ss-localconfigs/lib/localconfigs.js

load and apply per app configuration from client/code/<apps>/socketstream.json

/**
 * Fetch configurations locally
 */

var _ = require('underscore');
var Error = require('errno-codes');
var fs = require('fs');
var path = require('path');

var catchExcept = function(fn, error) {
  try {
    return fn();  
  } catch(err) {
    if(err.errno == error.errno) {
      return false;
    } else {
      throw err;
    }
  }
}

var isFileSync = function(filename) {
  return catchExcept( function() {
    return fs.statSync(filename).isFile();  
  }, Error.ENOENT);
}

var isDirectorySync = function(filename) {
  return catchExcept(function() {
    return fs.statSync(filename).isDirectory();
  }, Error.ENOENT)
}

var debug = function(h) {
  console.log(h);
  return h;
}

var postfixFilename = function(file, dir) {
  return path.join(dir, file);
}

var fillNameRoute = function(app) {
  var dirname = path.basename(path.dirname(app[0]));
  if(!app[1].name) {
    app[1].name = dirname;
  }
  if(!app[1].route) {
    app[1].route = '/' + dirname;
  }
  return app[1];
}

var getConfigurations = function(directory, filename) {
  var configFiles = _.chain(fs.readdirSync(directory))
    .map(path.join.bind(null, directory))
    .filter(isDirectorySync)
    .compact()
    .map(postfixFilename.bind(null, filename))
    .filter(isFileSync)
    .compact()
    .value();

  var configs = _.chain(configFiles)
    .map(function(name) {
      // map also passing a second parameter that we get rid of
      // otherwise readFileSync will interpret as the encoding
      // parameter...
      return fs.readFileSync(name);
    })
    .map(JSON.parse)
    .value();

  return _.map(_.zip(configFiles, configs), fillNameRoute);
}

function defineApp(ss, config) {
  console.log('adding ' + config.name + ' at ' + config.route);
  ss.client.define(config.name, config);
  ss.http.route(config.route, function(req, res) {
    res.serveClient(config.name);
  });
}

function applyConfigs(ss, dir, filename) {
  _.chain(getConfigurations(dir, filename))
    .map(defineApp.bind(null, ss));
}

exports.applyConfigs = applyConfigs;