_ Git - ldk-sample/blob - src/main.rs

   1 mod args;
   2 pub mod bitcoind_client;
   3 mod cli;
   4 mod convert;
   5 mod disk;
   6 mod hex_utils;
   7 mod sweep;
   8
   9 use crate::bitcoind_client::BitcoindClient;
  10 use crate::disk::FilesystemLogger;
  11 use bitcoin::blockdata::transaction::Transaction;
  12 use bitcoin::consensus::encode;
  13 use bitcoin::network::constants::Network;
  14 use bitcoin::BlockHash;
  15 use bitcoin::secp256k1::PublicKey;
  16 use bitcoin_bech32::WitnessProgram;
  17 use disk::{INBOUND_PAYMENTS_FNAME, OUTBOUND_PAYMENTS_FNAME};
  18 use lightning::chain::{chainmonitor, ChannelMonitorUpdateStatus};
  19 use lightning::chain::{Filter, Watch};
  20 use lightning::events::bump_transaction::{BumpTransactionEventHandler, Wallet};
  21 use lightning::events::{Event, PaymentFailureReason, PaymentPurpose};
  22 use lightning::ln::channelmanager::{self, RecentPaymentDetails};
  23 use lightning::ln::channelmanager::{
  24         ChainParameters, ChannelManagerReadArgs, PaymentId, SimpleArcChannelManager,
  25 };
  26 use lightning::ln::msgs::DecodeError;
  27 use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler, SimpleArcPeerManager};
  28 use lightning::ln::{ChannelId, PaymentHash, PaymentPreimage, PaymentSecret};
  29 use lightning::onion_message::{DefaultMessageRouter, SimpleArcOnionMessenger};
  30 use lightning::routing::gossip;
  31 use lightning::routing::gossip::{NodeId, P2PGossipSync};
  32 use lightning::routing::router::{DefaultRouter, RouteParameters, PaymentParameters, ScorerAccountingForInFlightHtlcs};
  33 use lightning::routing::scoring::ProbabilisticScoringFeeParameters;
  34 use lightning::routing::scoring::ProbabilisticScorer;
  35 use lightning::sign::{EntropySource, InMemorySigner, KeysManager, SpendableOutputDescriptor};
  36 use lightning::util::config::UserConfig;
  37 use lightning::util::persist::{self, KVStore, MonitorUpdatingPersister};
  38 use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
  39 use lightning::{chain, impl_writeable_tlv_based, impl_writeable_tlv_based_enum};
  40 use lightning_background_processor::{process_events_async, GossipSync};
  41 use lightning_block_sync::init;
  42 use lightning_block_sync::poll;
  43 use lightning_block_sync::SpvClient;
  44 use lightning_block_sync::UnboundedCache;
  45 use lightning_net_tokio::SocketDescriptor;
  46 use lightning_persister::fs_store::FilesystemStore;
  47 use rand::{thread_rng, Rng};
  48 use std::collections::hash_map::Entry;
  49 use std::collections::HashMap;
  50 use std::convert::TryInto;
  51 use std::fmt;
  52 use std::fs;
  53 use std::fs::File;
  54 use std::io;
  55 use std::io::Write;
  56 use std::path::Path;
  57 use std::sync::atomic::{AtomicBool, Ordering};
  58 use std::sync::{Arc, Mutex, RwLock};
  59 use std::time::{Duration, SystemTime};
  60
  61 pub(crate) const PENDING_SPENDABLE_OUTPUT_DIR: &'static str = "pending_spendable_outputs";
  62
  63 #[derive(Copy, Clone)]
  64 pub(crate) enum HTLCStatus {
  65         Pending,
  66         Succeeded,
  67         Failed,
  68 }
  69
  70 impl_writeable_tlv_based_enum!(HTLCStatus,
  71         (0, Pending) => {},
  72         (1, Succeeded) => {},
  73         (2, Failed) => {};
  74 );
  75
  76 pub(crate) struct MillisatAmount(Option<u64>);
  77
  78 impl fmt::Display for MillisatAmount {
  79         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  80                 match self.0 {
  81                         Some(amt) => write!(f, "{}", amt),
  82                         None => write!(f, "unknown"),
  83                 }
  84         }
  85 }
  86
  87 impl Readable for MillisatAmount {
  88         fn read<R: io::Read>(r: &mut R) -> Result<Self, DecodeError> {
  89                 let amt: Option<u64> = Readable::read(r)?;
  90                 Ok(MillisatAmount(amt))
  91         }
  92 }
  93
  94 impl Writeable for MillisatAmount {
  95         fn write<W: Writer>(&self, w: &mut W) -> Result<(), std::io::Error> {
  96                 self.0.write(w)
  97         }
  98 }
  99
 100 pub(crate) struct PaymentInfo {
 101         preimage: Option<PaymentPreimage>,
 102         secret: Option<PaymentSecret>,
 103         status: HTLCStatus,
 104         amt_msat: MillisatAmount,
 105 }
 106
 107 impl_writeable_tlv_based!(PaymentInfo, {
 108         (0, preimage, required),
 109         (2, secret, required),
 110         (4, status, required),
 111         (6, amt_msat, required),
 112 });
 113
 114 pub(crate) struct InboundPaymentInfoStorage {
 115         payments: HashMap<PaymentHash, PaymentInfo>,
 116 }
 117
 118 impl_writeable_tlv_based!(InboundPaymentInfoStorage, {
 119         (0, payments, required),
 120 });
 121
 122 pub(crate) struct OutboundPaymentInfoStorage {
 123         payments: HashMap<PaymentId, PaymentInfo>,
 124 }
 125
 126 impl_writeable_tlv_based!(OutboundPaymentInfoStorage, {
 127         (0, payments, required),
 128 });
 129
 130 type ChainMonitor = chainmonitor::ChainMonitor<
 131         InMemorySigner,
 132         Arc<dyn Filter + Send + Sync>,
 133         Arc<BitcoindClient>,
 134         Arc<BitcoindClient>,
 135         Arc<FilesystemLogger>,
 136         Arc<
 137                 MonitorUpdatingPersister<
 138                         Arc<FilesystemStore>,
 139                         Arc<FilesystemLogger>,
 140                         Arc<KeysManager>,
 141                         Arc<KeysManager>,
 142                 >,
 143         >,
 144 >;
 145
 146 pub(crate) type GossipVerifier = lightning_block_sync::gossip::GossipVerifier<
 147         lightning_block_sync::gossip::TokioSpawner,
 148         Arc<lightning_block_sync::rpc::RpcClient>,
 149         Arc<FilesystemLogger>,
 150         SocketDescriptor,
 151         Arc<ChannelManager>,
 152         Arc<OnionMessenger>,
 153         IgnoringMessageHandler,
 154         Arc<KeysManager>,
 155 >;
 156
 157 pub(crate) type PeerManager = SimpleArcPeerManager<
 158         SocketDescriptor,
 159         ChainMonitor,
 160         BitcoindClient,
 161         BitcoindClient,
 162         GossipVerifier,
 163         FilesystemLogger,
 164 >;
 165
 166 pub(crate) type ChannelManager =
 167         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 168
 169 pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
 170
 171 type OnionMessenger =
 172         SimpleArcOnionMessenger<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 173
 174 pub(crate) type BumpTxEventHandler = BumpTransactionEventHandler<
 175         Arc<BitcoindClient>,
 176         Arc<Wallet<Arc<BitcoindClient>, Arc<FilesystemLogger>>>,
 177         Arc<KeysManager>,
 178         Arc<FilesystemLogger>,
 179 >;
 180
 181 fn send_rand_probe(
 182         channel_manager: &ChannelManager, graph: &NetworkGraph,
 183         logger: &disk::FilesystemLogger,
 184         scorer: &RwLock<ProbabilisticScorer<Arc<NetworkGraph>, Arc<disk::FilesystemLogger>>>
 185 ) {
 186         let rcpt = {
 187                 let lck = graph.read_only();
 188                 if lck.nodes().is_empty() { return; }
 189                 let mut it = lck.nodes().unordered_iter().skip(::rand::random::<usize>() % lck.nodes().len());
 190                 it.next().unwrap().0.clone()
 191         };
 192         let amt = ::rand::random::<u64>() % 500_000_000;
 193         if let Ok(pk) = bitcoin::secp256k1::PublicKey::from_slice(rcpt.as_slice()) {
 194                 send_probe(channel_manager, pk, graph, logger, amt, scorer);
 195         }
 196 }
 197
 198 fn send_probe(
 199         channel_manager: &ChannelManager, recipient: PublicKey, graph: &NetworkGraph,
 200         logger: &disk::FilesystemLogger, amt_msat: u64,
 201         scorer: &RwLock<ProbabilisticScorer<Arc<NetworkGraph>, Arc<disk::FilesystemLogger>>>
 202 ) {
 203         let chans = channel_manager.list_usable_channels();
 204         let chan_refs = chans.iter().map(|a| a).collect::<Vec<_>>();
 205         let mut payment_params = PaymentParameters::from_node_id(recipient, 144);
 206         payment_params.max_path_count = 1;
 207         let in_flight_htlcs = channel_manager.compute_inflight_htlcs();
 208         let scorer = scorer.read().unwrap();
 209         let inflight_scorer = ScorerAccountingForInFlightHtlcs::new(&scorer, &in_flight_htlcs);
 210         let score_params: ProbabilisticScoringFeeParameters = Default::default();
 211         let route_res = lightning::routing::router::find_route(
 212                 &channel_manager.get_our_node_id(),
 213                 &RouteParameters::from_payment_params_and_value(payment_params, amt_msat),
 214                 &graph, Some(&chan_refs), logger, &inflight_scorer, &score_params, &[32; 32]
 215         );
 216         if let Ok(route) = route_res {
 217                 for path in route.paths {
 218                         let _ = channel_manager.send_probe(path);
 219                 }
 220         }
 221 }
 222
 223 async fn handle_ldk_events(
 224         channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
 225         network_graph: &NetworkGraph, keys_manager: &KeysManager,
 226         bump_tx_event_handler: &BumpTxEventHandler,
 227         inbound_payments: Arc<Mutex<InboundPaymentInfoStorage>>,
 228         outbound_payments: Arc<Mutex<OutboundPaymentInfoStorage>>, fs_store: &Arc<FilesystemStore>,
 229         network: Network, event: Event,
 230 ) {
 231         match event {
 232                 Event::FundingGenerationReady {
 233                         temporary_channel_id,
 234                         counterparty_node_id,
 235                         channel_value_satoshis,
 236                         output_script,
 237                         ..
 238                 } => {
 239                         // Construct the raw transaction with one output, that is paid the amount of the
 240                         // channel.
 241                         let addr = WitnessProgram::from_scriptpubkey(
 242                                 &output_script[..],
 243                                 match network {
 244                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 245                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 246                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 247                                         Network::Signet => bitcoin_bech32::constants::Network::Signet,
 248                                 },
 249                         )
 250                         .expect("Lightning funding tx should always be to a SegWit output")
 251                         .to_address();
 252                         let mut outputs = vec![HashMap::with_capacity(1)];
 253                         outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
 254                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 255
 256                         // Have your wallet put the inputs into the transaction such that the output is
 257                         // satisfied.
 258                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 259
 260                         // Sign the final funding transaction and broadcast it.
 261                         let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 262                         assert_eq!(signed_tx.complete, true);
 263                         let final_tx: Transaction =
 264                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 265                         // Give the funding transaction back to LDK for opening the channel.
 266                         if channel_manager
 267                                 .funding_transaction_generated(
 268                                         &temporary_channel_id,
 269                                         &counterparty_node_id,
 270                                         final_tx,
 271                                 )
 272                                 .is_err()
 273                         {
 274                                 println!(
 275                                         "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
 276                                 print!("> ");
 277                                 io::stdout().flush().unwrap();
 278                         }
 279                 }
 280                 Event::PaymentClaimable {
 281                         payment_hash,
 282                         purpose,
 283                         amount_msat,
 284                         receiver_node_id: _,
 285                         via_channel_id: _,
 286                         via_user_channel_id: _,
 287                         claim_deadline: _,
 288                         onion_fields: _,
 289                         counterparty_skimmed_fee_msat: _,
 290                 } => {
 291                         println!(
 292                                 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
 293                                 payment_hash, amount_msat,
 294                         );
 295                         print!("> ");
 296                         io::stdout().flush().unwrap();
 297                         let payment_preimage = match purpose {
 298                                 PaymentPurpose::InvoicePayment { payment_preimage, .. } => payment_preimage,
 299                                 PaymentPurpose::SpontaneousPayment(preimage) => Some(preimage),
 300                         };
 301                         channel_manager.claim_funds(payment_preimage.unwrap());
 302                 }
 303                 Event::PaymentClaimed {
 304                         payment_hash,
 305                         purpose,
 306                         amount_msat,
 307                         receiver_node_id: _,
 308                         htlcs: _,
 309                         sender_intended_total_msat: _,
 310                 } => {
 311                         println!(
 312                                 "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
 313                                 payment_hash, amount_msat,
 314                         );
 315                         print!("> ");
 316                         io::stdout().flush().unwrap();
 317                         let (payment_preimage, payment_secret) = match purpose {
 318                                 PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
 319                                         (payment_preimage, Some(payment_secret))
 320                                 }
 321                                 PaymentPurpose::SpontaneousPayment(preimage) => (Some(preimage), None),
 322                         };
 323                         let mut inbound = inbound_payments.lock().unwrap();
 324                         match inbound.payments.entry(payment_hash) {
 325                                 Entry::Occupied(mut e) => {
 326                                         let payment = e.get_mut();
 327                                         payment.status = HTLCStatus::Succeeded;
 328                                         payment.preimage = payment_preimage;
 329                                         payment.secret = payment_secret;
 330                                 }
 331                                 Entry::Vacant(e) => {
 332                                         e.insert(PaymentInfo {
 333                                                 preimage: payment_preimage,
 334                                                 secret: payment_secret,
 335                                                 status: HTLCStatus::Succeeded,
 336                                                 amt_msat: MillisatAmount(Some(amount_msat)),
 337                                         });
 338                                 }
 339                         }
 340                         fs_store.write("", "", INBOUND_PAYMENTS_FNAME, &inbound.encode()).unwrap();
 341                 }
 342                 Event::PaymentSent {
 343                         payment_preimage, payment_hash, fee_paid_msat, payment_id, ..
 344                 } => {
 345                         let mut outbound = outbound_payments.lock().unwrap();
 346                         for (id, payment) in outbound.payments.iter_mut() {
 347                                 if *id == payment_id.unwrap() {
 348                                         payment.preimage = Some(payment_preimage);
 349                                         payment.status = HTLCStatus::Succeeded;
 350                                         println!(
 351                                                 "\nEVENT: successfully sent payment of {} millisatoshis{} from \
 352                                                                  payment hash {} with preimage {}",
 353                                                 payment.amt_msat,
 354                                                 if let Some(fee) = fee_paid_msat {
 355                                                         format!(" (fee {} msat)", fee)
 356                                                 } else {
 357                                                         "".to_string()
 358                                                 },
 359                                                 payment_hash,
 360                                                 payment_preimage
 361                                         );
 362                                         print!("> ");
 363                                         io::stdout().flush().unwrap();
 364                                 }
 365                         }
 366                         fs_store.write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound.encode()).unwrap();
 367                 }
 368                 Event::OpenChannelRequest {
 369                         ref temporary_channel_id, ref counterparty_node_id, ..
 370                 } => {
 371                         let mut random_bytes = [0u8; 16];
 372                         random_bytes.copy_from_slice(&keys_manager.get_secure_random_bytes()[..16]);
 373                         let user_channel_id = u128::from_be_bytes(random_bytes);
 374                         let res = channel_manager.accept_inbound_channel(
 375                                 temporary_channel_id,
 376                                 counterparty_node_id,
 377                                 user_channel_id,
 378                         );
 379
 380                         if let Err(e) = res {
 381                                 print!(
 382                                         "\nEVENT: Failed to accept inbound channel ({}) from {}: {:?}",
 383                                         temporary_channel_id,
 384                                         hex_utils::hex_str(&counterparty_node_id.serialize()),
 385                                         e,
 386                                 );
 387                         } else {
 388                                 print!(
 389                                         "\nEVENT: Accepted inbound channel ({}) from {}",
 390                                         temporary_channel_id,
 391                                         hex_utils::hex_str(&counterparty_node_id.serialize()),
 392                                 );
 393                         }
 394                         print!("> ");
 395                         io::stdout().flush().unwrap();
 396                 }
 397                 Event::PaymentPathSuccessful { .. } => {}
 398                 Event::PaymentPathFailed { .. } => {}
 399                 Event::ProbeSuccessful { .. } => {}
 400                 Event::ProbeFailed { .. } => {}
 401                 Event::PaymentFailed { payment_hash, reason, payment_id, .. } => {
 402                         print!(
 403                                 "\nEVENT: Failed to send payment to payment hash {}: {:?}",
 404                                 payment_hash,
 405                                 if let Some(r) = reason { r } else { PaymentFailureReason::RetriesExhausted }
 406                         );
 407                         print!("> ");
 408                         io::stdout().flush().unwrap();
 409
 410                         let mut outbound = outbound_payments.lock().unwrap();
 411                         if outbound.payments.contains_key(&payment_id) {
 412                                 let payment = outbound.payments.get_mut(&payment_id).unwrap();
 413                                 payment.status = HTLCStatus::Failed;
 414                         }
 415                         fs_store.write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound.encode()).unwrap();
 416                 }
 417                 Event::InvoiceRequestFailed { payment_id } => {
 418                         print!("\nEVENT: Failed to request invoice to send payment with id {}", payment_id);
 419                         print!("> ");
 420                         io::stdout().flush().unwrap();
 421
 422                         let mut outbound = outbound_payments.lock().unwrap();
 423                         if outbound.payments.contains_key(&payment_id) {
 424                                 let payment = outbound.payments.get_mut(&payment_id).unwrap();
 425                                 payment.status = HTLCStatus::Failed;
 426                         }
 427                         fs_store.write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound.encode()).unwrap();
 428                 }
 429                 Event::PaymentForwarded {
 430                         prev_channel_id,
 431                         next_channel_id,
 432                         fee_earned_msat,
 433                         claim_from_onchain_tx,
 434                         outbound_amount_forwarded_msat,
 435                 } => {
 436                         let read_only_network_graph = network_graph.read_only();
 437                         let nodes = read_only_network_graph.nodes();
 438                         let channels = channel_manager.list_channels();
 439
 440                         let node_str = |channel_id: &Option<ChannelId>| match channel_id {
 441                                 None => String::new(),
 442                                 Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
 443                                         None => String::new(),
 444                                         Some(channel) => {
 445                                                 match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
 446                                                         None => "private node".to_string(),
 447                                                         Some(node) => match &node.announcement_info {
 448                                                                 None => "unnamed node".to_string(),
 449                                                                 Some(announcement) => {
 450                                                                         format!("node {}", announcement.alias)
 451                                                                 }
 452                                                         },
 453                                                 }
 454                                         }
 455                                 },
 456                         };
 457                         let channel_str = |channel_id: &Option<ChannelId>| {
 458                                 channel_id
 459                                         .map(|channel_id| format!(" with channel {}", channel_id))
 460                                         .unwrap_or_default()
 461                         };
 462                         let from_prev_str =
 463                                 format!(" from {}{}", node_str(&prev_channel_id), channel_str(&prev_channel_id));
 464                         let to_next_str =
 465                                 format!(" to {}{}", node_str(&next_channel_id), channel_str(&next_channel_id));
 466
 467                         let from_onchain_str = if claim_from_onchain_tx {
 468                                 "from onchain downstream claim"
 469                         } else {
 470                                 "from HTLC fulfill message"
 471                         };
 472                         let amt_args = if let Some(v) = outbound_amount_forwarded_msat {
 473                                 format!("{}", v)
 474                         } else {
 475                                 "?".to_string()
 476                         };
 477                         if let Some(fee_earned) = fee_earned_msat {
 478                                 println!(
 479                                         "\nEVENT: Forwarded payment for {} msat{}{}, earning {} msat {}",
 480                                         amt_args, from_prev_str, to_next_str, fee_earned, from_onchain_str
 481                                 );
 482                         } else {
 483                                 println!(
 484                                         "\nEVENT: Forwarded payment for {} msat{}{}, claiming onchain {}",
 485                                         amt_args, from_prev_str, to_next_str, from_onchain_str
 486                                 );
 487                         }
 488                         print!("> ");
 489                         io::stdout().flush().unwrap();
 490                 }
 491                 Event::HTLCHandlingFailed { .. } => {}
 492                 Event::PendingHTLCsForwardable { time_forwardable } => {
 493                         let forwarding_channel_manager = channel_manager.clone();
 494                         let min = time_forwardable.as_millis() as u64;
 495                         tokio::spawn(async move {
 496                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 497                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 498                                 forwarding_channel_manager.process_pending_htlc_forwards();
 499                         });
 500                 }
 501                 Event::SpendableOutputs { outputs, channel_id: _ } => {
 502                         // SpendableOutputDescriptors, of which outputs is a vec of, are critical to keep track
 503                         // of! While a `StaticOutput` descriptor is just an output to a static, well-known key,
 504                         // other descriptors are not currently ever regenerated for you by LDK. Once we return
 505                         // from this method, the descriptor will be gone, and you may lose track of some funds.
 506                         //
 507                         // Here we simply persist them to disk, with a background task running which will try
 508                         // to spend them regularly (possibly duplicatively/RBF'ing them). These can just be
 509                         // treated as normal funds where possible - they are only spendable by us and there is
 510                         // no rush to claim them.
 511                         for output in outputs {
 512                                 let key = hex_utils::hex_str(&keys_manager.get_secure_random_bytes());
 513                                 // Note that if the type here changes our read code needs to change as well.
 514                                 let output: SpendableOutputDescriptor = output;
 515                                 fs_store.write(PENDING_SPENDABLE_OUTPUT_DIR, "", &key, &output.encode()).unwrap();
 516                         }
 517                 }
 518                 Event::ChannelPending { channel_id, counterparty_node_id, .. } => {
 519                         println!(
 520                                 "\nEVENT: Channel {} with peer {} is pending awaiting funding lock-in!",
 521                                 channel_id,
 522                                 hex_utils::hex_str(&counterparty_node_id.serialize()),
 523                         );
 524                         print!("> ");
 525                         io::stdout().flush().unwrap();
 526                 }
 527                 Event::ChannelReady {
 528                         ref channel_id,
 529                         user_channel_id: _,
 530                         ref counterparty_node_id,
 531                         channel_type: _,
 532                 } => {
 533                         println!(
 534                                 "\nEVENT: Channel {} with peer {} is ready to be used!",
 535                                 channel_id,
 536                                 hex_utils::hex_str(&counterparty_node_id.serialize()),
 537                         );
 538                         print!("> ");
 539                         io::stdout().flush().unwrap();
 540                 }
 541                 Event::ChannelClosed {
 542                         channel_id,
 543                         reason,
 544                         user_channel_id: _,
 545                         counterparty_node_id,
 546                         channel_capacity_sats: _,
 547                 } => {
 548                         println!(
 549                                 "\nEVENT: Channel {} with counterparty {} closed due to: {:?}",
 550                                 channel_id,
 551                                 counterparty_node_id.map(|id| format!("{}", id)).unwrap_or("".to_owned()),
 552                                 reason
 553                         );
 554                         print!("> ");
 555                         io::stdout().flush().unwrap();
 556                 }
 557                 Event::DiscardFunding { .. } => {
 558                         // A "real" node should probably "lock" the UTXOs spent in funding transactions until
 559                         // the funding transaction either confirms, or this event is generated.
 560                 }
 561                 Event::HTLCIntercepted { .. } => {}
 562                 Event::BumpTransaction(event) => bump_tx_event_handler.handle_event(&event),
 563         }
 564 }
 565
 566 async fn start_ldk() {
 567         let args = match args::parse_startup_args() {
 568                 Ok(user_args) => user_args,
 569                 Err(()) => return,
 570         };
 571
 572         // Initialize the LDK data directory if necessary.
 573         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 574         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 575
 576         // ## Setup
 577         // Step 1: Initialize the Logger
 578         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 579
 580         // Initialize our bitcoind client.
 581         let bitcoind_client = match BitcoindClient::new(
 582                 args.bitcoind_rpc_host.clone(),
 583                 args.bitcoind_rpc_port,
 584                 args.bitcoind_rpc_username.clone(),
 585                 args.bitcoind_rpc_password.clone(),
 586                 tokio::runtime::Handle::current(),
 587                 Arc::clone(&logger),
 588         )
 589         .await
 590         {
 591                 Ok(client) => Arc::new(client),
 592                 Err(e) => {
 593                         println!("Failed to connect to bitcoind client: {}", e);
 594                         return;
 595                 }
 596         };
 597
 598         // Check that the bitcoind we've connected to is running the network we expect
 599         let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
 600         if bitcoind_chain
 601                 != match args.network {
 602                         bitcoin::Network::Bitcoin => "main",
 603                         bitcoin::Network::Testnet => "test",
 604                         bitcoin::Network::Regtest => "regtest",
 605                         bitcoin::Network::Signet => "signet",
 606                 } {
 607                 println!(
 608                         "Chain argument ({}) didn't match bitcoind chain ({})",
 609                         args.network, bitcoind_chain
 610                 );
 611                 return;
 612         }
 613
 614         // Step 2: Initialize the FeeEstimator
 615
 616         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 617         let fee_estimator = bitcoind_client.clone();
 618
 619         // Step 3: Initialize the BroadcasterInterface
 620
 621         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 622         // broadcaster.
 623         let broadcaster = bitcoind_client.clone();
 624
 625         // Step 4: Initialize the KeysManager
 626
 627         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 628         // other secret key material.
 629         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 630         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 631                 assert_eq!(seed.len(), 32);
 632                 let mut key = [0; 32];
 633                 key.copy_from_slice(&seed);
 634                 key
 635         } else {
 636                 let mut key = [0; 32];
 637                 thread_rng().fill_bytes(&mut key);
 638                 match File::create(keys_seed_path.clone()) {
 639                         Ok(mut f) => {
 640                                 Write::write_all(&mut f, &key).expect("Failed to write node keys seed to disk");
 641                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 642                         }
 643                         Err(e) => {
 644                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 645                                 return;
 646                         }
 647                 }
 648                 key
 649         };
 650         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 651         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 652
 653         let bump_tx_event_handler = Arc::new(BumpTransactionEventHandler::new(
 654                 Arc::clone(&broadcaster),
 655                 Arc::new(Wallet::new(Arc::clone(&bitcoind_client), Arc::clone(&logger))),
 656                 Arc::clone(&keys_manager),
 657                 Arc::clone(&logger),
 658         ));
 659
 660         // Step 5: Initialize Persistence
 661         let fs_store = Arc::new(FilesystemStore::new(ldk_data_dir.clone().into()));
 662         let persister = Arc::new(MonitorUpdatingPersister::new(
 663                 Arc::clone(&fs_store),
 664                 Arc::clone(&logger),
 665                 1000,
 666                 Arc::clone(&keys_manager),
 667                 Arc::clone(&keys_manager),
 668         ));
 669         // Alternatively, you can use the `FilesystemStore` as a `Persist` directly, at the cost of
 670         // larger `ChannelMonitor` update writes (but no deletion or cleanup):
 671         //let persister = Arc::clone(&fs_store);
 672
 673         // Step 6: Initialize the ChainMonitor
 674         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 675                 None,
 676                 Arc::clone(&broadcaster),
 677                 Arc::clone(&logger),
 678                 Arc::clone(&fee_estimator),
 679                 Arc::clone(&persister),
 680         ));
 681
 682         // Step 7: Read ChannelMonitor state from disk
 683         let mut channelmonitors = persister
 684                 .read_all_channel_monitors_with_updates(&bitcoind_client, &bitcoind_client)
 685                 .unwrap();
 686         // If you are using the `FilesystemStore` as a `Persist` directly, use
 687         // `lightning::util::persist::read_channel_monitors` like this:
 688         //read_channel_monitors(Arc::clone(&persister), Arc::clone(&keys_manager), Arc::clone(&keys_manager)).unwrap();
 689
 690         // Step 8: Poll for the best chain tip, which may be used by the channel manager & spv client
 691         let polled_chain_tip = init::validate_best_block_header(bitcoind_client.as_ref())
 692                 .await
 693                 .expect("Failed to fetch best block header and best block");
 694
 695         // Step 9: Initialize routing ProbabilisticScorer
 696         let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
 697         let network_graph =
 698                 Arc::new(disk::read_network(Path::new(&network_graph_path), args.network, logger.clone()));
 699
 700         let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
 701         let scorer = Arc::new(RwLock::new(disk::read_scorer(
 702                 Path::new(&scorer_path),
 703                 Arc::clone(&network_graph),
 704                 Arc::clone(&logger),
 705         )));
 706
 707         // Step 10: Create Router
 708         let scoring_fee_params = ProbabilisticScoringFeeParameters::default();
 709         let router = Arc::new(DefaultRouter::new(
 710                 network_graph.clone(),
 711                 logger.clone(),
 712                 keys_manager.get_secure_random_bytes(),
 713                 scorer.clone(),
 714                 scoring_fee_params,
 715         ));
 716
 717         // Step 11: Initialize the ChannelManager
 718         let mut user_config = UserConfig::default();
 719         user_config.channel_handshake_limits.force_announced_channel_preference = false;
 720         user_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
 721         user_config.manually_accept_inbound_channels = true;
 722         let mut restarting_node = true;
 723         let (channel_manager_blockhash, channel_manager) = {
 724                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 725                         let mut channel_monitor_mut_references = Vec::new();
 726                         for (_, channel_monitor) in channelmonitors.iter_mut() {
 727                                 channel_monitor_mut_references.push(channel_monitor);
 728                         }
 729                         let read_args = ChannelManagerReadArgs::new(
 730                                 keys_manager.clone(),
 731                                 keys_manager.clone(),
 732                                 keys_manager.clone(),
 733                                 fee_estimator.clone(),
 734                                 chain_monitor.clone(),
 735                                 broadcaster.clone(),
 736                                 router,
 737                                 logger.clone(),
 738                                 user_config,
 739                                 channel_monitor_mut_references,
 740                         );
 741                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 742                 } else {
 743                         // We're starting a fresh node.
 744                         restarting_node = false;
 745
 746                         let polled_best_block = polled_chain_tip.to_best_block();
 747                         let polled_best_block_hash = polled_best_block.block_hash();
 748                         let chain_params =
 749                                 ChainParameters { network: args.network, best_block: polled_best_block };
 750                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 751                                 fee_estimator.clone(),
 752                                 chain_monitor.clone(),
 753                                 broadcaster.clone(),
 754                                 router,
 755                                 logger.clone(),
 756                                 keys_manager.clone(),
 757                                 keys_manager.clone(),
 758                                 keys_manager.clone(),
 759                                 user_config,
 760                                 chain_params,
 761                                 cur.as_secs() as u32,
 762                         );
 763                         (polled_best_block_hash, fresh_channel_manager)
 764                 }
 765         };
 766
 767         // Step 12: Sync ChannelMonitors and ChannelManager to chain tip
 768         let mut chain_listener_channel_monitors = Vec::new();
 769         let mut cache = UnboundedCache::new();
 770         let chain_tip = if restarting_node {
 771                 let mut chain_listeners = vec![(
 772                         channel_manager_blockhash,
 773                         &channel_manager as &(dyn chain::Listen + Send + Sync),
 774                 )];
 775
 776                 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
 777                         let outpoint = channel_monitor.get_funding_txo().0;
 778                         chain_listener_channel_monitors.push((
 779                                 blockhash,
 780                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 781                                 outpoint,
 782                         ));
 783                 }
 784
 785                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 786                         chain_listeners.push((
 787                                 monitor_listener_info.0,
 788                                 &monitor_listener_info.1 as &(dyn chain::Listen + Send + Sync),
 789                         ));
 790                 }
 791
 792                 init::synchronize_listeners(
 793                         bitcoind_client.as_ref(),
 794                         args.network,
 795                         &mut cache,
 796                         chain_listeners,
 797                 )
 798                 .await
 799                 .unwrap()
 800         } else {
 801                 polled_chain_tip
 802         };
 803
 804         // Step 13: Give ChannelMonitors to ChainMonitor
 805         for item in chain_listener_channel_monitors.drain(..) {
 806                 let channel_monitor = item.1 .0;
 807                 let funding_outpoint = item.2;
 808                 assert_eq!(
 809                         chain_monitor.watch_channel(funding_outpoint, channel_monitor),
 810                         Ok(ChannelMonitorUpdateStatus::Completed)
 811                 );
 812         }
 813
 814         // Step 14: Optional: Initialize the P2PGossipSync
 815         let gossip_sync =
 816                 Arc::new(P2PGossipSync::new(Arc::clone(&network_graph), None, Arc::clone(&logger)));
 817
 818         // Step 15: Initialize the PeerManager
 819         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 820         let onion_messenger: Arc<OnionMessenger> = Arc::new(OnionMessenger::new(
 821                 Arc::clone(&keys_manager),
 822                 Arc::clone(&keys_manager),
 823                 Arc::clone(&logger),
 824                 Arc::new(DefaultMessageRouter {}),
 825                 Arc::clone(&channel_manager),
 826                 IgnoringMessageHandler {},
 827         ));
 828         let mut ephemeral_bytes = [0; 32];
 829         let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
 830         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 831         let lightning_msg_handler = MessageHandler {
 832                 chan_handler: channel_manager.clone(),
 833                 route_handler: gossip_sync.clone(),
 834                 onion_message_handler: onion_messenger.clone(),
 835                 custom_message_handler: IgnoringMessageHandler {},
 836         };
 837         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 838                 lightning_msg_handler,
 839                 current_time.try_into().unwrap(),
 840                 &ephemeral_bytes,
 841                 logger.clone(),
 842                 Arc::clone(&keys_manager),
 843         ));
 844
 845         // Install a GossipVerifier in in the P2PGossipSync
 846         let utxo_lookup = GossipVerifier::new(
 847                 Arc::clone(&bitcoind_client.bitcoind_rpc_client),
 848                 lightning_block_sync::gossip::TokioSpawner,
 849                 Arc::clone(&gossip_sync),
 850                 Arc::clone(&peer_manager),
 851         );
 852         gossip_sync.add_utxo_lookup(Some(utxo_lookup));
 853
 854         // ## Running LDK
 855         // Step 16: Initialize networking
 856
 857         let peer_manager_connection_handler = peer_manager.clone();
 858         let listening_port = args.ldk_peer_listening_port;
 859         let stop_listen_connect = Arc::new(AtomicBool::new(false));
 860         let stop_listen = Arc::clone(&stop_listen_connect);
 861         tokio::spawn(async move {
 862                 let listener = tokio::net::TcpListener::bind(format!("[::]:{}", listening_port))
 863                         .await
 864                         .expect("Failed to bind to listen port - is something else already listening on it?");
 865                 loop {
 866                         let peer_mgr = peer_manager_connection_handler.clone();
 867                         let tcp_stream = listener.accept().await.unwrap().0;
 868                         if stop_listen.load(Ordering::Acquire) {
 869                                 return;
 870                         }
 871                         tokio::spawn(async move {
 872                                 lightning_net_tokio::setup_inbound(
 873                                         peer_mgr.clone(),
 874                                         tcp_stream.into_std().unwrap(),
 875                                 )
 876                                 .await;
 877                         });
 878                 }
 879         });
 880
 881         // Step 17: Connect and Disconnect Blocks
 882         let channel_manager_listener = channel_manager.clone();
 883         let chain_monitor_listener = chain_monitor.clone();
 884         let bitcoind_block_source = bitcoind_client.clone();
 885         let network = args.network;
 886         tokio::spawn(async move {
 887                 let chain_poller = poll::ChainPoller::new(bitcoind_block_source.as_ref(), network);
 888                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 889                 let mut spv_client = SpvClient::new(chain_tip, chain_poller, &mut cache, &chain_listener);
 890                 loop {
 891                         spv_client.poll_best_tip().await.unwrap();
 892                         tokio::time::sleep(Duration::from_secs(1)).await;
 893                 }
 894         });
 895
 896         let inbound_payments = Arc::new(Mutex::new(disk::read_inbound_payment_info(Path::new(
 897                 &format!("{}/{}", ldk_data_dir, INBOUND_PAYMENTS_FNAME),
 898         ))));
 899         let outbound_payments = Arc::new(Mutex::new(disk::read_outbound_payment_info(Path::new(
 900                 &format!("{}/{}", ldk_data_dir, OUTBOUND_PAYMENTS_FNAME),
 901         ))));
 902         let recent_payments_payment_ids = channel_manager
 903                 .list_recent_payments()
 904                 .into_iter()
 905                 .filter_map(|p| match p {
 906                         RecentPaymentDetails::Pending { payment_id, .. } => Some(payment_id),
 907                         RecentPaymentDetails::Fulfilled { payment_id, .. } => Some(payment_id),
 908                         RecentPaymentDetails::Abandoned { payment_id, .. } => Some(payment_id),
 909                         RecentPaymentDetails::AwaitingInvoice { payment_id } => Some(payment_id),
 910                 })
 911                 .collect::<Vec<PaymentId>>();
 912         for (payment_id, payment_info) in outbound_payments
 913                 .lock()
 914                 .unwrap()
 915                 .payments
 916                 .iter_mut()
 917                 .filter(|(_, i)| matches!(i.status, HTLCStatus::Pending))
 918         {
 919                 if !recent_payments_payment_ids.contains(payment_id) {
 920                         payment_info.status = HTLCStatus::Failed;
 921                 }
 922         }
 923         fs_store
 924                 .write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound_payments.lock().unwrap().encode())
 925                 .unwrap();
 926
 927         // Step 18: Handle LDK Events
 928         let channel_manager_event_listener = Arc::clone(&channel_manager);
 929         let bitcoind_client_event_listener = Arc::clone(&bitcoind_client);
 930         let network_graph_event_listener = Arc::clone(&network_graph);
 931         let keys_manager_event_listener = Arc::clone(&keys_manager);
 932         let inbound_payments_event_listener = Arc::clone(&inbound_payments);
 933         let outbound_payments_event_listener = Arc::clone(&outbound_payments);
 934         let fs_store_event_listener = Arc::clone(&fs_store);
 935         let network = args.network;
 936         let event_handler = move |event: Event| {
 937                 let channel_manager_event_listener = Arc::clone(&channel_manager_event_listener);
 938                 let bitcoind_client_event_listener = Arc::clone(&bitcoind_client_event_listener);
 939                 let network_graph_event_listener = Arc::clone(&network_graph_event_listener);
 940                 let keys_manager_event_listener = Arc::clone(&keys_manager_event_listener);
 941                 let bump_tx_event_handler = Arc::clone(&bump_tx_event_handler);
 942                 let inbound_payments_event_listener = Arc::clone(&inbound_payments_event_listener);
 943                 let outbound_payments_event_listener = Arc::clone(&outbound_payments_event_listener);
 944                 let fs_store_event_listener = Arc::clone(&fs_store_event_listener);
 945                 async move {
 946                         handle_ldk_events(
 947                                 &channel_manager_event_listener,
 948                                 &bitcoind_client_event_listener,
 949                                 &network_graph_event_listener,
 950                                 &keys_manager_event_listener,
 951                                 &bump_tx_event_handler,
 952                                 inbound_payments_event_listener,
 953                                 outbound_payments_event_listener,
 954                                 &fs_store_event_listener,
 955                                 network,
 956                                 event,
 957                         )
 958                         .await;
 959                 }
 960         };
 961
 962         // Step 19: Persist ChannelManager and NetworkGraph
 963         let persister = Arc::new(FilesystemStore::new(ldk_data_dir.clone().into()));
 964
 965         // Step 20: Background Processing
 966         let (bp_exit, bp_exit_check) = tokio::sync::watch::channel(());
 967         let mut background_processor = tokio::spawn(process_events_async(
 968                 Arc::clone(&persister),
 969                 event_handler,
 970                 chain_monitor.clone(),
 971                 channel_manager.clone(),
 972                 GossipSync::p2p(gossip_sync.clone()),
 973                 peer_manager.clone(),
 974                 logger.clone(),
 975                 Some(scorer.clone()),
 976                 move |t| {
 977                         let mut bp_exit_fut_check = bp_exit_check.clone();
 978                         Box::pin(async move {
 979                                 tokio::select! {
 980                                         _ = tokio::time::sleep(t) => false,
 981                                         _ = bp_exit_fut_check.changed() => true,
 982                                 }
 983                         })
 984                 },
 985                 false,
 986         ));
 987
 988         // Regularly reconnect to channel peers.
 989         let connect_cm = Arc::clone(&channel_manager);
 990         let connect_pm = Arc::clone(&peer_manager);
 991         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir);
 992         let stop_connect = Arc::clone(&stop_listen_connect);
 993         tokio::spawn(async move {
 994                 let mut interval = tokio::time::interval(Duration::from_secs(1));
 995                 interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Delay);
 996                 loop {
 997                         interval.tick().await;
 998                         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 999                                 Ok(info) => {
1000                                         let peers = connect_pm.get_peer_node_ids();
1001                                         for node_id in connect_cm
1002                                                 .list_channels()
1003                                                 .iter()
1004                                                 .map(|chan| chan.counterparty.node_id)
1005                                                 .filter(|id| !peers.iter().any(|(pk, _)| id == pk))
1006                                         {
1007                                                 if stop_connect.load(Ordering::Acquire) {
1008                                                         return;
1009                                                 }
1010                                                 for (pubkey, peer_addr) in info.iter() {
1011                                                         if *pubkey == node_id {
1012                                                                 let _ = cli::do_connect_peer(
1013                                                                         *pubkey,
1014                                                                         peer_addr.clone(),
1015                                                                         Arc::clone(&connect_pm),
1016                                                                 )
1017                                                                 .await;
1018                                                         }
1019                                                 }
1020                                         }
1021                                 }
1022                                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
1023                         }
1024                 }
1025         });
1026
1027         // Regularly broadcast our node_announcement. This is only required (or possible) if we have
1028         // some public channels.
1029         let peer_man = Arc::clone(&peer_manager);
1030         let chan_man = Arc::clone(&channel_manager);
1031         let network = args.network;
1032         tokio::spawn(async move {
1033                 // First wait a minute until we have some peers and maybe have opened a channel.
1034                 tokio::time::sleep(Duration::from_secs(60)).await;
1035                 // Then, update our announcement once an hour to keep it fresh but avoid unnecessary churn
1036                 // in the global gossip network.
1037                 let mut interval = tokio::time::interval(Duration::from_secs(3600));
1038                 loop {
1039                         interval.tick().await;
1040                         // Don't bother trying to announce if we don't have any public channls, though our
1041                         // peers should drop such an announcement anyway. Note that announcement may not
1042                         // propagate until we have a channel with 6+ confirmations.
1043                         if chan_man.list_channels().iter().any(|chan| chan.is_public) {
1044                                 peer_man.broadcast_node_announcement(
1045                                         [0; 3],
1046                                         args.ldk_announced_node_name,
1047                                         args.ldk_announced_listen_addr.clone(),
1048                                 );
1049                         }
1050                 }
1051         });
1052
1053         tokio::spawn(sweep::periodic_sweep(
1054                 ldk_data_dir.clone(),
1055                 Arc::clone(&keys_manager),
1056                 Arc::clone(&logger),
1057                 Arc::clone(&persister),
1058                 Arc::clone(&bitcoind_client),
1059                 Arc::clone(&channel_manager),
1060         ));
1061
1062         // Regularly probe
1063         let probing_cm = Arc::clone(&channel_manager);
1064         let probing_graph = Arc::clone(&network_graph);
1065         let probing_logger = Arc::clone(&logger);
1066         let probing_scorer = Arc::clone(&scorer);
1067         tokio::spawn(async move {
1068                 let mut interval = tokio::time::interval(Duration::from_secs(1));
1069                 loop {
1070                         interval.tick().await;
1071                         send_rand_probe(&*probing_cm, &*probing_graph, &*probing_logger, &*probing_scorer);
1072                 }
1073         });
1074
1075         // Start the CLI.
1076         let cli_channel_manager = Arc::clone(&channel_manager);
1077         let cli_persister = Arc::clone(&persister);
1078         let cli_logger = Arc::clone(&logger);
1079         let cli_peer_manager = Arc::clone(&peer_manager);
1080         let cli_poll = tokio::task::spawn_blocking(move || {
1081                 cli::poll_for_user_input(
1082                         cli_peer_manager,
1083                         cli_channel_manager,
1084                         keys_manager,
1085                         network_graph,
1086                         onion_messenger,
1087                         inbound_payments,
1088                         outbound_payments,
1089                         ldk_data_dir,
1090                         network,
1091                         cli_logger,
1092                         cli_persister,
1093                 )
1094         });
1095
1096         // Exit if either CLI polling exits or the background processor exits (which shouldn't happen
1097         // unless we fail to write to the filesystem).
1098         let mut bg_res = Ok(Ok(()));
1099         tokio::select! {
1100                 _ = cli_poll => {},
1101                 bg_exit = &mut background_processor => {
1102                         bg_res = bg_exit;
1103                 },
1104         }
1105
1106         // Disconnect our peers and stop accepting new connections. This ensures we don't continue
1107         // updating our channel data after we've stopped the background processor.
1108         stop_listen_connect.store(true, Ordering::Release);
1109         peer_manager.disconnect_all_peers();
1110
1111         if let Err(e) = bg_res {
1112                 let persist_res = persister
1113                         .write(
1114                                 persist::CHANNEL_MANAGER_PERSISTENCE_PRIMARY_NAMESPACE,
1115                                 persist::CHANNEL_MANAGER_PERSISTENCE_SECONDARY_NAMESPACE,
1116                                 persist::CHANNEL_MANAGER_PERSISTENCE_KEY,
1117                                 &channel_manager.encode(),
1118                         )
1119                         .unwrap();
1120                 use lightning::util::logger::Logger;
1121                 lightning::log_error!(
1122                         &*logger,
1123                         "Last-ditch ChannelManager persistence result: {:?}",
1124                         persist_res
1125                 );
1126                 panic!(
1127                         "ERR: background processing stopped with result {:?}, exiting.\n\
1128                         Last-ditch ChannelManager persistence result {:?}",
1129                         e, persist_res
1130                 );
1131         }
1132
1133         // Stop the background processor.
1134         if !bp_exit.is_closed() {
1135                 bp_exit.send(()).unwrap();
1136                 background_processor.await.unwrap().unwrap();
1137         }
1138 }
1139
1140 #[tokio::main]
1141 pub async fn main() {
1142         #[cfg(not(target_os = "windows"))]
1143         {
1144                 // Catch Ctrl-C with a dummy signal handler.
1145                 unsafe {
1146                         let mut new_action: libc::sigaction = core::mem::zeroed();
1147                         let mut old_action: libc::sigaction = core::mem::zeroed();
1148
1149                         extern "C" fn dummy_handler(
1150                                 _: libc::c_int, _: *const libc::siginfo_t, _: *const libc::c_void,
1151                         ) {
1152                         }
1153
1154                         new_action.sa_sigaction = dummy_handler as libc::sighandler_t;
1155                         new_action.sa_flags = libc::SA_SIGINFO;
1156
1157                         libc::sigaction(
1158                                 libc::SIGINT,
1159                                 &new_action as *const libc::sigaction,
1160                                 &mut old_action as *mut libc::sigaction,
1161                         );
1162                 }
1163         }
1164
1165         start_ldk().await;
1166 }