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