Class MomentoChatMessageHistory

A class that stores chat message history using Momento Cache. It interacts with a Momento cache client to perform operations like fetching, adding, and deleting messages.

Example

const chatHistory = await MomentoChatMessageHistory.fromProps({
  client: new CacheClient({
    configuration: Configurations.Laptop.v1(),
    credentialProvider: CredentialProvider.fromEnvironmentVariable({
      environmentVariableName: "MOMENTO_API_KEY",
    }),
    defaultTtlSeconds: 60 * 60 * 24,
  }),
  cacheName: "langchain",
  sessionId: new Date().toISOString(),
  sessionTtl: 300,
});

const messages = await chatHistory.getMessages();
console.log({ messages });

Hierarchy

  • BaseListChatMessageHistory
    • MomentoChatMessageHistory

Methods

addAIChatMessage addAIMessage addMessage addMessages addUserMessage clear getMessages toJSON toJSONNotImplemented fromProps

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>

  • Adds a message to the cache.

    Parameters

    • message: BaseMessage

      The BaseMessage instance to add to the cache.

    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

StaticfromProps

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