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import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
import { RetrievalQAChain } from 'langchain/chains'
import { BaseRetriever } from 'langchain/schema'
import { CustomChainHandler, getBaseClasses } from '../../../src/utils'
import { BaseLanguageModel } from 'langchain/base_language'
class RetrievalQAChain_Chains implements INode {
label: string
name: string
type: string
icon: string
category: string
baseClasses: string[]
description: string
inputs: INodeParams[]
constructor() {
this.label = 'Retrieval QA Chain'
this.name = 'retrievalQAChain'
this.type = 'RetrievalQAChain'
this.icon = 'chain.svg'
this.category = 'Chains'
this.description = 'QA chain to answer a question based on the retrieved documents'
this.baseClasses = [this.type, ...getBaseClasses(RetrievalQAChain)]
this.inputs = [
{
label: 'Language Model',
name: 'model',
type: 'BaseLanguageModel'
},
{
label: 'Vector Store Retriever',
name: 'vectorStoreRetriever',
type: 'BaseRetriever'
}
]
}
async init(nodeData: INodeData): Promise<any> {
const model = nodeData.inputs?.model as BaseLanguageModel
const vectorStoreRetriever = nodeData.inputs?.vectorStoreRetriever as BaseRetriever
const chain = RetrievalQAChain.fromLLM(model, vectorStoreRetriever, { verbose: process.env.DEBUG === 'true' ? true : false })
return chain
}
async run(nodeData: INodeData, input: string, options: ICommonObject): Promise<string> {
const chain = nodeData.instance as RetrievalQAChain
const obj = {
query: input
}
if (options.socketIO && options.socketIOClientId) {
const handler = new CustomChainHandler(options.socketIO, options.socketIOClientId)
const res = await chain.call(obj, [handler])
return res?.text
} else {
const res = await chain.call(obj)
return res?.text
}
}
}
module.exports = { nodeClass: RetrievalQAChain_Chains }
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