_ 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::network::constants::Network;
  13 use bitcoin::secp256k1::Secp256k1;
  14 use bitcoin::BlockHash;
  15 use bitcoin_bech32::WitnessProgram;
  16 use lightning::chain;
  17 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  18 use lightning::chain::chainmonitor;
  19 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
  20 use lightning::chain::{BestBlock, Filter, Watch};
  21 use lightning::ln::channelmanager;
  22 use lightning::ln::channelmanager::{
  23         ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
  24 };
  25 use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler, SimpleArcPeerManager};
  26 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  27 use lightning::routing::network_graph::{NetGraphMsgHandler, NetworkGraph};
  28 use lightning::routing::scorer::Scorer;
  29 use lightning::util::config::UserConfig;
  30 use lightning::util::events::{Event, PaymentPurpose};
  31 use lightning::util::ser::ReadableArgs;
  32 use lightning_background_processor::BackgroundProcessor;
  33 use lightning_block_sync::init;
  34 use lightning_block_sync::poll;
  35 use lightning_block_sync::SpvClient;
  36 use lightning_block_sync::UnboundedCache;
  37 use lightning_invoice::payment;
  38 use lightning_invoice::utils::DefaultRouter;
  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 pub(crate) type InvoicePayer<E> = payment::InvoicePayer<
 102         Arc<ChannelManager>,
 103         Router,
 104         Arc<Mutex<Scorer>>,
 105         Arc<FilesystemLogger>,
 106         E,
 107 >;
 108
 109 type Router = DefaultRouter<Arc<NetworkGraph>, Arc<FilesystemLogger>>;
 110
 111 async fn handle_ldk_events(
 112         channel_manager: Arc<ChannelManager>, bitcoind_client: Arc<BitcoindClient>,
 113         keys_manager: Arc<KeysManager>, inbound_payments: PaymentInfoStorage,
 114         outbound_payments: PaymentInfoStorage, network: Network, event: &Event,
 115 ) {
 116         match event {
 117                 Event::FundingGenerationReady {
 118                         temporary_channel_id,
 119                         channel_value_satoshis,
 120                         output_script,
 121                         ..
 122                 } => {
 123                         // Construct the raw transaction with one output, that is paid the amount of the
 124                         // channel.
 125                         let addr = WitnessProgram::from_scriptpubkey(
 126                                 &output_script[..],
 127                                 match network {
 128                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 129                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 130                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 131                                         Network::Signet => panic!("Signet unsupported"),
 132                                 },
 133                         )
 134                         .expect("Lightning funding tx should always be to a SegWit output")
 135                         .to_address();
 136                         let mut outputs = vec![HashMap::with_capacity(1)];
 137                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 138                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 139
 140                         // Have your wallet put the inputs into the transaction such that the output is
 141                         // satisfied.
 142                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 143
 144                         // Sign the final funding transaction and broadcast it.
 145                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 146                         assert_eq!(signed_tx.complete, true);
 147                         let final_tx: Transaction =
 148                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 149                         // Give the funding transaction back to LDK for opening the channel.
 150                         if channel_manager
 151                                 .funding_transaction_generated(&temporary_channel_id, final_tx)
 152                                 .is_err()
 153                         {
 154                                 println!(
 155                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 156                                 print!("> ");
 157                                 io::stdout().flush().unwrap();
 158                         }
 159                 }
 160                 Event::PaymentReceived { payment_hash, purpose, amt, .. } => {
 161                         let mut payments = inbound_payments.lock().unwrap();
 162                         let (payment_preimage, payment_secret) = match purpose {
 163                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 164                                         (*payment_preimage, Some(*payment_secret))
 165                                 }
 166                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 167                         };
 168                         let status = match channel_manager.claim_funds(payment_preimage.unwrap()) {
 169                                 true => {
 170                                         println!(
 171                                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 172                                                 hex_utils::hex_str(&payment_hash.0),
 173                                                 amt
 174                                         );
 175                                         print!("> ");
 176                                         io::stdout().flush().unwrap();
 177                                         HTLCStatus::Succeeded
 178                                 }
 179                                 _ => HTLCStatus::Failed,
 180                         };
 181                         match payments.entry(*payment_hash) {
 182                                 Entry::Occupied(mut e) => {
 183                                         let payment = e.get_mut();
 184                                         payment.status = status;
 185                                         payment.preimage = payment_preimage;
 186                                         payment.secret = payment_secret;
 187                                 }
 188                                 Entry::Vacant(e) => {
 189                                         e.insert(PaymentInfo {
 190                                                 preimage: payment_preimage,
 191                                                 secret: payment_secret,
 192                                                 status,
 193                                                 amt_msat: MillisatAmount(Some(*amt)),
 194                                         });
 195                                 }
 196                         }
 197                 }
 198                 Event::PaymentSent { payment_preimage, payment_hash, .. } => {
 199                         let mut payments = outbound_payments.lock().unwrap();
 200                         for (hash, payment) in payments.iter_mut() {
 201                                 if *hash == *payment_hash {
 202                                         payment.preimage = Some(*payment_preimage);
 203                                         payment.status = HTLCStatus::Succeeded;
 204                                         println!(
 205                                                 "\nEVENT: successfully sent payment of {} millisatoshis from \
 206                                                                  payment hash {:?} with preimage {:?}",
 207                                                 payment.amt_msat,
 208                                                 hex_utils::hex_str(&payment_hash.0),
 209                                                 hex_utils::hex_str(&payment_preimage.0)
 210                                         );
 211                                         print!("> ");
 212                                         io::stdout().flush().unwrap();
 213                                 }
 214                         }
 215                 }
 216                 Event::PaymentPathFailed {
 217                         payment_hash,
 218                         rejected_by_dest,
 219                         all_paths_failed,
 220                         short_channel_id,
 221                         ..
 222                 } => {
 223                         print!(
 224                                 "\nEVENT: Failed to send payment{} to payment hash {:?}",
 225                                 if *all_paths_failed { "" } else { " along MPP path" },
 226                                 hex_utils::hex_str(&payment_hash.0)
 227                         );
 228                         if let Some(scid) = short_channel_id {
 229                                 print!(" because of failure at channel {}", scid);
 230                         }
 231                         if *rejected_by_dest {
 232                                 println!(": re-attempting the payment will not succeed");
 233                         } else {
 234                                 println!(": exhausted payment retry attempts");
 235                         }
 236                         print!("> ");
 237                         io::stdout().flush().unwrap();
 238
 239                         let mut payments = outbound_payments.lock().unwrap();
 240                         if payments.contains_key(&payment_hash) {
 241                                 let payment = payments.get_mut(&payment_hash).unwrap();
 242                                 payment.status = HTLCStatus::Failed;
 243                         }
 244                 }
 245                 Event::PaymentForwarded { fee_earned_msat, claim_from_onchain_tx } => {
 246                         let from_onchain_str = if *claim_from_onchain_tx {
 247                                 "from onchain downstream claim"
 248                         } else {
 249                                 "from HTLC fulfill message"
 250                         };
 251                         if let Some(fee_earned) = fee_earned_msat {
 252                                 println!(
 253                                         "\nEVENT: Forwarded payment, earning {} msat {}",
 254                                         fee_earned, from_onchain_str
 255                                 );
 256                         } else {
 257                                 println!("\nEVENT: Forwarded payment, claiming onchain {}", from_onchain_str);
 258                         }
 259                         print!("> ");
 260                         io::stdout().flush().unwrap();
 261                 }
 262                 Event::PendingHTLCsForwardable { time_forwardable } => {
 263                         let forwarding_channel_manager = channel_manager.clone();
 264                         let min = time_forwardable.as_millis() as u64;
 265                         tokio::spawn(async move {
 266                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 267                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 268                                 forwarding_channel_manager.process_pending_htlc_forwards();
 269                         });
 270                 }
 271                 Event::SpendableOutputs { outputs } => {
 272                         let destination_address = bitcoind_client.get_new_address().await;
 273                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 274                         let tx_feerate =
 275                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 276                         let spending_tx = keys_manager
 277                                 .spend_spendable_outputs(
 278                                         output_descriptors,
 279                                         Vec::new(),
 280                                         destination_address.script_pubkey(),
 281                                         tx_feerate,
 282                                         &Secp256k1::new(),
 283                                 )
 284                                 .unwrap();
 285                         bitcoind_client.broadcast_transaction(&spending_tx);
 286                 }
 287                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 288                         println!(
 289                                 "\nEVENT: Channel {} closed due to: {:?}",
 290                                 hex_utils::hex_str(channel_id),
 291                                 reason
 292                         );
 293                         print!("> ");
 294                         io::stdout().flush().unwrap();
 295                 }
 296                 Event::DiscardFunding { .. } => {
 297                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 298                         // the funding transaction either confirms, or this event is generated.
 299                 }
 300         }
 301 }
 302
 303 async fn start_ldk() {
 304         let args = match cli::parse_startup_args() {
 305                 Ok(user_args) => user_args,
 306                 Err(()) => return,
 307         };
 308
 309         // Initialize the LDK data directory if necessary.
 310         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 311         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 312
 313         // Initialize our bitcoind client.
 314         let bitcoind_client = match BitcoindClient::new(
 315                 args.bitcoind_rpc_host.clone(),
 316                 args.bitcoind_rpc_port,
 317                 args.bitcoind_rpc_username.clone(),
 318                 args.bitcoind_rpc_password.clone(),
 319                 tokio::runtime::Handle::current(),
 320         )
 321         .await
 322         {
 323                 Ok(client) => Arc::new(client),
 324                 Err(e) => {
 325                         println!("Failed to connect to bitcoind client: {}", e);
 326                         return;
 327                 }
 328         };
 329
 330         // Check that the bitcoind we've connected to is running the network we expect
 331         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 332         if bitcoind_chain
 333                 != match args.network {
 334                         bitcoin::Network::Bitcoin => "main",
 335                         bitcoin::Network::Testnet => "test",
 336                         bitcoin::Network::Regtest => "regtest",
 337                         bitcoin::Network::Signet => "signet",
 338                 } {
 339                 println!(
 340                         "Chain argument ({}) didn't match bitcoind chain ({})",
 341                         args.network, bitcoind_chain
 342                 );
 343                 return;
 344         }
 345
 346         // ## Setup
 347         // Step 1: Initialize the FeeEstimator
 348
 349         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 350         let fee_estimator = bitcoind_client.clone();
 351
 352         // Step 2: Initialize the Logger
 353         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 354
 355         // Step 3: Initialize the BroadcasterInterface
 356
 357         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 358         // broadcaster.
 359         let broadcaster = bitcoind_client.clone();
 360
 361         // Step 4: Initialize Persist
 362         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 363
 364         // Step 5: Initialize the ChainMonitor
 365         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 366                 None,
 367                 broadcaster.clone(),
 368                 logger.clone(),
 369                 fee_estimator.clone(),
 370                 persister.clone(),
 371         ));
 372
 373         // Step 6: Initialize the KeysManager
 374
 375         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 376         // other secret key material.
 377         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 378         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 379                 assert_eq!(seed.len(), 32);
 380                 let mut key = [0; 32];
 381                 key.copy_from_slice(&seed);
 382                 key
 383         } else {
 384                 let mut key = [0; 32];
 385                 thread_rng().fill_bytes(&mut key);
 386                 match File::create(keys_seed_path.clone()) {
 387                         Ok(mut f) => {
 388                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 389                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 390                         }
 391                         Err(e) => {
 392                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 393                                 return;
 394                         }
 395                 }
 396                 key
 397         };
 398         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 399         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 400
 401         // Step 7: Read ChannelMonitor state from disk
 402         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 403
 404         // Step 8: Initialize the ChannelManager
 405         let mut user_config = UserConfig::default();
 406         user_config.peer_channel_config_limits.force_announced_channel_preference = false;
 407         let mut restarting_node = true;
 408         let (channel_manager_blockhash, mut channel_manager) = {
 409                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 410                         let mut channel_monitor_mut_references = Vec::new();
 411                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 412                                 channel_monitor_mut_references.push(channel_monitor);
 413                         }
 414                         let read_args = ChannelManagerReadArgs::new(
 415                                 keys_manager.clone(),
 416                                 fee_estimator.clone(),
 417                                 chain_monitor.clone(),
 418                                 broadcaster.clone(),
 419                                 logger.clone(),
 420                                 user_config,
 421                                 channel_monitor_mut_references,
 422                         );
 423                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 424                 } else {
 425                         // We're starting a fresh node.
 426                         restarting_node = false;
 427                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 428
 429                         let chain_params = ChainParameters {
 430                                 network: args.network,
 431                                 best_block: BestBlock::new(
 432                                         getinfo_resp.latest_blockhash,
 433                                         getinfo_resp.latest_height as u32,
 434                                 ),
 435                         };
 436                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 437                                 fee_estimator.clone(),
 438                                 chain_monitor.clone(),
 439                                 broadcaster.clone(),
 440                                 logger.clone(),
 441                                 keys_manager.clone(),
 442                                 user_config,
 443                                 chain_params,
 444                         );
 445                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 446                 }
 447         };
 448
 449         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 450         let mut chain_listener_channel_monitors = Vec::new();
 451         let mut cache = UnboundedCache::new();
 452         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 453         if restarting_node {
 454                 let mut chain_listeners =
 455                         vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
 456
 457                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 458                         let outpoint = channel_monitor.get_funding_txo().0;
 459                         chain_listener_channel_monitors.push((
 460                                 blockhash,
 461                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 462                                 outpoint,
 463                         ));
 464                 }
 465
 466                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 467                         chain_listeners.push((
 468                                 monitor_listener_info.0,
 469                                 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
 470                         ));
 471                 }
 472                 chain_tip = Some(
 473                         init::synchronize_listeners(
 474                                 &mut bitcoind_client.deref(),
 475                                 args.network,
 476                                 &mut cache,
 477                                 chain_listeners,
 478                         )
 479                         .await
 480                         .unwrap(),
 481                 );
 482         }
 483
 484         // Step 10: Give ChannelMonitors to ChainMonitor
 485         for item in chain_listener_channel_monitors.drain(..) {
 486                 let channel_monitor = item.1 .0;
 487                 let funding_outpoint = item.2;
 488                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 489         }
 490
 491         // Step 11: Optional: Initialize the NetGraphMsgHandler
 492         let genesis = genesis_block(args.network).header.block_hash();
 493         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 494         let network_graph = Arc::new(disk::read_network(Path::new(&network_graph_path), genesis));
 495         let network_gossip = Arc::new(NetGraphMsgHandler::new(
 496                 Arc::clone(&network_graph),
 497                 None::<Arc<dyn chain::Access + Send + Sync>>,
 498                 logger.clone(),
 499         ));
 500         let network_graph_persist = Arc::clone(&network_graph);
 501         tokio::spawn(async move {
 502                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 503                 loop {
 504                         interval.tick().await;
 505                         if disk::persist_network(Path::new(&network_graph_path), &network_graph_persist)
 506                                 .is_err()
 507                         {
 508                                 // Persistence errors here are non-fatal as we can just fetch the routing graph
 509                                 // again later, but they may indicate a disk error which could be fatal elsewhere.
 510                                 eprintln!(
 511                                         "Warning: Failed to persist network graph, check your disk and permissions"
 512                                 );
 513                         }
 514                 }
 515         });
 516
 517         // Step 12: Initialize the PeerManager
 518         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 519         let mut ephemeral_bytes = [0; 32];
 520         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 521         let lightning_msg_handler = MessageHandler {
 522                 chan_handler: channel_manager.clone(),
 523                 route_handler: network_gossip.clone(),
 524         };
 525         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 526                 lightning_msg_handler,
 527                 keys_manager.get_node_secret(),
 528                 &ephemeral_bytes,
 529                 logger.clone(),
 530                 Arc::new(IgnoringMessageHandler {}),
 531         ));
 532
 533         // ## Running LDK
 534         // Step 13: Initialize networking
 535
 536         let peer_manager_connection_handler = peer_manager.clone();
 537         let listening_port = args.ldk_peer_listening_port;
 538         tokio::spawn(async move {
 539                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 540                         .await
 541                         .expect("Failed to bind to listen port - is something else already listening on it?");
 542                 loop {
 543                         let peer_mgr = peer_manager_connection_handler.clone();
 544                         let tcp_stream = listener.accept().await.unwrap().0;
 545                         tokio::spawn(async move {
 546                                 lightning_net_tokio::setup_inbound(
 547                                         peer_mgr.clone(),
 548                                         tcp_stream.into_std().unwrap(),
 549                                 )
 550                                 .await;
 551                         });
 552                 }
 553         });
 554
 555         // Step 14: Connect and Disconnect Blocks
 556         if chain_tip.is_none() {
 557                 chain_tip =
 558                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 559         }
 560         let channel_manager_listener = channel_manager.clone();
 561         let chain_monitor_listener = chain_monitor.clone();
 562         let bitcoind_block_source = bitcoind_client.clone();
 563         let network = args.network;
 564         tokio::spawn(async move {
 565                 let mut derefed = bitcoind_block_source.deref();
 566                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 567                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 568                 let mut spv_client =
 569                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 570                 loop {
 571                         spv_client.poll_best_tip().await.unwrap();
 572                         tokio::time::sleep(Duration::from_secs(1)).await;
 573                 }
 574         });
 575
 576         // Step 15: Handle LDK Events
 577         let channel_manager_event_listener = channel_manager.clone();
 578         let keys_manager_listener = keys_manager.clone();
 579         // TODO: persist payment info to disk
 580         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 581         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 582         let inbound_pmts_for_events = inbound_payments.clone();
 583         let outbound_pmts_for_events = outbound_payments.clone();
 584         let network = args.network;
 585         let bitcoind_rpc = bitcoind_client.clone();
 586         let handle = tokio::runtime::Handle::current();
 587         let event_handler = move |event: &Event| {
 588                 handle.block_on(handle_ldk_events(
 589                         channel_manager_event_listener.clone(),
 590                         bitcoind_rpc.clone(),
 591                         keys_manager_listener.clone(),
 592                         inbound_pmts_for_events.clone(),
 593                         outbound_pmts_for_events.clone(),
 594                         network,
 595                         event,
 596                 ));
 597         };
 598
 599         // Step 16: Initialize routing Scorer
 600         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 601         let scorer = Arc::new(Mutex::new(disk::read_scorer(Path::new(&scorer_path))));
 602         let scorer_persist = Arc::clone(&scorer);
 603         tokio::spawn(async move {
 604                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 605                 loop {
 606                         interval.tick().await;
 607                         if disk::persist_scorer(Path::new(&scorer_path), &scorer_persist.lock().unwrap())
 608                                 .is_err()
 609                         {
 610                                 // Persistence errors here are non-fatal as channels will be re-scored as payments
 611                                 // fail, but they may indicate a disk error which could be fatal elsewhere.
 612                                 eprintln!("Warning: Failed to persist scorer, check your disk and permissions");
 613                         }
 614                 }
 615         });
 616
 617         // Step 17: Create InvoicePayer
 618         let router = DefaultRouter::new(network_graph.clone(), logger.clone());
 619         let invoice_payer = Arc::new(InvoicePayer::new(
 620                 channel_manager.clone(),
 621                 router,
 622                 scorer.clone(),
 623                 logger.clone(),
 624                 event_handler,
 625                 payment::RetryAttempts(5),
 626         ));
 627
 628         // Step 18: Persist ChannelManager
 629         let data_dir = ldk_data_dir.clone();
 630         let persist_channel_manager_callback =
 631                 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
 632
 633         // Step 19: Background Processing
 634         let background_processor = BackgroundProcessor::start(
 635                 persist_channel_manager_callback,
 636                 invoice_payer.clone(),
 637                 chain_monitor.clone(),
 638                 channel_manager.clone(),
 639                 Some(network_gossip.clone()),
 640                 peer_manager.clone(),
 641                 logger.clone(),
 642         );
 643
 644         // Regularly reconnect to channel peers.
 645         let connect_cm = Arc::clone(&channel_manager);
 646         let connect_pm = Arc::clone(&peer_manager);
 647         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 648         tokio::spawn(async move {
 649                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 650                 loop {
 651                         interval.tick().await;
 652                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 653                                 Ok(info) => {
 654                                         let peers = connect_pm.get_peer_node_ids();
 655                                         for node_id in connect_cm
 656                                                 .list_channels()
 657                                                 .iter()
 658                                                 .map(|chan| chan.counterparty.node_id)
 659                                                 .filter(|id| !peers.contains(id))
 660                                         {
 661                                                 for (pubkey, peer_addr) in info.iter() {
 662                                                         if *pubkey == node_id {
 663                                                                 let _ = cli::do_connect_peer(
 664                                                                         *pubkey,
 665                                                                         peer_addr.clone(),
 666                                                                         Arc::clone(&connect_pm),
 667                                                                 )
 668                                                                 .await;
 669                                                         }
 670                                                 }
 671                                         }
 672                                 }
 673                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 674                         }
 675                 }
 676         });
 677
 678         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 679         // some public channels, and is only useful if we have public listen address(es) to announce.
 680         // In a production environment, this should occur only after the announcement of new channels
 681         // to avoid churn in the global network graph.
 682         let chan_manager = Arc::clone(&channel_manager);
 683         let network = args.network;
 684         if !args.ldk_announced_listen_addr.is_empty() {
 685                 tokio::spawn(async move {
 686                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 687                         loop {
 688                                 interval.tick().await;
 689                                 chan_manager.broadcast_node_announcement(
 690                                         [0; 3],
 691                                         args.ldk_announced_node_name,
 692                                         args.ldk_announced_listen_addr.clone(),
 693                                 );
 694                         }
 695                 });
 696         }
 697
 698         // Start the CLI.
 699         cli::poll_for_user_input(
 700                 invoice_payer.clone(),
 701                 peer_manager.clone(),
 702                 channel_manager.clone(),
 703                 keys_manager.clone(),
 704                 network_graph.clone(),
 705                 scorer.clone(),
 706                 inbound_payments,
 707                 outbound_payments,
 708                 ldk_data_dir.clone(),
 709                 logger.clone(),
 710                 network,
 711         )
 712         .await;
 713
 714         // Stop the background processor.
 715         background_processor.stop().unwrap();
 716 }
 717
 718 #[tokio::main]
 719 pub async fn main() {
 720         start_ldk().await;
 721 }