Fix asyncio error when closing the app

Fix #310, https://github.com/GNS3/gns3-gui/issues/705

gns3server/modules/base_vm.py

@@ -61,7 +61,6 @@ class BaseVM:
 
     def __del__(self):
 
-        self.close()
         if self._temporary_directory is not None:
             if os.path.exists(self._temporary_directory):
                 shutil.rmtree(self._temporary_directory, ignore_errors=True)

gns3server/modules/qemu/qemu_vm.py

@@ -588,7 +588,7 @@ class QemuVM(BaseVM):
                 log.error("Could not start QEMU {}: {}\n{}".format(self.qemu_path, e, stdout))
                 raise QemuError("Could not start QEMU {}: {}\n{}".format(self.qemu_path, e, stdout))
 
-            self._set_process_priority()
+            yield from self._set_process_priority()
             if self._cpu_throttling:
                 self._set_cpu_throttling()
 
@@ -603,7 +603,7 @@ class QemuVM(BaseVM):
             log.info('Stopping QEMU VM "{}" PID={}'.format(self._name, self._process.pid))
             try:
                 self._process.terminate()
-                self._process.wait()
+                yield from self._process.wait()
             except subprocess.TimeoutExpired:
                 try:
                     self._process.kill()

gns3server/server.py

@@ -103,10 +103,9 @@ class Server:
 
     def _signal_handling(self):
 
-        @asyncio.coroutine
         def signal_handler(signame):
             log.warning("Server has got signal {}, exiting...".format(signame))
-            yield from self.shutdown_server()
+            asyncio.async(self.shutdown_server())
 
         signals = ["SIGTERM", "SIGINT"]
         if sys.platform.startswith("win"):
@@ -115,7 +114,7 @@ class Server:
             signals.extend(["SIGHUP", "SIGQUIT"])
 
         for signal_name in signals:
-            callback = functools.partial(asyncio.async, signal_handler(signal_name))
+            callback = functools.partial(signal_handler, signal_name)
             if sys.platform.startswith("win"):
                 # add_signal_handler() is not yet supported on Windows
                 signal.signal(getattr(signal, signal_name), callback)