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Add support for older redis versions #47

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Add support for older redis versions #47

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328548c
Add support for older redis versions
petrubabalau Oct 25, 2022
4606664
Revert poetry lock
petrubabalau Oct 25, 2022
0f51571
Use pipeline.expire()
petrubabalau Oct 25, 2022
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16 changes: 15 additions & 1 deletion asyncio_redis_rate_limit/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -84,6 +84,10 @@ async def __aexit__(
) -> None:
"""Do nothing. We need this to ``__aenter__`` to work."""

async def redis_version(self):
version = await self._backend.info(section='SERVER')
return version['redis_version']

# Private API:

async def _acquire(self) -> None:
Expand All @@ -95,7 +99,17 @@ async def _acquire(self) -> None:
pipeline = self._backend.pipeline()

async with self._lock:
current_rate = await self._run_pipeline(cache_key, pipeline)
redis_version = await self.redis_version()
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@sobolevn sobolevn Oct 25, 2022

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Can we do this earlier? We don't need to query this every time. We only need this once per app.


if int(redis_version.split('.')[0]) < 7:
current_rate, *_ = await pipeline.incr(cache_key).execute()
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@sobolevn sobolevn Oct 25, 2022

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It feels like you execute a pipeline twice. This might not be safe due to race conditions.

if current_rate == 1:
await pipeline.expire(
cache_key,
self._rate_spec.seconds
).execute()
else:
current_rate = await self._run_pipeline(cache_key, pipeline)
# This looks like a coverage error on 3.10:
if current_rate > self._rate_spec.requests: # pragma: no cover
raise RateLimitError('Rate limit is hit', current_rate)
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