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