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84 lines
2.9 KiB
Python
84 lines
2.9 KiB
Python
import redis
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from redis.connection import Connection, SSLConnection
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from redis.sentinel import Sentinel
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class RedisClientWrapper(redis.Redis):
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"""
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A wrapper class for the Redis client that addresses the issue where the global
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`redis_client` variable cannot be updated when a new Redis instance is returned
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by Sentinel.
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This class allows for deferred initialization of the Redis client, enabling the
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client to be re-initialized with a new instance when necessary. This is particularly
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useful in scenarios where the Redis instance may change dynamically, such as during
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a failover in a Sentinel-managed Redis setup.
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Attributes:
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_client (redis.Redis): The actual Redis client instance. It remains None until
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initialized with the `initialize` method.
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Methods:
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initialize(client): Initializes the Redis client if it hasn't been initialized already.
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__getattr__(item): Delegates attribute access to the Redis client, raising an error
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if the client is not initialized.
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"""
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def __init__(self):
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self._client = None
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def initialize(self, client):
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if self._client is None:
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self._client = client
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def __getattr__(self, item):
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if self._client is None:
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raise RuntimeError("Redis client is not initialized. Call init_app first.")
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return getattr(self._client, item)
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redis_client = RedisClientWrapper()
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def init_app(app):
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global redis_client
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connection_class = Connection
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if app.config.get("REDIS_USE_SSL"):
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connection_class = SSLConnection
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redis_params = {
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"username": app.config.get("REDIS_USERNAME"),
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"password": app.config.get("REDIS_PASSWORD"),
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"db": app.config.get("REDIS_DB"),
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"encoding": "utf-8",
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"encoding_errors": "strict",
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"decode_responses": False,
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}
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if app.config.get("REDIS_USE_SENTINEL"):
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sentinel_hosts = [
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(node.split(":")[0], int(node.split(":")[1])) for node in app.config.get("REDIS_SENTINELS").split(",")
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]
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sentinel = Sentinel(
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sentinel_hosts,
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sentinel_kwargs={
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"socket_timeout": app.config.get("REDIS_SENTINEL_SOCKET_TIMEOUT", 0.1),
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"username": app.config.get("REDIS_SENTINEL_USERNAME"),
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"password": app.config.get("REDIS_SENTINEL_PASSWORD"),
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},
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)
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master = sentinel.master_for(app.config.get("REDIS_SENTINEL_SERVICE_NAME"), **redis_params)
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redis_client.initialize(master)
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else:
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redis_params.update(
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{
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"host": app.config.get("REDIS_HOST"),
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"port": app.config.get("REDIS_PORT"),
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"connection_class": connection_class,
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}
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)
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pool = redis.ConnectionPool(**redis_params)
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redis_client.initialize(redis.Redis(connection_pool=pool))
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app.extensions["redis"] = redis_client
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