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