Files
old-web/app/crawler/specificCrawlers/saljic.js
2020-01-31 00:55:24 +01:00

686 lines
20 KiB
JavaScript

"use strict";
const fetch = require("node-fetch");
const cheerio = require("cheerio");
const moment = require("moment-timezone");
const {
AD_TYPE,
AD_CATEGORY,
AD_AGENCY,
AD_STATUS,
CRAWLER_AD_TYPE,
FURNISHING_TYPE,
HEATING_TYPE
} = require("../../common/enums");
const {
PRINT_CRAWLER_DEBUG,
DEFAULT_TIMEZONE
} = require("../../config/appConfig");
const { SALJIC_FORCE_CRAWL } = require("../specificConfigs/saljic");
const SALJIC_ENUMS = {
SALJIC_AD_TYPE: {
[CRAWLER_AD_TYPE.ALL]: "&input_vrsta=",
[CRAWLER_AD_TYPE.ONLY_SELL]: "&input_vrsta=1",
[CRAWLER_AD_TYPE.ONLY_RENT]: "&input_vrsta=2"
},
SALJIC_AD_CATEGORY: {
[AD_CATEGORY.ALL.id]: "&input_kategorija=",
[AD_CATEGORY.FLAT.id]: "&input_kategorija=15",
[AD_CATEGORY.HOUSE.id]: "&input_kategorija=9",
[AD_CATEGORY.LAND.id]: "&input_kategorija=5", //3 and 4 also gradjevinsko
[AD_CATEGORY.OFFICE.id]: "&input_kategorija=8",
[AD_CATEGORY.APARTMENT.id]: "&input_kategorija=1",
[AD_CATEGORY.GARAGE.id]: "&input_kategorija=2"
//[AD_CATEGORY.COTTAGE.id]: ""
}
};
class SaljicCrawler {
constructor(
savers = [],
crawlerAdTypes = CRAWLER_AD_TYPE.ALL,
crawlerAdCategories = [AD_CATEGORY.FLAT, AD_CATEGORY.HOUSE],
maxPages = 5000,
maxResultsPerPage = 5000,
ignoredUsernames = [],
delayBetweenPages = 1000
) {
this.savers = savers;
this.baseUrl = "https://www.saljicnekretnine.ba/v2/nekretnine_search";
this.crawlerAdTypes = crawlerAdTypes;
this.crawlerAdCategories = crawlerAdCategories;
this.maxResultsPerPage = maxResultsPerPage;
this.delayBetweenPages = delayBetweenPages;
}
async crawl() {
const crawlAdCategories = this.crawlerAdCategories;
const newRealEstates = [];
if (crawlAdCategories) {
const indexGenerators = [];
for (const adCategory of crawlAdCategories) {
indexGenerators.push(this.categoryIndexer(adCategory));
}
//
//console.log(indexGenerators);
//
let done = false;
while (!done) {
const categoryIndexerPromises = [];
const generatorsToRemove = [];
for (const indexGenerator of indexGenerators) {
categoryIndexerPromises.push(indexGenerator.next());
generatorsToRemove.push(false);
}
const singlePageResults = await Promise.all(categoryIndexerPromises);
const entries = singlePageResults.entries();
for (const [index, { value: singlePageResult }] of entries) {
if (singlePageResult) {
const saveResults = await this.saveCrawledResults(singlePageResult);
const { newRecords } = saveResults;
newRealEstates.push(...newRecords);
if (
Array.isArray(newRecords) &&
newRecords.length === 0 &&
!SALJIC_FORCE_CRAWL
) {
generatorsToRemove[index] = true;
}
} else {
//Generator returned undefined, remove this generator from array
generatorsToRemove[index] = true;
// console.log("Generator ", index + 1, "has no more pages");
}
}
// console.log("Generators state : ", generatorsToRemove);
for (let i = generatorsToRemove.length - 1; i >= 0; i--) {
if (generatorsToRemove[i]) {
// console.log("\tRemove generator ", i + 1);
indexGenerators.splice(i, 1);
}
}
if (indexGenerators.length === 0) {
done = true;
}
await this.sleep(this.delayBetweenPages);
}
}
return newRealEstates;
}
async *categoryIndexer(adCategory) {
let pageToIndex = 1;
const urlAdTypePart = SALJIC_ENUMS.SALJIC_AD_TYPE[this.crawlerAdTypes];
const urlCategoryPart = SALJIC_ENUMS.SALJIC_AD_CATEGORY[adCategory];
if (urlAdTypePart !== undefined && urlCategoryPart !== undefined) {
while (true) {
const urlPagePart = pageToIndex === 1 ? "" : (pageToIndex - 1) * 2 * 11;
const urlPageToCrawl = `${this.baseUrl}?order_by=${urlAdTypePart}${urlCategoryPart}&per_page=${urlPagePart}`;
const singlePageResults = await this.indexSinglePage(
urlPageToCrawl,
this.maxResultsPerPage
);
if (Array.isArray(singlePageResults) && singlePageResults.length > 0) {
yield singlePageResults;
} else {
return undefined;
}
++pageToIndex;
if (pageToIndex === this.maxPages) {
return undefined;
}
}
} else {
return undefined;
}
}
async indexSinglePage(url, maxResultsPerPage) {
if (PRINT_CRAWLER_DEBUG) {
console.log("[SALJIC] Index page : ", url);
}
try {
const res = await fetch(url);
const body = await res.text();
const $ = cheerio.load(body);
let hrefs = [];
$("#shop")
.find(".product")
.each((i, elem) => {
const href = $(elem)
.find("a")
.first()
.attr("href");
if (href) {
hrefs.push(href);
}
});
//Converting to absolute URLs
const hrefsAbs = hrefs.map(link => {
return "https://www.saljicnekretnine.ba" + link;
});
let actualNoOfResults =
hrefsAbs.length <= maxResultsPerPage
? hrefsAbs.length
: maxResultsPerPage;
const asyncScraping = [];
for (let i = 0; i < actualNoOfResults; i++) {
asyncScraping.push(this.scrapeAd(hrefsAbs[i]));
}
const scrapedData = await Promise.all(asyncScraping);
const filteredScrapedData = scrapedData.filter(adData => !!adData);
return filteredScrapedData;
} catch (e) {
console.error("[SALJIC] Exception caught:" + e);
return [];
}
}
async scrapeAd(url) {
console.log("[SALJIC] Scraping : ", url);
try {
const adPageSource = await fetch(url);
const body = await adPageSource.text();
const $ = cheerio.load(body);
// ??? treba li nesto za status
let status = AD_STATUS.STATUS_NORMAL;
const propertySelectors = {
title:
"div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.entry-title > h2",
price:
"div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.topmargin-sm.single-product > div.product > div.product-price > ins",
streetName:
"div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.entry-content.topmargin > p",
descriptions:
"div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.entry-content.topmargin > div.toggle.toggle-bg > div.togglec >p:nth-child(1)",
latAndLong:
"div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.entry-content.topmargin > div.gmap.bottommargin > iframe"
};
const title = $(propertySelectors.title)
.text()
.replace(/(\r\n|\n|\r)/gm, "")
.replace(/ {1,}/g, " ")
.trim();
console.log("Title:", title);
const priceText = $(propertySelectors.price)
.text()
.replace(/(\r\n|\n|\r)/gm, "")
.replace(/ {1,}/g, " ")
.trim();
const price =
priceText === "CIJENA NA UPIT"
? null
: parseFloat(
priceText.substring(8, priceText.length - 3).replace(",", "")
);
console.log("Price:", price);
const streetName = $(propertySelectors.streetName)
.text()
.replace(/(\r\n|\n|\r)/gm, "")
.trim();
console.log("Street:", streetName);
const descriptions = $(propertySelectors.descriptions)
.text()
.trim();
console.log("Description:", descriptions);
const latAndLongSrc = $(propertySelectors.latAndLong).attr("src");
const latText = latAndLongSrc.substring(
latAndLongSrc.indexOf("marker=") + 7,
latAndLongSrc.indexOf("%2C", latAndLongSrc.indexOf("marker="))
);
const longText = latAndLongSrc.substring(
latAndLongSrc.indexOf("%2C", latAndLongSrc.indexOf("marker=")) + 3,
latAndLongSrc.length
);
const locationLat = parseFloat(latText) || null;
const locationLong = parseFloat(longText) || null;
console.log("Lat:", locationLat);
console.log("Long:", locationLong);
//====== DETAIL INFORMATION FIELDS ==========
let area,
gardenSize,
numberOfRooms = null,
numberOfFloors = null,
floor = null,
accessRoadType = null,
heatingType = null,
furnishingType = null,
balcony = null,
newBuilding = null,
elevator = null,
water = null,
electricity = null,
drainageSystem = null,
registeredInZkBooks = null,
recentlyAdapted = null,
parking = null,
garage = null,
gas = null,
antiTheftDoor = null,
airCondition = null,
phoneConnection = null,
cableTV = null,
internet = null,
basementAttic = null,
storeRoom = null,
videoSurveillance = null,
alarm = null,
suitableForStudents = null,
includingBills = null,
animalsAllowed = null,
pool = null,
urbanPlanPermit = null,
buildingPermit = null,
utilityConnection = null,
distanceToRiver = null;
let publishedDate = null;
let renewedDate = null;
//Extracting data - Glavne karakteristike
let mainFieldIndex = 1;
do {
const mainFieldSelector = `div.content-wrap > div.container > div.col-md-8.nobottommargin > div.single-post > div.entry > div.entry-content.topmargin > div.col-md-12.bottommargin > ul > li.list-group-item:nth-child(${mainFieldIndex})`;
const mainField = $(mainFieldSelector)
.text()
.replace(/[\n\r\t]/gm, "")
.trim();
const mainFieldTitle = mainField.substring(0, mainField.indexOf(" "));
const mainFieldValue = mainField
.substring(mainField.indexOf(" "), mainField.length)
.trim();
switch (mainFieldTitle) {
case "Površina":
area = parseFloat(
mainFieldValue.substring(0, mainFieldValue.indexOf(" "))
);
break;
case "Okućnica":
gardenSize = parseFloat(
mainFieldValue.substring(0, mainFieldValue.indexOf(" "))
);
break;
case "Broj soba":
numberOfRooms = parseInt(mainFieldValue);
break;
case "Broj spratova":
numberOfFloors = parseInt(mainFieldValue);
break;
case "Sprat":
floor = parseInt(mainFieldValue);
break;
case "Godina renoviranja":
recentlyAdapted = true;
break;
case "Broj parking mjesta":
`${month}/${day}/${year}`;
parking = true;
break;
case "Dostupno od":
const day = mainFieldValue.substring(0, 2);
const month = mainFieldValue.substring(3, 5);
const year = mainFieldValue.substring(6, mainFieldValue.length);
console.log(`${month}/${day}/${year}`);
publishedDate = new Date(`${month}/${day}/${year}`);
break;
default:
// console.log(fieldTitle, " = ", fieldValue);
break;
}
if (mainFieldTitle === "") {
break;
}
mainFieldIndex++;
} while (true);
console.log("Area:", area);
console.log("Garden size:", gardenSize);
console.log("Number of rooms:", numberOfRooms);
console.log("Number of floors", numberOfFloors);
console.log("Floor:", floor);
console.log("Adapted:", recentlyAdapted);
console.log("Parking:", parking);
console.log("Published date:", publishedDate);
//const category = $(propertySelectors.category)
//.text()
//.trim();
const data = {
url,
agencyObjectId: olxId,
originAgencyName: AD_AGENCY.OLX,
realEstateType: parsedCategory,
adType: parsedAdType,
title,
price: parsedPrice,
area: parsedArea,
gardenSize: parsedGardenSize,
shortDescription: descriptions
.first()
.text()
.trim(),
longDescription: descriptions
.last()
.text()
.trim(),
streetNumber: 0,
streetName: "",
locality: "",
municipality: "",
city: "",
region: "",
entity: "",
country: "",
locationLat,
locationLong,
adStatus: status,
publishedDate: publishedDateMoment.toISOString(),
renewedDate: renewedDateMoment.toISOString(),
numberOfRooms,
numberOfFloors,
floor,
accessRoadType,
heatingType,
furnishingType,
balcony,
newBuilding,
elevator,
water,
electricity,
drainageSystem,
registeredInZkBooks,
recentlyAdapted,
parking,
garage,
gas,
antiTheftDoor,
airCondition,
phoneConnection,
cableTV,
internet,
basementAttic,
storeRoom,
videoSurveillance,
alarm,
suitableForStudents,
includingBills,
animalsAllowed,
pool,
urbanPlanPermit,
buildingPermit,
utilityConnection,
distanceToRiver,
numberOfViewsAgency
};
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.FLAT.id;
case "Zemljišta":
return AD_CATEGORY.LAND.id;
case "Kuće":
return AD_CATEGORY.HOUSE.id;
case "Poslovni prostori":
return AD_CATEGORY.OFFICE.id;
case "Apartmani":
return AD_CATEGORY.APARTMENT.id;
case "Garaže":
return AD_CATEGORY.GARAGE.id;
case "Vikendice":
return AD_CATEGORY.COTTAGE.id;
default:
return undefined;
}
}
getAdTypeId(adTypeText) {
switch (adTypeText) {
case "Prodaja":
return AD_TYPE.AD_TYPE_SALE.stringId;
case "Izdavanje":
return AD_TYPE.AD_TYPE_RENT.stringId;
case "Potražnja":
return AD_TYPE.AD_TYPE_REQUEST.stringId;
default:
return undefined;
}
}
getHeatingTypeId(heatingTypeText) {
switch (heatingTypeText) {
case "struja":
return HEATING_TYPE.ELECTRICITY.id;
case "plin":
return HEATING_TYPE.GAS.id;
case "drva":
return HEATING_TYPE.WOOD.id;
case "centralno (gradsko)":
return HEATING_TYPE.CENTRAL_CITY.id;
case "centralno (kotlovnica)":
return HEATING_TYPE.CENTRAL_BOILER.id;
case "centralno (plin)":
return HEATING_TYPE.CENTRAL_GAS.id;
case "nije uvedeno":
return HEATING_TYPE.NO_HEATING.id;
case "ostalo":
return HEATING_TYPE.OTHER.id;
case "drugo":
return HEATING_TYPE.OTHER.id;
default:
console.log("grijanje = NEPOZNATO [", heatingTypeText, "]");
return null;
}
}
getFurnishingTypeId(furnishingTypeText) {
switch (furnishingTypeText) {
case "namješten":
return FURNISHING_TYPE.FURNISHED.id;
case "polunamješten":
return FURNISHING_TYPE.HALF_FURNISHED.id;
case "nenamješten":
return FURNISHING_TYPE.NOT_FURNISHED.id;
case "":
return FURNISHING_TYPE.FURNISHED.id;
default:
console.log("namješten = NEPOZNATO [", furnishingTypeText, "]");
return null;
}
}
getAccessRoadTypeId(accessRoadTypeText) {
switch (accessRoadTypeText) {
case "asfalt":
return ACCESS_ROAD_TYPE.ASPHALT.id;
case "beton":
return ACCESS_ROAD_TYPE.CONCRETE.id;
case "makadam":
return ACCESS_ROAD_TYPE.MACADAM.id;
case "ostalo":
return ACCESS_ROAD_TYPE.OTHER.id;
default:
console.log("pristup = NEPOZNATO [", accessRoadTypeText, "]");
return null;
}
}
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);
}
parseNumberOfRooms(numberOfRoomsText, categoryId) {
if (categoryId === AD_CATEGORY.FLAT.id) {
switch (numberOfRoomsText) {
case "garsonjera":
return 0;
case "jednosoban (1)":
return 1;
case "jednoiposoban (1.5)":
return 1.5;
case "dvosoban (2)":
return 2;
case "trosoban (3)":
return 3;
case "četverosoban (4)":
return 4;
case "petosoban i više":
return 5;
default:
console.log(
"broj soba [stan] = NEPOZNATO [",
numberOfRoomsText,
", ",
categoryId,
"]"
);
return null;
}
}
if (
categoryId === AD_CATEGORY.HOUSE.id ||
categoryId === AD_CATEGORY.COTTAGE.id ||
categoryId === AD_CATEGORY.APARTMENT.id ||
categoryId === AD_CATEGORY.OFFICE.id
) {
return parseInt(numberOfRoomsText) || null;
}
console.log("broj soba = NEPOZNATO [", numberOfRoomsText, "]");
return null;
}
parseNumberOfFloors(numberOfFloorsText, categoryId) {
if (
categoryId === AD_CATEGORY.HOUSE.id ||
categoryId === AD_CATEGORY.COTTAGE.id
) {
return parseInt(numberOfFloorsText) || null;
}
if (categoryId === AD_CATEGORY.OFFICE.id) {
if (
numberOfFloorsText === "suteren" ||
numberOfFloorsText === "prizemlje"
) {
return 0;
}
if (numberOfFloorsText === "6+") {
return 7;
}
return parseInt(numberOfFloorsText) || null;
}
console.log("broj spratova = NEPOZNATO [", numberOfFloorsText, "]");
return null;
}
parseFloorNumber(floorText, categoryId) {
if (
categoryId === AD_CATEGORY.FLAT.id ||
categoryId === AD_CATEGORY.APARTMENT.id
) {
if (
floorText === "suteren" ||
floorText === "prizemlje" ||
floorText === "visoko prizemlje"
) {
return 0;
}
return parseInt(floorText) || null;
}
if (categoryId === AD_CATEGORY.OFFICE.id) {
if (floorText === "zaseban objekat") {
return null;
}
if (floorText === "prizemlje" || floorText === "visoko prizemlje") {
return 0;
}
return parseInt(floorText) || null;
}
console.log("sprat = NEPOZNATO [", floorText, "]");
return null;
}
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);
// }
//For now, we use only Postgres saver, so ...
return savers[0].save(results);
//so that we can use some sequelize options and information when data is inserted
}
}
module.exports = SaljicCrawler;