🚀 New issue to ag2ai/faststream by @GrigoriyKuzevanov
📝 Bug: min_idle_time ignored when group and consumer are specified (#2678)


Describe the bug
When a StreamSub has both 'group' and 'consumer', and 'min_idle_time' specified, Faststream uses 'XREADGROUP' instead of 'XAUTOCALIM'

How to reproduce
Include source code:

from faststream import FastStream
from faststream.redis import RedisBroker, StreamSub

broker = RedisBroker("redis://localhost:6379")

@broker.subscriber(
    stream=StreamSub(
        "orders",
        group="processors",
        consumer="claimer",
        min_idle_time=10000,  # Should trigger XAUTOCLAIM
    )
)
async def claiming_handler(msg):
    print("Should use XAUTOCLAIM, but uses XREADGROUP")


app = FastStream(broker)

Redis MONITOR output shows:

XREADGROUP GROUP processors claimer BLOCK 100 STREAMS orders >

Expected behavior

XAUTOCLAIM orders processors claimer 10000 0-0 COUNT 1

Observed behavior
I suppose that a root cause in faststream/redis/subscriber/use_cases/stream_subscriber, method _StreamHandlerMixin.start():

if stream.group and stream.consumer:  # ← Checked FIRST
    # Uses XREADGROUP
    ...
elif self.stream_sub.min_idle_time is None:
    # Uses XREAD
    ...
else:
    # Uses XAUTOCLAIM ← Never reached when group is set!
    ...

Or i just misunderstand the logic.

Environment
Running FastStream 0.6.3 with CPython 3.12.3 on Linux


#bug #good_first_issue #faststream #ag2ai
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