init() — langchain Function Reference

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

Function python LangChainCore ApiManagement

Entity Profile

LangChainCore→ ApiManagement→ __init__() — langchain Function Reference

Dependency Diagram

graph TD
  d11783a0_d6d8_0a95_fa5a_83d372212579["__init__()"]
  65c1d19b_b721_7b61_7b71_c0d54a3a49e7["UpstashRedisEntityStore"]
  d11783a0_d6d8_0a95_fa5a_83d372212579 -->|defined in| 65c1d19b_b721_7b61_7b71_c0d54a3a49e7
  style d11783a0_d6d8_0a95_fa5a_83d372212579 fill:#6366f1,stroke:#818cf8,color:#fff

Relationship Graph

Source Code

libs/langchain/langchain_classic/memory/entity.py lines 111–155

    def __init__(
        self,
        session_id: str = "default",
        url: str = "",
        token: str = "",
        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.
            token: Authentication token for 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:
            from upstash_redis import Redis
        except ImportError as e:
            msg = (
                "Could not import upstash_redis python package. "
                "Please install it with `pip install upstash_redis`."
            )
            raise ImportError(msg) from e

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

        try:
            self.redis_client = Redis(url=url, token=token)
        except Exception as exc:
            error_msg = "Upstash Redis instance could not be initiated"
            logger.exception(error_msg)
            raise RuntimeError(error_msg) from exc

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