Function payment_listpeerchannels_balance_sum

plugins/libplugin-pay.c:938–973

* Compute the total sum of balances. Limits the maximum size we can * pay as a preflight test. Returns `false` on errors, otherwise * `sum` contains the sum of all channel balances.*/

 * pay as a preflight test.  Returns `false` on errors, otherwise
 * `sum` contains the sum of all channel balances.*/
static bool payment_listpeerchannels_balance_sum(struct payment *p,
						 const char *buf,
						 const jsmntok_t *toks,
						 struct amount_msat *sum)
{
	*sum = AMOUNT_MSAT(0);
	const jsmntok_t *channels, *channel;
	struct amount_msat spendable;
	bool connected;
	size_t i;
	const char *err;

	channels = json_get_member(buf, toks, "channels");

	json_for_each_arr(i, channel, channels)
	{
		err = json_scan(tmpctx, buf, channel,
				"{spendable_msat?:%,peer_connected:%}",
				JSON_SCAN(json_to_msat, &spendable),
				JSON_SCAN(json_to_bool, &connected));
		if (err) {
			paymod_log(p, LOG_UNUSUAL,
				   "Bad listpeerchannels.channels %zu: %s", i,
				   err);
			return false;
		}

		if (!amount_msat_accumulate(sum, spendable)) {
			paymod_log(
			    p, LOG_BROKEN,
			    "Integer sum overflow summing spendable amounts.");
			return false;
		}
	}
	return true;
}

static struct command_result *
payment_listpeerchannels_success(struct command *cmd,