docker-remote-api/index.js

var host = require('docker-host')
var xtend = require('xtend')
var once = require('once')
var querystring = require('querystring')
var concat = require('concat-stream')

var noop = function() {}

var onjson = function(req, res, cb) {
  res.pipe(concat({encoding:'buffer'}, function(buf) {
    try {
      buf = JSON.parse(buf)
    } catch (err) {
      return cb(err)
    }
    cb(null, buf)
  }))
}

var onbuffer = function(req, res, cb) {
  res.pipe(concat({encoding:'buffer'}, function(buf) {
    cb(null, buf)
  }))
}

var onstream = function(req, res, cb) {
  req.on('close', function() {
    res.emit('close')
  })
  req.on('error', function(err) {
    res.emit('error', err)
  })
  cb(null, res)
}

var onerror = function(req, res, cb) {
  res.pipe(concat({encoding:'buffer'}, function(buf) {
    var err = new Error(buf.toString().trim() || 'Bad status code: '+res.statusCode)
    err.statusCode = res.statusCode
    cb(err)
  }))
}

var destroyer = function(req) {
  return function() {
    req.destroy()
  }
}

var API = function(remote, defaults) {
  if (!(this instanceof API)) return new API(remote, defaults)

  if (typeof remote === 'object' && !defaults) {
    defaults = remote
    remote = null
  }

  this.defaults = xtend(host(remote), defaults)
  this.http = (this.defaults.protocol === 'https:' ? require('https') : require('http')).request
}

API.prototype.get = function(path, opts, cb) {
  return this.request('GET', path, opts, cb)
}

API.prototype.put = function(path, opts, cb) {
  return this.request('PUT', path, opts, cb)
}

API.prototype.post = function(path, opts, cb) {
  return this.request('POST', path, opts, cb)
}

API.prototype.head = function(path, opts, cb) {
  return this.request('HEAD', path, opts, cb)
}

API.prototype.del = API.prototype.delete = function(path, opts, cb) {
  return this.request('DELETE', path, opts, cb)
}

API.prototype.request = function(method, path, opts, cb) {
  if (typeof opts === 'function') {
    cb = opts
    opts = null
  }

  cb = once(cb || noop)
  opts = xtend(this.defaults, opts)

  if (opts.qs) path += '?'+querystring.stringify(opts.qs)
  if (opts.version) path = '/'+opts.version+path

  opts.method = method
  opts.path = path

  var headers = opts.headers
  if (headers) {
    Object.keys(headers).forEach(function(name) {
      if (typeof headers[name] === 'object' && headers[name]) headers[name] = new Buffer(JSON.stringify(headers[name])+'\n').toString('base64')
    })
  }

  var req = this.http(opts)

  if (opts.timeout) req.setTimeout(opts.timeout, destroyer(req))
  if (opts.json && opts.json !== true) opts.body = JSON.stringify(opts.json)

  req.on('response', function(res) {
    if (res.statusCode > 299) onerror(req, res, cb)
    else if (opts.buffer) onbuffer(req, res, cb)
    else if (opts.json) onjson(req, res, cb)
    else onstream(req, res, cb)
  })

  req.on('error', cb)
  req.on('close', function() {
    cb(new Error('Premature close'))
  })

  if (method !== 'POST' && method !== 'PUT') req.end()
  else if (opts.body) req.end(opts.body)

  return req
}

module.exports = API