2020-10-02 06:37:50 +00:00
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# -*- coding: utf-8 -*-
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#
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# Copyright (C) 2020 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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"""
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API endpoints for compute notifications.
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"""
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2020-10-19 04:30:41 +00:00
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import asyncio
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from fastapi import APIRouter, WebSocket
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2020-10-02 06:37:50 +00:00
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from gns3server.compute.notification_manager import NotificationManager
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2020-10-19 04:30:41 +00:00
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from starlette.endpoints import WebSocketEndpoint
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2020-10-02 06:37:50 +00:00
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import logging
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log = logging.getLogger(__name__)
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router = APIRouter()
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2020-10-19 04:30:41 +00:00
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@router.websocket_route("/notifications/ws")
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class ComputeWebSocketNotifications(WebSocketEndpoint):
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"""
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Receive compute notifications about the controller from WebSocket stream.
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"""
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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async def on_connect(self, websocket: WebSocket) -> None:
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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await websocket.accept()
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log.info(f"New client {websocket.client.host}:{websocket.client.port} has connected to compute WebSocket")
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self._notification_task = asyncio.ensure_future(self._stream_notifications(websocket))
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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async def on_disconnect(self, websocket: WebSocket, close_code: int) -> None:
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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self._notification_task.cancel()
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log.info(f"Client {websocket.client.host}:{websocket.client.port} has disconnected from controller WebSocket"
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f" with close code {close_code}")
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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async def _stream_notifications(self, websocket: WebSocket) -> None:
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2020-10-02 06:37:50 +00:00
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2020-10-19 04:30:41 +00:00
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with NotificationManager.instance().queue() as queue:
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2020-10-02 06:37:50 +00:00
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while True:
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notification = await queue.get_json(5)
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2020-10-19 04:30:41 +00:00
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await websocket.send_text(notification)
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if __name__ == '__main__':
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import uvicorn
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from fastapi import FastAPI
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from starlette.responses import HTMLResponse
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app = FastAPI()
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app.include_router(router)
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html = """
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<!DOCTYPE html>
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<html>
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<body>
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<ul id='messages'>
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</ul>
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<script>
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var ws = new WebSocket("ws://localhost:8000/notifications/ws");
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ws.onmessage = function(event) {
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var messages = document.getElementById('messages')
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var message = document.createElement('li')
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var content = document.createTextNode(event.data)
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message.appendChild(content)
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messages.appendChild(message)
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};
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</script>
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</body>
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</html>
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"""
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@app.get("/")
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async def get() -> HTMLResponse:
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return HTMLResponse(html)
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uvicorn.run(app, host="localhost", port=8000)
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