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.
141 channel_manager.funding_transaction_generated(&temporary_channel_id, final_tx).unwrap();
143 Event::PaymentReceived { payment_hash, payment_preimage, payment_secret, amt, .. } => {
144 let mut payments = inbound_payments.lock().unwrap();
145 let status = match channel_manager.claim_funds(payment_preimage.unwrap()) {
148 "\nEVENT: received payment from payment hash {} of {} millisatoshis",
149 hex_utils::hex_str(&payment_hash.0),
153 io::stdout().flush().unwrap();
154 HTLCStatus::Succeeded
156 _ => HTLCStatus::Failed,
158 match payments.entry(payment_hash) {
159 Entry::Occupied(mut e) => {
160 let payment = e.get_mut();
161 payment.status = status;
162 payment.preimage = Some(payment_preimage.unwrap());
163 payment.secret = Some(payment_secret);
165 Entry::Vacant(e) => {
166 e.insert(PaymentInfo {
167 preimage: Some(payment_preimage.unwrap()),
168 secret: Some(payment_secret),
170 amt_msat: MillisatAmount(Some(amt)),
175 Event::PaymentSent { payment_preimage } => {
176 let hashed = PaymentHash(Sha256::hash(&payment_preimage.0).into_inner());
177 let mut payments = outbound_payments.lock().unwrap();
178 for (payment_hash, payment) in payments.iter_mut() {
179 if *payment_hash == hashed {
180 payment.preimage = Some(payment_preimage);
181 payment.status = HTLCStatus::Succeeded;
183 "\nEVENT: successfully sent payment of {} millisatoshis from \
184 payment hash {:?} with preimage {:?}",
186 hex_utils::hex_str(&payment_hash.0),
187 hex_utils::hex_str(&payment_preimage.0)
190 io::stdout().flush().unwrap();
194 Event::PaymentFailed { payment_hash, rejected_by_dest } => {
196 "\nEVENT: Failed to send payment to payment hash {:?}: ",
197 hex_utils::hex_str(&payment_hash.0)
199 if rejected_by_dest {
200 println!("re-attempting the payment will not succeed");
202 println!("payment may be retried");
205 io::stdout().flush().unwrap();
207 let mut payments = outbound_payments.lock().unwrap();
208 if payments.contains_key(&payment_hash) {
209 let payment = payments.get_mut(&payment_hash).unwrap();
210 payment.status = HTLCStatus::Failed;
213 Event::PendingHTLCsForwardable { time_forwardable } => {
214 let forwarding_channel_manager = channel_manager.clone();
215 tokio::spawn(async move {
216 let min = time_forwardable.as_millis() as u64;
217 let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
218 tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
219 forwarding_channel_manager.process_pending_htlc_forwards();
222 Event::SpendableOutputs { outputs } => {
223 let destination_address = bitcoind_client.get_new_address().await;
224 let output_descriptors = &outputs.iter().map(|a| a).collect::<Vec<_>>();
226 bitcoind_client.get_est_sat_per_1000_weight(ConfirmationTarget::Normal);
227 let spending_tx = keys_manager
228 .spend_spendable_outputs(
231 destination_address.script_pubkey(),
236 bitcoind_client.broadcast_transaction(&spending_tx);
241 async fn start_ldk() {
242 let args = match cli::parse_startup_args() {
243 Ok(user_args) => user_args,
247 // Initialize the LDK data directory if necessary.
248 let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
249 fs::create_dir_all(ldk_data_dir.clone()).unwrap();
251 // Initialize our bitcoind client.
252 let bitcoind_client = match BitcoindClient::new(
253 args.bitcoind_rpc_host.clone(),
254 args.bitcoind_rpc_port,
255 args.bitcoind_rpc_username.clone(),
256 args.bitcoind_rpc_password.clone(),
260 Ok(client) => Arc::new(client),
262 println!("Failed to connect to bitcoind client: {}", e);
267 // Check that the bitcoind we've connected to is running the network we expect
268 let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
270 != match args.network {
271 bitcoin::Network::Bitcoin => "main",
272 bitcoin::Network::Testnet => "test",
273 bitcoin::Network::Regtest => "regtest",
274 bitcoin::Network::Signet => "signet",
277 "Chain argument ({}) didn't match bitcoind chain ({})",
278 args.network, bitcoind_chain
284 // Step 1: Initialize the FeeEstimator
286 // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
287 let fee_estimator = bitcoind_client.clone();
289 // Step 2: Initialize the Logger
290 let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
292 // Step 3: Initialize the BroadcasterInterface
294 // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
296 let broadcaster = bitcoind_client.clone();
298 // Step 4: Initialize Persist
299 let persister = Arc::new(FilesystemPersister::new(ldk_data_dir.clone()));
301 // Step 5: Initialize the ChainMonitor
302 let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
306 fee_estimator.clone(),
310 // Step 6: Initialize the KeysManager
312 // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
313 // other secret key material.
314 let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
315 let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
316 assert_eq!(seed.len(), 32);
317 let mut key = [0; 32];
318 key.copy_from_slice(&seed);
321 let mut key = [0; 32];
322 thread_rng().fill_bytes(&mut key);
323 match File::create(keys_seed_path.clone()) {
325 f.write_all(&key).expect("Failed to write node keys seed to disk");
326 f.sync_all().expect("Failed to sync node keys seed to disk");
329 println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
335 let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
336 let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
338 // Step 7: Read ChannelMonitor state from disk
339 let mut channelmonitors = persister.read_channelmonitors(keys_manager.clone()).unwrap();
341 // Step 8: Initialize the ChannelManager
342 let user_config = UserConfig::default();
343 let mut restarting_node = true;
344 let (channel_manager_blockhash, mut channel_manager) = {
345 if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
346 let mut channel_monitor_mut_references = Vec::new();
347 for (_, channel_monitor) in channelmonitors.iter_mut() {
348 channel_monitor_mut_references.push(channel_monitor);
350 let read_args = ChannelManagerReadArgs::new(
351 keys_manager.clone(),
352 fee_estimator.clone(),
353 chain_monitor.clone(),
357 channel_monitor_mut_references,
359 <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
361 // We're starting a fresh node.
362 restarting_node = false;
363 let getinfo_resp = bitcoind_client.get_blockchain_info().await;
365 let chain_params = ChainParameters {
366 network: args.network,
367 best_block: BestBlock::new(
368 getinfo_resp.latest_blockhash,
369 getinfo_resp.latest_height as u32,
372 let fresh_channel_manager = channelmanager::ChannelManager::new(
373 fee_estimator.clone(),
374 chain_monitor.clone(),
377 keys_manager.clone(),
381 (getinfo_resp.latest_blockhash, fresh_channel_manager)
385 // Step 9: Sync ChannelMonitors and ChannelManager to chain tip
386 let mut chain_listener_channel_monitors = Vec::new();
387 let mut cache = UnboundedCache::new();
388 let mut chain_tip: Option<poll::ValidatedBlockHeader> = None;
390 let mut chain_listeners =
391 vec![(channel_manager_blockhash, &mut channel_manager as &mut dyn chain::Listen)];
393 for (blockhash, channel_monitor) in channelmonitors.drain(..) {
394 let outpoint = channel_monitor.get_funding_txo().0;
395 chain_listener_channel_monitors.push((
397 (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
402 for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
403 chain_listeners.push((
404 monitor_listener_info.0,
405 &mut monitor_listener_info.1 as &mut dyn chain::Listen,
409 init::synchronize_listeners(
410 &mut bitcoind_client.deref(),
420 // Step 10: Give ChannelMonitors to ChainMonitor
421 for item in chain_listener_channel_monitors.drain(..) {
422 let channel_monitor = item.1 .0;
423 let funding_outpoint = item.2;
424 chain_monitor.watch_channel(funding_outpoint, channel_monitor).unwrap();
427 // Step 11: Optional: Initialize the NetGraphMsgHandler
428 let genesis = genesis_block(args.network).header.block_hash();
429 let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
430 let network_graph = disk::read_network(Path::new(&network_graph_path), genesis);
431 let router = Arc::new(NetGraphMsgHandler::from_net_graph(
432 None::<Arc<dyn chain::Access + Send + Sync>>,
436 let router_persist = Arc::clone(&router);
437 tokio::spawn(async move {
438 let mut interval = tokio::time::interval(Duration::from_secs(600));
440 interval.tick().await;
441 if disk::persist_network(
442 Path::new(&network_graph_path),
443 &*router_persist.network_graph.read().unwrap(),
447 // Persistence errors here are non-fatal as we can just fetch the routing graph
448 // again later, but they may indicate a disk error which could be fatal elsewhere.
450 "Warning: Failed to persist network graph, check your disk and permissions"
456 // Step 12: Initialize the PeerManager
457 let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
458 let mut ephemeral_bytes = [0; 32];
459 rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
460 let lightning_msg_handler =
461 MessageHandler { chan_handler: channel_manager.clone(), route_handler: router.clone() };
462 let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
463 lightning_msg_handler,
464 keys_manager.get_node_secret(),
470 // Step 13: Initialize networking
472 let peer_manager_connection_handler = peer_manager.clone();
473 let listening_port = args.ldk_peer_listening_port;
474 tokio::spawn(async move {
475 let listener = tokio::net::TcpListener::bind(format!("0.0.0.0:{}", listening_port))
477 .expect("Failed to bind to listen port - is something else already listening on it?");
479 let peer_mgr = peer_manager_connection_handler.clone();
480 let tcp_stream = listener.accept().await.unwrap().0;
481 tokio::spawn(async move {
482 lightning_net_tokio::setup_inbound(
484 tcp_stream.into_std().unwrap(),
491 // Step 14: Connect and Disconnect Blocks
492 if chain_tip.is_none() {
494 Some(init::validate_best_block_header(&mut bitcoind_client.deref()).await.unwrap());
496 let channel_manager_listener = channel_manager.clone();
497 let chain_monitor_listener = chain_monitor.clone();
498 let bitcoind_block_source = bitcoind_client.clone();
499 let network = args.network;
500 tokio::spawn(async move {
501 let mut derefed = bitcoind_block_source.deref();
502 let chain_poller = poll::ChainPoller::new(&mut derefed, network);
503 let chain_listener = (chain_monitor_listener, channel_manager_listener);
505 SpvClient::new(chain_tip.unwrap(), chain_poller, &mut cache, &chain_listener);
507 spv_client.poll_best_tip().await.unwrap();
508 tokio::time::sleep(Duration::from_secs(1)).await;
512 // Step 15: Handle LDK Events
513 let channel_manager_event_listener = channel_manager.clone();
514 let keys_manager_listener = keys_manager.clone();
515 // TODO: persist payment info to disk
516 let inbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
517 let outbound_payments: PaymentInfoStorage = Arc::new(Mutex::new(HashMap::new()));
518 let inbound_pmts_for_events = inbound_payments.clone();
519 let outbound_pmts_for_events = outbound_payments.clone();
520 let network = args.network;
521 let bitcoind_rpc = bitcoind_client.clone();
522 let handle = tokio::runtime::Handle::current();
523 let event_handler = move |event| {
524 handle.block_on(handle_ldk_events(
525 channel_manager_event_listener.clone(),
526 bitcoind_rpc.clone(),
527 keys_manager_listener.clone(),
528 inbound_pmts_for_events.clone(),
529 outbound_pmts_for_events.clone(),
534 // Step 16: Persist ChannelManager
535 let data_dir = ldk_data_dir.clone();
536 let persist_channel_manager_callback =
537 move |node: &ChannelManager| FilesystemPersister::persist_manager(data_dir.clone(), &*node);
538 // Step 17: Background Processing
539 BackgroundProcessor::start(
540 persist_channel_manager_callback,
542 chain_monitor.clone(),
543 channel_manager.clone(),
544 peer_manager.clone(),
548 // Reconnect to channel peers if possible.
549 let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir.clone());
550 match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
552 for (pubkey, peer_addr) in info.drain() {
553 for chan_info in channel_manager.list_channels() {
554 if pubkey == chan_info.counterparty.node_id {
556 cli::connect_peer_if_necessary(pubkey, peer_addr, peer_manager.clone())
562 Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
565 // Regularly broadcast our node_announcement. This is only required (or possible) if we have
566 // some public channels, and is only useful if we have public listen address(es) to announce.
567 // In a production environment, this should occur only after the announcement of new channels
568 // to avoid churn in the global network graph.
569 let chan_manager = Arc::clone(&channel_manager);
570 let network = args.network;
571 if args.ldk_announced_listen_addr.is_some() {
572 tokio::spawn(async move {
573 let mut interval = tokio::time::interval(Duration::from_secs(60));
575 interval.tick().await;
576 chan_manager.broadcast_node_announcement(
578 args.ldk_announced_node_name,
579 vec![args.ldk_announced_listen_addr.as_ref().unwrap().clone()],
586 cli::poll_for_user_input(
587 peer_manager.clone(),
588 channel_manager.clone(),
589 keys_manager.clone(),
593 ldk_data_dir.clone(),
601 pub async fn main() {