Calculate hold_time for attribution data

We initialise time of creating htlc_out and calculate the time when
this htlc_out is failed.

Key Changes:
 - Add 'send_timestamp' to htlc_out.
 - Calculate hold_time when htlc_out is failed.

Author: adi2011

lightningd/htlc_end.c

@@ -269,7 +269,8 @@ struct htlc_out *new_htlc_out(const tal_t *ctx,
 			      struct amount_msat final_msat,
 			      u64 partid,
 			      u64 groupid,
-			      struct htlc_in *in)
+			      struct htlc_in *in,
+			      struct timeabs send_timestamp)
 {
 	struct htlc_out *hout = tal(ctx, struct htlc_out);
 
@@ -305,6 +306,7 @@ struct htlc_out *new_htlc_out(const tal_t *ctx,
 
 	}
 	hout->in = NULL;
+	hout->send_timestamp = send_timestamp;
 	if (in) {
 		htlc_out_connect_htlc_in(hout, in);
 

lightningd/htlc_end.h

@@ -106,6 +106,8 @@ struct htlc_out {
 
 	/* Timer we use in case they don't add an HTLC in a timely manner. */
 	struct oneshot *timeout;
+
+	struct timeabs send_timestamp;
 };
 
 static inline const struct htlc_key *keyof_htlc_in(const struct htlc_in *in)
@@ -172,7 +174,8 @@ struct htlc_out *new_htlc_out(const tal_t *ctx,
 			      struct amount_msat final_msat,
 			      u64 partid,
 			      u64 groupid,
-			      struct htlc_in *in);
+			      struct htlc_in *in,
+			      struct timeabs send_timestamp);
 
 void connect_htlc_in(struct htlc_in_map *map, struct htlc_in *hin);
 void connect_htlc_out(struct htlc_out_map *map, struct htlc_out *hout);

lightningd/peer_htlcs.c

@@ -313,8 +313,7 @@ static void fail_out_htlc(struct htlc_out *hout, const char *localfail)
 			       hout->failmsg,
 			       localfail);
 	} else if (hout->in) {
-		const struct onionreply *failonion;
-
+		const u32 hold_times = time_between(time_now(), hout->send_timestamp).ts.tv_nsec/1000000;
 		/* If we have an onion, simply copy it. */
 		if (hout->failonion)
 			failonion = hout->failonion;
@@ -731,7 +730,7 @@ const u8 *send_htlc_out(const tal_t *ctx,
 			      payment_hash, onion_routing_packet,
 			      path_key, in == NULL,
 			      final_msat,
-			      partid, groupid, in);
+			      partid, groupid, in, time_now());
 	tal_add_destructor(*houtp, destroy_hout_subd_died);
 
 	/* Give channel 30 seconds to commit this htlc. */
@@ -1074,7 +1073,7 @@ static bool htlc_accepted_hook_deserialize(struct htlc_accepted_hook_payload *re
 					   " Ignoring 'failure_message'.");
 
 			fail_in_htlc(hin, take(new_onionreply(NULL,
-							      failonion)));
+							      failonion, NULL, NULL)));
 			return false;
 		}
 		if (!failmsgtok) {