add redis-backed chat memory

2026-06-28 15:00:57 +03:00 · 2023-06-23 17:57:36 -07:00
parent 160aa87aba
commit 0fb1d8a1ff
3 changed files with 94 additions and 0 deletions
@@ -0,0 +1,85 @@
+import { INode, INodeData, INodeParams } from '../../../src/Interface'
+import { getBaseClasses } from '../../../src/utils'
+import { ICommonObject } from '../../../src'
+import { BufferMemory } from 'langchain/memory'
+import { RedisChatMessageHistory, RedisChatMessageHistoryInput } from 'langchain/stores/message/redis'
+import { createClient } from 'redis'
+
+class RedisBackedChatMemory_Memory implements INode {
+    label: string
+    name: string
+    description: string
+    type: string
+    icon: string
+    category: string
+    baseClasses: string[]
+    inputs: INodeParams[]
+
+    constructor() {
+        this.label = 'Redis-Backed Chat Memory'
+        this.name = 'RedisBackedChatMemory'
+        this.type = 'RedisBackedChatMemory'
+        this.icon = 'memory.svg'
+        this.category = 'Memory'
+        this.description = 'Summarizes the conversation and stores the memory in Redis server'
+        this.baseClasses = [this.type, ...getBaseClasses(BufferMemory)]
+        this.inputs = [
+            {
+                label: 'Base URL',
+                name: 'baseURL',
+                type: 'string',
+                default: 'redis://localhost:6379'
+            },
+            {
+                label: 'Session Id',
+                name: 'sessionId',
+                type: 'string',
+                description: 'if empty, chatId will be used automatically',
+                default: '',
+                additionalParams: true
+            },
+            {
+                label: 'Session Timeouts',
+                name: 'sessionTTL',
+                type: 'number',
+                description: 'Omit this parameter to make sessions never expire',
+                optional: true
+            },
+            {
+                label: 'Memory Key',
+                name: 'memoryKey',
+                type: 'string',
+                default: 'chat_history'
+            }
+        ]
+    }
+
+    async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
+        const baseURL = nodeData.inputs?.baseURL as string
+        const sessionId = nodeData.inputs?.sessionId as string
+        const sessionTTL = nodeData.inputs?.sessionTTL as number
+        const memoryKey = nodeData.inputs?.memoryKey as string
+
+        const chatId = options?.chatId as string
+
+        const redisClient = createClient({ url: baseURL })
+        let obj: RedisChatMessageHistoryInput = {
+            sessionId: sessionId ? sessionId : chatId,
+            client: redisClient
+        }
+
+        if (sessionTTL) {
+            obj = {
+                ...obj,
+                sessionTTL
+            }
+        }
+
+        let redisChatMessageHistory = new RedisChatMessageHistory(obj)
+        let redis = new BufferMemory({ memoryKey, chatHistory: redisChatMessageHistory, returnMessages: true })
+
+        return redis
+    }
+}
+
+module.exports = { nodeClass: RedisBackedChatMemory_Memory }