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restaurant-search/scrape/scrape.js

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JavaScript
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#!/usr/bin/env node
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var cheerio = require('cheerio');
var request = require('request');
var url = require('url');
var path = require('path');
var fs = require('fs');
var _ = require('underscore');
function requestCached(relativeUrl, callback) {
var absoluteUrl = url.resolve('http://www.tripadvisor.com', relativeUrl);
var cachePath = path.join('cache', relativeUrl);
fs.readFile(cachePath, function(err, data) {
if (err) {
var stream = fs.createWriteStream(cachePath);
request(absoluteUrl, callback).pipe(stream);
}
else {
callback(null, null, data);
}
});
}
function getBarPercent(bar) {
var width = bar.css('width');
return parseInt(width) / 91.0;
}
function reviewScraped(err, resp, html) {
if (err) {
return console.error('Error: %s', err);
}
var $ = cheerio.load(html);
var bars = $('div.fill');
if (bars.length != 9) {
return;
}
var storeName = $('h1#HEADING').text().trim();
if (storeName.indexOf('CLOSED') != -1) {
return;
}
var rateFood = getBarPercent($(bars[5]));
var rateService = getBarPercent($(bars[6]));
var rateValue = getBarPercent($(bars[7]));
var rateAtmosphere = getBarPercent($(bars[8]));
if (rateFood == 0.0 && rateService == 0.0 && rateValue == 0.0 && rateAtmosphere == 0.0) {
return;
}
var data = {
'name': storeName,
'relativeUrl': this.relativeUrl,
'rating': {
'food': (rateFood - 0.5) * 2.0,
'service': (rateService - 0.5) * 2.0,
'value': (rateValue - 0.5) * 2.0,
'atmosphere': (rateAtmosphere - 0.5) * 2.0
}
};
this.callback(data);
}
function scrapeReview(relativeUrl, callback) {
console.log('Scraping review %s...', relativeUrl);
var c = _.bind(reviewScraped, {
callback: callback,
relativeUrl: relativeUrl
});
requestCached(relativeUrl, c);
}
function indexScraped(err, resp, html) {
if (err) {
return console.error('Error: %s', err);
}
var $ = cheerio.load(html);
var that = this;
var abort = false;
$('a.property_title').each(function(index, element) {
if (abort) {
return;
}
var reviewUrl = $(element).attr('href');
if (that.callback(reviewUrl)) {
abort = true;
}
});
if (!abort) {
var nextPageUrl = $('a.sprite-pageNext').attr('href');
if (nextPageUrl) {
scrapeIndices(nextPageUrl, this.callback);
}
}
}
function scrapeIndices(relativeUrl, callback) {
console.log('Scraping index %s...', relativeUrl);
var c = _.bind(indexScraped, { callback: callback });
requestCached(relativeUrl, c);
}
function main() {
var relativePath = '/Restaurants-g60763-New_York_City_New_York.html';
var databasePath = 'data.json';
var abort = false;
process.on('SIGINT', function() {
console.warn('Caught SIGINT, aborting...');
abort = true;
});
var results = [];
scrapeIndices(relativePath, function(relativeUrl) {
scrapeReview(relativeUrl, function(data) {
results.push(data);
});
return abort;
});
process.on('exit', function() {
var strData = JSON.stringify(results, null, 4);
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fs.writeFileSync(databasePath, strData);
});
}
if (require.main === module) {
main();
}