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https://github.com/hwchase17/langchain
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9da1e0cf34
## **Description** Migrate the `MongoDBChatMessageHistory` to the managed `langchain-mongodb` partner-package ## **Dependencies** None ## **Twitter handle** @mongodb ## **tests and docs** - [x] Migrate existing integration test - [x ]~ Convert existing integration test to a unit test~ Creation is out of scope for this ticket - [x ] ~Considering delaying work until #17470 merges to leverage the `MockCollection` object. ~ - [x] **Lint and test**: Run `make format`, `make lint` and `make test` from the root of the package(s) you've modified. See contribution guidelines for more: https://python.langchain.com/docs/contributing/ --------- Co-authored-by: Erick Friis <erick@langchain.dev>
85 lines
2.6 KiB
Python
85 lines
2.6 KiB
Python
import json
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import logging
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from typing import List
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from langchain_core.chat_history import BaseChatMessageHistory
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from langchain_core.messages import (
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BaseMessage,
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message_to_dict,
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messages_from_dict,
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)
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from pymongo import MongoClient, errors
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logger = logging.getLogger(__name__)
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DEFAULT_DBNAME = "chat_history"
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DEFAULT_COLLECTION_NAME = "message_store"
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class MongoDBChatMessageHistory(BaseChatMessageHistory):
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"""Chat message history that stores history in MongoDB.
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Args:
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connection_string: connection string to connect to MongoDB
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session_id: arbitrary key that is used to store the messages
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of a single chat session.
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database_name: name of the database to use
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collection_name: name of the collection to use
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"""
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def __init__(
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self,
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connection_string: str,
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session_id: str,
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database_name: str = DEFAULT_DBNAME,
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collection_name: str = DEFAULT_COLLECTION_NAME,
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):
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self.connection_string = connection_string
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self.session_id = session_id
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self.database_name = database_name
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self.collection_name = collection_name
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try:
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self.client: MongoClient = MongoClient(connection_string)
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except errors.ConnectionFailure as error:
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logger.error(error)
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self.db = self.client[database_name]
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self.collection = self.db[collection_name]
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self.collection.create_index("SessionId")
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@property
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def messages(self) -> List[BaseMessage]: # type: ignore
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"""Retrieve the messages from MongoDB"""
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try:
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cursor = self.collection.find({"SessionId": self.session_id})
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except errors.OperationFailure as error:
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logger.error(error)
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if cursor:
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items = [json.loads(document["History"]) for document in cursor]
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else:
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items = []
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messages = messages_from_dict(items)
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return messages
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def add_message(self, message: BaseMessage) -> None:
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"""Append the message to the record in MongoDB"""
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try:
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self.collection.insert_one(
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{
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"SessionId": self.session_id,
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"History": json.dumps(message_to_dict(message)),
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}
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)
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except errors.WriteError as err:
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logger.error(err)
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def clear(self) -> None:
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"""Clear session memory from MongoDB"""
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try:
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self.collection.delete_many({"SessionId": self.session_id})
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except errors.WriteError as err:
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logger.error(err)
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