Support to reset links. Fixes https://github.com/GNS3/gns3-server/issues/1620

gns3server/controller/link.py

@@ -305,6 +305,13 @@ class Link:
                 n["port"].link = None
                 n["node"].remove_link(self)
 
+    async def reset(self):
+        """
+        Reset a link
+        """
+
+        raise NotImplementedError
+
     async def start_capture(self, data_link_type="DLT_EN10MB", capture_file_name=None):
         """
         Start capture on the link

gns3server/controller/udp_link.py

@@ -141,7 +141,7 @@ class UDPLink(Link):
             return
         try:
             await node1.delete("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number1, port_number=port_number1), timeout=120)
-        # If the node is already delete (user selected multiple element and delete all in the same time)
+        # If the node is already deleted (user selected multiple element and delete all in the same time)
         except aiohttp.web.HTTPNotFound:
             pass
 
@@ -153,11 +153,20 @@ class UDPLink(Link):
             return
         try:
             await node2.delete("/adapters/{adapter_number}/ports/{port_number}/nio".format(adapter_number=adapter_number2, port_number=port_number2), timeout=120)
-        # If the node is already delete (user selected multiple element and delete all in the same time)
+        # If the node is already deleted (user selected multiple element and delete all in the same time)
         except aiohttp.web.HTTPNotFound:
             pass
         await super().delete()
 
+    async def reset(self):
+        """
+        Reset the link.
+        """
+
+        # recreate the link on the compute
+        await self.delete()
+        await self.create()
+
     async def start_capture(self, data_link_type="DLT_EN10MB", capture_file_name=None):
         """
         Start capture on a link

gns3server/handlers/api/controller/link_handler.py

@@ -200,6 +200,26 @@ class LinkHandler:
         await project.delete_link(request.match_info["link_id"])
         response.set_status(204)
 
+    @Route.post(
+        r"/projects/{project_id}/links/{link_id}/reset",
+        parameters={
+            "project_id": "Project UUID",
+            "link_id": "Link UUID"
+        },
+        status_codes={
+            201: "Link reset",
+            400: "Invalid request"
+        },
+        description="Reset link instance",
+        output=LINK_OBJECT_SCHEMA)
+    async def reset(request, response):
+
+        project = await Controller.instance().get_loaded_project(request.match_info["project_id"])
+        link = project.get_link(request.match_info["link_id"])
+        await link.reset()
+        response.set_status(201)
+        response.json(link)
+
     @Route.get(
         r"/projects/{project_id}/links/{link_id}/pcap",
         parameters={