exception raised when trying to use client-side caching on an environment where hiredis is installed

[kevin-lee-dialpad]

There is a bug in CacheProxyConnection that throws an exception when attempted to use client-side caching on an environment where hiredis is installed, and the issue is still present in v6.0.0 that just got released.

traceback:

"/Users/kevinlee/Desktop/projects/firespotter_v2/venv3.11/lib/python3.11/site-packages/redis/connection.py", line 994, in _enable_tracking_callback
    conn._parser.set_invalidation_push_handler(self._on_invalidation_callback)
    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: '_HiredisParser' object has no attribute 'set_invalidation_push_handler'

it's basically expecting a _RESP3Parser but redis-py ends up setting _HiredisParser instead when hiredis is available.

workaround for now is obviously to avoid installing hiredis when using client-side caching, but we want it fixed because we'd like to maintain 2 separate connection pools, 1 with client-side caching enabled and the other without.

[petyaslavova]

Hi @kevin-lee-dialpad , thank you for pointing this out! We'll have a look at this.