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