From 0fb1d8a1ff056e1462954d396b40c6a70dbf8b07 Mon Sep 17 00:00:00 2001
From: ivalkshfoeif <linsichen2018@gmail.com>
Date: Fri, 23 Jun 2023 17:57:36 -0700
Subject: [PATCH] add redis-backed chat memory

---
 .../RedisBackedChatMemory.ts                  | 85 +++++++++++++++++++
 .../memory/RedisBackedChatMemory/memory.svg   |  8 ++
 packages/components/package.json              |  1 +
 3 files changed, 94 insertions(+)
 create mode 100644 packages/components/nodes/memory/RedisBackedChatMemory/RedisBackedChatMemory.ts
 create mode 100644 packages/components/nodes/memory/RedisBackedChatMemory/memory.svg

diff --git a/packages/components/nodes/memory/RedisBackedChatMemory/RedisBackedChatMemory.ts b/packages/components/nodes/memory/RedisBackedChatMemory/RedisBackedChatMemory.ts
new file mode 100644
index 00000000..155ea5f5
--- /dev/null
+++ b/packages/components/nodes/memory/RedisBackedChatMemory/RedisBackedChatMemory.ts
@@ -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 }
diff --git a/packages/components/nodes/memory/RedisBackedChatMemory/memory.svg b/packages/components/nodes/memory/RedisBackedChatMemory/memory.svg
new file mode 100644
index 00000000..ca8e17da
--- /dev/null
+++ b/packages/components/nodes/memory/RedisBackedChatMemory/memory.svg
@@ -0,0 +1,8 @@
+<svg xmlns="http://www.w3.org/2000/svg" class="icon icon-tabler icon-tabler-book" width="24" height="24" viewBox="0 0 24 24" stroke-width="2" stroke="currentColor" fill="none" stroke-linecap="round" stroke-linejoin="round">
+   <path stroke="none" d="M0 0h24v24H0z" fill="none"></path>
+   <path d="M3 19a9 9 0 0 1 9 0a9 9 0 0 1 9 0"></path>
+   <path d="M3 6a9 9 0 0 1 9 0a9 9 0 0 1 9 0"></path>
+   <path d="M3 6l0 13"></path>
+   <path d="M12 6l0 13"></path>
+   <path d="M21 6l0 13"></path>
+</svg>
\ No newline at end of file
diff --git a/packages/components/package.json b/packages/components/package.json
index e5e0ba00..12210951 100644
--- a/packages/components/package.json
+++ b/packages/components/package.json
@@ -42,6 +42,7 @@
         "pdfjs-dist": "^3.7.107",
         "playwright": "^1.35.0",
         "puppeteer": "^20.7.1",
+        "redis": "^4.6.7",
         "srt-parser-2": "^1.2.3",
         "vm2": "^3.9.19",
         "weaviate-ts-client": "^1.1.0",