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- [ ] Title: Mongodb: MongoDB connection performance improvement.
- [ ] Message:
- **Description:** I made collection index_creation as optional. Index
Creation is one time process.
- **Issue:** MongoDBChatMessageHistory class object is attempting to
create an index during connection, causing each request to take longer
than usual. This should be optional with a parameter.
- **Dependencies:** N/A
- **Branch to be checked:** origin/mongo_index_creation
---------
Co-authored-by: Bagatur <baskaryan@gmail.com>
102 lines
3.0 KiB
Python
102 lines
3.0 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._api.deprecation import deprecated
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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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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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@deprecated(
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since="0.0.25",
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removal="0.2.0",
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alternative_import="langchain_mongodb.MongoDBChatMessageHistory",
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)
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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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create_index: whether to create an index with name SessionId. Set to False if
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such an index already exists.
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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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create_index: bool = True,
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):
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from pymongo import MongoClient, errors
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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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if create_index:
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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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from pymongo import errors
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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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from pymongo import errors
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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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from pymongo import errors
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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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