move route code out of server into own blueprints and cleanup the codebase

server/services/dashboard_ws_hub.py

@@ -0,0 +1,61 @@
+import asyncio, json
+
+class DashboardWebSocketHub:
+  def __init__(self):
+    self.subscribers:set[asyncio.Queue[str]] = set()
+    self.subscribers_lock = asyncio.Lock()
+
+    self.ws_tasks:set[asyncio.Task] = set()
+    self.ws_tasks_lock = asyncio.Lock()
+
+    self.shutdown_event = asyncio.Event()
+    self.shutdown_message = json.dumps({"type": "dashboard_ws_shutdown"})
+
+  async def register_subscriber(self, subscriber_queue:asyncio.Queue[str]) -> None:
+    async with self.subscribers_lock:
+      self.subscribers.add(subscriber_queue)
+
+  async def unregister_subscriber(self, subscriber_queue:asyncio.Queue[str]) -> None:
+    async with self.subscribers_lock:
+      self.subscribers.discard(subscriber_queue)
+
+  async def register_task(self, websocket_task:asyncio.Task) -> None:
+    async with self.ws_tasks_lock:
+      self.ws_tasks.add(websocket_task)
+
+  async def unregister_task(self, websocket_task:asyncio.Task) -> None:
+    async with self.ws_tasks_lock:
+      self.ws_tasks.discard(websocket_task)
+
+  async def broadcast_payload(self, payload:dict) -> None:
+    encoded_payload = json.dumps(payload)
+    async with self.subscribers_lock:
+      subscribers = tuple(self.subscribers)
+
+    for subscriber_queue in subscribers:
+      if subscriber_queue.full():
+        try:
+          subscriber_queue.get_nowait()
+        except asyncio.QueueEmpty:
+          pass
+
+      try:
+        subscriber_queue.put_nowait(encoded_payload)
+      except asyncio.QueueFull:
+        continue
+
+  def request_shutdown(self) -> None:
+    if self.shutdown_event.is_set():
+      return
+
+    self.shutdown_event.set()
+    for subscriber_queue in tuple(self.subscribers):
+      if subscriber_queue.full():
+        try:
+          subscriber_queue.get_nowait()
+        except asyncio.QueueEmpty:
+          pass
+      try:
+        subscriber_queue.put_nowait(self.shutdown_message)
+      except asyncio.QueueFull:
+        continue