Refactor asyncio locking system for Python 3.7 support. Ref https://github.com/GNS3/gns3-gui/issues/2566 Ref https://github.com/GNS3/gns3-gui/issues/2568

gns3server/controller/project.py

@@ -36,7 +36,7 @@ from .udp_link import UDPLink
 from ..config import Config
 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 locking
 from ..utils.asyncio import wait_run_in_executor
 from ..utils.asyncio import asyncio_ensure_future
 from .export_project import export_project
@@ -525,7 +525,8 @@ class Project:
             self.dump()
         return node
 
-    @locked_coroutine
+    @locking
+    @asyncio.coroutine
     def __delete_node_links(self, node):
         """
         Delete all link connected to this node.
@@ -783,7 +784,8 @@ class Project:
     def _topology_file(self):
         return os.path.join(self.path, self._filename)
 
-    @locked_coroutine
+    @locking
+    @asyncio.coroutine
     def open(self):
         """
         Load topology elements