_ 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::hashes::sha256::Hash as Sha256;
  13 use bitcoin::hashes::Hash;
  14 use bitcoin::network::constants::Network;
  15 use bitcoin::secp256k1::Secp256k1;
  16 use bitcoin::BlockHash;
  17 use bitcoin_bech32::WitnessProgram;
  18 use lightning::chain;
  19 use lightning::chain::chaininterface::{BroadcasterInterface, ConfirmationTarget, FeeEstimator};
  20 use lightning::chain::chainmonitor;
  21 use lightning::chain::keysinterface::{InMemorySigner, KeysInterface, KeysManager};
  22 use lightning::chain::transaction::OutPoint;
  23 use lightning::chain::Filter;
  24 use lightning::chain::Watch;
  25 use lightning::ln::channelmanager;
  26 use lightning::ln::channelmanager::{
  27         ChainParameters, ChannelManagerReadArgs, PaymentHash, PaymentPreimage, SimpleArcChannelManager,
  28 };
  29 use lightning::ln::peer_handler::{MessageHandler, SimpleArcPeerManager};
  30 use lightning::routing::network_graph::NetGraphMsgHandler;
  31 use lightning::util::config::UserConfig;
  32 use lightning::util::events::{Event, EventsProvider};
  33 use lightning::util::ser::ReadableArgs;
  34 use lightning_background_processor::BackgroundProcessor;
  35 use lightning_block_sync::init;
  36 use lightning_block_sync::poll;
  37 use lightning_block_sync::SpvClient;
  38 use lightning_block_sync::UnboundedCache;
  39 use lightning_net_tokio::SocketDescriptor;
  40 use lightning_persister::FilesystemPersister;
  41 use rand::{thread_rng, Rng};
  42 use std::collections::HashMap;
  43 use std::fmt;
  44 use std::fs;
  45 use std::fs::File;
  46 use std::io;
  47 use std::io::Write;
  48 use std::ops::Deref;
  49 use std::path::Path;
  50 use std::sync::{Arc, Mutex};
  51 use std::time::{Duration, SystemTime};
  52 use tokio::sync::mpsc;
  53
  54 #[derive(PartialEq)]
  55 pub(crate) enum HTLCDirection {
  56         Inbound,
  57         Outbound,
  58 }
  59
  60 pub(crate) enum HTLCStatus {
  61         Pending,
  62         Succeeded,
  63         Failed,
  64 }
  65
  66 pub(crate) struct SatoshiAmount(Option<u64>);
  67
  68 impl fmt::Display for SatoshiAmount {
  69         fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
  70                 match self.0 {
  71                         Some(amt) => write!(f, "{}", amt),
  72                         None => write!(f, "unknown"),
  73                 }
  74         }
  75 }
  76
  77 pub(crate) type PaymentInfoStorage = Arc<
  78         Mutex<
  79                 HashMap<PaymentHash, (Option<PaymentPreimage>, HTLCDirection, HTLCStatus, SatoshiAmount)>,
  80         >,
  81 >;
  82
  83 type ChainMonitor = chainmonitor::ChainMonitor<
  84         InMemorySigner,
  85         Arc<dyn Filter>,
  86         Arc<BitcoindClient>,
  87         Arc<BitcoindClient>,
  88         Arc<FilesystemLogger>,
  89         Arc<FilesystemPersister>,
  90 >;
  91
  92 pub(crate) type PeerManager = SimpleArcPeerManager<
  93         SocketDescriptor,
  94         ChainMonitor,
  95         BitcoindClient,
  96         BitcoindClient,
  97         dyn chain::Access,
  98         FilesystemLogger,
  99 >;
 100
 101 pub(crate) type ChannelManager =
 102         SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
 103
 104 async fn handle_ldk_events(
 105         peer_manager: Arc<PeerManager>, channel_manager: Arc<ChannelManager>,
 106         chain_monitor: Arc<ChainMonitor>, bitcoind_client: Arc<BitcoindClient>,
 107         keys_manager: Arc<KeysManager>, payment_storage: PaymentInfoStorage, network: Network,
 108 ) {
 109         let mut pending_txs: HashMap<OutPoint, Transaction> = HashMap::new();
 110         loop {
 111                 peer_manager.process_events();
 112                 let loop_channel_manager = channel_manager.clone();
 113                 let mut events = channel_manager.get_and_clear_pending_events();
 114                 events.append(&mut chain_monitor.get_and_clear_pending_events());
 115                 for event in events {
 116                         match event {
 117                                 Event::FundingGenerationReady {
 118                                         temporary_channel_id,
 119                                         channel_value_satoshis,
 120                                         output_script,
 121                                         ..
 122                                 } => {
 123                                         // Construct the raw transaction with one output, that is paid the amount of the
 124                                         // channel.
 125                                         let addr = WitnessProgram::from_scriptpubkey(
 126                                                 &output_script[..],
 127                                                 match network {
 128                                                         Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
 129                                                         Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
 130                                                         Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
 131                                                         Network::Signet => panic!("Signet unsupported"),
 132                                                 },
 133                                         )
 134                                         .expect("Lightning funding tx should always be to a SegWit output")
 135                                         .to_address();
 136                                         let mut outputs = vec![HashMap::with_capacity(1)];
 137                                         outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
 138                                         let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
 139
 140                                         // Have your wallet put the inputs into the transaction such that the output is
 141                                         // satisfied.
 142                                         let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
 143                                         let change_output_position = funded_tx.changepos;
 144                                         assert!(change_output_position == 0 || change_output_position == 1);
 145
 146                                         // Sign the final funding transaction and broadcast it.
 147                                         let signed_tx =
 148                                                 bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
 149                                         assert_eq!(signed_tx.complete, true);
 150                                         let final_tx: Transaction =
 151                                                 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
 152                                         let outpoint = OutPoint {
 153                                                 txid: final_tx.txid(),
 154                                                 index: if change_output_position == 0 { 1 } else { 0 },
 155                                         };
 156                                         // Give the funding transaction back to LDK for opening the channel.
 157                                         loop_channel_manager
 158                                                 .funding_transaction_generated(&temporary_channel_id, outpoint);
 159                                         pending_txs.insert(outpoint, final_tx);
 160                                 }
 161                                 Event::FundingBroadcastSafe { funding_txo, .. } => {
 162                                         let funding_tx = pending_txs.remove(&funding_txo).unwrap();
 163                                         bitcoind_client.broadcast_transaction(&funding_tx);
 164                                         println!("\nEVENT: broadcasted funding transaction");
 165                                         print!("> ");
 166                                         io::stdout().flush().unwrap();
 167                                 }
 168                                 Event::PaymentReceived { payment_hash, payment_secret, amt: amt_msat } => {
 169                                         let mut payments = payment_storage.lock().unwrap();
 170                                         if let Some((Some(preimage), _, _, _)) = payments.get(&payment_hash) {
 171                                                 assert!(loop_channel_manager.claim_funds(
 172                                                         preimage.clone(),
 173                                                         &payment_secret,
 174                                                         amt_msat
 175                                                 ));
 176                                                 println!(
 177                                                         "\nEVENT: received payment from payment_hash {} of {} satoshis",
 178                                                         hex_utils::hex_str(&payment_hash.0),
 179                                                         amt_msat / 1000
 180                                                 );
 181                                                 print!("> ");
 182                                                 io::stdout().flush().unwrap();
 183                                                 let (_, _, ref mut status, _) = payments.get_mut(&payment_hash).unwrap();
 184                                                 *status = HTLCStatus::Succeeded;
 185                                         } else {
 186                                                 println!("\nERROR: we received a payment but didn't know the preimage");
 187                                                 print!("> ");
 188                                                 io::stdout().flush().unwrap();
 189                                                 loop_channel_manager.fail_htlc_backwards(&payment_hash, &payment_secret);
 190                                                 payments.insert(
 191                                                         payment_hash,
 192                                                         (None, HTLCDirection::Inbound, HTLCStatus::Failed, SatoshiAmount(None)),
 193                                                 );
 194                                         }
 195                                 }
 196                                 Event::PaymentSent { payment_preimage } => {
 197                                         let hashed = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
 198                                         let mut payments = payment_storage.lock().unwrap();
 199                                         for (payment_hash, (preimage_option, _, status, amt_sat)) in payments.iter_mut()
 200                                         {
 201                                                 if *payment_hash == hashed {
 202                                                         *preimage_option = Some(payment_preimage);
 203                                                         *status = HTLCStatus::Succeeded;
 204                                                         println!(
 205                                                                 "\nEVENT: successfully sent payment of {} satoshis from \
 206                                          payment hash {:?} with preimage {:?}",
 207                                                                 amt_sat,
 208                                                                 hex_utils::hex_str(&payment_hash.0),
 209                                                                 hex_utils::hex_str(&payment_preimage.0)
 210                                                         );
 211                                                         print!("> ");
 212                                                         io::stdout().flush().unwrap();
 213                                                 }
 214                                         }
 215                                 }
 216                                 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
 217                                         print!(
 218                                                 "\nEVENT: Failed to send payment to payment hash {:?}: ",
 219                                                 hex_utils::hex_str(&payment_hash.0)
 220                                         );
 221                                         if rejected_by_dest {
 222                                                 println!("rejected by destination node");
 223                                         } else {
 224                                                 println!("route failed");
 225                                         }
 226                                         print!("> ");
 227                                         io::stdout().flush().unwrap();
 228
 229                                         let mut payments = payment_storage.lock().unwrap();
 230                                         if payments.contains_key(&payment_hash) {
 231                                                 let (_, _, ref mut status, _) = payments.get_mut(&payment_hash).unwrap();
 232                                                 *status = HTLCStatus::Failed;
 233                                         }
 234                                 }
 235                                 Event::PendingHTLCsForwardable { time_forwardable } => {
 236                                         let forwarding_channel_manager = loop_channel_manager.clone();
 237                                         tokio::spawn(async move {
 238                                                 let min = time_forwardable.as_millis() as u64;
 239                                                 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
 240                                                 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
 241                                                 forwarding_channel_manager.process_pending_htlc_forwards();
 242                                         });
 243                                 }
 244                                 Event::SpendableOutputs { outputs } => {
 245                                         let destination_address = bitcoind_client.get_new_address().await;
 246                                         let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
 247                                         let tx_feerate =
 248                                                 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
 249                                         let spending_tx = keys_manager
 250                                                 .spend_spendable_outputs(
 251                                                         output_descriptors,
 252                                                         Vec::new(),
 253                                                         destination_address.script_pubkey(),
 254                                                         tx_feerate,
 255                                                         &Secp256k1::new(),
 256                                                 )
 257                                                 .unwrap();
 258                                         bitcoind_client.broadcast_transaction(&spending_tx);
 259                                         // XXX maybe need to rescan and blah?
 260                                 }
 261                         }
 262                 }
 263                 tokio::time::sleep(Duration::from_secs(1)).await;
 264         }
 265 }
 266
 267 #[tokio::main]
 268 pub async fn main() {
 269         let args = match cli::parse_startup_args() {
 270                 Ok(user_args) => user_args,
 271                 Err(()) => return,
 272         };
 273
 274         // Initialize the LDK data directory if necessary.
 275         let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
 276         fs::create_dir_all(ldk_data_dir.clone()).unwrap();
 277
 278         // Initialize our bitcoind client.
 279         let bitcoind_client = match BitcoindClient::new(
 280                 args.bitcoind_rpc_host.clone(),
 281                 args.bitcoind_rpc_port,
 282                 args.bitcoind_rpc_username.clone(),
 283                 args.bitcoind_rpc_password.clone(),
 284         )
 285         .await
 286         {
 287                 Ok(client) => Arc::new(client),
 288                 Err(e) => {
 289                         println!("Failed to connect to bitcoind client: {}", e);
 290                         return;
 291                 }
 292         };
 293
 294         // ## Setup
 295         // Step 1: Initialize the FeeEstimator
 296
 297         // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
 298         let fee_estimator = bitcoind_client.clone();
 299
 300         // Step 2: Initialize the Logger
 301         let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
 302
 303         // Step 3: Initialize the BroadcasterInterface
 304
 305         // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
 306         // broadcaster.
 307         let broadcaster = bitcoind_client.clone();
 308
 309         // Step 4: Initialize Persist
 310         let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
 311
 312         // Step 5: Initialize the ChainMonitor
 313         let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
 314                 None,
 315                 broadcaster.clone(),
 316                 logger.clone(),
 317                 fee_estimator.clone(),
 318                 persister.clone(),
 319         ));
 320
 321         // Step 6: Initialize the KeysManager
 322
 323         // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
 324         // other secret key material.
 325         let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
 326         let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
 327                 assert_eq!(seed.len(), 32);
 328                 let mut key = [0; 32];
 329                 key.copy_from_slice(&seed);
 330                 key
 331         } else {
 332                 let mut key = [0; 32];
 333                 thread_rng().fill_bytes(&mut key);
 334                 match File::create(keys_seed_path.clone()) {
 335                         Ok(mut f) => {
 336                                 f.write_all(&key).expect("Failed to write node keys seed to disk");
 337                                 f.sync_all().expect("Failed to sync node keys seed to disk");
 338                         }
 339                         Err(e) => {
 340                                 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
 341                                 return;
 342                         }
 343                 }
 344                 key
 345         };
 346         let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
 347         let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
 348
 349         // Step 7: Read ChannelMonitor state from disk
 350         let monitors_path = format!("{}/monitors", ldk_data_dir.clone());
 351         let mut outpoint_to_channelmonitor =
 352                 disk::read_channelmonitors(monitors_path.to_string(), keys_manager.clone()).unwrap();
 353
 354         // Step 9: Initialize the ChannelManager
 355         let user_config = UserConfig::default();
 356         let mut restarting_node = true;
 357         let (channel_manager_blockhash, mut channel_manager) = {
 358                 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
 359                         let mut channel_monitor_mut_references = Vec::new();
 360                         for (_, channel_monitor) in outpoint_to_channelmonitor.iter_mut() {
 361                                 channel_monitor_mut_references.push(&mut channel_monitor.1);
 362                         }
 363                         let read_args = ChannelManagerReadArgs::new(
 364                                 keys_manager.clone(),
 365                                 fee_estimator.clone(),
 366                                 chain_monitor.clone(),
 367                                 broadcaster.clone(),
 368                                 logger.clone(),
 369                                 user_config,
 370                                 channel_monitor_mut_references,
 371                         );
 372                         <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
 373                 } else {
 374                         // We're starting a fresh node.
 375                         restarting_node = false;
 376                         let getinfo_resp = bitcoind_client.get_blockchain_info().await;
 377
 378                         let chain_params = ChainParameters {
 379                                 network: args.network,
 380                                 latest_hash: getinfo_resp.latest_blockhash,
 381                                 latest_height: getinfo_resp.latest_height,
 382                         };
 383                         let fresh_channel_manager = channelmanager::ChannelManager::new(
 384                                 fee_estimator.clone(),
 385                                 chain_monitor.clone(),
 386                                 broadcaster.clone(),
 387                                 logger.clone(),
 388                                 keys_manager.clone(),
 389                                 user_config,
 390                                 chain_params,
 391                         );
 392                         (getinfo_resp.latest_blockhash, fresh_channel_manager)
 393                 }
 394         };
 395
 396         // Step 10: Sync ChannelMonitors and ChannelManager to chain tip
 397         let mut chain_listener_channel_monitors = Vec::new();
 398         let mut cache = UnboundedCache::new();
 399         let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
 400         if restarting_node {
 401                 let mut chain_listeners =
 402                         vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
 403
 404                 for (outpoint, blockhash_and_monitor) in outpoint_to_channelmonitor.drain() {
 405                         let blockhash = blockhash_and_monitor.0;
 406                         let channel_monitor = blockhash_and_monitor.1;
 407                         chain_listener_channel_monitors.push((
 408                                 blockhash,
 409                                 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
 410                                 outpoint,
 411                         ));
 412                 }
 413
 414                 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
 415                         chain_listeners.push((
 416                                 monitor_listener_info.0,
 417                                 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
 418                         ));
 419                 }
 420                 chain_tip = Some(
 421                         init::synchronize_listeners(
 422                                 &mut bitcoind_client.deref(),
 423                                 args.network,
 424                                 &mut cache,
 425                                 chain_listeners,
 426                         )
 427                         .await
 428                         .unwrap(),
 429                 );
 430         }
 431
 432         // Step 11: Give ChannelMonitors to ChainMonitor
 433         for item in chain_listener_channel_monitors.drain(..) {
 434                 let channel_monitor = item.1 .0;
 435                 let funding_outpoint = item.2;
 436                 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
 437         }
 438
 439         // Step 13: Optional: Initialize the NetGraphMsgHandler
 440         // XXX persist routing data
 441         let genesis = genesis_block(args.network).header.block_hash();
 442         let router =
 443                 Arc::new(NetGraphMsgHandler::new(genesis, None::<Arc<dyn chain::Access>>, logger.clone()));
 444
 445         // Step 14: Initialize the PeerManager
 446         let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
 447         let mut ephemeral_bytes = [0; 32];
 448         rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
 449         let lightning_msg_handler =
 450                 MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
 451         let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
 452                 lightning_msg_handler,
 453                 keys_manager.get_node_secret(),
 454                 &ephemeral_bytes,
 455                 logger.clone(),
 456         ));
 457
 458         // ## Running LDK
 459         // Step 16: Initialize Peer Connection Handling
 460
 461         // We poll for events in handle_ldk_events(..) rather than waiting for them over the
 462         // mpsc::channel, so we can leave the event receiver as unused.
 463         let (event_ntfn_sender, _event_ntfn_receiver) = mpsc::channel(2);
 464         let peer_manager_connection_handler = peer_manager.clone();
 465         let event_notifier = event_ntfn_sender.clone();
 466         let listening_port = args.ldk_peer_listening_port;
 467         tokio::spawn(async move {
 468                 let listener = std::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port)).unwrap();
 469                 loop {
 470                         let tcp_stream = listener.accept().unwrap().0;
 471                         lightning_net_tokio::setup_inbound(
 472                                 peer_manager_connection_handler.clone(),
 473                                 event_notifier.clone(),
 474                                 tcp_stream,
 475                         )
 476                         .await;
 477                 }
 478         });
 479
 480         // Step 17: Connect and Disconnect Blocks
 481         if chain_tip.is_none() {
 482                 chain_tip =
 483                         Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
 484         }
 485         let channel_manager_listener = channel_manager.clone();
 486         let chain_monitor_listener = chain_monitor.clone();
 487         let bitcoind_block_source = bitcoind_client.clone();
 488         let network = args.network;
 489         tokio::spawn(async move {
 490                 let mut derefed = bitcoind_block_source.deref();
 491                 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
 492                 let chain_listener = (chain_monitor_listener, channel_manager_listener);
 493                 let mut spv_client =
 494                         SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
 495                 loop {
 496                         spv_client.poll_best_tip().await.unwrap();
 497                         tokio::time::sleep(Duration::from_secs(1)).await;
 498                 }
 499         });
 500
 501         // Step 17 & 18: Initialize ChannelManager persistence & Once Per Minute: ChannelManager's
 502         // timer_chan_freshness_every_min() and PeerManager's timer_tick_occurred
 503         let data_dir = ldk_data_dir.clone();
 504         let persist_channel_manager_callback =
 505                 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
 506         BackgroundProcessor::start(
 507                 persist_channel_manager_callback,
 508                 channel_manager.clone(),
 509                 logger.clone(),
 510         );
 511
 512         let peer_manager_processor = peer_manager.clone();
 513         tokio::spawn(async move {
 514                 loop {
 515                         peer_manager_processor.timer_tick_occurred();
 516                         tokio::time::sleep(Duration::from_secs(60)).await;
 517                 }
 518         });
 519
 520         // Step 15: Initialize LDK Event Handling
 521         let peer_manager_event_listener = peer_manager.clone();
 522         let channel_manager_event_listener = channel_manager.clone();
 523         let chain_monitor_event_listener = chain_monitor.clone();
 524         let keys_manager_listener = keys_manager.clone();
 525         let payment_info: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
 526         let payment_info_for_events = payment_info.clone();
 527         let network = args.network;
 528         let bitcoind_rpc = bitcoind_client.clone();
 529         tokio::spawn(async move {
 530                 handle_ldk_events(
 531                         peer_manager_event_listener,
 532                         channel_manager_event_listener,
 533                         chain_monitor_event_listener,
 534                         bitcoind_rpc,
 535                         keys_manager_listener,
 536                         payment_info_for_events,
 537                         network,
 538                 )
 539                 .await;
 540         });
 541
 542         // Reconnect to channel peers if possible.
 543         let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
 544         match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
 545                 Ok(mut info) => {
 546                         for (pubkey, peer_addr) in info.drain() {
 547                                 for chan_info in channel_manager.list_channels() {
 548                                         if pubkey == chan_info.remote_network_id {
 549                                                 let _ = cli::connect_peer_if_necessary(
 550                                                         pubkey,
 551                                                         peer_addr,
 552                                                         peer_manager.clone(),
 553                                                         event_ntfn_sender.clone(),
 554                                                 );
 555                                         }
 556                                 }
 557                         }
 558                 }
 559                 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
 560         }
 561
 562         // Start the CLI.
 563         cli::poll_for_user_input(
 564                 peer_manager.clone(),
 565                 channel_manager.clone(),
 566                 router.clone(),
 567                 payment_info,
 568                 keys_manager.get_node_secret(),
 569                 event_ntfn_sender,
 570                 ldk_data_dir.clone(),
 571                 logger.clone(),
 572                 args.network,
 573         )
 574         .await;
 575 }