_ 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;
  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 lightning_rapid_gossip_sync::RapidGossipSync;
  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 type GossipSync<P, G, A, L> =
 115         lightning_background_processor::GossipSync<P, Arc<RapidGossipSync<G, L>>, G, A, L>;
 116
 117 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 118
 119 async fn handle_ldk_events(
 120         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 121         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 122         inbound_payments: &PaymentInfoStorage, outbound_payments: &PaymentInfoStorage,
 123         network: Network, event: &Event,
 124 ) {
 125         match event {
 126                 Event::FundingGenerationReady {
 127                         temporary_channel_id,
 128                         counterparty_node_id,
 129                         channel_value_satoshis,
 130                         output_script,
 131                         ..
 132                 } => {
 133                         // Construct the raw transaction with one output, that is paid the amount of the
 134                         // channel.
 135                         let addr = WitnessProgram::from_scriptpubkey(
 136                                 &output_script[..],
 137                                 match network {
 138                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 139                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 140                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 141                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 142                                 },
 143                         )
 144                         .expect("Lightning funding tx should always be to a SegWit output")
 145                         .to_address();
 146                         let mut outputs = vec![HashMap::with_capacity(1)];
 147                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 148                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 149
 150                         // Have your wallet put the inputs into the transaction such that the output is
 151                         // satisfied.
 152                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 153
 154                         // Sign the final funding transaction and broadcast it.
 155                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 156                         assert_eq!(signed_tx.complete, true);
 157                         let final_tx: Transaction =
 158                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 159                         // Give the funding transaction back to LDK for opening the channel.
 160                         if channel_manager
 161                                 .funding_transaction_generated(
 162                                         &temporary_channel_id,
 163                                         counterparty_node_id,
 164                                         final_tx,
 165                                 )
 166                                 .is_err()
 167                         {
 168                                 println!(
 169                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 170                                 print!("> ");
 171                                 io::stdout().flush().unwrap();
 172                         }
 173                 }
 174                 Event::PaymentReceived { payment_hash, purpose, amount_msat } => {
 175                         println!(
 176                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 177                                 hex_utils::hex_str(&payment_hash.0),
 178                                 amount_msat,
 179                         );
 180                         print!("> ");
 181                         io::stdout().flush().unwrap();
 182                         let payment_preimage = match purpose {
 183                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 184                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 185                         };
 186                         channel_manager.claim_funds(payment_preimage.unwrap());
 187                 }
 188                 Event::PaymentClaimed { payment_hash, purpose, amount_msat } => {
 189                         println!(
 190                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 191                                 hex_utils::hex_str(&payment_hash.0),
 192                                 amount_msat,
 193                         );
 194                         print!("> ");
 195                         io::stdout().flush().unwrap();
 196                         let (payment_preimage, payment_secret) = match purpose {
 197                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 198                                         (*payment_preimage, Some(*payment_secret))
 199                                 }
 200                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 201                         };
 202                         let mut payments = inbound_payments.lock().unwrap();
 203                         match payments.entry(*payment_hash) {
 204                                 Entry::Occupied(mut e) => {
 205                                         let payment = e.get_mut();
 206                                         payment.status = HTLCStatus::Succeeded;
 207                                         payment.preimage = payment_preimage;
 208                                         payment.secret = payment_secret;
 209                                 }
 210                                 Entry::Vacant(e) => {
 211                                         e.insert(PaymentInfo {
 212                                                 preimage: payment_preimage,
 213                                                 secret: payment_secret,
 214                                                 status: HTLCStatus::Succeeded,
 215                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 216                                         });
 217                                 }
 218                         }
 219                 }
 220                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 221                         let mut payments = outbound_payments.lock().unwrap();
 222                         for (hash, payment) in payments.iter_mut() {
 223                                 if *hash == *payment_hash {
 224                                         payment.preimage = Some(*payment_preimage);
 225                                         payment.status = HTLCStatus::Succeeded;
 226                                         println!(
 227                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 228                                                                  payment hash {:?} with preimage {:?}",
 229                                                 payment.amt_msat,
 230                                                 if let Some(fee) = fee_paid_msat {
 231                                                         format!(" (fee {} msat)", fee)
 232                                                 } else {
 233                                                         "".to_string()
 234                                                 },
 235                                                 hex_utils::hex_str(&payment_hash.0),
 236                                                 hex_utils::hex_str(&payment_preimage.0)
 237                                         );
 238                                         print!("> ");
 239                                         io::stdout().flush().unwrap();
 240                                 }
 241                         }
 242                 }
 243                 Event::OpenChannelRequest { .. } => {
 244                         // Unreachable, we don't set manually_accept_inbound_channels
 245                 }
 246                 Event::PaymentPathSuccessful { .. } => {}
 247                 Event::PaymentPathFailed { .. } => {}
 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::PendingHTLCsForwardable { time_forwardable } => {
 319                         let forwarding_channel_manager = channel_manager.clone();
 320                         let min = time_forwardable.as_millis() as u64;
 321                         tokio::spawn(async move {
 322                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 323                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 324                                 forwarding_channel_manager.process_pending_htlc_forwards();
 325                         });
 326                 }
 327                 Event::SpendableOutputs { outputs } => {
 328                         let destination_address = bitcoind_client.get_new_address().await;
 329                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 330                         let tx_feerate =
 331                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 332                         let spending_tx = keys_manager
 333                                 .spend_spendable_outputs(
 334                                         output_descriptors,
 335                                         Vec::new(),
 336                                         destination_address.script_pubkey(),
 337                                         tx_feerate,
 338                                         &Secp256k1::new(),
 339                                 )
 340                                 .unwrap();
 341                         bitcoind_client.broadcast_transaction(&spending_tx);
 342                 }
 343                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 344                         println!(
 345                                 "\nEVENT: Channel {} closed due to: {:?}",
 346                                 hex_utils::hex_str(channel_id),
 347                                 reason
 348                         );
 349                         print!("> ");
 350                         io::stdout().flush().unwrap();
 351                 }
 352                 Event::DiscardFunding { .. } => {
 353                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 354                         // the funding transaction either confirms, or this event is generated.
 355                 }
 356         }
 357 }
 358
 359 async fn start_ldk() {
 360         let args = match cli::parse_startup_args() {
 361                 Ok(user_args) => user_args,
 362                 Err(()) => return,
 363         };
 364
 365         // Initialize the LDK data directory if necessary.
 366         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 367         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 368
 369         // Initialize our bitcoind client.
 370         let bitcoind_client = match BitcoindClient::new(
 371                 args.bitcoind_rpc_host.clone(),
 372                 args.bitcoind_rpc_port,
 373                 args.bitcoind_rpc_username.clone(),
 374                 args.bitcoind_rpc_password.clone(),
 375                 tokio::runtime::Handle::current(),
 376         )
 377         .await
 378         {
 379                 Ok(client) => Arc::new(client),
 380                 Err(e) => {
 381                         println!("Failed to connect to bitcoind client: {}", e);
 382                         return;
 383                 }
 384         };
 385
 386         // Check that the bitcoind we've connected to is running the network we expect
 387         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 388         if bitcoind_chain
 389                 != match args.network {
 390                         bitcoin::Network::Bitcoin => "main",
 391                         bitcoin::Network::Testnet => "test",
 392                         bitcoin::Network::Regtest => "regtest",
 393                         bitcoin::Network::Signet => "signet",
 394                 } {
 395                 println!(
 396                         "Chain argument ({}) didn't match bitcoind chain ({})",
 397                         args.network, bitcoind_chain
 398                 );
 399                 return;
 400         }
 401
 402         // ## Setup
 403         // Step 1: Initialize the FeeEstimator
 404
 405         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 406         let fee_estimator = bitcoind_client.clone();
 407
 408         // Step 2: Initialize the Logger
 409         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 410
 411         // Step 3: Initialize the BroadcasterInterface
 412
 413         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 414         // broadcaster.
 415         let broadcaster = bitcoind_client.clone();
 416
 417         // Step 4: Initialize Persist
 418         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 419
 420         // Step 5: Initialize the ChainMonitor
 421         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 422                 None,
 423                 broadcaster.clone(),
 424                 logger.clone(),
 425                 fee_estimator.clone(),
 426                 persister.clone(),
 427         ));
 428
 429         // Step 6: Initialize the KeysManager
 430
 431         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 432         // other secret key material.
 433         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 434         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 435                 assert_eq!(seed.len(), 32);
 436                 let mut key = [0; 32];
 437                 key.copy_from_slice(&seed);
 438                 key
 439         } else {
 440                 let mut key = [0; 32];
 441                 thread_rng().fill_bytes(&mut key);
 442                 match File::create(keys_seed_path.clone()) {
 443                         Ok(mut f) => {
 444                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 445                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 446                         }
 447                         Err(e) => {
 448                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 449                                 return;
 450                         }
 451                 }
 452                 key
 453         };
 454         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 455         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 456
 457         // Step 7: Read ChannelMonitor state from disk
 458         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 459
 460         // Step 8: Initialize the ChannelManager
 461         let mut user_config = UserConfig::default();
 462         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 463         let mut restarting_node = true;
 464         let (channel_manager_blockhash, channel_manager) = {
 465                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 466                         let mut channel_monitor_mut_references = Vec::new();
 467                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 468                                 channel_monitor_mut_references.push(channel_monitor);
 469                         }
 470                         let read_args = ChannelManagerReadArgs::new(
 471                                 keys_manager.clone(),
 472                                 fee_estimator.clone(),
 473                                 chain_monitor.clone(),
 474                                 broadcaster.clone(),
 475                                 logger.clone(),
 476                                 user_config,
 477                                 channel_monitor_mut_references,
 478                         );
 479                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 480                 } else {
 481                         // We're starting a fresh node.
 482                         restarting_node = false;
 483                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 484
 485                         let chain_params = ChainParameters {
 486                                 network: args.network,
 487                                 best_block: BestBlock::new(
 488                                         getinfo_resp.latest_blockhash,
 489                                         getinfo_resp.latest_height as u32,
 490                                 ),
 491                         };
 492                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 493                                 fee_estimator.clone(),
 494                                 chain_monitor.clone(),
 495                                 broadcaster.clone(),
 496                                 logger.clone(),
 497                                 keys_manager.clone(),
 498                                 user_config,
 499                                 chain_params,
 500                         );
 501                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 502                 }
 503         };
 504
 505         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 506         let mut chain_listener_channel_monitors = Vec::new();
 507         let mut cache = UnboundedCache::new();
 508         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 509         if restarting_node {
 510                 let mut chain_listeners =
 511                         vec![(channel_manager_blockhash, &channel_manager as &dyn chain::Listen)];
 512
 513                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 514                         let outpoint = channel_monitor.get_funding_txo().0;
 515                         chain_listener_channel_monitors.push((
 516                                 blockhash,
 517                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 518                                 outpoint,
 519                         ));
 520                 }
 521
 522                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 523                         chain_listeners
 524                                 .push((monitor_listener_info.0, &monitor_listener_info.1 as &dyn chain::Listen));
 525                 }
 526                 chain_tip = Some(
 527                         init::synchronize_listeners(
 528                                 &mut bitcoind_client.deref(),
 529                                 args.network,
 530                                 &mut cache,
 531                                 chain_listeners,
 532                         )
 533                         .await
 534                         .unwrap(),
 535                 );
 536         }
 537
 538         // Step 10: Give ChannelMonitors to ChainMonitor
 539         for item in chain_listener_channel_monitors.drain(..) {
 540                 let channel_monitor = item.1 .0;
 541                 let funding_outpoint = item.2;
 542                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 543         }
 544
 545         // Step 11: Optional: Initialize the P2PGossipSync
 546         let genesis = genesis_block(args.network).header.block_hash();
 547         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 548         let network_graph =
 549                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 550         let gossip_sync = Arc::new(P2PGossipSync::new(
 551                 Arc::clone(&network_graph),
 552                 None::<Arc<dyn chain::Access + Send + Sync>>,
 553                 logger.clone(),
 554         ));
 555
 556         // Step 12: Initialize the PeerManager
 557         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 558         let mut ephemeral_bytes = [0; 32];
 559         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 560         let lightning_msg_handler = MessageHandler {
 561                 chan_handler: channel_manager.clone(),
 562                 route_handler: gossip_sync.clone(),
 563         };
 564         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 565                 lightning_msg_handler,
 566                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 567                 &ephemeral_bytes,
 568                 logger.clone(),
 569                 Arc::new(IgnoringMessageHandler {}),
 570         ));
 571
 572         // ## Running LDK
 573         // Step 13: Initialize networking
 574
 575         let peer_manager_connection_handler = peer_manager.clone();
 576         let listening_port = args.ldk_peer_listening_port;
 577         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 578         let stop_listen = Arc::clone(&stop_listen_connect);
 579         tokio::spawn(async move {
 580                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 581                         .await
 582                         .expect("Failed to bind to listen port - is something else already listening on it?");
 583                 loop {
 584                         let peer_mgr = peer_manager_connection_handler.clone();
 585                         let tcp_stream = listener.accept().await.unwrap().0;
 586                         if stop_listen.load(Ordering::Acquire) {
 587                                 return;
 588                         }
 589                         tokio::spawn(async move {
 590                                 lightning_net_tokio::setup_inbound(
 591                                         peer_mgr.clone(),
 592                                         tcp_stream.into_std().unwrap(),
 593                                 )
 594                                 .await;
 595                         });
 596                 }
 597         });
 598
 599         // Step 14: Connect and Disconnect Blocks
 600         if chain_tip.is_none() {
 601                 chain_tip =
 602                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 603         }
 604         let channel_manager_listener = channel_manager.clone();
 605         let chain_monitor_listener = chain_monitor.clone();
 606         let bitcoind_block_source = bitcoind_client.clone();
 607         let network = args.network;
 608         tokio::spawn(async move {
 609                 let mut derefed = bitcoind_block_source.deref();
 610                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 611                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 612                 let mut spv_client =
 613                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 614                 loop {
 615                         spv_client.poll_best_tip().await.unwrap();
 616                         tokio::time::sleep(Duration::from_secs(1)).await;
 617                 }
 618         });
 619
 620         // Step 15: Handle LDK Events
 621         let channel_manager_event_listener = channel_manager.clone();
 622         let keys_manager_listener = keys_manager.clone();
 623         // TODO: persist payment info to disk
 624         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 625         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 626         let inbound_pmts_for_events = inbound_payments.clone();
 627         let outbound_pmts_for_events = outbound_payments.clone();
 628         let network = args.network;
 629         let bitcoind_rpc = bitcoind_client.clone();
 630         let network_graph_events = network_graph.clone();
 631         let handle = tokio::runtime::Handle::current();
 632         let event_handler = move |event: &Event| {
 633                 handle.block_on(handle_ldk_events(
 634                         &channel_manager_event_listener,
 635                         &bitcoind_rpc,
 636                         &network_graph_events,
 637                         &keys_manager_listener,
 638                         &inbound_pmts_for_events,
 639                         &outbound_pmts_for_events,
 640                         network,
 641                         event,
 642                 ));
 643         };
 644
 645         // Step 16: Initialize routing ProbabilisticScorer
 646         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 647         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 648                 Path::new(&scorer_path),
 649                 Arc::clone(&network_graph),
 650                 Arc::clone(&logger),
 651         )));
 652
 653         // Step 17: Create InvoicePayer
 654         let router = DefaultRouter::new(
 655                 network_graph.clone(),
 656                 logger.clone(),
 657                 keys_manager.get_secure_random_bytes(),
 658         );
 659         let invoice_payer = Arc::new(InvoicePayer::new(
 660                 channel_manager.clone(),
 661                 router,
 662                 scorer.clone(),
 663                 logger.clone(),
 664                 event_handler,
 665                 payment::Retry::Timeout(Duration::from_secs(10)),
 666         ));
 667
 668         // Step 18: Persist ChannelManager and NetworkGraph
 669         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 670
 671         // Step 19: Background Processing
 672         let background_processor = BackgroundProcessor::start(
 673                 persister,
 674                 invoice_payer.clone(),
 675                 chain_monitor.clone(),
 676                 channel_manager.clone(),
 677                 GossipSync::P2P(gossip_sync.clone()),
 678                 peer_manager.clone(),
 679                 logger.clone(),
 680                 Some(scorer.clone()),
 681         );
 682
 683         // Regularly reconnect to channel peers.
 684         let connect_cm = Arc::clone(&channel_manager);
 685         let connect_pm = Arc::clone(&peer_manager);
 686         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 687         let stop_connect = Arc::clone(&stop_listen_connect);
 688         tokio::spawn(async move {
 689                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 690                 loop {
 691                         interval.tick().await;
 692                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 693                                 Ok(info) => {
 694                                         let peers = connect_pm.get_peer_node_ids();
 695                                         for node_id in connect_cm
 696                                                 .list_channels()
 697                                                 .iter()
 698                                                 .map(|chan| chan.counterparty.node_id)
 699                                                 .filter(|id| !peers.contains(id))
 700                                         {
 701                                                 if stop_connect.load(Ordering::Acquire) {
 702                                                         return;
 703                                                 }
 704                                                 for (pubkey, peer_addr) in info.iter() {
 705                                                         if *pubkey == node_id {
 706                                                                 let _ = cli::do_connect_peer(
 707                                                                         *pubkey,
 708                                                                         peer_addr.clone(),
 709                                                                         Arc::clone(&connect_pm),
 710                                                                 )
 711                                                                 .await;
 712                                                         }
 713                                                 }
 714                                         }
 715                                 }
 716                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 717                         }
 718                 }
 719         });
 720
 721         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 722         // some public channels, and is only useful if we have public listen address(es) to announce.
 723         // In a production environment, this should occur only after the announcement of new channels
 724         // to avoid churn in the global network graph.
 725         let chan_manager = Arc::clone(&channel_manager);
 726         let network = args.network;
 727         if !args.ldk_announced_listen_addr.is_empty() {
 728                 tokio::spawn(async move {
 729                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 730                         loop {
 731                                 interval.tick().await;
 732                                 chan_manager.broadcast_node_announcement(
 733                                         [0; 3],
 734                                         args.ldk_announced_node_name,
 735                                         args.ldk_announced_listen_addr.clone(),
 736                                 );
 737                         }
 738                 });
 739         }
 740
 741         // Start the CLI.
 742         cli::poll_for_user_input(
 743                 Arc::clone(&invoice_payer),
 744                 Arc::clone(&peer_manager),
 745                 Arc::clone(&channel_manager),
 746                 Arc::clone(&keys_manager),
 747                 Arc::clone(&network_graph),
 748                 inbound_payments,
 749                 outbound_payments,
 750                 ldk_data_dir.clone(),
 751                 network,
 752         )
 753         .await;
 754
 755         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 756         // updating our channel data after we've stopped the background processor.
 757         stop_listen_connect.store(true, Ordering::Release);
 758         peer_manager.disconnect_all_peers();
 759
 760         // Stop the background processor.
 761         background_processor.stop().unwrap();
 762 }
 763
 764 #[tokio::main]
 765 pub async fn main() {
 766         start_ldk().await;
 767 }