use alloc::collections::BTreeMap;
use core::ops::Deref;
-use crate::chain::chaininterface::{BroadcasterInterface, compute_feerate_sat_per_1000_weight, fee_for_weight, FEERATE_FLOOR_SATS_PER_KW};
+use crate::chain::chaininterface::{BroadcasterInterface, fee_for_weight};
use crate::chain::ClaimId;
use crate::io_extras::sink;
use crate::ln::channel::ANCHOR_OUTPUT_VALUE_SATOSHI;
use crate::ln::features::ChannelTypeFeatures;
use crate::ln::PaymentPreimage;
use crate::prelude::*;
-use crate::sign::{ChannelSigner, EcdsaChannelSigner, SignerProvider, WriteableEcdsaChannelSigner};
+use crate::sign::{EcdsaChannelSigner, SignerProvider, WriteableEcdsaChannelSigner};
use crate::sync::Mutex;
use crate::util::logger::Logger;
pub transaction_parameters: ChannelTransactionParameters,
}
+impl_writeable_tlv_based!(ChannelDerivationParameters, {
+ (0, value_satoshis, required),
+ (2, keys_id, required),
+ (4, transaction_parameters, required),
+});
+
/// A descriptor used to sign for a commitment transaction's anchor output.
#[derive(Clone, Debug, PartialEq, Eq)]
pub struct AnchorDescriptor {
pub counterparty_sig: Signature
}
+impl_writeable_tlv_based!(HTLCDescriptor, {
+ (0, channel_derivation_parameters, required),
+ (2, commitment_txid, required),
+ (4, per_commitment_number, required),
+ (6, per_commitment_point, required),
+ (8, htlc, required),
+ (10, preimage, option),
+ (12, counterparty_sig, required),
+});
+
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.
/// An input that must be included in a transaction when performing coin selection through
/// [`CoinSelectionSource::select_confirmed_utxos`]. It is guaranteed to be a SegWit input, so it
/// must have an empty [`TxIn::script_sig`] when spent.
+#[derive(Clone, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
pub struct Input {
/// The unique identifier of the input.
pub outpoint: OutPoint,
/// An unspent transaction output that is available to spend resulting from a successful
/// [`CoinSelection`] attempt.
-#[derive(Clone, Debug)]
+#[derive(Clone, Debug, Hash, PartialOrd, Ord, PartialEq, Eq)]
pub struct Utxo {
/// The unique identifier of the output.
pub outpoint: OutPoint,
/// The result of a successful coin selection attempt for a transaction requiring additional UTXOs
/// to cover its fees.
+#[derive(Clone, Debug)]
pub struct CoinSelection {
/// The set of UTXOs (with at least 1 confirmation) to spend and use within a transaction
/// requiring additional fees.
/// which UTXOs to double spend is left to the implementation, but it must strive to keep the
/// set of other claims being double spent to a minimum.
fn select_confirmed_utxos(
- &self, claim_id: ClaimId, must_spend: &[Input], must_pay_to: &[TxOut],
+ &self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &[TxOut],
target_feerate_sat_per_1000_weight: u32,
) -> Result<CoinSelection, ()>;
/// Signs and provides the full witness for all inputs within the transaction known to the
fn select_confirmed_utxos_internal(
&self, utxos: &[Utxo], claim_id: ClaimId, force_conflicting_utxo_spend: bool,
tolerate_high_network_feerates: bool, target_feerate_sat_per_1000_weight: u32,
- preexisting_tx_weight: u64, target_amount_sat: u64,
+ preexisting_tx_weight: u64, input_amount_sat: u64, target_amount_sat: u64,
) -> Result<CoinSelection, ()> {
let mut locked_utxos = self.locked_utxos.lock().unwrap();
let mut eligible_utxos = utxos.iter().filter_map(|utxo| {
}).collect::<Vec<_>>();
eligible_utxos.sort_unstable_by_key(|(utxo, _)| utxo.output.value);
- let mut selected_amount = 0;
+ let mut selected_amount = input_amount_sat;
let mut total_fees = fee_for_weight(target_feerate_sat_per_1000_weight, preexisting_tx_weight);
let mut selected_utxos = Vec::new();
for (utxo, fee_to_spend_utxo) in eligible_utxos {
L::Target: Logger
{
fn select_confirmed_utxos(
- &self, claim_id: ClaimId, must_spend: &[Input], must_pay_to: &[TxOut],
+ &self, claim_id: ClaimId, must_spend: Vec<Input>, must_pay_to: &[TxOut],
target_feerate_sat_per_1000_weight: u32,
) -> Result<CoinSelection, ()> {
let utxos = self.source.list_confirmed_utxos()?;
let preexisting_tx_weight = 2 /* segwit marker & flag */ + total_input_weight +
((BASE_TX_SIZE + total_output_size) * WITNESS_SCALE_FACTOR as u64);
+ let input_amount_sat: u64 = must_spend.iter().map(|input| input.previous_utxo.value).sum();
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,
+ target_feerate_sat_per_1000_weight, preexisting_tx_weight, input_amount_sat, target_amount_sat,
)
};
do_coin_selection(false, false)
commitment_tx: &Transaction, commitment_tx_fee_sat: u64, anchor_descriptor: &AnchorDescriptor,
) -> Result<(), ()> {
// Our commitment transaction already has fees allocated to it, so we should take them into
- // account. We compute its feerate and subtract it from the package target, using the result
- // as the target feerate for our anchor transaction. Unfortunately, this results in users
- // overpaying by a small margin since we don't yet know the anchor transaction size, and
- // avoiding the small overpayment only makes our API even more complex.
- let commitment_tx_sat_per_1000_weight: u32 = compute_feerate_sat_per_1000_weight(
- commitment_tx_fee_sat, commitment_tx.weight() as u64,
- );
- let anchor_target_feerate_sat_per_1000_weight = core::cmp::max(
- package_target_feerate_sat_per_1000_weight - commitment_tx_sat_per_1000_weight,
- 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);
+ // account. We do so by pretending the commitment tranasction's fee and weight are part of
+ // the anchor input.
+ let mut anchor_utxo = anchor_descriptor.previous_utxo();
+ anchor_utxo.value += commitment_tx_fee_sat;
let must_spend = vec![Input {
outpoint: anchor_descriptor.outpoint,
- previous_utxo: anchor_descriptor.previous_utxo(),
+ previous_utxo: anchor_utxo,
satisfaction_weight: commitment_tx.weight() as u64 + ANCHOR_INPUT_WITNESS_WEIGHT + EMPTY_SCRIPT_SIG_WEIGHT,
}];
+ #[cfg(debug_assertions)]
+ let must_spend_amount = must_spend.iter().map(|input| input.previous_utxo.value).sum::<u64>();
+
+ log_debug!(self.logger, "Peforming coin selection for commitment package (commitment and anchor transaction) targeting {} sat/kW",
+ package_target_feerate_sat_per_1000_weight);
let coin_selection = self.utxo_source.select_confirmed_utxos(
- claim_id, &must_spend, &[], anchor_target_feerate_sat_per_1000_weight,
+ claim_id, must_spend, &[], package_target_feerate_sat_per_1000_weight,
)?;
let mut anchor_tx = Transaction {
input: vec![anchor_descriptor.unsigned_tx_input()],
output: vec![],
};
+
#[cfg(debug_assertions)]
- let total_satisfaction_weight =
- coin_selection.confirmed_utxos.iter().map(|utxo| utxo.satisfaction_weight).sum::<u64>() +
- ANCHOR_INPUT_WITNESS_WEIGHT + EMPTY_SCRIPT_SIG_WEIGHT;
+ let total_satisfaction_weight = ANCHOR_INPUT_WITNESS_WEIGHT + EMPTY_SCRIPT_SIG_WEIGHT +
+ coin_selection.confirmed_utxos.iter().map(|utxo| utxo.satisfaction_weight).sum::<u64>();
+ #[cfg(debug_assertions)]
+ let total_input_amount = must_spend_amount +
+ coin_selection.confirmed_utxos.iter().map(|utxo| utxo.output.value).sum::<u64>();
self.process_coin_selection(&mut anchor_tx, coin_selection);
let anchor_txid = anchor_tx.txid();
// never underestimate.
assert!(expected_signed_tx_weight >= signed_tx_weight &&
expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
+
+ let expected_package_fee = fee_for_weight(package_target_feerate_sat_per_1000_weight,
+ signed_tx_weight + commitment_tx.weight() as u64);
+ let package_fee = total_input_amount -
+ anchor_tx.output.iter().map(|output| output.value).sum::<u64>();
+ // Our fee should be within a 5% error margin of the expected fee based on the
+ // feerate and transaction weight and we should never pay less than required.
+ let fee_error_margin = expected_package_fee * 5 / 100;
+ assert!(package_fee >= expected_package_fee &&
+ package_fee - fee_error_margin <= expected_package_fee);
}
log_info!(self.logger, "Broadcasting anchor transaction {} to bump channel close with txid {}",
log_debug!(self.logger, "Peforming coin selection for HTLC transaction targeting {} sat/kW",
target_feerate_sat_per_1000_weight);
+
+ #[cfg(debug_assertions)]
+ let must_spend_satisfaction_weight =
+ must_spend.iter().map(|input| input.satisfaction_weight).sum::<u64>();
+ #[cfg(debug_assertions)]
+ let must_spend_amount = must_spend.iter().map(|input| input.previous_utxo.value).sum::<u64>();
+
let coin_selection = self.utxo_source.select_confirmed_utxos(
- claim_id, &must_spend, &htlc_tx.output, target_feerate_sat_per_1000_weight,
+ claim_id, must_spend, &htlc_tx.output, target_feerate_sat_per_1000_weight,
)?;
+
+ #[cfg(debug_assertions)]
+ let total_satisfaction_weight = must_spend_satisfaction_weight +
+ coin_selection.confirmed_utxos.iter().map(|utxo| utxo.satisfaction_weight).sum::<u64>();
#[cfg(debug_assertions)]
- let total_satisfaction_weight =
- coin_selection.confirmed_utxos.iter().map(|utxo| utxo.satisfaction_weight).sum::<u64>() +
- must_spend.iter().map(|input| input.satisfaction_weight).sum::<u64>();
+ let total_input_amount = must_spend_amount +
+ coin_selection.confirmed_utxos.iter().map(|utxo| utxo.output.value).sum::<u64>();
+
self.process_coin_selection(&mut htlc_tx, coin_selection);
#[cfg(debug_assertions)]
// never underestimate.
assert!(expected_signed_tx_weight >= signed_tx_weight &&
expected_signed_tx_weight - (expected_signed_tx_weight / 100) <= signed_tx_weight);
+
+ let expected_signed_tx_fee = fee_for_weight(target_feerate_sat_per_1000_weight, signed_tx_weight);
+ let signed_tx_fee = total_input_amount -
+ htlc_tx.output.iter().map(|output| output.value).sum::<u64>();
+ // Our fee should be within a 5% error margin of the expected fee based on the
+ // feerate and transaction weight and we should never pay less than required.
+ let fee_error_margin = expected_signed_tx_fee * 5 / 100;
+ assert!(signed_tx_fee >= expected_signed_tx_fee &&
+ signed_tx_fee - fee_error_margin <= expected_signed_tx_fee);
}
log_info!(self.logger, "Broadcasting {}", log_tx!(htlc_tx));
projects / rust-lightning / blobdiff