maybe working multiclient

backend/psn_server.py

@@ -20,21 +20,19 @@ class TrackerData:
 
 
 trackers = {}
-
+ws_clients = set()
 
 for i in range(NUM_TRACKERS):
     trackers[i] = psn.Tracker(i, f"Tracker {i}")
     trackers[i].set_pos(psn.Float3(0, 0, 0))
 
-def update_trackers(tracker_data_json: str):
+def update_tracker(tracker_data_json: str):
     global trackers
-    tracker_data = [TrackerData(**data) for data in json.loads(tracker_data_json)]
+    tracker = TrackerData(**json.loads(tracker_data_json))
-
-    for tracker in tracker_data:
     trackers[tracker.id].set_pos(psn.Float3(tracker.x, tracker.y, 0))
 
 def trackers_to_json():
-    return json.dumps([{"id": tracker.id, "x": tracker.pos.x, "y": tracker.pos.y} for tracker in trackers.values()])
+    return json.dumps([{"id": tracker.get_id(), "x": tracker.get_pos().x, "y": tracker.get_pos().y} for tracker in trackers.values()])
 
 sock = socket.socket(socket.AF_INET, socket.SOCK_DGRAM)
 
@@ -52,8 +50,11 @@ def get_elapsed_time_ms():
 def pic_to_scene_coords(x, y):
     return x / 200, y / 200
 
+async def update_all_clients():
+    for ws in ws_clients:
+        await ws.send_str(trackers_to_json())
 
-def send_positions():
+def send_psn_positions():
     encoder = psn.Encoder("Server 1")
 
     packets = encoder.encode_data(trackers, get_elapsed_time_ms())
@@ -67,15 +68,17 @@ async def handle_websocket(request):
     await ws.prepare(request)
     logging.debug("Websocket connection ready")
 
-    ws.send_str(trackers_to_json())
+    ws_clients.add(ws)
+
+    await ws.send_str(trackers_to_json())
 
     try:
         async for msg in ws:
             logging.debug(f"Websocket data: {msg}")
             if msg.type == web.WSMsgType.TEXT:
-                logging.debug("Received message: %s" % msg.data)
+                # Each message is a single tracker object
-                update_trackers(msg.data)
+                update_tracker(msg.data)
-                send_positions()
+                await update_all_clients()
 
             elif msg.type == web.WSMsgType.ERROR:
                 logging.error("ws connection closed with exception %s" % ws.exception())
@@ -87,6 +90,8 @@ async def handle_websocket(request):
         logging.debug("Websocket connection closing")
         await ws.close()
 
+    ws_clients.remove(ws)
+
     return ws
 
 
@@ -99,8 +104,8 @@ async def handle_root(request):
 def create_app():
     app = web.Application()
     app.router.add_get("/", handle_root)
-    app.router.add_static("/", "./static")
     app.router.add_get("/ws", handle_websocket)
+    app.router.add_static("/", "./static")
     return app