_ 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::constants::genesis_block;
  11 use bitcoin::blockdata::transaction::Transaction;
  12 use bitcoin::consensus::encode;
  13 use bitcoin::network::constants::Network;
  14 use bitcoin::secp256k1::Secp256k1;
  15 use bitcoin::BlockHash;
  16 use bitcoin_bech32::WitnessProgram;
  17 use lightning::chain;
  18 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  19 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager, Recipient};
  20 use lightning::chain::{chainmonitor, ChannelMonitorUpdateStatus};
  21 use lightning::chain::{Filter, Watch};
  22 use lightning::ln::channelmanager;
  23 use lightning::ln::channelmanager::{
  24         ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
  25 };
  26 use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler, SimpleArcPeerManager};
  27 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
  28 use lightning::onion_message::SimpleArcOnionMessenger;
  29 use lightning::routing::gossip;
  30 use lightning::routing::gossip::{NodeId, P2PGossipSync};
  31 use lightning::routing::router::DefaultRouter;
  32 use lightning::routing::scoring::ProbabilisticScorer;
  33 use lightning::util::config::UserConfig;
  34 use lightning::util::events::{Event, PaymentPurpose};
  35 use lightning::util::ser::ReadableArgs;
  36 use lightning_background_processor::{BackgroundProcessor, GossipSync};
  37 use lightning_block_sync::init;
  38 use lightning_block_sync::poll;
  39 use lightning_block_sync::SpvClient;
  40 use lightning_block_sync::UnboundedCache;
  41 use lightning_invoice::payment;
  42 use lightning_net_tokio::SocketDescriptor;
  43 use lightning_persister::FilesystemPersister;
  44 use rand::{thread_rng, Rng};
  45 use std::collections::hash_map::Entry;
  46 use std::collections::HashMap;
  47 use std::convert::TryInto;
  48 use std::fmt;
  49 use std::fs;
  50 use std::fs::File;
  51 use std::io;
  52 use std::io::Write;
  53 use std::path::Path;
  54 use std::sync::atomic::{AtomicBool, Ordering};
  55 use std::sync::{Arc, Mutex};
  56 use std::time::{Duration, SystemTime};
  57
  58 pub(crate) enum HTLCStatus {
  59         Pending,
  60         Succeeded,
  61         Failed,
  62 }
  63
  64 pub(crate) struct MillisatAmount(Option<u64>);
  65
  66 impl fmt::Display for MillisatAmount {
  67         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  68                 match self.0 {
  69                         Some(amt) => write!(f, "{}", amt),
  70                         None => write!(f, "unknown"),
  71                 }
  72         }
  73 }
  74
  75 pub(crate) struct PaymentInfo {
  76         preimage: Option<PaymentPreimage>,
  77         secret: Option<PaymentSecret>,
  78         status: HTLCStatus,
  79         amt_msat: MillisatAmount,
  80 }
  81
  82 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
  83
  84 type ChainMonitor = chainmonitor::ChainMonitor<
  85         InMemorySigner,
  86         Arc<dyn Filter + Send + Sync>,
  87         Arc<BitcoindClient>,
  88         Arc<BitcoindClient>,
  89         Arc<FilesystemLogger>,
  90         Arc<FilesystemPersister>,
  91 >;
  92
  93 pub(crate) type PeerManager = SimpleArcPeerManager<
  94         SocketDescriptor,
  95         ChainMonitor,
  96         BitcoindClient,
  97         BitcoindClient,
  98         dyn chain::Access + Send + Sync,
  99         FilesystemLogger,
 100 >;
 101
 102 pub(crate) type ChannelManager =
 103         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 104
 105 pub(crate) type InvoicePayer<E> =
 106         payment::InvoicePayer<Arc<ChannelManager>, Router, Arc<FilesystemLogger>, E>;
 107
 108 type Router = DefaultRouter<
 109         Arc<NetworkGraph>,
 110         Arc<FilesystemLogger>,
 111         Arc<Mutex<ProbabilisticScorer<Arc<NetworkGraph>, Arc<FilesystemLogger>>>>,
 112 >;
 113
 114 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 115
 116 type OnionMessenger = SimpleArcOnionMessenger<FilesystemLogger>;
 117
 118 async fn handle_ldk_events(
 119         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 120         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 121         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 122         network: Network, event: &Event,
 123 ) {
 124         match event {
 125                 Event::FundingGenerationReady {
 126                         temporary_channel_id,
 127                         counterparty_node_id,
 128                         channel_value_satoshis,
 129                         output_script,
 130                         ..
 131                 } => {
 132                         // Construct the raw transaction with one output, that is paid the amount of the
 133                         // channel.
 134                         let addr = WitnessProgram::from_scriptpubkey(
 135                                 &output_script[..],
 136                                 match network {
 137                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 138                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 139                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 140                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 141                                 },
 142                         )
 143                         .expect("Lightning funding tx should always be to a SegWit output")
 144                         .to_address();
 145                         let mut outputs = vec![HashMap::with_capacity(1)];
 146                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 147                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 148
 149                         // Have your wallet put the inputs into the transaction such that the output is
 150                         // satisfied.
 151                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 152
 153                         // Sign the final funding transaction and broadcast it.
 154                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 155                         assert_eq!(signed_tx.complete, true);
 156                         let final_tx: Transaction =
 157                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 158                         // Give the funding transaction back to LDK for opening the channel.
 159                         if channel_manager
 160                                 .funding_transaction_generated(
 161                                         &temporary_channel_id,
 162                                         counterparty_node_id,
 163                                         final_tx,
 164                                 )
 165                                 .is_err()
 166                         {
 167                                 println!(
 168                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 169                                 print!("> ");
 170                                 io::stdout().flush().unwrap();
 171                         }
 172                 }
 173                 Event::PaymentClaimable {
 174                         payment_hash,
 175                         purpose,
 176                         amount_msat,
 177                         receiver_node_id: _,
 178                         via_channel_id: _,
 179                         via_user_channel_id: _,
 180                 } => {
 181                         println!(
 182                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 183                                 hex_utils::hex_str(&payment_hash.0),
 184                                 amount_msat,
 185                         );
 186                         print!("> ");
 187                         io::stdout().flush().unwrap();
 188                         let payment_preimage = match purpose {
 189                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 190                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 191                         };
 192                         channel_manager.claim_funds(payment_preimage.unwrap());
 193                 }
 194                 Event::PaymentClaimed { payment_hash, purpose, amount_msat, receiver_node_id: _ } => {
 195                         println!(
 196                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 197                                 hex_utils::hex_str(&payment_hash.0),
 198                                 amount_msat,
 199                         );
 200                         print!("> ");
 201                         io::stdout().flush().unwrap();
 202                         let (payment_preimage, payment_secret) = match purpose {
 203                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 204                                         (*payment_preimage, Some(*payment_secret))
 205                                 }
 206                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 207                         };
 208                         let mut payments = inbound_payments.lock().unwrap();
 209                         match payments.entry(*payment_hash) {
 210                                 Entry::Occupied(mut e) => {
 211                                         let payment = e.get_mut();
 212                                         payment.status = HTLCStatus::Succeeded;
 213                                         payment.preimage = payment_preimage;
 214                                         payment.secret = payment_secret;
 215                                 }
 216                                 Entry::Vacant(e) => {
 217                                         e.insert(PaymentInfo {
 218                                                 preimage: payment_preimage,
 219                                                 secret: payment_secret,
 220                                                 status: HTLCStatus::Succeeded,
 221                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 222                                         });
 223                                 }
 224                         }
 225                 }
 226                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 227                         let mut payments = outbound_payments.lock().unwrap();
 228                         for (hash, payment) in payments.iter_mut() {
 229                                 if *hash == *payment_hash {
 230                                         payment.preimage = Some(*payment_preimage);
 231                                         payment.status = HTLCStatus::Succeeded;
 232                                         println!(
 233                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 234                                                                  payment hash {:?} with preimage {:?}",
 235                                                 payment.amt_msat,
 236                                                 if let Some(fee) = fee_paid_msat {
 237                                                         format!(" (fee {} msat)", fee)
 238                                                 } else {
 239                                                         "".to_string()
 240                                                 },
 241                                                 hex_utils::hex_str(&payment_hash.0),
 242                                                 hex_utils::hex_str(&payment_preimage.0)
 243                                         );
 244                                         print!("> ");
 245                                         io::stdout().flush().unwrap();
 246                                 }
 247                         }
 248                 }
 249                 Event::OpenChannelRequest { .. } => {
 250                         // Unreachable, we don't set manually_accept_inbound_channels
 251                 }
 252                 Event::PaymentPathSuccessful { .. } => {}
 253                 Event::PaymentPathFailed { .. } => {}
 254                 Event::ProbeSuccessful { .. } => {}
 255                 Event::ProbeFailed { .. } => {}
 256                 Event::PaymentFailed { payment_hash, .. } => {
 257                         print!(
 258                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 259                                 hex_utils::hex_str(&payment_hash.0)
 260                         );
 261                         print!("> ");
 262                         io::stdout().flush().unwrap();
 263
 264                         let mut payments = outbound_payments.lock().unwrap();
 265                         if payments.contains_key(&payment_hash) {
 266                                 let payment = payments.get_mut(&payment_hash).unwrap();
 267                                 payment.status = HTLCStatus::Failed;
 268                         }
 269                 }
 270                 Event::PaymentForwarded {
 271                         prev_channel_id,
 272                         next_channel_id,
 273                         fee_earned_msat,
 274                         claim_from_onchain_tx,
 275                 } => {
 276                         let read_only_network_graph = network_graph.read_only();
 277                         let nodes = read_only_network_graph.nodes();
 278                         let channels = channel_manager.list_channels();
 279
 280                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 281                                 None => String::new(),
 282                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 283                                         None => String::new(),
 284                                         Some(channel) => {
 285                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 286                                                         None => "private node".to_string(),
 287                                                         Some(node) => match &node.announcement_info {
 288                                                                 None => "unnamed node".to_string(),
 289                                                                 Some(announcement) => {
 290                                                                         format!("node {}", announcement.alias)
 291                                                                 }
 292                                                         },
 293                                                 }
 294                                         }
 295                                 },
 296                         };
 297                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 298                                 channel_id
 299                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 300                                         .unwrap_or_default()
 301                         };
 302                         let from_prev_str =
 303                                 format!(" from {}{}", node_str(prev_channel_id), channel_str(prev_channel_id));
 304                         let to_next_str =
 305                                 format!(" to {}{}", node_str(next_channel_id), channel_str(next_channel_id));
 306
 307                         let from_onchain_str = if *claim_from_onchain_tx {
 308                                 "from onchain downstream claim"
 309                         } else {
 310                                 "from HTLC fulfill message"
 311                         };
 312                         if let Some(fee_earned) = fee_earned_msat {
 313                                 println!(
 314                                         "\nEVENT: Forwarded payment{}{}, earning {} msat {}",
 315                                         from_prev_str, to_next_str, fee_earned, from_onchain_str
 316                                 );
 317                         } else {
 318                                 println!(
 319                                         "\nEVENT: Forwarded payment{}{}, claiming onchain {}",
 320                                         from_prev_str, to_next_str, from_onchain_str
 321                                 );
 322                         }
 323                         print!("> ");
 324                         io::stdout().flush().unwrap();
 325                 }
 326                 Event::HTLCHandlingFailed { .. } => {}
 327                 Event::PendingHTLCsForwardable { time_forwardable } => {
 328                         let forwarding_channel_manager = channel_manager.clone();
 329                         let min = time_forwardable.as_millis() as u64;
 330                         tokio::spawn(async move {
 331                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 332                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 333                                 forwarding_channel_manager.process_pending_htlc_forwards();
 334                         });
 335                 }
 336                 Event::SpendableOutputs { outputs } => {
 337                         let destination_address = bitcoind_client.get_new_address().await;
 338                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 339                         let tx_feerate =
 340                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 341                         let spending_tx = keys_manager
 342                                 .spend_spendable_outputs(
 343                                         output_descriptors,
 344                                         Vec::new(),
 345                                         destination_address.script_pubkey(),
 346                                         tx_feerate,
 347                                         &Secp256k1::new(),
 348                                 )
 349                                 .unwrap();
 350                         bitcoind_client.broadcast_transaction(&spending_tx);
 351                 }
 352                 Event::ChannelReady {
 353                         ref channel_id,
 354                         user_channel_id: _,
 355                         ref counterparty_node_id,
 356                         channel_type: _,
 357                 } => {
 358                         println!(
 359                                 "\nEVENT: Channel {} with peer {} is ready to be used!",
 360                                 hex_utils::hex_str(channel_id),
 361                                 hex_utils::hex_str(&counterparty_node_id.serialize()),
 362                         );
 363                         print!("> ");
 364                         io::stdout().flush().unwrap();
 365                 }
 366                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 367                         println!(
 368                                 "\nEVENT: Channel {} closed due to: {:?}",
 369                                 hex_utils::hex_str(channel_id),
 370                                 reason
 371                         );
 372                         print!("> ");
 373                         io::stdout().flush().unwrap();
 374                 }
 375                 Event::DiscardFunding { .. } => {
 376                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 377                         // the funding transaction either confirms, or this event is generated.
 378                 }
 379                 Event::HTLCIntercepted { .. } => {}
 380         }
 381 }
 382
 383 async fn start_ldk() {
 384         let args = match args::parse_startup_args() {
 385                 Ok(user_args) => user_args,
 386                 Err(()) => return,
 387         };
 388
 389         // Initialize the LDK data directory if necessary.
 390         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 391         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 392
 393         // Initialize our bitcoind client.
 394         let bitcoind_client = match BitcoindClient::new(
 395                 args.bitcoind_rpc_host.clone(),
 396                 args.bitcoind_rpc_port,
 397                 args.bitcoind_rpc_username.clone(),
 398                 args.bitcoind_rpc_password.clone(),
 399                 tokio::runtime::Handle::current(),
 400         )
 401         .await
 402         {
 403                 Ok(client) => Arc::new(client),
 404                 Err(e) => {
 405                         println!("Failed to connect to bitcoind client: {}", e);
 406                         return;
 407                 }
 408         };
 409
 410         // Check that the bitcoind we've connected to is running the network we expect
 411         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 412         if bitcoind_chain
 413                 != match args.network {
 414                         bitcoin::Network::Bitcoin => "main",
 415                         bitcoin::Network::Testnet => "test",
 416                         bitcoin::Network::Regtest => "regtest",
 417                         bitcoin::Network::Signet => "signet",
 418                 } {
 419                 println!(
 420                         "Chain argument ({}) didn't match bitcoind chain ({})",
 421                         args.network, bitcoind_chain
 422                 );
 423                 return;
 424         }
 425
 426         // ## Setup
 427         // Step 1: Initialize the FeeEstimator
 428
 429         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 430         let fee_estimator = bitcoind_client.clone();
 431
 432         // Step 2: Initialize the Logger
 433         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 434
 435         // Step 3: Initialize the BroadcasterInterface
 436
 437         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 438         // broadcaster.
 439         let broadcaster = bitcoind_client.clone();
 440
 441         // Step 4: Initialize Persist
 442         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 443
 444         // Step 5: Initialize the ChainMonitor
 445         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 446                 None,
 447                 broadcaster.clone(),
 448                 logger.clone(),
 449                 fee_estimator.clone(),
 450                 persister.clone(),
 451         ));
 452
 453         // Step 6: Initialize the KeysManager
 454
 455         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 456         // other secret key material.
 457         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 458         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 459                 assert_eq!(seed.len(), 32);
 460                 let mut key = [0; 32];
 461                 key.copy_from_slice(&seed);
 462                 key
 463         } else {
 464                 let mut key = [0; 32];
 465                 thread_rng().fill_bytes(&mut key);
 466                 match File::create(keys_seed_path.clone()) {
 467                         Ok(mut f) => {
 468                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 469                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 470                         }
 471                         Err(e) => {
 472                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 473                                 return;
 474                         }
 475                 }
 476                 key
 477         };
 478         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 479         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 480
 481         // Step 7: Read ChannelMonitor state from disk
 482         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 483
 484         // Step 8: Poll for the best chain tip, which may be used by the channel manager & spv client
 485         let polled_chain_tip = init::validate_best_block_header(bitcoind_client.as_ref())
 486                 .await
 487                 .expect("Failed to fetch best block header and best block");
 488
 489         // Step 9: Initialize the ChannelManager
 490         let mut user_config = UserConfig::default();
 491         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 492         let mut restarting_node = true;
 493         let (channel_manager_blockhash, channel_manager) = {
 494                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 495                         let mut channel_monitor_mut_references = Vec::new();
 496                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 497                                 channel_monitor_mut_references.push(channel_monitor);
 498                         }
 499                         let read_args = ChannelManagerReadArgs::new(
 500                                 keys_manager.clone(),
 501                                 fee_estimator.clone(),
 502                                 chain_monitor.clone(),
 503                                 broadcaster.clone(),
 504                                 logger.clone(),
 505                                 user_config,
 506                                 channel_monitor_mut_references,
 507                         );
 508                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 509                 } else {
 510                         // We're starting a fresh node.
 511                         restarting_node = false;
 512
 513                         let polled_best_block = polled_chain_tip.to_best_block();
 514                         let polled_best_block_hash = polled_best_block.block_hash();
 515                         let chain_params =
 516                                 ChainParameters { network: args.network, best_block: polled_best_block };
 517                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 518                                 fee_estimator.clone(),
 519                                 chain_monitor.clone(),
 520                                 broadcaster.clone(),
 521                                 logger.clone(),
 522                                 keys_manager.clone(),
 523                                 user_config,
 524                                 chain_params,
 525                         );
 526                         (polled_best_block_hash, fresh_channel_manager)
 527                 }
 528         };
 529
 530         // Step 10: Sync ChannelMonitors and ChannelManager to chain tip
 531         let mut chain_listener_channel_monitors = Vec::new();
 532         let mut cache = UnboundedCache::new();
 533         let chain_tip = if restarting_node {
 534                 let mut chain_listeners = vec![(
 535                         channel_manager_blockhash,
 536                         &channel_manager as &(dyn chain::Listen + Send + Sync),
 537                 )];
 538
 539                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 540                         let outpoint = channel_monitor.get_funding_txo().0;
 541                         chain_listener_channel_monitors.push((
 542                                 blockhash,
 543                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 544                                 outpoint,
 545                         ));
 546                 }
 547
 548                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 549                         chain_listeners.push((
 550                                 monitor_listener_info.0,
 551                                 &monitor_listener_info.1 as &(dyn chain::Listen + Send + Sync),
 552                         ));
 553                 }
 554
 555                 init::synchronize_listeners(
 556                         bitcoind_client.as_ref(),
 557                         args.network,
 558                         &mut cache,
 559                         chain_listeners,
 560                 )
 561                 .await
 562                 .unwrap()
 563         } else {
 564                 polled_chain_tip
 565         };
 566
 567         // Step 11: Give ChannelMonitors to ChainMonitor
 568         for item in chain_listener_channel_monitors.drain(..) {
 569                 let channel_monitor = item.1 .0;
 570                 let funding_outpoint = item.2;
 571                 assert_eq!(
 572                         chain_monitor.watch_channel(funding_outpoint, channel_monitor),
 573                         ChannelMonitorUpdateStatus::Completed
 574                 );
 575         }
 576
 577         // Step 12: Optional: Initialize the P2PGossipSync
 578         let genesis = genesis_block(args.network).header.block_hash();
 579         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 580         let network_graph =
 581                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 582         let gossip_sync = Arc::new(P2PGossipSync::new(
 583                 Arc::clone(&network_graph),
 584                 None::<Arc<dyn chain::Access + Send + Sync>>,
 585                 logger.clone(),
 586         ));
 587
 588         // Step 13: Initialize the PeerManager
 589         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 590         let onion_messenger: Arc<OnionMessenger> = Arc::new(OnionMessenger::new(
 591                 Arc::clone(&keys_manager),
 592                 Arc::clone(&logger),
 593                 IgnoringMessageHandler {},
 594         ));
 595         let mut ephemeral_bytes = [0; 32];
 596         let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 597         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 598         let lightning_msg_handler = MessageHandler {
 599                 chan_handler: channel_manager.clone(),
 600                 route_handler: gossip_sync.clone(),
 601                 onion_message_handler: onion_messenger.clone(),
 602         };
 603         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 604                 lightning_msg_handler,
 605                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 606                 current_time.try_into().unwrap(),
 607                 &ephemeral_bytes,
 608                 logger.clone(),
 609                 IgnoringMessageHandler {},
 610         ));
 611
 612         // ## Running LDK
 613         // Step 14: Initialize networking
 614
 615         let peer_manager_connection_handler = peer_manager.clone();
 616         let listening_port = args.ldk_peer_listening_port;
 617         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 618         let stop_listen = Arc::clone(&stop_listen_connect);
 619         tokio::spawn(async move {
 620                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 621                         .await
 622                         .expect("Failed to bind to listen port - is something else already listening on it?");
 623                 loop {
 624                         let peer_mgr = peer_manager_connection_handler.clone();
 625                         let tcp_stream = listener.accept().await.unwrap().0;
 626                         if stop_listen.load(Ordering::Acquire) {
 627                                 return;
 628                         }
 629                         tokio::spawn(async move {
 630                                 lightning_net_tokio::setup_inbound(
 631                                         peer_mgr.clone(),
 632                                         tcp_stream.into_std().unwrap(),
 633                                 )
 634                                 .await;
 635                         });
 636                 }
 637         });
 638
 639         // Step 15: Connect and Disconnect Blocks
 640         let channel_manager_listener = channel_manager.clone();
 641         let chain_monitor_listener = chain_monitor.clone();
 642         let bitcoind_block_source = bitcoind_client.clone();
 643         let network = args.network;
 644         tokio::spawn(async move {
 645                 let chain_poller = poll::ChainPoller::new(bitcoind_block_source.as_ref(), network);
 646                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 647                 let mut spv_client = SpvClient::new(chain_tip, chain_poller, &mut cache, &chain_listener);
 648                 loop {
 649                         spv_client.poll_best_tip().await.unwrap();
 650                         tokio::time::sleep(Duration::from_secs(1)).await;
 651                 }
 652         });
 653
 654         // Step 16: Handle LDK Events
 655         let channel_manager_event_listener = channel_manager.clone();
 656         let keys_manager_listener = keys_manager.clone();
 657         // TODO: persist payment info to disk
 658         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 659         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 660         let inbound_pmts_for_events = inbound_payments.clone();
 661         let outbound_pmts_for_events = outbound_payments.clone();
 662         let network = args.network;
 663         let bitcoind_rpc = bitcoind_client.clone();
 664         let network_graph_events = network_graph.clone();
 665         let handle = tokio::runtime::Handle::current();
 666         let event_handler = move |event: Event| {
 667                 handle.block_on(handle_ldk_events(
 668                         &channel_manager_event_listener,
 669                         &bitcoind_rpc,
 670                         &network_graph_events,
 671                         &keys_manager_listener,
 672                         &inbound_pmts_for_events,
 673                         &outbound_pmts_for_events,
 674                         network,
 675                         &event,
 676                 ));
 677         };
 678
 679         // Step 17: Initialize routing ProbabilisticScorer
 680         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 681         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 682                 Path::new(&scorer_path),
 683                 Arc::clone(&network_graph),
 684                 Arc::clone(&logger),
 685         )));
 686
 687         // Step 18: Create InvoicePayer
 688         let router = DefaultRouter::new(
 689                 network_graph.clone(),
 690                 logger.clone(),
 691                 keys_manager.get_secure_random_bytes(),
 692                 scorer.clone(),
 693         );
 694         let invoice_payer = Arc::new(InvoicePayer::new(
 695                 channel_manager.clone(),
 696                 router,
 697                 logger.clone(),
 698                 event_handler,
 699                 payment::Retry::Timeout(Duration::from_secs(10)),
 700         ));
 701
 702         // Step 19: Persist ChannelManager and NetworkGraph
 703         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 704
 705         // Step 20: Background Processing
 706         let background_processor = BackgroundProcessor::start(
 707                 persister,
 708                 invoice_payer.clone(),
 709                 chain_monitor.clone(),
 710                 channel_manager.clone(),
 711                 GossipSync::p2p(gossip_sync.clone()),
 712                 peer_manager.clone(),
 713                 logger.clone(),
 714                 Some(scorer.clone()),
 715         );
 716
 717         // Regularly reconnect to channel peers.
 718         let connect_cm = Arc::clone(&channel_manager);
 719         let connect_pm = Arc::clone(&peer_manager);
 720         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 721         let stop_connect = Arc::clone(&stop_listen_connect);
 722         tokio::spawn(async move {
 723                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 724                 loop {
 725                         interval.tick().await;
 726                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 727                                 Ok(info) => {
 728                                         let peers = connect_pm.get_peer_node_ids();
 729                                         for node_id in connect_cm
 730                                                 .list_channels()
 731                                                 .iter()
 732                                                 .map(|chan| chan.counterparty.node_id)
 733                                                 .filter(|id| !peers.contains(id))
 734                                         {
 735                                                 if stop_connect.load(Ordering::Acquire) {
 736                                                         return;
 737                                                 }
 738                                                 for (pubkey, peer_addr) in info.iter() {
 739                                                         if *pubkey == node_id {
 740                                                                 let _ = cli::do_connect_peer(
 741                                                                         *pubkey,
 742                                                                         peer_addr.clone(),
 743                                                                         Arc::clone(&connect_pm),
 744                                                                 )
 745                                                                 .await;
 746                                                         }
 747                                                 }
 748                                         }
 749                                 }
 750                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 751                         }
 752                 }
 753         });
 754
 755         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 756         // some public channels, and is only useful if we have public listen address(es) to announce.
 757         // In a production environment, this should occur only after the announcement of new channels
 758         // to avoid churn in the global network graph.
 759         let peer_man = Arc::clone(&peer_manager);
 760         let network = args.network;
 761         if !args.ldk_announced_listen_addr.is_empty() {
 762                 tokio::spawn(async move {
 763                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 764                         loop {
 765                                 interval.tick().await;
 766                                 peer_man.broadcast_node_announcement(
 767                                         [0; 3],
 768                                         args.ldk_announced_node_name,
 769                                         args.ldk_announced_listen_addr.clone(),
 770                                 );
 771                         }
 772                 });
 773         }
 774
 775         // Start the CLI.
 776         cli::poll_for_user_input(
 777                 Arc::clone(&invoice_payer),
 778                 Arc::clone(&peer_manager),
 779                 Arc::clone(&channel_manager),
 780                 Arc::clone(&keys_manager),
 781                 Arc::clone(&network_graph),
 782                 Arc::clone(&onion_messenger),
 783                 inbound_payments,
 784                 outbound_payments,
 785                 ldk_data_dir.clone(),
 786                 network,
 787                 Arc::clone(&logger),
 788         )
 789         .await;
 790
 791         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 792         // updating our channel data after we've stopped the background processor.
 793         stop_listen_connect.store(true, Ordering::Release);
 794         peer_manager.disconnect_all_peers();
 795
 796         // Stop the background processor.
 797         background_processor.stop().unwrap();
 798 }
 799
 800 #[tokio::main]
 801 pub async fn main() {
 802         #[cfg(not(target_os = "windows"))]
 803         {
 804                 // Catch Ctrl-C with a dummy signal handler.
 805                 unsafe {
 806                         let mut new_action: libc::sigaction = core::mem::zeroed();
 807                         let mut old_action: libc::sigaction = core::mem::zeroed();
 808
 809                         extern "C" fn dummy_handler(
 810                                 _: libc::c_int, _: *const libc::siginfo_t, _: *const libc::c_void,
 811                         ) {
 812                         }
 813
 814                         new_action.sa_sigaction = dummy_handler as libc::sighandler_t;
 815                         new_action.sa_flags = libc::SA_SIGINFO;
 816
 817                         libc::sigaction(
 818                                 libc::SIGINT,
 819                                 &new_action as *const libc::sigaction,
 820                                 &mut old_action as *mut libc::sigaction,
 821                         );
 822                 }
 823         }
 824
 825         start_ldk().await;
 826 }