mirror of
https://github.com/GNS3/gns3-server
synced 2024-11-17 22:08:35 +00:00
70 lines
2.1 KiB
Python
70 lines
2.1 KiB
Python
#!/usr/bin/env python
|
|
#
|
|
# Copyright (C) 2016 GNS3 Technologies Inc.
|
|
#
|
|
# This program is free software: you can redistribute it and/or modify
|
|
# it under the terms of the GNU General Public License as published by
|
|
# the Free Software Foundation, either version 3 of the License, or
|
|
# (at your option) any later version.
|
|
#
|
|
# This program is distributed in the hope that it will be useful,
|
|
# but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
# GNU General Public License for more details.
|
|
#
|
|
# You should have received a copy of the GNU General Public License
|
|
# along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
from contextlib import contextmanager
|
|
|
|
|
|
from ..notification_queue import NotificationQueue
|
|
|
|
|
|
class NotificationManager:
|
|
"""
|
|
Manage the notification queue where the controller
|
|
will connect to get notifications from computes
|
|
"""
|
|
|
|
def __init__(self):
|
|
self._listeners = set()
|
|
|
|
@contextmanager
|
|
def queue(self):
|
|
"""
|
|
Get a queue of notifications
|
|
|
|
Use it with Python with
|
|
"""
|
|
queue = NotificationQueue()
|
|
self._listeners.add(queue)
|
|
yield queue
|
|
self._listeners.remove(queue)
|
|
|
|
def emit(self, action, event, **kwargs):
|
|
"""
|
|
Send an event to all the client listening for notifications
|
|
|
|
:param action: Action name
|
|
:param event: Event to send
|
|
:param kwargs: Add this meta to the notif (project_id for example)
|
|
"""
|
|
for listener in self._listeners:
|
|
listener.put_nowait((action, event, kwargs))
|
|
|
|
@staticmethod
|
|
def reset():
|
|
NotificationManager._instance = None
|
|
|
|
@staticmethod
|
|
def instance():
|
|
"""
|
|
Singleton to return only on instance of NotificationManager.
|
|
:returns: instance of NotificationManager
|
|
"""
|
|
|
|
if not hasattr(NotificationManager, '_instance') or NotificationManager._instance is None:
|
|
NotificationManager._instance = NotificationManager()
|
|
return NotificationManager._instance
|