89 lines
3.1 KiB
TypeScript
89 lines
3.1 KiB
TypeScript
import { ICommonObject, INode, INodeData, INodeParams } from '../../../src/Interface'
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import { APIChain } from 'langchain/chains'
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import { CustomChainHandler, getBaseClasses } from '../../../src/utils'
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import { BaseLanguageModel } from 'langchain/base_language'
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import { Document } from 'langchain/document'
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import { PromptTemplate } from 'langchain/prompts'
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class ApiChain_Chains implements INode {
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label: string
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name: 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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description: string
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inputs: INodeParams[]
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constructor() {
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this.label = 'API Chain'
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this.name = 'apiChain'
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this.type = 'ApiChain'
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this.icon = 'apichain.svg'
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this.category = 'Chains'
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this.description = 'Chain to run queries against API'
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this.baseClasses = [this.type, ...getBaseClasses(APIChain)]
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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: 'Document',
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name: 'document',
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type: 'Document'
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},
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{
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label: 'Headers',
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name: 'headers',
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type: 'json',
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additionalParams: true,
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optional: true
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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 docs = nodeData.inputs?.document as Document[]
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const headers = nodeData.inputs?.headers as string
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const chain = await getAPIChain(docs, model, headers)
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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 model = nodeData.inputs?.model as BaseLanguageModel
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const docs = nodeData.inputs?.document as Document[]
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const headers = nodeData.inputs?.headers as string
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const chain = await getAPIChain(docs, model, headers)
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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.run(input, [handler])
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return res
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} else {
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const res = await chain.run(input)
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return res
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}
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}
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}
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const getAPIChain = async (documents: Document[], llm: BaseLanguageModel, headers: any) => {
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const texts = documents.map(({ pageContent }) => pageContent)
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const apiResponsePrompt = new PromptTemplate({
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inputVariables: ['api_docs', 'question', 'api_url', 'api_response'],
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template: 'Given this {api_response} response for {api_url}. use the given response to answer this {question}'
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})
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const chain = APIChain.fromLLMAndAPIDocs(llm, texts.toString(), {
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apiResponsePrompt,
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verbose: process.env.DEBUG === 'true' ? true : false,
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headers: typeof headers === 'object' ? headers : headers ? JSON.parse(headers) : {}
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})
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return chain
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}
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module.exports = { nodeClass: ApiChain_Chains }
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