f unwrap ok

Author: TheBlueMatt

lightning/src/ln/channel.rs

@@ -2463,6 +2463,11 @@ impl<Signer: Sign> Channel<Signer> {
 						}
 					},
 					&HTLCUpdateAwaitingACK::ClaimHTLC { ref payment_preimage, htlc_id, .. } => {
+						// If an HTLC claim was previously added to the holding cell (via
+						// `get_update_fulfill_htlc`, then generating the claim message itself must
+						// not fail - any in between attempts to claim the HTLC will have resulted
+						// in it hitting the holding cell again and we cannot change the state of a
+						// holding cell HTLC from fulfill to anything else.
 						let (update_fulfill_msg_option, additional_monitor_update_opt) = self.get_update_fulfill_htlc(htlc_id, *payment_preimage, logger);
 						update_fulfill_htlcs.push(update_fulfill_msg_option.unwrap());
 						if let Some(mut additional_monitor_update) = additional_monitor_update_opt {