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mirror of https://github.com/GNS3/gns3-server synced 2024-12-04 22:28:12 +00:00
gns3-server/gns3server/handlers/api/compute/notification_handler.py

65 lines
2.0 KiB
Python

# -*- coding: utf-8 -*-
#
# Copyright (C) 2015 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/>.
import asyncio
import aiohttp
from aiohttp.web import WebSocketResponse
from gns3server.web.route import Route
from gns3server.compute.notification_manager import NotificationManager
import logging
log = logging.getLogger(__name__)
async def process_websocket(ws):
"""
Process ping / pong and close message
"""
try:
await ws.receive()
except aiohttp.WSServerHandshakeError:
pass
class NotificationHandler:
@Route.get(
r"/notifications/ws",
description="Send notifications using Websockets")
async def notifications(request, response):
notifications = NotificationManager.instance()
ws = WebSocketResponse()
await ws.prepare(request)
request.app['websockets'].add(ws)
asyncio.ensure_future(process_websocket(ws))
log.info("New client has connected to compute WebSocket")
try:
with notifications.queue() as queue:
while True:
notification = await queue.get_json(1)
if ws.closed:
break
await ws.send_str(notification)
finally:
log.info("Client has disconnected from compute WebSocket")
if not ws.closed:
await ws.close()
request.app['websockets'].discard(ws)
return ws