Bugfix/redis connection is closed (#3591)

* Added redis open connection if it is closed

* Removed unecessary modification

* Added check connection in all methods

* Renamed method

* added await on method call

* Refactor Redis connection handling: remove singleton pattern, ensure connections are opened and closed per operation.

---------

Co-authored-by: Maicon Matsubara <maicon@fullwise.com.br>

Author: xmaiconx

packages/components/nodes/memory/RedisBackedChatMemory/RedisBackedChatMemory.ts

@@ -1,7 +1,5 @@
 import { Redis, RedisOptions } from 'ioredis'
-import { isEqual } from 'lodash'
 import { BufferMemory, BufferMemoryInput } from 'langchain/memory'
-import { RedisChatMessageHistory, RedisChatMessageHistoryInput } from '@langchain/community/stores/message/ioredis'
 import { mapStoredMessageToChatMessage, BaseMessage, AIMessage, HumanMessage } from '@langchain/core/messages'
 import { INode, INodeData, INodeParams, ICommonObject, MessageType, IMessage, MemoryMethods, FlowiseMemory } from '../../../src/Interface'
 import {
@@ -12,42 +10,6 @@ import {
     mapChatMessageToBaseMessage
 } from '../../../src/utils'
 
-let redisClientSingleton: Redis
-let redisClientOption: RedisOptions
-let redisClientUrl: string
-
-const getRedisClientbyOption = (option: RedisOptions) => {
-    if (!redisClientSingleton) {
-        // if client doesn't exists
-        redisClientSingleton = new Redis(option)
-        redisClientOption = option
-        return redisClientSingleton
-    } else if (redisClientSingleton && !isEqual(option, redisClientOption)) {
-        // if client exists but option changed
-        redisClientSingleton.quit()
-        redisClientSingleton = new Redis(option)
-        redisClientOption = option
-        return redisClientSingleton
-    }
-    return redisClientSingleton
-}
-
-const getRedisClientbyUrl = (url: string) => {
-    if (!redisClientSingleton) {
-        // if client doesn't exists
-        redisClientSingleton = new Redis(url)
-        redisClientUrl = url
-        return redisClientSingleton
-    } else if (redisClientSingleton && url !== redisClientUrl) {
-        // if client exists but option changed
-        redisClientSingleton.quit()
-        redisClientSingleton = new Redis(url)
-        redisClientUrl = url
-        return redisClientSingleton
-    }
-    return redisClientSingleton
-}
-
 class RedisBackedChatMemory_Memory implements INode {
     label: string
     name: string
@@ -114,11 +76,11 @@ class RedisBackedChatMemory_Memory implements INode {
     }
 
     async init(nodeData: INodeData, _: string, options: ICommonObject): Promise<any> {
-        return await initalizeRedis(nodeData, options)
+        return await initializeRedis(nodeData, options)
     }
 }
 
-const initalizeRedis = async (nodeData: INodeData, options: ICommonObject): Promise<BufferMemory> => {
+const initializeRedis = async (nodeData: INodeData, options: ICommonObject): Promise<BufferMemory> => {
     const sessionTTL = nodeData.inputs?.sessionTTL as number
     const memoryKey = nodeData.inputs?.memoryKey as string
     const sessionId = nodeData.inputs?.sessionId as string
@@ -127,120 +89,102 @@ const initalizeRedis = async (nodeData: INodeData, options: ICommonObject): Prom
     const credentialData = await getCredentialData(nodeData.credential ?? '', options)
     const redisUrl = getCredentialParam('redisUrl', credentialData, nodeData)
 
-    let client: Redis
-
-    if (!redisUrl || redisUrl === '') {
-        const username = getCredentialParam('redisCacheUser', credentialData, nodeData)
-        const password = getCredentialParam('redisCachePwd', credentialData, nodeData)
-        const portStr = getCredentialParam('redisCachePort', credentialData, nodeData)
-        const host = getCredentialParam('redisCacheHost', credentialData, nodeData)
-        const sslEnabled = getCredentialParam('redisCacheSslEnabled', credentialData, nodeData)
-
-        const tlsOptions = sslEnabled === true ? { tls: { rejectUnauthorized: false } } : {}
-
-        client = getRedisClientbyOption({
-            port: portStr ? parseInt(portStr) : 6379,
-            host,
-            username,
-            password,
-            ...tlsOptions
-        })
-    } else {
-        client = getRedisClientbyUrl(redisUrl)
-    }
-
-    let obj: RedisChatMessageHistoryInput = {
-        sessionId,
-        client
-    }
-
-    if (sessionTTL) {
-        obj = {
-            ...obj,
-            sessionTTL
-        }
-    }
-
-    const redisChatMessageHistory = new RedisChatMessageHistory(obj)
+    const redisOptions = redisUrl
+        ? redisUrl
+        : ({
+              port: parseInt(getCredentialParam('redisCachePort', credentialData, nodeData) || '6379'),
+              host: getCredentialParam('redisCacheHost', credentialData, nodeData),
+              username: getCredentialParam('redisCacheUser', credentialData, nodeData),
+              password: getCredentialParam('redisCachePwd', credentialData, nodeData),
+              tls: getCredentialParam('redisCacheSslEnabled', credentialData, nodeData) ? { rejectUnauthorized: false } : undefined
+          } as RedisOptions)
 
     const memory = new BufferMemoryExtended({
         memoryKey: memoryKey ?? 'chat_history',
-        chatHistory: redisChatMessageHistory,
         sessionId,
         windowSize,
-        redisClient: client,
-        sessionTTL
+        sessionTTL,
+        redisOptions
     })
 
     return memory
 }
 
 interface BufferMemoryExtendedInput {
-    redisClient: Redis
     sessionId: string
     windowSize?: number
     sessionTTL?: number
+    redisOptions: RedisOptions | string
 }
 
 class BufferMemoryExtended extends FlowiseMemory implements MemoryMethods {
     sessionId = ''
-    redisClient: Redis
     windowSize?: number
     sessionTTL?: number
+    redisOptions: RedisOptions | string
 
     constructor(fields: BufferMemoryInput & BufferMemoryExtendedInput) {
         super(fields)
         this.sessionId = fields.sessionId
-        this.redisClient = fields.redisClient
         this.windowSize = fields.windowSize
         this.sessionTTL = fields.sessionTTL
+        this.redisOptions = fields.redisOptions
+    }
+
+    private async withRedisClient<T>(fn: (client: Redis) => Promise<T>): Promise<T> {
+        const client = typeof this.redisOptions === 'string' ? new Redis(this.redisOptions) : new Redis(this.redisOptions)
+        try {
+            return await fn(client)
+        } finally {
+            await client.quit()
+        }
     }
 
     async getChatMessages(
         overrideSessionId = '',
         returnBaseMessages = false,
         prependMessages?: IMessage[]
     ): Promise<IMessage[] | BaseMessage[]> {
-        if (!this.redisClient) return []
-
-        const id = overrideSessionId ? overrideSessionId : this.sessionId
-        const rawStoredMessages = await this.redisClient.lrange(id, this.windowSize ? this.windowSize * -1 : 0, -1)
-        const orderedMessages = rawStoredMessages.reverse().map((message) => JSON.parse(message))
-        const baseMessages = orderedMessages.map(mapStoredMessageToChatMessage)
-        if (prependMessages?.length) {
-            baseMessages.unshift(...(await mapChatMessageToBaseMessage(prependMessages)))
-        }
-        return returnBaseMessages ? baseMessages : convertBaseMessagetoIMessage(baseMessages)
+        return this.withRedisClient(async (client) => {
+            const id = overrideSessionId ? overrideSessionId : this.sessionId
+            const rawStoredMessages = await client.lrange(id, this.windowSize ? this.windowSize * -1 : 0, -1)
+            const orderedMessages = rawStoredMessages.reverse().map((message) => JSON.parse(message))
+            const baseMessages = orderedMessages.map(mapStoredMessageToChatMessage)
+            if (prependMessages?.length) {
+                baseMessages.unshift(...(await mapChatMessageToBaseMessage(prependMessages)))
+            }
+            return returnBaseMessages ? baseMessages : convertBaseMessagetoIMessage(baseMessages)
+        })
     }
 
     async addChatMessages(msgArray: { text: string; type: MessageType }[], overrideSessionId = ''): Promise<void> {
-        if (!this.redisClient) return
-
-        const id = overrideSessionId ? overrideSessionId : this.sessionId
-        const input = msgArray.find((msg) => msg.type === 'userMessage')
-        const output = msgArray.find((msg) => msg.type === 'apiMessage')
-
-        if (input) {
-            const newInputMessage = new HumanMessage(input.text)
-            const messageToAdd = [newInputMessage].map((msg) => msg.toDict())
-            await this.redisClient.lpush(id, JSON.stringify(messageToAdd[0]))
-            if (this.sessionTTL) await this.redisClient.expire(id, this.sessionTTL)
-        }
+        await this.withRedisClient(async (client) => {
+            const id = overrideSessionId ? overrideSessionId : this.sessionId
+            const input = msgArray.find((msg) => msg.type === 'userMessage')
+            const output = msgArray.find((msg) => msg.type === 'apiMessage')
+
+            if (input) {
+                const newInputMessage = new HumanMessage(input.text)
+                const messageToAdd = [newInputMessage].map((msg) => msg.toDict())
+                await client.lpush(id, JSON.stringify(messageToAdd[0]))
+                if (this.sessionTTL) await client.expire(id, this.sessionTTL)
+            }
 
-        if (output) {
-            const newOutputMessage = new AIMessage(output.text)
-            const messageToAdd = [newOutputMessage].map((msg) => msg.toDict())
-            await this.redisClient.lpush(id, JSON.stringify(messageToAdd[0]))
-            if (this.sessionTTL) await this.redisClient.expire(id, this.sessionTTL)
-        }
+            if (output) {
+                const newOutputMessage = new AIMessage(output.text)
+                const messageToAdd = [newOutputMessage].map((msg) => msg.toDict())
+                await client.lpush(id, JSON.stringify(messageToAdd[0]))
+                if (this.sessionTTL) await client.expire(id, this.sessionTTL)
+            }
+        })
     }
 
     async clearChatMessages(overrideSessionId = ''): Promise<void> {
-        if (!this.redisClient) return
-
-        const id = overrideSessionId ? overrideSessionId : this.sessionId
-        await this.redisClient.del(id)
-        await this.clear()
+        await this.withRedisClient(async (client) => {
+            const id = overrideSessionId ? overrideSessionId : this.sessionId
+            await client.del(id)
+            await this.clear()
+        })
     }
 }