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⚡ Implement Redis Chat Memory, update LC
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packages/@n8n/nodes-langchain/nodes/llms/LMOpenAi/LmOpenAi.node.ts
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packages/@n8n/nodes-langchain/nodes/memory/MemoryRedisChat/MemoryRedisChat.node.ts
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,111 @@ | ||
| /* eslint-disable n8n-nodes-base/node-dirname-against-convention */ | ||
| import { | ||
| NodeOperationError, | ||
| type IExecuteFunctions, | ||
| type INodeType, | ||
| type INodeTypeDescription, | ||
| type SupplyData, | ||
| } from 'n8n-workflow'; | ||
| import { BufferMemory } from 'langchain/memory'; | ||
| import type { RedisChatMessageHistoryInput } from 'langchain/stores/message/redis'; | ||
| import { RedisChatMessageHistory } from 'langchain/stores/message/redis'; | ||
| import type { RedisClientOptions } from 'redis'; | ||
| import { createClient } from 'redis'; | ||
| import { logWrapper } from '../../../utils/logWrapper'; | ||
|
|
||
| export class MemoryRedisChat implements INodeType { | ||
| description: INodeTypeDescription = { | ||
| displayName: 'Redis Chat Memory', | ||
| name: 'memoryRedisChat', | ||
| icon: 'file:redis.svg', | ||
| group: ['transform'], | ||
| version: 1, | ||
| description: 'Stores the chat history in Redis.', | ||
| defaults: { | ||
| name: 'Redis Chat Memory', | ||
| }, | ||
| credentials: [ | ||
| { | ||
| name: 'redis', | ||
| required: true, | ||
| }, | ||
| ], | ||
| codex: { | ||
| categories: ['AI'], | ||
| subcategories: { | ||
| AI: ['Memory'], | ||
| }, | ||
| }, | ||
| // eslint-disable-next-line n8n-nodes-base/node-class-description-inputs-wrong-regular-node | ||
| inputs: [], | ||
| // eslint-disable-next-line n8n-nodes-base/node-class-description-outputs-wrong | ||
| outputs: ['memory'], | ||
| outputNames: ['Memory'], | ||
| properties: [ | ||
| { | ||
| displayName: 'Session Key', | ||
| name: 'sessionKey', | ||
| type: 'string', | ||
| default: 'chat_history', | ||
| description: 'The key to use to store the memory in the workflow data', | ||
| }, | ||
| { | ||
| displayName: 'Session Time To Live', | ||
| name: 'sessionTTL', | ||
| type: 'number', | ||
| default: 0, | ||
| description: | ||
| 'For how long the session should be stored in seconds. If set to 0 it will not expire.', | ||
| }, | ||
| ], | ||
| }; | ||
|
|
||
| async supplyData(this: IExecuteFunctions): Promise<SupplyData> { | ||
| const credentials = await this.getCredentials('redis'); | ||
| const sessionKey = this.getNodeParameter('sessionKey', 0) as string; | ||
| const sessionTTL = this.getNodeParameter('sessionTTL', 0, 0) as number; | ||
|
|
||
| const redisOptions: RedisClientOptions = { | ||
| socket: { | ||
| host: credentials.host as string, | ||
| port: credentials.port as number, | ||
| }, | ||
| database: credentials.database as number, | ||
| }; | ||
|
|
||
| if (credentials.password) { | ||
| redisOptions.password = credentials.password as string; | ||
| } | ||
|
|
||
| const client = createClient({ | ||
| ...redisOptions, | ||
| }); | ||
|
|
||
| client.on('error', async (error: Error) => { | ||
| await client.quit(); | ||
| throw new NodeOperationError(this.getNode(), 'Redis Error: ' + error.message); | ||
| }); | ||
|
|
||
| const redisChatConfig: RedisChatMessageHistoryInput = { | ||
| client, | ||
| sessionId: sessionKey, | ||
| }; | ||
|
|
||
| if (sessionTTL > 0) { | ||
| redisChatConfig.sessionTTL = sessionTTL; | ||
| } | ||
| const redisChatHistory = new RedisChatMessageHistory(redisChatConfig); | ||
|
|
||
| const memory = new BufferMemory({ | ||
| memoryKey: 'chat_history', | ||
| chatHistory: redisChatHistory, | ||
| returnMessages: true, | ||
| inputKey: 'input', | ||
| outputKey: 'output', | ||
| }); | ||
|
|
||
| return { | ||
| response: logWrapper(memory, this), | ||
| }; | ||
| } | ||
| } |
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packages/@n8n/nodes-langchain/nodes/memory/MemoryRedisChat/redis.svg
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