init() — langchain Function Reference

Architecture documentation for the __init__() function in entity.py from the langchain codebase.

Function python LangChainCore Runnables

Entity Profile

LangChainCore→ Runnables→ __init__() — langchain Function Reference

Dependency Diagram

graph TD
  15f72ac1_48c7_e4d4_46d0_ef4e3a39c901["__init__()"]
  c539be70_4b09_e675_2ee4_a53dadca5460["RedisEntityStore"]
  15f72ac1_48c7_e4d4_46d0_ef4e3a39c901 -->|defined in| c539be70_4b09_e675_2ee4_a53dadca5460
  style 15f72ac1_48c7_e4d4_46d0_ef4e3a39c901 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/memory/entity.py lines 232–281

    def __init__(
        self,
        session_id: str = "default",
        url: str = "redis://localhost:6379/0",
        key_prefix: str = "memory_store",
        ttl: int | None = 60 * 60 * 24,
        recall_ttl: int | None = 60 * 60 * 24 * 3,
        *args: Any,
        **kwargs: Any,
    ):
        """Initializes the RedisEntityStore.

        Args:
            session_id: Unique identifier for the session.
            url: URL of the Redis server.
            key_prefix: Prefix for keys in the Redis store.
            ttl: Time-to-live for keys in seconds (default 1 day).
            recall_ttl: Time-to-live extension for keys when recalled (default 3 days).
            *args: Additional positional arguments.
            **kwargs: Additional keyword arguments.
        """
        try:
            import redis
        except ImportError as e:
            msg = (
                "Could not import redis python package. "
                "Please install it with `pip install redis`."
            )
            raise ImportError(msg) from e

        super().__init__(*args, **kwargs)

        try:
            from langchain_community.utilities.redis import get_client
        except ImportError as e:
            msg = (
                "Could not import langchain_community.utilities.redis.get_client. "
                "Please install it with `pip install langchain-community`."
            )
            raise ImportError(msg) from e

        try:
            self.redis_client = get_client(redis_url=url, decode_responses=True)
        except redis.exceptions.ConnectionError:
            logger.exception("Redis client could not connect")

        self.session_id = session_id
        self.key_prefix = key_prefix
        self.ttl = ttl
        self.recall_ttl = recall_ttl or ttl