56 lines
2 KiB
JavaScript
56 lines
2 KiB
JavaScript
import { ObjectId } from "mongodb";
|
|
import { BaseListChatMessageHistory } from "@langchain/core/chat_history";
|
|
import { mapChatMessagesToStoredMessages, mapStoredMessagesToChatMessages, } from "@langchain/core/messages";
|
|
/**
|
|
* @deprecated Install and import from the "@langchain/mongodb" integration package instead.
|
|
* @example
|
|
* ```typescript
|
|
* const chatHistory = new MongoDBChatMessageHistory({
|
|
* collection: myCollection,
|
|
* sessionId: 'unique-session-id',
|
|
* });
|
|
* const messages = await chatHistory.getMessages();
|
|
* await chatHistory.clear();
|
|
* ```
|
|
*/
|
|
export class MongoDBChatMessageHistory extends BaseListChatMessageHistory {
|
|
constructor({ collection, sessionId }) {
|
|
super();
|
|
Object.defineProperty(this, "lc_namespace", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: ["langchain", "stores", "message", "mongodb"]
|
|
});
|
|
Object.defineProperty(this, "collection", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: void 0
|
|
});
|
|
Object.defineProperty(this, "sessionId", {
|
|
enumerable: true,
|
|
configurable: true,
|
|
writable: true,
|
|
value: void 0
|
|
});
|
|
this.collection = collection;
|
|
this.sessionId = sessionId;
|
|
}
|
|
async getMessages() {
|
|
const document = await this.collection.findOne({
|
|
_id: new ObjectId(this.sessionId),
|
|
});
|
|
const messages = document?.messages || [];
|
|
return mapStoredMessagesToChatMessages(messages);
|
|
}
|
|
async addMessage(message) {
|
|
const messages = mapChatMessagesToStoredMessages([message]);
|
|
await this.collection.updateOne({ _id: new ObjectId(this.sessionId) }, {
|
|
$push: { messages: { $each: messages } },
|
|
}, { upsert: true });
|
|
}
|
|
async clear() {
|
|
await this.collection.deleteOne({ _id: new ObjectId(this.sessionId) });
|
|
}
|
|
}
|