WIP: Impl Anchors

TODO:
- Decide how to expose enforcing/non-enforcing anchors
- check reserve for enforcing variant

Author: tnull

src/builder.rs

@@ -548,12 +548,9 @@ fn build_with_store_internal<K: KVStore + Sync + Send + 'static>(
 	// Initialize the ChannelManager
 	let mut user_config = UserConfig::default();
 	user_config.channel_handshake_limits.force_announced_channel_preference = false;
+	user_config.manually_accept_inbound_channels = true;
+	user_config.channel_handshake_config.negotiate_anchors_zero_fee_htlc_tx = true;
 
-	if !config.trusted_peers_0conf.is_empty() {
-		// Manually accept inbound channels if we expect 0conf channel requests, avoid
-		// generating the events otherwise.
-		user_config.manually_accept_inbound_channels = true;
-	}
 	let channel_manager = {
 		if let Ok(mut reader) =
 			kv_store.read(CHANNEL_MANAGER_PERSISTENCE_NAMESPACE, CHANNEL_MANAGER_PERSISTENCE_KEY)

src/event.rs

@@ -1,6 +1,6 @@
 use crate::{
-	hex_utils, ChannelId, ChannelManager, Config, Error, KeysManager, NetworkGraph, UserChannelId,
-	Wallet,
+	hex_utils, BumpTransactionEventHandler, ChannelId, ChannelManager, Config, Error, KeysManager,
+	NetworkGraph, UserChannelId, Wallet,
 };
 
 use crate::payment_store::{
@@ -223,8 +223,9 @@ pub(crate) struct EventHandler<K: KVStore + Sync + Send, L: Deref>
 where
 	L::Target: Logger,
 {
-	wallet: Arc<Wallet<bdk::database::SqliteDatabase, L>>,
 	event_queue: Arc<EventQueue<K, L>>,
+	wallet: Arc<Wallet<bdk::database::SqliteDatabase, L>>,
+	bump_tx_event_handler: Arc<BumpTransactionEventHandler>,
 	channel_manager: Arc<ChannelManager<K>>,
 	network_graph: Arc<NetworkGraph>,
 	keys_manager: Arc<KeysManager>,
@@ -239,14 +240,16 @@ where
 	L::Target: Logger,
 {
 	pub fn new(
-		wallet: Arc<Wallet<bdk::database::SqliteDatabase, L>>, event_queue: Arc<EventQueue<K, L>>,
+		event_queue: Arc<EventQueue<K, L>>, wallet: Arc<Wallet<bdk::database::SqliteDatabase, L>>,
+		bump_tx_event_handler: Arc<BumpTransactionEventHandler>,
 		channel_manager: Arc<ChannelManager<K>>, network_graph: Arc<NetworkGraph>,
 		keys_manager: Arc<KeysManager>, payment_store: Arc<PaymentStore<K, L>>,
 		runtime: Arc<RwLock<Option<tokio::runtime::Runtime>>>, logger: L, config: Arc<Config>,
 	) -> Self {
 		Self {
 			event_queue,
 			wallet,
+			bump_tx_event_handler,
 			channel_manager,
 			network_graph,
 			keys_manager,
@@ -760,7 +763,9 @@ where
 			}
 			LdkEvent::DiscardFunding { .. } => {}
 			LdkEvent::HTLCIntercepted { .. } => {}
-			LdkEvent::BumpTransaction(_) => {}
+			LdkEvent::BumpTransaction(bte) => {
+				self.bump_tx_event_handler.handle_event(&bte);
+			}
 		}
 	}
 }

src/lib.rs

@@ -118,13 +118,17 @@ use io::KVStore;
 use payment_store::PaymentStore;
 pub use payment_store::{PaymentDetails, PaymentDirection, PaymentStatus};
 use peer_store::{PeerInfo, PeerStore};
-use types::{ChainMonitor, ChannelManager, KeysManager, NetworkGraph, PeerManager, Scorer};
+use types::{
+	BumpTransactionEventHandler, ChainMonitor, ChannelManager, KeysManager, NetworkGraph,
+	PeerManager, Scorer,
+};
 pub use types::{ChannelDetails, ChannelId, PeerDetails, UserChannelId};
 use wallet::Wallet;
 
 use logger::{log_error, log_info, log_trace, FilesystemLogger, Logger};
 
 use lightning::chain::Confirm;
+use lightning::events::bump_transaction::Wallet as LdkWallet;
 use lightning::ln::channelmanager::{self, PaymentId, RecipientOnionFields, Retry};
 use lightning::ln::{PaymentHash, PaymentPreimage};
 use lightning::sign::EntropySource;
@@ -634,9 +638,17 @@ impl<K: KVStore + Sync + Send + 'static> Node<K> {
 			}
 		});
 
-		let event_handler = Arc::new(EventHandler::new(
+		let bump_tx_event_handler = Arc::new(BumpTransactionEventHandler::new(
 			Arc::clone(&self.wallet),
+			Arc::new(LdkWallet::new(Arc::clone(&self.wallet))),
+			Arc::clone(&self.keys_manager),
+			Arc::clone(&self.logger),
+		));
+
+		let event_handler = Arc::new(EventHandler::new(
 			Arc::clone(&self.event_queue),
+			Arc::clone(&self.wallet),
+			bump_tx_event_handler,
 			Arc::clone(&self.channel_manager),
 			Arc::clone(&self.network_graph),
 			Arc::clone(&self.keys_manager),

src/types.rs

@@ -105,6 +105,18 @@ impl lightning::onion_message::MessageRouter for FakeMessageRouter {
 	}
 }
 
+pub(crate) type BumpTransactionEventHandler =
+	lightning::events::bump_transaction::BumpTransactionEventHandler<
+		Arc<Wallet<bdk::database::SqliteDatabase, Arc<FilesystemLogger>>>,
+		Arc<
+			lightning::events::bump_transaction::Wallet<
+				Arc<Wallet<bdk::database::SqliteDatabase, Arc<FilesystemLogger>>>,
+			>,
+		>,
+		Arc<WalletKeysManager<bdk::database::SqliteDatabase, Arc<FilesystemLogger>>>,
+		Arc<FilesystemLogger>,
+	>;
+
 /// The global identifier of a channel.
 ///
 /// Note that this will start out to be a temporary ID until channel funding negotiation is

src/wallet.rs

@@ -6,6 +6,7 @@ use lightning::chain::chaininterface::{
 	BroadcasterInterface, ConfirmationTarget, FeeEstimator, FEERATE_FLOOR_SATS_PER_KW,
 };
 
+use lightning::events::bump_transaction::{Utxo, WalletSource};
 use lightning::ln::msgs::{DecodeError, UnsignedGossipMessage};
 use lightning::ln::script::ShutdownScript;
 use lightning::sign::{
@@ -21,10 +22,13 @@ use bdk::wallet::AddressIndex;
 use bdk::{FeeRate, SignOptions, SyncOptions};
 
 use bitcoin::bech32::u5;
+use bitcoin::hashes::Hash;
 use bitcoin::secp256k1::ecdh::SharedSecret;
 use bitcoin::secp256k1::ecdsa::{RecoverableSignature, Signature};
 use bitcoin::secp256k1::{PublicKey, Scalar, Secp256k1, Signing};
-use bitcoin::{LockTime, PackedLockTime, Script, Transaction, TxOut, Txid};
+use bitcoin::util::address::WitnessVersion;
+use bitcoin::util::psbt::PartiallySignedTransaction;
+use bitcoin::{LockTime, PackedLockTime, Script, Transaction, TxOut, Txid, WPubkeyHash};
 
 use std::collections::HashMap;
 use std::ops::Deref;
@@ -347,6 +351,100 @@ where
 	}
 }
 
+impl<D, L: Deref> WalletSource for Wallet<D, L>
+where
+	D: BatchDatabase,
+	L::Target: Logger,
+{
+	fn list_confirmed_utxos(&self) -> Result<Vec<Utxo>, ()> {
+		let locked_wallet = self.inner.lock().unwrap();
+		let mut utxos = Vec::new();
+		let txs = locked_wallet.list_transactions(true).map_err(|e| {
+			log_error!(self.logger, "Failed to retrieve transactions from wallet: {}", e);
+		})?;
+		let unspent = locked_wallet.list_unspent().map_err(|e| {
+			log_error!(self.logger, "Failed to retrieve unspent transactions from wallet: {}", e);
+		})?;
+
+		for u in unspent {
+			for t in &txs {
+				if u.outpoint.txid == t.txid && t.confirmation_time.is_some() {
+					let payload =
+						bitcoin::util::address::Payload::from_script(&u.txout.script_pubkey)
+							.map_err(|e| {
+								log_error!(self.logger, "Failed to retrieve script payload: {}", e);
+							})?;
+
+					match payload {
+						bitcoin::util::address::Payload::WitnessProgram { version, program } => {
+							if version == WitnessVersion::V0 && program.len() == 20 {
+								let wpkh = WPubkeyHash::from_slice(&program).map_err(|e| {
+									log_error!(
+										self.logger,
+										"Failed to retrieve script payload: {}",
+										e
+									);
+								})?;
+								let utxo = Utxo::new_v0_p2wpkh(u.outpoint, u.txout.value, &wpkh);
+								utxos.push(utxo);
+							} else {
+								log_error!(
+									self.logger,
+									"Unexpected program length: {}",
+									program.len()
+								);
+							}
+						}
+						_ => {
+							log_error!(
+								self.logger,
+								"Tried to use a non-witness script. This must never happen."
+							);
+							panic!("Tried to use a non-witness script. This must never happen.");
+						}
+					}
+				}
+			}
+		}
+
+		Ok(utxos)
+	}
+
+	fn get_change_script(&self) -> Result<Script, ()> {
+		let locked_wallet = self.inner.lock().unwrap();
+		let address_info = locked_wallet.get_address(AddressIndex::New).map_err(|e| {
+			log_error!(self.logger, "Failed to retrieve new address from wallet: {}", e);
+		})?;
+
+		Ok(address_info.address.script_pubkey())
+	}
+
+	fn sign_tx(&self, tx: &mut Transaction) -> Result<(), ()> {
+		let locked_wallet = self.inner.lock().unwrap();
+
+		let mut psbt = PartiallySignedTransaction::from_unsigned_tx(tx.clone()).map_err(|e| {
+			log_error!(self.logger, "Failed to create PSBT: {}", e);
+		})?;
+
+		match locked_wallet.sign(&mut psbt, SignOptions::default()) {
+			Ok(finalized) => {
+				if !finalized {
+					log_error!(self.logger, "Failed to finalize PSBT.");
+					return Err(());
+				}
+			}
+			Err(err) => {
+				log_error!(self.logger, "Failed to sign transaction: {}", err);
+				return Err(());
+			}
+		}
+
+		*tx = psbt.extract_tx();
+
+		Ok(())
+	}
+}
+
 /// Similar to [`KeysManager`], but overrides the destination and shutdown scripts so they are
 /// directly spendable by the BDK wallet.
 pub struct WalletKeysManager<D, L: Deref>