i have this code from an node.js/express application i am trying to develop:
var blade = require('blade')
,express = require('express')
,http = require('http')
,https = require('https')
,fs = require('fs')
,nowjs = require('now')
,City = require('geoip').City,json;
var city = new City('data/GeoLiteCity.dat' );
var GOOGLE_API_KEY = process.env.GOOGLE_API_KEY;
var TABLE_ID = "1epTUiUlv5NQK5x4sgdy1K47ACDTpHH60hbng1qw";
//var TABLE_ID ="1obpi0bmSDILX1cIQcVRNi1lUkm2K5xBFztmRFiM"
var GOOGLE_PATH =
"/fusiontables/v1/query?sql=SELECT%20*%20FROM%20"+TABLE_ID+"&key="+GOOGLE_API_KEY;
var GOOGLE_DRIVE_PATH = "/drive/v2/files/"+TABLE_ID+"?key="+GOOGLE_API_KEY;
var options = {
hostname: 'www.googleapis.com'
,port: 443
,method: 'GET'
};
var lastModifiedDate = '';
TZMNetwork(TABLE_ID);
function TZMNetwork(fileId) {
if (fs.existsSync("data/chapters.json")) {
var x = '';
options["path"] = GOOGLE_DRIVE_PATH;
var req = https.request(options, function(res) {
res.on('data', function(d) {
x += d.toString();
//console.log(d.toString());
}).on('end', next);
});
req.end();
req.on('error', function(e) {
console.error(e);
});
function next() {
var l = JSON.parse(x);
var modifiedDate = l.modifiedDate.toString();
if (!lastModifiedDate === modifiedDate) {
console.log('chapters.json is out of date');
getChapters();
}
//console.log(l.modifiedDate);
//options['modifiedDate'] = l.modifiedDate.toString();
lastModifiedDate += l.modifiedDate.toString();
}
console.log('OK');
} else {
getChapters();
}
}
function getChapters() {
options["path"] = GOOGLE_PATH;
var file = fs.createWriteStream("data/chapters.json");
var req = https.request(options, function(res) {
res.on('data', function(data) {
file.write(data);
}).on('end', function() {
file.end();
console.log("chapters.json created");
});
});
req.end();
req.on('error', function(e) {
console.error(e);
});
}
function dumpError(err) {
if (typeof err === 'object') {
if (err.message) {
console.log('\nMessage: ' + err.message)
}
if (err.stack) {
console.log('\nStacktrace:')
console.log('====================')
console.log(err.stack);
}
} else {
console.log('dumpError :: argument is not an object');
}
}
var app = express();
app.use(blade.middleware(__dirname + '/views') ); //for client-side
templates
app.use(express.favicon(__dirname + '/public/images/favicon.ico'));
app.use(express.static(__dirname + '/public') ); //maybe we have some
static files
//app.use(blade.middleware(__dirname + '/views') ); //for client-side
templates
app.use(express.static(__dirname + "/public") ); //maybe we have some
static files
app.set('views', __dirname + '/views'); //tells Express where our views are
stored
try {
app.set('translation', require(__dirname +
'/public/locales/dev/translation.json'));
app.set('chapters', require(__dirname + '/data/chapters.json'));
} catch(err) {
dumpError(err);
console.log('there is no /data/chapters.json');
app.set('chapters', []);
}
app.set('view engine', 'blade'); //Yes! Blade works with Express out of the
box!
app.get('/', function(req, res, next) {
TZMNetwork(TABLE_ID);
console.log(lastModifiedDate);
res.render('index');
});
app.get( '/map', function( req, res, next ) {
var ip = ( req.connection.remoteAddress !== "127.0.0.1" )?
req.connection.remoteAddress: "72.196.192.58";
city.lookup( ip, function( err, loc ) {
if ( err ) {
loc = {};
}
res.render( 'map', { loc: loc } );
});
});
app.locals.pretty=true;
app.listen(29080);
console.log('Server running at http://127.0.0.1:29080/');
basically when the applications starts, i have this try/catch:
try {
app.set('translation', require(__dirname +
'/public/locales/dev/translation.json'));
app.set('chapters', require(__dirname + '/data/chapters.json'));
} catch(err) {
dumpError(err);
console.log('there is no /data/chapters.json nor translation.json');
app.set('translation', []);
app.set('chapters', []);
}
which checks if these files exist, if not it sets and empty array!
what will be the correct way to call the TZMNetwork()function and then
reset the app.set('chapters', require(__dirname + '/data/chapters.json')); or
do the 'try'/catch again?
also, the TZMNetwork()function checks to see if the lastModifiedDate has
changed and if it has then it creates a new chapters.json file; this check
is also done when the user accesses the root of the application.
is there a better way to do this?
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