-fn main() {
- println!("Hello, world!");
+mod args;
+pub mod bitcoind_client;
+mod cli;
+mod convert;
+mod disk;
+mod hex_utils;
+mod sweep;
+
+use crate::bitcoind_client::BitcoindClient;
+use crate::disk::FilesystemLogger;
+use bitcoin::blockdata::transaction::Transaction;
+use bitcoin::consensus::encode;
+use bitcoin::network::constants::Network;
+use bitcoin::BlockHash;
+use bitcoin_bech32::WitnessProgram;
+use disk::{INBOUND_PAYMENTS_FNAME, OUTBOUND_PAYMENTS_FNAME};
+use lightning::chain::{chainmonitor, ChannelMonitorUpdateStatus};
+use lightning::chain::{Filter, Watch};
+use lightning::events::bump_transaction::{BumpTransactionEventHandler, Wallet};
+use lightning::events::{Event, PaymentFailureReason, PaymentPurpose};
+use lightning::ln::channelmanager::{self, RecentPaymentDetails};
+use lightning::ln::channelmanager::{
+ ChainParameters, ChannelManagerReadArgs, SimpleArcChannelManager,
+};
+use lightning::ln::msgs::DecodeError;
+use lightning::ln::peer_handler::{IgnoringMessageHandler, MessageHandler, SimpleArcPeerManager};
+use lightning::ln::{ChannelId, PaymentHash, PaymentPreimage, PaymentSecret};
+use lightning::onion_message::{DefaultMessageRouter, SimpleArcOnionMessenger};
+use lightning::routing::gossip;
+use lightning::routing::gossip::{NodeId, P2PGossipSync};
+use lightning::routing::router::DefaultRouter;
+use lightning::routing::scoring::ProbabilisticScoringFeeParameters;
+use lightning::sign::{EntropySource, InMemorySigner, KeysManager, SpendableOutputDescriptor};
+use lightning::util::config::UserConfig;
+use lightning::util::persist::{self, KVStore, MonitorUpdatingPersister};
+use lightning::util::ser::{Readable, ReadableArgs, Writeable, Writer};
+use lightning::{chain, impl_writeable_tlv_based, impl_writeable_tlv_based_enum};
+use lightning_background_processor::{process_events_async, GossipSync};
+use lightning_block_sync::init;
+use lightning_block_sync::poll;
+use lightning_block_sync::SpvClient;
+use lightning_block_sync::UnboundedCache;
+use lightning_net_tokio::SocketDescriptor;
+use lightning_persister::fs_store::FilesystemStore;
+use rand::{thread_rng, Rng};
+use std::collections::hash_map::Entry;
+use std::collections::HashMap;
+use std::convert::TryInto;
+use std::fmt;
+use std::fs;
+use std::fs::File;
+use std::io;
+use std::io::Write;
+use std::path::Path;
+use std::sync::atomic::{AtomicBool, Ordering};
+use std::sync::{Arc, Mutex, RwLock};
+use std::time::{Duration, SystemTime};
+
+pub(crate) const PENDING_SPENDABLE_OUTPUT_DIR: &'static str = "pending_spendable_outputs";
+
+#[derive(Copy, Clone)]
+pub(crate) enum HTLCStatus {
+ Pending,
+ Succeeded,
+ Failed,
+}
+
+impl_writeable_tlv_based_enum!(HTLCStatus,
+ (0, Pending) => {},
+ (1, Succeeded) => {},
+ (2, Failed) => {};
+);
+
+pub(crate) struct MillisatAmount(Option<u64>);
+
+impl fmt::Display for MillisatAmount {
+ fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
+ match self.0 {
+ Some(amt) => write!(f, "{}", amt),
+ None => write!(f, "unknown"),
+ }
+ }
+}
+
+impl Readable for MillisatAmount {
+ fn read<R: io::Read>(r: &mut R) -> Result<Self, DecodeError> {
+ let amt: Option<u64> = Readable::read(r)?;
+ Ok(MillisatAmount(amt))
+ }
+}
+
+impl Writeable for MillisatAmount {
+ fn write<W: Writer>(&self, w: &mut W) -> Result<(), std::io::Error> {
+ self.0.write(w)
+ }
+}
+
+pub(crate) struct PaymentInfo {
+ preimage: Option<PaymentPreimage>,
+ secret: Option<PaymentSecret>,
+ status: HTLCStatus,
+ amt_msat: MillisatAmount,
+}
+
+impl_writeable_tlv_based!(PaymentInfo, {
+ (0, preimage, required),
+ (2, secret, required),
+ (4, status, required),
+ (6, amt_msat, required),
+});
+
+pub(crate) struct PaymentInfoStorage {
+ payments: HashMap<PaymentHash, PaymentInfo>,
+}
+
+impl_writeable_tlv_based!(PaymentInfoStorage, {
+ (0, payments, required),
+});
+
+type ChainMonitor = chainmonitor::ChainMonitor<
+ InMemorySigner,
+ Arc<dyn Filter + Send + Sync>,
+ Arc<BitcoindClient>,
+ Arc<BitcoindClient>,
+ Arc<FilesystemLogger>,
+ Arc<
+ MonitorUpdatingPersister<
+ Arc<FilesystemStore>,
+ Arc<FilesystemLogger>,
+ Arc<KeysManager>,
+ Arc<KeysManager>,
+ >,
+ >,
+>;
+
+pub(crate) type GossipVerifier = lightning_block_sync::gossip::GossipVerifier<
+ lightning_block_sync::gossip::TokioSpawner,
+ Arc<lightning_block_sync::rpc::RpcClient>,
+ Arc<FilesystemLogger>,
+ SocketDescriptor,
+ Arc<ChannelManager>,
+ Arc<OnionMessenger>,
+ IgnoringMessageHandler,
+ Arc<KeysManager>,
+>;
+
+pub(crate) type PeerManager = SimpleArcPeerManager<
+ SocketDescriptor,
+ ChainMonitor,
+ BitcoindClient,
+ BitcoindClient,
+ GossipVerifier,
+ FilesystemLogger,
+>;
+
+pub(crate) type ChannelManager =
+ SimpleArcChannelManager<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
+
+pub(crate) type NetworkGraph = gossip::NetworkGraph<Arc<FilesystemLogger>>;
+
+type OnionMessenger =
+ SimpleArcOnionMessenger<ChainMonitor, BitcoindClient, BitcoindClient, FilesystemLogger>;
+
+pub(crate) type BumpTxEventHandler = BumpTransactionEventHandler<
+ Arc<BitcoindClient>,
+ Arc<Wallet<Arc<BitcoindClient>, Arc<FilesystemLogger>>>,
+ Arc<KeysManager>,
+ Arc<FilesystemLogger>,
+>;
+
+async fn handle_ldk_events(
+ channel_manager: &Arc<ChannelManager>, bitcoind_client: &BitcoindClient,
+ network_graph: &NetworkGraph, keys_manager: &KeysManager,
+ bump_tx_event_handler: &BumpTxEventHandler, inbound_payments: Arc<Mutex<PaymentInfoStorage>>,
+ outbound_payments: Arc<Mutex<PaymentInfoStorage>>, fs_store: &Arc<FilesystemStore>,
+ network: Network, event: Event,
+) {
+ match event {
+ Event::FundingGenerationReady {
+ temporary_channel_id,
+ counterparty_node_id,
+ channel_value_satoshis,
+ output_script,
+ ..
+ } => {
+ // Construct the raw transaction with one output, that is paid the amount of the
+ // channel.
+ let addr = WitnessProgram::from_scriptpubkey(
+ &output_script[..],
+ match network {
+ Network::Bitcoin => bitcoin_bech32::constants::Network::Bitcoin,
+ Network::Testnet => bitcoin_bech32::constants::Network::Testnet,
+ Network::Regtest => bitcoin_bech32::constants::Network::Regtest,
+ Network::Signet => bitcoin_bech32::constants::Network::Signet,
+ },
+ )
+ .expect("Lightning funding tx should always be to a SegWit output")
+ .to_address();
+ let mut outputs = vec![HashMap::with_capacity(1)];
+ outputs[0].insert(addr, channel_value_satoshis as f64 / 100_000_000.0);
+ let raw_tx = bitcoind_client.create_raw_transaction(outputs).await;
+
+ // Have your wallet put the inputs into the transaction such that the output is
+ // satisfied.
+ let funded_tx = bitcoind_client.fund_raw_transaction(raw_tx).await;
+
+ // Sign the final funding transaction and broadcast it.
+ let signed_tx = bitcoind_client.sign_raw_transaction_with_wallet(funded_tx.hex).await;
+ assert_eq!(signed_tx.complete, true);
+ let final_tx: Transaction =
+ encode::deserialize(&hex_utils::to_vec(&signed_tx.hex).unwrap()).unwrap();
+ // Give the funding transaction back to LDK for opening the channel.
+ if channel_manager
+ .funding_transaction_generated(
+ &temporary_channel_id,
+ &counterparty_node_id,
+ final_tx,
+ )
+ .is_err()
+ {
+ println!(
+ "\nERROR: Channel went away before we could fund it. The peer disconnected or refused the channel.");
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ }
+ Event::PaymentClaimable {
+ payment_hash,
+ purpose,
+ amount_msat,
+ receiver_node_id: _,
+ via_channel_id: _,
+ via_user_channel_id: _,
+ claim_deadline: _,
+ onion_fields: _,
+ counterparty_skimmed_fee_msat: _,
+ } => {
+ println!(
+ "\nEVENT: received payment from payment hash {} of {} millisatoshis",
+ payment_hash, amount_msat,
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ let payment_preimage = match purpose {
+ PaymentPurpose::InvoicePayment { payment_preimage, .. } => payment_preimage,
+ PaymentPurpose::SpontaneousPayment(preimage) => Some(preimage),
+ };
+ channel_manager.claim_funds(payment_preimage.unwrap());
+ }
+ Event::PaymentClaimed {
+ payment_hash,
+ purpose,
+ amount_msat,
+ receiver_node_id: _,
+ htlcs: _,
+ sender_intended_total_msat: _,
+ } => {
+ println!(
+ "\nEVENT: claimed payment from payment hash {} of {} millisatoshis",
+ payment_hash, amount_msat,
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ let (payment_preimage, payment_secret) = match purpose {
+ PaymentPurpose::InvoicePayment { payment_preimage, payment_secret, .. } => {
+ (payment_preimage, Some(payment_secret))
+ }
+ PaymentPurpose::SpontaneousPayment(preimage) => (Some(preimage), None),
+ };
+ let mut inbound = inbound_payments.lock().unwrap();
+ match inbound.payments.entry(payment_hash) {
+ Entry::Occupied(mut e) => {
+ let payment = e.get_mut();
+ payment.status = HTLCStatus::Succeeded;
+ payment.preimage = payment_preimage;
+ payment.secret = payment_secret;
+ }
+ Entry::Vacant(e) => {
+ e.insert(PaymentInfo {
+ preimage: payment_preimage,
+ secret: payment_secret,
+ status: HTLCStatus::Succeeded,
+ amt_msat: MillisatAmount(Some(amount_msat)),
+ });
+ }
+ }
+ fs_store.write("", "", INBOUND_PAYMENTS_FNAME, &inbound.encode()).unwrap();
+ }
+ Event::PaymentSent { payment_preimage, payment_hash, fee_paid_msat, .. } => {
+ let mut outbound = outbound_payments.lock().unwrap();
+ for (hash, payment) in outbound.payments.iter_mut() {
+ if *hash == payment_hash {
+ payment.preimage = Some(payment_preimage);
+ payment.status = HTLCStatus::Succeeded;
+ println!(
+ "\nEVENT: successfully sent payment of {} millisatoshis{} from \
+ payment hash {} with preimage {}",
+ payment.amt_msat,
+ if let Some(fee) = fee_paid_msat {
+ format!(" (fee {} msat)", fee)
+ } else {
+ "".to_string()
+ },
+ payment_hash,
+ payment_preimage
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ }
+ fs_store.write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound.encode()).unwrap();
+ }
+ Event::OpenChannelRequest {
+ ref temporary_channel_id, ref counterparty_node_id, ..
+ } => {
+ let mut random_bytes = [0u8; 16];
+ random_bytes.copy_from_slice(&keys_manager.get_secure_random_bytes()[..16]);
+ let user_channel_id = u128::from_be_bytes(random_bytes);
+ let res = channel_manager.accept_inbound_channel(
+ temporary_channel_id,
+ counterparty_node_id,
+ user_channel_id,
+ );
+
+ if let Err(e) = res {
+ print!(
+ "\nEVENT: Failed to accept inbound channel ({}) from {}: {:?}",
+ temporary_channel_id,
+ hex_utils::hex_str(&counterparty_node_id.serialize()),
+ e,
+ );
+ } else {
+ print!(
+ "\nEVENT: Accepted inbound channel ({}) from {}",
+ temporary_channel_id,
+ hex_utils::hex_str(&counterparty_node_id.serialize()),
+ );
+ }
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ Event::PaymentPathSuccessful { .. } => {}
+ Event::PaymentPathFailed { .. } => {}
+ Event::ProbeSuccessful { .. } => {}
+ Event::ProbeFailed { .. } => {}
+ Event::PaymentFailed { payment_hash, reason, .. } => {
+ print!(
+ "\nEVENT: Failed to send payment to payment hash {}: {:?}",
+ payment_hash,
+ if let Some(r) = reason { r } else { PaymentFailureReason::RetriesExhausted }
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+
+ let mut outbound = outbound_payments.lock().unwrap();
+ if outbound.payments.contains_key(&payment_hash) {
+ let payment = outbound.payments.get_mut(&payment_hash).unwrap();
+ payment.status = HTLCStatus::Failed;
+ }
+ fs_store.write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound.encode()).unwrap();
+ }
+ Event::InvoiceRequestFailed { payment_id } => {
+ print!("\nEVENT: Failed to request invoice to send payment with id {}", payment_id);
+ print!("> ");
+ io::stdout().flush().unwrap();
+
+ // TODO: mark the payment as failed
+ }
+ Event::PaymentForwarded {
+ prev_channel_id,
+ next_channel_id,
+ fee_earned_msat,
+ claim_from_onchain_tx,
+ outbound_amount_forwarded_msat,
+ } => {
+ let read_only_network_graph = network_graph.read_only();
+ let nodes = read_only_network_graph.nodes();
+ let channels = channel_manager.list_channels();
+
+ let node_str = |channel_id: &Option<ChannelId>| match channel_id {
+ None => String::new(),
+ Some(channel_id) => match channels.iter().find(|c| c.channel_id == *channel_id) {
+ None => String::new(),
+ Some(channel) => {
+ match nodes.get(&NodeId::from_pubkey(&channel.counterparty.node_id)) {
+ None => "private node".to_string(),
+ Some(node) => match &node.announcement_info {
+ None => "unnamed node".to_string(),
+ Some(announcement) => {
+ format!("node {}", announcement.alias)
+ }
+ },
+ }
+ }
+ },
+ };
+ let channel_str = |channel_id: &Option<ChannelId>| {
+ channel_id
+ .map(|channel_id| format!(" with channel {}", channel_id))
+ .unwrap_or_default()
+ };
+ let from_prev_str =
+ format!(" from {}{}", node_str(&prev_channel_id), channel_str(&prev_channel_id));
+ let to_next_str =
+ format!(" to {}{}", node_str(&next_channel_id), channel_str(&next_channel_id));
+
+ let from_onchain_str = if claim_from_onchain_tx {
+ "from onchain downstream claim"
+ } else {
+ "from HTLC fulfill message"
+ };
+ let amt_args = if let Some(v) = outbound_amount_forwarded_msat {
+ format!("{}", v)
+ } else {
+ "?".to_string()
+ };
+ if let Some(fee_earned) = fee_earned_msat {
+ println!(
+ "\nEVENT: Forwarded payment for {} msat{}{}, earning {} msat {}",
+ amt_args, from_prev_str, to_next_str, fee_earned, from_onchain_str
+ );
+ } else {
+ println!(
+ "\nEVENT: Forwarded payment for {} msat{}{}, claiming onchain {}",
+ amt_args, from_prev_str, to_next_str, from_onchain_str
+ );
+ }
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ Event::HTLCHandlingFailed { .. } => {}
+ Event::PendingHTLCsForwardable { time_forwardable } => {
+ let forwarding_channel_manager = channel_manager.clone();
+ let min = time_forwardable.as_millis() as u64;
+ tokio::spawn(async move {
+ let millis_to_sleep = thread_rng().gen_range(min, min * 5) as u64;
+ tokio::time::sleep(Duration::from_millis(millis_to_sleep)).await;
+ forwarding_channel_manager.process_pending_htlc_forwards();
+ });
+ }
+ Event::SpendableOutputs { outputs, channel_id: _ } => {
+ // SpendableOutputDescriptors, of which outputs is a vec of, are critical to keep track
+ // of! While a `StaticOutput` descriptor is just an output to a static, well-known key,
+ // other descriptors are not currently ever regenerated for you by LDK. Once we return
+ // from this method, the descriptor will be gone, and you may lose track of some funds.
+ //
+ // Here we simply persist them to disk, with a background task running which will try
+ // to spend them regularly (possibly duplicatively/RBF'ing them). These can just be
+ // treated as normal funds where possible - they are only spendable by us and there is
+ // no rush to claim them.
+ for output in outputs {
+ let key = hex_utils::hex_str(&keys_manager.get_secure_random_bytes());
+ // Note that if the type here changes our read code needs to change as well.
+ let output: SpendableOutputDescriptor = output;
+ fs_store.write(PENDING_SPENDABLE_OUTPUT_DIR, "", &key, &output.encode()).unwrap();
+ }
+ }
+ Event::ChannelPending { channel_id, counterparty_node_id, .. } => {
+ println!(
+ "\nEVENT: Channel {} with peer {} is pending awaiting funding lock-in!",
+ channel_id,
+ hex_utils::hex_str(&counterparty_node_id.serialize()),
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ Event::ChannelReady {
+ ref channel_id,
+ user_channel_id: _,
+ ref counterparty_node_id,
+ channel_type: _,
+ } => {
+ println!(
+ "\nEVENT: Channel {} with peer {} is ready to be used!",
+ channel_id,
+ hex_utils::hex_str(&counterparty_node_id.serialize()),
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ Event::ChannelClosed {
+ channel_id,
+ reason,
+ user_channel_id: _,
+ counterparty_node_id,
+ channel_capacity_sats: _,
+ } => {
+ println!(
+ "\nEVENT: Channel {} with counterparty {} closed due to: {:?}",
+ channel_id,
+ counterparty_node_id.map(|id| format!("{}", id)).unwrap_or("".to_owned()),
+ reason
+ );
+ print!("> ");
+ io::stdout().flush().unwrap();
+ }
+ Event::DiscardFunding { .. } => {
+ // A "real" node should probably "lock" the UTXOs spent in funding transactions until
+ // the funding transaction either confirms, or this event is generated.
+ }
+ Event::HTLCIntercepted { .. } => {}
+ Event::BumpTransaction(event) => bump_tx_event_handler.handle_event(&event),
+ }
+}
+
+async fn start_ldk() {
+ let args = match args::parse_startup_args() {
+ Ok(user_args) => user_args,
+ Err(()) => return,
+ };
+
+ // Initialize the LDK data directory if necessary.
+ let ldk_data_dir = format!("{}/.ldk", args.ldk_storage_dir_path);
+ fs::create_dir_all(ldk_data_dir.clone()).unwrap();
+
+ // ## Setup
+ // Step 1: Initialize the Logger
+ let logger = Arc::new(FilesystemLogger::new(ldk_data_dir.clone()));
+
+ // Initialize our bitcoind client.
+ let bitcoind_client = match BitcoindClient::new(
+ args.bitcoind_rpc_host.clone(),
+ args.bitcoind_rpc_port,
+ args.bitcoind_rpc_username.clone(),
+ args.bitcoind_rpc_password.clone(),
+ tokio::runtime::Handle::current(),
+ Arc::clone(&logger),
+ )
+ .await
+ {
+ Ok(client) => Arc::new(client),
+ Err(e) => {
+ println!("Failed to connect to bitcoind client: {}", e);
+ return;
+ }
+ };
+
+ // Check that the bitcoind we've connected to is running the network we expect
+ let bitcoind_chain = bitcoind_client.get_blockchain_info().await.chain;
+ if bitcoind_chain
+ != match args.network {
+ bitcoin::Network::Bitcoin => "main",
+ bitcoin::Network::Testnet => "test",
+ bitcoin::Network::Regtest => "regtest",
+ bitcoin::Network::Signet => "signet",
+ } {
+ println!(
+ "Chain argument ({}) didn't match bitcoind chain ({})",
+ args.network, bitcoind_chain
+ );
+ return;
+ }
+
+ // Step 2: Initialize the FeeEstimator
+
+ // BitcoindClient implements the FeeEstimator trait, so it'll act as our fee estimator.
+ let fee_estimator = bitcoind_client.clone();
+
+ // Step 3: Initialize the BroadcasterInterface
+
+ // BitcoindClient implements the BroadcasterInterface trait, so it'll act as our transaction
+ // broadcaster.
+ let broadcaster = bitcoind_client.clone();
+
+ // Step 4: Initialize the KeysManager
+
+ // The key seed that we use to derive the node privkey (that corresponds to the node pubkey) and
+ // other secret key material.
+ let keys_seed_path = format!("{}/keys_seed", ldk_data_dir.clone());
+ let keys_seed = if let Ok(seed) = fs::read(keys_seed_path.clone()) {
+ assert_eq!(seed.len(), 32);
+ let mut key = [0; 32];
+ key.copy_from_slice(&seed);
+ key
+ } else {
+ let mut key = [0; 32];
+ thread_rng().fill_bytes(&mut key);
+ match File::create(keys_seed_path.clone()) {
+ Ok(mut f) => {
+ Write::write_all(&mut f, &key).expect("Failed to write node keys seed to disk");
+ f.sync_all().expect("Failed to sync node keys seed to disk");
+ }
+ Err(e) => {
+ println!("ERROR: Unable to create keys seed file {}: {}", keys_seed_path, e);
+ return;
+ }
+ }
+ key
+ };
+ let cur = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap();
+ let keys_manager = Arc::new(KeysManager::new(&keys_seed, cur.as_secs(), cur.subsec_nanos()));
+
+ let bump_tx_event_handler = Arc::new(BumpTransactionEventHandler::new(
+ Arc::clone(&broadcaster),
+ Arc::new(Wallet::new(Arc::clone(&bitcoind_client), Arc::clone(&logger))),
+ Arc::clone(&keys_manager),
+ Arc::clone(&logger),
+ ));
+
+ // Step 5: Initialize Persistence
+ let fs_store = Arc::new(FilesystemStore::new(ldk_data_dir.clone().into()));
+ let persister = Arc::new(MonitorUpdatingPersister::new(
+ Arc::clone(&fs_store),
+ Arc::clone(&logger),
+ 1000,
+ Arc::clone(&keys_manager),
+ Arc::clone(&keys_manager),
+ ));
+ // Alternatively, you can use the `FilesystemStore` as a `Persist` directly, at the cost of
+ // larger `ChannelMonitor` update writes (but no deletion or cleanup):
+ //let persister = Arc::clone(&fs_store);
+
+ // Step 6: Initialize the ChainMonitor
+ let chain_monitor: Arc<ChainMonitor> = Arc::new(chainmonitor::ChainMonitor::new(
+ None,
+ Arc::clone(&broadcaster),
+ Arc::clone(&logger),
+ Arc::clone(&fee_estimator),
+ Arc::clone(&persister),
+ ));
+
+ // Step 7: Read ChannelMonitor state from disk
+ let mut channelmonitors = persister
+ .read_all_channel_monitors_with_updates(&bitcoind_client, &bitcoind_client)
+ .unwrap();
+ // If you are using the `FilesystemStore` as a `Persist` directly, use
+ // `lightning::util::persist::read_channel_monitors` like this:
+ //read_channel_monitors(Arc::clone(&persister), Arc::clone(&keys_manager), Arc::clone(&keys_manager)).unwrap();
+
+ // Step 8: Poll for the best chain tip, which may be used by the channel manager & spv client
+ let polled_chain_tip = init::validate_best_block_header(bitcoind_client.as_ref())
+ .await
+ .expect("Failed to fetch best block header and best block");
+
+ // Step 9: Initialize routing ProbabilisticScorer
+ let network_graph_path = format!("{}/network_graph", ldk_data_dir.clone());
+ let network_graph =
+ Arc::new(disk::read_network(Path::new(&network_graph_path), args.network, logger.clone()));
+
+ let scorer_path = format!("{}/scorer", ldk_data_dir.clone());
+ let scorer = Arc::new(RwLock::new(disk::read_scorer(
+ Path::new(&scorer_path),
+ Arc::clone(&network_graph),
+ Arc::clone(&logger),
+ )));
+
+ // Step 10: Create Router
+ let scoring_fee_params = ProbabilisticScoringFeeParameters::default();
+ let router = Arc::new(DefaultRouter::new(
+ network_graph.clone(),
+ logger.clone(),
+ keys_manager.get_secure_random_bytes(),
+ scorer.clone(),
+ scoring_fee_params,
+ ));
+
+ // Step 11: Initialize the ChannelManager
+ let mut user_config = UserConfig::default();
+ user_config.channel_handshake_limits.force_announced_channel_preference = false;
+ user_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
+ user_config.manually_accept_inbound_channels = true;
+ let mut restarting_node = true;
+ let (channel_manager_blockhash, channel_manager) = {
+ if let Ok(mut f) = fs::File::open(format!("{}/manager", ldk_data_dir.clone())) {
+ let mut channel_monitor_mut_references = Vec::new();
+ for (_, channel_monitor) in channelmonitors.iter_mut() {
+ channel_monitor_mut_references.push(channel_monitor);
+ }
+ let read_args = ChannelManagerReadArgs::new(
+ keys_manager.clone(),
+ keys_manager.clone(),
+ keys_manager.clone(),
+ fee_estimator.clone(),
+ chain_monitor.clone(),
+ broadcaster.clone(),
+ router,
+ logger.clone(),
+ user_config,
+ channel_monitor_mut_references,
+ );
+ <(BlockHash, ChannelManager)>::read(&mut f, read_args).unwrap()
+ } else {
+ // We're starting a fresh node.
+ restarting_node = false;
+
+ let polled_best_block = polled_chain_tip.to_best_block();
+ let polled_best_block_hash = polled_best_block.block_hash();
+ let chain_params =
+ ChainParameters { network: args.network, best_block: polled_best_block };
+ let fresh_channel_manager = channelmanager::ChannelManager::new(
+ fee_estimator.clone(),
+ chain_monitor.clone(),
+ broadcaster.clone(),
+ router,
+ logger.clone(),
+ keys_manager.clone(),
+ keys_manager.clone(),
+ keys_manager.clone(),
+ user_config,
+ chain_params,
+ cur.as_secs() as u32,
+ );
+ (polled_best_block_hash, fresh_channel_manager)
+ }
+ };
+
+ // Step 12: Sync ChannelMonitors and ChannelManager to chain tip
+ let mut chain_listener_channel_monitors = Vec::new();
+ let mut cache = UnboundedCache::new();
+ let chain_tip = if restarting_node {
+ let mut chain_listeners = vec![(
+ channel_manager_blockhash,
+ &channel_manager as &(dyn chain::Listen + Send + Sync),
+ )];
+
+ for (blockhash, channel_monitor) in channelmonitors.drain(..) {
+ let outpoint = channel_monitor.get_funding_txo().0;
+ chain_listener_channel_monitors.push((
+ blockhash,
+ (channel_monitor, broadcaster.clone(), fee_estimator.clone(), logger.clone()),
+ outpoint,
+ ));
+ }
+
+ for monitor_listener_info in chain_listener_channel_monitors.iter_mut() {
+ chain_listeners.push((
+ monitor_listener_info.0,
+ &monitor_listener_info.1 as &(dyn chain::Listen + Send + Sync),
+ ));
+ }
+
+ init::synchronize_listeners(
+ bitcoind_client.as_ref(),
+ args.network,
+ &mut cache,
+ chain_listeners,
+ )
+ .await
+ .unwrap()
+ } else {
+ polled_chain_tip
+ };
+
+ // Step 13: Give ChannelMonitors to ChainMonitor
+ for item in chain_listener_channel_monitors.drain(..) {
+ let channel_monitor = item.1 .0;
+ let funding_outpoint = item.2;
+ assert_eq!(
+ chain_monitor.watch_channel(funding_outpoint, channel_monitor),
+ Ok(ChannelMonitorUpdateStatus::Completed)
+ );
+ }
+
+ // Step 14: Optional: Initialize the P2PGossipSync
+ let gossip_sync =
+ Arc::new(P2PGossipSync::new(Arc::clone(&network_graph), None, Arc::clone(&logger)));
+
+ // Step 15: Initialize the PeerManager
+ let channel_manager: Arc<ChannelManager> = Arc::new(channel_manager);
+ let onion_messenger: Arc<OnionMessenger> = Arc::new(OnionMessenger::new(
+ Arc::clone(&keys_manager),
+ Arc::clone(&keys_manager),
+ Arc::clone(&logger),
+ Arc::new(DefaultMessageRouter {}),
+ Arc::clone(&channel_manager),
+ IgnoringMessageHandler {},
+ ));
+ let mut ephemeral_bytes = [0; 32];
+ let current_time = SystemTime::now().duration_since(SystemTime::UNIX_EPOCH).unwrap().as_secs();
+ rand::thread_rng().fill_bytes(&mut ephemeral_bytes);
+ let lightning_msg_handler = MessageHandler {
+ chan_handler: channel_manager.clone(),
+ route_handler: gossip_sync.clone(),
+ onion_message_handler: onion_messenger.clone(),
+ custom_message_handler: IgnoringMessageHandler {},
+ };
+ let peer_manager: Arc<PeerManager> = Arc::new(PeerManager::new(
+ lightning_msg_handler,
+ current_time.try_into().unwrap(),
+ &ephemeral_bytes,
+ logger.clone(),
+ Arc::clone(&keys_manager),
+ ));
+
+ // Install a GossipVerifier in in the P2PGossipSync
+ let utxo_lookup = GossipVerifier::new(
+ Arc::clone(&bitcoind_client.bitcoind_rpc_client),
+ lightning_block_sync::gossip::TokioSpawner,
+ Arc::clone(&gossip_sync),
+ Arc::clone(&peer_manager),
+ );
+ gossip_sync.add_utxo_lookup(Some(utxo_lookup));
+
+ // ## Running LDK
+ // Step 16: Initialize networking
+
+ let peer_manager_connection_handler = peer_manager.clone();
+ let listening_port = args.ldk_peer_listening_port;
+ let stop_listen_connect = Arc::new(AtomicBool::new(false));
+ let stop_listen = Arc::clone(&stop_listen_connect);
+ tokio::spawn(async move {
+ let listener = tokio::net::TcpListener::bind(format!("[::]:{}", listening_port))
+ .await
+ .expect("Failed to bind to listen port - is something else already listening on it?");
+ loop {
+ let peer_mgr = peer_manager_connection_handler.clone();
+ let tcp_stream = listener.accept().await.unwrap().0;
+ if stop_listen.load(Ordering::Acquire) {
+ return;
+ }
+ tokio::spawn(async move {
+ lightning_net_tokio::setup_inbound(
+ peer_mgr.clone(),
+ tcp_stream.into_std().unwrap(),
+ )
+ .await;
+ });
+ }
+ });
+
+ // Step 17: Connect and Disconnect Blocks
+ let channel_manager_listener = channel_manager.clone();
+ let chain_monitor_listener = chain_monitor.clone();
+ let bitcoind_block_source = bitcoind_client.clone();
+ let network = args.network;
+ tokio::spawn(async move {
+ let chain_poller = poll::ChainPoller::new(bitcoind_block_source.as_ref(), network);
+ let chain_listener = (chain_monitor_listener, channel_manager_listener);
+ let mut spv_client = SpvClient::new(chain_tip, chain_poller, &mut cache, &chain_listener);
+ loop {
+ spv_client.poll_best_tip().await.unwrap();
+ tokio::time::sleep(Duration::from_secs(1)).await;
+ }
+ });
+
+ let inbound_payments = Arc::new(Mutex::new(disk::read_payment_info(Path::new(&format!(
+ "{}/{}",
+ ldk_data_dir, INBOUND_PAYMENTS_FNAME
+ )))));
+ let outbound_payments = Arc::new(Mutex::new(disk::read_payment_info(Path::new(&format!(
+ "{}/{}",
+ ldk_data_dir, OUTBOUND_PAYMENTS_FNAME
+ )))));
+ let recent_payments_payment_hashes = channel_manager
+ .list_recent_payments()
+ .into_iter()
+ .filter_map(|p| match p {
+ RecentPaymentDetails::Pending { payment_hash, .. } => Some(payment_hash),
+ RecentPaymentDetails::Fulfilled { payment_hash, .. } => payment_hash,
+ RecentPaymentDetails::Abandoned { payment_hash, .. } => Some(payment_hash),
+ RecentPaymentDetails::AwaitingInvoice { payment_id: _ } => todo!(),
+ })
+ .collect::<Vec<PaymentHash>>();
+ for (payment_hash, payment_info) in outbound_payments
+ .lock()
+ .unwrap()
+ .payments
+ .iter_mut()
+ .filter(|(_, i)| matches!(i.status, HTLCStatus::Pending))
+ {
+ if !recent_payments_payment_hashes.contains(payment_hash) {
+ payment_info.status = HTLCStatus::Failed;
+ }
+ }
+ fs_store
+ .write("", "", OUTBOUND_PAYMENTS_FNAME, &outbound_payments.lock().unwrap().encode())
+ .unwrap();
+
+ // Step 18: Handle LDK Events
+ let channel_manager_event_listener = Arc::clone(&channel_manager);
+ let bitcoind_client_event_listener = Arc::clone(&bitcoind_client);
+ let network_graph_event_listener = Arc::clone(&network_graph);
+ let keys_manager_event_listener = Arc::clone(&keys_manager);
+ let inbound_payments_event_listener = Arc::clone(&inbound_payments);
+ let outbound_payments_event_listener = Arc::clone(&outbound_payments);
+ let fs_store_event_listener = Arc::clone(&fs_store);
+ let network = args.network;
+ let event_handler = move |event: Event| {
+ let channel_manager_event_listener = Arc::clone(&channel_manager_event_listener);
+ let bitcoind_client_event_listener = Arc::clone(&bitcoind_client_event_listener);
+ let network_graph_event_listener = Arc::clone(&network_graph_event_listener);
+ let keys_manager_event_listener = Arc::clone(&keys_manager_event_listener);
+ let bump_tx_event_handler = Arc::clone(&bump_tx_event_handler);
+ let inbound_payments_event_listener = Arc::clone(&inbound_payments_event_listener);
+ let outbound_payments_event_listener = Arc::clone(&outbound_payments_event_listener);
+ let fs_store_event_listener = Arc::clone(&fs_store_event_listener);
+ async move {
+ handle_ldk_events(
+ &channel_manager_event_listener,
+ &bitcoind_client_event_listener,
+ &network_graph_event_listener,
+ &keys_manager_event_listener,
+ &bump_tx_event_handler,
+ inbound_payments_event_listener,
+ outbound_payments_event_listener,
+ &fs_store_event_listener,
+ network,
+ event,
+ )
+ .await;
+ }
+ };
+
+ // Step 19: Persist ChannelManager and NetworkGraph
+ let persister = Arc::new(FilesystemStore::new(ldk_data_dir.clone().into()));
+
+ // Step 20: Background Processing
+ let (bp_exit, bp_exit_check) = tokio::sync::watch::channel(());
+ let mut background_processor = tokio::spawn(process_events_async(
+ Arc::clone(&persister),
+ event_handler,
+ chain_monitor.clone(),
+ channel_manager.clone(),
+ GossipSync::p2p(gossip_sync.clone()),
+ peer_manager.clone(),
+ logger.clone(),
+ Some(scorer.clone()),
+ move |t| {
+ let mut bp_exit_fut_check = bp_exit_check.clone();
+ Box::pin(async move {
+ tokio::select! {
+ _ = tokio::time::sleep(t) => false,
+ _ = bp_exit_fut_check.changed() => true,
+ }
+ })
+ },
+ false,
+ ));
+
+ // Regularly reconnect to channel peers.
+ let connect_cm = Arc::clone(&channel_manager);
+ let connect_pm = Arc::clone(&peer_manager);
+ let peer_data_path = format!("{}/channel_peer_data", ldk_data_dir);
+ let stop_connect = Arc::clone(&stop_listen_connect);
+ tokio::spawn(async move {
+ let mut interval = tokio::time::interval(Duration::from_secs(1));
+ interval.set_missed_tick_behavior(tokio::time::MissedTickBehavior::Delay);
+ loop {
+ interval.tick().await;
+ match disk::read_channel_peer_data(Path::new(&peer_data_path)) {
+ Ok(info) => {
+ let peers = connect_pm.get_peer_node_ids();
+ for node_id in connect_cm
+ .list_channels()
+ .iter()
+ .map(|chan| chan.counterparty.node_id)
+ .filter(|id| !peers.iter().any(|(pk, _)| id == pk))
+ {
+ if stop_connect.load(Ordering::Acquire) {
+ return;
+ }
+ for (pubkey, peer_addr) in info.iter() {
+ if *pubkey == node_id {
+ let _ = cli::do_connect_peer(
+ *pubkey,
+ peer_addr.clone(),
+ Arc::clone(&connect_pm),
+ )
+ .await;
+ }
+ }
+ }
+ }
+ Err(e) => println!("ERROR: errored reading channel peer info from disk: {:?}", e),
+ }
+ }
+ });
+
+ // Regularly broadcast our node_announcement. This is only required (or possible) if we have
+ // some public channels.
+ let peer_man = Arc::clone(&peer_manager);
+ let chan_man = Arc::clone(&channel_manager);
+ let network = args.network;
+ tokio::spawn(async move {
+ // First wait a minute until we have some peers and maybe have opened a channel.
+ tokio::time::sleep(Duration::from_secs(60)).await;
+ // Then, update our announcement once an hour to keep it fresh but avoid unnecessary churn
+ // in the global gossip network.
+ let mut interval = tokio::time::interval(Duration::from_secs(3600));
+ loop {
+ interval.tick().await;
+ // Don't bother trying to announce if we don't have any public channls, though our
+ // peers should drop such an announcement anyway. Note that announcement may not
+ // propagate until we have a channel with 6+ confirmations.
+ if chan_man.list_channels().iter().any(|chan| chan.is_public) {
+ peer_man.broadcast_node_announcement(
+ [0; 3],
+ args.ldk_announced_node_name,
+ args.ldk_announced_listen_addr.clone(),
+ );
+ }
+ }
+ });
+
+ tokio::spawn(sweep::periodic_sweep(
+ ldk_data_dir.clone(),
+ Arc::clone(&keys_manager),
+ Arc::clone(&logger),
+ Arc::clone(&persister),
+ Arc::clone(&bitcoind_client),
+ Arc::clone(&channel_manager),
+ ));
+
+ // Start the CLI.
+ let cli_channel_manager = Arc::clone(&channel_manager);
+ let cli_persister = Arc::clone(&persister);
+ let cli_logger = Arc::clone(&logger);
+ let cli_peer_manager = Arc::clone(&peer_manager);
+ let cli_poll = tokio::task::spawn_blocking(move || {
+ cli::poll_for_user_input(
+ cli_peer_manager,
+ cli_channel_manager,
+ keys_manager,
+ network_graph,
+ onion_messenger,
+ inbound_payments,
+ outbound_payments,
+ ldk_data_dir,
+ network,
+ cli_logger,
+ cli_persister,
+ )
+ });
+
+ // Exit if either CLI polling exits or the background processor exits (which shouldn't happen
+ // unless we fail to write to the filesystem).
+ let mut bg_res = Ok(Ok(()));
+ tokio::select! {
+ _ = cli_poll => {},
+ bg_exit = &mut background_processor => {
+ bg_res = bg_exit;
+ },
+ }
+
+ // Disconnect our peers and stop accepting new connections. This ensures we don't continue
+ // updating our channel data after we've stopped the background processor.
+ stop_listen_connect.store(true, Ordering::Release);
+ peer_manager.disconnect_all_peers();
+
+ if let Err(e) = bg_res {
+ let persist_res = persister
+ .write(
+ persist::CHANNEL_MANAGER_PERSISTENCE_PRIMARY_NAMESPACE,
+ persist::CHANNEL_MANAGER_PERSISTENCE_SECONDARY_NAMESPACE,
+ persist::CHANNEL_MANAGER_PERSISTENCE_KEY,
+ &channel_manager.encode(),
+ )
+ .unwrap();
+ use lightning::util::logger::Logger;
+ lightning::log_error!(
+ &*logger,
+ "Last-ditch ChannelManager persistence result: {:?}",
+ persist_res
+ );
+ panic!(
+ "ERR: background processing stopped with result {:?}, exiting.\n\
+ Last-ditch ChannelManager persistence result {:?}",
+ e, persist_res
+ );
+ }
+
+ // Stop the background processor.
+ if !bp_exit.is_closed() {
+ bp_exit.send(()).unwrap();
+ background_processor.await.unwrap().unwrap();
+ }
+}
+
+#[tokio::main]
+pub async fn main() {
+ #[cfg(not(target_os = "windows"))]
+ {
+ // Catch Ctrl-C with a dummy signal handler.
+ unsafe {
+ let mut new_action: libc::sigaction = core::mem::zeroed();
+ let mut old_action: libc::sigaction = core::mem::zeroed();
+
+ extern "C" fn dummy_handler(
+ _: libc::c_int, _: *const libc::siginfo_t, _: *const libc::c_void,
+ ) {
+ }
+
+ new_action.sa_sigaction = dummy_handler as libc::sighandler_t;
+ new_action.sa_flags = libc::SA_SIGINFO;
+
+ libc::sigaction(
+ libc::SIGINT,
+ &new_action as *const libc::sigaction,
+ &mut old_action as *mut libc::sigaction,
+ );
+ }
+ }
+
+ start_ldk().await;
}