docs/langchain/libs/community/langchain_community/indexes/base.py

from __future__ import annotations

import uuid
from abc import ABC, abstractmethod
from typing import List, Optional, Sequence

NAMESPACE_UUID = uuid.UUID(int=1984)


class RecordManager(ABC):
    """Abstract base class for a record manager."""

    def __init__(
        self,
        namespace: str,
    ) -> None:
        """Initialize the record manager.

        Args:
            namespace (str): The namespace for the record manager.
        """
        self.namespace = namespace

    @abstractmethod
    def create_schema(self) -> None:
        """Create the database schema for the record manager."""

    @abstractmethod
    async def acreate_schema(self) -> None:
        """Create the database schema for the record manager."""

    @abstractmethod
    def get_time(self) -> float:
        """Get the current server time as a high resolution timestamp!

        It's important to get this from the server to ensure a monotonic clock,
        otherwise there may be data loss when cleaning up old documents!

        Returns:
            The current server time as a float timestamp.
        """

    @abstractmethod
    async def aget_time(self) -> float:
        """Get the current server time as a high resolution timestamp!

        It's important to get this from the server to ensure a monotonic clock,
        otherwise there may be data loss when cleaning up old documents!

        Returns:
            The current server time as a float timestamp.
        """

    @abstractmethod
    def update(
        self,
        keys: Sequence[str],
        *,
        group_ids: Optional[Sequence[Optional[str]]] = None,
        time_at_least: Optional[float] = None,
    ) -> None:
        """Upsert records into the database.

        Args:
            keys: A list of record keys to upsert.
            group_ids: A list of group IDs corresponding to the keys.
            time_at_least: if provided, updates should only happen if the
              updated_at field is at least this time.

        Raises:
            ValueError: If the length of keys doesn't match the length of group_ids.
        """

    @abstractmethod
    async def aupdate(
        self,
        keys: Sequence[str],
        *,
        group_ids: Optional[Sequence[Optional[str]]] = None,
        time_at_least: Optional[float] = None,
    ) -> None:
        """Upsert records into the database.

        Args:
            keys: A list of record keys to upsert.
            group_ids: A list of group IDs corresponding to the keys.
            time_at_least: if provided, updates should only happen if the
              updated_at field is at least this time.

        Raises:
            ValueError: If the length of keys doesn't match the length of group_ids.
        """

    @abstractmethod
    def exists(self, keys: Sequence[str]) -> List[bool]:
        """Check if the provided keys exist in the database.

        Args:
            keys: A list of keys to check.

        Returns:
            A list of boolean values indicating the existence of each key.
        """

    @abstractmethod
    async def aexists(self, keys: Sequence[str]) -> List[bool]:
        """Check if the provided keys exist in the database.

        Args:
            keys: A list of keys to check.

        Returns:
            A list of boolean values indicating the existence of each key.
        """

    @abstractmethod
    def list_keys(
        self,
        *,
        before: Optional[float] = None,
        after: Optional[float] = None,
        group_ids: Optional[Sequence[str]] = None,
        limit: Optional[int] = None,
    ) -> List[str]:
        """List records in the database based on the provided filters.

        Args:
            before: Filter to list records updated before this time.
            after: Filter to list records updated after this time.
            group_ids: Filter to list records with specific group IDs.
            limit: optional limit on the number of records to return.

        Returns:
            A list of keys for the matching records.
        """

    @abstractmethod
    async def alist_keys(
        self,
        *,
        before: Optional[float] = None,
        after: Optional[float] = None,
        group_ids: Optional[Sequence[str]] = None,
        limit: Optional[int] = None,
    ) -> List[str]:
        """List records in the database based on the provided filters.

        Args:
            before: Filter to list records updated before this time.
            after: Filter to list records updated after this time.
            group_ids: Filter to list records with specific group IDs.
            limit: optional limit on the number of records to return.

        Returns:
            A list of keys for the matching records.
        """

    @abstractmethod
    def delete_keys(self, keys: Sequence[str]) -> None:
        """Delete specified records from the database.

        Args:
            keys: A list of keys to delete.
        """

    @abstractmethod
    async def adelete_keys(self, keys: Sequence[str]) -> None:
        """Delete specified records from the database.

        Args:
            keys: A list of keys to delete.
        """