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

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