1 pub mod bitcoind_client;
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;
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::{BestBlock, Filter, Watch};
23 use lightning::ln::channelmanager;
24 use lightning::ln::channelmanager::{
25 ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
27 use lightning::ln::peer_handler::{MessageHandler, SimpleArcPeerManager};
28 use lightning::ln::{PaymentHash, PaymentPreimage, PaymentSecret};
29 use lightning::routing::network_graph::NetGraphMsgHandler;
30 use lightning::util::config::UserConfig;
31 use lightning::util::events::Event;
32 use lightning::util::ser::ReadableArgs;
33 use lightning_background_processor::BackgroundProcessor;
34 use lightning_block_sync::init;
35 use lightning_block_sync::poll;
36 use lightning_block_sync::SpvClient;
37 use lightning_block_sync::UnboundedCache;
38 use lightning_net_tokio::SocketDescriptor;
39 use lightning_persister::FilesystemPersister;
40 use rand::{thread_rng, Rng};
41 use std::collections::hash_map::Entry;
42 use std::collections::HashMap;
50 use std::sync::{Arc, Mutex};
51 use std::time::{Duration, SystemTime};
53 pub(crate) enum HTLCStatus {
59 pub(crate) struct MillisatAmount(Option<u64>);
61 impl fmt::Display for MillisatAmount {
62 fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
64 Some(amt) => write!(f, "{}", amt),
65 None => write!(f, "unknown"),
70 pub(crate) struct PaymentInfo {
71 preimage: Option<PaymentPreimage>,
72 secret: Option<PaymentSecret>,
74 amt_msat: MillisatAmount,
77 pub(crate) type PaymentInfoStorage = Arc<Mutex<HashMap<PaymentHash, PaymentInfo>>>;
79 type ChainMonitor = chainmonitor::ChainMonitor<
81 Arc<dyn Filter + Send + Sync>,
84 Arc<FilesystemLogger>,
85 Arc<FilesystemPersister>,
88 pub(crate) type PeerManager = SimpleArcPeerManager<
93 dyn chain::Access + Send + Sync,
97 pub(crate) type ChannelManager =
98 SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
100 async fn handle_ldk_events(
101 channel_manager: Arc<ChannelManager>, bitcoind_client: Arc<BitcoindClient>,
102 keys_manager: Arc<KeysManager>, inbound_payments: PaymentInfoStorage,
103 outbound_payments: PaymentInfoStorage, network: Network, event: Event,
106 Event::FundingGenerationReady {
107 temporary_channel_id,
108 channel_value_satoshis,
112 // Construct the raw transaction with one output, that is paid the amount of the
114 let addr = WitnessProgram::from_scriptpubkey(
117 Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
118 Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
119 Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
120 Network::Signet => panic!("Signet unsupported"),
123 .expect("Lightning funding tx should always be to a SegWit output")
125 let mut outputs = vec![HashMap::with_capacity(1)];
126 outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
127 let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
129 // Have your wallet put the inputs into the transaction such that the output is
131 let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
132 let change_output_position = funded_tx.changepos;
133 assert!(change_output_position == 0 || change_output_position == 1);
135 // Sign the final funding transaction and broadcast it.
136 let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
137 assert_eq!(signed_tx.complete, true);
138 let final_tx: Transaction =
139 encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
140 // Give the funding transaction back to LDK for opening the channel.
142 .funding_transaction_generated(&temporary_channel_id, final_tx)
146 "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
148 io::stdout().flush().unwrap();
151 Event::PaymentReceived { payment_hash, payment_preimage, payment_secret, amt, .. } => {
152 let mut payments = inbound_payments.lock().unwrap();
153 let status = match channel_manager.claim_funds(payment_preimage.unwrap()) {
156 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
157 hex_utils::hex_str(&payment_hash.0),
161 io::stdout().flush().unwrap();
162 HTLCStatus::Succeeded
164 _ => HTLCStatus::Failed,
166 match payments.entry(payment_hash) {
167 Entry::Occupied(mut e) => {
168 let payment = e.get_mut();
169 payment.status = status;
170 payment.preimage = Some(payment_preimage.unwrap());
171 payment.secret = Some(payment_secret);
173 Entry::Vacant(e) => {
174 e.insert(PaymentInfo {
175 preimage: Some(payment_preimage.unwrap()),
176 secret: Some(payment_secret),
178 amt_msat: MillisatAmount(Some(amt)),
183 Event::PaymentSent { payment_preimage } => {
184 let hashed = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
185 let mut payments = outbound_payments.lock().unwrap();
186 for (payment_hash, payment) in payments.iter_mut() {
187 if *payment_hash == hashed {
188 payment.preimage = Some(payment_preimage);
189 payment.status = HTLCStatus::Succeeded;
191 "\nEVENT: successfully sent payment of {} millisatoshis from \
192 payment hash {:?} with preimage {:?}",
194 hex_utils::hex_str(&payment_hash.0),
195 hex_utils::hex_str(&payment_preimage.0)
198 io::stdout().flush().unwrap();
202 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
204 "\nEVENT: Failed to send payment to payment hash {:?}: ",
205 hex_utils::hex_str(&payment_hash.0)
207 if rejected_by_dest {
208 println!("re-attempting the payment will not succeed");
210 println!("payment may be retried");
213 io::stdout().flush().unwrap();
215 let mut payments = outbound_payments.lock().unwrap();
216 if payments.contains_key(&payment_hash) {
217 let payment = payments.get_mut(&payment_hash).unwrap();
218 payment.status = HTLCStatus::Failed;
221 Event::PendingHTLCsForwardable { time_forwardable } => {
222 let forwarding_channel_manager = channel_manager.clone();
223 tokio::spawn(async move {
224 let min = time_forwardable.as_millis() as u64;
225 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
226 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
227 forwarding_channel_manager.process_pending_htlc_forwards();
230 Event::SpendableOutputs { outputs } => {
231 let destination_address = bitcoind_client.get_new_address().await;
232 let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
234 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
235 let spending_tx = keys_manager
236 .spend_spendable_outputs(
239 destination_address.script_pubkey(),
244 bitcoind_client.broadcast_transaction(&spending_tx);
249 async fn start_ldk() {
250 let args = match cli::parse_startup_args() {
251 Ok(user_args) => user_args,
255 // Initialize the LDK data directory if necessary.
256 let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
257 fs::create_dir_all(ldk_data_dir.clone()).unwrap();
259 // Initialize our bitcoind client.
260 let bitcoind_client = match BitcoindClient::new(
261 args.bitcoind_rpc_host.clone(),
262 args.bitcoind_rpc_port,
263 args.bitcoind_rpc_username.clone(),
264 args.bitcoind_rpc_password.clone(),
268 Ok(client) => Arc::new(client),
270 println!("Failed to connect to bitcoind client: {}", e);
275 // Check that the bitcoind we've connected to is running the network we expect
276 let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
278 != match args.network {
279 bitcoin::Network::Bitcoin => "main",
280 bitcoin::Network::Testnet => "test",
281 bitcoin::Network::Regtest => "regtest",
282 bitcoin::Network::Signet => "signet",
285 "Chain argument ({}) didn't match bitcoind chain ({})",
286 args.network, bitcoind_chain
292 // Step 1: Initialize the FeeEstimator
294 // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
295 let fee_estimator = bitcoind_client.clone();
297 // Step 2: Initialize the Logger
298 let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
300 // Step 3: Initialize the BroadcasterInterface
302 // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
304 let broadcaster = bitcoind_client.clone();
306 // Step 4: Initialize Persist
307 let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
309 // Step 5: Initialize the ChainMonitor
310 let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
314 fee_estimator.clone(),
318 // Step 6: Initialize the KeysManager
320 // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
321 // other secret key material.
322 let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
323 let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
324 assert_eq!(seed.len(), 32);
325 let mut key = [0; 32];
326 key.copy_from_slice(&seed);
329 let mut key = [0; 32];
330 thread_rng().fill_bytes(&mut key);
331 match File::create(keys_seed_path.clone()) {
333 f.write_all(&key).expect("Failed to write node keys seed to disk");
334 f.sync_all().expect("Failed to sync node keys seed to disk");
337 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
343 let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
344 let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
346 // Step 7: Read ChannelMonitor state from disk
347 let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
349 // Step 8: Initialize the ChannelManager
350 let user_config = UserConfig::default();
351 let mut restarting_node = true;
352 let (channel_manager_blockhash, mut channel_manager) = {
353 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
354 let mut channel_monitor_mut_references = Vec::new();
355 for (_, channel_monitor) in channelmonitors.iter_mut() {
356 channel_monitor_mut_references.push(channel_monitor);
358 let read_args = ChannelManagerReadArgs::new(
359 keys_manager.clone(),
360 fee_estimator.clone(),
361 chain_monitor.clone(),
365 channel_monitor_mut_references,
367 <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
369 // We're starting a fresh node.
370 restarting_node = false;
371 let getinfo_resp = bitcoind_client.get_blockchain_info().await;
373 let chain_params = ChainParameters {
374 network: args.network,
375 best_block: BestBlock::new(
376 getinfo_resp.latest_blockhash,
377 getinfo_resp.latest_height as u32,
380 let fresh_channel_manager = channelmanager::ChannelManager::new(
381 fee_estimator.clone(),
382 chain_monitor.clone(),
385 keys_manager.clone(),
389 (getinfo_resp.latest_blockhash, fresh_channel_manager)
393 // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
394 let mut chain_listener_channel_monitors = Vec::new();
395 let mut cache = UnboundedCache::new();
396 let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
398 let mut chain_listeners =
399 vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
401 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
402 let outpoint = channel_monitor.get_funding_txo().0;
403 chain_listener_channel_monitors.push((
405 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
410 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
411 chain_listeners.push((
412 monitor_listener_info.0,
413 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
417 init::synchronize_listeners(
418 &mut bitcoind_client.deref(),
428 // Step 10: Give ChannelMonitors to ChainMonitor
429 for item in chain_listener_channel_monitors.drain(..) {
430 let channel_monitor = item.1 .0;
431 let funding_outpoint = item.2;
432 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
435 // Step 11: Optional: Initialize the NetGraphMsgHandler
436 let genesis = genesis_block(args.network).header.block_hash();
437 let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
438 let network_graph = disk::read_network(Path::new(&network_graph_path), genesis);
439 let router = Arc::new(NetGraphMsgHandler::from_net_graph(
440 None::<Arc<dyn chain::Access + Send + Sync>>,
444 let router_persist = Arc::clone(&router);
445 tokio::spawn(async move {
446 let mut interval = tokio::time::interval(Duration::from_secs(600));
448 interval.tick().await;
449 if disk::persist_network(
450 Path::new(&network_graph_path),
451 &*router_persist.network_graph.read().unwrap(),
455 // Persistence errors here are non-fatal as we can just fetch the routing graph
456 // again later, but they may indicate a disk error which could be fatal elsewhere.
458 "Warning: Failed to persist network graph, check your disk and permissions"
464 // Step 12: Initialize the PeerManager
465 let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
466 let mut ephemeral_bytes = [0; 32];
467 rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
468 let lightning_msg_handler =
469 MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
470 let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
471 lightning_msg_handler,
472 keys_manager.get_node_secret(),
478 // Step 13: Initialize networking
480 let peer_manager_connection_handler = peer_manager.clone();
481 let listening_port = args.ldk_peer_listening_port;
482 tokio::spawn(async move {
483 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
485 .expect("Failed to bind to listen port - is something else already listening on it?");
487 let peer_mgr = peer_manager_connection_handler.clone();
488 let tcp_stream = listener.accept().await.unwrap().0;
489 tokio::spawn(async move {
490 lightning_net_tokio::setup_inbound(
492 tcp_stream.into_std().unwrap(),
499 // Step 14: Connect and Disconnect Blocks
500 if chain_tip.is_none() {
502 Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
504 let channel_manager_listener = channel_manager.clone();
505 let chain_monitor_listener = chain_monitor.clone();
506 let bitcoind_block_source = bitcoind_client.clone();
507 let network = args.network;
508 tokio::spawn(async move {
509 let mut derefed = bitcoind_block_source.deref();
510 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
511 let chain_listener = (chain_monitor_listener, channel_manager_listener);
513 SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
515 spv_client.poll_best_tip().await.unwrap();
516 tokio::time::sleep(Duration::from_secs(1)).await;
520 // Step 15: Handle LDK Events
521 let channel_manager_event_listener = channel_manager.clone();
522 let keys_manager_listener = keys_manager.clone();
523 // TODO: persist payment info to disk
524 let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
525 let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
526 let inbound_pmts_for_events = inbound_payments.clone();
527 let outbound_pmts_for_events = outbound_payments.clone();
528 let network = args.network;
529 let bitcoind_rpc = bitcoind_client.clone();
530 let handle = tokio::runtime::Handle::current();
531 let event_handler = move |event| {
532 handle.block_on(handle_ldk_events(
533 channel_manager_event_listener.clone(),
534 bitcoind_rpc.clone(),
535 keys_manager_listener.clone(),
536 inbound_pmts_for_events.clone(),
537 outbound_pmts_for_events.clone(),
542 // Step 16: Persist ChannelManager
543 let data_dir = ldk_data_dir.clone();
544 let persist_channel_manager_callback =
545 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
546 // Step 17: Background Processing
547 BackgroundProcessor::start(
548 persist_channel_manager_callback,
550 chain_monitor.clone(),
551 channel_manager.clone(),
552 peer_manager.clone(),
556 // Reconnect to channel peers if possible.
557 let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
558 match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
560 for (pubkey, peer_addr) in info.drain() {
561 for chan_info in channel_manager.list_channels() {
562 if pubkey == chan_info.counterparty.node_id {
564 cli::connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone())
570 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
573 // Regularly broadcast our node_announcement. This is only required (or possible) if we have
574 // some public channels, and is only useful if we have public listen address(es) to announce.
575 // In a production environment, this should occur only after the announcement of new channels
576 // to avoid churn in the global network graph.
577 let chan_manager = Arc::clone(&channel_manager);
578 let network = args.network;
579 if !args.ldk_announced_listen_addr.is_empty() {
580 tokio::spawn(async move {
581 let mut interval = tokio::time::interval(Duration::from_secs(60));
583 interval.tick().await;
584 chan_manager.broadcast_node_announcement(
586 args.ldk_announced_node_name,
587 args.ldk_announced_listen_addr.clone(),
594 cli::poll_for_user_input(
595 peer_manager.clone(),
596 channel_manager.clone(),
597 keys_manager.clone(),
601 ldk_data_dir.clone(),
609 pub async fn main() {