asset pipline & minify & gzip and s3 upload for node.js

app.js

require('./lib/compiled');
app.configure('development', function(){
  var Mincer  = require('mincer');
  var environment = new Mincer.Environment();
  environment.appendPath(__dirname + '/app/assets/javascripts');
  app.use('/assets', Mincer.createServer(environment));
  ASSET_JS_PATH = null
});

app.get('/', index);

function index(req, res, next){
  res.render('index', { js_path: ASSET_JS_PATH });
}

mincer_s3upload.js

#!/usr/bin/env node
var fs = require('fs');
var gzip = require('gzip');

var http    = require('http');
var Mincer  = require('mincer');
var exec = require('child_process').exec
var querystring = require("querystring");
var AWS = require('aws-sdk');
AWS.config.update({accessKeyId: ''access_key_id'', 
                   secretAccessKey: ''secret_access_key'', 
                   region: "ap-northeast-1"});
var s3 = new AWS.S3();

var environment = new Mincer.Environment();
environment.appendPath('app/assets/javascripts');

environment.findAsset('application.js').compile(function (err, asset) {
  if(err){
    console.log(err);
    process.exit(1);
  }
  var params = [
    'compilation_level=SIMPLE_OPTIMIZATIONS',
    'output_format=json',
    'output_info=compiled_code',
    'output_info=warnings',
    'output_info=errors',
    'output_info=statistics'
  ]
  params.push(querystring.stringify({js_code: asset.toString()}));
  var param = params.join("&")
  var request_header = {
    'user-agent': 'node.js',
    'content-length': param.length,
    'content-type': 'application/x-www-form-urlencoded'
  }
  var options = {
    host          : "closure-compiler.appspot.com",
    path          : "/compile",
    method        : "POST",
    headers       : request_header
  }
  var msg = ""
  var req = http.request(options,function(res){
    res.setEncoding('utf8');
     res.on('data', function (chunk) {
       msg += chunk
     });
     res.on('end', function (chunk) {
       try{
         var result = JSON.parse(msg);
       }catch(e){
         console.log(msg);
         console.log(e.stack);
         process.exit(1);
       }
       if(result.errors){
         console.log(result.errors);
         console.log("cancelled above error!");
         process.exit(1);
       }
       var jsFile = __dirname + "/lib/compiled.js";
       gzip(result.compiledCode, function(err, compData) {
         if (err) throw err;
         var params = {
                   Bucket: ''bucket_name'', 
                   Key: asset.digestPath + ".jgz", 
                   Body: compData, 
                   ACL:'public-read', 
                   ContentEncoding: "gzip", 
                   ContentType: "application/x-javascript" };
         s3.client.putObject(params,function(err,data) {
          if (err) throw err;
          var url = "https://s3-ap-northeast-1.amazonaws.com/" + 
                   ''bucket_name'' + "/" + asset.digestPath + ".jgz";
          console.log("It\'s post! " + url);
          fs.writeFile(jsFile, "ASSET_JS_PATH='" + url + "';", function (err) {
            if (err) throw err;
            console.log('SUCCESS');
          });
        });
       });
    });
  });
  req.on('error', function(e) {
      console.log('problem with request: ' + e.message);
  });
  req.write(param);
  req.end();
});