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server.js
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server.js
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#!/bin/env node
// OpenShift sample Node application
var express = require('express');
var fs = require('fs');
var requestify = require("requestify");
var express = require('express');
var monk = require('monk');
var config = require('./config/config');
var db = monk(config.connection_string);
var checkInModel = require('./model/checkIn');
var indegoController = require('./controller/IndegoController');
/**
* Define the sample application.
*/
var PingingApp = function() {
// Scope.
var self = this;
self.previousPingData = ({});
self.setupVariables = function() {
// Set the environment variables we need.
self.ipaddress = process.env.OPENSHIFT_NODEJS_IP;
self.port = process.env.OPENSHIFT_NODEJS_PORT || 8082;
if (typeof self.ipaddress === "undefined") {
// Log errors on OpenShift but continue w/ 127.0.0.1 - this
// allows us to run/test the app locally.
console.warn('No OPENSHIFT_NODEJS_IP var, using 127.0.0.1');
self.ipaddress = "127.0.0.1";
};
};
/**
* Populate the cache.
*/
self.populateCache = function() {
if (typeof self.zcache === "undefined") {
self.zcache = { 'index.html': '' };
}
// Local cache for static content.
self.zcache['index.html'] = fs.readFileSync('./index.html');
};
/**
* Retrieve entry (content) from cache.
* @param {string} key Key identifying content to retrieve from cache.
*/
self.cache_get = function(key) { return self.zcache[key]; };
/**
* terminator === the termination handler
* Terminate server on receipt of the specified signal.
* @param {string} sig Signal to terminate on.
*/
self.terminator = function(sig){
if (typeof sig === "string") {
console.log('%s: Received %s - terminating sample app ...',
Date(Date.now()), sig);
process.exit(1);
}
console.log('%s: Node server stopped.', Date(Date.now()) );
};
/**
* Setup termination handlers (for exit and a list of signals).
*/
self.setupTerminationHandlers = function(){
// Process on exit and signals.
process.on('exit', function() { self.terminator(); });
// Removed 'SIGPIPE' from the list - bugz 852598.
['SIGHUP', 'SIGINT', 'SIGQUIT', 'SIGILL', 'SIGTRAP', 'SIGABRT',
'SIGBUS', 'SIGFPE', 'SIGUSR1', 'SIGSEGV', 'SIGUSR2', 'SIGTERM'
].forEach(function(element, index, array) {
process.on(element, function() { self.terminator(element); });
});
};
/* ================================================================ */
/* App server functions (main app logic here). */
/* ================================================================ */
/**
* Create the routing table entries + handlers for the application.
*/
self.createRoutes = function() {
self.routes = { };
self.routes['/asciimo'] = function(req, res) {
var link = "http://i.imgur.com/kmbjB.png";
res.send("<html><body><img src='" + link + "'></body></html>");
};
self.routes['/'] = function(req, res) {
res.setHeader('Content-Type', 'text/html');
res.send(self.cache_get('index.html') );
};
};
/**
* Initialize the server (express) and create the routes and register
* the handlers.
*/
self.initializeServer = function() {
self.createRoutes();
self.app = express();
// Add handlers for the app (from the routes).
for (var r in self.routes) {
self.app.get(r, self.routes[r]);
}
};
/**
* Initializes the sample application.
*/
self.initialize = function() {
self.setupVariables();
self.populateCache();
self.setupTerminationHandlers();
// Create the express server and routes.
self.initializeServer();
};
/**
* Start the server (starts up the sample application).
*/
self.start = function() {
// Start the app on the specific interface (and port).
self.app.listen(self.port, self.ipaddress, function() {
console.log('%s: Node server started on %s:%d ...',
Date(Date.now() ), self.ipaddress, self.port);
});
self.startPingingIndego();
};
self.insertData = function(data) {
var collection = db.get('features');
collection.insert(data, function(err, doc){
if (err) {
console.error("Error occured during inserting the data : " + err);
}
});
}
self.addTimeStamp = function (data) {
data.forEach(function (elem) {
elem.properties['timeStamp'] = new Date();
});
return data;
}
self.isDataChanged = function (data) {
var hasChanged = false;
if (typeof previousPingData === 'undefined') {
console.info("previousPingData is not recorded");
return true;
}
previousPingData.forEach(function (elem) {
if (elem.properties['kioskId'] === data.properties['kioskId']
&& elem.properties['bikesAvailable'] !== data.properties['bikesAvailable']){
console.log(elem.properties['timeStamp'] + " number of Available bikes changed for " + elem.properties['kioskId'] + ": ");
console.log("Was Available" + elem.properties['bikesAvailable']);
console.log("Now Available" + data.properties['bikesAvailable']);
hasChanged = true;
}
})
return hasChanged;
}
self.startPingingIndego = function () {
var ic;
if (db !== NaN) {
console.log("Connected to database");
}
console.info(config.indegoRESTUrl);
setInterval(function () {
requestify.get(config.indegoRESTUrl)
.then(function(response) {
// Get the response body
data = response.getBody();
var modifiedData = self.addTimeStamp(data.features);
console.info("Checking for previous changes ...");
modifiedData.forEach(function (elemData) {
ic = new checkInModel(elemData);
if (self.isDataChanged(elemData)) {
self.insertData(ic.getData());
console.info("Data recorded");
} else {
//SKip
}
});
previousPingData = modifiedData;
}
);
}, config.intervalTime);
}
};
var indegoPing = new PingingApp();
indegoPing.initialize();
indegoPing.start();