_ 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::scoring::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::PaymentPathSuccessful { .. } => {}
 217                 Event::PaymentPathFailed { .. } => {}
 218                 Event::PaymentFailed { payment_hash, .. } => {
 219                         print!(
 220                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 221                                 hex_utils::hex_str(&payment_hash.0)
 222                         );
 223                         print!("> ");
 224                         io::stdout().flush().unwrap();
 225
 226                         let mut payments = outbound_payments.lock().unwrap();
 227                         if payments.contains_key(&payment_hash) {
 228                                 let payment = payments.get_mut(&payment_hash).unwrap();
 229                                 payment.status = HTLCStatus::Failed;
 230                         }
 231                 }
 232                 Event::PaymentForwarded { fee_earned_msat, claim_from_onchain_tx } => {
 233                         let from_onchain_str = if *claim_from_onchain_tx {
 234                                 "from onchain downstream claim"
 235                         } else {
 236                                 "from HTLC fulfill message"
 237                         };
 238                         if let Some(fee_earned) = fee_earned_msat {
 239                                 println!(
 240                                         "\nEVENT: Forwarded payment, earning {} msat {}",
 241                                         fee_earned, from_onchain_str
 242                                 );
 243                         } else {
 244                                 println!("\nEVENT: Forwarded payment, claiming onchain {}", from_onchain_str);
 245                         }
 246                         print!("> ");
 247                         io::stdout().flush().unwrap();
 248                 }
 249                 Event::PendingHTLCsForwardable { time_forwardable } => {
 250                         let forwarding_channel_manager = channel_manager.clone();
 251                         let min = time_forwardable.as_millis() as u64;
 252                         tokio::spawn(async move {
 253                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 254                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 255                                 forwarding_channel_manager.process_pending_htlc_forwards();
 256                         });
 257                 }
 258                 Event::SpendableOutputs { outputs } => {
 259                         let destination_address = bitcoind_client.get_new_address().await;
 260                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 261                         let tx_feerate =
 262                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 263                         let spending_tx = keys_manager
 264                                 .spend_spendable_outputs(
 265                                         output_descriptors,
 266                                         Vec::new(),
 267                                         destination_address.script_pubkey(),
 268                                         tx_feerate,
 269                                         &Secp256k1::new(),
 270                                 )
 271                                 .unwrap();
 272                         bitcoind_client.broadcast_transaction(&spending_tx);
 273                 }
 274                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 275                         println!(
 276                                 "\nEVENT: Channel {} closed due to: {:?}",
 277                                 hex_utils::hex_str(channel_id),
 278                                 reason
 279                         );
 280                         print!("> ");
 281                         io::stdout().flush().unwrap();
 282                 }
 283                 Event::DiscardFunding { .. } => {
 284                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 285                         // the funding transaction either confirms, or this event is generated.
 286                 }
 287         }
 288 }
 289
 290 async fn start_ldk() {
 291         let args = match cli::parse_startup_args() {
 292                 Ok(user_args) => user_args,
 293                 Err(()) => return,
 294         };
 295
 296         // Initialize the LDK data directory if necessary.
 297         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 298         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 299
 300         // Initialize our bitcoind client.
 301         let bitcoind_client = match BitcoindClient::new(
 302                 args.bitcoind_rpc_host.clone(),
 303                 args.bitcoind_rpc_port,
 304                 args.bitcoind_rpc_username.clone(),
 305                 args.bitcoind_rpc_password.clone(),
 306                 tokio::runtime::Handle::current(),
 307         )
 308         .await
 309         {
 310                 Ok(client) => Arc::new(client),
 311                 Err(e) => {
 312                         println!("Failed to connect to bitcoind client: {}", e);
 313                         return;
 314                 }
 315         };
 316
 317         // Check that the bitcoind we've connected to is running the network we expect
 318         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 319         if bitcoind_chain
 320                 != match args.network {
 321                         bitcoin::Network::Bitcoin => "main",
 322                         bitcoin::Network::Testnet => "test",
 323                         bitcoin::Network::Regtest => "regtest",
 324                         bitcoin::Network::Signet => "signet",
 325                 } {
 326                 println!(
 327                         "Chain argument ({}) didn't match bitcoind chain ({})",
 328                         args.network, bitcoind_chain
 329                 );
 330                 return;
 331         }
 332
 333         // ## Setup
 334         // Step 1: Initialize the FeeEstimator
 335
 336         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 337         let fee_estimator = bitcoind_client.clone();
 338
 339         // Step 2: Initialize the Logger
 340         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 341
 342         // Step 3: Initialize the BroadcasterInterface
 343
 344         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 345         // broadcaster.
 346         let broadcaster = bitcoind_client.clone();
 347
 348         // Step 4: Initialize Persist
 349         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 350
 351         // Step 5: Initialize the ChainMonitor
 352         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 353                 None,
 354                 broadcaster.clone(),
 355                 logger.clone(),
 356                 fee_estimator.clone(),
 357                 persister.clone(),
 358         ));
 359
 360         // Step 6: Initialize the KeysManager
 361
 362         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 363         // other secret key material.
 364         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 365         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 366                 assert_eq!(seed.len(), 32);
 367                 let mut key = [0; 32];
 368                 key.copy_from_slice(&seed);
 369                 key
 370         } else {
 371                 let mut key = [0; 32];
 372                 thread_rng().fill_bytes(&mut key);
 373                 match File::create(keys_seed_path.clone()) {
 374                         Ok(mut f) => {
 375                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 376                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 377                         }
 378                         Err(e) => {
 379                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 380                                 return;
 381                         }
 382                 }
 383                 key
 384         };
 385         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 386         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 387
 388         // Step 7: Read ChannelMonitor state from disk
 389         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 390
 391         // Step 8: Initialize the ChannelManager
 392         let mut user_config = UserConfig::default();
 393         user_config.peer_channel_config_limits.force_announced_channel_preference = false;
 394         let mut restarting_node = true;
 395         let (channel_manager_blockhash, mut channel_manager) = {
 396                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 397                         let mut channel_monitor_mut_references = Vec::new();
 398                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 399                                 channel_monitor_mut_references.push(channel_monitor);
 400                         }
 401                         let read_args = ChannelManagerReadArgs::new(
 402                                 keys_manager.clone(),
 403                                 fee_estimator.clone(),
 404                                 chain_monitor.clone(),
 405                                 broadcaster.clone(),
 406                                 logger.clone(),
 407                                 user_config,
 408                                 channel_monitor_mut_references,
 409                         );
 410                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 411                 } else {
 412                         // We're starting a fresh node.
 413                         restarting_node = false;
 414                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 415
 416                         let chain_params = ChainParameters {
 417                                 network: args.network,
 418                                 best_block: BestBlock::new(
 419                                         getinfo_resp.latest_blockhash,
 420                                         getinfo_resp.latest_height as u32,
 421                                 ),
 422                         };
 423                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 424                                 fee_estimator.clone(),
 425                                 chain_monitor.clone(),
 426                                 broadcaster.clone(),
 427                                 logger.clone(),
 428                                 keys_manager.clone(),
 429                                 user_config,
 430                                 chain_params,
 431                         );
 432                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 433                 }
 434         };
 435
 436         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 437         let mut chain_listener_channel_monitors = Vec::new();
 438         let mut cache = UnboundedCache::new();
 439         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 440         if restarting_node {
 441                 let mut chain_listeners =
 442                         vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
 443
 444                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 445                         let outpoint = channel_monitor.get_funding_txo().0;
 446                         chain_listener_channel_monitors.push((
 447                                 blockhash,
 448                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 449                                 outpoint,
 450                         ));
 451                 }
 452
 453                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 454                         chain_listeners.push((
 455                                 monitor_listener_info.0,
 456                                 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
 457                         ));
 458                 }
 459                 chain_tip = Some(
 460                         init::synchronize_listeners(
 461                                 &mut bitcoind_client.deref(),
 462                                 args.network,
 463                                 &mut cache,
 464                                 chain_listeners,
 465                         )
 466                         .await
 467                         .unwrap(),
 468                 );
 469         }
 470
 471         // Step 10: Give ChannelMonitors to ChainMonitor
 472         for item in chain_listener_channel_monitors.drain(..) {
 473                 let channel_monitor = item.1 .0;
 474                 let funding_outpoint = item.2;
 475                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 476         }
 477
 478         // Step 11: Optional: Initialize the NetGraphMsgHandler
 479         let genesis = genesis_block(args.network).header.block_hash();
 480         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 481         let network_graph = Arc::new(disk::read_network(Path::new(&network_graph_path), genesis));
 482         let network_gossip = Arc::new(NetGraphMsgHandler::new(
 483                 Arc::clone(&network_graph),
 484                 None::<Arc<dyn chain::Access + Send + Sync>>,
 485                 logger.clone(),
 486         ));
 487         let network_graph_persist = Arc::clone(&network_graph);
 488         tokio::spawn(async move {
 489                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 490                 loop {
 491                         interval.tick().await;
 492                         if disk::persist_network(Path::new(&network_graph_path), &network_graph_persist)
 493                                 .is_err()
 494                         {
 495                                 // Persistence errors here are non-fatal as we can just fetch the routing graph
 496                                 // again later, but they may indicate a disk error which could be fatal elsewhere.
 497                                 eprintln!(
 498                                         "Warning: Failed to persist network graph, check your disk and permissions"
 499                                 );
 500                         }
 501                 }
 502         });
 503
 504         // Step 12: Initialize the PeerManager
 505         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 506         let mut ephemeral_bytes = [0; 32];
 507         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 508         let lightning_msg_handler = MessageHandler {
 509                 chan_handler: channel_manager.clone(),
 510                 route_handler: network_gossip.clone(),
 511         };
 512         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 513                 lightning_msg_handler,
 514                 keys_manager.get_node_secret(),
 515                 &ephemeral_bytes,
 516                 logger.clone(),
 517                 Arc::new(IgnoringMessageHandler {}),
 518         ));
 519
 520         // ## Running LDK
 521         // Step 13: Initialize networking
 522
 523         let peer_manager_connection_handler = peer_manager.clone();
 524         let listening_port = args.ldk_peer_listening_port;
 525         tokio::spawn(async move {
 526                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 527                         .await
 528                         .expect("Failed to bind to listen port - is something else already listening on it?");
 529                 loop {
 530                         let peer_mgr = peer_manager_connection_handler.clone();
 531                         let tcp_stream = listener.accept().await.unwrap().0;
 532                         tokio::spawn(async move {
 533                                 lightning_net_tokio::setup_inbound(
 534                                         peer_mgr.clone(),
 535                                         tcp_stream.into_std().unwrap(),
 536                                 )
 537                                 .await;
 538                         });
 539                 }
 540         });
 541
 542         // Step 14: Connect and Disconnect Blocks
 543         if chain_tip.is_none() {
 544                 chain_tip =
 545                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 546         }
 547         let channel_manager_listener = channel_manager.clone();
 548         let chain_monitor_listener = chain_monitor.clone();
 549         let bitcoind_block_source = bitcoind_client.clone();
 550         let network = args.network;
 551         tokio::spawn(async move {
 552                 let mut derefed = bitcoind_block_source.deref();
 553                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 554                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 555                 let mut spv_client =
 556                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 557                 loop {
 558                         spv_client.poll_best_tip().await.unwrap();
 559                         tokio::time::sleep(Duration::from_secs(1)).await;
 560                 }
 561         });
 562
 563         // Step 15: Handle LDK Events
 564         let channel_manager_event_listener = channel_manager.clone();
 565         let keys_manager_listener = keys_manager.clone();
 566         // TODO: persist payment info to disk
 567         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 568         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 569         let inbound_pmts_for_events = inbound_payments.clone();
 570         let outbound_pmts_for_events = outbound_payments.clone();
 571         let network = args.network;
 572         let bitcoind_rpc = bitcoind_client.clone();
 573         let handle = tokio::runtime::Handle::current();
 574         let event_handler = move |event: &Event| {
 575                 handle.block_on(handle_ldk_events(
 576                         channel_manager_event_listener.clone(),
 577                         bitcoind_rpc.clone(),
 578                         keys_manager_listener.clone(),
 579                         inbound_pmts_for_events.clone(),
 580                         outbound_pmts_for_events.clone(),
 581                         network,
 582                         event,
 583                 ));
 584         };
 585
 586         // Step 16: Initialize routing Scorer
 587         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 588         let scorer = Arc::new(Mutex::new(disk::read_scorer(Path::new(&scorer_path))));
 589         let scorer_persist = Arc::clone(&scorer);
 590         tokio::spawn(async move {
 591                 let mut interval = tokio::time::interval(Duration::from_secs(600));
 592                 loop {
 593                         interval.tick().await;
 594                         if disk::persist_scorer(Path::new(&scorer_path), &scorer_persist.lock().unwrap())
 595                                 .is_err()
 596                         {
 597                                 // Persistence errors here are non-fatal as channels will be re-scored as payments
 598                                 // fail, but they may indicate a disk error which could be fatal elsewhere.
 599                                 eprintln!("Warning: Failed to persist scorer, check your disk and permissions");
 600                         }
 601                 }
 602         });
 603
 604         // Step 17: Create InvoicePayer
 605         let router = DefaultRouter::new(network_graph.clone(), logger.clone());
 606         let invoice_payer = Arc::new(InvoicePayer::new(
 607                 channel_manager.clone(),
 608                 router,
 609                 scorer.clone(),
 610                 logger.clone(),
 611                 event_handler,
 612                 payment::RetryAttempts(5),
 613         ));
 614
 615         // Step 18: Persist ChannelManager
 616         let data_dir = ldk_data_dir.clone();
 617         let persist_channel_manager_callback =
 618                 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
 619
 620         // Step 19: Background Processing
 621         let background_processor = BackgroundProcessor::start(
 622                 persist_channel_manager_callback,
 623                 invoice_payer.clone(),
 624                 chain_monitor.clone(),
 625                 channel_manager.clone(),
 626                 Some(network_gossip.clone()),
 627                 peer_manager.clone(),
 628                 logger.clone(),
 629         );
 630
 631         // Regularly reconnect to channel peers.
 632         let connect_cm = Arc::clone(&channel_manager);
 633         let connect_pm = Arc::clone(&peer_manager);
 634         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 635         tokio::spawn(async move {
 636                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 637                 loop {
 638                         interval.tick().await;
 639                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 640                                 Ok(info) => {
 641                                         let peers = connect_pm.get_peer_node_ids();
 642                                         for node_id in connect_cm
 643                                                 .list_channels()
 644                                                 .iter()
 645                                                 .map(|chan| chan.counterparty.node_id)
 646                                                 .filter(|id| !peers.contains(id))
 647                                         {
 648                                                 for (pubkey, peer_addr) in info.iter() {
 649                                                         if *pubkey == node_id {
 650                                                                 let _ = cli::do_connect_peer(
 651                                                                         *pubkey,
 652                                                                         peer_addr.clone(),
 653                                                                         Arc::clone(&connect_pm),
 654                                                                 )
 655                                                                 .await;
 656                                                         }
 657                                                 }
 658                                         }
 659                                 }
 660                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 661                         }
 662                 }
 663         });
 664
 665         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 666         // some public channels, and is only useful if we have public listen address(es) to announce.
 667         // In a production environment, this should occur only after the announcement of new channels
 668         // to avoid churn in the global network graph.
 669         let chan_manager = Arc::clone(&channel_manager);
 670         let network = args.network;
 671         if !args.ldk_announced_listen_addr.is_empty() {
 672                 tokio::spawn(async move {
 673                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 674                         loop {
 675                                 interval.tick().await;
 676                                 chan_manager.broadcast_node_announcement(
 677                                         [0; 3],
 678                                         args.ldk_announced_node_name,
 679                                         args.ldk_announced_listen_addr.clone(),
 680                                 );
 681                         }
 682                 });
 683         }
 684
 685         // Start the CLI.
 686         cli::poll_for_user_input(
 687                 invoice_payer.clone(),
 688                 peer_manager.clone(),
 689                 channel_manager.clone(),
 690                 keys_manager.clone(),
 691                 network_graph.clone(),
 692                 scorer.clone(),
 693                 inbound_payments,
 694                 outbound_payments,
 695                 ldk_data_dir.clone(),
 696                 logger.clone(),
 697                 network,
 698         )
 699         .await;
 700
 701         // Stop the background processor.
 702         background_processor.stop().unwrap();
 703 }
 704
 705 #[tokio::main]
 706 pub async fn main() {
 707         start_ldk().await;
 708 }