55 lines
1.4 KiB
Python
55 lines
1.4 KiB
Python
import asyncio
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from typing import Any
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from channels_redis.core import ConnectionPool
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from django.conf import settings
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from . import logging
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logger = logging.getLogger(__name__)
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try:
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import aioredis
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except ImportError:
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use_redis = False
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else:
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# set use_redis to true, if there is a value for REDIS_ADDRESS in the settings
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redis_address = getattr(settings, "REDIS_ADDRESS", "")
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use_redis = bool(redis_address)
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if use_redis:
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logger.info(f"Redis address {redis_address}")
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pool = ConnectionPool({"address": redis_address})
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semaphore = asyncio.Semaphore(100)
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class RedisConnectionContextManager:
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"""
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Async context manager for connections
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"""
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# TODO: contextlib.asynccontextmanager can be used in python 3.7
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async def __aenter__(self) -> "aioredis.RedisConnection":
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await semaphore.acquire()
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self.conn = await pool.pop()
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return self.conn
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async def __aexit__(self, exc_type: Any, exc: Any, tb: Any) -> None:
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if exc:
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logger.warn(f"Redis Exception: {exc}. Do not reuse connection...")
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pool.conn_error(self.conn)
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else:
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pool.push(self.conn)
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self.conn = None
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semaphore.release()
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def get_connection() -> RedisConnectionContextManager:
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"""
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Returns contextmanager for a redis connection.
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"""
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return RedisConnectionContextManager()
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