clone();
 513         let bitcoind_block_source = bitcoind_client.clone();
 514         let network = args.network;
 515         tokio::spawn(async move {
 516                 let mut derefed = bitcoind_block_source.deref();
 517                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 518                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 519                 let mut spv_client =
 520                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 521                 loop {
 522                         spv_client.poll_best_tip().await.unwrap();
 523                         tokio::time::sleep(Duration::from_secs(1)).await;
 524                 }
 525         });
 526
 527         // Step 15: Handle LDK Events
 528         let channel_manager_event_listener = channel_manager.clone();
 529         let keys_manager_listener = keys_manager.clone();
 530         // TODO: persist payment info to disk
 531         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 532         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 533         let inbound_pmts_for_events = inbound_payments.clone();
 534         let outbound_pmts_for_events = outbound_payments.clone();
 535         let network = args.network;
 536         let bitcoind_rpc = bitcoind_client.clone();
 537         let handle = tokio::runtime::Handle::current();
 538         let event_handler = move |event| {
 539                 handle.block_on(handle_ldk_events(
 540                         channel_manager_event_listener.clone(),
 541                         bitcoind_rpc.clone(),
 542                         keys_manager_listener.clone(),
 543                         inbound_pmts_for_events.clone(),
 544                         outbound_pmts_for_events.clone(),
 545                         network,
 546                         event,
 547                 ))
 548         };
 549         // Step 16: Persist ChannelManager
 550         let data_dir = ldk_data_dir.clone();
 551         let persist_channel_manager_callback =
 552                 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
 553         // Step 17: Background Processing
 554         BackgroundProcessor::start(
 555                 persist_channel_manager_callback,
 556                 event_handler,
 557                 chain_monitor.clone(),
 558                 channel_manager.clone(),
 559                 peer_manager.clone(),
 560                 logger.clone(),
 561         );
 562
 563         // Reconnect to channel peers if possible.
 564         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 565         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 566                 Ok(mut info) => {
 567                         for (pubkey, peer_addr) in info.drain() {
 568                                 for chan_info in channel_manager.list_channels() {
 569                                         if pubkey == chan_info.counterparty.node_id {
 570                                                 let _ =
 571                                                         cli::connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone())
 572                                                                 .await;
 573                                         }
 574                                 }
 575                         }
 576                 }
 577                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 578         }
 579
 580         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 581         // some public channels, and is only useful if we have public listen address(es) to announce.
 582         // In a production environment, this should occur only after the announcement of new channels
 583         // to avoid churn in the global network graph.
 584         let chan_manager = Arc::clone(&channel_manager);
 585         let network = args.network;
 586         if !args.ldk_announced_listen_addr.is_empty() {
 587                 tokio::spawn(async move {
 588                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 589                         loop {
 590                                 interval.tick().await;
 591                                 chan_manager.broadcast_node_announcement(
 592                                         [0; 3],
 593                                         args.ldk_announced_node_name,
 594                                         args.ldk_announced_listen_addr.clone(),
 595                                 );
 596                         }
 597                 });
 598         }
 599
 600         // Start the CLI.
 601         cli::poll_for_user_input(
 602                 peer_manager.clone(),
 603                 channel_manager.clone(),
 604                 keys_manager.clone(),
 605                 router.clone(),
 606                 inbound_payments,
 607                 outbound_payments,
 608                 ldk_data_dir.clone(),
 609                 logger.clone(),
 610                 network,
 611         )
 612         .await;
 613 }
 614
 615 #[tokio::main]
 616 pub async fn main() {
 617         start_ldk().await;
 618 }