Function signpsbt_done

plugins/txprepare.c:183–226

Called after lightningd has signed the inputs. */

/* Called after lightningd has signed the inputs. */
static struct command_result *signpsbt_done(struct command *cmd,
					    const char *method,
					    const char *buf,
					    const jsmntok_t *result,
					    struct unreleased_tx *utx)
{
	struct out_req *req;
	const jsmntok_t *psbttok = json_get_member(buf, result, "signed_psbt");
	struct bitcoin_txid txid;

	tal_free(utx->psbt);
	utx->psbt = json_tok_psbt(utx, buf, psbttok);
	/* Replace with signed tx. */
	tal_free(utx->tx);

	/* The txid from the signed PSBT should match our expectation. */
	psbt_txid(NULL, utx->psbt, &txid, NULL);
	if (!bitcoin_txid_eq(&txid, &utx->txid)) {
		return command_fail(cmd, LIGHTNINGD,
				    "Signed tx changed txid? Had '%s' now '%s'",
				    fmt_bitcoin_txid(tmpctx, &utx->txid),
				    fmt_bitcoin_txid(tmpctx, &txid));
	}

	/* Finalize the signed PSBT and extract the fully signed tx,
	 * so that utx->tx contains witness data for the response. */
	if (!psbt_finalize(utx->psbt))
		return command_fail(cmd, LIGHTNINGD,
				    "Signed PSBT not finalizeable: %s",
				    fmt_wally_psbt(tmpctx, utx->psbt));

	utx->tx = psbt_final_tx(utx, utx->psbt);
	if (!utx->tx)
		return command_fail(cmd, LIGHTNINGD,
				    "Could not extract final tx: %s",
				    fmt_wally_psbt(tmpctx, utx->psbt));

	req = jsonrpc_request_start(cmd, "sendpsbt",
				    sendpsbt_done,
				    txprepare_forward_error,
				    utx);
	json_add_psbt(req->js, "psbt", utx->psbt);
	return send_outreq(req);
}

static struct command_result *finish_txprepare(struct command *cmd,
					       struct txprepare *txp)