_ Git - ldk-sample/blob - src/main.rs

   1 mod args;
   2 pub mod bitcoind_client;
   3 mod cli;
   4 mod convert;
   5 mod disk;
   6 mod hex_utils;
   7
   8 use crate::bitcoind_client::BitcoindClient;
   9 use crate::disk::FilesystemLogger;
  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::keysinterface::{EntropySource, InMemorySigner, KeysManager};
  19 use lightning::chain::{chainmonitor, ChannelMonitorUpdateStatus};
  20 use lightning::chain::{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::onion_message::SimpleArcOnionMessenger;
  28 use lightning::routing::gossip;
  29 use lightning::routing::gossip::{NodeId, P2PGossipSync};
  30 use lightning::routing::router::DefaultRouter;
  31 use lightning::util::config::UserConfig;
  32 use lightning::events::{Event, PaymentPurpose};
  33 use lightning::util::ser::ReadableArgs;
  34 use lightning_background_processor::{process_events_async, GossipSync};
  35 use lightning_block_sync::init;
  36 use lightning_block_sync::poll;
  37 use lightning_block_sync::SpvClient;
  38 use lightning_block_sync::UnboundedCache;
  39 use lightning_net_tokio::SocketDescriptor;
  40 use lightning_persister::FilesystemPersister;
  41 use rand::{thread_rng, Rng};
  42 use std::collections::hash_map::Entry;
  43 use std::collections::HashMap;
  44 use std::convert::TryInto;
  45 use std::fmt;
  46 use std::fs;
  47 use std::fs::File;
  48 use std::io;
  49 use std::io::Write;
  50 use std::path::Path;
  51 use std::sync::atomic::{AtomicBool, Ordering};
  52 use std::sync::{Arc, Mutex};
  53 use std::time::{Duration, SystemTime};
  54
  55 pub(crate) enum HTLCStatus {
  56         Pending,
  57         Succeeded,
  58         Failed,
  59 }
  60
  61 pub(crate) struct MillisatAmount(Option<u64>);
  62
  63 impl fmt::Display for MillisatAmount {
  64         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  65                 match self.0 {
  66                         Some(amt) => write!(f, "{}", amt),
  67                         None => write!(f, "unknown"),
  68                 }
  69         }
  70 }
  71
  72 pub(crate) struct PaymentInfo {
  73         preimage: Option<PaymentPreimage>,
  74         secret: Option<PaymentSecret>,
  75         status: HTLCStatus,
  76         amt_msat: MillisatAmount,
  77 }
  78
  79 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
  80
  81 type ChainMonitor = chainmonitor::ChainMonitor<
  82         InMemorySigner,
  83         Arc<dyn Filter + Send + Sync>,
  84         Arc<BitcoindClient>,
  85         Arc<BitcoindClient>,
  86         Arc<FilesystemLogger>,
  87         Arc<FilesystemPersister>,
  88 >;
  89
  90 pub(crate) type PeerManager = SimpleArcPeerManager<
  91         SocketDescriptor,
  92         ChainMonitor,
  93         BitcoindClient,
  94         BitcoindClient,
  95         BitcoindClient,
  96         FilesystemLogger,
  97 >;
  98
  99 pub(crate) type ChannelManager =
 100         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 101
 102 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 103
 104 type OnionMessenger = SimpleArcOnionMessenger<FilesystemLogger>;
 105
 106 async fn handle_ldk_events(
 107         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 108         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 109         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 110         network: Network, event: Event,
 111 ) {
 112         match event {
 113                 Event::FundingGenerationReady {
 114                         temporary_channel_id,
 115                         counterparty_node_id,
 116                         channel_value_satoshis,
 117                         output_script,
 118                         ..
 119                 } => {
 120                         // Construct the raw transaction with one output, that is paid the amount of the
 121                         // channel.
 122                         let addr = WitnessProgram::from_scriptpubkey(
 123                                 &output_script[..],
 124                                 match network {
 125                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 126                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 127                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 128                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 129                                 },
 130                         )
 131                         .expect("Lightning funding tx should always be to a SegWit output")
 132                         .to_address();
 133                         let mut outputs = vec![HashMap::with_capacity(1)];
 134                         outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
 135                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 136
 137                         // Have your wallet put the inputs into the transaction such that the output is
 138                         // satisfied.
 139                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 140
 141                         // Sign the final funding transaction and broadcast it.
 142                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 143                         assert_eq!(signed_tx.complete, true);
 144                         let final_tx: Transaction =
 145                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 146                         // Give the funding transaction back to LDK for opening the channel.
 147                         if channel_manager
 148                                 .funding_transaction_generated(
 149                                         &temporary_channel_id,
 150                                         &counterparty_node_id,
 151                                         final_tx,
 152                                 )
 153                                 .is_err()
 154                         {
 155                                 println!(
 156                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 157                                 print!("> ");
 158                                 io::stdout().flush().unwrap();
 159                         }
 160                 }
 161                 Event::PaymentClaimable {
 162                         payment_hash,
 163                         purpose,
 164                         amount_msat,
 165                         receiver_node_id: _,
 166                         via_channel_id: _,
 167                         via_user_channel_id: _,
 168                         claim_deadline: _,
 169                         onion_fields: _,
 170                 } => {
 171                         println!(
 172                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 173                                 hex_utils::hex_str(&payment_hash.0),
 174                                 amount_msat,
 175                         );
 176                         print!("> ");
 177                         io::stdout().flush().unwrap();
 178                         let payment_preimage = match purpose {
 179                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => payment_preimage,
 180                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(preimage),
 181                         };
 182                         channel_manager.claim_funds(payment_preimage.unwrap());
 183                 }
 184                 Event::PaymentClaimed { payment_hash, purpose, amount_msat, receiver_node_id: _ } => {
 185                         println!(
 186                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 187                                 hex_utils::hex_str(&payment_hash.0),
 188                                 amount_msat,
 189                         );
 190                         print!("> ");
 191                         io::stdout().flush().unwrap();
 192                         let (payment_preimage, payment_secret) = match purpose {
 193                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 194                                         (payment_preimage, Some(payment_secret))
 195                                 }
 196                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(preimage), None),
 197                         };
 198                         let mut payments = inbound_payments.lock().unwrap();
 199                         match payments.entry(payment_hash) {
 200                                 Entry::Occupied(mut e) => {
 201                                         let payment = e.get_mut();
 202                                         payment.status = HTLCStatus::Succeeded;
 203                                         payment.preimage = payment_preimage;
 204                                         payment.secret = payment_secret;
 205                                 }
 206                                 Entry::Vacant(e) => {
 207                                         e.insert(PaymentInfo {
 208                                                 preimage: payment_preimage,
 209                                                 secret: payment_secret,
 210                                                 status: HTLCStatus::Succeeded,
 211                                                 amt_msat: MillisatAmount(Some(amount_msat)),
 212                                         });
 213                                 }
 214                         }
 215                 }
 216                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 217                         let mut payments = outbound_payments.lock().unwrap();
 218                         for (hash, payment) in payments.iter_mut() {
 219                                 if *hash == payment_hash {
 220                                         payment.preimage = Some(payment_preimage);
 221                                         payment.status = HTLCStatus::Succeeded;
 222                                         println!(
 223                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 224                                                                  payment hash {:?} with preimage {:?}",
 225                                                 payment.amt_msat,
 226                                                 if let Some(fee) = fee_paid_msat {
 227                                                         format!(" (fee {} msat)", fee)
 228                                                 } else {
 229                                                         "".to_string()
 230                                                 },
 231                                                 hex_utils::hex_str(&payment_hash.0),
 232                                                 hex_utils::hex_str(&payment_preimage.0)
 233                                         );
 234                                         print!("> ");
 235                                         io::stdout().flush().unwrap();
 236                                 }
 237                         }
 238                 }
 239                 Event::OpenChannelRequest { .. } => {
 240                         // Unreachable, we don't set manually_accept_inbound_channels
 241                 }
 242                 Event::PaymentPathSuccessful { .. } => {}
 243                 Event::PaymentPathFailed { .. } => {}
 244                 Event::ProbeSuccessful { .. } => {}
 245                 Event::ProbeFailed { .. } => {}
 246                 Event::PaymentFailed { payment_hash, .. } => {
 247                         print!(
 248                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 249                                 hex_utils::hex_str(&payment_hash.0)
 250                         );
 251                         print!("> ");
 252                         io::stdout().flush().unwrap();
 253
 254                         let mut payments = outbound_payments.lock().unwrap();
 255                         if payments.contains_key(&payment_hash) {
 256                                 let payment = payments.get_mut(&payment_hash).unwrap();
 257                                 payment.status = HTLCStatus::Failed;
 258                         }
 259                 }
 260                 Event::PaymentForwarded {
 261                         prev_channel_id,
 262                         next_channel_id,
 263                         fee_earned_msat,
 264                         claim_from_onchain_tx,
 265                         outbound_amount_forwarded_msat,
 266                 } => {
 267                         let read_only_network_graph = network_graph.read_only();
 268                         let nodes = read_only_network_graph.nodes();
 269                         let channels = channel_manager.list_channels();
 270
 271                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 272                                 None => String::new(),
 273                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 274                                         None => String::new(),
 275                                         Some(channel) => {
 276                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 277                                                         None => "private node".to_string(),
 278                                                         Some(node) => match &node.announcement_info {
 279                                                                 None => "unnamed node".to_string(),
 280                                                                 Some(announcement) => {
 281                                                                         format!("node {}", announcement.alias)
 282                                                                 }
 283                                                         },
 284                                                 }
 285                                         }
 286                                 },
 287                         };
 288                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 289                                 channel_id
 290                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 291                                         .unwrap_or_default()
 292                         };
 293                         let from_prev_str =
 294                                 format!(" from {}{}", node_str(&prev_channel_id), channel_str(&prev_channel_id));
 295                         let to_next_str =
 296                                 format!(" to {}{}", node_str(&next_channel_id), channel_str(&next_channel_id));
 297
 298                         let from_onchain_str = if claim_from_onchain_tx {
 299                                 "from onchain downstream claim"
 300                         } else {
 301                                 "from HTLC fulfill message"
 302                         };
 303                         let amt_args = if let Some(v) = outbound_amount_forwarded_msat {
 304                                 format!("{}", v)
 305                         } else {
 306                                 "?".to_string()
 307                         };
 308                         if let Some(fee_earned) = fee_earned_msat {
 309                                 println!(
 310                                         "\nEVENT: Forwarded payment for {} msat{}{}, earning {} msat {}",
 311                                         amt_args, from_prev_str, to_next_str, fee_earned, from_onchain_str
 312                                 );
 313                         } else {
 314                                 println!(
 315                                         "\nEVENT: Forwarded payment for {} msat{}{}, claiming onchain {}",
 316                                         amt_args, from_prev_str, to_next_str, from_onchain_str
 317                                 );
 318                         }
 319                         print!("> ");
 320                         io::stdout().flush().unwrap();
 321                 }
 322                 Event::HTLCHandlingFailed { .. } => {}
 323                 Event::PendingHTLCsForwardable { time_forwardable } => {
 324                         let forwarding_channel_manager = channel_manager.clone();
 325                         let min = time_forwardable.as_millis() as u64;
 326                         tokio::spawn(async move {
 327                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 328                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 329                                 forwarding_channel_manager.process_pending_htlc_forwards();
 330                         });
 331                 }
 332                 Event::SpendableOutputs { outputs } => {
 333                         let destination_address = bitcoind_client.get_new_address().await;
 334                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 335                         let tx_feerate =
 336                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 337                         let spending_tx = keys_manager
 338                                 .spend_spendable_outputs(
 339                                         output_descriptors,
 340                                         Vec::new(),
 341                                         destination_address.script_pubkey(),
 342                                         tx_feerate,
 343                                         &Secp256k1::new(),
 344                                 )
 345                                 .unwrap();
 346                         bitcoind_client.broadcast_transaction(&spending_tx);
 347                 }
 348                 Event::ChannelPending { .. } => {}
 349                 Event::ChannelReady {
 350                         ref channel_id,
 351                         user_channel_id: _,
 352                         ref counterparty_node_id,
 353                         channel_type: _,
 354                 } => {
 355                         println!(
 356                                 "\nEVENT: Channel {} with peer {} is ready to be used!",
 357                                 hex_utils::hex_str(channel_id),
 358                                 hex_utils::hex_str(&counterparty_node_id.serialize()),
 359                         );
 360                         print!("> ");
 361                         io::stdout().flush().unwrap();
 362                 }
 363                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 364                         println!(
 365                                 "\nEVENT: Channel {} closed due to: {:?}",
 366                                 hex_utils::hex_str(&channel_id),
 367                                 reason
 368                         );
 369                         print!("> ");
 370                         io::stdout().flush().unwrap();
 371                 }
 372                 Event::DiscardFunding { .. } => {
 373                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 374                         // the funding transaction either confirms, or this event is generated.
 375                 }
 376                 Event::HTLCIntercepted { .. } => {}
 377         }
 378 }
 379
 380 async fn start_ldk() {
 381         let args = match args::parse_startup_args() {
 382                 Ok(user_args) => user_args,
 383                 Err(()) => return,
 384         };
 385
 386         // Initialize the LDK data directory if necessary.
 387         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 388         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 389
 390         // ## Setup
 391         // Step 1: Initialize the Logger
 392         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 393
 394         // Initialize our bitcoind client.
 395         let bitcoind_client = match BitcoindClient::new(
 396                 args.bitcoind_rpc_host.clone(),
 397                 args.bitcoind_rpc_port,
 398                 args.bitcoind_rpc_username.clone(),
 399                 args.bitcoind_rpc_password.clone(),
 400                 tokio::runtime::Handle::current(),
 401                 Arc::clone(&logger),
 402         )
 403         .await
 404         {
 405                 Ok(client) => Arc::new(client),
 406                 Err(e) => {
 407                         println!("Failed to connect to bitcoind client: {}", e);
 408                         return;
 409                 }
 410         };
 411
 412         // Check that the bitcoind we've connected to is running the network we expect
 413         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 414         if bitcoind_chain
 415                 != match args.network {
 416                         bitcoin::Network::Bitcoin => "main",
 417                         bitcoin::Network::Testnet => "test",
 418                         bitcoin::Network::Regtest => "regtest",
 419                         bitcoin::Network::Signet => "signet",
 420                 } {
 421                 println!(
 422                         "Chain argument ({}) didn't match bitcoind chain ({})",
 423                         args.network, bitcoind_chain
 424                 );
 425                 return;
 426         }
 427
 428         // Step 2: Initialize the FeeEstimator
 429
 430         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 431         let fee_estimator = bitcoind_client.clone();
 432
 433         // Step 3: Initialize the BroadcasterInterface
 434
 435         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 436         // broadcaster.
 437         let broadcaster = bitcoind_client.clone();
 438
 439         // Step 4: Initialize Persist
 440         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 441
 442         // Step 5: Initialize the ChainMonitor
 443         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 444                 None,
 445                 broadcaster.clone(),
 446                 logger.clone(),
 447                 fee_estimator.clone(),
 448                 persister.clone(),
 449         ));
 450
 451         // Step 6: Initialize the KeysManager
 452
 453         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 454         // other secret key material.
 455         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 456         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 457                 assert_eq!(seed.len(), 32);
 458                 let mut key = [0; 32];
 459                 key.copy_from_slice(&seed);
 460                 key
 461         } else {
 462                 let mut key = [0; 32];
 463                 thread_rng().fill_bytes(&mut key);
 464                 match File::create(keys_seed_path.clone()) {
 465                         Ok(mut f) => {
 466                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 467                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 468                         }
 469                         Err(e) => {
 470                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 471                                 return;
 472                         }
 473                 }
 474                 key
 475         };
 476         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 477         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 478
 479         // Step 7: Read ChannelMonitor state from disk
 480         let mut channelmonitors =
 481                 persister.read_channelmonitors(keys_manager.clone(), keys_manager.clone()).unwrap();
 482
 483         // Step 8: Poll for the best chain tip, which may be used by the channel manager & spv client
 484         let polled_chain_tip = init::validate_best_block_header(bitcoind_client.as_ref())
 485                 .await
 486                 .expect("Failed to fetch best block header and best block");
 487
 488         // Step 9: Initialize routing ProbabilisticScorer
 489         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 490         let network_graph =
 491                 Arc::new(disk::read_network(Path::new(&network_graph_path), args.network, logger.clone()));
 492
 493         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 494         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 495                 Path::new(&scorer_path),
 496                 Arc::clone(&network_graph),
 497                 Arc::clone(&logger),
 498         )));
 499
 500         // Step 10: Create Router
 501         let router = Arc::new(DefaultRouter::new(
 502                 network_graph.clone(),
 503                 logger.clone(),
 504                 keys_manager.get_secure_random_bytes(),
 505                 scorer.clone(),
 506         ));
 507
 508         // Step 11: Initialize the ChannelManager
 509         let mut user_config = UserConfig::default();
 510         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 511         let mut restarting_node = true;
 512         let (channel_manager_blockhash, channel_manager) = {
 513                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 514                         let mut channel_monitor_mut_references = Vec::new();
 515                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 516                                 channel_monitor_mut_references.push(channel_monitor);
 517                         }
 518                         let read_args = ChannelManagerReadArgs::new(
 519                                 keys_manager.clone(),
 520                                 keys_manager.clone(),
 521                                 keys_manager.clone(),
 522                                 fee_estimator.clone(),
 523                                 chain_monitor.clone(),
 524                                 broadcaster.clone(),
 525                                 router,
 526                                 logger.clone(),
 527                                 user_config,
 528                                 channel_monitor_mut_references,
 529                         );
 530                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 531                 } else {
 532                         // We're starting a fresh node.
 533                         restarting_node = false;
 534
 535                         let polled_best_block = polled_chain_tip.to_best_block();
 536                         let polled_best_block_hash = polled_best_block.block_hash();
 537                         let chain_params =
 538                                 ChainParameters { network: args.network, best_block: polled_best_block };
 539                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 540                                 fee_estimator.clone(),
 541                                 chain_monitor.clone(),
 542                                 broadcaster.clone(),
 543                                 router,
 544                                 logger.clone(),
 545                                 keys_manager.clone(),
 546                                 keys_manager.clone(),
 547                                 keys_manager.clone(),
 548                                 user_config,
 549                                 chain_params,
 550                         );
 551                         (polled_best_block_hash, fresh_channel_manager)
 552                 }
 553         };
 554
 555         // Step 12: Sync ChannelMonitors and ChannelManager to chain tip
 556         let mut chain_listener_channel_monitors = Vec::new();
 557         let mut cache = UnboundedCache::new();
 558         let chain_tip = if restarting_node {
 559                 let mut chain_listeners = vec![(
 560                         channel_manager_blockhash,
 561                         &channel_manager as &(dyn chain::Listen + Send + Sync),
 562                 )];
 563
 564                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 565                         let outpoint = channel_monitor.get_funding_txo().0;
 566                         chain_listener_channel_monitors.push((
 567                                 blockhash,
 568                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 569                                 outpoint,
 570                         ));
 571                 }
 572
 573                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 574                         chain_listeners.push((
 575                                 monitor_listener_info.0,
 576                                 &monitor_listener_info.1 as &(dyn chain::Listen + Send + Sync),
 577                         ));
 578                 }
 579
 580                 init::synchronize_listeners(
 581                         bitcoind_client.as_ref(),
 582                         args.network,
 583                         &mut cache,
 584                         chain_listeners,
 585                 )
 586                 .await
 587                 .unwrap()
 588         } else {
 589                 polled_chain_tip
 590         };
 591
 592         // Step 13: Give ChannelMonitors to ChainMonitor
 593         for item in chain_listener_channel_monitors.drain(..) {
 594                 let channel_monitor = item.1 .0;
 595                 let funding_outpoint = item.2;
 596                 assert_eq!(
 597                         chain_monitor.watch_channel(funding_outpoint, channel_monitor),
 598                         ChannelMonitorUpdateStatus::Completed
 599                 );
 600         }
 601
 602         // Step 14: Optional: Initialize the P2PGossipSync
 603         let gossip_sync = Arc::new(P2PGossipSync::new(
 604                 Arc::clone(&network_graph),
 605                 None::<Arc<BitcoindClient>>,
 606                 logger.clone(),
 607         ));
 608
 609         // Step 15: Initialize the PeerManager
 610         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 611         let onion_messenger: Arc<OnionMessenger> = Arc::new(OnionMessenger::new(
 612                 Arc::clone(&keys_manager),
 613                 Arc::clone(&keys_manager),
 614                 Arc::clone(&logger),
 615                 IgnoringMessageHandler {},
 616         ));
 617         let mut ephemeral_bytes = [0; 32];
 618         let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 619         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 620         let lightning_msg_handler = MessageHandler {
 621                 chan_handler: channel_manager.clone(),
 622                 route_handler: gossip_sync.clone(),
 623                 onion_message_handler: onion_messenger.clone(),
 624         };
 625         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 626                 lightning_msg_handler,
 627                 current_time.try_into().unwrap(),
 628                 &ephemeral_bytes,
 629                 logger.clone(),
 630                 IgnoringMessageHandler {},
 631                 Arc::clone(&keys_manager),
 632         ));
 633
 634         // ## Running LDK
 635         // Step 16: Initialize networking
 636
 637         let peer_manager_connection_handler = peer_manager.clone();
 638         let listening_port = args.ldk_peer_listening_port;
 639         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 640         let stop_listen = Arc::clone(&stop_listen_connect);
 641         tokio::spawn(async move {
 642                 let listener = tokio::net::TcpListener::bind(format!("[::]:{}", listening_port))
 643                         .await
 644                         .expect("Failed to bind to listen port - is something else already listening on it?");
 645                 loop {
 646                         let peer_mgr = peer_manager_connection_handler.clone();
 647                         let tcp_stream = listener.accept().await.unwrap().0;
 648                         if stop_listen.load(Ordering::Acquire) {
 649                                 return;
 650                         }
 651                         tokio::spawn(async move {
 652                                 lightning_net_tokio::setup_inbound(
 653                                         peer_mgr.clone(),
 654                                         tcp_stream.into_std().unwrap(),
 655                                 )
 656                                 .await;
 657                         });
 658                 }
 659         });
 660
 661         // Step 17: Connect and Disconnect Blocks
 662         let channel_manager_listener = channel_manager.clone();
 663         let chain_monitor_listener = chain_monitor.clone();
 664         let bitcoind_block_source = bitcoind_client.clone();
 665         let network = args.network;
 666         tokio::spawn(async move {
 667                 let chain_poller = poll::ChainPoller::new(bitcoind_block_source.as_ref(), network);
 668                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 669                 let mut spv_client = SpvClient::new(chain_tip, chain_poller, &mut cache, &chain_listener);
 670                 loop {
 671                         spv_client.poll_best_tip().await.unwrap();
 672                         tokio::time::sleep(Duration::from_secs(1)).await;
 673                 }
 674         });
 675
 676         // TODO: persist payment info to disk
 677         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 678         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 679
 680         // Step 18: Handle LDK Events
 681         let channel_manager_event_listener = Arc::clone(&channel_manager);
 682         let bitcoind_client_event_listener = Arc::clone(&bitcoind_client);
 683         let network_graph_event_listener = Arc::clone(&network_graph);
 684         let keys_manager_event_listener = Arc::clone(&keys_manager);
 685         let inbound_payments_event_listener = Arc::clone(&inbound_payments);
 686         let outbound_payments_event_listener = Arc::clone(&outbound_payments);
 687         let network = args.network;
 688         let event_handler = move |event: Event| {
 689                 let channel_manager_event_listener = Arc::clone(&channel_manager_event_listener);
 690                 let bitcoind_client_event_listener = Arc::clone(&bitcoind_client_event_listener);
 691                 let network_graph_event_listener = Arc::clone(&network_graph_event_listener);
 692                 let keys_manager_event_listener = Arc::clone(&keys_manager_event_listener);
 693                 let inbound_payments_event_listener = Arc::clone(&inbound_payments_event_listener);
 694                 let outbound_payments_event_listener = Arc::clone(&outbound_payments_event_listener);
 695                 async move {
 696                         handle_ldk_events(
 697                                 &channel_manager_event_listener,
 698                                 &bitcoind_client_event_listener,
 699                                 &network_graph_event_listener,
 700                                 &keys_manager_event_listener,
 701                                 &inbound_payments_event_listener,
 702                                 &outbound_payments_event_listener,
 703                                 network,
 704                                 event,
 705                         )
 706                         .await;
 707                 }
 708         };
 709
 710         // Step 19: Persist ChannelManager and NetworkGraph
 711         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 712
 713         // Step 20: Background Processing
 714         let (bp_exit, bp_exit_check) = tokio::sync::watch::channel(());
 715         let background_processor = tokio::spawn(process_events_async(
 716                 persister,
 717                 event_handler,
 718                 chain_monitor.clone(),
 719                 channel_manager.clone(),
 720                 GossipSync::p2p(gossip_sync.clone()),
 721                 peer_manager.clone(),
 722                 logger.clone(),
 723                 Some(scorer.clone()),
 724                 move |t| {
 725                         let mut bp_exit_fut_check = bp_exit_check.clone();
 726                         Box::pin(async move {
 727                                 tokio::select! {
 728                                         _ = tokio::time::sleep(t) => false,
 729                                         _ = bp_exit_fut_check.changed() => true,
 730                                 }
 731                         })
 732                 },
 733                 false,
 734         ));
 735
 736         // Regularly reconnect to channel peers.
 737         let connect_cm = Arc::clone(&channel_manager);
 738         let connect_pm = Arc::clone(&peer_manager);
 739         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 740         let stop_connect = Arc::clone(&stop_listen_connect);
 741         tokio::spawn(async move {
 742                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 743                 loop {
 744                         interval.tick().await;
 745                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 746                                 Ok(info) => {
 747                                         let peers = connect_pm.get_peer_node_ids();
 748                                         for node_id in connect_cm
 749                                                 .list_channels()
 750                                                 .iter()
 751                                                 .map(|chan| chan.counterparty.node_id)
 752                                                 .filter(|id| !peers.iter().any(|(pk, _)| id == pk))
 753                                         {
 754                                                 if stop_connect.load(Ordering::Acquire) {
 755                                                         return;
 756                                                 }
 757                                                 for (pubkey, peer_addr) in info.iter() {
 758                                                         if *pubkey == node_id {
 759                                                                 let _ = cli::do_connect_peer(
 760                                                                         *pubkey,
 761                                                                         peer_addr.clone(),
 762                                                                         Arc::clone(&connect_pm),
 763                                                                 )
 764                                                                 .await;
 765                                                         }
 766                                                 }
 767                                         }
 768                                 }
 769                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 770                         }
 771                 }
 772         });
 773
 774         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 775         // some public channels, and is only useful if we have public listen address(es) to announce.
 776         // In a production environment, this should occur only after the announcement of new channels
 777         // to avoid churn in the global network graph.
 778         let peer_man = Arc::clone(&peer_manager);
 779         let network = args.network;
 780         if !args.ldk_announced_listen_addr.is_empty() {
 781                 tokio::spawn(async move {
 782                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 783                         loop {
 784                                 interval.tick().await;
 785                                 peer_man.broadcast_node_announcement(
 786                                         [0; 3],
 787                                         args.ldk_announced_node_name,
 788                                         args.ldk_announced_listen_addr.clone(),
 789                                 );
 790                         }
 791                 });
 792         }
 793
 794         // Start the CLI.
 795         cli::poll_for_user_input(
 796                 Arc::clone(&peer_manager),
 797                 Arc::clone(&channel_manager),
 798                 Arc::clone(&keys_manager),
 799                 Arc::clone(&network_graph),
 800                 Arc::clone(&onion_messenger),
 801                 inbound_payments,
 802                 outbound_payments,
 803                 ldk_data_dir.clone(),
 804                 network,
 805                 Arc::clone(&logger),
 806         )
 807         .await;
 808
 809         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 810         // updating our channel data after we've stopped the background processor.
 811         stop_listen_connect.store(true, Ordering::Release);
 812         peer_manager.disconnect_all_peers();
 813
 814         // Stop the background processor.
 815         bp_exit.send(()).unwrap();
 816         background_processor.await.unwrap().unwrap();
 817 }
 818
 819 #[tokio::main]
 820 pub async fn main() {
 821         #[cfg(not(target_os = "windows"))]
 822         {
 823                 // Catch Ctrl-C with a dummy signal handler.
 824                 unsafe {
 825                         let mut new_action: libc::sigaction = core::mem::zeroed();
 826                         let mut old_action: libc::sigaction = core::mem::zeroed();
 827
 828                         extern "C" fn dummy_handler(
 829                                 _: libc::c_int, _: *const libc::siginfo_t, _: *const libc::c_void,
 830                         ) {
 831                         }
 832
 833                         new_action.sa_sigaction = dummy_handler as libc::sighandler_t;
 834                         new_action.sa_flags = libc::SA_SIGINFO;
 835
 836                         libc::sigaction(
 837                                 libc::SIGINT,
 838                                 &new_action as *const libc::sigaction,
 839                                 &mut old_action as *mut libc::sigaction,
 840                         );
 841                 }
 842         }
 843
 844         start_ldk().await;
 845 }