mirror of
https://github.com/hwchase17/langchain
synced 2024-11-16 06:13:16 +00:00
f2a7dda4bd
Co-authored-by: Bagatur <baskaryan@gmail.com> Co-authored-by: Bagatur <22008038+baskaryan@users.noreply.github.com>
125 lines
4.5 KiB
Python
125 lines
4.5 KiB
Python
from __future__ import annotations
|
|
|
|
import json
|
|
import logging
|
|
from typing import (
|
|
TYPE_CHECKING,
|
|
Any,
|
|
AsyncIterator,
|
|
Callable,
|
|
Dict,
|
|
Iterator,
|
|
List,
|
|
Optional,
|
|
)
|
|
|
|
from langchain_core._api.deprecation import deprecated
|
|
from langchain_core.documents import Document
|
|
|
|
from langchain_community.document_loaders.base import BaseLoader
|
|
from langchain_community.utilities.astradb import _AstraDBEnvironment
|
|
|
|
if TYPE_CHECKING:
|
|
from astrapy.db import AstraDB, AsyncAstraDB
|
|
|
|
logger = logging.getLogger(__name__)
|
|
|
|
|
|
@deprecated(
|
|
since="0.0.29",
|
|
removal="0.2.0",
|
|
alternative_import="langchain_astradb.AstraDBLoader",
|
|
)
|
|
class AstraDBLoader(BaseLoader):
|
|
def __init__(
|
|
self,
|
|
collection_name: str,
|
|
*,
|
|
token: Optional[str] = None,
|
|
api_endpoint: Optional[str] = None,
|
|
astra_db_client: Optional[AstraDB] = None,
|
|
async_astra_db_client: Optional[AsyncAstraDB] = None,
|
|
namespace: Optional[str] = None,
|
|
filter_criteria: Optional[Dict[str, Any]] = None,
|
|
projection: Optional[Dict[str, Any]] = None,
|
|
find_options: Optional[Dict[str, Any]] = None,
|
|
nb_prefetched: int = 1000,
|
|
extraction_function: Callable[[Dict], str] = json.dumps,
|
|
) -> None:
|
|
"""Load DataStax Astra DB documents.
|
|
|
|
Args:
|
|
collection_name: name of the Astra DB collection to use.
|
|
token: API token for Astra DB usage.
|
|
api_endpoint: full URL to the API endpoint,
|
|
such as `https://<DB-ID>-us-east1.apps.astra.datastax.com`.
|
|
astra_db_client: *alternative to token+api_endpoint*,
|
|
you can pass an already-created 'astrapy.db.AstraDB' instance.
|
|
async_astra_db_client: *alternative to token+api_endpoint*,
|
|
you can pass an already-created 'astrapy.db.AsyncAstraDB' instance.
|
|
namespace: namespace (aka keyspace) where the
|
|
collection is. Defaults to the database's "default namespace".
|
|
filter_criteria: Criteria to filter documents.
|
|
projection: Specifies the fields to return.
|
|
find_options: Additional options for the query.
|
|
nb_prefetched: Max number of documents to pre-fetch. Defaults to 1000.
|
|
extraction_function: Function applied to collection documents to create
|
|
the `page_content` of the LangChain Document. Defaults to `json.dumps`.
|
|
"""
|
|
astra_env = _AstraDBEnvironment(
|
|
token=token,
|
|
api_endpoint=api_endpoint,
|
|
astra_db_client=astra_db_client,
|
|
async_astra_db_client=async_astra_db_client,
|
|
namespace=namespace,
|
|
)
|
|
self.astra_env = astra_env
|
|
self.collection = astra_env.astra_db.collection(collection_name)
|
|
self.collection_name = collection_name
|
|
self.filter = filter_criteria
|
|
self.projection = projection
|
|
self.find_options = find_options or {}
|
|
self.nb_prefetched = nb_prefetched
|
|
self.extraction_function = extraction_function
|
|
|
|
def lazy_load(self) -> Iterator[Document]:
|
|
for doc in self.collection.paginated_find(
|
|
filter=self.filter,
|
|
options=self.find_options,
|
|
projection=self.projection,
|
|
sort=None,
|
|
prefetched=self.nb_prefetched,
|
|
):
|
|
yield Document(
|
|
page_content=self.extraction_function(doc),
|
|
metadata={
|
|
"namespace": self.collection.astra_db.namespace,
|
|
"api_endpoint": self.collection.astra_db.base_url,
|
|
"collection": self.collection_name,
|
|
},
|
|
)
|
|
|
|
async def aload(self) -> List[Document]:
|
|
"""Load data into Document objects."""
|
|
return [doc async for doc in self.alazy_load()]
|
|
|
|
async def alazy_load(self) -> AsyncIterator[Document]:
|
|
async_collection = await self.astra_env.async_astra_db.collection(
|
|
self.collection_name
|
|
)
|
|
async for doc in async_collection.paginated_find(
|
|
filter=self.filter,
|
|
options=self.find_options,
|
|
projection=self.projection,
|
|
sort=None,
|
|
prefetched=self.nb_prefetched,
|
|
):
|
|
yield Document(
|
|
page_content=self.extraction_function(doc),
|
|
metadata={
|
|
"namespace": async_collection.astra_db.namespace,
|
|
"api_endpoint": async_collection.astra_db.base_url,
|
|
"collection": self.collection_name,
|
|
},
|
|
)
|