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