_ 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 struct NodeAlias<'a>(&'a [u8; 32]);
 120
 121 impl fmt::Display for NodeAlias<'_> {
 122         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
 123                 let alias = self
 124                         .0
 125                         .iter()
 126                         .map(|b| *b as char)
 127                         .take_while(|c| *c != '\0')
 128                         .filter(|c| c.is_ascii_graphic() || *c == ' ')
 129                         .collect::<String>();
 130                 write!(f, "{}", alias)
 131         }
 132 }
 133
 134 async fn handle_ldk_events(
 135         channel_manager: Arc<ChannelManager>, bitcoind_client: Arc<BitcoindClient>,
 136         network_graph: Arc<NetworkGraph>, keys_manager: Arc<KeysManager>,
 137         inbound_payments: PaymentInfoStorage, outbound_payments: PaymentInfoStorage, network: Network,
 138         event: &Event,
 139 ) {
 140         match event {
 141                 Event::FundingGenerationReady {
 142                         temporary_channel_id,
 143                         counterparty_node_id,
 144                         channel_value_satoshis,
 145                         output_script,
 146                         ..
 147                 } => {
 148                         // Construct the raw transaction with one output, that is paid the amount of the
 149                         // channel.
 150                         let addr = WitnessProgram::from_scriptpubkey(
 151                                 &output_script[..],
 152                                 match network {
 153                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 154                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 155                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 156                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 157                                 },
 158                         )
 159                         .expect("Lightning funding tx should always be to a SegWit output")
 160                         .to_address();
 161                         let mut outputs = vec![HashMap::with_capacity(1)];
 162                         outputs[0].insert(addr, *channel_value_satoshis as f64 / 100_000_000.0);
 163                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 164
 165                         // Have your wallet put the inputs into the transaction such that the output is
 166                         // satisfied.
 167                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 168
 169                         // Sign the final funding transaction and broadcast it.
 170                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 171                         assert_eq!(signed_tx.complete, true);
 172                         let final_tx: Transaction =
 173                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 174                         // Give the funding transaction back to LDK for opening the channel.
 175                         if channel_manager
 176                                 .funding_transaction_generated(
 177                                         &temporary_channel_id,
 178                                         counterparty_node_id,
 179                                         final_tx,
 180                                 )
 181                                 .is_err()
 182                         {
 183                                 println!(
 184                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 185                                 print!("> ");
 186                                 io::stdout().flush().unwrap();
 187                         }
 188                 }
 189                 Event::PaymentReceived { payment_hash, purpose, amount_msat } => {
 190                         println!(
 191                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 192                                 hex_utils::hex_str(&payment_hash.0),
 193                                 amount_msat,
 194                         );
 195                         print!("> ");
 196                         io::stdout().flush().unwrap();
 197                         let payment_preimage = match purpose {
 198                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => *payment_preimage,
 199                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(*preimage),
 200                         };
 201                         channel_manager.claim_funds(payment_preimage.unwrap());
 202                 }
 203                 Event::PaymentClaimed { payment_hash, purpose, amount_msat } => {
 204                         println!(
 205                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 206                                 hex_utils::hex_str(&payment_hash.0),
 207                                 amount_msat,
 208                         );
 209                         print!("> ");
 210                         io::stdout().flush().unwrap();
 211                         let (payment_preimage, payment_secret) = match purpose {
 212                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 213                                         (*payment_preimage, Some(*payment_secret))
 214                                 }
 215                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(*preimage), None),
 216                         };
 217                         let mut payments = inbound_payments.lock().unwrap();
 218                         match payments.entry(*payment_hash) {
 219                                 Entry::Occupied(mut e) => {
 220                                         let payment = e.get_mut();
 221                                         payment.status = HTLCStatus::Succeeded;
 222                                         payment.preimage = payment_preimage;
 223                                         payment.secret = payment_secret;
 224                                 }
 225                                 Entry::Vacant(e) => {
 226                                         e.insert(PaymentInfo {
 227                                                 preimage: payment_preimage,
 228                                                 secret: payment_secret,
 229                                                 status: HTLCStatus::Succeeded,
 230                                                 amt_msat: MillisatAmount(Some(*amount_msat)),
 231                                         });
 232                                 }
 233                         }
 234                 }
 235                 Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
 236                         let mut payments = outbound_payments.lock().unwrap();
 237                         for (hash, payment) in payments.iter_mut() {
 238                                 if *hash == *payment_hash {
 239                                         payment.preimage = Some(*payment_preimage);
 240                                         payment.status = HTLCStatus::Succeeded;
 241                                         println!(
 242                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 243                                                                  payment hash {:?} with preimage {:?}",
 244                                                 payment.amt_msat,
 245                                                 if let Some(fee) = fee_paid_msat {
 246                                                         format!(" (fee {} msat)", fee)
 247                                                 } else {
 248                                                         "".to_string()
 249                                                 },
 250                                                 hex_utils::hex_str(&payment_hash.0),
 251                                                 hex_utils::hex_str(&payment_preimage.0)
 252                                         );
 253                                         print!("> ");
 254                                         io::stdout().flush().unwrap();
 255                                 }
 256                         }
 257                 }
 258                 Event::OpenChannelRequest { .. } => {
 259                         // Unreachable, we don't set manually_accept_inbound_channels
 260                 }
 261                 Event::PaymentPathSuccessful { .. } => {}
 262                 Event::PaymentPathFailed { .. } => {}
 263                 Event::PaymentFailed { payment_hash, .. } => {
 264                         print!(
 265                                 "\nEVENT: Failed to send payment to payment hash {:?}: exhausted payment retry attempts",
 266                                 hex_utils::hex_str(&payment_hash.0)
 267                         );
 268                         print!("> ");
 269                         io::stdout().flush().unwrap();
 270
 271                         let mut payments = outbound_payments.lock().unwrap();
 272                         if payments.contains_key(&payment_hash) {
 273                                 let payment = payments.get_mut(&payment_hash).unwrap();
 274                                 payment.status = HTLCStatus::Failed;
 275                         }
 276                 }
 277                 Event::PaymentForwarded {
 278                         prev_channel_id,
 279                         next_channel_id,
 280                         fee_earned_msat,
 281                         claim_from_onchain_tx,
 282                 } => {
 283                         let read_only_network_graph = network_graph.read_only();
 284                         let nodes = read_only_network_graph.nodes();
 285                         let channels = channel_manager.list_channels();
 286
 287                         let node_str = |channel_id: &Option<[u8; 32]>| match channel_id {
 288                                 None => String::new(),
 289                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 290                                         None => String::new(),
 291                                         Some(channel) => {
 292                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 293                                                         None => " from private node".to_string(),
 294                                                         Some(node) => match &node.announcement_info {
 295                                                                 None => " from unnamed node".to_string(),
 296                                                                 Some(announcement) => {
 297                                                                         format!(" from node {}", NodeAlias(&announcement.alias))
 298                                                                 }
 299                                                         },
 300                                                 }
 301                                         }
 302                                 },
 303                         };
 304                         let channel_str = |channel_id: &Option<[u8; 32]>| {
 305                                 channel_id
 306                                         .map(|channel_id| format!(" with channel {}", hex_utils::hex_str(&channel_id)))
 307                                         .unwrap_or_default()
 308                         };
 309                         let from_prev_str =
 310                                 format!("{}{}", node_str(prev_channel_id), channel_str(prev_channel_id));
 311                         let to_next_str =
 312                                 format!("{}{}", node_str(next_channel_id), channel_str(next_channel_id));
 313
 314                         let from_onchain_str = if *claim_from_onchain_tx {
 315                                 "from onchain downstream claim"
 316                         } else {
 317                                 "from HTLC fulfill message"
 318                         };
 319                         if let Some(fee_earned) = fee_earned_msat {
 320                                 println!(
 321                                         "\nEVENT: Forwarded payment{}{}, earning {} msat {}",
 322                                         from_prev_str, to_next_str, fee_earned, from_onchain_str
 323                                 );
 324                         } else {
 325                                 println!(
 326                                         "\nEVENT: Forwarded payment{}{}, claiming onchain {}",
 327                                         from_prev_str, to_next_str, from_onchain_str
 328                                 );
 329                         }
 330                         print!("> ");
 331                         io::stdout().flush().unwrap();
 332                 }
 333                 Event::PendingHTLCsForwardable { time_forwardable } => {
 334                         let forwarding_channel_manager = channel_manager.clone();
 335                         let min = time_forwardable.as_millis() as u64;
 336                         tokio::spawn(async move {
 337                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 338                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 339                                 forwarding_channel_manager.process_pending_htlc_forwards();
 340                         });
 341                 }
 342                 Event::SpendableOutputs { outputs } => {
 343                         let destination_address = bitcoind_client.get_new_address().await;
 344                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 345                         let tx_feerate =
 346                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 347                         let spending_tx = keys_manager
 348                                 .spend_spendable_outputs(
 349                                         output_descriptors,
 350                                         Vec::new(),
 351                                         destination_address.script_pubkey(),
 352                                         tx_feerate,
 353                                         &Secp256k1::new(),
 354                                 )
 355                                 .unwrap();
 356                         bitcoind_client.broadcast_transaction(&spending_tx);
 357                 }
 358                 Event::ChannelClosed { channel_id, reason, user_channel_id: _ } => {
 359                         println!(
 360                                 "\nEVENT: Channel {} closed due to: {:?}",
 361                                 hex_utils::hex_str(channel_id),
 362                                 reason
 363                         );
 364                         print!("> ");
 365                         io::stdout().flush().unwrap();
 366                 }
 367                 Event::DiscardFunding { .. } => {
 368                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 369                         // the funding transaction either confirms, or this event is generated.
 370                 }
 371         }
 372 }
 373
 374 async fn start_ldk() {
 375         let args = match cli::parse_startup_args() {
 376                 Ok(user_args) => user_args,
 377                 Err(()) => return,
 378         };
 379
 380         // Initialize the LDK data directory if necessary.
 381         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 382         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 383
 384         // Initialize our bitcoind client.
 385         let bitcoind_client = match BitcoindClient::new(
 386                 args.bitcoind_rpc_host.clone(),
 387                 args.bitcoind_rpc_port,
 388                 args.bitcoind_rpc_username.clone(),
 389                 args.bitcoind_rpc_password.clone(),
 390                 tokio::runtime::Handle::current(),
 391         )
 392         .await
 393         {
 394                 Ok(client) => Arc::new(client),
 395                 Err(e) => {
 396                         println!("Failed to connect to bitcoind client: {}", e);
 397                         return;
 398                 }
 399         };
 400
 401         // Check that the bitcoind we've connected to is running the network we expect
 402         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 403         if bitcoind_chain
 404                 != match args.network {
 405                         bitcoin::Network::Bitcoin => "main",
 406                         bitcoin::Network::Testnet => "test",
 407                         bitcoin::Network::Regtest => "regtest",
 408                         bitcoin::Network::Signet => "signet",
 409                 } {
 410                 println!(
 411                         "Chain argument ({}) didn't match bitcoind chain ({})",
 412                         args.network, bitcoind_chain
 413                 );
 414                 return;
 415         }
 416
 417         // ## Setup
 418         // Step 1: Initialize the FeeEstimator
 419
 420         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 421         let fee_estimator = bitcoind_client.clone();
 422
 423         // Step 2: Initialize the Logger
 424         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 425
 426         // Step 3: Initialize the BroadcasterInterface
 427
 428         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 429         // broadcaster.
 430         let broadcaster = bitcoind_client.clone();
 431
 432         // Step 4: Initialize Persist
 433         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 434
 435         // Step 5: Initialize the ChainMonitor
 436         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 437                 None,
 438                 broadcaster.clone(),
 439                 logger.clone(),
 440                 fee_estimator.clone(),
 441                 persister.clone(),
 442         ));
 443
 444         // Step 6: Initialize the KeysManager
 445
 446         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 447         // other secret key material.
 448         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 449         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 450                 assert_eq!(seed.len(), 32);
 451                 let mut key = [0; 32];
 452                 key.copy_from_slice(&seed);
 453                 key
 454         } else {
 455                 let mut key = [0; 32];
 456                 thread_rng().fill_bytes(&mut key);
 457                 match File::create(keys_seed_path.clone()) {
 458                         Ok(mut f) => {
 459                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 460                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 461                         }
 462                         Err(e) => {
 463                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 464                                 return;
 465                         }
 466                 }
 467                 key
 468         };
 469         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 470         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 471
 472         // Step 7: Read ChannelMonitor state from disk
 473         let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
 474
 475         // Step 8: Initialize the ChannelManager
 476         let mut user_config = UserConfig::default();
 477         user_config.peer_channel_config_limits.force_announced_channel_preference = false;
 478         let mut restarting_node = true;
 479         let (channel_manager_blockhash, channel_manager) = {
 480                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 481                         let mut channel_monitor_mut_references = Vec::new();
 482                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 483                                 channel_monitor_mut_references.push(channel_monitor);
 484                         }
 485                         let read_args = ChannelManagerReadArgs::new(
 486                                 keys_manager.clone(),
 487                                 fee_estimator.clone(),
 488                                 chain_monitor.clone(),
 489                                 broadcaster.clone(),
 490                                 logger.clone(),
 491                                 user_config,
 492                                 channel_monitor_mut_references,
 493                         );
 494                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 495                 } else {
 496                         // We're starting a fresh node.
 497                         restarting_node = false;
 498                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 499
 500                         let chain_params = ChainParameters {
 501                                 network: args.network,
 502                                 best_block: BestBlock::new(
 503                                         getinfo_resp.latest_blockhash,
 504                                         getinfo_resp.latest_height as u32,
 505                                 ),
 506                         };
 507                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 508                                 fee_estimator.clone(),
 509                                 chain_monitor.clone(),
 510                                 broadcaster.clone(),
 511                                 logger.clone(),
 512                                 keys_manager.clone(),
 513                                 user_config,
 514                                 chain_params,
 515                         );
 516                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 517                 }
 518         };
 519
 520         // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
 521         let mut chain_listener_channel_monitors = Vec::new();
 522         let mut cache = UnboundedCache::new();
 523         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 524         if restarting_node {
 525                 let mut chain_listeners =
 526                         vec![(channel_manager_blockhash, &channel_manager as &dyn chain::Listen)];
 527
 528                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 529                         let outpoint = channel_monitor.get_funding_txo().0;
 530                         chain_listener_channel_monitors.push((
 531                                 blockhash,
 532                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 533                                 outpoint,
 534                         ));
 535                 }
 536
 537                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 538                         chain_listeners
 539                                 .push((monitor_listener_info.0, &monitor_listener_info.1 as &dyn chain::Listen));
 540                 }
 541                 chain_tip = Some(
 542                         init::synchronize_listeners(
 543                                 &mut bitcoind_client.deref(),
 544                                 args.network,
 545                                 &mut cache,
 546                                 chain_listeners,
 547                         )
 548                         .await
 549                         .unwrap(),
 550                 );
 551         }
 552
 553         // Step 10: Give ChannelMonitors to ChainMonitor
 554         for item in chain_listener_channel_monitors.drain(..) {
 555                 let channel_monitor = item.1 .0;
 556                 let funding_outpoint = item.2;
 557                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 558         }
 559
 560         // Step 11: Optional: Initialize the P2PGossipSync
 561         let genesis = genesis_block(args.network).header.block_hash();
 562         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 563         let network_graph =
 564                 Arc::new(disk::read_network(Path::new(&network_graph_path), genesis, logger.clone()));
 565         let gossip_sync = Arc::new(P2PGossipSync::new(
 566                 Arc::clone(&network_graph),
 567                 None::<Arc<dyn chain::Access + Send + Sync>>,
 568                 logger.clone(),
 569         ));
 570
 571         // Step 12: Initialize the PeerManager
 572         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 573         let mut ephemeral_bytes = [0; 32];
 574         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 575         let lightning_msg_handler = MessageHandler {
 576                 chan_handler: channel_manager.clone(),
 577                 route_handler: gossip_sync.clone(),
 578         };
 579         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 580                 lightning_msg_handler,
 581                 keys_manager.get_node_secret(Recipient::Node).unwrap(),
 582                 &ephemeral_bytes,
 583                 logger.clone(),
 584                 Arc::new(IgnoringMessageHandler {}),
 585         ));
 586
 587         // ## Running LDK
 588         // Step 13: Initialize networking
 589
 590         let peer_manager_connection_handler = peer_manager.clone();
 591         let listening_port = args.ldk_peer_listening_port;
 592         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 593         let stop_listen = Arc::clone(&stop_listen_connect);
 594         tokio::spawn(async move {
 595                 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
 596                         .await
 597                         .expect("Failed to bind to listen port - is something else already listening on it?");
 598                 loop {
 599                         let peer_mgr = peer_manager_connection_handler.clone();
 600                         let tcp_stream = listener.accept().await.unwrap().0;
 601                         if stop_listen.load(Ordering::Acquire) {
 602                                 return;
 603                         }
 604                         tokio::spawn(async move {
 605                                 lightning_net_tokio::setup_inbound(
 606                                         peer_mgr.clone(),
 607                                         tcp_stream.into_std().unwrap(),
 608                                 )
 609                                 .await;
 610                         });
 611                 }
 612         });
 613
 614         // Step 14: Connect and Disconnect Blocks
 615         if chain_tip.is_none() {
 616                 chain_tip =
 617                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 618         }
 619         let channel_manager_listener = channel_manager.clone();
 620         let chain_monitor_listener = chain_monitor.clone();
 621         let bitcoind_block_source = bitcoind_client.clone();
 622         let network = args.network;
 623         tokio::spawn(async move {
 624                 let mut derefed = bitcoind_block_source.deref();
 625                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 626                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 627                 let mut spv_client =
 628                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 629                 loop {
 630                         spv_client.poll_best_tip().await.unwrap();
 631                         tokio::time::sleep(Duration::from_secs(1)).await;
 632                 }
 633         });
 634
 635         // Step 15: Handle LDK Events
 636         let channel_manager_event_listener = channel_manager.clone();
 637         let keys_manager_listener = keys_manager.clone();
 638         // TODO: persist payment info to disk
 639         let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 640         let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 641         let inbound_pmts_for_events = inbound_payments.clone();
 642         let outbound_pmts_for_events = outbound_payments.clone();
 643         let network = args.network;
 644         let bitcoind_rpc = bitcoind_client.clone();
 645         let network_graph_events = network_graph.clone();
 646         let handle = tokio::runtime::Handle::current();
 647         let event_handler = move |event: &Event| {
 648                 handle.block_on(handle_ldk_events(
 649                         channel_manager_event_listener.clone(),
 650                         bitcoind_rpc.clone(),
 651                         network_graph_events.clone(),
 652                         keys_manager_listener.clone(),
 653                         inbound_pmts_for_events.clone(),
 654                         outbound_pmts_for_events.clone(),
 655                         network,
 656                         event,
 657                 ));
 658         };
 659
 660         // Step 16: Initialize routing ProbabilisticScorer
 661         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 662         let scorer = Arc::new(Mutex::new(disk::read_scorer(
 663                 Path::new(&scorer_path),
 664                 Arc::clone(&network_graph),
 665                 Arc::clone(&logger),
 666         )));
 667
 668         // Step 17: Create InvoicePayer
 669         let router = DefaultRouter::new(
 670                 network_graph.clone(),
 671                 logger.clone(),
 672                 keys_manager.get_secure_random_bytes(),
 673         );
 674         let invoice_payer = Arc::new(InvoicePayer::new(
 675                 channel_manager.clone(),
 676                 router,
 677                 scorer.clone(),
 678                 logger.clone(),
 679                 event_handler,
 680                 payment::Retry::Attempts(5),
 681         ));
 682
 683         // Step 18: Persist ChannelManager and NetworkGraph
 684         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 685
 686         // Step 19: Background Processing
 687         let background_processor = BackgroundProcessor::start(
 688                 persister,
 689                 invoice_payer.clone(),
 690                 chain_monitor.clone(),
 691                 channel_manager.clone(),
 692                 GossipSync::P2P(gossip_sync.clone()),
 693                 peer_manager.clone(),
 694                 logger.clone(),
 695                 Some(scorer.clone()),
 696         );
 697
 698         // Regularly reconnect to channel peers.
 699         let connect_cm = Arc::clone(&channel_manager);
 700         let connect_pm = Arc::clone(&peer_manager);
 701         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 702         let stop_connect = Arc::clone(&stop_listen_connect);
 703         tokio::spawn(async move {
 704                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 705                 loop {
 706                         interval.tick().await;
 707                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 708                                 Ok(info) => {
 709                                         let peers = connect_pm.get_peer_node_ids();
 710                                         for node_id in connect_cm
 711                                                 .list_channels()
 712                                                 .iter()
 713                                                 .map(|chan| chan.counterparty.node_id)
 714                                                 .filter(|id| !peers.contains(id))
 715                                         {
 716                                                 if stop_connect.load(Ordering::Acquire) {
 717                                                         return;
 718                                                 }
 719                                                 for (pubkey, peer_addr) in info.iter() {
 720                                                         if *pubkey == node_id {
 721                                                                 let _ = cli::do_connect_peer(
 722                                                                         *pubkey,
 723                                                                         peer_addr.clone(),
 724                                                                         Arc::clone(&connect_pm),
 725                                                                 )
 726                                                                 .await;
 727                                                         }
 728                                                 }
 729                                         }
 730                                 }
 731                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 732                         }
 733                 }
 734         });
 735
 736         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
 737         // some public channels, and is only useful if we have public listen address(es) to announce.
 738         // In a production environment, this should occur only after the announcement of new channels
 739         // to avoid churn in the global network graph.
 740         let chan_manager = Arc::clone(&channel_manager);
 741         let network = args.network;
 742         if !args.ldk_announced_listen_addr.is_empty() {
 743                 tokio::spawn(async move {
 744                         let mut interval = tokio::time::interval(Duration::from_secs(60));
 745                         loop {
 746                                 interval.tick().await;
 747                                 chan_manager.broadcast_node_announcement(
 748                                         [0; 3],
 749                                         args.ldk_announced_node_name,
 750                                         args.ldk_announced_listen_addr.clone(),
 751                                 );
 752                         }
 753                 });
 754         }
 755
 756         // Start the CLI.
 757         cli::poll_for_user_input(
 758                 Arc::clone(&invoice_payer),
 759                 Arc::clone(&peer_manager),
 760                 Arc::clone(&channel_manager),
 761                 Arc::clone(&keys_manager),
 762                 Arc::clone(&network_graph),
 763                 inbound_payments,
 764                 outbound_payments,
 765                 ldk_data_dir.clone(),
 766                 network,
 767         )
 768         .await;
 769
 770         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
 771         // updating our channel data after we've stopped the background processor.
 772         stop_listen_connect.store(true, Ordering::Release);
 773         peer_manager.disconnect_all_peers();
 774
 775         // Stop the background processor.
 776         background_processor.stop().unwrap();
 777 }
 778
 779 #[tokio::main]
 780 pub async fn main() {
 781         start_ldk().await;
 782 }