nyc-bookstores/server.js

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2.3 KiB
JavaScript
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2013-05-27 20:45:59 +00:00
// dependencies
var fs = require('fs')
var http = require('http')
var Tabletop = require('tabletop')
var dns = require('dns')
var hasInternet = require('hasinternet')
var cheerio = require('cheerio')
var filed = require('filed')
var router = require('router')
// globals
var sheetData = []
var lastFetch
var KEY = '0Ao5u1U6KYND7dFVkcnJRNUtHWUNKamxoRGg4ZzNiT3c'
// 0Ao5u1U6KYND7dGN5QngweVJUWE16bTRob0d2a3dCbnc has lat/long
// cool
// 0Ao5u1U6KYND7dGJpT3cxTGZrZS1WdWo5RnNpa1dZQmc removed lat/long
// for geocoding testing
// 0AvFUWxii39gXdFhqZzdTeU5DTWtOdENkQ1Y5bHdqT0E pet friends
// ready, set, go!
function reqHandler (req, res) {
var route = router()
route.get('/', serveRoot)
route.get('/js/*', serveStatic)
route.get('/css/*', serveStatic)
route.get('/img/*', serveStatic)
route(req, res)
}
function serveRoot(req, res) {
hasInternet(function answer(err, internet) {
if (internet) return freshData(req, res)
console.log("you are offline, fetching stored data")
localData(req, res, buildPage)
})
}
// if you're offline
function localData(req, res, cb) {
fs.readFile(KEY + '.json', function (err, data) {
if (err) throw err;
var staleData = JSON.parse(data)
cb(req, res, staleData)
})
}
// if online
function freshData(req, res) {
function tabletopCb(data, tabletop){
loadSheet(data, tabletop)
buildPage(req, res, data)
}
var options = {key: KEY, callback: tabletopCb, simpleSheet: true}
if (!sheetData.length || (Date.now() - lastFetch) > 6000000000000000000) {
console.log("you are online with old data, fetching new")
Tabletop.init(options)
}
else {
console.log("you are online with fresh data")
localData(req, res, buildPage)
}
}
function loadSheet(data, tabletop) {
sheetData = data
lastFetch = Date.now()
fs.writeFile(KEY +'.json', JSON.stringify(sheetData))
}
function buildPage(req, res, data) {
var fileLocation = __dirname + '/index.html';
var fileStream = fs.readFile(fileLocation, function (err, contents){
var $ = cheerio.load(contents)
$("head").append("<script type='text/javascript'>var gData = " + JSON.stringify(data) + "</script>");
var completePage = $.html()
return res.end(completePage)
})
}
function serveStatic (req, res) {
filed(__dirname + req.url).pipe(res);
}
var server = http.createServer(reqHandler)
var port = process.env.PORT || 3300
server.listen(port)
console.log('Listening on port 3300')