walnut.js/lib/local-server.js

'use strict';

// Note the odd use of callbacks (instead of promises) here
// It's to avoid loading bluebird yet (see sni-server.js for explanation)
module.exports.create = function (lex, certPaths, port, info, serverCallback) {
  function initServer(err, server) {
    var app;
    var promiseApp;

    if (err) {
      serverCallback(err);
      return;
    }

    server.on('error', serverCallback);
    server.listen(port, '0.0.0.0', function () {
      // is it even theoritically possible for
      // a request to come in before this callback has fired?
      // I'm assuming this event must fire before any request event
      promiseApp = serverCallback(null, server);
    });
    /*
    server.listen(port, '::::', function () {
      // is it even theoritically possible for
      // a request to come in before this callback has fired?
      // I'm assuming this event must fire before any request event
      promiseApp = serverCallback(null, server);
    });
    */

    // Get up and listening as absolutely quickly as possible
    function onRequest(req, res) {
      // this is a hot piece of code, so we cache the result
      if (app) {
        app(req, res);
        return;
      }

      promiseApp.then(function (_app) {
        console.log('[Server]', req.method, req.host || req.headers['x-forwarded-host'] || req.headers.host, req.url);
        app = _app;
        app(req, res);
      });
    }

    if (lex) {
      server.on('request', lex.middleware(onRequest));
    } else {
      server.on('request', onRequest);
    }
  }

  if (certPaths) {
    require('./sni-server').create(lex, certPaths, initServer);
  } else {
    initServer(null, require('http').createServer());
  }
};