408 lines
16 KiB
JavaScript
408 lines
16 KiB
JavaScript
const fetch = require('node-fetch');
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const cheerio = require('cheerio');
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const { allRERequest, findPointInsideBoundingBox } = require('../url');
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const { getRealEstateTypeEnum } = require('../enums');
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const { getRegion, getMunicipality } = require('../codes')
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const Promise = require("bluebird");
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module.exports = class OlxCrawler {
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//TODO figure best way to handle paging
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constructor(fromPage = 0, toPage = 10, maxResults = 1000) {
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this.fromPage = fromPage;
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this.toPage = toPage;
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this.maxResults = maxResults;
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}
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async indexSingle(url, email) {
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try {
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const res = await fetch(url);
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const body = await res.text();
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const $ = cheerio.load(body);
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//TODO figure out what to do with username
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const username = $('#lg > div.desno2.profil > div:nth-child(2) > div.vrsta1.vrsta_desno > a > div.username > span').text();
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// if (IGNORED_USERNAMES.includes((username || '').toLowerCase())) {
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// return null;
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// }
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//TODO remove properties that are not needed, and add some if they are missing
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const title = $('#naslovartikla').text();
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const realEstateType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(3) > div > span:nth-child(3) > a > span').text();
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const price = $('#pc > p:nth-child(2)').text();
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const size = $('#dodatnapolja1 > div:nth-child(1) > div.df2').text();
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const rooms = $('#dodatnapolja1 > div:nth-child(2) > div.df2').text();
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const address = $('#dodatnapolja1 > div:nth-child(5) > div.df2').text();
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const gardenSize = $('#dodatnapolja1 > div:nth-child(6) > div.df2').text();
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const location = $('#artikal_glavni_div > div.artikal_lijevo > div.op.pop.mobile-lokacija').attr('data-content');
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const adType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(2) > div.df2').text();
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const time = $('time').attr('datetime');
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const olxId = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(4) > div.df2').text();
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const descriptions = $('.artikal_detaljniopis_tekst');
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// const floor = $('#dodatnapolja1').find(':contains(Sprat)').last().nextAll().text();
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const latLngRe = /LatLng\(([0-9]+\.[0-9]+)\,\s+([0-9]+\.[0-9]+)\)/g;
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const imgRe = /href":("[^"]*")/g;
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const matches = latLngRe.exec(body);
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let lng = '',
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lat = '';
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const parseRooms = (rooms) => parseInt([...rooms].filter(c => !isNaN(c)).filter(c => c.trim()).join())
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const parsePrice = (price) => parseFloat(price.replace(".", ""))
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// TODO we dont save images ??
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// const images = [];
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// const imgMatches = body.match(imgRe);
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// for (let i = 0; imgMatches && i < imgMatches.length; i++) {
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// let img = imgMatches[i].replace("href\":", "")
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// img = img.replace("\"", "");
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// img = img.replace("\"", "");
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// images.push(img);
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// }
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// const uploadPromises = images.map(img => {
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// const imgFixed = eval(`'${img}'`);
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// return cloudinary.uploader.upload(eval(`'${img}'`));
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// });
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// const uploadResults = await Promise.all(uploadPromises);
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// const cloudinaryImages = uploadResults.map(ur => ur.url);
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if (matches && matches.length >= 3) {
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lat = matches[1];
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lng = matches[2];
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}
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const parsedPrice = parsePrice(price);
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const locationArray = location.split(",");
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const region = locationArray[0];
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const municipality = locationArray[1];
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const data = {
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realEstateType: this.getCategoryId(realEstateType),
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email : email,
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olxId: olxId,
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// category: category,
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url,
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title,
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price: isNaN(parsedPrice) ? price : parsedPrice,
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size: parseFloat(size),
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gardenSize: parseFloat(gardenSize),
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address,
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region,
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municipality,
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// adType: AD_TYPE_SALE,
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time,
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shortDescription: descriptions.first().text(),
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longDescription: descriptions.last().text(),
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lat,
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lng,
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loc: [parseFloat(lat), parseFloat(lng)],
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// images: cloudinaryImages
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};
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return data;
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} catch (e) {
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console.error('Exception caught: ' + e.message);
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}
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return null;
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}
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async indexPage(olxUrl, maxResults = 1000) {
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try {
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// console.log('Starting to index page: ' + pageNr);
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// const url = `http://www.olx.ba/pretraga?vrsta=samoprodaja&sort_order=desc&kategorija=23&sort_po=datum&kanton=9&stranica=${pageNr}`;
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const res = await fetch(olxUrl.url);
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const body = await res.text();
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const $ = cheerio.load(body);
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const hrefs = [];
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const results = [];
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$('#rezultatipretrage').find('.listitem').each((i, elem) => {
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const href = $(elem).find('a').first().attr('href');
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hrefs.push(href);
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});
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let actualNoOfResults = (hrefs.length <= maxResults) ? hrefs.length : maxResults;
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for (let i = 0; i < hrefs.length; i++) {
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console.log(`indexing: ${hrefs[i]}`);
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const singleData = await this.indexSingle(hrefs[i], olxUrl.email);
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if (singleData) {
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results.push(singleData);
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}
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// await this.sleep(500);
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}
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return results;
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} catch (e) {
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console.error('Exception caught:' + e);
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}
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}
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getCategoryId (category) {
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if (category === 'Stanovi') {
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return 'stan';
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} else if (category === 'Vikendice') {
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return 'vikendica';
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} else if (category === 'Kuće') {
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return 'kuca';
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}
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}
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async indexPages(urls, start, end, maxResults = 1000) {
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// let results = {};
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// for (let i = start; i <= end; i++) {
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// let result = await this.indexPage(i, maxResults);
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// Object.assign(results, result)
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// await this.sleep(5000);
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// }
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// return results;
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let results = [];
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const indexers= [];
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let it = 3
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for (let url of urls) {
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// let result = await this.indexPage(url, maxResults);
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// results.push(result);
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it++
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indexers.push(new Indexer(it * 2000));
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}
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return Promise.map(indexers, function (indexer) {
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return indexer.indexPage();
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}).then(async (results) => {
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return results
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})
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}
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async crawl() {
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const filteredResults = [];
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const realestateRequests = await allRERequest()
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const urls = this.createRequestUrls(realestateRequests);
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let results = await this.indexPages(urls, this.fromPage, this.toPage, this.maxResults);
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for (const result of results) {
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for (const re1 of result) {
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if (re1.lat !== undefined && re1.lat !== null && re1.lat !== "") {
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const pointInsideBoundingBox = await findPointInsideBoundingBox([re1.lng, re1.lat]);
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if (pointInsideBoundingBox[0].length !== 0) {
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filteredResults.push(re1);
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}
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}
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}
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}
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// await this.sleep(10000);
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console.log(filteredResults);
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return filteredResults;
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}
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async sleep(ms) {
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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createRequestUrls(realestateRequests) {
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const urls = []
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for (const request of realestateRequests) {
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const realsestateType = "kategorija=" + getRealEstateTypeEnum(request.realEstateType).olxCategory;
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const region = "kanton=" + getRegion(request.region).olxid;
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const municipality = "grad%5B%5D=" + getMunicipality(request.region, request.municipality).olxid;
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const sizeMin = "kvadrata_min=" + request.sizeMin;
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const sizeMax = "kvadrata_max=" + request.sizeMax;
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const priceMin = "od=" + request.priceMin;
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const priceMax = "do=" + request.priceMax;
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const olxUrl = {
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url: "https://www.olx.ba/pretraga?" + realsestateType + "&id=2&stanje=0&vrstapregleda=tabela&sort_order=desc&" + region + "&" + municipality + "&" + priceMin + "&" + priceMax + "&vrsta=samoprodaja&" + sizeMin + "&" + sizeMax,
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email: request.email
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}
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console.log(olxUrl.url);
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urls.push(olxUrl);
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}
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return urls;
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}
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};
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class Indexer {
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constructor(olxUrl, email, uuid) {
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this.olxUrl = olxUrl
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this.email = email
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this.uuid = uuid
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}
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async indexPage() {
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try {
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// console.log('Starting to index page: ' + pageNr);
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// const url = `http://www.olx.ba/pretraga?vrsta=samoprodaja&sort_order=desc&kategorija=23&sort_po=datum&kanton=9&stranica=${pageNr}`;
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// const res = await fetch(this.olxUrl.url);
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// const body = await res.text();
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// const $ = cheerio.load(body);
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// const hrefs = [];
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// const results = [];
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// $('#rezultatipretrage').find('.listitem').each((i, elem) => {
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// const href = $(elem).find('a').first().attr('href');
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// hrefs.push(href);
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// });
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// let actualNoOfResults = (hrefs.length <= maxResults) ? hrefs.length : maxResults;
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// for (let i = 0; i < hrefs.length; i++) {
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// console.log(`indexing: ${hrefs[i]}`);
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// const singleData = await this.indexSingle(hrefs[i], this.olxUrl.email);
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// if (singleData) {
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// results.push(singleData);
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// }
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// // await this.sleep(500);
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// }
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await this.sleep(this.olxUrl);
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console.log('Finished indexing PAGE');
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const singleIndex = [new Indexer(this.olxUrl), new Indexer(this.olxUrl), new Indexer(this.olxUrl), new Indexer(this.olxUrl), new Indexer(this.olxUrl)]
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return Promise.map(singleIndex, function (indexer) {
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return indexer.indexSingle();
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}).then(async (results) => {
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return results
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})
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// return results;
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} catch (e) {
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console.error('Exception caught:' + e);
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}
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}
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async indexSingle() {
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// try {
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// const res = await fetch(url);
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// const body = await res.text();
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// const $ = cheerio.load(body);
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// //TODO figure out what to do with username
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// const username = $('#lg > div.desno2.profil > div:nth-child(2) > div.vrsta1.vrsta_desno > a > div.username > span').text();
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// // if (IGNORED_USERNAMES.includes((username || '').toLowerCase())) {
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// // return null;
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// // }
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// //TODO remove properties that are not needed, and add some if they are missing
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// const title = $('#naslovartikla').text();
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// const realEstateType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(3) > div > span:nth-child(3) > a > span').text();
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// const price = $('#pc > p:nth-child(2)').text();
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// const size = $('#dodatnapolja1 > div:nth-child(1) > div.df2').text();
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// const rooms = $('#dodatnapolja1 > div:nth-child(2) > div.df2').text();
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// const address = $('#dodatnapolja1 > div:nth-child(5) > div.df2').text();
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// const gardenSize = $('#dodatnapolja1 > div:nth-child(6) > div.df2').text();
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// const location = $('#artikal_glavni_div > div.artikal_lijevo > div.op.pop.mobile-lokacija').attr('data-content');
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// const adType = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(2) > div.df2').text();
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// const time = $('time').attr('datetime');
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// const olxId = $('#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(4) > div.df2').text();
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// const descriptions = $('.artikal_detaljniopis_tekst');
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// // const floor = $('#dodatnapolja1').find(':contains(Sprat)').last().nextAll().text();
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// const latLngRe = /LatLng\(([0-9]+\.[0-9]+)\,\s+([0-9]+\.[0-9]+)\)/g;
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// const imgRe = /href":("[^"]*")/g;
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// const matches = latLngRe.exec(body);
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// let lng = '',
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// lat = '';
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// const parseRooms = (rooms) => parseInt([...rooms].filter(c => !isNaN(c)).filter(c => c.trim()).join())
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// const parsePrice = (price) => parseFloat(price.replace(".", ""))
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// // TODO we dont save images ??
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// // const images = [];
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// // const imgMatches = body.match(imgRe);
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// // for (let i = 0; imgMatches && i < imgMatches.length; i++) {
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// // let img = imgMatches[i].replace("href\":", "")
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// // img = img.replace("\"", "");
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// // img = img.replace("\"", "");
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// // images.push(img);
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// // }
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// // const uploadPromises = images.map(img => {
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// // const imgFixed = eval(`'${img}'`);
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// // return cloudinary.uploader.upload(eval(`'${img}'`));
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// // });
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// // const uploadResults = await Promise.all(uploadPromises);
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// // const cloudinaryImages = uploadResults.map(ur => ur.url);
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// if (matches && matches.length >= 3) {
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// lat = matches[1];
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// lng = matches[2];
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// }
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// const parsedPrice = parsePrice(price);
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// const locationArray = location.split(",");
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// const region = locationArray[0];
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// const municipality = locationArray[1];
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// const data = {
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// realEstateType: this.getCategoryId(realEstateType),
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// email : email,
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// olxId: olxId,
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// // category: category,
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// url,
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// title,
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// price: isNaN(parsedPrice) ? price : parsedPrice,
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// size: parseFloat(size),
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// gardenSize: parseFloat(gardenSize),
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// address,
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// region,
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// municipality,
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// // adType: AD_TYPE_SALE,
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// time,
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// shortDescription: descriptions.first().text(),
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// longDescription: descriptions.last().text(),
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// lat,
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// lng,
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// loc: [parseFloat(lat), parseFloat(lng)],
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// // images: cloudinaryImages
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// };
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// return data;
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// } catch (e) {
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// console.error('Exception caught: ' + e.message);
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// }
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// return null;
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await this.sleep(this.olxUrl);
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console.log("Finished indexing single page");
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return {};
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}
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async sleep(ms) {
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console.log(ms);
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return new Promise(resolve => setTimeout(resolve, ms));
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}
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}
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