generate_horizon_gif.js

#! /usr/bin/node
var phantom = require('phantom'),
  fs = require('fs'),
  exec= require('child_process').exec,
  Tumblr = require('tumblrwks'),
  server = require('node-static'),
  url = require('url'),
  config = require('./config.js');

var tumblr = new Tumblr({
      consumerKey: config.key.consumerKey,
      consumerSecret: config.key.consumerSecret,
      accessToken: config.key.accessToken,
      accessSecret: config.key.accessSecret
    }, config.key.blog);


var generating;

var fileServer = new server.Server(__dirname);

var image=0;
var img_size;
var app = require('http').createServer(function (req, res) {
  req.addListener('end', function () {
    fileServer.serve(req, res);
  }).resume();
  if (req.method == 'GET'){
     queryData = url.parse(req.url, true).query;
     img_size = queryData.num;
  }
  if (req.method == 'POST') {
      var body = '';
      req.on('data', function (data) {
          body+=data;
      });
      req.on('end', function () {
          console.log('done: '+image);
          body = body.replace("/^data:image\/png;base64,/", "");
          require("fs").writeFile(__dirname+"/tmp_img/"+image+"_out.png", body, 'base64', function(err) {
             if(err) console.error(err);
             if(img_size==image){
                console.log("finished making images");
                makeGif();
             }
           });
           image++;
      });
      res.writeHead(200, {'Content-Type': 'text/html'});
      res.end('post received');
  }
}).listen(8081);

function run_ph(){
  phantom.create(function(ph){
    ph.createPage(function(page){
      page.set('onConsoleMessage', function (msg) {
        console.log(msg);
      });
      page.open('http://localhost:8081', function (status) {
        console.log("status: "+status);
        console.log('open page');
       });
    });
  });
}


error = fs.createWriteStream( __dirname + '/log/node.error.log', { flags: 'a' });
process.stderr.pipe(error);
run_ph();

function makeGif(){
    var id = new Date().getTime();
    var filename = __dirname+'/gifs/' + id +"_anim.gif";
    var child = exec('bash '+__dirname+'/make_gifs.sh '+filename, function(err, stdout, stderr){
        if(err) console.error(err);
        var removetmp = exec('rm '+__dirname+'/tmp_img/*out.png', function(err, stdout, stderr){
            if(err) console.error(err);
            console.log('gif animation complete');
            postGif(filename);
        });
    });
    console.log(id);
}

function getRandomElement(arr){
  return arr[Math.floor(arr.length*Math.random())]
}

function postGif(filename){
  var photo = fs.readFile(filename, function(err,photo){
    if (err) console.error(err);

    //tags
    var tag_choices= ['lines', 'minimal', 'processing', 'colors',
      'animation', 'horizon', 'geometry', 'calm'];
    var random_tag = getRandomElement(tag_choices);
    console.log("random tag: "+random_tag);
    tumblr.post('/post', {
      type: 'photo',
      data: [photo],
      tags: 'gif, '+ random_tag
    }, function(err, json){
      console.log(json, err);
      if (err) console.error(err);
      console.log("posted on tumblr");
      var removegif = exec('rm '+filename, function(err, stdout, stderr){
        if (err) console.error(err);
        console.log('deleted gif from hd');
      });
      process.exit();
    });
  });
}