Function finish_psbt

wallet/reservation.c:335–425

}

static struct command_result *finish_psbt(struct command *cmd,
					  struct utxo **utxos,
					  u32 feerate_per_kw,
					  size_t weight,
					  struct amount_sat excess,
					  u32 reserve,
					  u32 *locktime,
					  struct amount_sat change)
{
	struct json_stream *response;
	struct wally_psbt *psbt;
	ssize_t change_outnum;
	u32 current_height = get_block_height(cmd->ld->topology);

	if (!locktime) {
		locktime = tal(cmd, u32);
		*locktime = default_locktime(cmd->ld->topology);
	}

	psbt = psbt_using_utxos(cmd, cmd->ld->wallet, utxos,
				*locktime, BITCOIN_TX_RBF_SEQUENCE,
				NULL);
	assert(psbt->version == 2);

	/* Should we add a change output?  (Iff it can pay for itself!) */
	change = change_amount(change, feerate_per_kw, weight);
	if (amount_sat_greater(change, AMOUNT_SAT(0))) {
		s64 keyidx;
		u8 *b32script;
		enum addrtype type;

		/* FIXME: P2TR for elements! */
		if (chainparams->is_elements)
			type = ADDR_BECH32;
		else
			type = ADDR_P2TR;

		/* Get a change adddress */
		keyidx = wallet_get_newindex(cmd->ld, type);
		if (keyidx < 0)
			return command_fail(cmd, LIGHTNINGD,
					    "Failed to generate change address."
					    " Keys exhausted.");

		if (chainparams->is_elements) {
			b32script = p2wpkh_for_keyidx(tmpctx, cmd->ld, keyidx);
		} else {
			b32script = p2tr_for_keyidx(tmpctx, cmd->ld, keyidx);
		}
		if (!b32script) {
			return command_fail(cmd, LIGHTNINGD,
					    "Failed to generate change address."
					    " Keys generation failure");
		}

		change_outnum = psbt->num_outputs;
		psbt_append_output(psbt, b32script, change);
		/* Add additional weight of output */