langchain.memory.chat_message_histories.dynamodb.DynamoDBChatMessageHistory

class langchain.memory.chat_message_histories.dynamodb.DynamoDBChatMessageHistory(table_name: str, session_id: str, endpoint_url: Optional[str] = None)

Bases: BaseChatMessageHistory

Chat message history that stores history in AWS DynamoDB.

This class expects that a DynamoDB table with name table_name and a partition Key of SessionId is present.

Parameters

• table_name – name of the DynamoDB table

• session_id – arbitrary key that is used to store the messages of a single chat session.

• endpoint_url – URL of the AWS endpoint to connect to. This argument is optional and useful for test purposes, like using Localstack. If you plan to use AWS cloud service, you normally don’t have to worry about setting the endpoint_url.

Methods

__init__(table_name, session_id[, endpoint_url])
add_ai_message(message)	Convenience method for adding an AI message string to the store.
add_message(message)	Append the message to the record in DynamoDB
add_user_message(message)	Convenience method for adding a human message string to the store.
clear()	Clear session memory from DynamoDB

Attributes

messages

Retrieve the messages from DynamoDB

add_ai_message(message: str) → None

Convenience method for adding an AI message string to the store.

Parameters

message – The string contents of an AI message.

add_message(message: BaseMessage) → None

Append the message to the record in DynamoDB

add_user_message(message: str) → None

Convenience method for adding a human message string to the store.

Parameters

message – The string contents of a human message.

clear() → None

Clear session memory from DynamoDB

property messages: List[langchain.schema.messages.BaseMessage]

Retrieve the messages from DynamoDB

Examples using DynamoDBChatMessageHistory

• Dynamodb Chat Message History