139 lines
4.9 KiB
TypeScript
139 lines
4.9 KiB
TypeScript
import { INode, INodeData, INodeParams } from '../../../src/Interface'
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import { TextSplitter } from 'langchain/text_splitter'
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import { PlaywrightWebBaseLoader } from 'langchain/document_loaders/web/playwright'
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import { test } from 'linkifyjs'
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import { webCrawl, xmlScrape } from '../../../src'
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class Playwright_DocumentLoaders implements INode {
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label: string
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name: string
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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 = 'Playwright Web Scraper'
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this.name = 'playwrightWebScraper'
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this.type = 'Document'
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this.icon = 'playwright.svg'
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this.category = 'Document Loaders'
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this.description = `Load data from webpages`
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this.baseClasses = [this.type]
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this.inputs = [
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{
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label: 'URL',
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name: 'url',
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type: 'string'
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},
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{
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label: 'Text Splitter',
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name: 'textSplitter',
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type: 'TextSplitter',
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optional: true
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},
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{
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label: 'Get Relative Links Method',
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name: 'relativeLinksMethod',
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type: 'options',
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options: [
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{
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label: 'Web Crawl',
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name: 'webCrawl'
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},
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{
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label: 'Scrape XML Sitemap',
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name: 'scrapeXMLSitemap'
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}
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],
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optional: true,
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additionalParams: true
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},
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{
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label: 'Crawl/Scrape Links Limit',
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name: 'limit',
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type: 'number',
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default: 10,
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optional: true,
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additionalParams: true,
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description: 'Set 0 to crawl/scrape all relative links',
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warning: `Scraping all links might take long time, and all links will be upserted again if the flow's state changed (eg: different URL, chunk size, etc) `
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},
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{
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label: 'Metadata',
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name: 'metadata',
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type: 'json',
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optional: true,
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additionalParams: 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 textSplitter = nodeData.inputs?.textSplitter as TextSplitter
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const metadata = nodeData.inputs?.metadata
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const relativeLinksMethod = nodeData.inputs?.relativeLinksMethod as string
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let limit = nodeData.inputs?.limit as string
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let url = nodeData.inputs?.url as string
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url = url.trim()
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if (!test(url)) {
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throw new Error('Invalid URL')
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}
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async function playwrightLoader(url: string): Promise<any> {
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try {
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let docs = []
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const loader = new PlaywrightWebBaseLoader(url)
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if (textSplitter) {
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docs = await loader.loadAndSplit(textSplitter)
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} else {
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docs = await loader.load()
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}
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return docs
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} catch (err) {
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if (process.env.DEBUG === 'true') console.error(`error in PlaywrightWebBaseLoader: ${err.message}, on page: ${url}`)
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}
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}
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let docs = []
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if (relativeLinksMethod) {
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if (process.env.DEBUG === 'true') console.info(`Start ${relativeLinksMethod}`)
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if (!limit) throw new Error('Please set a limit to crawl/scrape')
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else if (parseInt(limit) < 0) throw new Error('Limit cannot be less than 0')
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const pages: string[] =
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relativeLinksMethod === 'webCrawl' ? await webCrawl(url, parseInt(limit)) : await xmlScrape(url, parseInt(limit))
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if (process.env.DEBUG === 'true') console.info(`pages: ${JSON.stringify(pages)}, length: ${pages.length}`)
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if (!pages || pages.length === 0) throw new Error('No relative links found')
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for (const page of pages) {
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docs.push(...(await playwrightLoader(page)))
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}
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if (process.env.DEBUG === 'true') console.info(`Finish ${relativeLinksMethod}`)
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} else {
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docs = await playwrightLoader(url)
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}
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if (metadata) {
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const parsedMetadata = typeof metadata === 'object' ? metadata : JSON.parse(metadata)
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let finaldocs = []
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for (const doc of docs) {
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const newdoc = {
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...doc,
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metadata: {
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...doc.metadata,
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...parsedMetadata
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}
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}
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finaldocs.push(newdoc)
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}
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return finaldocs
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}
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return docs
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}
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}
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module.exports = { nodeClass: Playwright_DocumentLoaders }
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