Function psbt_created

plugins/txprepare.c:288–355

fundpsbt/utxopsbt gets a viable PSBT for us. */

/* fundpsbt/utxopsbt gets a viable PSBT for us. */
static struct command_result *psbt_created(struct command *cmd,
					   const char *method,
					   const char *buf,
					   const jsmntok_t *result,
					   struct txprepare *txp)
{
	const jsmntok_t *psbttok;
	struct amount_msat excess_msat;
	struct amount_sat excess;
	u32 weight;

	psbttok = json_get_member(buf, result, "psbt");
	txp->psbt = json_tok_psbt(txp, buf, psbttok);
	if (!txp->psbt)
		return command_fail(cmd, LIGHTNINGD,
				    "Unparsable psbt: '%.*s'",
				    psbttok->end - psbttok->start,
				    buf + psbttok->start);

	if (!psbt_set_version(txp->psbt, 2)) {
		return command_fail(cmd, LIGHTNINGD,
					"Unable to convert PSBT to version 2.");
	}

	if (!json_to_number(buf, json_get_member(buf, result, "feerate_per_kw"),
			    &txp->feerate))
		return command_fail(cmd, LIGHTNINGD,
				    "Unparsable feerate_per_kw: '%.*s'",
				    result->end - result->start,
				    buf + result->start);

	if (!json_to_msat(buf, json_get_member(buf, result, "excess_msat"),
			  &excess_msat)
	    || !amount_msat_to_sat(&excess, excess_msat))
		return command_fail(cmd, LIGHTNINGD,
				    "Unparsable excess_msat: '%.*s'",
				    result->end - result->start,
				    buf + result->start);

	if (!json_to_number(buf, json_get_member(buf, result,
						 "estimated_final_weight"),
			    &weight))
		return command_fail(cmd, LIGHTNINGD,
				    "Unparsable estimated_final_weight: '%.*s'",
				    result->end - result->start,
				    buf + result->start);

	/* If we have an "all" output, we now know its value ("excess_msat") */
	if (txp->all_output_idx != -1) {
		/* Subtract any other outputs they specified! */
		for (size_t i = 0; i < tal_count(txp->outputs); i++) {
			if (i == txp->all_output_idx)
				continue;
			if (!amount_sat_sub(&excess, excess, txp->outputs[i].amount)) {
				return command_fail(cmd, FUND_CANNOT_AFFORD,
						    "Could not afford output %zu", i);
			}
		}