Use a simple lock on memory creation task to prevent race conditions … #1004
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WalkthroughThis change introduces a simple lock mechanism to prevent race conditions during memory creation tasks in the transcription service. By using a boolean flag, we ensure that only one task is executed at a time, enhancing the stability and reliability of our system. Changes
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Files selected (1)
- backend/routers/transcribe_v2.py (2)
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- Review: 2
- LGTM: 0
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backend/routers/transcribe_v2.py
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| nonlocal memory_creation_task_lock | ||
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| if memory_creation_task is not None: | ||
| memory_creation_task.cancel() | ||
| try: | ||
| await memory_creation_task | ||
| except asyncio.CancelledError: | ||
| print("memory_creation_task is cancelled now") | ||
| if memory_creation_task_lock: | ||
| print("memory_creation_task_lock > lock") | ||
| return | ||
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| memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout)) | ||
| memory_creation_task_lock = True | ||
| try: | ||
| if memory_creation_task is not None: | ||
| memory_creation_task.cancel() | ||
| try: | ||
| await memory_creation_task | ||
| except asyncio.CancelledError: | ||
| print("memory_creation_task is cancelled now") | ||
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| memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout)) | ||
| finally: | ||
| memory_creation_task_lock = False |
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In this section, you're using the memory_creation_task_lock to prevent simultaneous task creation. However, the lock is not used correctly. The lock should be acquired before entering the critical section (where the shared resource is accessed) and released after exiting it. In Python's asyncio, you can use the async with statement to acquire and automatically release the lock. Also, the print statements used for debugging should be removed or replaced with proper logging.
- if memory_creation_task_lock:
- print("memory_creation_task_lock > lock")
- return
-
- memory_creation_task_lock = True
- try:
- if memory_creation_task is not None:
- memory_creation_task.cancel()
- try:
- await memory_creation_task
- except asyncio.CancelledError:
- print("memory_creation_task is cancelled now")
-
- memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout))
- finally:
- memory_creation_task_lock = False
+ async with memory_creation_task_lock:
+ if memory_creation_task is not None:
+ memory_creation_task.cancel()
+ try:
+ await memory_creation_task
+ except asyncio.CancelledError:
+ # Replace with proper logging
+ pass
+
+ memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout))This way, the lock is properly used to prevent race conditions during task creation and cancellation.
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Files selected (1)
- backend/routers/transcribe_v2.py (2)
Review comments generated (2)
- Review: 2
- LGTM: 0
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| @@ -160,6 +160,7 @@ async def _create_current_memory(): | |||
| return | |||
| await _create_memory(memory) | |||
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| memory_creation_task_lock = False | |||
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The memory_creation_task_lock is initialized as False but it's not clear if this variable is defined in a broader scope. If it's not, it should be defined before being used.
+ memory_creation_task_lock = False
memory_creation_task = None
seconds_to_trim = None
seconds_to_add = None| nonlocal memory_creation_task_lock | ||
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| if memory_creation_task is not None: | ||
| memory_creation_task.cancel() | ||
| try: | ||
| await memory_creation_task | ||
| except asyncio.CancelledError: | ||
| print("memory_creation_task is cancelled now") | ||
| if memory_creation_task_lock: | ||
| return | ||
|
|
||
| memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout)) | ||
| memory_creation_task_lock = True | ||
| try: | ||
| if memory_creation_task is not None: | ||
| memory_creation_task.cancel() | ||
| try: | ||
| await memory_creation_task | ||
| except asyncio.CancelledError: | ||
| print("memory_creation_task is cancelled now") | ||
| memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout)) | ||
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| finally: | ||
| memory_creation_task_lock = False |
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The lock mechanism introduced here seems to have a race condition itself. The check for memory_creation_task_lock and the setting of it to True are not atomic, meaning that two tasks could both pass the check before either has set the lock to True. This would defeat the purpose of the lock. A better approach might be to use an asyncio Lock or Semaphore which are designed to handle these situations correctly.
- nonlocal memory_creation_task_lock
-
- if memory_creation_task_lock:
- return
-
- memory_creation_task_lock = True
- try:
- if memory_creation_task is not None:
- memory_creation_task.cancel()
- try:
- await memory_creation_task
- except asyncio.CancelledError:
- print("memory_creation_task is cancelled now")
- memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout))
-
- finally:
- memory_creation_task_lock = False
+ memory_creation_lock = asyncio.Lock()
+
+ async with memory_creation_lock:
+ if memory_creation_task is not None:
+ memory_creation_task.cancel()
+ try:
+ await memory_creation_task
+ except asyncio.CancelledError:
+ print("memory_creation_task is cancelled now")
+ memory_creation_task = asyncio.create_task(_trigger_create_memory_with_delay(memory_creation_timeout))
…that cause abandoned tasks
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