Function htlc_set_add_

lightningd/htlc_set.c:136–268

}

void htlc_set_add_(struct lightningd *ld,
		   struct logger *log,
		   struct amount_msat msat,
		   struct amount_msat total_msat,
		   const struct amount_msat *invoice_msat_override,
		   const struct sha256 *payment_hash,
		   const struct secret *payment_secret,
		   void (*fail)(void *, const u8 *),
		   void (*succeeded)(void *, const struct preimage *),
		   void *arg)
{
	struct incoming_payment *inpay;
	struct htlc_set *set;
	const struct invoice_details *details;
	const char *err;

	/* BOLT #4:
	 * The final node:
	 *   - MUST fail the HTLC if dictated by Requirements under
	 *     [Failure Messages](#failure-messages)
	 *     - Note: "amount paid" specified there is the `total_msat` field.
	 */
	details = invoice_check_payment(tmpctx, ld, payment_hash, total_msat,
					invoice_msat_override, payment_secret,
					&err);
	if (!details) {
		log_debug(log, "payment failed: %s", err);
		fail(arg, take(failmsg_incorrect_or_unknown(NULL, ld, msat)));
		return;
	}

	/* If we insist on a payment secret, it must always have it */
	if (feature_is_set(details->features, COMPULSORY_FEATURE(OPT_PAYMENT_SECRET))
	    && !payment_secret) {
		log_debug(log,
			  "Missing payment_secret, but required for %s",
			  fmt_sha256(tmpctx, payment_hash));
		fail(arg, take(failmsg_incorrect_or_unknown(NULL, ld, msat)));
		return;
	}

	/* BOLT #4:
	 *  - otherwise, if it supports `basic_mpp`:
	 *    - MUST add it to the HTLC set corresponding to that `payment_hash`.
	 */
	inpay = new_inpay(arg, log, msat, fail, succeeded, arg);
	set = htlc_set_map_get(ld->htlc_sets, payment_hash);
	if (!set)
		set = new_htlc_set(ld, inpay, payment_hash, total_msat);
	else {
		/* BOLT #4:
		 *
		 * otherwise, if it supports `basic_mpp`:
		 * ...
		 *  - otherwise, if the total `amt_to_forward` of this HTLC set is
		 *    less than `total_msat`:
		 * ...
		 *     - MUST require `payment_secret` for all HTLCs in the set.