95 lines
3.2 KiB
TypeScript
95 lines
3.2 KiB
TypeScript
import { FlowiseWindowMemory, IMessage, INode, INodeData, INodeParams, MemoryMethods } from '../../../src/Interface'
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import { convertBaseMessagetoIMessage, getBaseClasses } from '../../../src/utils'
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import { BufferWindowMemory, BufferWindowMemoryInput } from 'langchain/memory'
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import { BaseMessage } from 'langchain/schema'
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class BufferWindowMemory_Memory implements INode {
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label: string
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name: string
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version: number
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description: string
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type: string
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icon: string
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category: string
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baseClasses: string[]
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inputs: INodeParams[]
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constructor() {
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this.label = 'Buffer Window Memory'
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this.name = 'bufferWindowMemory'
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this.version = 1.0
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this.type = 'BufferWindowMemory'
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this.icon = 'memory.svg'
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this.category = 'Memory'
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this.description = 'Uses a window of size k to surface the last k back-and-forth to use as memory'
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this.baseClasses = [this.type, ...getBaseClasses(BufferWindowMemory)]
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this.inputs = [
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{
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label: 'Memory Key',
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name: 'memoryKey',
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type: 'string',
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default: 'chat_history'
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},
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{
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label: 'Input Key',
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name: 'inputKey',
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type: 'string',
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default: 'input'
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},
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{
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label: 'Size',
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name: 'k',
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type: 'number',
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default: '4',
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description: 'Window of size k to surface the last k back-and-forth to use as memory.'
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}
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]
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}
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async init(nodeData: INodeData): Promise<any> {
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const memoryKey = nodeData.inputs?.memoryKey as string
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const inputKey = nodeData.inputs?.inputKey as string
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const k = nodeData.inputs?.k as string
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const obj: Partial<BufferWindowMemoryInput> = {
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returnMessages: true,
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memoryKey: memoryKey,
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inputKey: inputKey,
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k: parseInt(k, 10)
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}
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return new BufferWindowMemoryExtended(obj)
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}
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}
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class BufferWindowMemoryExtended extends FlowiseWindowMemory implements MemoryMethods {
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constructor(fields: BufferWindowMemoryInput) {
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super(fields)
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}
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async getChatMessages(_?: string, returnBaseMessages = false, prevHistory: IMessage[] = []): Promise<IMessage[] | BaseMessage[]> {
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await this.chatHistory.clear()
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// Insert into chatHistory
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for (const msg of prevHistory) {
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if (msg.type === 'userMessage') await this.chatHistory.addUserMessage(msg.message)
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else if (msg.type === 'apiMessage') await this.chatHistory.addAIChatMessage(msg.message)
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}
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const memoryResult = await this.loadMemoryVariables({})
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const baseMessages = memoryResult[this.memoryKey ?? 'chat_history']
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return returnBaseMessages ? baseMessages : convertBaseMessagetoIMessage(baseMessages)
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}
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async addChatMessages(): Promise<void> {
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// adding chat messages will be done on the fly in getChatMessages()
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return
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}
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async clearChatMessages(): Promise<void> {
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await this.clear()
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}
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}
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module.exports = { nodeClass: BufferWindowMemory_Memory }
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