Node.js Simple Static Web Server

cluster.js

var fs = require('fs'),
    cluster = require('cluster');

var config = JSON.parse(fs.readFileSync(require('path').join(__dirname, 'config.json')));
if (config.cwd && process.cwd() != config.cwd) process.chdir(config.cwd);
var workers = config.workers || require('os').cpus().length;

// 如有指定 log 檔，則將標準輸出和錯誤輸出寫到 log 檔
if (config.log){
  var log_stream = fs.createWriteStream(config.log, {flags: 'a'});
  process.__defineGetter__('stdout', function(){ return log_stream; });
  process.__defineGetter__('stderr', function(){ return log_stream; });
}

if (cluster.isMaster){
  master();
} else {
  require('./worker.js').run(config);
}

function master(){
  // Fork workers.
  for (var i = 0; i < workers; i++) cluster.fork();

  cluster.on('death', function(worker){
    console.log('worker %d died. restart...', worker.pid);
    cluster.fork();
  });
}

config.json

{
  "cwd": "N:\\Path\\To\\NodeStaticServer\\",
  "workers": 2,
  "port": 80,
  "webroot": "N:\\Path\\To\\Web\\",
  "log": "server.log"
}

worker.js

(function (){
  var connect = require('connect');
  // 瀏覽器快取時間 5 分鐘 (maxAge 單位 ms)，資料夾網址尾端自動加 "/"
  var static_options = {maxAge: 1000* 60 * 5, redirect: true};
  // http server app
  var app = connect()
    .use(connect.logger()) // http://www.senchalabs.org/connect/logger.html
    .use(connect.compress()) // http://www.senchalabs.org/connect/compress.html
    .use(connect.staticCache()) // http://www.senchalabs.org/connect/staticCache.html
    .use(function(req, res, next){ // 預設首頁
      if (req.url == '/') req.url += 'index.htm';
      res.setHeader('Server', 'Node.js '+process.version);
      next();
    })
    // http://www.senchalabs.org/connect/static.html
    //.use(connect.static(config.webroot, static_options));
    //.listen(config.port || 80);

  exports.run = function(config){
      app.use(connect.static(config.webroot, static_options))
         .listen(config.port || 80);
    };
}).call(this);