remove path data from thumbnail payloads

frigate/camera/state.py

@@ -396,7 +396,6 @@ class CameraState:
                 "attributes": new_obj.obj_data["attributes"],
                 "current_estimated_speed": 0,
                 "velocity_angle": 0,
-                "path_data": [],
                 "recognized_license_plate": None,
                 "recognized_license_plate_score": None,
             }

frigate/comms/ws.py

@@ -3,6 +3,8 @@
 import errno
 import json
 import logging
+import queue
+import socket
 import threading
 from collections.abc import Callable
 from typing import Any
@@ -74,6 +76,9 @@ _WS_VIEWER_TOPICS = frozenset(
 # Camera-scoped command topics a camera-authorized (non-admin) user may send.
 _WS_CAMERA_COMMAND_TOPICS = frozenset({"ptz"})
 
+# Max outbound messages waiting on a client's writer thread.
+WS_MAX_PENDING_MESSAGES = 256
+
 
 def _check_ws_authorization(
     topic: str,
@@ -446,6 +451,63 @@ def _materialize_for_ws(
 
 
 class WebSocket(WebSocket_):  # type: ignore[misc]
+    def __init__(self, *args: Any, **kwargs: Any) -> None:
+        super().__init__(*args, **kwargs)
+        self._send_queue: queue.Queue[tuple[Any, bool] | None] = queue.Queue(
+            maxsize=WS_MAX_PENDING_MESSAGES
+        )
+        self._writer: threading.Thread | None = None
+        self._aborted = False
+
+    def opened(self) -> None:
+        # every client gets its own writer so a client that stops reading only
+        # blocks itself, never the thread that called publish()
+        self._writer = threading.Thread(
+            target=self._drain_send_queue, name="ws_writer", daemon=True
+        )
+        self._writer.start()
+
+    def send(self, payload: Any, binary: bool = False) -> None:
+        try:
+            self._send_queue.put_nowait((payload, binary))
+        except queue.Full:
+            self._abort("Websocket client is not keeping up, disconnecting it")
+
+    def _drain_send_queue(self) -> None:
+        while True:
+            item = self._send_queue.get()
+            if item is None or self.terminated or self.sock is None:
+                return
+            try:
+                super().send(*item)
+            except Exception:
+                self._abort()
+                return
+
+    def _abort(self, reason: str | None = None) -> None:
+        # publish() keeps hitting a full queue until the manager thread removes
+        # the connection, so only act (and log) the first time
+        if self._aborted:
+            return
+        self._aborted = True
+        if reason:
+            logger.warning(reason)
+
+        # shutdown rather than close so the ws4py manager thread sees EOF and
+        # runs its normal unregister/terminate; this also unblocks a stuck sendall
+        sock = self.sock
+        if sock is not None:
+            try:
+                sock.shutdown(socket.SHUT_RDWR)
+            except OSError:
+                pass
+
+    def closed(self, code: int, reason: str | None = None) -> None:
+        try:
+            self._send_queue.put_nowait(None)
+        except queue.Full:
+            pass
+
     def unhandled_error(self, error: Any) -> None:
         """
         Handles the unfriendly socket closures on the server side
@@ -580,10 +642,7 @@ class WebSocketClient(Communicator):
             )
             if message is None:
                 continue
-            try:
-                ws.send(message)
-            except (ConnectionResetError, BrokenPipeError, ValueError):
-                pass
+            ws.send(message)
 
     def stop(self) -> None:
         if self.websocket_server is not None:

frigate/test/test_ws_send_queue.py

@@ -0,0 +1,107 @@
+"""Outbound websocket sends must never block the thread calling publish()."""
+
+import socket
+import threading
+import unittest
+
+from frigate.comms.ws import WS_MAX_PENDING_MESSAGES, WebSocket
+
+
+class _FakeSock:
+    """Socket stand-in; ``block`` makes sendall hang like a client that stopped reading."""
+
+    def __init__(self, block: bool = False) -> None:
+        self.block = block
+        self.released = threading.Event()
+        self.shutdown_called = threading.Event()
+        self.frames: list[bytes] = []
+
+    def sendall(self, data: bytes) -> None:
+        if self.block and not self.released.is_set():
+            self.released.wait(timeout=10)
+            raise BrokenPipeError()
+        self.frames.append(data)
+
+    def shutdown(self, how: int) -> None:
+        assert how == socket.SHUT_RDWR
+        self.shutdown_called.set()
+        self.released.set()
+
+    def close(self) -> None:
+        pass
+
+    def fileno(self) -> int:
+        return 99
+
+
+def _wait_for(predicate, timeout: float = 2.0) -> bool:
+    deadline = threading.Event()
+    for _ in range(int(timeout / 0.01)):
+        if predicate():
+            return True
+        deadline.wait(0.01)
+    return predicate()
+
+
+class TestWebSocketSendQueue(unittest.TestCase):
+    def _open(self, sock: _FakeSock) -> WebSocket:
+        ws = WebSocket(sock)
+        ws.opened()
+        return ws
+
+    def test_stalled_client_does_not_block_publisher(self):
+        sock = _FakeSock(block=True)
+        ws = self._open(sock)
+
+        def publish_many():
+            for i in range(WS_MAX_PENDING_MESSAGES + 5):
+                ws.send(f"message {i}")
+
+        publisher = threading.Thread(target=publish_many, daemon=True)
+        publisher.start()
+        publisher.join(timeout=2.0)
+
+        self.assertFalse(publisher.is_alive(), "publish() blocked on a stalled client")
+        self.assertTrue(
+            sock.shutdown_called.wait(timeout=2.0),
+            "a client that cannot keep up should be disconnected",
+        )
+
+    def test_overflow_warns_and_shuts_down_once(self):
+        sock = _FakeSock(block=True)
+        ws = self._open(sock)
+        shutdown_calls = []
+        original_shutdown = sock.shutdown
+        sock.shutdown = lambda how: (shutdown_calls.append(how), original_shutdown(how))
+
+        with self.assertLogs("frigate.comms.ws", level="WARNING") as logs:
+            # keep publishing after overflow, as the dispatcher does until the
+            # manager thread removes the connection
+            for i in range(WS_MAX_PENDING_MESSAGES * 3):
+                ws.send(f"message {i}")
+
+        self.assertEqual(len(logs.output), 1)
+        self.assertEqual(len(shutdown_calls), 1)
+
+    def test_messages_delivered_in_order(self):
+        sock = _FakeSock()
+        ws = self._open(sock)
+        for i in range(3):
+            ws.send(f"message {i}")
+
+        self.assertTrue(_wait_for(lambda: len(sock.frames) == 3))
+        for i, frame in enumerate(sock.frames):
+            self.assertIn(f"message {i}".encode(), frame)
+        self.assertFalse(sock.shutdown_called.is_set())
+
+    def test_closed_stops_writer_thread(self):
+        sock = _FakeSock()
+        ws = self._open(sock)
+        writer = ws._writer
+        ws.closed(1000, "bye")
+        writer.join(timeout=2.0)
+        self.assertFalse(writer.is_alive())
+
+
+if __name__ == "__main__":
+    unittest.main()

frigate/track/tracked_object.py

@@ -164,7 +164,6 @@ class TrackedObject:
                         "attributes": obj_data["attributes"],
                         "current_estimated_speed": self.current_estimated_speed,
                         "velocity_angle": self.velocity_angle,
-                        "path_data": self.path_data.copy(),
                         "recognized_license_plate": obj_data.get(
                             "recognized_license_plate"
                         ),