initial WSRouter implementation

backend/decky_loader/wsrouter.py

@@ -0,0 +1,46 @@
+from logging import getLogger
+
+from aiohttp import web
+
+
+class WSRouter:
+    def __init__(self) -> None:
+        self.ws = None
+        self.routes = {}
+        self.logger = getLogger("WSRouter")
+
+    async def add_routes(self, routes):
+        self.routes.update(routes)
+
+    async def handle(self, request):
+        self.logger.debug('Websocket connection starting')
+        ws = web.WebSocketResponse()
+        await ws.prepare(request)
+        self.logger.debug('Websocket connection ready')
+
+        self.ws = ws
+        
+        try:
+            async for msg in ws:
+                self.logger.debug(msg)
+                if msg.type == aiohttp.WSMsgType.TEXT:
+                    self.logger.debug(msg.data)
+                    if msg.data == 'close':
+                        # DO NOT RELY ON THIS!
+                        break
+                    else:
+                        # do stuff with the message
+                        data = msg.json()
+                        if self.routes[data.route]:
+                            res = await self.routes[data.route](data.data)
+        finally:
+            try:
+                await ws.close()
+            except:
+                pass
+
+        self.logger.debug('Websocket connection closed')
+        return ws
+
+    async def write(self, dta: Dict[str, any]):
+        await self.ws.send_json(dta)