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88 lines
2.8 KiB
88 lines
2.8 KiB
8 years ago
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#!/usr/bin/env python
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#
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# Copyright (C) 2016 GNS3 Technologies Inc.
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#
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# This program is free software: you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation, either version 3 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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from contextlib import contextmanager
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from ..notification_queue import NotificationQueue
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class Notification:
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"""
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Manage notification for the controller
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"""
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def __init__(self, controller):
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self._controller = controller
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self._listeners = {}
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@contextmanager
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def queue(self, project):
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"""
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Get a queue of notifications
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Use it with Python with
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"""
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queue = NotificationQueue()
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self._listeners.setdefault(project.id, set())
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self._listeners[project.id].add(queue)
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yield queue
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self._listeners[project.id].remove(queue)
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def emit(self, action, event, **kwargs):
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"""
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Send a notification to clients scoped by projects
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:param action: Action name
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:param event: Event to send
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:param kwargs: Add this meta to the notification
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"""
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if "project_id" in kwargs:
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project_id = kwargs.pop("project_id")
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self._send_event_to_project(project_id, action, event, **kwargs)
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else:
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self._send_event_to_all(action, event, **kwargs)
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def _send_event_to_project(self, project_id, action, event, **kwargs):
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"""
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Send an event to all the client listening for notifications for
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this project
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:param project: Project where we need to send the event
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:param action: Action name
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:param event: Event to send
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:param kwargs: Add this meta to the notification
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"""
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try:
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project_listeners = self._listeners[project_id]
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except KeyError:
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return
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for listener in project_listeners:
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listener.put_nowait((action, event, kwargs))
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def _send_event_to_all(self, action, event, **kwargs):
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"""
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Send an event to all the client listening for notifications on all
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projects
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:param action: Action name
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:param event: Event to send
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:param kwargs: Add this meta to the notification
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"""
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for project_listeners in self._listeners.values():
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for listener in project_listeners:
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listener.put_nowait((action, event, kwargs))
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