inflight
Deduplicate concurrent async requests by query_key. When multiple identical coroutines are in-flight, only one executes — the rest wait for and receive the same result.
Why
In high-concurrency environments, identical queries (same DB row, same cache key) accumulate while each one independently hits the database or cache. inflight collapses these into a single call.
Install
pip install inflight
Usage
import json
from inflight import InFlight
class Repo:
def __init__(self, db, cache):
self.db = db
self.cache = cache
self._inflight = InFlight()
async def get_user(self, user_id: int):
cached = await self._inflight.execute(
f"user:{user_id}:cache",
lambda: self.cache.get(f"user:{user_id}"),
)
if cached:
return json.loads(cached)
result = await self._inflight.execute(
f"user:{user_id}:db",
lambda: self.db.execute(
select(users).where(users.c.id == user_id)
),
)
await self.cache.set(f"user:{user_id}", json.dumps(result), ex=5)
return result
Benchmarks
See benchmarks/README.md for performance comparison with and without inflight.
License
GPL-3.0-only
1 maintainer
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