backend/pageScrapper.js at main · Queryfy/backend · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
const scrollPageToBottom = require('puppeteer-autoscroll-down');
const Ecommerces = [
  'EXITO', //Ok
  'ALKOSTO', //Ok
  'MERCADOLIBRE', //Ok
  'FALABELLA', //Ok
];
const Endpoints = {
  EXITO: 'https://www.exito.com/__QUERY__?map=ft',
  ALKOSTO: 'https://www.alkosto.com/search/?text=__QUERY__',
  MERCADOLIBRE: 'https://listado.mercadolibre.com.co/__QUERY__',
  FALABELLA: 'https://www.falabella.com.co/falabella-co/search?Ntt=__QUERY__',
  FALABELLA_FALLBACK: 'https://www.falabella.com.co/falabella-co/search?Ntt=__QUERY__',
};

const SELECTORS = {
  EXITO: {
    WAIT: '.vtex-search-result-3-x-gallery',
    PRODUCT: '.vtex-product-summary-2-x-container',
    PRICE: '.exito-vtex-components-4-x-PricePDP span',
    URL: '.vtex-product-summary-2-x-clearLink',
    NAME: '.vtex-store-components-3-x-productBrand',
    IMAGE: '.vtex-product-summary-2-x-imageNormal',
  },
  ALKOSTO: {
    WAIT: '.product__list',
    PRODUCT: '.product__item',
    PRICE: '.product__price--discounts__price span',
    URL: '.product__item__top__title a',
    NAME: '.product__item__top__title a',
    IMAGE: '.product__item__information__image .js-algolia-product-click',
  },
  MERCADOLIBRE: {
    WAIT: '.ui-search-layout',
    PRODUCT: '.ui-search-layout__item',
    PRICE: '.ui-search-price__part',
    URL: '.ui-search-link',
    NAME: '.ui-search-item__title',
    IMAGE: '.slick-slide .ui-search-result-image__element',
  },
  FALABELLA: {
    WAIT: '.pod-group--products',
    PRODUCT: '.search-results-4-grid.grid-pod',
    PRICE: '.prices-4_GRID .jsx-3736277290',
    URL: '.layout_grid-view',
    NAME: '.pod-subTitle',
    IMAGE: '.pod-head img',
  },
  FALABELLA_FALLBACK: {
    WAIT: '.search-results--products',
    PRODUCT: '.pod',
    PRICE: '.pod-prices .prices-0',
    URL: '.list-view',
    NAME: '.pod-subTitle',
    IMAGE: 'img',
  },
};

class PageScrapper {
  constructor(browser, query) {
    this.browser_ = browser;
    this.query_ = query;
  }

  async scrapePage(ecommerce) {
    const url = Endpoints[ecommerce].replace('__QUERY__', this.query_);
    const page = await this.browser_.newPage();
    console.log(`Navigating to ${url}...`);
    try {
      await page.goto(url);
    } catch (err) {
      console.log('>>> goto error')
      console.log(err);
      return [];
    }
    await page.setViewport({
      width: 1200,
      height: 12000,
    });
    await scrollPageToBottom(page);

    try {
      await page.waitForSelector(SELECTORS[ecommerce].WAIT);
      const products = await page.$$eval(SELECTORS[ecommerce].PRODUCT,
          (products, SELECTORS, ecommerce) => {
        const defaultFormatter = (rawPrice) => {
          const reg = /\.|\(precio final\)/gmi;

          return +rawPrice.split('$')[1].replace(reg, '');
        }
        products = products.map(el => {
          const url = el.querySelector(SELECTORS[ecommerce].URL)?.href;
          const price = el.querySelector(SELECTORS[ecommerce].PRICE)?.innerText;
          const priceParsed = defaultFormatter(price);
          const name = el.querySelector(SELECTORS[ecommerce].NAME)?.innerText;
          const imageSrc = el.querySelector(SELECTORS[ecommerce].IMAGE)?.srcset ? el.querySelector(SELECTORS[ecommerce].IMAGE)?.srcset.split(' ')[0] : el.querySelector(SELECTORS[ecommerce].IMAGE)?.src;
          const image = imageSrc ?? 'https://via.placeholder.com/250';

          return {
            url,
            price,
            priceParsed,
            name,
            image,
            ecommerce: ecommerce.replace('_FALLBACK', ''),
          };
        });

        return products;
      }, SELECTORS, ecommerce);

      if (products.length === 0) {
        const ecommerceFallback = `${ecommerce}_FALLBACK`;
        console.log('>>> has zero products', {ecommerceFallback})
        if (SELECTORS[ecommerceFallback]) {
          console.log('>>> has fallback')
          return this.scrapePage(ecommerceFallback);
        }
      }
      return products;
    } catch (err) {
      console.log('>>> Error parsing products', err);
      if (!ecommerce.includes('FALLBACK')) {
        const ecommerceFallback = `${ecommerce}_FALLBACK`;
        if (SELECTORS[ecommerceFallback]) {
          console.log('>>> has fallback')
          return this.scrapePage(ecommerceFallback);
        }
      } else {
        return [];
      }
    }
  }

  async scraper () {
    console.time('fetch', 'Start');
    const products = Ecommerces;
    const promises = products.map((product) => this.scrapePage(product));
    const data = await Promise.all(promises);
    console.timeEnd('fetch', 'Finish!');

    return data.flat();
  }
}

module.exports = PageScrapper;