'NoneType' object has no attribute 'execute_command'

[shuyingz]

Version: What redis-py and what redis version is the issue happening on?
redis==4.3.0

Platform: What platform / version?
python 3.8 on MacBook Pro (13-inch, M1, 2020)

Description: Description of your issue, stack traces from errors and code that reproduces the issue

Hello I am facing an issue when I am playing with the RedisCluster class which is in redis.asyncio (not the regular RedisCluster one).

For creating my connection, I just created a very simple one -

self.redis = redis.RedisCluster(host=self.url, encoding='utf-8')

In my project, the first get func to my redis always errors out with AttributeError: 'NoneType' object has no attribute 'execute_command', and then if I hit my service a second call, my service will be working fine..

It seems like the initialize function in parser.py gets a None in the r value. Not sure if I missed any required arguments to avoid this error or it's a bug. Can someone plz help? Thanks!

Here's my Traceback logs:

[2023-01-11 17:40:21] [ERROR] Traceback (most recent call last):
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/parser.py", line 52, in get_keys
    command = self.commands[args[0]]
KeyError: 'GET'

During handling of the above exception, another exception occurred:
....
  File "/Users/.../redis.py", line 43, in get
    res = await self.redis.get(name=key)
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/cluster.py", line 618, in execute_command
    raise e
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/cluster.py", line 580, in execute_command
    target_nodes = await self._determine_nodes(
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/cluster.py", line 460, in _determine_nodes
    await self._determine_slot(*args),
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/cluster.py", line 491, in _determine_slot
    keys = await self.commands_parser.get_keys(
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/parser.py", line 61, in get_keys
    await self.initialize(redis_conn)
  File "/Users/.../lib/python3.8/site-packages/redis/asyncio/parser.py", line 31, in initialize
    commands = await r.execute_command("COMMAND")
AttributeError: 'NoneType' object has no attribute 'execute_command'

[shacharPash]

Hi @shuyingz, thanks for submitting this issue!
I tried to reproduce your problem but my code did not throw an error.
I used redis==4.3.0, and ran the following code:

import asyncio
import redis.asyncio.cluster as redis

async def run_cluster():
    r = redis.RedisCluster(host="localhost", port=16379, encoding="utf-8")
    print("!!!!!!!!!!!!!!!!!!!!!!!!")
    print(await r.get("a"))

async def main():
    asyncio.ensure_future(run_cluster())

loop = asyncio.get_event_loop()
loop.run_until_complete(main())

For me, the get command passed without sending an error.
Can you perhaps send more details or tell me what I did differently from you so that I can understand why an error is thrown in your case?

Another thing, there was a change in parser.py code,
I recommend you look at PR #2205 and see if the changes in this PR solve your problem.

[dvora-h]

No response for 6 months, closing.