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gns3-server/gns3server/handlers/api/controller/notification_handler.py

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# -*- 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.controller import Controller
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",
description="Receive notifications about the controller",
status_codes={
200: "End of stream"
})
async def notification(request, response):
controller = Controller.instance()
response.content_type = "application/json"
response.set_status(200)
response.enable_chunked_encoding()
await response.prepare(request)
with controller.notification.controller_queue() as queue:
while True:
msg = await queue.get_json(5)
await response.write(("{}\n".format(msg)).encode("utf-8"))
@Route.get(
r"/notifications/ws",
description="Receive notifications about controller from a Websocket",
status_codes={
200: "End of stream"
})
async def notification_ws(request, response):
controller = Controller.instance()
ws = aiohttp.web.WebSocketResponse()
await ws.prepare(request)
request.app['websockets'].add(ws)
asyncio.ensure_future(process_websocket(ws))
log.info("New client has connected to controller WebSocket")
try:
with controller.notification.controller_queue() as queue:
while True:
notification = await queue.get_json(5)
if ws.closed:
break
await ws.send_str(notification)
finally:
log.info("Client has disconnected from controller WebSocket")
if not ws.closed:
await ws.close()
request.app['websockets'].discard(ws)
return ws