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craigslist-watcher.js
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craigslist-watcher.js
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process.chdir(__dirname);
// If the config file is not at ./config, it should be specified as the first argument to the script
var configPath = process.argv[2] || './config';
// Modules
var craigslistscraper = require('./craigslist-scraper'),
fs = require('node-fs'),
async = require('async'),
nodemailer = require('nodemailer'),
config = require(configPath);
// Variables
var baseUrl = '',
mailSenderEmail = config.from.email,
mailSenderPass = config.from.pass,
notifyEmail = config.to.email,
queries = [], // Search string,
queryResultSets = [],
dataPath = '',
dataDirName = 'craigslist-watcher',
dataFileName = 'data',
dataFilePath = '',
filename = __filename.replace(/.*\//, ''),
usage = '\ncraigslist-watcher - check Craigslist for new posts based on search terms and email new posts\n';
usage = usage + 'Usage: craigslist-watcher [options] CONFIG_PATH';
// Functions
function isEmpty(str) {
return (!str || 0 === str.length);
}
/**
* Given a result object, create some html of the results.
* @param {Array} results
* @return {String}
*/
function createResultHtml(termResultSet) {
var html = '<h2>Results for <span style="color:#000099">'
+ termResultSet.term + '</span> in <span style="color:#000099">'
+ termResultSet.location + '</span></h2>';
for (var i = 0; i < termResultSet.rows.length; i++) {
html += '<p>' + termResultSet.rows[i].date + ' - ' + '<a href="' + termResultSet.rows[i].href + '">' + termResultSet.rows[i].text + '</a> - ';
html += termResultSet.rows[i].price + ' ' + termResultSet.rows[i].loc + '</p>';
}
return html;
}
/**
* Email the new result sets to the specified user.
* @param {Array} resultSets The array of result sets
*/
function emailResults(resultSets) {
var emailMessage = 'The following craigslist posts are new:\n',
mailOptions = {
from: mailSenderEmail, // sender address
to: notifyEmail, // list of receivers
subject: 'Craigslist Updates',
},
transportOptions = {
service: 'Gmail',
auth: {
user: mailSenderEmail,
pass: mailSenderPass
}
},
smtpTransport = nodemailer.createTransport('SMTP', transportOptions);
// Create email string
for (var i = 0; i < resultSets.length; i++) {
if (resultSets[i].rows.length > 0) {
emailMessage += createResultHtml(resultSets[i]);
}
}
// add html to mail options
mailOptions.html = emailMessage;
// email results. If email fails, do not add results to data file
smtpTransport.sendMail(mailOptions, function(error, response) {
if (error) {
console.log('Message failed: ' + error);
} else {
console.log('Message sent: ' + response.message);
updateDataFile(resultSets);
}
smtpTransport.close(); // shut down the connection pool, no more messages
});
}
function updateDataFile(resultSets) {
var datafile = fs.readFileSync(dataFilePath, 'utf8'),
dataArr = (isEmpty(datafile) ? [] : JSON.parse(datafile));
// add new results to datafile
for (var i = 0; i < resultSets.length; i++) {
var resultSetRows = resultSets[i].rows;
for (var j = 0; j < resultSetRows.length; j++) {
dataArr.push(resultSetRows[j]);
}
var jsonResults = JSON.stringify(dataArr);
fs.writeFileSync(dataFilePath, jsonResults);
}
}
// Searches for each query in data file and compiles results
function processResults() {
console.log('Processing results...');
var datafile = fs.readFileSync(dataFilePath, 'utf8'),
dataArr = (isEmpty(datafile) ? [] : JSON.parse(datafile)),
finalResults = [],
mailIt = false;
// 1. Loop through each queryResult object
// 2. Loop through each interior results array
// 3. If the result is already in the data file, remove it from the results
// 4. If there are > 0 results left, shoot the email out
// Loop through each queryResult
for (var i = 0; i < queryResultSets.length; i++) {
var match = false,
result = {
term: queryResultSets[i].term,
location: queryResultSets[i].location,
rows: []
};
finalResults.push(result);
// Loop through each row in each query result
for (var k = 0; k < queryResultSets[i].rows.length; k++) {
// see if this record is in the data file
for (var j = 0; j < dataArr.length; j++) {
if (queryResultSets[i].rows[k].href === dataArr[j].href) {
match = true;
break;
}
}
// if it hasn't been found in the data file, include it in the results and set mailIt to true
if (!match) {
mailIt = true;
result.rows.push(queryResultSets[i].rows[k]); // no match so add to results
}
}
}
if (mailIt) {
// console.log('Found ' + results.length + 'new results');
emailResults(finalResults);
} else {
console.log('No new results');
}
}
// Check search data file and create if it doesn't exist
// TODO: error handling
if (!isEmpty(process.env.XDG_DATA_HOME)) { // try XDG
dataPath = process.env.XDG_DATA_HOME + '/' + dataDirName;
} else {
if (!isEmpty(process.env.HOME)) {
dataPath = process.env.HOME + '/.local/share/' + dataDirName;
} else {
console.error('No home directory specified. Exiting...');
process.exit(1);
}
}
dataFilePath = dataPath + '/' + dataFileName;
var exists = fs.existsSync(dataPath);
if (!exists) {
console.log('No data folder! Creating one...');
fs.mkdirSync(dataPath, 0700, true);
} else {
console.log('Found data folder.');
}
// Check data file existence
exists = fs.existsSync(dataFilePath);
if (!exists) {
console.log('No data file! Creating one...');
fs.writeFileSync(dataFilePath, '');
} else {
console.log('Found data file.');
}
// Run queries with craigslistscraper
async.each(config.searches, function(search, callback) {
var baseUrl = 'http://' + search.location + '.craigslist.org',
// default to not include nearby
includeNearby = search.nearby || false,
// default to for sale categories
category = search.category || "sss",
results = [];
queryResultSets.push({
term: search.term,
location: search.location,
rows: results
});
craigslistscraper.query(baseUrl, category, search.term, includeNearby, function(result) {
// console.log(result);
results.push(result);
}, callback);
}, function(err) {
if (!isEmpty(err)) {
console.error('Error while querying:' + err);
} else {
console.log('Queries completed successfully.');
processResults();
}
});