From d42dc370cfb728d5c4fa53b759210edd032eea04 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Alexis=20M=C3=A9taireau?= <alexis@notmyidea.org>
Date: Fri, 31 May 2024 19:34:26 +0200
Subject: [PATCH] refactor(sync): rename `ws.py` to `websocket_server.py`

Hopefully this is clearer :-)
---
 .../commands/run_websocket_server.py          |  4 +-
 umap/ws.py                                    | 92 -------------------
 2 files changed, 2 insertions(+), 94 deletions(-)
 delete mode 100644 umap/ws.py

diff --git a/umap/management/commands/run_websocket_server.py b/umap/management/commands/run_websocket_server.py
index 62fb21428..2cb2db891 100644
--- a/umap/management/commands/run_websocket_server.py
+++ b/umap/management/commands/run_websocket_server.py
@@ -1,7 +1,7 @@
 from django.conf import settings
 from django.core.management.base import BaseCommand
 
-from umap import ws
+from umap import websocket_server
 
 
 class Command(BaseCommand):
@@ -20,4 +20,4 @@ def add_arguments(self, parser):
         )
 
     def handle(self, *args, **options):
-        ws.run(options["host"], options["port"])
+        websocket_server.run(options["host"], options["port"])
diff --git a/umap/ws.py b/umap/ws.py
deleted file mode 100644
index 3ba81394f..000000000
--- a/umap/ws.py
+++ /dev/null
@@ -1,92 +0,0 @@
-#!/usr/bin/env python
-
-import asyncio
-from collections import defaultdict
-from typing import Literal, Optional
-
-import websockets
-from django.conf import settings
-from django.core.signing import TimestampSigner
-from pydantic import BaseModel, ValidationError
-from websockets import WebSocketClientProtocol
-from websockets.server import serve
-
-from umap.models import Map, User  # NOQA
-
-# Contains the list of websocket connections handled by this process.
-# It's a mapping of map_id to a set of the active websocket connections
-CONNECTIONS = defaultdict(set)
-
-
-class JoinMessage(BaseModel):
-    kind: str = "join"
-    token: str
-
-
-class OperationMessage(BaseModel):
-    kind: str = "operation"
-    verb: str = Literal["upsert", "update", "delete"]
-    subject: str = Literal["map", "layer", "feature"]
-    metadata: Optional[dict] = None
-    key: Optional[str] = None
-
-
-async def join_and_listen(
-    map_id: int, permissions: list, user: str | int, websocket: WebSocketClientProtocol
-):
-    """Join a "room" whith other connected peers.
-
-    New messages will be broadcasted to other connected peers.
-    """
-    print(f"{user} joined room #{map_id}")
-    CONNECTIONS[map_id].add(websocket)
-    try:
-        async for raw_message in websocket:
-            # recompute the peers-list at the time of message-sending.
-            # as doing so beforehand would miss new connections
-            peers = CONNECTIONS[map_id] - {websocket}
-            # Only relay valid "operation" messages
-            try:
-                OperationMessage.model_validate_json(raw_message)
-                websockets.broadcast(peers, raw_message)
-            except ValidationError as e:
-                error = f"An error occurred when receiving this message: {raw_message}"
-                print(error, e)
-    finally:
-        CONNECTIONS[map_id].remove(websocket)
-
-
-async def handler(websocket):
-    """Main WebSocket handler.
-
-    If permissions are granted, let the peer enter a room.
-    """
-    raw_message = await websocket.recv()
-
-    # The first event should always be 'join'
-    message: JoinMessage = JoinMessage.model_validate_json(raw_message)
-    signed = TimestampSigner().unsign_object(message.token, max_age=30)
-    user, map_id, permissions = signed.values()
-
-    # Check if permissions for this map have been granted by the server
-    if "edit" in signed["permissions"]:
-        await join_and_listen(map_id, permissions, user, websocket)
-
-
-def run(host, port):
-    if not settings.WEBSOCKET_ENABLED:
-        msg = (
-            "WEBSOCKET_ENABLED should be set to True to run the WebSocket Server. "
-            "See the documentation at "
-            "https://docs.umap-project.org/en/stable/config/settings/#websocket_enabled "
-            "for more information."
-        )
-        print(msg)
-        exit(1)
-
-    async def _serve():
-        async with serve(handler, host, port):
-            print(f"Waiting for connections on {host}:{port}")
-            await asyncio.Future()  # run forever
-
-    asyncio.run(_serve())