+
+ let htlc_resolved = self.htlcs_resolved_on_chain.iter()
+ .find(|v| if v.commitment_tx_output_idx == Some(htlc_commitment_tx_output_idx) {
+ debug_assert!(htlc_spend_txid_opt.is_none());
+ htlc_spend_txid_opt = v.resolving_txid.as_ref();
+ debug_assert!(htlc_spend_tx_opt.is_none());
+ htlc_spend_tx_opt = v.resolving_tx.as_ref();
+ true
+ } else { false });
+
+ let htlc_commitment_outpoint = BitcoinOutPoint::new(confirmed_txid.unwrap(), htlc_commitment_tx_output_idx);
+ let htlc_output_to_spend =
+ if let Some(txid) = htlc_spend_txid_opt {
+ // Because HTLC transactions either only have 1 input and 1 output (pre-anchors) or
+ // are signed with SIGHASH_SINGLE|ANYONECANPAY under BIP-0143 (post-anchors), we can
+ // locate the correct output by ensuring its adjacent input spends the HTLC output
+ // in the commitment.
+ if let Some(ref tx) = htlc_spend_tx_opt {
+ let htlc_input_idx_opt = tx.input.iter().enumerate()
+ .find(|(_, input)| input.previous_output == htlc_commitment_outpoint)
+ .map(|(idx, _)| idx as u32);
+ debug_assert!(htlc_input_idx_opt.is_some());
+ BitcoinOutPoint::new(*txid, htlc_input_idx_opt.unwrap_or(0))
+ } else {
+ debug_assert!(!self.onchain_tx_handler.channel_type_features().supports_anchors_zero_fee_htlc_tx());
+ BitcoinOutPoint::new(*txid, 0)
+ }
+ } else {
+ htlc_commitment_outpoint
+ };
+ let htlc_output_spend_pending = self.onchain_tx_handler.is_output_spend_pending(&htlc_output_to_spend);
+