Initial commit
This commit is contained in:
Nicolas
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import { Document } from "../../lib/entities";
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import { Progress } from "../../lib/entities";
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import { scrapSingleUrl } from "./single_url";
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import { SitemapEntry, fetchSitemapData, getLinksFromSitemap } from "./sitemap";
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import { WebCrawler } from "./crawler";
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import { getValue, setValue } from "../../services/redis";
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export type WebScraperOptions = {
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urls: string[];
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mode: "single_urls" | "sitemap" | "crawl";
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crawlerOptions?: {
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returnOnlyUrls?: boolean;
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includes?: string[];
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excludes?: string[];
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maxCrawledLinks?: number;
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limit?: number;
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};
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concurrentRequests?: number;
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};
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export class WebScraperDataProvider {
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private urls: string[] = [""];
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private mode: "single_urls" | "sitemap" | "crawl" = "single_urls";
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private includes: string[];
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private excludes: string[];
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private maxCrawledLinks: number;
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private returnOnlyUrls: boolean;
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private limit: number = 10000;
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private concurrentRequests: number = 20;
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authorize(): void {
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throw new Error("Method not implemented.");
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}
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authorizeNango(): Promise<void> {
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throw new Error("Method not implemented.");
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}
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private async convertUrlsToDocuments(
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urls: string[],
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inProgress?: (progress: Progress) => void
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): Promise<Document[]> {
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const totalUrls = urls.length;
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let processedUrls = 0;
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console.log("Converting urls to documents");
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console.log("Total urls", urls);
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const results: (Document | null)[] = new Array(urls.length).fill(null);
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for (let i = 0; i < urls.length; i += this.concurrentRequests) {
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const batchUrls = urls.slice(i, i + this.concurrentRequests);
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await Promise.all(batchUrls.map(async (url, index) => {
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const result = await scrapSingleUrl(url, true);
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processedUrls++;
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if (inProgress) {
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inProgress({
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current: processedUrls,
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total: totalUrls,
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status: "SCRAPING",
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currentDocumentUrl: url,
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});
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}
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results[i + index] = result;
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}));
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}
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return results.filter((result) => result !== null) as Document[];
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}
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async getDocuments(
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useCaching: boolean = false,
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inProgress?: (progress: Progress) => void
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): Promise<Document[]> {
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if (this.urls[0].trim() === "") {
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throw new Error("Url is required");
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}
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if (!useCaching) {
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if (this.mode === "crawl") {
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const crawler = new WebCrawler({
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initialUrl: this.urls[0],
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includes: this.includes,
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excludes: this.excludes,
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maxCrawledLinks: this.maxCrawledLinks,
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limit: this.limit,
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});
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const links = await crawler.start(inProgress, 5, this.limit);
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if (this.returnOnlyUrls) {
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return links.map((url) => ({
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content: "",
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metadata: { sourceURL: url },
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provider: "web",
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type: "text",
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}));
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}
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let documents = await this.convertUrlsToDocuments(links, inProgress);
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documents = await this.getSitemapData(this.urls[0], documents);
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console.log("documents", documents)
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// CACHING DOCUMENTS
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// - parent document
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const cachedParentDocumentString = await getValue('web-scraper-cache:' + this.normalizeUrl(this.urls[0]));
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if (cachedParentDocumentString != null) {
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let cachedParentDocument = JSON.parse(cachedParentDocumentString);
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if (!cachedParentDocument.childrenLinks || cachedParentDocument.childrenLinks.length < links.length - 1) {
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cachedParentDocument.childrenLinks = links.filter((link) => link !== this.urls[0]);
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await setValue('web-scraper-cache:' + this.normalizeUrl(this.urls[0]), JSON.stringify(cachedParentDocument), 60 * 60 * 24 * 10); // 10 days
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}
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} else {
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let parentDocument = documents.filter((document) => this.normalizeUrl(document.metadata.sourceURL) === this.normalizeUrl(this.urls[0]))
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await this.setCachedDocuments(parentDocument, links);
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}
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await this.setCachedDocuments(documents.filter((document) => this.normalizeUrl(document.metadata.sourceURL) !== this.normalizeUrl(this.urls[0])), []);
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documents = this.removeChildLinks(documents);
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documents = documents.splice(0, this.limit);
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return documents;
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}
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if (this.mode === "single_urls") {
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let documents = await this.convertUrlsToDocuments(this.urls, inProgress);
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const baseUrl = new URL(this.urls[0]).origin;
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documents = await this.getSitemapData(baseUrl, documents);
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await this.setCachedDocuments(documents);
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documents = this.removeChildLinks(documents);
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documents = documents.splice(0, this.limit);
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return documents;
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}
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if (this.mode === "sitemap") {
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const links = await getLinksFromSitemap(this.urls[0]);
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let documents = await this.convertUrlsToDocuments(links.slice(0, this.limit), inProgress);
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documents = await this.getSitemapData(this.urls[0], documents);
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await this.setCachedDocuments(documents);
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documents = this.removeChildLinks(documents);
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documents = documents.splice(0, this.limit);
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return documents;
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}
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return [];
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}
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let documents = await this.getCachedDocuments(this.urls.slice(0, this.limit));
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if (documents.length < this.limit) {
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const newDocuments: Document[] = await this.getDocuments(false, inProgress);
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newDocuments.forEach(doc => {
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if (!documents.some(d => this.normalizeUrl(d.metadata.sourceURL) === this.normalizeUrl(doc.metadata?.sourceURL))) {
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documents.push(doc);
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}
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});
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}
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documents = this.filterDocsExcludeInclude(documents);
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documents = this.removeChildLinks(documents);
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documents = documents.splice(0, this.limit);
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return documents;
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}
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private filterDocsExcludeInclude(documents: Document[]): Document[] {
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return documents.filter((document) => {
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const url = new URL(document.metadata.sourceURL);
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const path = url.pathname;
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if (this.excludes.length > 0 && this.excludes[0] !== '') {
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// Check if the link should be excluded
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if (this.excludes.some(excludePattern => new RegExp(excludePattern).test(path))) {
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return false;
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}
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}
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if (this.includes.length > 0 && this.includes[0] !== '') {
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// Check if the link matches the include patterns, if any are specified
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if (this.includes.length > 0) {
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return this.includes.some(includePattern => new RegExp(includePattern).test(path));
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}
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}
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return true;
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});
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}
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private normalizeUrl(url: string): string {
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if (url.includes("//www.")) {
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return url.replace("//www.", "//");
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}
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return url;
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}
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private removeChildLinks(documents: Document[]): Document[] {
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for (let document of documents) {
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if (document?.childrenLinks) delete document.childrenLinks;
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};
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return documents;
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}
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async setCachedDocuments(documents: Document[], childrenLinks?: string[]) {
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for (const document of documents) {
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if (document.content.trim().length === 0) {
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continue;
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}
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const normalizedUrl = this.normalizeUrl(document.metadata.sourceURL);
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await setValue('web-scraper-cache:' + normalizedUrl, JSON.stringify({
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...document,
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childrenLinks: childrenLinks || []
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}), 60 * 60 * 24 * 10); // 10 days
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}
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}
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async getCachedDocuments(urls: string[]): Promise<Document[]> {
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let documents: Document[] = [];
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for (const url of urls) {
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const normalizedUrl = this.normalizeUrl(url);
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console.log("Getting cached document for web-scraper-cache:" + normalizedUrl)
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const cachedDocumentString = await getValue('web-scraper-cache:' + normalizedUrl);
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if (cachedDocumentString) {
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const cachedDocument = JSON.parse(cachedDocumentString);
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documents.push(cachedDocument);
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// get children documents
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for (const childUrl of cachedDocument.childrenLinks) {
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const normalizedChildUrl = this.normalizeUrl(childUrl);
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const childCachedDocumentString = await getValue('web-scraper-cache:' + normalizedChildUrl);
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if (childCachedDocumentString) {
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const childCachedDocument = JSON.parse(childCachedDocumentString);
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if (!documents.find((doc) => doc.metadata.sourceURL === childCachedDocument.metadata.sourceURL)) {
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documents.push(childCachedDocument);
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}
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}
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}
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}
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}
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return documents;
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}
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setOptions(options: WebScraperOptions): void {
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if (!options.urls) {
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throw new Error("Urls are required");
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}
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console.log("options", options.crawlerOptions?.excludes)
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this.urls = options.urls;
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this.mode = options.mode;
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this.concurrentRequests = options.concurrentRequests ?? 20;
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this.includes = options.crawlerOptions?.includes ?? [];
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this.excludes = options.crawlerOptions?.excludes ?? [];
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this.maxCrawledLinks = options.crawlerOptions?.maxCrawledLinks ?? 1000;
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this.returnOnlyUrls = options.crawlerOptions?.returnOnlyUrls ?? false;
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this.limit = options.crawlerOptions?.limit ?? 10000;
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//! @nicolas, for some reason this was being injected and breakign everything. Don't have time to find source of the issue so adding this check
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this.excludes = this.excludes.filter(item => item !== '');
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// make sure all urls start with https://
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this.urls = this.urls.map((url) => {
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if (!url.trim().startsWith("http")) {
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return `https://${url}`;
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}
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return url;
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});
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}
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private async getSitemapData(baseUrl: string, documents: Document[]) {
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const sitemapData = await fetchSitemapData(baseUrl)
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if (sitemapData) {
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for (let i = 0; i < documents.length; i++) {
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const docInSitemapData = sitemapData.find((data) => this.normalizeUrl(data.loc) === this.normalizeUrl(documents[i].metadata.sourceURL))
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if (docInSitemapData) {
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let sitemapDocData: Partial<SitemapEntry> = {};
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if (docInSitemapData.changefreq) {
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sitemapDocData.changefreq = docInSitemapData.changefreq;
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}
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if (docInSitemapData.priority) {
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sitemapDocData.priority = Number(docInSitemapData.priority);
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}
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if (docInSitemapData.lastmod) {
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sitemapDocData.lastmod = docInSitemapData.lastmod;
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}
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if (Object.keys(sitemapDocData).length !== 0) {
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documents[i].metadata.sitemap = sitemapDocData;
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}
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}
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}
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}
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return documents;
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}
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}
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