Function check_already_failed

lightningd/peer_htlcs.c:1530–1570

We've had a bug report about not failing incoming HTLCs. This does a sanity * check, if we think we've already failed this HTLC */

/* We've had a bug report about not failing incoming HTLCs.  This does a sanity
 * check, if we think we've already failed this HTLC */
static void check_already_failed(const struct channel *channel, struct htlc_out *hout)
{
	htlc_out_check(hout, __func__);

	if (!hout->in)
		return;

	/* in should have been failed/succeeded already */
	if (hout->in->badonion != 0
	    || hout->in->failonion
	    || hout->in->preimage)
		return;

	/* Print out what we think this htlc already has (failed/succeeded) */
	log_broken(channel->log, "HTLC id %"PRIu64" already complete, but ->in not resolved!"
		   " failonion = %s, failmsg = %s, preimage = %s",
		   hout->key.id,
		   hout->failonion ? tal_hex(tmpctx, hout->failonion->contents) : "(null)",
		   hout->failmsg ? tal_hex(tmpctx, hout->failmsg) : "(null)",
		   hout->preimage ? type_to_string(tmpctx, struct preimage, hout->preimage) : "(null)");

	if (hout->preimage) {
		/* Log on both ours and theirs! */
		log_broken(channel->log,
			   "MISSING incoming success for %"PRIu64": succeeding incoming now",
			   hout->key.id);
		log_broken(hout->in->key.channel->log,
			   "MISSED incoming success for %"PRIu64": succeeding now",
			   hout->in->key.id);
		fulfill_htlc(hout->in, hout->preimage);
	} else {
		log_broken(channel->log,
			   "MISSING incoming fail for %"PRIu64": failing incoming now",
			   hout->key.id);
		log_broken(hout->in->key.channel->log,
			   "MISSED incoming fail for %"PRIu64": failing now",
			   hout->in->key.id);
		local_fail_in_htlc(hout->in,
				   take(towire_permanent_channel_failure(NULL)));
	}
}

/* This case searches harder to see if there are any incoming HTLCs */
static void fail_dangling_htlc_in(struct lightningd *ld,