sepro/lib/middleware/iniFile.js

Sepro is a http proxy which discovers where to proxy a request.

var WatchRouter = require('../watcher')
  , inherits = require('util').inherits
  , fs = require('fs')
  , ini = require('ini')


module.exports = IniFile

function IniFile(options) {
  if (!(this instanceof IniFile)) return new IniFile(options)

  if (typeof options === 'string') options = { file: options }

  options = options || {}
  WatchRouter.call(this, options)

  var self = this
    , filename = options.file
    , defaultHost = options.defaultHost || '127.0.0.1'

  self.watch(filename)

  self.on('change', update)
  update()

  function update() {
    fs.readFile(filename, 'utf8', function (err, file) {
      if (err) return self.emit('error', err)

      try {
        file = ini.parse(file)
      } catch (err) {
        self.emit('error', err)
      }

      self.routes = {}
      read(file, '')

      function read(obj, domain) {
        Object.keys(obj).forEach(function (sub) {
          if (typeof obj[sub] === 'object') {
            read(obj[sub], domain + '.' + sub)
            return
          }

          var target = obj[sub].split(':')
            , host
            , port

          if (target.length === 1) {
            host = defaultHost
            port = target[0]
          } else {
            host = target[0]
            port = target[1]
          }

          port = parseInt(port, 10)

          self.routes[sub + domain] = { host: host, port: port }
        })
      }
    })
  }
}

inherits(IniFile, WatchRouter)