}
impl HTLCDescriptor {
+ /// Returns the outpoint of the HTLC output in the commitment transaction. This is the outpoint
+ /// being spent by the HTLC input in the HTLC transaction.
+ pub fn outpoint(&self) -> OutPoint {
+ OutPoint {
+ txid: self.commitment_txid,
+ vout: self.htlc.transaction_output_index.unwrap(),
+ }
+ }
+
/// Returns the UTXO to be spent by the HTLC input, which can be obtained via
/// [`Self::unsigned_tx_input`].
pub fn previous_utxo<C: secp256k1::Signing + secp256k1::Verification>(&self, secp: &Secp256k1<C>) -> TxOut {
/// A wrapper over [`WalletSource`] that implements [`CoinSelection`] by preferring UTXOs that would
/// avoid conflicting double spends. If not enough UTXOs are available to do so, conflicting double
/// spends may happen.
-pub struct Wallet<W: Deref> where W::Target: WalletSource {
+pub struct Wallet<W: Deref, L: Deref>
+where
+ W::Target: WalletSource,
+ L::Target: Logger
+{
source: W,
+ logger: L,
// TODO: Do we care about cleaning this up once the UTXOs have a confirmed spend? We can do so
// by checking whether any UTXOs that exist in the map are no longer returned in
// `list_confirmed_utxos`.
locked_utxos: Mutex<HashMap<OutPoint, ClaimId>>,
}
-impl<W: Deref> Wallet<W> where W::Target: WalletSource {
+impl<W: Deref, L: Deref> Wallet<W, L>
+where
+ W::Target: WalletSource,
+ L::Target: Logger
+{
/// Returns a new instance backed by the given [`WalletSource`] that serves as an implementation
/// of [`CoinSelectionSource`].
- pub fn new(source: W) -> Self {
- Self { source, locked_utxos: Mutex::new(HashMap::new()) }
+ pub fn new(source: W, logger: L) -> Self {
+ Self { source, logger, locked_utxos: Mutex::new(HashMap::new()) }
}
/// Performs coin selection on the set of UTXOs obtained from
let mut eligible_utxos = utxos.iter().filter_map(|utxo| {
if let Some(utxo_claim_id) = locked_utxos.get(&utxo.outpoint) {
if *utxo_claim_id != claim_id && !force_conflicting_utxo_spend {
+ log_trace!(self.logger, "Skipping UTXO {} to prevent conflicting spend", utxo.outpoint);
return None;
}
}
if should_spend {
Some((utxo, fee_to_spend_utxo))
} else {
+ log_trace!(self.logger, "Skipping UTXO {} due to dust proximity after spend", utxo.outpoint);
None
}
}).collect::<Vec<_>>();
selected_utxos.push(utxo.clone());
}
if selected_amount < target_amount_sat + total_fees {
+ log_debug!(self.logger, "Insufficient funds to meet target feerate {} sat/kW",
+ target_feerate_sat_per_1000_weight);
return Err(());
}
for utxo in &selected_utxos {
);
let change_output_amount = remaining_amount.saturating_sub(change_output_fee);
let change_output = if change_output_amount < change_script.dust_value().to_sat() {
+ log_debug!(self.logger, "Coin selection attempt did not yield change output");
None
} else {
Some(TxOut { script_pubkey: change_script, value: change_output_amount })
}
}
-impl<W: Deref> CoinSelectionSource for Wallet<W> where W::Target: WalletSource {
+impl<W: Deref, L: Deref> CoinSelectionSource for Wallet<W, L>
+where
+ W::Target: WalletSource,
+ L::Target: Logger
+{
fn select_confirmed_utxos(
&self, claim_id: ClaimId, must_spend: &[Input], must_pay_to: &[TxOut],
target_feerate_sat_per_1000_weight: u32,
((BASE_TX_SIZE + total_output_size) * WITNESS_SCALE_FACTOR as u64);
let target_amount_sat = must_pay_to.iter().map(|output| output.value).sum();
let do_coin_selection = |force_conflicting_utxo_spend: bool, tolerate_high_network_feerates: bool| {
+ log_debug!(self.logger, "Attempting coin selection targeting {} sat/kW (force_conflicting_utxo_spend = {}, tolerate_high_network_feerates = {})",
+ target_feerate_sat_per_1000_weight, force_conflicting_utxo_spend, tolerate_high_network_feerates);
self.select_confirmed_utxos_internal(
&utxos, claim_id, force_conflicting_utxo_spend, tolerate_high_network_feerates,
target_feerate_sat_per_1000_weight, preexisting_tx_weight, target_amount_sat,
// match, but we still need to have at least one output in the transaction for it to be
// considered standard. We choose to go with an empty OP_RETURN as it is the cheapest
// way to include a dummy output.
+ log_debug!(self.logger, "Including dummy OP_RETURN output since an output is needed and a change output was not provided");
tx.output.push(TxOut {
value: 0,
script_pubkey: Script::new_op_return(&[]),
FEERATE_FLOOR_SATS_PER_KW,
);
+ log_debug!(self.logger, "Peforming coin selection for anchor transaction targeting {} sat/kW",
+ anchor_target_feerate_sat_per_1000_weight);
let must_spend = vec![Input {
outpoint: anchor_descriptor.outpoint,
previous_utxo: anchor_descriptor.previous_utxo(),
ANCHOR_INPUT_WITNESS_WEIGHT + EMPTY_SCRIPT_SIG_WEIGHT;
self.process_coin_selection(&mut anchor_tx, coin_selection);
+ let anchor_txid = anchor_tx.txid();
debug_assert_eq!(anchor_tx.output.len(), 1);
#[cfg(debug_assertions)]
let unsigned_tx_weight = anchor_tx.weight() as u64 - (anchor_tx.input.len() as u64 * EMPTY_SCRIPT_SIG_WEIGHT);
+ log_debug!(self.logger, "Signing anchor transaction {}", anchor_txid);
self.utxo_source.sign_tx(&mut anchor_tx)?;
let signer = anchor_descriptor.derive_channel_signer(&self.signer_provider);
let anchor_sig = signer.sign_holder_anchor_input(&anchor_tx, 0, &self.secp)?;
#[cfg(debug_assertions)] {
let signed_tx_weight = anchor_tx.weight() as u64;
let expected_signed_tx_weight = unsigned_tx_weight + total_satisfaction_weight;
- // Our estimate should be within a 1% error margin of the actual weight.
- assert!(expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
+ // Our estimate should be within a 1% error margin of the actual weight and we should
+ // never underestimate.
+ assert!(expected_signed_tx_weight >= signed_tx_weight &&
+ expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
}
+ log_info!(self.logger, "Broadcasting anchor transaction {} to bump channel close with txid {}",
+ anchor_txid, commitment_tx.txid());
self.broadcaster.broadcast_transactions(&[&commitment_tx, &anchor_tx]);
Ok(())
}
htlc_tx.output.push(htlc_output);
}
+ log_debug!(self.logger, "Peforming coin selection for HTLC transaction targeting {} sat/kW",
+ target_feerate_sat_per_1000_weight);
let coin_selection = self.utxo_source.select_confirmed_utxos(
claim_id, &must_spend, &htlc_tx.output, target_feerate_sat_per_1000_weight,
)?;
#[cfg(debug_assertions)]
let unsigned_tx_weight = htlc_tx.weight() as u64 - (htlc_tx.input.len() as u64 * EMPTY_SCRIPT_SIG_WEIGHT);
+ log_debug!(self.logger, "Signing HTLC transaction {}", htlc_tx.txid());
self.utxo_source.sign_tx(&mut htlc_tx)?;
let mut signers = BTreeMap::new();
for (idx, htlc_descriptor) in htlc_descriptors.iter().enumerate() {
#[cfg(debug_assertions)] {
let signed_tx_weight = htlc_tx.weight() as u64;
let expected_signed_tx_weight = unsigned_tx_weight + total_satisfaction_weight;
- // Our estimate should be within a 1% error margin of the actual weight.
- assert!(expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
+ // Our estimate should be within a 1% error margin of the actual weight and we should
+ // never underestimate.
+ assert!(expected_signed_tx_weight >= signed_tx_weight &&
+ expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
}
+ log_info!(self.logger, "Broadcasting {}", log_tx!(htlc_tx));
self.broadcaster.broadcast_transactions(&[&htlc_tx]);
Ok(())
}
claim_id, package_target_feerate_sat_per_1000_weight, commitment_tx,
commitment_tx_fee_satoshis, anchor_descriptor, ..
} => {
+ log_info!(self.logger, "Handling channel close bump (claim_id = {}, commitment_txid = {})",
+ log_bytes!(claim_id.0), commitment_tx.txid());
if let Err(_) = self.handle_channel_close(
*claim_id, *package_target_feerate_sat_per_1000_weight, commitment_tx,
*commitment_tx_fee_satoshis, anchor_descriptor,
BumpTransactionEvent::HTLCResolution {
claim_id, target_feerate_sat_per_1000_weight, htlc_descriptors, tx_lock_time,
} => {
+ log_info!(self.logger, "Handling HTLC bump (claim_id = {}, htlcs_to_claim = {})",
+ log_bytes!(claim_id.0), log_iter!(htlc_descriptors.iter().map(|d| d.outpoint())));
if let Err(_) = self.handle_htlc_resolution(
*claim_id, *target_feerate_sat_per_1000_weight, htlc_descriptors, *tx_lock_time,
) {
projects / rust-lightning / commitdiff