Function psbt_created

plugins/txprepare.c:278–346

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 *buf,
					   const jsmntok_t *result,
					   struct txprepare *txp)
{
	const jsmntok_t *psbttok;
	struct out_req *req;
	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 (!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, now we can derive its value: excess
	 * in this case will be total value after inputs paid for themselves. */
	if (txp->all_output_idx != -1) {
		if (!resolve_all_output_amount(txp, excess))
			return command_fail(cmd, FUND_CANNOT_AFFORD,
					    "Insufficient funds to make"
					    " 'all' output");

		/* Never produce change if they asked for all */
		excess = AMOUNT_SAT(0);
	}

	/* So, do we need change? */
	txp->change_amount = change_amount(excess, txp->feerate, weight);
	if (amount_sat_eq(txp->change_amount, AMOUNT_SAT(0)))
		return finish_txprepare(cmd, txp);