_ 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::ops::Deref;
  52 use std::path::Path;
  53 use std::sync::atomic::{AtomicBool, Ordering};
  54 use std::sync::{Arc, Mutex};
  55 use std::time::{Duration, SystemTime};
  56
  57 pub(crate) enum HTLCStatus {
  58         Pending,
  59         Succeeded,
  60         Failed,
  61 }
  62
  63 pub(crate) struct MillisatAmount(Option<u64>);
  64
  65 impl fmt::Display for MillisatAmount {
  66         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  67                 match self.0 {
  68                         Some(amt) => write!(f, "{}", amt),
  69                         None => write!(f, "unknown"),
  70                 }
  71         }
  72 }
  73
  74 pub(crate) struct PaymentInfo {
  75         preimage: Option<PaymentPreimage>,
  76         secret: Option<PaymentSecret>,
  77         status: HTLCStatus,
  78         amt_msat: MillisatAmount,
  79 }
  80
  81 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
  82
  83 type ChainMonitor = chainmonitor::ChainMonitor<
  84         InMemorySigner,
  85         Arc<dyn Filter + Send + Sync>,
  86         Arc<BitcoindClient>,
  87         Arc<BitcoindClient>,
  88         Arc<FilesystemLogger>,
  89         Arc<FilesystemPersister>,
  90 >;
  91
  92 pub(crate) type PeerManager = SimpleArcPeerManager<
  93         SocketDescriptor,
  94         ChainMonitor,
  95         BitcoindClient,
  96         BitcoindClient,
  97         dyn chain::Access + Send + Sync,
  98         FilesystemLogger,
  99 >;
 100
 101 pub(crate) type ChannelManager =
 102         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 103
 104 pub(crate) type InvoicePayer<E> = payment::InvoicePayer<
 105         Arc<ChannelManager>,
 106         Router,
 107         Arc<Mutex<ProbabilisticScorer<Arc<NetworkGraph>, Arc<FilesystemLogger>>>>,
 108         Arc<FilesystemLogger>,
 109         E,
 110 >;
 111
 112 type Router = DefaultRouter<Arc<NetworkGraph>, Arc<FilesystemLogger>>;
 113
 114 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 115
 116 type OnionMessenger = SimpleArcOnionMessenger<FilesystemLogger>;
 117
 118 async fn handle_ldk_events(
 119         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 120         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 121         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 122         network: Network, event: &Event,
 123 ) {
 124         match event {
 125                 Event::FundingGenerationReady {
 126                         temporary_channel_id,
 127                         counterparty_node_id,
 128                         channel_value_satoshis,
 129                         output_script,
 130                         ..
 131                 } => {
 132                         // Construct the raw transaction with one output, that is paid the amount of the
 133                         // channel.
 134                         let addr = WitnessProgram::from_scriptpubkey(
 135                                 &output_script[..],
 136                                 match network {
 137                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 138                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 139                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 140                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 141                                 },
 142                         )
 143                         .expect("Lightning funding tx should always be to a SegWit output")
 144                         .to_address();
 145                         let mut outputs = vec![HashMap::with_capacity(1)];
 146                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 147                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 148
 149                         // Have your wallet put the inputs into the transaction such that the output is
 150                         // satisfied.
 151                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 152
 153                         // Sign the final funding transaction and broadcast it.
 154                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 155                         assert_eq!(signed_tx.complete, true);
 156                         let final_tx: Transaction =
 157                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 158                         // Give the funding transaction back to LDK for opening the channel.
 159                         if channel_manager
 160                                 .funding_transaction_generated(
 161                                         &temporary_channel_id,
 162                                         counterparty_node_id,
 163                                         final_tx,
 164                                 )
 165                                 .is_err()
 166                         {
 167                                 println!(
 168                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 169                                 print!("> ");
 170                                 io::stdout().flush().unwrap();
 171                         }
 172                 }
 173                 Event::PaymentReceived { payment_hash, purpose, amount_msat } => {
 174                         println!(
 175                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 176                                 hex_utils::hex_str(&payment_hash.0),
 177                                 amount_msat,
 178                         );
 179                         print!("> ");
 180                         io::stdout().flush().unwrap();
 181                         let payment_preimage = match purpose {
 182                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 183                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 184                         };
 185                         channel_manager.claim_funds(payment_preimage.unwrap());
 186                 }
 187                 Event::PaymentClaimed { payment_hash, purpose, amount_msat } => {
 188                         println!(
 189                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 190                                 hex_utils::hex_str(&payment_hash.0),
 191                                 amount_msat,
 192                         );
 193                         print!("> ");
 194                         io::stdout().flush().unwrap();
 195                         let (payment_preimage, payment_secret) = match purpose {
 196                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 197                                         (*payment_preimage, Some(*payment_secret))
 198                                 }
 199                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 200                         };
 201                         let mut payments = inbound_payments.lock().unwrap();
 202                         match payments.entry(*payment_hash) {
 203                                 Entry::Occupied(mut e) => {
 204                                         let payment = e.get_mut();
 205                                         payment.status = HTLCStatus::Succeeded;
 206                                         payment.preimage = payment_preimage;
 207                                         payment.secret = payment_secret;
 208                                 }
 209                                 Entry::Vacant(e) => {
 210                                         e.insert(PaymentInfo {
 211                                                 preimage: payment_preimage,
 212                                                 secret: payment_secret,
 213                                                 status: HTLCStatus::Succeeded,
 214                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 215                                         });
 216                                 }
 217                         }
 218                 }
 219                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 220                         let mut payments = outbound_payments.lock().unwrap();
 221                         for (hash, payment) in payments.iter_mut() {
 222                                 if *hash == *payment_hash {
 223                                         payment.preimage = Some(*payment_preimage);
 224                                         payment.status = HTLCStatus::Succeeded;
 225                                         println!(
 226                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 227                                                                  payment hash {:?} with preimage {:?}",
 228                                                 payment.amt_msat,
 229                                                 if let Some(fee) = fee_paid_msat {
 230                                                         format!(" (fee {} msat)", fee)
 231                                                 } else {
 232                                                         "".to_string()
 233                                                 },
 234                                                 hex_utils::hex_str(&payment_hash.0),
 235                                                 hex_utils::hex_str(&payment_preimage.0)
 236                                         );
 237                                         print!("> ");
 238                                         io::stdout().flush().unwrap();
 239                                 }
 240                         }
 241                 }
 242                 Event::OpenChannelRequest { .. } => {
 243                         // Unreachable, we don't set manually_accept_inbound_channels
 244                 }
 245                 Event::PaymentPathSuccessful { .. } => {}
 246                 Event::PaymentPathFailed { .. } => {}
 247                 Event::ProbeSuccessful { .. } => {}
 248                 Event::ProbeFailed { .. } => {}
 249                 Event::PaymentFailed { payment_hash, .. } => {
 250                         print!(
 251                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 252                                 hex_utils::hex_str(&payment_hash.0)
 253                         );
 254                         print!("> ");
 255                         io::stdout().flush().unwrap();
 256
 257                         let mut payments = outbound_payments.lock().unwrap();
 258                         if payments.contains_key(&payment_hash) {
 259                                 let payment = payments.get_mut(&payment_hash).unwrap();
 260                                 payment.status = HTLCStatus::Failed;
 261                         }
 262                 }
 263                 Event::PaymentForwarded {
 264                         prev_channel_id,
 265                         next_channel_id,
 266                         fee_earned_msat,
 267                         claim_from_onchain_tx,
 268                 } => {
 269                         let read_only_network_graph = network_graph.read_only();
 270                         let nodes = read_only_network_graph.nodes();
 271                         let channels = channel_manager.list_channels();
 272
 273                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 274                                 None => String::new(),
 275                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 276                                         None => String::new(),
 277                                         Some(channel) => {
 278                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 279                                                         None => "private node".to_string(),
 280                                                         Some(node) => match &node.announcement_info {
 281                                                                 None => "unnamed node".to_string(),
 282                                                                 Some(announcement) => {
 283                                                                         format!("node {}", announcement.alias)
 284                                                                 }
 285                                                         },
 286                                                 }
 287                                         }
 288                                 },
 289                         };
 290                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 291                                 channel_id
 292                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 293                                         .unwrap_or_default()
 294                         };
 295                         let from_prev_str =
 296                                 format!(" from {}{}", node_str(prev_channel_id), channel_str(prev_channel_id));
 297                         let to_next_str =
 298                                 format!(" to {}{}", node_str(next_channel_id), channel_str(next_channel_id));
 299
 300                         let from_onchain_str = if *claim_from_onchain_tx {
 301                                 "from onchain downstream claim"
 302                         } else {
 303                                 "from HTLC fulfill message"
 304                         };
 305                         if let Some(fee_earned) = fee_earned_msat {
 306                                 println!(
 307                                         "\nEVENT: Forwarded payment{}{}, earning {} msat {}",
 308                                         from_prev_str, to_next_str, fee_earned, from_onchain_str
 309                                 );
 310                         } else {
 311                                 println!(
 312                                         "\nEVENT: Forwarded payment{}{}, claiming onchain {}",
 313                                         from_prev_str, to_next_str, from_onchain_str
 314                                 );
 315                         }
 316                         print!("> ");
 317                         io::stdout().flush().unwrap();
 318                 }
 319                 Event::HTLCHandlingFailed { .. } => {}
 320                 Event::PendingHTLCsForwardable { time_forwardable } => {
 321                         let forwarding_channel_manager = channel_manager.clone();
 322                         let min = time_forwardable.as_millis() as u64;
 323                         tokio::spawn(async move {
 324                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 325                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 326                                 forwarding_channel_manager.process_pending_htlc_forwards();
 327                         });
 328                 }
 329                 Event::SpendableOutputs { outputs } => {
 330                         let destination_address = bitcoind_client.get_new_address().await;
 331                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 332                         let tx_feerate =
 333                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 334                         let spending_tx = keys_manager
 335                                 .spend_spendable_outputs(
 336                                         output_descriptors,
 337                                         Vec::new(),
 338                                         destination_address.script_pubkey(),
 339                                         tx_feerate,
 340                                         &Secp256k1::new(),
 341                                 )
 342                                 .unwrap();
 343                         bitcoind_client.broadcast_transaction(&spending_tx);
 344                 }
 345                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 346                         println!(
 347                                 "\nEVENT: Channel {} closed due to: {:?}",
 348                                 hex_utils::hex_str(channel_id),
 349                                 reason
 350                         );
 351                         print!("> ");
 352                         io::stdout().flush().unwrap();
 353                 }
 354                 Event::DiscardFunding { .. } => {
 355                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 356                         // the funding transaction either confirms, or this event is generated.
 357                 }
 358         }
 359 }
 360
 361 async fn start_ldk() {
 362         let args = match cli::parse_startup_args() {
 363                 Ok(user_args) => user_args,
 364                 Err(()) => return,
 365         };
 366
 367         // Initialize the LDK data directory if necessary.
 368         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 369         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 370
 371         // Initialize our bitcoind client.
 372         let bitcoind_client = match BitcoindClient::new(
 373                 args.bitcoind_rpc_host.clone(),
 374                 args.bitcoind_rpc_port,
 375                 args.bitcoind_rpc_username.clone(),
 376                 args.bitcoind_rpc_password.clone(),
 377                 tokio::runtime::Handle::current(),
 378         )
 379         .await
 380         {
 381                 Ok(client) => Arc::new(client),
 382                 Err(e) => {
 383                         println!("Failed to connect to bitcoind client: {}", e);
 384                         return;
 385                 }
 386         };
 387
 388         // Check that the bitcoind we've connected to is running the network we expect
 389         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 390         if bitcoind_chain
 391                 != match args.network {
 392                         bitcoin::Network::Bitcoin => "main",
 393                         bitcoin::Network::Testnet => "test",
 394                         bitcoin::Network::Regtest => "regtest",
 395                         bitcoin::Network::Signet => "signet",
 396                 } {
 397                 println!(
 398                         "Chain argument ({}) didn't match bitcoind chain ({})",
 399                         args.network, bitcoind_chain
 400                 );
 401                 return;
 402         }
 403
 404         // ## Setup
 405         // Step 1: Initialize the FeeEstimator
 406
 407         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 408         let fee_estimator = bitcoind_client.clone();
 409
 410         // Step 2: Initialize the Logger
 411         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 412
 413         // Step 3: Initialize the BroadcasterInterface
 414
 415         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 416         // broadcaster.
 417         let broadcaster = bitcoind_client.clone();
 418
 419         // Step 4: Initialize Persist
 420         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 421
 422         // Step 5: Initialize the ChainMonitor
 423         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 424                 None,
 425                 broadcaster.clone(),
 426                 logger.clone(),
 427                 fee_estimator.clone(),
 428                 persister.clone(),
 429         ));
 430
 431         // Step 6: Initialize the KeysManager
 432
 433         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 434         // other secret key material.
 435         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 436         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 437                 assert_eq!(seed.len(), 32);
 438                 let mut key = [0; 32];
 439                 key.copy_from_slice(&seed);
 440                 key
 441         } else {
 442                 let mut key = [0; 32];
 443                 thread_rng().fill_bytes(&mut key);
 444                 match File::create(keys_seed_path.clone()) {
 445                         Ok(mut f) => {
 446                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 447                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 448                         }
 449                         Err(e) => {
 450                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 451                                 return;
 452                         }
 453                 }
 454                 key
 455         };
 456         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 457         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 458
 459         // Step 7: Read ChannelMonitor state from disk
 460         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 461
 462         // Step 8: Initialize the ChannelManager
 463         let mut user_config = UserConfig::default();
 464         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 465         let mut restarting_node = true;
 466         let (channel_manager_blockhash, channel_manager) = {
 467                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 468                         let mut channel_monitor_mut_references = Vec::new();
 469                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 470                                 channel_monitor_mut_references.push(channel_monitor);
 471                         }
 472                         let read_args = ChannelManagerReadArgs::new(
 473                                 keys_manager.clone(),
 474                                 fee_estimator.clone(),
 475                                 chain_monitor.clone(),
 476                                 broadcaster.clone(),
 477                                 logger.clone(),
 478                                 user_config,
 479                                 channel_monitor_mut_references,
 480                         );
 481                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 482                 } else {
 483                         // We're starting a fresh node.
 484                         restarting_node = false;
 485                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 486
 487                         let chain_params = ChainParameters {
 488                                 network: args.network,
 489                                 best_block: BestBlock::new(
 490                                         getinfo_resp.latest_blockhash,
 491                                         getinfo_resp.latest_height as u32,
 492                                 ),
 493                         };
 494                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 495                                 fee_estimator.clone(),
 496                                 chain_monitor.clone(),
 497                                 broadcaster.clone(),
 498                                 logger.clone(),
 499                                 keys_manager.clone(),
 500                                 user_config,
 501                                 chain_params,
 502                         );
 503                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 504                 }
 505         };
 506
 507         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 508         let mut chain_listener_channel_monitors = Vec::new();
 509         let mut cache = UnboundedCache::new();
 510         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 511         if restarting_node {
 512                 let mut chain_listeners =
 513                         vec![(channel_manager_blockhash, &channel_manager as &dyn chain::Listen)];
 514
 515                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 516                         let outpoint = channel_monitor.get_funding_txo().0;
 517                         chain_listener_channel_monitors.push((
 518                                 blockhash,
 519                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 520                                 outpoint,
 521                         ));
 522                 }
 523
 524                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 525                         chain_listeners
 526                                 .push((monitor_listener_info.0, &monitor_listener_info.1 as &dyn chain::Listen));
 527                 }
 528                 chain_tip = Some(
 529                         init::synchronize_listeners(
 530                                 &mut bitcoind_client.deref(),
 531                                 args.network,
 532                                 &mut cache,
 533                                 chain_listeners,
 534                         )
 535                         .await
 536                         .unwrap(),
 537                 );
 538         }
 539
 540         // Step 10: Give ChannelMonitors to ChainMonitor
 541         for item in chain_listener_channel_monitors.drain(..) {
 542                 let channel_monitor = item.1 .0;
 543                 let funding_outpoint = item.2;
 544                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 545         }
 546
 547         // Step 11: Optional: Initialize the P2PGossipSync
 548         let genesis = genesis_block(args.network).header.block_hash();
 549         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 550         let network_graph =
 551                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 552         let gossip_sync = Arc::new(P2PGossipSync::new(
 553                 Arc::clone(&network_graph),
 554                 None::<Arc<dyn chain::Access + Send + Sync>>,
 555                 logger.clone(),
 556         ));
 557
 558         // Step 12: Initialize the PeerManager
 559         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 560         let onion_messenger: Arc<OnionMessenger> =
 561                 Arc::new(OnionMessenger::new(keys_manager.clone(), logger.clone()));
 562         let mut ephemeral_bytes = [0; 32];
 563         let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 564         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 565         let lightning_msg_handler = MessageHandler {
 566                 chan_handler: channel_manager.clone(),
 567                 route_handler: gossip_sync.clone(),
 568                 onion_message_handler: onion_messenger.clone(),
 569         };
 570         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 571                 lightning_msg_handler,
 572                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 573                 current_time,
 574                 &ephemeral_bytes,
 575                 logger.clone(),
 576                 IgnoringMessageHandler {},
 577         ));
 578
 579         // ## Running LDK
 580         // Step 13: Initialize networking
 581
 582         let peer_manager_connection_handler = peer_manager.clone();
 583         let listening_port = args.ldk_peer_listening_port;
 584         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 585         let stop_listen = Arc::clone(&stop_listen_connect);
 586         tokio::spawn(async move {
 587                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 588                         .await
 589                         .expect("Failed to bind to listen port - is something else already listening on it?");
 590                 loop {
 591                         let peer_mgr = peer_manager_connection_handler.clone();
 592                         let tcp_stream = listener.accept().await.unwrap().0;
 593                         if stop_listen.load(Ordering::Acquire) {
 594                                 return;
 595                         }
 596                         tokio::spawn(async move {
 597                                 lightning_net_tokio::setup_inbound(
 598                                         peer_mgr.clone(),
 599                                         tcp_stream.into_std().unwrap(),
 600                                 )
 601                                 .await;
 602                         });
 603                 }
 604         });
 605
 606         // Step 14: Connect and Disconnect Blocks
 607         if chain_tip.is_none() {
 608                 chain_tip =
 609                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 610         }
 611         let channel_manager_listener = channel_manager.clone();
 612         let chain_monitor_listener = chain_monitor.clone();
 613         let bitcoind_block_source = bitcoind_client.clone();
 614         let network = args.network;
 615         tokio::spawn(async move {
 616                 let mut derefed = bitcoind_block_source.deref();
 617                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 618                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 619                 let mut spv_client =
 620                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 621                 loop {
 622                         spv_client.poll_best_tip().await.unwrap();
 623                         tokio::time::sleep(Duration::from_secs(1)).await;
 624                 }
 625         });
 626
 627         // Step 15: Handle LDK Events
 628         let channel_manager_event_listener = channel_manager.clone();
 629         let keys_manager_listener = keys_manager.clone();
 630         // TODO: persist payment info to disk
 631         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 632         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 633         let inbound_pmts_for_events = inbound_payments.clone();
 634         let outbound_pmts_for_events = outbound_payments.clone();
 635         let network = args.network;
 636         let bitcoind_rpc = bitcoind_client.clone();
 637         let network_graph_events = network_graph.clone();
 638         let handle = tokio::runtime::Handle::current();
 639         let event_handler = move |event: &Event| {
 640                 handle.block_on(handle_ldk_events(
 641                         &channel_manager_event_listener,
 642                         &bitcoind_rpc,
 643                         &network_graph_events,
 644                         &keys_manager_listener,
 645                         &inbound_pmts_for_events,
 646                         &outbound_pmts_for_events,
 647                         network,
 648                         event,
 649                 ));
 650         };
 651
 652         // Step 16: Initialize routing ProbabilisticScorer
 653         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 654         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 655                 Path::new(&scorer_path),
 656                 Arc::clone(&network_graph),
 657                 Arc::clone(&logger),
 658         )));
 659
 660         // Step 17: Create InvoicePayer
 661         let router = DefaultRouter::new(
 662                 network_graph.clone(),
 663                 logger.clone(),
 664                 keys_manager.get_secure_random_bytes(),
 665         );
 666         let invoice_payer = Arc::new(InvoicePayer::new(
 667                 channel_manager.clone(),
 668                 router,
 669                 scorer.clone(),
 670                 logger.clone(),
 671                 event_handler,
 672                 payment::Retry::Timeout(Duration::from_secs(10)),
 673         ));
 674
 675         // Step 18: Persist ChannelManager and NetworkGraph
 676         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 677
 678         // Step 19: Background Processing
 679         let background_processor = BackgroundProcessor::start(
 680                 persister,
 681                 invoice_payer.clone(),
 682                 chain_monitor.clone(),
 683                 channel_manager.clone(),
 684                 GossipSync::p2p(gossip_sync.clone()),
 685                 peer_manager.clone(),
 686                 logger.clone(),
 687                 Some(scorer.clone()),
 688         );
 689
 690         // Regularly reconnect to channel peers.
 691         let connect_cm = Arc::clone(&channel_manager);
 692         let connect_pm = Arc::clone(&peer_manager);
 693         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 694         let stop_connect = Arc::clone(&stop_listen_connect);
 695         tokio::spawn(async move {
 696                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 697                 loop {
 698                         interval.tick().await;
 699                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 700                                 Ok(info) => {
 701                                         let peers = connect_pm.get_peer_node_ids();
 702                                         for node_id in connect_cm
 703                                                 .list_channels()
 704                                                 .iter()
 705                                                 .map(|chan| chan.counterparty.node_id)
 706                                                 .filter(|id| !peers.contains(id))
 707                                         {
 708                                                 if stop_connect.load(Ordering::Acquire) {
 709                                                         return;
 710                                                 }
 711                                                 for (pubkey, peer_addr) in info.iter() {
 712                                                         if *pubkey == node_id {
 713                                                                 let _ = cli::do_connect_peer(
 714                                                                         *pubkey,
 715                                                                         peer_addr.clone(),
 716                                                                         Arc::clone(&connect_pm),
 717                                                                 )
 718                                                                 .await;
 719                                                         }
 720                                                 }
 721                                         }
 722                                 }
 723                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 724                         }
 725                 }
 726         });
 727
 728         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 729         // some public channels, and is only useful if we have public listen address(es) to announce.
 730         // In a production environment, this should occur only after the announcement of new channels
 731         // to avoid churn in the global network graph.
 732         let peer_man = Arc::clone(&peer_manager);
 733         let network = args.network;
 734         if !args.ldk_announced_listen_addr.is_empty() {
 735                 tokio::spawn(async move {
 736                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 737                         loop {
 738                                 interval.tick().await;
 739                                 peer_man.broadcast_node_announcement(
 740                                         [0; 3],
 741                                         args.ldk_announced_node_name,
 742                                         args.ldk_announced_listen_addr.clone(),
 743                                 );
 744                         }
 745                 });
 746         }
 747
 748         // Start the CLI.
 749         cli::poll_for_user_input(
 750                 Arc::clone(&invoice_payer),
 751                 Arc::clone(&peer_manager),
 752                 Arc::clone(&channel_manager),
 753                 Arc::clone(&keys_manager),
 754                 Arc::clone(&network_graph),
 755                 Arc::clone(&onion_messenger),
 756                 inbound_payments,
 757                 outbound_payments,
 758                 ldk_data_dir.clone(),
 759                 network,
 760         )
 761         .await;
 762
 763         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 764         // updating our channel data after we've stopped the background processor.
 765         stop_listen_connect.store(true, Ordering::Release);
 766         peer_manager.disconnect_all_peers();
 767
 768         // Stop the background processor.
 769         background_processor.stop().unwrap();
 770 }
 771
 772 #[tokio::main]
 773 pub async fn main() {
 774         start_ldk().await;
 775 }