88 lines
3.1 KiB
TypeScript
88 lines
3.1 KiB
TypeScript
import { z } from 'zod'
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import { DynamicStructuredTool } from '@langchain/core/tools'
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import { CallbackManagerForToolRun } from '@langchain/core/callbacks/manager'
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import { DynamicTool } from '@langchain/core/tools'
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import { BaseRetriever } from '@langchain/core/retrievers'
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import { INode, INodeData, INodeParams } from '../../../src/Interface'
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import { getBaseClasses } from '../../../src/utils'
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import { SOURCE_DOCUMENTS_PREFIX } from '../../../src/agents'
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class Retriever_Tools 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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credential: INodeParams
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inputs: INodeParams[]
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constructor() {
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this.label = 'Retriever Tool'
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this.name = 'retrieverTool'
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this.version = 2.0
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this.type = 'RetrieverTool'
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this.icon = 'retrievertool.svg'
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this.category = 'Tools'
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this.description = 'Use a retriever as allowed tool for agent'
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this.baseClasses = [this.type, 'DynamicTool', ...getBaseClasses(DynamicTool)]
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this.inputs = [
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{
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label: 'Retriever Name',
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name: 'name',
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type: 'string',
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placeholder: 'search_state_of_union'
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},
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{
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label: 'Retriever Description',
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name: 'description',
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type: 'string',
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description: 'When should agent uses to retrieve documents',
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rows: 3,
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placeholder: 'Searches and returns documents regarding the state-of-the-union.'
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},
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{
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label: 'Retriever',
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name: 'retriever',
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type: 'BaseRetriever'
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},
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{
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label: 'Return Source Documents',
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name: 'returnSourceDocuments',
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type: 'boolean',
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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 name = nodeData.inputs?.name as string
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const description = nodeData.inputs?.description as string
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const retriever = nodeData.inputs?.retriever as BaseRetriever
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const returnSourceDocuments = nodeData.inputs?.returnSourceDocuments as boolean
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const input = {
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name,
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description
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}
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const func = async ({ input }: { input: string }, runManager?: CallbackManagerForToolRun) => {
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const docs = await retriever.getRelevantDocuments(input, runManager?.getChild('retriever'))
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const content = docs.map((doc) => doc.pageContent).join('\n\n')
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const sourceDocuments = JSON.stringify(docs)
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return returnSourceDocuments ? content + SOURCE_DOCUMENTS_PREFIX + sourceDocuments : content
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}
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const schema = z.object({
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input: z.string().describe('input to look up in retriever')
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}) as any
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const tool = new DynamicStructuredTool({ ...input, func, schema })
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return tool
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}
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}
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module.exports = { nodeClass: Retriever_Tools }
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