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Alexis Métaireau
fc2de3fc53
Using [pytest-xprocess](https://pytest-xprocess.readthedocs.io/) proved not being as useful as I thought at first, because it was causing intermitent failures when starting the process. The code now directly uses `subprocess.popen` calls to start the server. The tests are grouped together using the following decorator: `@pytest.mark.xdist_group(name="websockets")` Tests now need to be run with the `pytest --dist loadgroup` so that all tests of the same group happen on the same process. More details on this blogpost: https://blog.notmyidea.org/start-a-process-when-using-pytest-xdist.html
92 lines
3 KiB
Python
92 lines
3 KiB
Python
#!/usr/bin/env python
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import asyncio
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from collections import defaultdict
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from typing import Literal, Optional
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import websockets
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from django.conf import settings
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from django.core.signing import TimestampSigner
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from pydantic import BaseModel, ValidationError
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from websockets import WebSocketClientProtocol
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from websockets.server import serve
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from umap.models import Map, User # NOQA
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# Contains the list of websocket connections handled by this process.
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# It's a mapping of map_id to a set of the active websocket connections
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CONNECTIONS = defaultdict(set)
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class JoinMessage(BaseModel):
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kind: str = "join"
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token: str
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class OperationMessage(BaseModel):
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kind: str = "operation"
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verb: str = Literal["upsert", "update", "delete"]
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subject: str = Literal["map", "layer", "feature"]
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metadata: Optional[dict] = None
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key: Optional[str] = None
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async def join_and_listen(
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map_id: int, permissions: list, user: str | int, websocket: WebSocketClientProtocol
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):
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"""Join a "room" whith other connected peers.
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New messages will be broadcasted to other connected peers.
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"""
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print(f"{user} joined room #{map_id}")
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CONNECTIONS[map_id].add(websocket)
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try:
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async for raw_message in websocket:
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# recompute the peers-list at the time of message-sending.
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# as doing so beforehand would miss new connections
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peers = CONNECTIONS[map_id] - {websocket}
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# Only relay valid "operation" messages
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try:
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OperationMessage.model_validate_json(raw_message)
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websockets.broadcast(peers, raw_message)
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except ValidationError as e:
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error = f"An error occurred when receiving this message: {raw_message}"
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print(error, e)
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finally:
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CONNECTIONS[map_id].remove(websocket)
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async def handler(websocket):
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"""Main WebSocket handler.
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If permissions are granted, let the peer enter a room.
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"""
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raw_message = await websocket.recv()
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# The first event should always be 'join'
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message: JoinMessage = JoinMessage.model_validate_json(raw_message)
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signed = TimestampSigner().unsign_object(message.token, max_age=30)
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user, map_id, permissions = signed.values()
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# Check if permissions for this map have been granted by the server
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if "edit" in signed["permissions"]:
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await join_and_listen(map_id, permissions, user, websocket)
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def run(host, port):
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if not settings.WEBSOCKET_ENABLED:
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msg = (
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"WEBSOCKET_ENABLED should be set to True to run the WebSocket Server. "
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"See the documentation at "
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"https://docs.umap-project.org/en/stable/config/settings/#websocket_enabled "
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"for more information."
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)
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print(msg)
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exit(1)
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async def _serve():
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async with serve(handler, host, port):
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print(f"Waiting for connections on {host}:{port}")
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await asyncio.Future() # run forever
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asyncio.run(_serve())
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