129 lines
4.8 KiB
TypeScript
129 lines
4.8 KiB
TypeScript
import { INode, INodeData, INodeParams } from '../../../src/Interface'
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import { getBaseClasses, getCredentialData, getCredentialParam, serializeChatHistory } from '../../../src/utils'
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import { ICommonObject } from '../../../src'
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import { BufferMemory, BufferMemoryInput } from 'langchain/memory'
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import { UpstashRedisChatMessageHistory } from 'langchain/stores/message/upstash_redis'
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class UpstashRedisBackedChatMemory_Memory implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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credential: INodeParams
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inputs: INodeParams[]
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constructor() {
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this.label = 'Upstash Redis-Backed Chat Memory'
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this.name = 'upstashRedisBackedChatMemory'
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this.version = 1.0
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this.type = 'UpstashRedisBackedChatMemory'
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this.icon = 'upstash.svg'
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this.category = 'Memory'
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this.description = 'Summarizes the conversation and stores the memory in Upstash Redis server'
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this.baseClasses = [this.type, ...getBaseClasses(BufferMemory)]
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this.credential = {
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label: 'Connect Credential',
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name: 'credential',
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type: 'credential',
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description: 'Configure password authentication on your upstash redis instance',
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credentialNames: ['upstashRedisMemoryApi']
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}
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this.inputs = [
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{
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label: 'Upstash Redis REST URL',
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name: 'baseURL',
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type: 'string',
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placeholder: 'https://<your-url>.upstash.io'
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},
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{
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label: 'Session Id',
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name: 'sessionId',
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type: 'string',
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description: 'If not specified, the first CHAT_MESSAGE_ID will be used as sessionId',
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default: '',
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additionalParams: true,
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optional: true
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},
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{
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label: 'Session Timeouts',
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name: 'sessionTTL',
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type: 'number',
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description: 'Omit this parameter to make sessions never expire',
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additionalParams: true,
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optional: true
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}
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]
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}
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async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
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return initalizeUpstashRedis(nodeData, options)
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}
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//@ts-ignore
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memoryMethods = {
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async clearSessionMemory(nodeData: INodeData, options: ICommonObject): Promise<void> {
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const redis = await initalizeUpstashRedis(nodeData, options)
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const sessionId = nodeData.inputs?.sessionId as string
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const chatId = options?.chatId as string
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options.logger.info(`Clearing Upstash Redis memory session ${sessionId ? sessionId : chatId}`)
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await redis.clear()
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options.logger.info(`Successfully cleared Upstash Redis memory session ${sessionId ? sessionId : chatId}`)
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},
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async getChatMessages(nodeData: INodeData, options: ICommonObject): Promise<string> {
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const redis = await initalizeUpstashRedis(nodeData, options)
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const key = 'chat_history'
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const memoryResult = await redis.loadMemoryVariables({})
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return serializeChatHistory(memoryResult[key])
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}
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}
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}
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const initalizeUpstashRedis = async (nodeData: INodeData, options: ICommonObject): Promise<BufferMemory> => {
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const baseURL = nodeData.inputs?.baseURL as string
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const sessionId = nodeData.inputs?.sessionId as string
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const sessionTTL = nodeData.inputs?.sessionTTL as string
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const chatId = options?.chatId as string
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let isSessionIdUsingChatMessageId = false
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if (!sessionId && chatId) isSessionIdUsingChatMessageId = true
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const credentialData = await getCredentialData(nodeData.credential ?? '', options)
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const upstashRestToken = getCredentialParam('upstashRestToken', credentialData, nodeData)
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const redisChatMessageHistory = new UpstashRedisChatMessageHistory({
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sessionId: sessionId ? sessionId : chatId,
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sessionTTL: sessionTTL ? parseInt(sessionTTL, 10) : undefined,
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config: {
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url: baseURL,
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token: upstashRestToken
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}
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})
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const memory = new BufferMemoryExtended({
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memoryKey: 'chat_history',
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chatHistory: redisChatMessageHistory,
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isSessionIdUsingChatMessageId
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})
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return memory
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}
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interface BufferMemoryExtendedInput {
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isSessionIdUsingChatMessageId: boolean
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}
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class BufferMemoryExtended extends BufferMemory {
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isSessionIdUsingChatMessageId? = false
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constructor(fields: BufferMemoryInput & Partial<BufferMemoryExtendedInput>) {
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super(fields)
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this.isSessionIdUsingChatMessageId = fields.isSessionIdUsingChatMessageId
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}
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}
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module.exports = { nodeClass: UpstashRedisBackedChatMemory_Memory }
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