Function send_commit

channeld/channeld.c:1223–1405

}

static void send_commit(struct peer *peer)
{
	u8 *msg;
	const struct htlc **changed_htlcs;
	struct bitcoin_signature commit_sig, *htlc_sigs;
	struct bitcoin_tx **txs;
	const u8 *funding_wscript;
	const struct htlc **htlc_map;
	struct wally_tx_output *direct_outputs[NUM_SIDES];
	struct penalty_base *pbase;
	u32 our_blockheight;
	u32 feerate_target;

#if DEVELOPER
	if (peer->dev_disable_commit && !*peer->dev_disable_commit) {
		peer->commit_timer = NULL;
		return;
	}
#endif

	/* FIXME: Document this requirement in BOLT 2! */
	/* We can't send two commits in a row. */
	if (peer->revocations_received != peer->next_index[REMOTE] - 1) {
		assert(peer->revocations_received
		       == peer->next_index[REMOTE] - 2);
		peer->commit_timer_attempts++;
		/* Only report this in extreme cases */
		if (peer->commit_timer_attempts % 100 == 0)
			status_debug("Can't send commit:"
				     " waiting for revoke_and_ack with %"
				     PRIu64" attempts",
				     peer->commit_timer_attempts);
		/* Mark this as done and try again. */
		peer->commit_timer = NULL;
		start_commit_timer(peer);
		return;
	}

	/* BOLT #2:
	 *
	 *   - if no HTLCs remain in either commitment transaction (including dust HTLCs)
	 *     and neither side has a pending `revoke_and_ack` to send:
	 *	- MUST NOT send any `update` message after that point.
	 */
	if (peer->shutdown_sent[LOCAL] && !num_channel_htlcs(peer->channel)) {
		status_debug("Can't send commit: final shutdown phase");

		peer->commit_timer = NULL;
		return;
	}

	/* If we wanted to update fees, do it now. */
	if (want_fee_update(peer, &feerate_target)) {
		/* FIXME: We occasionally desynchronize with LND here, so
		 * don't stress things by having more than one feerate change
		 * in-flight! */
		if (feerate_changes_done(peer->channel->fee_states, false)) {
			/* BOLT-919 #2: