#
# 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 compute notifications.
"""
import base64
import binascii
from fastapi import APIRouter, WebSocket, WebSocketDisconnect, status, HTTPException
from fastapi.security.utils import get_authorization_scheme_param
from websockets.exceptions import ConnectionClosed, WebSocketException
from gns3server.compute.notification_manager import NotificationManager
import logging
log = logging.getLogger(__name__)
router = APIRouter()
@router.websocket("/notifications/ws")
async def notification_ws(websocket: WebSocket) -> None:
"""
Receive project notifications about the project from WebSocket.
"""
await websocket.accept()
# handle basic HTTP authentication
invalid_user_credentials_exc = HTTPException(
status_code=status.HTTP_401_UNAUTHORIZED,
detail="Invalid authentication credentials",
headers={"WWW-Authenticate": "Basic"},
)
try:
authorization = websocket.headers.get("Authorization")
scheme, param = get_authorization_scheme_param(authorization)
if not authorization or scheme.lower() != "basic":
raise invalid_user_credentials_exc
try:
data = base64.b64decode(param).decode("ascii")
except (ValueError, UnicodeDecodeError, binascii.Error):
raise invalid_user_credentials_exc
username, separator, password = data.partition(":")
if not separator:
raise invalid_user_credentials_exc
except invalid_user_credentials_exc as e:
websocket_error = {"action": "log.error", "event": {"message": f"Could not authenticate while connecting to "
f"compute WebSocket: {e.detail}"}}
await websocket.send_json(websocket_error)
return await websocket.close(code=1008)
log.info(f"New client {websocket.client.host}:{websocket.client.port} has connected to compute WebSocket")
try:
with NotificationManager.instance().queue() as queue:
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 compute WebSocket")
except WebSocketException as e:
log.warning(f"Error while sending to controller event to WebSocket client: {e}")
finally:
try:
await websocket.close()
except OSError:
pass # ignore OSError: [Errno 107] Transport endpoint is not connected
if __name__ == "__main__":
import uvicorn
from fastapi import FastAPI
from starlette.responses import HTMLResponse
app = FastAPI()
app.include_router(router)
html = """
<!DOCTYPE html>
<html>
<body>
<ul id='messages'>
</ul>
<script>
var ws = new WebSocket("ws://localhost:8000/notifications/ws");
ws.onmessage = function(event) {
var messages = document.getElementById('messages')
var message = document.createElement('li')
var content = document.createTextNode(event.data)
message.appendChild(content)
messages.appendChild(message)
};
</script>
</body>
</html>
"""
@app.get("/")
async def get() -> HTMLResponse:
return HTMLResponse(html)
uvicorn.run(app, host="localhost", port=8000)