74 lines
2.5 KiB
TypeScript
74 lines
2.5 KiB
TypeScript
import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
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import { getBaseClasses } from '../../../src/utils'
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import { VectorDBQAChain } from 'langchain/chains'
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import { BaseLanguageModel } from 'langchain/base_language'
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import { VectorStore } from 'langchain/vectorstores/base'
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import { ConsoleCallbackHandler, CustomChainHandler, additionalCallbacks } from '../../../src/handler'
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class VectorDBQAChain_Chains implements INode {
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label: string
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name: string
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version: number
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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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description: string
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inputs: INodeParams[]
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constructor() {
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this.label = 'VectorDB QA Chain'
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this.name = 'vectorDBQAChain'
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this.version = 1.0
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this.type = 'VectorDBQAChain'
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this.icon = 'chain.svg'
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this.category = 'Chains'
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this.description = 'QA chain for vector databases'
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this.baseClasses = [this.type, ...getBaseClasses(VectorDBQAChain)]
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this.inputs = [
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{
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label: 'Language Model',
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name: 'model',
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type: 'BaseLanguageModel'
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},
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{
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label: 'Vector Store',
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name: 'vectorStore',
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type: 'VectorStore'
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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 model = nodeData.inputs?.model as BaseLanguageModel
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const vectorStore = nodeData.inputs?.vectorStore as VectorStore
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const chain = VectorDBQAChain.fromLLM(model, vectorStore, {
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k: (vectorStore as any)?.k ?? 4,
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verbose: process.env.DEBUG === 'true' ? true : false
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})
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return chain
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}
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async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
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const chain = nodeData.instance as VectorDBQAChain
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const obj = {
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query: input
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}
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const loggerHandler = new ConsoleCallbackHandler(options.logger)
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const callbacks = await additionalCallbacks(nodeData, options)
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if (options.socketIO && options.socketIOClientId) {
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const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId)
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const res = await chain.call(obj, [loggerHandler, handler, ...callbacks])
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return res?.text
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} else {
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const res = await chain.call(obj, [loggerHandler, ...callbacks])
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return res?.text
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}
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}
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}
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module.exports = { nodeClass: VectorDBQAChain_Chains }
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