New web interface, move llm engine to separate process

sia/web/state_websocket.py

@@ -0,0 +1,54 @@
+from aiohttp import web, WSMsgType
+from typing import Dict, Set
+
+from .util import wrap_async
+from ..web_agent import WebAgent, AgentState
+
+class StateWebSocket:
+    """
+    WebSocket handler for agent state changes.
+    Broadcasts state updates to all connected clients.
+    """
+    
+    def __init__(self, agent: WebAgent):
+        self._agent = agent
+        self._clients: Set[web.WebSocketResponse] = set()
+        self._agent.add_state_change_handler(wrap_async(self._handle_change))
+        self._agent.add_selected_llm_change_handler(wrap_async(self._handle_change))
+        
+    async def _broadcast_message(self, message: Dict):
+        """Broadcast message to all connected clients."""
+        disconnected = set()
+        for ws in self._clients:
+            try:
+                await ws.send_json(message)
+            except ConnectionResetError:
+                disconnected.add(ws)
+        self._clients -= disconnected
+    
+    async def _handle_change(self, arg):
+        """Handle changes to the active LLM."""
+        await self._broadcast_message({
+            "state": self._agent.state.name,
+            "active_llm": self._agent.active_llm
+        })
+
+    async def handle_connection(self, request: web.Request) -> web.WebSocketResponse:
+        """Handle new WebSocket connections."""
+        ws = web.WebSocketResponse(heartbeat=30)
+        await ws.prepare(request)
+        
+        try:
+            # Send initial state
+            await ws.send_json({
+                "state": self._agent.state.name,
+                "active_llm": self._agent.active_llm
+            })
+            self._clients.add(ws)
+            async for msg in ws:
+                if msg.type == WSMsgType.ERROR:
+                    print(f"WebSocket connection closed with error: {ws.exception()}")
+        finally:
+            self._clients.remove(ws)
+            
+        return ws