mirror of
https://github.com/hwchase17/langchain
synced 2024-11-02 09:40:22 +00:00
96 lines
2.9 KiB
Python
96 lines
2.9 KiB
Python
import asyncio
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import json
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import logging
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from typing import Any, Dict, List, Optional
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from langchain_core.documents import Document
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from langchain_community.document_loaders.base import BaseLoader
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logger = logging.getLogger(__name__)
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class SurrealDBLoader(BaseLoader):
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"""Load SurrealDB documents."""
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def __init__(
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self,
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filter_criteria: Optional[Dict] = None,
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**kwargs: Any,
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) -> None:
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try:
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from surrealdb import Surreal
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except ImportError as e:
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raise ImportError(
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"""Cannot import from surrealdb.
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please install with `pip install surrealdb`."""
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) from e
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self.dburl = kwargs.pop("dburl", "ws://localhost:8000/rpc")
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if self.dburl[0:2] == "ws":
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self.sdb = Surreal(self.dburl)
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else:
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raise ValueError("Only websocket connections are supported at this time.")
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self.filter_criteria = filter_criteria or {}
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if "table" in self.filter_criteria:
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raise ValueError(
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"key `table` is not a valid criteria for `filter_criteria` argument."
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)
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self.ns = kwargs.pop("ns", "langchain")
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self.db = kwargs.pop("db", "database")
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self.table = kwargs.pop("table", "documents")
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self.sdb = Surreal(self.dburl)
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self.kwargs = kwargs
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async def initialize(self) -> None:
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"""
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Initialize connection to surrealdb database
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and authenticate if credentials are provided
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"""
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await self.sdb.connect()
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if "db_user" in self.kwargs and "db_pass" in self.kwargs:
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user = self.kwargs.get("db_user")
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password = self.kwargs.get("db_pass")
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await self.sdb.signin({"user": user, "pass": password})
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await self.sdb.use(self.ns, self.db)
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def load(self) -> List[Document]:
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async def _load() -> List[Document]:
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await self.initialize()
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return await self.aload()
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return asyncio.run(_load())
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async def aload(self) -> List[Document]:
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"""Load data into Document objects."""
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query = "SELECT * FROM type::table($table)"
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if self.filter_criteria is not None and len(self.filter_criteria) > 0:
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query += " WHERE "
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for idx, key in enumerate(self.filter_criteria):
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query += f""" {"AND" if idx > 0 else ""} {key} = ${key}"""
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metadata = {
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"ns": self.ns,
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"db": self.db,
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"table": self.table,
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}
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results = await self.sdb.query(
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query, {"table": self.table, **self.filter_criteria}
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)
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return [
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(
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Document(
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page_content=json.dumps(result),
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metadata={"id": result["id"], **result["metadata"], **metadata},
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)
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)
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for result in results[0]["result"]
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]
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