_ 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::onion_message::SimpleArcOnionMessenger;
  28 use lightning::routing::gossip;
  29 use lightning::routing::gossip::{NodeId, P2PGossipSync};
  30 use lightning::routing::scoring::ProbabilisticScorer;
  31 use lightning::util::config::UserConfig;
  32 use lightning::util::events::{Event, PaymentPurpose};
  33 use lightning::util::ser::ReadableArgs;
  34 use lightning_background_processor::{BackgroundProcessor, GossipSync};
  35 use lightning_block_sync::init;
  36 use lightning_block_sync::poll;
  37 use lightning_block_sync::SpvClient;
  38 use lightning_block_sync::UnboundedCache;
  39 use lightning_invoice::payment;
  40 use lightning_invoice::utils::DefaultRouter;
  41 use lightning_net_tokio::SocketDescriptor;
  42 use lightning_persister::FilesystemPersister;
  43 use rand::{thread_rng, Rng};
  44 use std::collections::hash_map::Entry;
  45 use std::collections::HashMap;
  46 use std::fmt;
  47 use std::fs;
  48 use std::fs::File;
  49 use std::io;
  50 use std::io::Write;
  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 type OnionMessenger = SimpleArcOnionMessenger<FilesystemLogger>;
 116
 117 async fn handle_ldk_events(
 118         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 119         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 120         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 121         network: Network, event: &Event,
 122 ) {
 123         match event {
 124                 Event::FundingGenerationReady {
 125                         temporary_channel_id,
 126                         counterparty_node_id,
 127                         channel_value_satoshis,
 128                         output_script,
 129                         ..
 130                 } => {
 131                         // Construct the raw transaction with one output, that is paid the amount of the
 132                         // channel.
 133                         let addr = WitnessProgram::from_scriptpubkey(
 134                                 &output_script[..],
 135                                 match network {
 136                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 137                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 138                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 139                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 140                                 },
 141                         )
 142                         .expect("Lightning funding tx should always be to a SegWit output")
 143                         .to_address();
 144                         let mut outputs = vec![HashMap::with_capacity(1)];
 145                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 146                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 147
 148                         // Have your wallet put the inputs into the transaction such that the output is
 149                         // satisfied.
 150                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 151
 152                         // Sign the final funding transaction and broadcast it.
 153                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 154                         assert_eq!(signed_tx.complete, true);
 155                         let final_tx: Transaction =
 156                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 157                         // Give the funding transaction back to LDK for opening the channel.
 158                         if channel_manager
 159                                 .funding_transaction_generated(
 160                                         &temporary_channel_id,
 161                                         counterparty_node_id,
 162                                         final_tx,
 163                                 )
 164                                 .is_err()
 165                         {
 166                                 println!(
 167                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 168                                 print!("> ");
 169                                 io::stdout().flush().unwrap();
 170                         }
 171                 }
 172                 Event::PaymentReceived { payment_hash, purpose, amount_msat } => {
 173                         println!(
 174                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 175                                 hex_utils::hex_str(&payment_hash.0),
 176                                 amount_msat,
 177                         );
 178                         print!("> ");
 179                         io::stdout().flush().unwrap();
 180                         let payment_preimage = match purpose {
 181                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 182                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 183                         };
 184                         channel_manager.claim_funds(payment_preimage.unwrap());
 185                 }
 186                 Event::PaymentClaimed { payment_hash, purpose, amount_msat } => {
 187                         println!(
 188                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 189                                 hex_utils::hex_str(&payment_hash.0),
 190                                 amount_msat,
 191                         );
 192                         print!("> ");
 193                         io::stdout().flush().unwrap();
 194                         let (payment_preimage, payment_secret) = match purpose {
 195                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 196                                         (*payment_preimage, Some(*payment_secret))
 197                                 }
 198                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 199                         };
 200                         let mut payments = inbound_payments.lock().unwrap();
 201                         match payments.entry(*payment_hash) {
 202                                 Entry::Occupied(mut e) => {
 203                                         let payment = e.get_mut();
 204                                         payment.status = HTLCStatus::Succeeded;
 205                                         payment.preimage = payment_preimage;
 206                                         payment.secret = payment_secret;
 207                                 }
 208                                 Entry::Vacant(e) => {
 209                                         e.insert(PaymentInfo {
 210                                                 preimage: payment_preimage,
 211                                                 secret: payment_secret,
 212                                                 status: HTLCStatus::Succeeded,
 213                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 214                                         });
 215                                 }
 216                         }
 217                 }
 218                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 219                         let mut payments = outbound_payments.lock().unwrap();
 220                         for (hash, payment) in payments.iter_mut() {
 221                                 if *hash == *payment_hash {
 222                                         payment.preimage = Some(*payment_preimage);
 223                                         payment.status = HTLCStatus::Succeeded;
 224                                         println!(
 225                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 226                                                                  payment hash {:?} with preimage {:?}",
 227                                                 payment.amt_msat,
 228                                                 if let Some(fee) = fee_paid_msat {
 229                                                         format!(" (fee {} msat)", fee)
 230                                                 } else {
 231                                                         "".to_string()
 232                                                 },
 233                                                 hex_utils::hex_str(&payment_hash.0),
 234                                                 hex_utils::hex_str(&payment_preimage.0)
 235                                         );
 236                                         print!("> ");
 237                                         io::stdout().flush().unwrap();
 238                                 }
 239                         }
 240                 }
 241                 Event::OpenChannelRequest { .. } => {
 242                         // Unreachable, we don't set manually_accept_inbound_channels
 243                 }
 244                 Event::PaymentPathSuccessful { .. } => {}
 245                 Event::PaymentPathFailed { .. } => {}
 246                 Event::ProbeSuccessful { .. } => {}
 247                 Event::ProbeFailed { .. } => {}
 248                 Event::PaymentFailed { payment_hash, .. } => {
 249                         print!(
 250                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 251                                 hex_utils::hex_str(&payment_hash.0)
 252                         );
 253                         print!("> ");
 254                         io::stdout().flush().unwrap();
 255
 256                         let mut payments = outbound_payments.lock().unwrap();
 257                         if payments.contains_key(&payment_hash) {
 258                                 let payment = payments.get_mut(&payment_hash).unwrap();
 259                                 payment.status = HTLCStatus::Failed;
 260                         }
 261                 }
 262                 Event::PaymentForwarded {
 263                         prev_channel_id,
 264                         next_channel_id,
 265                         fee_earned_msat,
 266                         claim_from_onchain_tx,
 267                 } => {
 268                         let read_only_network_graph = network_graph.read_only();
 269                         let nodes = read_only_network_graph.nodes();
 270                         let channels = channel_manager.list_channels();
 271
 272                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 273                                 None => String::new(),
 274                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 275                                         None => String::new(),
 276                                         Some(channel) => {
 277                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 278                                                         None => "private node".to_string(),
 279                                                         Some(node) => match &node.announcement_info {
 280                                                                 None => "unnamed node".to_string(),
 281                                                                 Some(announcement) => {
 282                                                                         format!("node {}", announcement.alias)
 283                                                                 }
 284                                                         },
 285                                                 }
 286                                         }
 287                                 },
 288                         };
 289                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 290                                 channel_id
 291                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 292                                         .unwrap_or_default()
 293                         };
 294                         let from_prev_str =
 295                                 format!(" from {}{}", node_str(prev_channel_id), channel_str(prev_channel_id));
 296                         let to_next_str =
 297                                 format!(" to {}{}", node_str(next_channel_id), channel_str(next_channel_id));
 298
 299                         let from_onchain_str = if *claim_from_onchain_tx {
 300                                 "from onchain downstream claim"
 301                         } else {
 302                                 "from HTLC fulfill message"
 303                         };
 304                         if let Some(fee_earned) = fee_earned_msat {
 305                                 println!(
 306                                         "\nEVENT: Forwarded payment{}{}, earning {} msat {}",
 307                                         from_prev_str, to_next_str, fee_earned, from_onchain_str
 308                                 );
 309                         } else {
 310                                 println!(
 311                                         "\nEVENT: Forwarded payment{}{}, claiming onchain {}",
 312                                         from_prev_str, to_next_str, from_onchain_str
 313                                 );
 314                         }
 315                         print!("> ");
 316                         io::stdout().flush().unwrap();
 317                 }
 318                 Event::HTLCHandlingFailed { .. } => {}
 319                 Event::PendingHTLCsForwardable { time_forwardable } => {
 320                         let forwarding_channel_manager = channel_manager.clone();
 321                         let min = time_forwardable.as_millis() as u64;
 322                         tokio::spawn(async move {
 323                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 324                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 325                                 forwarding_channel_manager.process_pending_htlc_forwards();
 326                         });
 327                 }
 328                 Event::SpendableOutputs { outputs } => {
 329                         let destination_address = bitcoind_client.get_new_address().await;
 330                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 331                         let tx_feerate =
 332                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 333                         let spending_tx = keys_manager
 334                                 .spend_spendable_outputs(
 335                                         output_descriptors,
 336                                         Vec::new(),
 337                                         destination_address.script_pubkey(),
 338                                         tx_feerate,
 339                                         &Secp256k1::new(),
 340                                 )
 341                                 .unwrap();
 342                         bitcoind_client.broadcast_transaction(&spending_tx);
 343                 }
 344                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 345                         println!(
 346                                 "\nEVENT: Channel {} closed due to: {:?}",
 347                                 hex_utils::hex_str(channel_id),
 348                                 reason
 349                         );
 350                         print!("> ");
 351                         io::stdout().flush().unwrap();
 352                 }
 353                 Event::DiscardFunding { .. } => {
 354                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 355                         // the funding transaction either confirms, or this event is generated.
 356                 }
 357         }
 358 }
 359
 360 async fn start_ldk() {
 361         let args = match cli::parse_startup_args() {
 362                 Ok(user_args) => user_args,
 363                 Err(()) => return,
 364         };
 365
 366         // Initialize the LDK data directory if necessary.
 367         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 368         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 369
 370         // Initialize our bitcoind client.
 371         let bitcoind_client = match BitcoindClient::new(
 372                 args.bitcoind_rpc_host.clone(),
 373                 args.bitcoind_rpc_port,
 374                 args.bitcoind_rpc_username.clone(),
 375                 args.bitcoind_rpc_password.clone(),
 376                 tokio::runtime::Handle::current(),
 377         )
 378         .await
 379         {
 380                 Ok(client) => Arc::new(client),
 381                 Err(e) => {
 382                         println!("Failed to connect to bitcoind client: {}", e);
 383                         return;
 384                 }
 385         };
 386
 387         // Check that the bitcoind we've connected to is running the network we expect
 388         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 389         if bitcoind_chain
 390                 != match args.network {
 391                         bitcoin::Network::Bitcoin => "main",
 392                         bitcoin::Network::Testnet => "test",
 393                         bitcoin::Network::Regtest => "regtest",
 394                         bitcoin::Network::Signet => "signet",
 395                 } {
 396                 println!(
 397                         "Chain argument ({}) didn't match bitcoind chain ({})",
 398                         args.network, bitcoind_chain
 399                 );
 400                 return;
 401         }
 402
 403         // ## Setup
 404         // Step 1: Initialize the FeeEstimator
 405
 406         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 407         let fee_estimator = bitcoind_client.clone();
 408
 409         // Step 2: Initialize the Logger
 410         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 411
 412         // Step 3: Initialize the BroadcasterInterface
 413
 414         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 415         // broadcaster.
 416         let broadcaster = bitcoind_client.clone();
 417
 418         // Step 4: Initialize Persist
 419         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 420
 421         // Step 5: Initialize the ChainMonitor
 422         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 423                 None,
 424                 broadcaster.clone(),
 425                 logger.clone(),
 426                 fee_estimator.clone(),
 427                 persister.clone(),
 428         ));
 429
 430         // Step 6: Initialize the KeysManager
 431
 432         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 433         // other secret key material.
 434         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 435         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 436                 assert_eq!(seed.len(), 32);
 437                 let mut key = [0; 32];
 438                 key.copy_from_slice(&seed);
 439                 key
 440         } else {
 441                 let mut key = [0; 32];
 442                 thread_rng().fill_bytes(&mut key);
 443                 match File::create(keys_seed_path.clone()) {
 444                         Ok(mut f) => {
 445                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 446                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 447                         }
 448                         Err(e) => {
 449                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 450                                 return;
 451                         }
 452                 }
 453                 key
 454         };
 455         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 456         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 457
 458         // Step 7: Read ChannelMonitor state from disk
 459         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 460
 461         // Step 8: Initialize the ChannelManager
 462         let mut user_config = UserConfig::default();
 463         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 464         let mut restarting_node = true;
 465         let (channel_manager_blockhash, channel_manager) = {
 466                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 467                         let mut channel_monitor_mut_references = Vec::new();
 468                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 469                                 channel_monitor_mut_references.push(channel_monitor);
 470                         }
 471                         let read_args = ChannelManagerReadArgs::new(
 472                                 keys_manager.clone(),
 473                                 fee_estimator.clone(),
 474                                 chain_monitor.clone(),
 475                                 broadcaster.clone(),
 476                                 logger.clone(),
 477                                 user_config,
 478                                 channel_monitor_mut_references,
 479                         );
 480                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 481                 } else {
 482                         // We're starting a fresh node.
 483                         restarting_node = false;
 484                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 485
 486                         let chain_params = ChainParameters {
 487                                 network: args.network,
 488                                 best_block: BestBlock::new(
 489                                         getinfo_resp.latest_blockhash,
 490                                         getinfo_resp.latest_height as u32,
 491                                 ),
 492                         };
 493                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 494                                 fee_estimator.clone(),
 495                                 chain_monitor.clone(),
 496                                 broadcaster.clone(),
 497                                 logger.clone(),
 498                                 keys_manager.clone(),
 499                                 user_config,
 500                                 chain_params,
 501                         );
 502                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 503                 }
 504         };
 505
 506         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 507         let mut chain_listener_channel_monitors = Vec::new();
 508         let mut cache = UnboundedCache::new();
 509         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 510         if restarting_node {
 511                 let mut chain_listeners =
 512                         vec![(channel_manager_blockhash, &channel_manager as &dyn chain::Listen)];
 513
 514                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 515                         let outpoint = channel_monitor.get_funding_txo().0;
 516                         chain_listener_channel_monitors.push((
 517                                 blockhash,
 518                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 519                                 outpoint,
 520                         ));
 521                 }
 522
 523                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 524                         chain_listeners
 525                                 .push((monitor_listener_info.0, &monitor_listener_info.1 as &dyn chain::Listen));
 526                 }
 527                 chain_tip = Some(
 528                         init::synchronize_listeners(
 529                                 bitcoind_client.as_ref(),
 530                                 args.network,
 531                                 &mut cache,
 532                                 chain_listeners,
 533                         )
 534                         .await
 535                         .unwrap(),
 536                 );
 537         }
 538
 539         // Step 10: Give ChannelMonitors to ChainMonitor
 540         for item in chain_listener_channel_monitors.drain(..) {
 541                 let channel_monitor = item.1 .0;
 542                 let funding_outpoint = item.2;
 543                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 544         }
 545
 546         // Step 11: Optional: Initialize the P2PGossipSync
 547         let genesis = genesis_block(args.network).header.block_hash();
 548         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 549         let network_graph =
 550                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 551         let gossip_sync = Arc::new(P2PGossipSync::new(
 552                 Arc::clone(&network_graph),
 553                 None::<Arc<dyn chain::Access + Send + Sync>>,
 554                 logger.clone(),
 555         ));
 556
 557         // Step 12: Initialize the PeerManager
 558         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 559         let onion_messenger: Arc<OnionMessenger> =
 560                 Arc::new(OnionMessenger::new(keys_manager.clone(), logger.clone()));
 561         let mut ephemeral_bytes = [0; 32];
 562         let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 563         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 564         let lightning_msg_handler = MessageHandler {
 565                 chan_handler: channel_manager.clone(),
 566                 route_handler: gossip_sync.clone(),
 567                 onion_message_handler: onion_messenger.clone(),
 568         };
 569         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 570                 lightning_msg_handler,
 571                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 572                 current_time,
 573                 &ephemeral_bytes,
 574                 logger.clone(),
 575                 IgnoringMessageHandler {},
 576         ));
 577
 578         // ## Running LDK
 579         // Step 13: Initialize networking
 580
 581         let peer_manager_connection_handler = peer_manager.clone();
 582         let listening_port = args.ldk_peer_listening_port;
 583         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 584         let stop_listen = Arc::clone(&stop_listen_connect);
 585         tokio::spawn(async move {
 586                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 587                         .await
 588                         .expect("Failed to bind to listen port - is something else already listening on it?");
 589                 loop {
 590                         let peer_mgr = peer_manager_connection_handler.clone();
 591                         let tcp_stream = listener.accept().await.unwrap().0;
 592                         if stop_listen.load(Ordering::Acquire) {
 593                                 return;
 594                         }
 595                         tokio::spawn(async move {
 596                                 lightning_net_tokio::setup_inbound(
 597                                         peer_mgr.clone(),
 598                                         tcp_stream.into_std().unwrap(),
 599                                 )
 600                                 .await;
 601                         });
 602                 }
 603         });
 604
 605         // Step 14: Connect and Disconnect Blocks
 606         if chain_tip.is_none() {
 607                 chain_tip = Some(init::validate_best_block_header(bitcoind_client.as_ref()).await.unwrap());
 608         }
 609         let channel_manager_listener = channel_manager.clone();
 610         let chain_monitor_listener = chain_monitor.clone();
 611         let bitcoind_block_source = bitcoind_client.clone();
 612         let network = args.network;
 613         tokio::spawn(async move {
 614                 let chain_poller = poll::ChainPoller::new(bitcoind_block_source.as_ref(), network);
 615                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 616                 let mut spv_client =
 617                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 618                 loop {
 619                         spv_client.poll_best_tip().await.unwrap();
 620                         tokio::time::sleep(Duration::from_secs(1)).await;
 621                 }
 622         });
 623
 624         // Step 15: Handle LDK Events
 625         let channel_manager_event_listener = channel_manager.clone();
 626         let keys_manager_listener = keys_manager.clone();
 627         // TODO: persist payment info to disk
 628         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 629         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 630         let inbound_pmts_for_events = inbound_payments.clone();
 631         let outbound_pmts_for_events = outbound_payments.clone();
 632         let network = args.network;
 633         let bitcoind_rpc = bitcoind_client.clone();
 634         let network_graph_events = network_graph.clone();
 635         let handle = tokio::runtime::Handle::current();
 636         let event_handler = move |event: &Event| {
 637                 handle.block_on(handle_ldk_events(
 638                         &channel_manager_event_listener,
 639                         &bitcoind_rpc,
 640                         &network_graph_events,
 641                         &keys_manager_listener,
 642                         &inbound_pmts_for_events,
 643                         &outbound_pmts_for_events,
 644                         network,
 645                         event,
 646                 ));
 647         };
 648
 649         // Step 16: Initialize routing ProbabilisticScorer
 650         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 651         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 652                 Path::new(&scorer_path),
 653                 Arc::clone(&network_graph),
 654                 Arc::clone(&logger),
 655         )));
 656
 657         // Step 17: Create InvoicePayer
 658         let router = DefaultRouter::new(
 659                 network_graph.clone(),
 660                 logger.clone(),
 661                 keys_manager.get_secure_random_bytes(),
 662         );
 663         let invoice_payer = Arc::new(InvoicePayer::new(
 664                 channel_manager.clone(),
 665                 router,
 666                 scorer.clone(),
 667                 logger.clone(),
 668                 event_handler,
 669                 payment::Retry::Timeout(Duration::from_secs(10)),
 670         ));
 671
 672         // Step 18: Persist ChannelManager and NetworkGraph
 673         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 674
 675         // Step 19: Background Processing
 676         let background_processor = BackgroundProcessor::start(
 677                 persister,
 678                 invoice_payer.clone(),
 679                 chain_monitor.clone(),
 680                 channel_manager.clone(),
 681                 GossipSync::p2p(gossip_sync.clone()),
 682                 peer_manager.clone(),
 683                 logger.clone(),
 684                 Some(scorer.clone()),
 685         );
 686
 687         // Regularly reconnect to channel peers.
 688         let connect_cm = Arc::clone(&channel_manager);
 689         let connect_pm = Arc::clone(&peer_manager);
 690         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 691         let stop_connect = Arc::clone(&stop_listen_connect);
 692         tokio::spawn(async move {
 693                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 694                 loop {
 695                         interval.tick().await;
 696                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 697                                 Ok(info) => {
 698                                         let peers = connect_pm.get_peer_node_ids();
 699                                         for node_id in connect_cm
 700                                                 .list_channels()
 701                                                 .iter()
 702                                                 .map(|chan| chan.counterparty.node_id)
 703                                                 .filter(|id| !peers.contains(id))
 704                                         {
 705                                                 if stop_connect.load(Ordering::Acquire) {
 706                                                         return;
 707                                                 }
 708                                                 for (pubkey, peer_addr) in info.iter() {
 709                                                         if *pubkey == node_id {
 710                                                                 let _ = cli::do_connect_peer(
 711                                                                         *pubkey,
 712                                                                         peer_addr.clone(),
 713                                                                         Arc::clone(&connect_pm),
 714                                                                 )
 715                                                                 .await;
 716                                                         }
 717                                                 }
 718                                         }
 719                                 }
 720                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 721                         }
 722                 }
 723         });
 724
 725         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 726         // some public channels, and is only useful if we have public listen address(es) to announce.
 727         // In a production environment, this should occur only after the announcement of new channels
 728         // to avoid churn in the global network graph.
 729         let peer_man = Arc::clone(&peer_manager);
 730         let network = args.network;
 731         if !args.ldk_announced_listen_addr.is_empty() {
 732                 tokio::spawn(async move {
 733                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 734                         loop {
 735                                 interval.tick().await;
 736                                 peer_man.broadcast_node_announcement(
 737                                         [0; 3],
 738                                         args.ldk_announced_node_name,
 739                                         args.ldk_announced_listen_addr.clone(),
 740                                 );
 741                         }
 742                 });
 743         }
 744
 745         // Start the CLI.
 746         cli::poll_for_user_input(
 747                 Arc::clone(&invoice_payer),
 748                 Arc::clone(&peer_manager),
 749                 Arc::clone(&channel_manager),
 750                 Arc::clone(&keys_manager),
 751                 Arc::clone(&network_graph),
 752                 Arc::clone(&onion_messenger),
 753                 inbound_payments,
 754                 outbound_payments,
 755                 ldk_data_dir.clone(),
 756                 network,
 757         )
 758         .await;
 759
 760         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 761         // updating our channel data after we've stopped the background processor.
 762         stop_listen_connect.store(true, Ordering::Release);
 763         peer_manager.disconnect_all_peers();
 764
 765         // Stop the background processor.
 766         background_processor.stop().unwrap();
 767 }
 768
 769 #[tokio::main]
 770 pub async fn main() {
 771         start_ldk().await;
 772 }