Function channel_fail_htlc

channeld/full_channel.c:952–992

}

enum channel_remove_err channel_fail_htlc(struct channel *channel,
					  enum side owner, u64 id,
					  struct htlc **htlcp)
{
	struct htlc *htlc;

	htlc = channel_get_htlc(channel, owner, id);
	if (!htlc)
		return CHANNEL_ERR_NO_SUCH_ID;

	/* BOLT #2:
	 *
	 * A receiving node:
	 *   - if the `id` does not correspond to an HTLC in its current
	 *     commitment transaction:
	 *     - MUST send a `warning` and close the connection, or send an
	 *       `error` and fail the channel.
	 */
	if (!htlc_has(htlc, HTLC_FLAG(!htlc_owner(htlc), HTLC_F_COMMITTED))) {
		status_unusual("channel_fail_htlc: %"PRIu64" in state %s",
			     htlc->id, htlc_state_name(htlc->state));
		return CHANNEL_ERR_HTLC_UNCOMMITTED;
	}

	/* FIXME: Technically, they can fail this before we're committed to
	 * it.  This implies a non-linear state machine. */
	if (htlc->state == SENT_ADD_ACK_REVOCATION)
		htlc->state = RCVD_REMOVE_HTLC;
	else if (htlc->state == RCVD_ADD_ACK_REVOCATION)
		htlc->state = SENT_REMOVE_HTLC;
	else {
		status_unusual("channel_fail_htlc: %"PRIu64" in state %s",
			     htlc->id, htlc_state_name(htlc->state));
		return CHANNEL_ERR_HTLC_NOT_IRREVOCABLE;
	}

	dump_htlc(htlc, "FAIL:");
	if (htlcp)
		*htlcp = htlc;
	return CHANNEL_ERR_REMOVE_OK;
}

static void htlc_incstate(struct channel *channel,
			  struct htlc *htlc,