_ 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;
  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                         channel_manager.funding_transaction_generated(&temporary_channel_id, final_tx).unwrap();
 142                 }
 143                 Event::PaymentReceived { payment_hash, payment_preimage, payment_secret, amt, .. } => {
 144                         let mut payments = inbound_payments.lock().unwrap();
 145                         let status = match channel_manager.claim_funds(payment_preimage.unwrap()) {
 146                                 true => {
 147                                         println!(
 148                                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 149                                                 hex_utils::hex_str(&payment_hash.0),
 150                                                 amt
 151                                         );
 152                                         print!("> ");
 153                                         io::stdout().flush().unwrap();
 154                                         HTLCStatus::Succeeded
 155                                 }
 156                                 _ => HTLCStatus::Failed,
 157                         };
 158                         match payments.entry(payment_hash) {
 159                                 Entry::Occupied(mut e) => {
 160                                         let payment = e.get_mut();
 161                                         payment.status = status;
 162                                         payment.preimage = Some(payment_preimage.unwrap());
 163                                         payment.secret = Some(payment_secret);
 164                                 }
 165                                 Entry::Vacant(e) => {
 166                                         e.insert(PaymentInfo {
 167                                                 preimage: Some(payment_preimage.unwrap()),
 168                                                 secret: Some(payment_secret),
 169                                                 status,
 170                                                 amt_msat: MillisatAmount(Some(amt)),
 171                                         });
 172                                 }
 173                         }
 174                 }
 175                 Event::PaymentSent { payment_preimage } => {
 176                         let hashed = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
 177                         let mut payments = outbound_payments.lock().unwrap();
 178                         for (payment_hash, payment) in payments.iter_mut() {
 179                                 if *payment_hash == hashed {
 180                                         payment.preimage = Some(payment_preimage);
 181                                         payment.status = HTLCStatus::Succeeded;
 182                                         println!(
 183                                                 "\nEVENT: successfully sent payment of {} millisatoshis from \
 184                                                                  payment hash {:?} with preimage {:?}",
 185                                                 payment.amt_msat,
 186                                                 hex_utils::hex_str(&payment_hash.0),
 187                                                 hex_utils::hex_str(&payment_preimage.0)
 188                                         );
 189                                         print!("> ");
 190                                         io::stdout().flush().unwrap();
 191                                 }
 192                         }
 193                 }
 194                 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
 195                         print!(
 196                                 "\nEVENT: Failed to send payment to payment hash {:?}: ",
 197                                 hex_utils::hex_str(&payment_hash.0)
 198                         );
 199                         if rejected_by_dest {
 200                                 println!("re-attempting the payment will not succeed");
 201                         } else {
 202                                 println!("payment may be retried");
 203                         }
 204                         print!("> ");
 205                         io::stdout().flush().unwrap();
 206
 207                         let mut payments = outbound_payments.lock().unwrap();
 208                         if payments.contains_key(&payment_hash) {
 209                                 let payment = payments.get_mut(&payment_hash).unwrap();
 210                                 payment.status = HTLCStatus::Failed;
 211                         }
 212                 }
 213                 Event::PendingHTLCsForwardable { time_forwardable } => {
 214                         let forwarding_channel_manager = channel_manager.clone();
 215                         tokio::spawn(async move {
 216                                 let min = time_forwardable.as_millis() as u64;
 217                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 218                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 219                                 forwarding_channel_manager.process_pending_htlc_forwards();
 220                         });
 221                 }
 222                 Event::SpendableOutputs { outputs } => {
 223                         let destination_address = bitcoind_client.get_new_address().await;
 224                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 225                         let tx_feerate =
 226                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 227                         let spending_tx = keys_manager
 228                                 .spend_spendable_outputs(
 229                                         output_descriptors,
 230                                         Vec::new(),
 231                                         destination_address.script_pubkey(),
 232                                         tx_feerate,
 233                                         &Secp256k1::new(),
 234                                 )
 235                                 .unwrap();
 236                         bitcoind_client.broadcast_transaction(&spending_tx);
 237                 }
 238         }
 239 }
 240
 241 async fn start_ldk() {
 242         let args = match cli::parse_startup_args() {
 243                 Ok(user_args) => user_args,
 244                 Err(()) => return,
 245         };
 246
 247         // Initialize the LDK data directory if necessary.
 248         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 249         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 250
 251         // Initialize our bitcoind client.
 252         let bitcoind_client = match BitcoindClient::new(
 253                 args.bitcoind_rpc_host.clone(),
 254                 args.bitcoind_rpc_port,
 255                 args.bitcoind_rpc_username.clone(),
 256                 args.bitcoind_rpc_password.clone(),
 257         )
 258         .await
 259         {
 260                 Ok(client) => Arc::new(client),
 261                 Err(e) => {
 262                         println!("Failed to connect to bitcoind client: {}", e);
 263                         return;
 264                 }
 265         };
 266
 267         // Check that the bitcoind we've connected to is running the network we expect
 268         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 269         if bitcoind_chain
 270                 != match args.network {
 271                         bitcoin::Network::Bitcoin => "main",
 272                         bitcoin::Network::Testnet => "test",
 273                         bitcoin::Network::Regtest => "regtest",
 274                         bitcoin::Network::Signet => "signet",
 275                 } {
 276                 println!(
 277                         "Chain argument ({}) didn't match bitcoind chain ({})",
 278                         args.network, bitcoind_chain
 279                 );
 280                 return;
 281         }
 282
 283         // ## Setup
 284         // Step 1: Initialize the FeeEstimator
 285
 286         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 287         let fee_estimator = bitcoind_client.clone();
 288
 289         // Step 2: Initialize the Logger
 290         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 291
 292         // Step 3: Initialize the BroadcasterInterface
 293
 294         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 295         // broadcaster.
 296         let broadcaster = bitcoind_client.clone();
 297
 298         // Step 4: Initialize Persist
 299         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 300
 301         // Step 5: Initialize the ChainMonitor
 302         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 303                 None,
 304                 broadcaster.clone(),
 305                 logger.clone(),
 306                 fee_estimator.clone(),
 307                 persister.clone(),
 308         ));
 309
 310         // Step 6: Initialize the KeysManager
 311
 312         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 313         // other secret key material.
 314         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 315         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 316                 assert_eq!(seed.len(), 32);
 317                 let mut key = [0; 32];
 318                 key.copy_from_slice(&seed);
 319                 key
 320         } else {
 321                 let mut key = [0; 32];
 322                 thread_rng().fill_bytes(&mut key);
 323                 match File::create(keys_seed_path.clone()) {
 324                         Ok(mut f) => {
 325                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 326                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 327                         }
 328                         Err(e) => {
 329                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 330                                 return;
 331                         }
 332                 }
 333                 key
 334         };
 335         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 336         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 337
 338         // Step 7: Read ChannelMonitor state from disk
 339         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 340
 341         // Step 8: Initialize the ChannelManager
 342         let user_config = UserConfig::default();
 343         let mut restarting_node = true;
 344         let (channel_manager_blockhash, mut channel_manager) = {
 345                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 346                         let mut channel_monitor_mut_references = Vec::new();
 347                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 348                                 channel_monitor_mut_references.push(channel_monitor);
 349                         }
 350                         let read_args = ChannelManagerReadArgs::new(
 351                                 keys_manager.clone(),
 352                                 fee_estimator.clone(),
 353                                 chain_monitor.clone(),
 354                                 broadcaster.clone(),
 355                                 logger.clone(),
 356                                 user_config,
 357                                 channel_monitor_mut_references,
 358                         );
 359                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 360                 } else {
 361                         // We're starting a fresh node.
 362                         restarting_node = false;
 363                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 364
 365                         let chain_params = ChainParameters {
 366                                 network: args.network,
 367                                 best_block: BestBlock::new(
 368                                         getinfo_resp.latest_blockhash,
 369                                         getinfo_resp.latest_height as u32,
 370                                 ),
 371                         };
 372                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 373                                 fee_estimator.clone(),
 374                                 chain_monitor.clone(),
 375                                 broadcaster.clone(),
 376                                 logger.clone(),
 377                                 keys_manager.clone(),
 378                                 user_config,
 379                                 chain_params,
 380                         );
 381                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 382                 }
 383         };
 384
 385         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 386         let mut chain_listener_channel_monitors = Vec::new();
 387         let mut cache = UnboundedCache::new();
 388         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 389         if restarting_node {
 390                 let mut chain_listeners =
 391                         vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
 392
 393                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 394                         let outpoint = channel_monitor.get_funding_txo().0;
 395                         chain_listener_channel_monitors.push((
 396                                 blockhash,
 397                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 398                                 outpoint,
 399                         ));
 400                 }
 401
 402                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 403                         chain_listeners.push((
 404                                 monitor_listener_info.0,
 405                                 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
 406                         ));
 407                 }
 408                 chain_tip = Some(
 409                         init::synchronize_listeners(
 410                                 &mut bitcoind_client.deref(),
 411                                 args.network,
 412                                 &mut cache,
 413                                 chain_listeners,
 414                         )
 415                         .await
 416                         .unwrap(),
 417                 );
 418         }
 419
 420         // Step 10: Give ChannelMonitors to ChainMonitor
 421         for item in chain_listener_channel_monitors.drain(..) {
 422                 let channel_monitor = item.1 .0;
 423                 let funding_outpoint = item.2;
 424                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 425         }
 426
 427         // Step 11: Optional: Initialize the NetGraphMsgHandler
 428         let genesis = genesis_block(args.network).header.block_hash();
 429         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 430         let network_graph = disk::read_network(Path::new(&network_graph_path), genesis);
 431         let router = Arc::new(NetGraphMsgHandler::from_net_graph(
 432                 None::<Arc<dyn chain::Access + Send + Sync>>,
 433                 logger.clone(),
 434                 network_graph,
 435         ));
 436         let router_persist = Arc::clone(&router);
 437         tokio::spawn(async move {
 438                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 439                 loop {
 440                         interval.tick().await;
 441                         if disk::persist_network(
 442                                 Path::new(&network_graph_path),
 443                                 &*router_persist.network_graph.read().unwrap(),
 444                         )
 445                         .is_err()
 446                         {
 447                                 // Persistence errors here are non-fatal as we can just fetch the routing graph
 448                                 // again later, but they may indicate a disk error which could be fatal elsewhere.
 449                                 eprintln!(
 450                                         "Warning: Failed to persist network graph, check your disk and permissions"
 451                                 );
 452                         }
 453                 }
 454         });
 455
 456         // Step 12: Initialize the PeerManager
 457         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 458         let mut ephemeral_bytes = [0; 32];
 459         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 460         let lightning_msg_handler =
 461                 MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
 462         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 463                 lightning_msg_handler,
 464                 keys_manager.get_node_secret(),
 465                 &ephemeral_bytes,
 466                 logger.clone(),
 467         ));
 468
 469         // ## Running LDK
 470         // Step 13: Initialize networking
 471
 472         let peer_manager_connection_handler = peer_manager.clone();
 473         let listening_port = args.ldk_peer_listening_port;
 474         tokio::spawn(async move {
 475                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 476                         .await
 477                         .expect("Failed to bind to listen port - is something else already listening on it?");
 478                 loop {
 479                         let peer_mgr = peer_manager_connection_handler.clone();
 480                         let tcp_stream = listener.accept().await.unwrap().0;
 481                         tokio::spawn(async move {
 482                                 lightning_net_tokio::setup_inbound(
 483                                         peer_mgr.clone(),
 484                                         tcp_stream.into_std().unwrap(),
 485                                 )
 486                                 .await;
 487                         });
 488                 }
 489         });
 490
 491         // Step 14: Connect and Disconnect Blocks
 492         if chain_tip.is_none() {
 493                 chain_tip =
 494                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 495         }
 496         let channel_manager_listener = channel_manager.clone();
 497         let chain_monitor_listener = chain_monitor.clone();
 498         let bitcoind_block_source = bitcoind_client.clone();
 499         let network = args.network;
 500         tokio::spawn(async move {
 501                 let mut derefed = bitcoind_block_source.deref();
 502                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 503                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 504                 let mut spv_client =
 505                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 506                 loop {
 507                         spv_client.poll_best_tip().await.unwrap();
 508                         tokio::time::sleep(Duration::from_secs(1)).await;
 509                 }
 510         });
 511
 512         // Step 15: Handle LDK Events
 513         let channel_manager_event_listener = channel_manager.clone();
 514         let keys_manager_listener = keys_manager.clone();
 515         // TODO: persist payment info to disk
 516         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 517         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 518         let inbound_pmts_for_events = inbound_payments.clone();
 519         let outbound_pmts_for_events = outbound_payments.clone();
 520         let network = args.network;
 521         let bitcoind_rpc = bitcoind_client.clone();
 522         let handle = tokio::runtime::Handle::current();
 523         let event_handler = move |event| {
 524                 handle.block_on(handle_ldk_events(
 525                         channel_manager_event_listener.clone(),
 526                         bitcoind_rpc.clone(),
 527                         keys_manager_listener.clone(),
 528                         inbound_pmts_for_events.clone(),
 529                         outbound_pmts_for_events.clone(),
 530                         network,
 531                         event,
 532                 ))
 533         };
 534         // Step 16: Persist ChannelManager
 535         let data_dir = ldk_data_dir.clone();
 536         let persist_channel_manager_callback =
 537                 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
 538         // Step 17: Background Processing
 539         BackgroundProcessor::start(
 540                 persist_channel_manager_callback,
 541                 event_handler,
 542                 chain_monitor.clone(),
 543                 channel_manager.clone(),
 544                 peer_manager.clone(),
 545                 logger.clone(),
 546         );
 547
 548         // Reconnect to channel peers if possible.
 549         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 550         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 551                 Ok(mut info) => {
 552                         for (pubkey, peer_addr) in info.drain() {
 553                                 for chan_info in channel_manager.list_channels() {
 554                                         if pubkey == chan_info.counterparty.node_id {
 555                                                 let _ =
 556                                                         cli::connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone())
 557                                                                 .await;
 558                                         }
 559                                 }
 560                         }
 561                 }
 562                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 563         }
 564
 565         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 566         // some public channels, and is only useful if we have public listen address(es) to announce.
 567         // In a production environment, this should occur only after the announcement of new channels
 568         // to avoid churn in the global network graph.
 569         let chan_manager = Arc::clone(&channel_manager);
 570         let network = args.network;
 571         if args.ldk_announced_listen_addr.is_some() {
 572                 tokio::spawn(async move {
 573                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 574                         loop {
 575                                 interval.tick().await;
 576                                 chan_manager.broadcast_node_announcement(
 577                                         [0; 3],
 578                                         args.ldk_announced_node_name,
 579                                         vec![args.ldk_announced_listen_addr.as_ref().unwrap().clone()],
 580                                 );
 581                         }
 582                 });
 583         }
 584
 585         // Start the CLI.
 586         cli::poll_for_user_input(
 587                 peer_manager.clone(),
 588                 channel_manager.clone(),
 589                 keys_manager.clone(),
 590                 router.clone(),
 591                 inbound_payments,
 592                 outbound_payments,
 593                 ldk_data_dir.clone(),
 594                 logger.clone(),
 595                 network,
 596         )
 597         .await;
 598 }
 599
 600 #[tokio::main]
 601 pub async fn main() {
 602         start_ldk().await;
 603 }