Use asyncio.ensure_future() instead of asyncio.async() with conservative approach to support Python < 3.4.4. Fixes https://github.com/GNS3/gns3-gui/issues/2566

gns3server/controller/compute.py

@@ -27,7 +27,7 @@ from operator import itemgetter
 
 from ..utils import parse_version
 from ..utils.images import list_images
-from ..utils.asyncio import locked_coroutine
+from ..utils.asyncio import locked_coroutine, asyncio_ensure_future
 from ..controller.controller_error import ControllerError
 from ..version import __version__, __version_info__
 
@@ -418,7 +418,7 @@ class Compute:
                     if self._connection_failure == 5:
                         log.warning("Cannot connect to compute '{}': {}".format(self._id, e))
                         yield from self._controller.close_compute_projects(self)
-                    asyncio.get_event_loop().call_later(2, lambda: asyncio.async(self._try_reconnect()))
+                    asyncio.get_event_loop().call_later(2, lambda: asyncio_ensure_future(self._try_reconnect()))
                 return
             except aiohttp.web.HTTPNotFound:
                 raise aiohttp.web.HTTPConflict(text="The server {} is not a GNS3 server or it's a 1.X server".format(self._id))
@@ -494,7 +494,7 @@ class Compute:
 
         # Try to reconnect after 1 seconds if server unavailable only if not during tests (otherwise we create a ressources usage bomb)
         if not hasattr(sys, "_called_from_test") or not sys._called_from_test:
-            asyncio.get_event_loop().call_later(1, lambda: asyncio.async(self.connect()))
+            asyncio.get_event_loop().call_later(1, lambda: asyncio_ensure_future(self.connect()))
         self._ws = None
         self._cpu_usage_percent = None
         self._memory_usage_percent = None

gns3server/controller/gns3vm/__init__.py

@@ -21,7 +21,7 @@ import asyncio
 import aiohttp
 import ipaddress
 
-from ...utils.asyncio import locked_coroutine
+from ...utils.asyncio import locked_coroutine, asyncio_ensure_future
 from .vmware_gns3_vm import VMwareGNS3VM
 from .virtualbox_gns3_vm import VirtualBoxGNS3VM
 from .remote_gns3_vm import RemoteGNS3VM
@@ -302,7 +302,7 @@ class GNS3VM:
 
             # check if the VM is in the same subnet as the local server, start 10 seconds later to give
             # some time for the compute in the VM to be ready for requests
-            asyncio.get_event_loop().call_later(10, lambda: asyncio.async(self._check_network(compute)))
+            asyncio.get_event_loop().call_later(10, lambda: asyncio_ensure_future(self._check_network(compute)))
 
     @asyncio.coroutine
     def _check_network(self, compute):

gns3server/controller/link.py

@@ -22,6 +22,8 @@ import html
 import asyncio
 import aiohttp
 
+from gns3server.utils.asyncio import asyncio_ensure_future
+
 import logging
 log = logging.getLogger(__name__)
 
@@ -296,7 +298,7 @@ class Link:
 
         self._capturing = True
         self._capture_file_name = capture_file_name
-        self._streaming_pcap = asyncio.async(self._start_streaming_pcap())
+        self._streaming_pcap = asyncio_ensure_future(self._start_streaming_pcap())
         self._project.controller.notification.emit("link.updated", self.__json__())
 
     @asyncio.coroutine

gns3server/controller/project.py

@@ -38,6 +38,7 @@ from ..utils.path import check_path_allowed, get_default_project_directory
 from ..utils.asyncio.pool import Pool
 from ..utils.asyncio import locked_coroutine
 from ..utils.asyncio import wait_run_in_executor
+from ..utils.asyncio import asyncio_ensure_future
 from .export_project import export_project
 from .import_project import import_project
 
@@ -887,7 +888,7 @@ class Project:
             # Start all in the background without waiting for completion
             # we ignore errors because we want to let the user open
             # their project and fix it
-            asyncio.async(self.start_all())
+            asyncio_ensure_future(self.start_all())
 
     @asyncio.coroutine
     def wait_loaded(self):