gns3-server/gns3server/api/routes/controller/notifications.py

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#
# Copyright (C) 2020 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/>.
"""
API routes for controller notifications.
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"""
from fastapi import APIRouter, WebSocket, WebSocketDisconnect
from fastapi.responses import StreamingResponse
from websockets.exceptions import ConnectionClosed, WebSocketException
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from gns3server.controller import Controller
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import logging
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log = logging.getLogger(__name__)
router = APIRouter()
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@router.get("")
async def http_notification() -> StreamingResponse:
"""
Receive controller notifications about the controller from HTTP stream.
"""
async def event_stream():
with Controller.instance().notification.controller_queue() as queue:
while True:
msg = await queue.get_json(5)
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yield (f"{msg}\n").encode("utf-8")
return StreamingResponse(event_stream(), media_type="application/json")
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@router.websocket("/ws")
async def notification_ws(websocket: WebSocket) -> None:
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"""
Receive project notifications about the controller from WebSocket.
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"""
await websocket.accept()
log.info(f"New client {websocket.client.host}:{websocket.client.port} has connected to controller WebSocket")
try:
with Controller.instance().notification.controller_queue() as queue:
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while True:
notification = await queue.get_json(5)
await websocket.send_text(notification)
except (ConnectionClosed, WebSocketDisconnect):
log.info(f"Client {websocket.client.host}:{websocket.client.port} has disconnected from controller WebSocket")
except WebSocketException as e:
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log.warning(f"Error while sending to controller event to WebSocket client: {e}")
finally:
await websocket.close()