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