_ 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::chainmonitor;
  19 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager, Recipient};
  20 use lightning::chain::{BestBlock, 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::routing::gossip;
  28 use lightning::routing::gossip::{NodeId, P2PGossipSync};
  29 use lightning::routing::scoring::ProbabilisticScorer;
  30 use lightning::util::config::UserConfig;
  31 use lightning::util::events::{Event, PaymentPurpose};
  32 use lightning::util::ser::ReadableArgs;
  33 use lightning_background_processor::{BackgroundProcessor, GossipSync};
  34 use lightning_block_sync::init;
  35 use lightning_block_sync::poll;
  36 use lightning_block_sync::SpvClient;
  37 use lightning_block_sync::UnboundedCache;
  38 use lightning_invoice::payment;
  39 use lightning_invoice::utils::DefaultRouter;
  40 use lightning_net_tokio::SocketDescriptor;
  41 use lightning_persister::FilesystemPersister;
  42 use rand::{thread_rng, Rng};
  43 use std::collections::hash_map::Entry;
  44 use std::collections::HashMap;
  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::ops::Deref;
  51 use std::path::Path;
  52 use std::sync::atomic::{AtomicBool, Ordering};
  53 use std::sync::{Arc, Mutex};
  54 use std::time::{Duration, SystemTime};
  55
  56 pub(crate) enum HTLCStatus {
  57         Pending,
  58         Succeeded,
  59         Failed,
  60 }
  61
  62 pub(crate) struct MillisatAmount(Option<u64>);
  63
  64 impl fmt::Display for MillisatAmount {
  65         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  66                 match self.0 {
  67                         Some(amt) => write!(f, "{}", amt),
  68                         None => write!(f, "unknown"),
  69                 }
  70         }
  71 }
  72
  73 pub(crate) struct PaymentInfo {
  74         preimage: Option<PaymentPreimage>,
  75         secret: Option<PaymentSecret>,
  76         status: HTLCStatus,
  77         amt_msat: MillisatAmount,
  78 }
  79
  80 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
  81
  82 type ChainMonitor = chainmonitor::ChainMonitor<
  83         InMemorySigner,
  84         Arc<dyn Filter + Send + Sync>,
  85         Arc<BitcoindClient>,
  86         Arc<BitcoindClient>,
  87         Arc<FilesystemLogger>,
  88         Arc<FilesystemPersister>,
  89 >;
  90
  91 pub(crate) type PeerManager = SimpleArcPeerManager<
  92         SocketDescriptor,
  93         ChainMonitor,
  94         BitcoindClient,
  95         BitcoindClient,
  96         dyn chain::Access + Send + Sync,
  97         FilesystemLogger,
  98 >;
  99
 100 pub(crate) type ChannelManager =
 101         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 102
 103 pub(crate) type InvoicePayer<E> = payment::InvoicePayer<
 104         Arc<ChannelManager>,
 105         Router,
 106         Arc<Mutex<ProbabilisticScorer<Arc<NetworkGraph>, Arc<FilesystemLogger>>>>,
 107         Arc<FilesystemLogger>,
 108         E,
 109 >;
 110
 111 type Router = DefaultRouter<Arc<NetworkGraph>, Arc<FilesystemLogger>>;
 112
 113 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 114
 115 async fn handle_ldk_events(
 116         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 117         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 118         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 119         network: Network, event: &Event,
 120 ) {
 121         match event {
 122                 Event::FundingGenerationReady {
 123                         temporary_channel_id,
 124                         counterparty_node_id,
 125                         channel_value_satoshis,
 126                         output_script,
 127                         ..
 128                 } => {
 129                         // Construct the raw transaction with one output, that is paid the amount of the
 130                         // channel.
 131                         let addr = WitnessProgram::from_scriptpubkey(
 132                                 &output_script[..],
 133                                 match network {
 134                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 135                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 136                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 137                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 138                                 },
 139                         )
 140                         .expect("Lightning funding tx should always be to a SegWit output")
 141                         .to_address();
 142                         let mut outputs = vec![HashMap::with_capacity(1)];
 143                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 144                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 145
 146                         // Have your wallet put the inputs into the transaction such that the output is
 147                         // satisfied.
 148                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 149
 150                         // Sign the final funding transaction and broadcast it.
 151                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 152                         assert_eq!(signed_tx.complete, true);
 153                         let final_tx: Transaction =
 154                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 155                         // Give the funding transaction back to LDK for opening the channel.
 156                         if channel_manager
 157                                 .funding_transaction_generated(
 158                                         &temporary_channel_id,
 159                                         counterparty_node_id,
 160                                         final_tx,
 161                                 )
 162                                 .is_err()
 163                         {
 164                                 println!(
 165                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 166                                 print!("> ");
 167                                 io::stdout().flush().unwrap();
 168                         }
 169                 }
 170                 Event::PaymentReceived { payment_hash, purpose, amount_msat } => {
 171                         println!(
 172                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 173                                 hex_utils::hex_str(&payment_hash.0),
 174                                 amount_msat,
 175                         );
 176                         print!("> ");
 177                         io::stdout().flush().unwrap();
 178                         let payment_preimage = match purpose {
 179                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 180                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 181                         };
 182                         channel_manager.claim_funds(payment_preimage.unwrap());
 183                 }
 184                 Event::PaymentClaimed { payment_hash, purpose, amount_msat } => {
 185                         println!(
 186                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 187                                 hex_utils::hex_str(&payment_hash.0),
 188                                 amount_msat,
 189                         );
 190                         print!("> ");
 191                         io::stdout().flush().unwrap();
 192                         let (payment_preimage, payment_secret) = match purpose {
 193                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 194                                         (*payment_preimage, Some(*payment_secret))
 195                                 }
 196                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 197                         };
 198                         let mut payments = inbound_payments.lock().unwrap();
 199                         match payments.entry(*payment_hash) {
 200                                 Entry::Occupied(mut e) => {
 201                                         let payment = e.get_mut();
 202                                         payment.status = HTLCStatus::Succeeded;
 203                                         payment.preimage = payment_preimage;
 204                                         payment.secret = payment_secret;
 205                                 }
 206                                 Entry::Vacant(e) => {
 207                                         e.insert(PaymentInfo {
 208                                                 preimage: payment_preimage,
 209                                                 secret: payment_secret,
 210                                                 status: HTLCStatus::Succeeded,
 211                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 212                                         });
 213                                 }
 214                         }
 215                 }
 216                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 217                         let mut payments = outbound_payments.lock().unwrap();
 218                         for (hash, payment) in payments.iter_mut() {
 219                                 if *hash == *payment_hash {
 220                                         payment.preimage = Some(*payment_preimage);
 221                                         payment.status = HTLCStatus::Succeeded;
 222                                         println!(
 223                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 224                                                                  payment hash {:?} with preimage {:?}",
 225                                                 payment.amt_msat,
 226                                                 if let Some(fee) = fee_paid_msat {
 227                                                         format!(" (fee {} msat)", fee)
 228                                                 } else {
 229                                                         "".to_string()
 230                                                 },
 231                                                 hex_utils::hex_str(&payment_hash.0),
 232                                                 hex_utils::hex_str(&payment_preimage.0)
 233                                         );
 234                                         print!("> ");
 235                                         io::stdout().flush().unwrap();
 236                                 }
 237                         }
 238                 }
 239                 Event::OpenChannelRequest { .. } => {
 240                         // Unreachable, we don't set manually_accept_inbound_channels
 241                 }
 242                 Event::PaymentPathSuccessful { .. } => {}
 243                 Event::PaymentPathFailed { .. } => {}
 244                 Event::ProbeSuccessful { .. } => {}
 245                 Event::ProbeFailed { .. } => {}
 246                 Event::PaymentFailed { payment_hash, .. } => {
 247                         print!(
 248                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 249                                 hex_utils::hex_str(&payment_hash.0)
 250                         );
 251                         print!("> ");
 252                         io::stdout().flush().unwrap();
 253
 254                         let mut payments = outbound_payments.lock().unwrap();
 255                         if payments.contains_key(&payment_hash) {
 256                                 let payment = payments.get_mut(&payment_hash).unwrap();
 257                                 payment.status = HTLCStatus::Failed;
 258                         }
 259                 }
 260                 Event::PaymentForwarded {
 261                         prev_channel_id,
 262                         next_channel_id,
 263                         fee_earned_msat,
 264                         claim_from_onchain_tx,
 265                 } => {
 266                         let read_only_network_graph = network_graph.read_only();
 267                         let nodes = read_only_network_graph.nodes();
 268                         let channels = channel_manager.list_channels();
 269
 270                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 271                                 None => String::new(),
 272                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 273                                         None => String::new(),
 274                                         Some(channel) => {
 275                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 276                                                         None => "private node".to_string(),
 277                                                         Some(node) => match &node.announcement_info {
 278                                                                 None => "unnamed node".to_string(),
 279                                                                 Some(announcement) => {
 280                                                                         format!("node {}", announcement.alias)
 281                                                                 }
 282                                                         },
 283                                                 }
 284                                         }
 285                                 },
 286                         };
 287                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 288                                 channel_id
 289                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 290                                         .unwrap_or_default()
 291                         };
 292                         let from_prev_str =
 293                                 format!(" from {}{}", node_str(prev_channel_id), channel_str(prev_channel_id));
 294                         let to_next_str =
 295                                 format!(" to {}{}", node_str(next_channel_id), channel_str(next_channel_id));
 296
 297                         let from_onchain_str = if *claim_from_onchain_tx {
 298                                 "from onchain downstream claim"
 299                         } else {
 300                                 "from HTLC fulfill message"
 301                         };
 302                         if let Some(fee_earned) = fee_earned_msat {
 303                                 println!(
 304                                         "\nEVENT: Forwarded payment{}{}, earning {} msat {}",
 305                                         from_prev_str, to_next_str, fee_earned, from_onchain_str
 306                                 );
 307                         } else {
 308                                 println!(
 309                                         "\nEVENT: Forwarded payment{}{}, claiming onchain {}",
 310                                         from_prev_str, to_next_str, from_onchain_str
 311                                 );
 312                         }
 313                         print!("> ");
 314                         io::stdout().flush().unwrap();
 315                 }
 316                 Event::HTLCHandlingFailed { .. } => {}
 317                 Event::PendingHTLCsForwardable { time_forwardable } => {
 318                         let forwarding_channel_manager = channel_manager.clone();
 319                         let min = time_forwardable.as_millis() as u64;
 320                         tokio::spawn(async move {
 321                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 322                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 323                                 forwarding_channel_manager.process_pending_htlc_forwards();
 324                         });
 325                 }
 326                 Event::SpendableOutputs { outputs } => {
 327                         let destination_address = bitcoind_client.get_new_address().await;
 328                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 329                         let tx_feerate =
 330                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 331                         let spending_tx = keys_manager
 332                                 .spend_spendable_outputs(
 333                                         output_descriptors,
 334                                         Vec::new(),
 335                                         destination_address.script_pubkey(),
 336                                         tx_feerate,
 337                                         &Secp256k1::new(),
 338                                 )
 339                                 .unwrap();
 340                         bitcoind_client.broadcast_transaction(&spending_tx);
 341                 }
 342                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 343                         println!(
 344                                 "\nEVENT: Channel {} closed due to: {:?}",
 345                                 hex_utils::hex_str(channel_id),
 346                                 reason
 347                         );
 348                         print!("> ");
 349                         io::stdout().flush().unwrap();
 350                 }
 351                 Event::DiscardFunding { .. } => {
 352                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 353                         // the funding transaction either confirms, or this event is generated.
 354                 }
 355         }
 356 }
 357
 358 async fn start_ldk() {
 359         let args = match cli::parse_startup_args() {
 360                 Ok(user_args) => user_args,
 361                 Err(()) => return,
 362         };
 363
 364         // Initialize the LDK data directory if necessary.
 365         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 366         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 367
 368         // Initialize our bitcoind client.
 369         let bitcoind_client = match BitcoindClient::new(
 370                 args.bitcoind_rpc_host.clone(),
 371                 args.bitcoind_rpc_port,
 372                 args.bitcoind_rpc_username.clone(),
 373                 args.bitcoind_rpc_password.clone(),
 374                 tokio::runtime::Handle::current(),
 375         )
 376         .await
 377         {
 378                 Ok(client) => Arc::new(client),
 379                 Err(e) => {
 380                         println!("Failed to connect to bitcoind client: {}", e);
 381                         return;
 382                 }
 383         };
 384
 385         // Check that the bitcoind we've connected to is running the network we expect
 386         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 387         if bitcoind_chain
 388                 != match args.network {
 389                         bitcoin::Network::Bitcoin => "main",
 390                         bitcoin::Network::Testnet => "test",
 391                         bitcoin::Network::Regtest => "regtest",
 392                         bitcoin::Network::Signet => "signet",
 393                 } {
 394                 println!(
 395                         "Chain argument ({}) didn't match bitcoind chain ({})",
 396                         args.network, bitcoind_chain
 397                 );
 398                 return;
 399         }
 400
 401         // ## Setup
 402         // Step 1: Initialize the FeeEstimator
 403
 404         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 405         let fee_estimator = bitcoind_client.clone();
 406
 407         // Step 2: Initialize the Logger
 408         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 409
 410         // Step 3: Initialize the BroadcasterInterface
 411
 412         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 413         // broadcaster.
 414         let broadcaster = bitcoind_client.clone();
 415
 416         // Step 4: Initialize Persist
 417         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 418
 419         // Step 5: Initialize the ChainMonitor
 420         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 421                 None,
 422                 broadcaster.clone(),
 423                 logger.clone(),
 424                 fee_estimator.clone(),
 425                 persister.clone(),
 426         ));
 427
 428         // Step 6: Initialize the KeysManager
 429
 430         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 431         // other secret key material.
 432         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 433         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 434                 assert_eq!(seed.len(), 32);
 435                 let mut key = [0; 32];
 436                 key.copy_from_slice(&seed);
 437                 key
 438         } else {
 439                 let mut key = [0; 32];
 440                 thread_rng().fill_bytes(&mut key);
 441                 match File::create(keys_seed_path.clone()) {
 442                         Ok(mut f) => {
 443                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 444                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 445                         }
 446                         Err(e) => {
 447                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 448                                 return;
 449                         }
 450                 }
 451                 key
 452         };
 453         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 454         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 455
 456         // Step 7: Read ChannelMonitor state from disk
 457         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 458
 459         // Step 8: Initialize the ChannelManager
 460         let mut user_config = UserConfig::default();
 461         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 462         let mut restarting_node = true;
 463         let (channel_manager_blockhash, channel_manager) = {
 464                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 465                         let mut channel_monitor_mut_references = Vec::new();
 466                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 467                                 channel_monitor_mut_references.push(channel_monitor);
 468                         }
 469                         let read_args = ChannelManagerReadArgs::new(
 470                                 keys_manager.clone(),
 471                                 fee_estimator.clone(),
 472                                 chain_monitor.clone(),
 473                                 broadcaster.clone(),
 474                                 logger.clone(),
 475                                 user_config,
 476                                 channel_monitor_mut_references,
 477                         );
 478                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 479                 } else {
 480                         // We're starting a fresh node.
 481                         restarting_node = false;
 482                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 483
 484                         let chain_params = ChainParameters {
 485                                 network: args.network,
 486                                 best_block: BestBlock::new(
 487                                         getinfo_resp.latest_blockhash,
 488                                         getinfo_resp.latest_height as u32,
 489                                 ),
 490                         };
 491                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 492                                 fee_estimator.clone(),
 493                                 chain_monitor.clone(),
 494                                 broadcaster.clone(),
 495                                 logger.clone(),
 496                                 keys_manager.clone(),
 497                                 user_config,
 498                                 chain_params,
 499                         );
 500                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 501                 }
 502         };
 503
 504         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 505         let mut chain_listener_channel_monitors = Vec::new();
 506         let mut cache = UnboundedCache::new();
 507         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 508         if restarting_node {
 509                 let mut chain_listeners =
 510                         vec![(channel_manager_blockhash, &channel_manager as &dyn chain::Listen)];
 511
 512                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 513                         let outpoint = channel_monitor.get_funding_txo().0;
 514                         chain_listener_channel_monitors.push((
 515                                 blockhash,
 516                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 517                                 outpoint,
 518                         ));
 519                 }
 520
 521                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 522                         chain_listeners
 523                                 .push((monitor_listener_info.0, &monitor_listener_info.1 as &dyn chain::Listen));
 524                 }
 525                 chain_tip = Some(
 526                         init::synchronize_listeners(
 527                                 &mut bitcoind_client.deref(),
 528                                 args.network,
 529                                 &mut cache,
 530                                 chain_listeners,
 531                         )
 532                         .await
 533                         .unwrap(),
 534                 );
 535         }
 536
 537         // Step 10: Give ChannelMonitors to ChainMonitor
 538         for item in chain_listener_channel_monitors.drain(..) {
 539                 let channel_monitor = item.1 .0;
 540                 let funding_outpoint = item.2;
 541                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 542         }
 543
 544         // Step 11: Optional: Initialize the P2PGossipSync
 545         let genesis = genesis_block(args.network).header.block_hash();
 546         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 547         let network_graph =
 548                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 549         let gossip_sync = Arc::new(P2PGossipSync::new(
 550                 Arc::clone(&network_graph),
 551                 None::<Arc<dyn chain::Access + Send + Sync>>,
 552                 logger.clone(),
 553         ));
 554
 555         // Step 12: Initialize the PeerManager
 556         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 557         let mut ephemeral_bytes = [0; 32];
 558         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 559         let lightning_msg_handler = MessageHandler {
 560                 chan_handler: channel_manager.clone(),
 561                 route_handler: gossip_sync.clone(),
 562         };
 563         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 564                 lightning_msg_handler,
 565                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 566                 &ephemeral_bytes,
 567                 logger.clone(),
 568                 Arc::new(IgnoringMessageHandler {}),
 569         ));
 570
 571         // ## Running LDK
 572         // Step 13: Initialize networking
 573
 574         let peer_manager_connection_handler = peer_manager.clone();
 575         let listening_port = args.ldk_peer_listening_port;
 576         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 577         let stop_listen = Arc::clone(&stop_listen_connect);
 578         tokio::spawn(async move {
 579                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 580                         .await
 581                         .expect("Failed to bind to listen port - is something else already listening on it?");
 582                 loop {
 583                         let peer_mgr = peer_manager_connection_handler.clone();
 584                         let tcp_stream = listener.accept().await.unwrap().0;
 585                         if stop_listen.load(Ordering::Acquire) {
 586                                 return;
 587                         }
 588                         tokio::spawn(async move {
 589                                 lightning_net_tokio::setup_inbound(
 590                                         peer_mgr.clone(),
 591                                         tcp_stream.into_std().unwrap(),
 592                                 )
 593                                 .await;
 594                         });
 595                 }
 596         });
 597
 598         // Step 14: Connect and Disconnect Blocks
 599         if chain_tip.is_none() {
 600                 chain_tip =
 601                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 602         }
 603         let channel_manager_listener = channel_manager.clone();
 604         let chain_monitor_listener = chain_monitor.clone();
 605         let bitcoind_block_source = bitcoind_client.clone();
 606         let network = args.network;
 607         tokio::spawn(async move {
 608                 let mut derefed = bitcoind_block_source.deref();
 609                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 610                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 611                 let mut spv_client =
 612                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 613                 loop {
 614                         spv_client.poll_best_tip().await.unwrap();
 615                         tokio::time::sleep(Duration::from_secs(1)).await;
 616                 }
 617         });
 618
 619         // Step 15: Handle LDK Events
 620         let channel_manager_event_listener = channel_manager.clone();
 621         let keys_manager_listener = keys_manager.clone();
 622         // TODO: persist payment info to disk
 623         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 624         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 625         let inbound_pmts_for_events = inbound_payments.clone();
 626         let outbound_pmts_for_events = outbound_payments.clone();
 627         let network = args.network;
 628         let bitcoind_rpc = bitcoind_client.clone();
 629         let network_graph_events = network_graph.clone();
 630         let handle = tokio::runtime::Handle::current();
 631         let event_handler = move |event: &Event| {
 632                 handle.block_on(handle_ldk_events(
 633                         &channel_manager_event_listener,
 634                         &bitcoind_rpc,
 635                         &network_graph_events,
 636                         &keys_manager_listener,
 637                         &inbound_pmts_for_events,
 638                         &outbound_pmts_for_events,
 639                         network,
 640                         event,
 641                 ));
 642         };
 643
 644         // Step 16: Initialize routing ProbabilisticScorer
 645         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 646         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 647                 Path::new(&scorer_path),
 648                 Arc::clone(&network_graph),
 649                 Arc::clone(&logger),
 650         )));
 651
 652         // Step 17: Create InvoicePayer
 653         let router = DefaultRouter::new(
 654                 network_graph.clone(),
 655                 logger.clone(),
 656                 keys_manager.get_secure_random_bytes(),
 657         );
 658         let invoice_payer = Arc::new(InvoicePayer::new(
 659                 channel_manager.clone(),
 660                 router,
 661                 scorer.clone(),
 662                 logger.clone(),
 663                 event_handler,
 664                 payment::Retry::Timeout(Duration::from_secs(10)),
 665         ));
 666
 667         // Step 18: Persist ChannelManager and NetworkGraph
 668         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 669
 670         // Step 19: Background Processing
 671         let background_processor = BackgroundProcessor::start(
 672                 persister,
 673                 invoice_payer.clone(),
 674                 chain_monitor.clone(),
 675                 channel_manager.clone(),
 676                 GossipSync::p2p(gossip_sync.clone()),
 677                 peer_manager.clone(),
 678                 logger.clone(),
 679                 Some(scorer.clone()),
 680         );
 681
 682         // Regularly reconnect to channel peers.
 683         let connect_cm = Arc::clone(&channel_manager);
 684         let connect_pm = Arc::clone(&peer_manager);
 685         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 686         let stop_connect = Arc::clone(&stop_listen_connect);
 687         tokio::spawn(async move {
 688                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 689                 loop {
 690                         interval.tick().await;
 691                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 692                                 Ok(info) => {
 693                                         let peers = connect_pm.get_peer_node_ids();
 694                                         for node_id in connect_cm
 695                                                 .list_channels()
 696                                                 .iter()
 697                                                 .map(|chan| chan.counterparty.node_id)
 698                                                 .filter(|id| !peers.contains(id))
 699                                         {
 700                                                 if stop_connect.load(Ordering::Acquire) {
 701                                                         return;
 702                                                 }
 703                                                 for (pubkey, peer_addr) in info.iter() {
 704                                                         if *pubkey == node_id {
 705                                                                 let _ = cli::do_connect_peer(
 706                                                                         *pubkey,
 707                                                                         peer_addr.clone(),
 708                                                                         Arc::clone(&connect_pm),
 709                                                                 )
 710                                                                 .await;
 711                                                         }
 712                                                 }
 713                                         }
 714                                 }
 715                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 716                         }
 717                 }
 718         });
 719
 720         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 721         // some public channels, and is only useful if we have public listen address(es) to announce.
 722         // In a production environment, this should occur only after the announcement of new channels
 723         // to avoid churn in the global network graph.
 724         let chan_manager = Arc::clone(&channel_manager);
 725         let network = args.network;
 726         if !args.ldk_announced_listen_addr.is_empty() {
 727                 tokio::spawn(async move {
 728                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 729                         loop {
 730                                 interval.tick().await;
 731                                 chan_manager.broadcast_node_announcement(
 732                                         [0; 3],
 733                                         args.ldk_announced_node_name,
 734                                         args.ldk_announced_listen_addr.clone(),
 735                                 );
 736                         }
 737                 });
 738         }
 739
 740         // Start the CLI.
 741         cli::poll_for_user_input(
 742                 Arc::clone(&invoice_payer),
 743                 Arc::clone(&peer_manager),
 744                 Arc::clone(&channel_manager),
 745                 Arc::clone(&keys_manager),
 746                 Arc::clone(&network_graph),
 747                 inbound_payments,
 748                 outbound_payments,
 749                 ldk_data_dir.clone(),
 750                 network,
 751         )
 752         .await;
 753
 754         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 755         // updating our channel data after we've stopped the background processor.
 756         stop_listen_connect.store(true, Ordering::Release);
 757         peer_manager.disconnect_all_peers();
 758
 759         // Stop the background processor.
 760         background_processor.stop().unwrap();
 761 }
 762
 763 #[tokio::main]
 764 pub async fn main() {
 765         start_ldk().await;
 766 }