Class CloudflareD1MessageHistory

Class for storing and retrieving chat message history from a Cloudflare D1 database. Extends the BaseListChatMessageHistory class.

Example

const memory = new BufferMemory({
  returnMessages: true,
  chatHistory: new CloudflareD1MessageHistory({
    tableName: "stored_message",
    sessionId: "example",
    database: env.DB,
  }),
});

const chainInput = { input };

const res = await memory.chatHistory.invoke(chainInput);
await memory.saveContext(chainInput, {
  output: res,
});

Hierarchy

BaseListChatMessageHistory
- CloudflareD1MessageHistory

Index

Constructors

constructor

new CloudflareD1MessageHistory(fields): CloudflareD1MessageHistory
Parameters
- fields: CloudflareD1MessageHistoryInput
Returns CloudflareD1MessageHistory
Overrides BaseListChatMessageHistory.constructor
- Defined in libs/langchain-cloudflare/src/message_histories.ts:68

Properties

database

database: D1Database

Methods

addAIChatMessage

addAIChatMessage(message): Promise<void>
Parameters
- message: string
Returns Promise<void>
Inherited from BaseListChatMessageHistory.addAIChatMessage
- Defined in langchain-core/dist/chat_history.d.ts:21

addMessage

addMessage(message): Promise<void>
Method to add a new message to the Cloudflare D1 database for the current session.
Parameters
- message: BaseMessage
  
  The BaseMessage object to be added to the database.
Returns Promise<void>
Promise that resolves to void.
Overrides BaseListChatMessageHistory.addMessage
- Defined in libs/langchain-cloudflare/src/message_histories.ts:156

addUserMessage

addUserMessage(message): Promise<void>
Parameters
- message: string
Returns Promise<void>
Inherited from BaseListChatMessageHistory.addUserMessage
- Defined in langchain-core/dist/chat_history.d.ts:20

clear

clear(): Promise<void>
Method to delete all messages from the Cloudflare D1 database for the current session.

Returns Promise<void>
Promise that resolves to void.
- Defined in libs/langchain-cloudflare/src/message_histories.ts:184

getMessages

getMessages(): Promise<BaseMessage[]>
Method to retrieve all messages from the Cloudflare D1 database for the current session.

Returns Promise<BaseMessage[]>
Promise that resolves to an array of BaseMessage objects.
Overrides BaseListChatMessageHistory.getMessages
- Defined in libs/langchain-cloudflare/src/message_histories.ts:114

toJSON

toJSON(): Serialized
Returns Serialized
Inherited from BaseListChatMessageHistory.toJSON
- Defined in langchain-core/dist/load/serializable.d.ts:64

toJSONNotImplemented

toJSONNotImplemented(): SerializedNotImplemented
Returns SerializedNotImplemented
Inherited from BaseListChatMessageHistory.toJSONNotImplemented
- Defined in langchain-core/dist/load/serializable.d.ts:65

Class CloudflareD1MessageHistory

Example

Hierarchy

Index

Constructors

Properties

Methods

Constructors

constructor

Parameters

fields: CloudflareD1MessageHistoryInput

Returns CloudflareD1MessageHistory

Properties

database

Methods

addAIChatMessage

Parameters

message: string

Returns Promise<void>

addMessage

Parameters

message: BaseMessage

Returns Promise<void>

addUserMessage

Parameters

message: string

Returns Promise<void>

clear

Returns Promise<void>

getMessages

Returns Promise<BaseMessage[]>

toJSON

Returns Serialized

toJSONNotImplemented

Returns SerializedNotImplemented

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