feature/SupportZepMemoryAndAutoSummary

packages/components/nodes/memory/ZepMemory/ZepMemory.ts

@@ -0,0 +1,140 @@
+import { SystemChatMessage } from 'langchain/schema'
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+import { ZepMemory, ZepMemoryInput } from 'langchain/memory/zep'
+import { ICommonObject } from '../../../src'
+
+class ZepMemory_Memory implements INode {
+    label: string
+    name: string
+    description: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Zep Memory'
+        this.name = 'ZepMemory'
+        this.type = 'ZepMemory'
+        this.icon = 'memory.svg'
+        this.category = 'Memory'
+        this.description = 'Summarizes the conversation and stores the memory in zep server'
+        this.baseClasses = [this.type, ...getBaseClasses(ZepMemory)]
+        this.inputs = [
+            {
+                label: 'Base URL',
+                name: 'baseURL',
+                type: 'string',
+                default: 'http://127.0.0.1:8000'
+            },
+            {
+                label: 'Auto Summary',
+                name: 'autoSummary',
+                type: 'boolean',
+                default: true
+            },
+            {
+                label: 'Session Id',
+                name: 'sessionId',
+                type: 'string',
+                description: 'if empty, chatId will be used automatically',
+                default: '',
+                additionalParams: true
+            },
+            {
+                label: 'Auto Summary Template',
+                name: 'autoSummaryTemplate',
+                type: 'string',
+                default: 'This is the summary of the following conversation:\n{summary}',
+                additionalParams: true
+            },
+            {
+                label: 'AI Prefix',
+                name: 'aiPrefix',
+                type: 'string',
+                default: 'ai',
+                additionalParams: true
+            },
+            {
+                label: 'Human Prefix',
+                name: 'humanPrefix',
+                type: 'string',
+                default: 'human',
+                additionalParams: true
+            },
+            {
+                label: 'Memory Key',
+                name: 'memoryKey',
+                type: 'string',
+                default: 'chat_history',
+                additionalParams: true
+            },
+            {
+                label: 'Input Key',
+                name: 'inputKey',
+                type: 'string',
+                default: 'input',
+                additionalParams: true
+            },
+            {
+                label: 'Output Key',
+                name: 'outputKey',
+                type: 'string',
+                default: 'text',
+                additionalParams: true
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
+        const baseURL = nodeData.inputs?.baseURL as string
+        const aiPrefix = nodeData.inputs?.aiPrefix as string
+        const humanPrefix = nodeData.inputs?.humanPrefix as string
+        const memoryKey = nodeData.inputs?.memoryKey as string
+        const inputKey = nodeData.inputs?.inputKey as string
+        const autoSummaryTemplate = nodeData.inputs?.autoSummaryTemplate as string
+        const autoSummary = nodeData.inputs?.autoSummary as boolean
+        const sessionId = nodeData.inputs?.sessionId as string
+
+        const chatId = options?.chatId as string
+
+        const obj: ZepMemoryInput = {
+            baseURL,
+            sessionId: sessionId ? sessionId : chatId,
+            aiPrefix,
+            humanPrefix,
+            returnMessages: true,
+            memoryKey,
+            inputKey
+        }
+
+        let zep = new ZepMemory(obj)
+
+        // hack to support summary
+        let tmpFunc = zep.loadMemoryVariables
+        zep.loadMemoryVariables = async (values) => {
+            let data = await tmpFunc.bind(zep, values)()
+            if (autoSummary && zep.returnMessages && data[zep.memoryKey] && data[zep.memoryKey].length) {
+                const memory = await zep.zepClient.getMemory(zep.sessionId, 10)
+                if (memory?.summary) {
+                    let summary = autoSummaryTemplate.replace(/{summary}/g, memory.summary.content)
+                    // eslint-disable-next-line no-console
+                    console.log('[ZepMemory] auto summary:', summary)
+                    data[zep.memoryKey].unshift(new SystemChatMessage(summary))
+                }
+            }
+            // for langchain zep memory compatibility, or we will get "Missing value for input variable chat_history"
+            if (data instanceof Array) {
+                data = {
+                    [zep.memoryKey]: data
+                }
+            }
+            return data
+        }
+        return zep
+    }
+}
+
+module.exports = { nodeClass: ZepMemory_Memory }

packages/components/package.json

@@ -17,6 +17,7 @@
     "license": "SEE LICENSE IN LICENSE.md",
     "dependencies": {
         "@dqbd/tiktoken": "^1.0.7",
+        "@getzep/zep-js": "^0.3.1",
         "@huggingface/inference": "1",
         "@pinecone-database/pinecone": "^0.0.12",
         "@supabase/supabase-js": "^2.21.0",

packages/server/src/ChildProcess.ts

@@ -23,7 +23,7 @@ export class ChildProcess {
         await sendToParentProcess('start', '_')
 
         // Create a Queue and add our initial node in it
-        const { endingNodeData, chatflow, incomingInput, componentNodes } = messageValue
+        const { endingNodeData, chatflow, chatId, incomingInput, componentNodes } = messageValue
 
         let nodeToExecuteData: INodeData
         let addToChatFlowPool: any = {}
@@ -83,6 +83,7 @@ export class ChildProcess {
                 depthQueue,
                 componentNodes,
                 incomingInput.question,
+                chatId,
                 incomingInput?.overrideConfig
             )
 

packages/server/src/Interface.ts

@@ -143,6 +143,7 @@ export interface IDatabaseExport {
 
 export interface IRunChatflowMessageValue {
     chatflow: IChatFlow
+    chatId: string
     incomingInput: IncomingInput
     componentNodes: IComponentNodes
     endingNodeData?: INodeData

packages/server/src/index.ts

@@ -432,7 +432,7 @@ export class App {
      * @param {IncomingInput} incomingInput
      * @param {INodeData} endingNodeData
      */
-    async startChildProcess(chatflow: ChatFlow, incomingInput: IncomingInput, endingNodeData?: INodeData) {
+    async startChildProcess(chatflow: ChatFlow, chatId: string, incomingInput: IncomingInput, endingNodeData?: INodeData) {
         try {
             const controller = new AbortController()
             const { signal } = controller
@@ -444,6 +444,7 @@ export class App {
 
             const value = {
                 chatflow,
+                chatId,
                 incomingInput,
                 componentNodes: cloneDeep(this.nodesPool.componentNodes),
                 endingNodeData
@@ -506,6 +507,9 @@ export class App {
             })
             if (!chatflow) return res.status(404).send(`Chatflow ${chatflowid} not found`)
 
+            const chatId = await getChatId(chatflow.id)
+            if (!chatId) return res.status(500).send(`Chatflow ${chatflowid} first message not found`)
+
             if (!isInternal) {
                 await this.validateKey(req, res, chatflow)
             }
@@ -557,15 +561,15 @@ export class App {
                 if (isRebuildNeeded()) {
                     nodeToExecuteData = this.chatflowPool.activeChatflows[chatflowid].endingNodeData
                     try {
-                        const result = await this.startChildProcess(chatflow, incomingInput, nodeToExecuteData)
+                        const result = await this.startChildProcess(chatflow, chatId, incomingInput, nodeToExecuteData)
 
                         return res.json(result)
                     } catch (error) {
                         return res.status(500).send(error)
                     }
                 } else {
                     try {
-                        const result = await this.startChildProcess(chatflow, incomingInput)
+                        const result = await this.startChildProcess(chatflow, chatId, incomingInput)
                         return res.json(result)
                     } catch (error) {
                         return res.status(500).send(error)
@@ -618,6 +622,7 @@ export class App {
                         depthQueue,
                         this.nodesPool.componentNodes,
                         incomingInput.question,
+                        chatId,
                         incomingInput?.overrideConfig
                     )
 
@@ -661,6 +666,23 @@ export class App {
     }
 }
 
+/**
+ * Get first chat message id
+ * @param {string} chatflowid
+ * @returns {string}
+ */
+export async function getChatId(chatflowid: string) {
+    // first chatmessage id as the unique chat id
+    const firstChatMessage = await getDataSource()
+        .getRepository(ChatMessage)
+        .createQueryBuilder('cm')
+        .select('cm.id')
+        .where('chatflowid = :chatflowid', { chatflowid })
+        .orderBy('cm.createdDate', 'ASC')
+        .getOne()
+    return firstChatMessage ? firstChatMessage.id : ''
+}
+
 let serverApp: App | undefined
 
 export async function start(): Promise<void> {

packages/server/src/utils/index.ts

@@ -182,6 +182,7 @@ export const buildLangchain = async (
     depthQueue: IDepthQueue,
     componentNodes: IComponentNodes,
     question: string,
+    chatId: string,
     overrideConfig?: ICommonObject
 ) => {
     const flowNodes = cloneDeep(reactFlowNodes)
@@ -214,7 +215,7 @@ export const buildLangchain = async (
             if (overrideConfig) flowNodeData = replaceInputsWithConfig(flowNodeData, overrideConfig)
             const reactFlowNodeData: INodeData = resolveVariables(flowNodeData, flowNodes, question)
 
-            flowNodes[nodeIndex].data.instance = await newNodeInstance.init(reactFlowNodeData, question)
+            flowNodes[nodeIndex].data.instance = await newNodeInstance.init(reactFlowNodeData, question, { chatId })
         } catch (e: any) {
             console.error(e)
             throw new Error(e)

packages/ui/src/views/chatmessage/ChatMessage.js

@@ -118,7 +118,8 @@ export const ChatMessage = ({ open, chatflowid, isDialog }) => {
 
         setLoading(true)
         setMessages((prevMessages) => [...prevMessages, { message: userInput, type: 'userMessage' }])
-        addChatMessage(userInput, 'userMessage')
+        // waiting for first chatmessage saved, the first chatmessage will be used in sendMessageAndGetPrediction
+        await addChatMessage(userInput, 'userMessage')
 
         // Send user question and history to API
         try {