Class CassandraChatMessageHistory

Class for storing chat message history within Cassandra. It extends the BaseListChatMessageHistory class and provides methods to get, add, and clear messages.

Example

const chatHistory = new CassandraChatMessageHistory({
  cloud: {
    secureConnectBundle: "<path to your secure bundle>",
  },
  credentials: {
    username: "token",
    password: "<your Cassandra access token>",
  },
  keyspace: "langchain",
  table: "message_history",
  sessionId: "<some unique session identifier>",
});

const chain = new ConversationChain({
  llm: new ChatOpenAI(),
  memory: chatHistory,
});

const response = await chain.invoke({
  input: "What did I just say my name was?",
});
console.log({ response });

Hierarchy

  • BaseListChatMessageHistory
    • CassandraChatMessageHistory

Constructors

constructor

Methods

addAIChatMessage addAIMessage addMessage addMessages addUserMessage clear getMessages toJSON toJSONNotImplemented

Constructors

constructor

Methods

addAIChatMessage

  • addAIChatMessage(message): Promise<void>

  • Parameters

    • message: string

    Returns Promise<void>

    Deprecated

    Use addAIMessage instead

addAIMessage

  • addAIMessage(message): Promise<void>

  • This is a convenience method for adding an AI message string to the store. Please note that this is a convenience method. Code should favor the bulk addMessages interface instead to save on round-trips to the underlying persistence layer. This method may be deprecated in a future release.

    Parameters

    • message: string

    Returns Promise<void>

addMessage

  • addMessage(message): Promise<void>

  • Method to add a new message to the Cassandra database.

    Parameters

    • message: BaseMessage

      The BaseMessage instance to add.

    Returns Promise<void>

    A promise that resolves when the message has been added.

addMessages

  • addMessages(messages): Promise<void>

  • Add a list of messages.

    Implementations should override this method to handle bulk addition of messages in an efficient manner to avoid unnecessary round-trips to the underlying store.

    Parameters

    • messages: BaseMessage[]

      A list of BaseMessage objects to store.

    Returns Promise<void>

addUserMessage

  • addUserMessage(message): Promise<void>

  • This is a convenience method for adding a human message string to the store. Please note that this is a convenience method. Code should favor the bulk addMessages interface instead to save on round-trips to the underlying persistence layer. This method may be deprecated in a future release.

    Parameters

    • message: string

    Returns Promise<void>

clear

getMessages

toJSON

  • toJSON(): Serialized

  • Returns Serialized

toJSONNotImplemented

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