app/common/enums.js

@@ -0,0 +1,44 @@
+const AD_TYPE = {
+  AD_TYPE_SALE: "SALE",
+  AD_TYPE_RENT: "RENT"
+};
+
+const AD_CATEGORY = {
+  CATEGORY_FLAT: "FLAT",
+  CATEGORY_HOUSE: "HOUSE",
+  CATEGORY_OFFICE: "OFFICE",
+  CATEGORY_LAND: "LAND",
+  CATEGORY_APARTMENT: "APARTMENT",
+  CATEGORY_GARAGE: "GARAGE"
+};
+
+const IGNORED_USERNAMES = [];
+
+const AD_STATUS = {
+  STATUS_NORMAL: 1,
+  STATUS_RESERVED: 2,
+  STATUS_SOLD: 3,
+  STATUS_DELETED: 4,
+  STATUS_URGENT: 5,
+  STATUS_DISCOUNTED: 6
+};
+
+const AD_AGENCY = {
+  OLX: "OLX"
+};
+
+const CRAWLER_AD_TYPE = {
+  NONE: 0,
+  ALL: 1,
+  ONLY_SELL: 2,
+  ONLY_RENT: 3
+};
+
+module.exports = {
+  AD_TYPE,
+  IGNORED_USERNAMES,
+  AD_CATEGORY,
+  AD_STATUS,
+  AD_AGENCY,
+  CRAWLER_AD_TYPE
+};

app/crawler/crawl.js

@@ -0,0 +1,35 @@
+"use strict";
+/*
+   Entry point for crawling functionality
+   All communication between crawlers and savers is here
+   All environment specific configuration is read here and
+   passed to the crawlers and savers.
+*/
+
+require("dotenv").config();
+const OlxCrawler = require("./specific/olx");
+const { OLX_CONFIG } = require("./crawlerConfig");
+const PostgresSaver = require("./savers/postgres");
+
+const crawlers = [
+  new OlxCrawler(
+    OLX_CONFIG.OLX_START_PAGE,
+    OLX_CONFIG.OLX_END_PAGE,
+    OLX_CONFIG.OLX_MAX_RESULTS_PER_PAGE,
+    [new PostgresSaver()],
+    OLX_CONFIG.OLX_CRAWLER_AD_TYPE,
+    OLX_CONFIG.OLX_CRAWLER_AD_CATEGORIES
+  )
+];
+
+async function crawlAll() {
+  for (let crawler of crawlers) {
+    try {
+      await crawler.crawl();
+    } catch (e) {
+      console.log("Error crawling. Trying next crawler! ", e);
+    }
+  }
+}
+
+crawlAll();

app/crawler/crawlerConfig.js

@@ -0,0 +1,32 @@
+"use strict";
+require("dotenv").config({ path: "../../.env" });
+const { CRAWLER_AD_TYPE, AD_CATEGORY } = require("../common/enums");
+
+const crawlerAdType =
+  process.env.OLX_CRAWLER_AD_TYPE !== undefined
+    ? CRAWLER_AD_TYPE[process.env.OLX_CRAWLER_AD_TYPE]
+    : null;
+
+const parsedCrawlerAdCategories =
+  process.env.OLX_CRAWLER_AD_CATEGORIES !== undefined
+    ? process.env.OLX_CRAWLER_AD_CATEGORIES.split(",").map(category =>
+        category.trim()
+      )
+    : ["CATEGORY_FLAT", "CATEGORY_HOUSE"];
+
+const transformedCrawlerAdCategories = parsedCrawlerAdCategories
+  .map(categoryName => AD_CATEGORY[categoryName])
+  .filter(category => !!category);
+
+const OLX_CONFIG = {
+  OLX_START_PAGE: parseInt(process.env.OLX_START_PAGE) || 1,
+  OLX_END_PAGE: parseInt(process.env.OLX_END_PAGE) || 10,
+  OLX_MAX_RESULTS_PER_PAGE:
+    parseInt(process.env.OLX_MAX_RESULTS_PER_PAGE) || 50,
+  OLX_CRAWLER_AD_TYPE: crawlerAdType || CRAWLER_AD_TYPE.NONE,
+  OLX_CRAWLER_AD_CATEGORIES: transformedCrawlerAdCategories
+};
+
+module.exports = {
+  OLX_CONFIG
+};

app/crawler/savers/postgres.js

@@ -0,0 +1,21 @@
+const { bulkUpsertRealEstates } = require("../../helpers/db/realEstate");
+
+class PostgresSaver {
+  connect() {
+    //TODO: It seems we never worry about open/close connection with Sequelize ?
+    //TODO: Check if postgres is ready
+    return true;
+  }
+
+  async save(results) {
+    console.log("[POSTGRES] Saving...");
+    await bulkUpsertRealEstates(results);
+  }
+
+  close() {
+    //TODO: It seems we never worry about open/close connection with Sequelize ?
+    return true;
+  }
+}
+
+module.exports = PostgresSaver;

app/crawler/specific/olx.js

@@ -0,0 +1,386 @@
+"use strict";
+
+let fetch = require("node-fetch");
+let cheerio = require("cheerio");
+
+const {
+  AD_TYPE,
+  AD_CATEGORY,
+  IGNORED_USERNAMES,
+  AD_AGENCY,
+  AD_STATUS,
+  CRAWLER_AD_TYPE
+} = require("../../common/enums");
+
+const OLX_ENUMS = {
+  OLX_AD_TYPE: {},
+  OLX_AD_CATEGORY: {},
+  MAX_DETAIL_FIELDS: 30
+};
+
+OLX_ENUMS.OLX_AD_TYPE[CRAWLER_AD_TYPE.ALL] = "";
+OLX_ENUMS.OLX_AD_TYPE[CRAWLER_AD_TYPE.ONLY_SELL] = "&vrsta=samoprodaja";
+OLX_ENUMS.OLX_AD_TYPE[CRAWLER_AD_TYPE.ONLY_RENT] = "&vrsta=samoizdavanje";
+
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_FLAT] = "&kategorija=23";
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_HOUSE] = "&kategorija=24";
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_LAND] = "&kategorija=29";
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_OFFICE] = "&kategorija=25";
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_APARTMENT] = "&kategorija=27";
+OLX_ENUMS.OLX_AD_CATEGORY[AD_CATEGORY.CATEGORY_GARAGE] = "&kategorija=30";
+
+class OlxCrawler {
+  constructor(
+    fromPage = 1,
+    toPage = 10,
+    maxResults = 1000,
+    savers = [],
+    crawlerAdTypes = CRAWLER_AD_TYPE.ALL,
+    crawlerAdCategories = [
+      AD_CATEGORY.CATEGORY_FLAT,
+      AD_CATEGORY.CATEGORY_HOUSE
+    ]
+  ) {
+    this.fromPage = fromPage;
+    this.toPage = toPage;
+    this.maxResults = maxResults;
+    this.savers = savers;
+    this.baseUrl = "https://www.olx.ba/pretraga?sort_order=desc&sort_po=datum";
+    this.crawlerAdTypes = crawlerAdTypes;
+    this.crawlerAdCategories = crawlerAdCategories;
+  }
+
+  async crawl() {
+    console.log("[OLX] Crawler started");
+    const crawlAdTypes = this.crawlerAdTypes;
+    const crawlAdCategories = this.crawlerAdCategories;
+
+    const urlWithAdTypeFilter = `${this.baseUrl}${OLX_ENUMS.OLX_AD_TYPE[crawlAdTypes]}`;
+
+    if (crawlAdCategories && crawlAdTypes) {
+      const asyncPagesIndexingByCategory = [];
+      for (const adCategory of crawlAdCategories) {
+        asyncPagesIndexingByCategory.push(
+          this.indexPages(
+            `${urlWithAdTypeFilter}${OLX_ENUMS.OLX_AD_CATEGORY[adCategory]}`
+          )
+        );
+      }
+
+      await Promise.all(asyncPagesIndexingByCategory);
+    }
+    console.log("[OLX] Crawler finished");
+  }
+
+  async indexPages(url) {
+    const startPage = this.fromPage;
+    const endPage = this.toPage;
+    const maxResultsPerPage = this.maxResults;
+
+    for (let pageNumber = startPage; pageNumber <= endPage; pageNumber++) {
+      const singlePageResults = await this.indexSinglePage(
+        url,
+        pageNumber,
+        maxResultsPerPage
+      );
+      await this.saveCrawledResults(singlePageResults);
+      await this.sleep(5000);
+    }
+  }
+
+  async indexSinglePage(urlWithoutPageNumber, pageNumber, maxResultsPerPage) {
+    try {
+      const url = `${urlWithoutPageNumber}&stranica=${pageNumber}`;
+
+      const res = await fetch(url);
+      const body = await res.text();
+      const $ = cheerio.load(body);
+      let hrefs = [];
+      const singlePageResults = [];
+
+      $("#rezultatipretrage")
+        .find(".listitem")
+        .each((i, elem) => {
+          const href = $(elem)
+            .find("a")
+            .first()
+            .attr("href");
+          if (href) {
+            hrefs.push(href);
+          }
+        });
+
+      let actualNoOfResults =
+        hrefs.length <= maxResultsPerPage ? hrefs.length : maxResultsPerPage;
+
+      for (let i = 0; i < actualNoOfResults; i++) {
+        console.log(`Scraping : ${hrefs[i]}`);
+
+        const adData = await this.scrapeAd(hrefs[i]);
+
+        if (adData) {
+          singlePageResults.push(adData);
+        }
+        await this.sleep(500);
+      }
+
+      return singlePageResults;
+    } catch (e) {
+      console.error("Exception caught:" + e);
+    }
+  }
+
+  async scrapeAd(url) {
+    try {
+      const adPageSource = await fetch(url);
+      const body = await adPageSource.text();
+      const $ = cheerio.load(body);
+      let status = AD_STATUS.STATUS_NORMAL;
+
+      const username = $(
+        "#lg > div.desno2.profil > div:nth-child(2) > div.vrsta1.vrsta_desno > a > div.username > span"
+      ).text();
+
+      if (IGNORED_USERNAMES.includes((username || "").toLowerCase())) {
+        return null;
+      }
+
+      const title = $("#naslovartikla").text();
+      const descriptions = $(".artikal_detaljniopis_tekst");
+      const category = $(
+        "#artikal_glavni_div > div.artikal_lijevo > div:nth-child(3) > div > span:nth-child(3) > a > span"
+      ).text();
+
+      //====== PRICE DETECTION AND EXTRACTION =====
+      let price = null;
+      const normalPriceValue = $("#pc > p:nth-child(2)").text();
+      const urgentPriceValue = $(
+        "#artikal_glavni_div > div.artikal_lijevo > div:nth-child(5) > p"
+      ).text();
+
+      if (normalPriceValue && normalPriceValue.length > 0) {
+        price = normalPriceValue;
+        if (
+          $("#pc > p.n")
+            .text()
+            .indexOf("Hitna") !== -1
+        ) {
+          status = AD_STATUS.STATUS_URGENT;
+        } else {
+          status = AD_STATUS.STATUS_NORMAL;
+        }
+      } else if (urgentPriceValue && urgentPriceValue.length > 0) {
+        const priceValues = urgentPriceValue.split("KM");
+        //priceValues will contain values like ["100000", "90000", ...], second element is urgent price
+        if (priceValues.length > 1) {
+          price = priceValues[1].trim();
+          status = AD_STATUS.STATUS_DISCOUNTED;
+        } else {
+          throw { message: "Can't find urgent price" };
+        }
+      } else {
+        throw {
+          message: "Can't find price (it is not normal nor urgent price ?)"
+        };
+      }
+
+      //====== OTHER AD INFORMATION ===============
+      let adType = null;
+      let olxId = null;
+
+      let otherInformationDivId;
+      //We need to locate DIV ID where other information are stored
+      for (let possibleId = 10; possibleId <= 20; possibleId++) {
+        const adTypeFieldTitle = $(
+          `#artikal_glavni_div > div.artikal_lijevo > div:nth-child(${possibleId}) > div:nth-child(2) > div.df1`
+        )
+          .text()
+          .trim();
+
+        if (adTypeFieldTitle === "Vrsta oglasa") {
+          otherInformationDivId = possibleId;
+          break;
+        }
+      }
+
+      if (!otherInformationDivId) {
+        throw { message: "Other information DIV could not be found" };
+      }
+
+      const olxIdFieldSelector = `#artikal_glavni_div > div.artikal_lijevo > div:nth-child(${otherInformationDivId}) > div:nth-child(4)`;
+
+      adType = $(
+        `#artikal_glavni_div > div.artikal_lijevo > div:nth-child(${otherInformationDivId}) > div:nth-child(2) > div.df2`
+      )
+        .text()
+        .trim();
+      const olxIdFieldTitle = $(`${olxIdFieldSelector} > div.df1`)
+        .text()
+        .trim();
+      olxId = $(`${olxIdFieldSelector} > div.df2`)
+        .text()
+        .trim();
+
+      if (olxIdFieldTitle !== "OLX ID") {
+        throw { message: "Cannot find correct OLX ID" };
+      }
+      //===========================================
+
+      //====== DETAIL INFORMATION FIELDS ==========
+      let area = null;
+      let gardenSize = null;
+
+      let fieldIndex = 1;
+      do {
+        const fieldSelector = `#dodatnapolja1 > div:nth-child(${fieldIndex})`;
+        const fieldTitleSelector = `${fieldSelector} > div.df1`;
+        const fieldValueSelector = `${fieldSelector} > div.df2`;
+
+        const fieldTitle = $(fieldTitleSelector)
+          .text()
+          .trim();
+        const fieldValue = $(fieldValueSelector)
+          .text()
+          .trim();
+
+        switch (fieldTitle) {
+          case "Kvadrata":
+            area = fieldValue;
+            break;
+          case "Okućnica (kvadratura)":
+            gardenSize = fieldValue;
+            break;
+        }
+
+        if (++fieldIndex === OLX_ENUMS.MAX_DETAIL_FIELDS || fieldTitle === "") {
+          break;
+        }
+      } while (true);
+      //===========================================
+
+      //====== UNUSED FIELDS FOR NOW ==============
+      const time = $("time").attr("datetime");
+      const numberOfViews = $(
+        "#artikal_glavni_div > div.artikal_lijevo > div:nth-child(18) > div:nth-child(6) > div.df2"
+      ).text();
+      //===========================================
+
+      //=========================================
+      const parsedCategory = this.getAdCategoryId(category);
+      if (!parsedCategory) {
+        throw { message: "Unknown ad category" };
+      }
+
+      const parsedAdType = this.getAdTypeId(adType);
+      if (!parsedAdType) {
+        throw { message: "Unknown ad type" };
+      }
+
+      const parsedArea = this.parseArea(area) || null;
+      const parsedGardenSize = this.parseArea(gardenSize) || null;
+      const parsedPrice = this.parsePrice(price) || null;
+
+      const latLngRegex = /LatLng\(([0-9]+\.[0-9]+)\,\s+([0-9]+\.[0-9]+)\)/g;
+      const locationLatLngMatches = latLngRegex.exec(body);
+
+      let locationLat = null;
+      let locationLong = null;
+      if (locationLatLngMatches && locationLatLngMatches.length >= 3) {
+        locationLat = parseFloat(locationLatLngMatches[1]) || null;
+        locationLong = parseFloat(locationLatLngMatches[2]) || null;
+      }
+
+      const data = {
+        url,
+        agencyObjectId: olxId,
+        originAgencyName: AD_AGENCY.OLX,
+        realEstateType: this.getAdCategoryId(category),
+        adType: parsedAdType,
+        title,
+        price: parsedPrice,
+        area: parsedArea,
+        gardenSize: parsedGardenSize,
+        shortDescription: descriptions.first().text(),
+        longDescription: descriptions.last().text(),
+        streetNumber: 0,
+        streetName: "",
+        locality: "",
+        municipality: "",
+        city: "",
+        region: "",
+        entity: "",
+        country: "",
+        locationLat,
+        locationLong,
+        adStatus: status
+      };
+
+      return data;
+    } catch (e) {
+      console.error("Exception caught: " + e.message, "\r\nURL:", url);
+    }
+    return null;
+  }
+
+  //======= HELPER FUNCTIONS =============
+
+  getAdCategoryId(categoryText) {
+    switch (categoryText) {
+      case "Stanovi":
+        return AD_CATEGORY.CATEGORY_FLAT;
+      case "Zemljišta":
+        return AD_CATEGORY.CATEGORY_LAND;
+      case "Kuće":
+        return AD_CATEGORY.CATEGORY_HOUSE;
+      case "Poslovni prostori":
+        return AD_CATEGORY.CATEGORY_OFFICE;
+      default:
+        return undefined;
+    }
+  }
+
+  getAdTypeId(adTypeText) {
+    switch (adTypeText) {
+      case "Prodaja":
+        return AD_TYPE.AD_TYPE_SALE;
+      case "Izdavanje":
+        return AD_TYPE.AD_TYPE_RENT;
+      default:
+        return undefined;
+    }
+  }
+
+  parseArea(areaText) {
+    if (!areaText) {
+      return NaN;
+    }
+    const removeDotsExceptLastOneRegex = /[.](?=.*[.])/g;
+    const textWithOnlyOneDecimalDot = areaText
+      .replace(",", ".")
+      .replace(removeDotsExceptLastOneRegex, "");
+
+    return parseFloat(textWithOnlyOneDecimalDot);
+  }
+
+  parsePrice(priceText) {
+    if (!priceText) {
+      return NaN;
+    }
+    const formattedPriceText = priceText.replace(".", "").replace(",", ".");
+    return parseFloat(formattedPriceText);
+  }
+
+  async sleep(ms) {
+    return new Promise(resolve => setTimeout(resolve, ms));
+  }
+
+  async saveCrawledResults(results) {
+    const savers = this.savers;
+
+    for (const saver of savers) {
+      await saver.save(results);
+    }
+  }
+}
+
+module.exports = OlxCrawler;

app/helpers/crawlers/olxClawler.js

@@ -1,435 +0,0 @@
-const fetch = require("node-fetch");
-const cheerio = require("cheerio");
-const { allRERequest, findPointInsideBoundingBox } = require("../db/dbHelper");
-const { getRealEstateTypeEnum } = require("../enums");
-const { getRegion, getMunicipality } = require("../codes");
-const Promise = require("bluebird");
-
-module.exports = class OlxCrawler {
-  //TODO figure best way to handle paging
-  constructor(hrefs = []) {
-    this.hrefs = hrefs;
-  }
-
-  async indexPages(urls) {
-    const indexers = [];
-
-    urls.forEach(url => {
-      indexers.push(new Indexer(url));
-    });
-
-    return Promise.map(indexers, function(indexer) {
-      return indexer.indexWithPagination();
-    }).then(async results => {
-      return results;
-    });
-  }
-
-  async crawl() {
-    const filteredResults = [];
-    const realEstateRequests = await allRERequest();
-    const urls = this.createRequestUrls(realEstateRequests);
-    let results = await this.indexPages(
-      urls,
-      this.fromPage,
-      this.toPage,
-      this.maxResults
-    );
-    const flatResults = results.flat();
-    if (flatResults) {
-      for (const finalResult of flatResults) {
-        if (null !== finalResult) {
-          if (
-            finalResult.lat !== undefined &&
-            finalResult.lat !== null &&
-            finalResult.lat !== ""
-          ) {
-            const pointInsideBoundingBox = await findPointInsideBoundingBox(
-              [finalResult.lng, finalResult.lat],
-              finalResult.email,
-              finalResult.uuid
-            );
-
-            if (pointInsideBoundingBox[0].length !== 0) {
-              finalResult.hasLocation = true;
-              filteredResults.push(finalResult);
-            } else {
-              finalResult.hasLocation = false;
-              filteredResults.push(finalResult);
-            }
-          }
-        }
-      }
-      return filteredResults;
-    }
-    return [];
-  }
-
-  createRequestUrls(realEstateRequests) {
-    const urls = [];
-
-    for (const request of realEstateRequests) {
-      const {
-        realEstateType,
-        region,
-        sizeMin,
-        sizeMax,
-        priceMin,
-        priceMax
-      } = request;
-
-      const urlRealEstateParams = [
-        {
-          paramName: "kanton",
-          paramValue: region,
-          useParam: false
-        },
-        {
-          paramName: "kategorija",
-          paramValue: getRealEstateTypeEnum(realEstateType).olxid,
-          useParam: true
-        },
-        {
-          paramName: "kvadrata_min",
-          paramValue: sizeMin,
-          useParam: true
-        },
-        {
-          paramName: "kvadrata_max",
-          paramValue: sizeMax,
-          useParam: true
-        },
-        {
-          paramName: "od",
-          paramValue: priceMin,
-          useParam: true
-        },
-        {
-          paramName: "do",
-          paramValue: priceMax,
-          useParam: true
-        }
-      ];
-      const urlResultsParams = [
-        {
-          paramName: "vrstapregleda",
-          paramValue: "tabela",
-          useParam: true
-        },
-        {
-          paramName: "sort_order",
-          paramValue: "desc",
-          useParam: true
-        },
-        {
-          paramName: "vrsta",
-          paramValue: "samoprodaja",
-          useParam: true
-        },
-        {
-          paramName: "stranica",
-          paramValue: "0",
-          useParam: true
-        }
-      ];
-
-      const paramsReduceFunction = (accumulatedValue, currentParam) => {
-        const { paramName, paramValue, useParam } = currentParam;
-        if (useParam) {
-          return `${accumulatedValue}&${paramName}=${paramValue}`;
-        } else {
-          return accumulatedValue;
-        }
-      };
-
-      const reducedRealEstateParams = urlRealEstateParams.reduce(
-        paramsReduceFunction,
-        ""
-      );
-      const reducedResultsParams = urlResultsParams.reduce(
-        paramsReduceFunction,
-        ""
-      );
-
-      const olxUrl = {
-        url: `https://www.olx.ba/pretraga?${reducedRealEstateParams}${reducedResultsParams}`,
-        email: request.email,
-        uuid: request.uniqueId,
-        hrefs: this.hrefs
-      };
-      urls.push(olxUrl);
-    }
-
-    return urls;
-  }
-};
-
-class Indexer {
-  /**
-   *
-   * @param {String|Array} olxUrl single or array of objects containing url email and uuid
-   * @param {Array} hrefResutls array contaning urls from crawler results
-   */
-
-  constructor(olxUrl, hrefResutls) {
-    this.olxUrl = olxUrl;
-    this.hrefResutls = hrefResutls;
-  }
-
-  async indexWithPagination(pageNumber = 1) {
-    const pageNr = this.olxUrl.url.match(/\d+$/);
-    const indexers = this.prepareIndexers(pageNumber ? [pageNumber] : pageNr);
-
-    try {
-      return Promise.map(indexers.indexers, function(indexer) {
-        return indexer.indexPage(pageNumber);
-      }).then(async results => {
-        let hasResults = false;
-
-        results.forEach(result => {
-          if (!hasResults) {
-            hasResults = result.hasResults;
-          }
-        });
-
-        if (!hasResults) {
-          const singlePageIndexers = this.prepareHrefIndexers(results);
-          if (singlePageIndexers.length === 0) {
-            return [];
-          }
-
-          return Promise.map(singlePageIndexers, function(indexer) {
-            return indexer.indexSingle();
-          }).then(async results => {
-            return results;
-          });
-        } else {
-          const newResults = await this.indexWithPagination(
-            results[0].pageNumber + 5
-          );
-          const singlePageIndexers = this.prepareHrefIndexers(results);
-
-          const newerResults = await Promise.map(singlePageIndexers, function(
-            indexer
-          ) {
-            return indexer.indexSingle();
-          }).then(async results => {
-            return results;
-          });
-
-          Array.prototype.push.apply(newResults, newerResults);
-          return newResults;
-        }
-      });
-    } catch (e) {
-      console.error("Error has accured", e);
-    }
-  }
-
-  prepareIndexers(pageNr) {
-    const indexers = [];
-    let lastPageNumber;
-    if (pageNr) {
-      for (
-        let index = Number(pageNr[0]);
-        index <= Number(pageNr[0]) + 5;
-        index++
-      ) {
-        lastPageNumber = index;
-        const newOlxUrl = {
-          url: this.olxUrl.url.replace(/\d+$/, "") + index,
-          email: this.olxUrl.email,
-          uuid: this.olxUrl.uuid,
-          hrefs: this.olxUrl.hrefs
-        };
-        indexers.push(new Indexer(newOlxUrl));
-      }
-    } else {
-      for (let index = 1; index <= 5; index++) {
-        lastPageNumber = index;
-        const newOlxUrl = {
-          url: this.olxUrl.url + index,
-          email: this.olxUrl.email,
-          uuid: this.olxUrl.uuid,
-          hrefs: this.olxUrl.hrefs
-        };
-        indexers.push(new Indexer(newOlxUrl));
-      }
-    }
-    return {
-      indexers: indexers,
-      lastPageNumber: lastPageNumber
-    };
-  }
-
-  prepareHrefIndexers(results) {
-    const indexers = [];
-
-    if (!Array.isArray(results)) {
-      results.hrefs.forEach(href => {
-        const newOlxUrl = {
-          url: href,
-          email: results.olxUrl.email,
-          uuid: results.olxUrl.uuid,
-          hrefs: this.olxUrl.hrefs
-        };
-
-        indexers.push(new Indexer(newOlxUrl));
-      });
-    } else {
-      results.forEach(result => {
-        if (result !== null && result.hasOwnProperty("hrefs")) {
-          result.hrefs.forEach(href => {
-            const newOlxUrl = {
-              url: href,
-              email: result.olxUrl.email,
-              uuid: result.olxUrl.uuid,
-              hrefs: this.olxUrl.hrefs
-            };
-
-            indexers.push(new Indexer(newOlxUrl));
-          });
-        }
-      });
-    }
-
-    return indexers;
-  }
-
-  async indexPage(pageNumber) {
-    try {
-      const res = await fetch(this.olxUrl.url);
-      const body = await res.text();
-      const $ = cheerio.load(body);
-      const hrefs = [];
-      let hasResults = false;
-
-      $("#rezultatipretrage")
-        .find(".listitem")
-        .each((i, elem) => {
-          hasResults = true;
-          const href = $(elem)
-            .find("a")
-            .first()
-            .attr("href");
-          hrefs.push(href);
-        });
-      return {
-        hrefs: hrefs,
-        hasResults: hasResults,
-        pageNumber: pageNumber,
-        olxUrl: this.olxUrl
-      };
-    } catch (e) {
-      console.error("Exception caught:" + e);
-    }
-  }
-
-  async indexSingle() {
-    try {
-      if (this.olxUrl.url === undefined) {
-        return {};
-      }
-
-      // if (global.hrefs) {
-
-      if (
-        this.olxUrl.hrefs[this.olxUrl.uuid] &&
-        this.olxUrl.hrefs[this.olxUrl.uuid].includes(this.olxUrl.url)
-      ) {
-        return null;
-      }
-      // }
-
-      const res = await fetch(this.olxUrl.url);
-      const body = await res.text();
-      const $ = cheerio.load(body);
-
-      const title = $("#naslovartikla")
-        .text()
-        .trim();
-      const realEstateType = $(
-        "#artikal_glavni_div > div.artikal_lijevo > div:nth-child(3) > div > span:nth-child(3) > a > span"
-      ).text();
-
-      const price = $("#pc > p:nth-child(2)").text();
-      const size = $("#dodatnapolja1 > div:nth-child(1) > div.df2").text();
-      const rooms = $("#dodatnapolja1 > div:nth-child(2) > div.df2").text();
-      const address = $("#dodatnapolja1 > div:nth-child(5) > div.df2").text();
-      const gardenSize = $(
-        "#dodatnapolja1 > div:nth-child(6) > div.df2"
-      ).text();
-      const location = $(
-        "#artikal_glavni_div > div.artikal_lijevo > div.op.pop.mobile-lokacija"
-      ).attr("data-content");
-
-      const time = $("time").attr("datetime");
-      const olxId = $(
-        "#artikal_glavni_div > div.artikal_lijevo > div:nth-child(15) > div:nth-child(4) > div.df2"
-      ).text();
-
-      const descriptions = $(".artikal_detaljniopis_tekst");
-      const latLngRe = /LatLng\(([0-9]+\.[0-9]+)\,\s+([0-9]+\.[0-9]+)\)/g;
-      const imgRe = /href":("[^"]*")/g;
-      const matches = latLngRe.exec(body);
-      let lng = "",
-        lat = "";
-      const parsePrice = price => parseFloat(price.replace(".", ""));
-
-      if (matches && matches.length >= 3) {
-        lat = matches[1];
-        lng = matches[2];
-      }
-
-      const parsedPrice = parsePrice(price);
-
-      const locationArray =
-        location && location.length > 0 ? location.split(",") : [];
-      const region = locationArray.length > 0 ? locationArray[0] : "";
-      const municipality = locationArray.length > 1 ? locationArray[1] : "";
-
-      const data = {
-        realEstateType: this.getCategoryId(realEstateType),
-        email: this.olxUrl.email,
-        uuid: this.olxUrl.uuid,
-        olxId: olxId,
-        url: this.olxUrl.url,
-        title,
-        price: isNaN(parsedPrice) ? 0 : parsedPrice,
-        size: parseFloat(size),
-        gardenSize: isNaN(parseFloat(gardenSize)) ? 0 : parseFloat(gardenSize),
-        address,
-        region,
-        municipality,
-        time,
-        shortDescription: descriptions.first().text(),
-        longDescription: descriptions.last().text(),
-        lat,
-        lng,
-        loc: [parseFloat(lat), parseFloat(lng)]
-      };
-
-      return data;
-    } catch (e) {
-      console.error("Exception caught: " + e.message);
-    }
-
-    return null;
-  }
-
-  getCategoryId(category) {
-    switch (category) {
-      case "Stanovi":
-        return "stan";
-
-      case "Vikendice":
-        return "vikendica";
-
-      case "Kuće":
-        return "kuca";
-
-      default:
-        return "";
-    }
-  }
-}

app/helpers/db/realEstate.js

@@ -0,0 +1,38 @@
+"use strict";
+const db = require("../../models/index");
+
+const bulkUpsertRealEstates = async realEstateData => {
+  try {
+    const fieldsToUpdateIfDuplicate = [
+      "realEstateType",
+      "adType",
+      "price",
+      "area",
+      "streetNumber",
+      "streetName",
+      "locality",
+      "municipality",
+      "city",
+      "region",
+      "entity",
+      "country",
+      "locationLat",
+      "locationLong",
+      "title",
+      "shortDescription",
+      "longDescription",
+      "gardenSize",
+      "adStatus",
+      "updatedAt"
+    ];
+    return await db.RealEstate.bulkCreate(realEstateData, {
+      updateOnDuplicate: fieldsToUpdateIfDuplicate
+    });
+  } catch (e) {
+    console.log("Error bulk upserting realEstates : ", e);
+  }
+};
+
+module.exports = {
+  bulkUpsertRealEstates
+};

app/migrations/20190916160603-add-title-column-to-realEstates.js

@@ -0,0 +1,13 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.addColumn("RealEstates", "title", {
+      type: Sequelize.STRING
+    });
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn("RealEstates", "title");
+  }
+};

app/migrations/20190916230229-add-description-columns-to-realEstates.js

@@ -0,0 +1,21 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.addColumn("RealEstates", "shortDescription", {
+        type: Sequelize.STRING
+      }),
+      queryInterface.addColumn("RealEstates", "longDescription", {
+        type: Sequelize.STRING
+      })
+    ]);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.removeColumn("RealEstates", "shortDescription"),
+      queryInterface.removeColumn("RealEstates", "longDescription")
+    ]);
+  }
+};

app/migrations/20190916231241-add-status-column-to-realEstates.js

@@ -0,0 +1,13 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.addColumn("RealEstates", "adStatus", {
+      type: Sequelize.INTEGER
+    });
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn("RealEstates", "adStatus");
+  }
+};

app/migrations/20190917090318-add-composite-key-to-realEstates.js

@@ -0,0 +1,21 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.addConstraint(
+      "RealEstates",
+      ["originAgencyName", "agencyObjectId"],
+      {
+        type: "unique",
+        name: "agencyNameObjectIdUniqueKey"
+      }
+    );
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.removeConstraint(
+      "RealEstates",
+      "agencyNameObjectIdUniqueKey"
+    );
+  }
+};

app/migrations/20190917101052-remove-lastTimeCrawled-column-from-realEstates.js

@@ -0,0 +1,14 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return queryInterface.removeColumn("RealEstates", "lastTimeCrawled");
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return queryInterface.addColumn("RealEstates", "lastTimeCrawled", {
+      type: Sequelize.DATE,
+      notNull: true
+    });
+  }
+};

app/migrations/20190917102437-remove-deleted-sold-columns-from-realEstates.js

@@ -0,0 +1,23 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.removeColumn("RealEstates", "deleted"),
+      queryInterface.removeColumn("RealEstates", "sold")
+    ]);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.addColumn("RealEstates", "deleted", {
+        type: Sequelize.BOOLEAN,
+        notNull: true
+      }),
+      queryInterface.addColumn("RealEstates", "sold", {
+        type: Sequelize.BOOLEAN,
+        notNull: true
+      })
+    ]);
+  }
+};

app/migrations/20190917115804-change-title-short-long-description-columns-in-realEstates.js

@@ -0,0 +1,21 @@
+"use strict";
+
+module.exports = {
+  up: (queryInterface, Sequelize) => {
+    return Promise.all([
+      queryInterface.changeColumn("RealEstates", "shortDescription", {
+        type: Sequelize.TEXT
+      }),
+      queryInterface.changeColumn("RealEstates", "longDescription", {
+        type: Sequelize.TEXT
+      }),
+      queryInterface.changeColumn("RealEstates", "title", {
+        type: Sequelize.TEXT
+      })
+    ]);
+  },
+
+  down: (queryInterface, Sequelize) => {
+    return Promise.all([]);
+  }
+};

app/models/realEstate.js

@@ -12,13 +12,15 @@ module.exports = (sequelize, DataTypes) => {
       type: DataTypes.TEXT,
       allowNull: false
     },
-    agencyObjectId: {
-      type: DataTypes.TEXT,
-      allowNull: false
-    },
     originAgencyName: {
       type: DataTypes.TEXT,
-      allowNull: false
+      allowNull: false,
+      unique: true
+    },
+    agencyObjectId: {
+      type: DataTypes.TEXT,
+      allowNull: false,
+      unique: true
     },
     realEstateType: {
       type: DataTypes.TEXT,
@@ -45,14 +47,10 @@ module.exports = (sequelize, DataTypes) => {
       type: DataTypes.DATE,
       allowNull: false
     },
-    deleted: {
-      type: DataTypes.BOOLEAN,
-      allowNull: false
-    },
-    sold: {
-      type: DataTypes.BOOLEAN,
-      allowNull: false
-    }
+    title: DataTypes.TEXT,
+    shortDescription: DataTypes.TEXT,
+    longDescription: DataTypes.TEXT,
+    adStatus: DataTypes.INTEGER
   });
 
   RealEstate.associate = models => {

app/services/crawlerService.js

@@ -1,77 +0,0 @@
-const Promise = require("bluebird");
-const OlxCrawler = require("../helpers/crawlers/olxClawler");
-const db = require("../models/index");
-const { allMarketAlerts } = require("../helpers/db/dbHelper");
-
-async function crawlAll() {
-  try {
-    const marketAlertsFromDb = await allMarketAlerts(true);
-    const hrefs = [];
-
-    marketAlertsFromDb.map(marketAlert => {
-      if (hrefs[marketAlert.request] === undefined) {
-        hrefs[marketAlert.request] = [];
-      }
-
-      hrefs[marketAlert.request].push(marketAlert.url);
-    });
-
-    const olxCrawler = new OlxCrawler(hrefs);
-
-    const crawlers = [olxCrawler];
-
-    return Promise.map(crawlers, function(crawler) {
-      return crawler.crawl();
-    }).then(async results => {
-      try {
-        const marketAlertsFromDb = await allMarketAlerts(false, true);
-
-        const marketAlerts = [];
-        const mergedResults = [].concat.apply([], results);
-
-        for (const result of mergedResults) {
-          marketAlerts.push({
-            url: result.url,
-            realestateOrigin: "OLX",
-            originId: 1,
-            size: result.size,
-            price: result.price,
-            email: result.email,
-            request: result.uuid,
-            municipality: result.municipality,
-            region: result.region,
-            gardenSize: isNaN(result.gardenSize) ? 0 : result.gardenSize,
-            realEstateType: result.realEstateType,
-            title: result.title,
-            notified: false,
-            hasLocation: result.hasLocation
-          });
-        }
-
-        try {
-          const filteredMarketAlerts = marketAlerts.filter(
-            elem =>
-              !marketAlertsFromDb.find(({ url, request }) => {
-                return elem.url === url && elem.request === request;
-              })
-          );
-
-          await db.MarketAlert.bulkCreate(filteredMarketAlerts);
-        } catch (e) {
-          console.log(
-            "CRAWLER SERVICE: Could not bulkCreate marketalers reason: ",
-            e
-          );
-        }
-      } catch (e) {
-        console.log(
-          "CRAWLER SERVICE: Error crawling. Trying next crawler! ",
-          e
-        );
-      }
-    });
-  } catch (e) {
-    console.error("CRAWLER SERVICE:could not fetch marketalerts ", e);
-  }
-}
-module.exports = crawlAll;

development.env

@@ -13,3 +13,11 @@ AMAZON_SECRET_ACCESS_KEY=(your-key-here)
 AMAZON_REGION=eu-west-1
 APP_URL=http://localhost:3001
 SOURCE_EMAIL=info@saburly.com
+
+#=============== CRAWLER SETTINGS===============#
+#==OLX==
+OLX_START_PAGE=Crawler starts from this page
+OLX_END_PAGE=Crawler ends with this page (including this page)
+OLX_MAX_RESULTS_PER_PAGE=Only this number or less results from one page will be scraped and saved
+OLX_CRAWLER_AD_TYPE=enum name of what type of ads should be crawled, check common/enums.js file for valid values
+OLX_CRAWLER_AD_CATEGORIES=comma separated list of enum names of categories to be included, check common/enums.js file for valid values

package-lock.json

@@ -53,11 +53,6 @@
         "@types/node": "*"
       }
     },
-    "@types/geojson": {
-      "version": "1.0.6",
-      "resolved": "https://registry.npmjs.org/@types/geojson/-/geojson-1.0.6.tgz",
-      "integrity": "sha512-Xqg/lIZMrUd0VRmSRbCAewtwGZiAk3mEUDvV4op1tGl+LvyPcb/MIOSxTl9z+9+J+R4/vpjiCAT4xeKzH9ji1w=="
-    },
     "@types/node": {
       "version": "11.11.1",
       "resolved": "https://registry.npmjs.org/@types/node/-/node-11.11.1.tgz",
@@ -126,6 +121,11 @@
         "color-convert": "^1.9.0"
       }
     },
+    "any-promise": {
+      "version": "1.3.0",
+      "resolved": "https://registry.npmjs.org/any-promise/-/any-promise-1.3.0.tgz",
+      "integrity": "sha1-q8av7tzqUugJzcA3au0845Y10X8="
+    },
     "anymatch": {
       "version": "2.0.0",
       "resolved": "https://registry.npmjs.org/anymatch/-/anymatch-2.0.0.tgz",
@@ -1924,11 +1924,6 @@
         }
       }
     },
-    "generic-pool": {
-      "version": "3.5.0",
-      "resolved": "https://registry.npmjs.org/generic-pool/-/generic-pool-3.5.0.tgz",
-      "integrity": "sha512-dEkxmX+egB2o4NR80c/q+xzLLzLX+k68/K8xv81XprD+Sk7ZtP14VugeCz+fUwv5FzpWq40pPtAkzPRqT8ka9w=="
-    },
     "get-caller-file": {
       "version": "2.0.5",
       "resolved": "https://registry.npmjs.org/get-caller-file/-/get-caller-file-2.0.5.tgz",
@@ -3419,12 +3414,11 @@
       "dev": true
     },
     "retry-as-promised": {
-      "version": "2.3.2",
-      "resolved": "https://registry.npmjs.org/retry-as-promised/-/retry-as-promised-2.3.2.tgz",
-      "integrity": "sha1-zZdO5P2bX+A8vzGHHuSCIcB3N7c=",
+      "version": "3.2.0",
+      "resolved": "https://registry.npmjs.org/retry-as-promised/-/retry-as-promised-3.2.0.tgz",
+      "integrity": "sha512-CybGs60B7oYU/qSQ6kuaFmRd9sTZ6oXSc0toqePvV74Ac6/IFZSI1ReFQmtCN+uvW1Mtqdwpvt/LGOiCBAY2Mg==",
       "requires": {
-        "bluebird": "^3.4.6",
-        "debug": "^2.6.9"
+        "any-promise": "^1.3.0"
       }
     },
     "safe-buffer": {
@@ -3486,41 +3480,44 @@
       }
     },
     "sequelize": {
-      "version": "4.43.2",
-      "resolved": "https://registry.npmjs.org/sequelize/-/sequelize-4.43.2.tgz",
-      "integrity": "sha512-EA3V1AsxVjf2EtGbdEoa9Fe5rSAqy5g4OsX0VwtU6iMezTjIYTCXV8o6mG7i6u3lu4Zc7JWZ6XwhS0k79pT/EQ==",
+      "version": "5.18.4",
+      "resolved": "https://registry.npmjs.org/sequelize/-/sequelize-5.18.4.tgz",
+      "integrity": "sha512-bBmJqpO1H8Z7L0xzITqVo5KHXFI7GmKfGl/5SIPDKsuUMbuZT98s+gyGeaLXpOWGH1ZUO79hvJ8z74vNcxBWHg==",
       "requires": {
         "bluebird": "^3.5.0",
         "cls-bluebird": "^2.1.0",
-        "debug": "^3.1.0",
-        "depd": "^1.1.0",
+        "debug": "^4.1.1",
         "dottie": "^2.0.0",
-        "generic-pool": "3.5.0",
         "inflection": "1.12.0",
-        "lodash": "^4.17.1",
-        "moment": "^2.20.0",
-        "moment-timezone": "^0.5.14",
-        "retry-as-promised": "^2.3.2",
-        "semver": "^5.5.0",
-        "terraformer-wkt-parser": "^1.1.2",
+        "lodash": "^4.17.11",
+        "moment": "^2.24.0",
+        "moment-timezone": "^0.5.21",
+        "retry-as-promised": "^3.1.0",
+        "semver": "^6.1.1",
+        "sequelize-pool": "^2.3.0",
         "toposort-class": "^1.0.1",
         "uuid": "^3.2.1",
-        "validator": "^10.4.0",
-        "wkx": "^0.4.1"
+        "validator": "^10.11.0",
+        "wkx": "^0.4.6"
       },
       "dependencies": {
         "debug": {
-          "version": "3.2.6",
-          "resolved": "https://registry.npmjs.org/debug/-/debug-3.2.6.tgz",
-          "integrity": "sha512-mel+jf7nrtEl5Pn1Qx46zARXKDpBbvzezse7p7LqINmdoIk8PYP5SySaxEmYv6TZ0JyEKA1hsCId6DIhgITtWQ==",
+          "version": "4.1.1",
+          "resolved": "https://registry.npmjs.org/debug/-/debug-4.1.1.tgz",
+          "integrity": "sha512-pYAIzeRo8J6KPEaJ0VWOh5Pzkbw/RetuzehGM7QRRX5he4fPHx2rdKMB256ehJCkX+XRQm16eZLqLNS8RSZXZw==",
           "requires": {
             "ms": "^2.1.1"
           }
         },
         "ms": {
-          "version": "2.1.1",
-          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.1.tgz",
-          "integrity": "sha512-tgp+dl5cGk28utYktBsrFqA7HKgrhgPsg6Z/EfhWI4gl1Hwq8B/GmY/0oXZ6nF8hDVesS/FpnYaD/kOWhYQvyg=="
+          "version": "2.1.2",
+          "resolved": "https://registry.npmjs.org/ms/-/ms-2.1.2.tgz",
+          "integrity": "sha512-sGkPx+VjMtmA6MX27oA4FBFELFCZZ4S4XqeGOXCv68tT+jb3vk/RyaKWP0PTKyWtmLSM0b+adUTEvbs1PEaH2w=="
+        },
+        "semver": {
+          "version": "6.3.0",
+          "resolved": "https://registry.npmjs.org/semver/-/semver-6.3.0.tgz",
+          "integrity": "sha512-b39TBaTSfV6yBrapU89p5fKekE2m/NwnDocOVruQFS1/veMgdzuPcnOM34M6CwxW8jH/lxEa5rBoDeUwu5HHTw=="
         }
       }
     },
@@ -3539,6 +3536,11 @@
         "yargs": "^13.1.0"
       }
     },
+    "sequelize-pool": {
+      "version": "2.3.0",
+      "resolved": "https://registry.npmjs.org/sequelize-pool/-/sequelize-pool-2.3.0.tgz",
+      "integrity": "sha512-Ibz08vnXvkZ8LJTiUOxRcj1Ckdn7qafNZ2t59jYHMX1VIebTAOYefWdRYFt6z6+hy52WGthAHAoLc9hvk3onqA=="
+    },
     "serve-static": {
       "version": "1.13.2",
       "resolved": "https://registry.npmjs.org/serve-static/-/serve-static-1.13.2.tgz",
@@ -3904,23 +3906,6 @@
         }
       }
     },
-    "terraformer": {
-      "version": "1.0.9",
-      "resolved": "https://registry.npmjs.org/terraformer/-/terraformer-1.0.9.tgz",
-      "integrity": "sha512-YlmQ1fsMWTkKGDGibCRWgmLzrpDRUr63Q025LJ/taYQ6j1Yb8q9McKF7NBi6ACAyUXO6F/bl9w6v4MY307y5Ag==",
-      "requires": {
-        "@types/geojson": "^1.0.0"
-      }
-    },
-    "terraformer-wkt-parser": {
-      "version": "1.2.0",
-      "resolved": "https://registry.npmjs.org/terraformer-wkt-parser/-/terraformer-wkt-parser-1.2.0.tgz",
-      "integrity": "sha512-QU3iA54St5lF8Za1jg1oj4NYc8sn5tCZ08aNSWDeGzrsaV48eZk1iAVWasxhNspYBoCqdHuoot1pUTUrE1AJ4w==",
-      "requires": {
-        "@types/geojson": "^1.0.0",
-        "terraformer": "~1.0.5"
-      }
-    },
     "through": {
       "version": "2.3.8",
       "resolved": "https://registry.npmjs.org/through/-/through-2.3.8.tgz",
@@ -4296,9 +4281,9 @@
       }
     },
     "wkx": {
-      "version": "0.4.6",
-      "resolved": "https://registry.npmjs.org/wkx/-/wkx-0.4.6.tgz",
-      "integrity": "sha512-LHxXlzRCYQXA9ZHgs8r7Gafh0gVOE8o3QmudM1PIkOdkXXjW7Thcl+gb2P2dRuKgW8cqkitCRZkkjtmWzpHi7A==",
+      "version": "0.4.8",
+      "resolved": "https://registry.npmjs.org/wkx/-/wkx-0.4.8.tgz",
+      "integrity": "sha512-ikPXMM9IR/gy/LwiOSqWlSL3X/J5uk9EO2hHNRXS41eTLXaUFEVw9fn/593jW/tE5tedNg8YjT5HkCa4FqQZyQ==",
       "requires": {
         "@types/node": "*"
       }

package.json

@@ -10,7 +10,8 @@
     "migrate": "cd app && npx sequelize db:migrate",
     "setup": "docker build -t marketalerts .  && docker run -e POSTGRES_USER=docker -e POSTGRES_PASSWORD=docker -e POSTGRES_DB=marketalerts --name pg_marketalerts -d -p 5432:5432 marketalerts && sleep 4 && npm run migrate",
     "docker-start": "docker start pg_marketalerts",
-    "docker-stop": "docker stop pg_marketalerts"
+    "docker-stop": "docker stop pg_marketalerts",
+    "crawl": "cd app/crawler && node crawl.js"
   },
   "repository": {
     "type": "git",
@@ -37,7 +38,7 @@
     "node-schedule": "^1.3.2",
     "pg": "^7.10.0",
     "react-step-wizard": "^5.1.0",
-    "sequelize": "^4.43.2",
+    "sequelize": "^5.18.4",
     "sequelize-cli": "^5.5.0"
   },
   "devDependencies": {