From 633f893ec4d0a0d4398405f30bdd2945b3a0b466 Mon Sep 17 00:00:00 2001
From: Christian Decker <decker.christian@gmail.com>
Date: Wed, 28 Mar 2018 12:03:40 +0200
Subject: [PATCH] gossip: Add function to notify gossipd about an outpoint
 spend

Signed-off-by: Christian Decker <decker.christian@gmail.com>
---
 lightningd/chaintopology.c  | 2 ++
 lightningd/gossip_control.c | 7 +++++++
 lightningd/gossip_control.h | 5 +++++
 3 files changed, 14 insertions(+)

diff --git a/lightningd/chaintopology.c b/lightningd/chaintopology.c
index a58db2353..7618fa0ac 100644
--- a/lightningd/chaintopology.c
+++ b/lightningd/chaintopology.c
@@ -16,6 +16,7 @@
 #include <common/timeout.h>
 #include <common/utils.h>
 #include <inttypes.h>
+#include <lightningd/gossip_control.h>
 
 /* Mutual recursion via timer. */
 static void try_extend_tip(struct chain_topology *topo);
@@ -415,6 +416,7 @@ static void topo_update_spends(struct chain_topology *topo, struct block *b)
 						     b->height, &input->txid,
 						     input->index);
 			if (scid) {
+				gossipd_notify_spend(topo->bitcoind->ld, scid);
 				tal_free(scid);
 			}
 		}
diff --git a/lightningd/gossip_control.c b/lightningd/gossip_control.c
index 1a2958e97..ae6908622 100644
--- a/lightningd/gossip_control.c
+++ b/lightningd/gossip_control.c
@@ -216,6 +216,13 @@ void gossip_init(struct lightningd *ld)
 	subd_send_msg(ld->gossip, msg);
 }
 
+void gossipd_notify_spend(struct lightningd *ld,
+			  const struct short_channel_id *scid)
+{
+	u8 *msg = towire_gossip_outpoint_spent(tmpctx, scid);
+	subd_send_msg(ld->gossip, msg);
+}
+
 static void json_getnodes_reply(struct subd *gossip UNUSED, const u8 *reply,
 				const int *fds UNUSED,
 				struct command *cmd)
diff --git a/lightningd/gossip_control.h b/lightningd/gossip_control.h
index 8a4d6febc..ec0683b37 100644
--- a/lightningd/gossip_control.h
+++ b/lightningd/gossip_control.h
@@ -1,10 +1,15 @@
 #ifndef LIGHTNING_LIGHTNINGD_GOSSIP_CONTROL_H
 #define LIGHTNING_LIGHTNINGD_GOSSIP_CONTROL_H
 #include "config.h"
+#include <bitcoin/short_channel_id.h>
 #include <ccan/short_types/short_types.h>
 #include <stdbool.h>
 
 struct lightningd;
 
 void gossip_init(struct lightningd *ld);
+
+void gossipd_notify_spend(struct lightningd *ld,
+			  const struct short_channel_id *scid);
+
 #endif /* LIGHTNING_LIGHTNINGD_GOSSIP_CONTROL_H */