From: Guus Sliepen <guus@meshlink.io>
Date: Sun, 27 Oct 2019 13:04:29 +0000 (+0100)
Subject: Don't call graph() twice when a new connection replaces an older one.
X-Git-Url: http://git.meshlink.io/?p=meshlink;a=commitdiff_plain;h=fcaa1807cfe424af2498c75b9c6ea6f490dc15ce

Don't call graph() twice when a new connection replaces an older one.

This prevents a node from being considered unreachable for just a small
moment, even though we know it is reachable.
---

diff --git a/src/protocol_auth.c b/src/protocol_auth.c
index 4026c41f..a33c3397 100644
--- a/src/protocol_auth.c
+++ b/src/protocol_auth.c
@@ -436,9 +436,11 @@ bool ack_h(meshlink_handle_t *mesh, connection_t *c, const char *request) {
 				n->connection->outgoing = NULL;
 			}
 
+			/* Remove the edge before terminating the connection, to prevent a graph update. */
+			edge_del(mesh, n->connection->edge);
+			n->connection->edge = NULL;
+
 			terminate_connection(mesh, n->connection, false);
-			/* Run graph algorithm to keep things in sync */
-			graph(mesh);
 		}
 	}
 
diff --git a/test/channels-fork.c b/test/channels-fork.c
index e0db621a..321e5ea6 100644
--- a/test/channels-fork.c
+++ b/test/channels-fork.c
@@ -16,6 +16,7 @@
 #include "../src/meshlink.h"
 
 static struct sync_flag bar_responded;
+static struct sync_flag foo_connected;
 static struct sync_flag foo_gone;
 
 static void foo_receive_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, const void *data, size_t len) {
@@ -62,6 +63,7 @@ static bool accept_cb(meshlink_handle_t *mesh, meshlink_channel_t *channel, uint
 
 	meshlink_set_node_status_cb(mesh, bar_status_cb);
 	meshlink_set_channel_receive_cb(mesh, channel, bar_receive_cb);
+	set_sync_flag(&foo_connected, true);
 
 	if(data) {
 		bar_receive_cb(mesh, channel, data, len);
@@ -166,6 +168,7 @@ static int main2(int rfd, int wfd) {
 
 	assert(meshlink_start(mesh));
 
+	assert(wait_sync_flag(&foo_connected, 20));
 	assert(wait_sync_flag(&foo_gone, 20));
 
 	meshlink_close(mesh);