}
}
- fn broadcast_latest_holder_commitment_txn<B: Deref, L: Deref>(&mut self, broadcaster: &B, logger: &WithChannelMonitor<L>)
- where B::Target: BroadcasterInterface,
- L::Target: Logger,
- {
- let commit_txs = self.get_latest_holder_commitment_txn(logger);
- let mut txs = vec![];
- for tx in commit_txs.iter() {
- log_info!(logger, "Broadcasting local {}", log_tx!(tx));
- txs.push(tx);
- }
- broadcaster.broadcast_transactions(&txs);
+ fn generate_claimable_outpoints_and_watch_outputs(&mut self) -> (Vec<PackageTemplate>, Vec<TransactionOutputs>) {
+ let funding_outp = HolderFundingOutput::build(
+ self.funding_redeemscript.clone(),
+ self.channel_value_satoshis,
+ self.onchain_tx_handler.channel_type_features().clone()
+ );
+ let commitment_package = PackageTemplate::build_package(
+ self.funding_info.0.txid.clone(), self.funding_info.0.index as u32,
+ PackageSolvingData::HolderFundingOutput(funding_outp),
+ self.best_block.height(), self.best_block.height()
+ );
+ let mut claimable_outpoints = vec![commitment_package];
self.pending_monitor_events.push(MonitorEvent::HolderForceClosed(self.funding_info.0));
+ // Although we aren't signing the transaction directly here, the transaction will be signed
+ // in the claim that is queued to OnchainTxHandler. We set holder_tx_signed here to reject
+ // new channel updates.
+ self.holder_tx_signed = true;
+ let mut watch_outputs = Vec::new();
+ // We can't broadcast our HTLC transactions while the commitment transaction is
+ // unconfirmed. We'll delay doing so until we detect the confirmed commitment in
+ // `transactions_confirmed`.
+ if !self.onchain_tx_handler.channel_type_features().supports_anchors_zero_fee_htlc_tx() {
+ // Because we're broadcasting a commitment transaction, we should construct the package
+ // assuming it gets confirmed in the next block. Sadly, we have code which considers
+ // "not yet confirmed" things as discardable, so we cannot do that here.
+ let (mut new_outpoints, _) = self.get_broadcasted_holder_claims(
+ &self.current_holder_commitment_tx, self.best_block.height()
+ );
+ let unsigned_commitment_tx = self.onchain_tx_handler.get_unsigned_holder_commitment_tx();
+ let new_outputs = self.get_broadcasted_holder_watch_outputs(
+ &self.current_holder_commitment_tx, &unsigned_commitment_tx
+ );
+ if !new_outputs.is_empty() {
+ watch_outputs.push((self.current_holder_commitment_tx.txid.clone(), new_outputs));
+ }
+ claimable_outpoints.append(&mut new_outpoints);
+ }
+ (claimable_outpoints, watch_outputs)
+ }
+
+ pub(crate) fn queue_latest_holder_commitment_txn_for_broadcast<B: Deref, F: Deref, L: Deref>(
+ &mut self, broadcaster: &B, fee_estimator: &LowerBoundedFeeEstimator<F>, logger: &WithChannelMonitor<L>
+ )
+ where
+ B::Target: BroadcasterInterface,
+ F::Target: FeeEstimator,
+ L::Target: Logger,
+ {
+ let (claimable_outpoints, _) = self.generate_claimable_outpoints_and_watch_outputs();
+ self.onchain_tx_handler.update_claims_view_from_requests(
+ claimable_outpoints, self.best_block.height(), self.best_block.height(), broadcaster,
+ fee_estimator, logger
+ );
}
fn update_monitor<B: Deref, F: Deref, L: Deref>(
log_trace!(logger, "Avoiding commitment broadcast, already detected confirmed spend onchain");
continue;
}
- self.broadcast_latest_holder_commitment_txn(broadcaster, logger);
- // If the channel supports anchor outputs, we'll need to emit an external
- // event to be consumed such that a child transaction is broadcast with a
- // high enough feerate for the parent commitment transaction to confirm.
- if self.onchain_tx_handler.channel_type_features().supports_anchors_zero_fee_htlc_tx() {
- let funding_output = HolderFundingOutput::build(
- self.funding_redeemscript.clone(), self.channel_value_satoshis,
- self.onchain_tx_handler.channel_type_features().clone(),
- );
- let best_block_height = self.best_block.height();
- let commitment_package = PackageTemplate::build_package(
- self.funding_info.0.txid.clone(), self.funding_info.0.index as u32,
- PackageSolvingData::HolderFundingOutput(funding_output),
- best_block_height, best_block_height
- );
- self.onchain_tx_handler.update_claims_view_from_requests(
- vec![commitment_package], best_block_height, best_block_height,
- broadcaster, &bounded_fee_estimator, logger,
- );
- }
+ self.queue_latest_holder_commitment_txn_for_broadcast(broadcaster, &bounded_fee_estimator, logger);
} else if !self.holder_tx_signed {
log_error!(logger, "WARNING: You have a potentially-unsafe holder commitment transaction available to broadcast");
log_error!(logger, " in channel monitor for channel {}!", &self.funding_info.0.to_channel_id());
}
}
+ /// Cancels any existing pending claims for a commitment that previously confirmed and has now
+ /// been replaced by another.
+ pub fn cancel_prev_commitment_claims<L: Deref>(
+ &mut self, logger: &L, confirmed_commitment_txid: &Txid
+ ) where L::Target: Logger {
+ for (counterparty_commitment_txid, _) in &self.counterparty_commitment_txn_on_chain {
+ // Cancel any pending claims for counterparty commitments we've seen confirm.
+ if counterparty_commitment_txid == confirmed_commitment_txid {
+ continue;
+ }
+ for (htlc, _) in self.counterparty_claimable_outpoints.get(counterparty_commitment_txid).unwrap_or(&vec![]) {
+ log_trace!(logger, "Canceling claims for previously confirmed counterparty commitment {}",
+ counterparty_commitment_txid);
+ let mut outpoint = BitcoinOutPoint { txid: *counterparty_commitment_txid, vout: 0 };
+ if let Some(vout) = htlc.transaction_output_index {
+ outpoint.vout = vout;
+ self.onchain_tx_handler.abandon_claim(&outpoint);
+ }
+ }
+ }
+ if self.holder_tx_signed {
+ // If we've signed, we may have broadcast either commitment (prev or current), and
+ // attempted to claim from it immediately without waiting for a confirmation.
+ if self.current_holder_commitment_tx.txid != *confirmed_commitment_txid {
+ log_trace!(logger, "Canceling claims for previously broadcast holder commitment {}",
+ self.current_holder_commitment_tx.txid);
+ let mut outpoint = BitcoinOutPoint { txid: self.current_holder_commitment_tx.txid, vout: 0 };
+ for (htlc, _, _) in &self.current_holder_commitment_tx.htlc_outputs {
+ if let Some(vout) = htlc.transaction_output_index {
+ outpoint.vout = vout;
+ self.onchain_tx_handler.abandon_claim(&outpoint);
+ }
+ }
+ }
+ if let Some(prev_holder_commitment_tx) = &self.prev_holder_signed_commitment_tx {
+ if prev_holder_commitment_tx.txid != *confirmed_commitment_txid {
+ log_trace!(logger, "Canceling claims for previously broadcast holder commitment {}",
+ prev_holder_commitment_tx.txid);
+ let mut outpoint = BitcoinOutPoint { txid: prev_holder_commitment_tx.txid, vout: 0 };
+ for (htlc, _, _) in &prev_holder_commitment_tx.htlc_outputs {
+ if let Some(vout) = htlc.transaction_output_index {
+ outpoint.vout = vout;
+ self.onchain_tx_handler.abandon_claim(&outpoint);
+ }
+ }
+ }
+ }
+ } else {
+ // No previous claim.
+ }
+ }
+
fn get_latest_holder_commitment_txn<L: Deref>(
&mut self, logger: &WithChannelMonitor<L>,
) -> Vec<Transaction> where L::Target: Logger {
commitment_tx_to_counterparty_output,
},
});
+ // Now that we've detected a confirmed commitment transaction, attempt to cancel
+ // pending claims for any commitments that were previously confirmed such that
+ // we don't continue claiming inputs that no longer exist.
+ self.cancel_prev_commitment_claims(&logger, &txid);
}
}
if tx.input.len() >= 1 {
let should_broadcast = self.should_broadcast_holder_commitment_txn(logger);
if should_broadcast {
- let funding_outp = HolderFundingOutput::build(self.funding_redeemscript.clone(), self.channel_value_satoshis, self.onchain_tx_handler.channel_type_features().clone());
- let commitment_package = PackageTemplate::build_package(self.funding_info.0.txid.clone(), self.funding_info.0.index as u32, PackageSolvingData::HolderFundingOutput(funding_outp), self.best_block.height(), self.best_block.height());
- claimable_outpoints.push(commitment_package);
- self.pending_monitor_events.push(MonitorEvent::HolderForceClosed(self.funding_info.0));
- // Although we aren't signing the transaction directly here, the transaction will be signed
- // in the claim that is queued to OnchainTxHandler. We set holder_tx_signed here to reject
- // new channel updates.
- self.holder_tx_signed = true;
- // We can't broadcast our HTLC transactions while the commitment transaction is
- // unconfirmed. We'll delay doing so until we detect the confirmed commitment in
- // `transactions_confirmed`.
- if !self.onchain_tx_handler.channel_type_features().supports_anchors_zero_fee_htlc_tx() {
- // Because we're broadcasting a commitment transaction, we should construct the package
- // assuming it gets confirmed in the next block. Sadly, we have code which considers
- // "not yet confirmed" things as discardable, so we cannot do that here.
- let (mut new_outpoints, _) = self.get_broadcasted_holder_claims(&self.current_holder_commitment_tx, self.best_block.height());
- let unsigned_commitment_tx = self.onchain_tx_handler.get_unsigned_holder_commitment_tx();
- let new_outputs = self.get_broadcasted_holder_watch_outputs(&self.current_holder_commitment_tx, &unsigned_commitment_tx);
- if !new_outputs.is_empty() {
- watch_outputs.push((self.current_holder_commitment_tx.txid.clone(), new_outputs));
- }
- claimable_outpoints.append(&mut new_outpoints);
- }
+ let (mut new_outpoints, mut new_outputs) = self.generate_claimable_outpoints_and_watch_outputs();
+ claimable_outpoints.append(&mut new_outpoints);
+ watch_outputs.append(&mut new_outputs);
}
// Find which on-chain events have reached their confirmation threshold.
projects / rust-lightning / blobdiff