webogram-i2p/app/js/lib/mtproto_wrapper.js

/*!
 * Webogram v0.5.4 - messaging web application for MTProto
 * https://github.com/zhukov/webogram
 * Copyright (C) 2014 Igor Zhukov <igor.beatle@gmail.com>
 * https://github.com/zhukov/webogram/blob/master/LICENSE
 */

angular.module('izhukov.mtproto.wrapper', ['izhukov.utils', 'izhukov.mtproto'])

  .factory('MtpApiManager', function (Storage, MtpAuthorizer, MtpNetworkerFactory, MtpSingleInstanceService, AppRuntimeManager, ErrorService, qSync, $rootScope, $q, TelegramMeWebService) {
    var cachedNetworkers = {}
    var cachedUploadNetworkers = {}
    var cachedExportPromise = {}
    var baseDcID = false

    var telegramMeNotified

    MtpSingleInstanceService.start()

    Storage.get('dc').then(function (dcID) {
      if (dcID) {
        baseDcID = dcID
      }
    })

    function telegramMeNotify (newValue) {
      if (telegramMeNotified !== newValue) {
        telegramMeNotified = newValue
        TelegramMeWebService.setAuthorized(telegramMeNotified)
      }
    }

    function mtpSetUserAuth (dcID, userAuth) {
      var fullUserAuth = angular.extend({dcID: dcID}, userAuth)
      Storage.set({
        dc: dcID,
        user_auth: fullUserAuth
      })
      telegramMeNotify(true)
      $rootScope.$broadcast('user_auth', fullUserAuth)

      baseDcID = dcID
    }

    function mtpLogOut () {
      var storageKeys = []
      for (var dcID = 1; dcID <= 5; dcID++) {
        storageKeys.push('dc' + dcID + '_auth_key')
      }
      return Storage.get(storageKeys).then(function (storageResult) {
        var logoutPromises = []
        for (var i = 0; i < storageResult.length; i++) {
          if (storageResult[i]) {
            logoutPromises.push(mtpInvokeApi('auth.logOut', {}, {dcID: i + 1}))
          }
        }
        return $q.all(logoutPromises).then(function () {
          Storage.remove('dc', 'user_auth')
          baseDcID = false
          telegramMeNotify(false)
          return mtpClearStorage()
        }, function (error) {
          storageKeys.push('dc', 'user_auth')
          Storage.remove(storageKeys)
          baseDcID = false
          error.handled = true
          telegramMeNotify(false)
          return mtpClearStorage()
        })
      })
    }

    function mtpClearStorage () {
      var saveKeys = []
      for (var dcID = 1; dcID <= 5; dcID++) {
        saveKeys.push('dc' + dcID + '_auth_key')
        saveKeys.push('t_dc' + dcID + '_auth_key')
      }
      Storage.noPrefix()
      Storage.get(saveKeys).then(function (values) {
        Storage.clear().then(function () {
          var restoreObj = {}
          angular.forEach(saveKeys, function (key, i) {
            var value = values[i]
            if (value !== false && value !== undefined) {
              restoreObj[key] = value
            }
          })
          Storage.noPrefix()
          return Storage.set(restoreObj)
        })
      })
    }

    function mtpGetNetworker (dcID, options) {
      options = options || {}

      var cache = (options.fileUpload || options.fileDownload)
        ? cachedUploadNetworkers
        : cachedNetworkers
      if (!dcID) {
        throw new Exception('get Networker without dcID')
      }

      if (cache[dcID] !== undefined) {
        return qSync.when(cache[dcID])
      }

      var akk = 'dc' + dcID + '_auth_key'
      var ssk = 'dc' + dcID + '_server_salt'

      return Storage.get(akk, ssk).then(function (result) {
        if (cache[dcID] !== undefined) {
          return cache[dcID]
        }

        var authKeyHex = result[0]
        var serverSaltHex = result[1]
        // console.log('ass', dcID, authKeyHex, serverSaltHex)
        if (authKeyHex && authKeyHex.length == 512) {
          if (!serverSaltHex || serverSaltHex.length != 16) {
            serverSaltHex = 'AAAAAAAAAAAAAAAA'
          }
          var authKey = bytesFromHex(authKeyHex)
          var serverSalt = bytesFromHex(serverSaltHex)

          return cache[dcID] = MtpNetworkerFactory.getNetworker(dcID, authKey, serverSalt, options)
        }

        if (!options.createNetworker) {
          return $q.reject({type: 'AUTH_KEY_EMPTY', code: 401})
        }

        return MtpAuthorizer.auth(dcID).then(function (auth) {
          var storeObj = {}
          storeObj[akk] = bytesToHex(auth.authKey)
          storeObj[ssk] = bytesToHex(auth.serverSalt)
          Storage.set(storeObj)

          return cache[dcID] = MtpNetworkerFactory.getNetworker(dcID, auth.authKey, auth.serverSalt, options)
        }, function (error) {
          console.log('Get networker error', error, error.stack)
          return $q.reject(error)
        })
      })
    }

    function mtpInvokeApi (method, params, options) {
      options = options || {}

      var deferred = $q.defer()
      var rejectPromise = function (error) {
          if (!error) {
            error = {type: 'ERROR_EMPTY'}
          } else if (!angular.isObject(error)) {
            error = {message: error}
          }
          deferred.reject(error)

          if (!options.noErrorBox) {
            error.input = method
            error.stack = stack || (error.originalError && error.originalError.stack) || error.stack || (new Error()).stack
            setTimeout(function () {
              if (!error.handled) {
                if (error.code == 401) {
                  mtpLogOut()['finally'](function () {
                    if (location.protocol == 'http:' &&
                      !Config.Modes.http &&
                      Config.App.domains.indexOf(location.hostname) != -1) {
                      location.href = location.href.replace(/^http:/, 'https:')
                    } else {
                      location.hash = '/login'
                      AppRuntimeManager.reload()
                    }
                  })
                } else {
                  ErrorService.show({error: error})
                }
                error.handled = true
              }
            }, 100)
          }
        },
        dcID,
        networkerPromise

      var cachedNetworker
      var stack = (new Error()).stack || 'empty stack'
      var performRequest = function (networker) {
        return (cachedNetworker = networker).wrapApiCall(method, params, options).then(
          function (result) {
            deferred.resolve(result)
          },
          function (error) {
            console.error(dT(), 'Error', error.code, error.type, baseDcID, dcID)
            if (error.code == 401 && baseDcID == dcID) {
              Storage.remove('dc', 'user_auth')
              telegramMeNotify(false)
              rejectPromise(error)
            }
            else if (error.code == 401 && baseDcID && dcID != baseDcID) {
              if (cachedExportPromise[dcID] === undefined) {
                var exportDeferred = $q.defer()

                mtpInvokeApi('auth.exportAuthorization', {dc_id: dcID}, {noErrorBox: true}).then(function (exportedAuth) {
                  mtpInvokeApi('auth.importAuthorization', {
                    id: exportedAuth.id,
                    bytes: exportedAuth.bytes
                  }, {dcID: dcID, noErrorBox: true}).then(function () {
                    exportDeferred.resolve()
                  }, function (e) {
                    exportDeferred.reject(e)
                  })
                }, function (e) {
                  exportDeferred.reject(e)
                })

                cachedExportPromise[dcID] = exportDeferred.promise
              }

              cachedExportPromise[dcID].then(function () {
                (cachedNetworker = networker).wrapApiCall(method, params, options).then(function (result) {
                  deferred.resolve(result)
                }, rejectPromise)
              }, rejectPromise)
            }
            else if (error.code == 303) {
              var newDcID = error.type.match(/^(PHONE_MIGRATE_|NETWORK_MIGRATE_|USER_MIGRATE_)(\d+)/)[2]
              if (newDcID != dcID) {
                if (options.dcID) {
                  options.dcID = newDcID
                } else {
                  Storage.set({dc: baseDcID = newDcID})
                }

                mtpGetNetworker(newDcID, options).then(function (networker) {
                  networker.wrapApiCall(method, params, options).then(function (result) {
                    deferred.resolve(result)
                  }, rejectPromise)
                }, rejectPromise)
              }
            }
            else if (!options.rawError && error.code == 420) {
              var waitTime = error.type.match(/^FLOOD_WAIT_(\d+)/)[1] || 10
              if (waitTime > (options.timeout || 60)) {
                return rejectPromise(error)
              }
              setTimeout(function () {
                performRequest(cachedNetworker)
              }, waitTime * 1000)
            }
            else if (!options.rawError && (error.code == 500 || error.type == 'MSG_WAIT_FAILED')) {
              var now = tsNow()
              if (options.stopTime) {
                if (now >= options.stopTime) {
                  return rejectPromise(error)
                }
              } else {
                options.stopTime = now + (options.timeout !== undefined ? options.timeout : 10) * 1000
              }
              options.waitTime = options.waitTime ? Math.min(60, options.waitTime * 1.5) : 1
              setTimeout(function () {
                performRequest(cachedNetworker)
              }, options.waitTime * 1000)
            }else {
              rejectPromise(error)
            }
          })
      }

      if (dcID = (options.dcID || baseDcID)) {
        mtpGetNetworker(dcID, options).then(performRequest, rejectPromise)
      } else {
        Storage.get('dc').then(function (baseDcID) {
          mtpGetNetworker(dcID = baseDcID || 2, options).then(performRequest, rejectPromise)
        })
      }

      return deferred.promise
    }

    function mtpGetUserID () {
      return Storage.get('user_auth').then(function (auth) {
        telegramMeNotify(auth && auth.id > 0 || false)
        return auth.id || 0
      })
    }

    function getBaseDcID () {
      return baseDcID || false
    }

    return {
      getBaseDcID: getBaseDcID,
      getUserID: mtpGetUserID,
      invokeApi: mtpInvokeApi,
      getNetworker: mtpGetNetworker,
      setUserAuth: mtpSetUserAuth,
      logOut: mtpLogOut
    }
  })

  .factory('MtpApiFileManager', function (MtpApiManager, $q, qSync, FileManager, IdbFileStorage, TmpfsFileStorage, MemoryFileStorage, WebpManager) {
    var cachedFs = false
    var cachedFsPromise = false
    var cachedSavePromises = {}
    var cachedDownloadPromises = {}
    var cachedDownloads = {}

    var downloadPulls = {}
    var downloadActives = {}

    function downloadRequest (dcID, cb, activeDelta) {
      if (downloadPulls[dcID] === undefined) {
        downloadPulls[dcID] = []
        downloadActives[dcID] = 0
      }
      var downloadPull = downloadPulls[dcID]
      var deferred = $q.defer()
      downloadPull.push({cb: cb, deferred: deferred, activeDelta: activeDelta})
      setZeroTimeout(function () {
        downloadCheck(dcID)
      })

      return deferred.promise
    }

    var index = 0

    function downloadCheck (dcID) {
      var downloadPull = downloadPulls[dcID]
      var downloadLimit = dcID == 'upload' ? 11 : 5

      if (downloadActives[dcID] >= downloadLimit || !downloadPull || !downloadPull.length) {
        return false
      }

      var data = downloadPull.shift()
      var activeDelta = data.activeDelta || 1

      downloadActives[dcID] += activeDelta

      var a = index++
      data.cb()
        .then(function (result) {
          downloadActives[dcID] -= activeDelta
          downloadCheck(dcID)

          data.deferred.resolve(result)
        }, function (error) {
          downloadActives[dcID] -= activeDelta
          downloadCheck(dcID)

          data.deferred.reject(error)
        })
    }

    function getFileName (location) {
      switch (location._) {
        case 'inputDocumentFileLocation':
          var fileName = (location.file_name || '').split('.', 2)
          var ext = fileName[1] || ''
          if (location.sticker && !WebpManager.isWebpSupported()) {
            ext += '.png'
          }
          return fileName[0] + '_' + location.id + '.' + ext

        default:
          if (!location.volume_id) {
            console.trace('Empty location', location)
          }
          var ext = 'jpg'
          if (location.sticker) {
            ext = WebpManager.isWebpSupported() ? 'webp' : 'png'
          }
          return location.volume_id + '_' + location.local_id + '_' + location.secret + '.' + ext
      }
    }

    function getTempFileName (file) {
      var size = file.size || -1
      var random = nextRandomInt(0xFFFFFFFF)
      return '_temp' + random + '_' + size
    }

    function getCachedFile (location) {
      if (!location) {
        return false
      }
      var fileName = getFileName(location)

      return cachedDownloads[fileName] || false
    }

    function getFileStorage () {
      if (!Config.Modes.memory_only) {
        if (TmpfsFileStorage.isAvailable()) {
          return TmpfsFileStorage
        }
        if (IdbFileStorage.isAvailable()) {
          return IdbFileStorage
        }
      }
      return MemoryFileStorage
    }

    function saveSmallFile (location, bytes) {
      var fileName = getFileName(location)
      var mimeType = 'image/jpeg'

      if (!cachedSavePromises[fileName]) {
        cachedSavePromises[fileName] = getFileStorage().saveFile(fileName, bytes).then(function (blob) {
          return cachedDownloads[fileName] = blob
        }, function (error) {
          delete cachedSavePromises[fileName]
        })
      }
      return cachedSavePromises[fileName]
    }

    function downloadSmallFile (location) {
      if (!FileManager.isAvailable()) {
        return $q.reject({type: 'BROWSER_BLOB_NOT_SUPPORTED'})
      }
      var fileName = getFileName(location)
      var mimeType = location.sticker ? 'image/webp' : 'image/jpeg'
      var cachedPromise = cachedSavePromises[fileName] || cachedDownloadPromises[fileName]

      if (cachedPromise) {
        return cachedPromise
      }

      var fileStorage = getFileStorage()

      return cachedDownloadPromises[fileName] = fileStorage.getFile(fileName).then(function (blob) {
        return cachedDownloads[fileName] = blob
      }, function () {
        var downloadPromise = downloadRequest(location.dc_id, function () {
          var inputLocation = location
          if (!inputLocation._ || inputLocation._ == 'fileLocation') {
            inputLocation = angular.extend({}, location, {_: 'inputFileLocation'})
          }
          // console.log('next small promise')
          return MtpApiManager.invokeApi('upload.getFile', {
            location: inputLocation,
            offset: 0,
            limit: 1024 * 1024
          }, {
            dcID: location.dc_id,
            fileDownload: true,
            createNetworker: true,
            noErrorBox: true
          })
        })

        var processDownloaded = function (bytes) {
          if (!location.sticker || WebpManager.isWebpSupported()) {
            return qSync.when(bytes)
          }
          return WebpManager.getPngBlobFromWebp(bytes)
        }

        return fileStorage.getFileWriter(fileName, mimeType).then(function (fileWriter) {
          return downloadPromise.then(function (result) {
            return processDownloaded(result.bytes).then(function (proccessedResult) {
              return FileManager.write(fileWriter, proccessedResult).then(function () {
                return cachedDownloads[fileName] = fileWriter.finalize()
              })
            })
          })
        })
      })
    }

    function getDownloadedFile (location, size) {
      var fileStorage = getFileStorage()
      var fileName = getFileName(location)

      return fileStorage.getFile(fileName, size)
    }

    function downloadFile (dcID, location, size, options) {
      if (!FileManager.isAvailable()) {
        return $q.reject({type: 'BROWSER_BLOB_NOT_SUPPORTED'})
      }

      options = options || {}

      var processSticker = false
      if (location.sticker && !WebpManager.isWebpSupported()) {
        if (options.toFileEntry || size > 524288) {
          delete location.sticker
        } else {
          processSticker = true
          options.mime = 'image/png'
        }
      }

      // console.log(dT(), 'Dload file', dcID, location, size)
      var fileName = getFileName(location)
      var toFileEntry = options.toFileEntry || null
      var cachedPromise = cachedSavePromises[fileName] || cachedDownloadPromises[fileName]

      var fileStorage = getFileStorage()

      // console.log(dT(), 'fs', fileStorage.name, fileName, cachedPromise)

      if (cachedPromise) {
        if (toFileEntry) {
          return cachedPromise.then(function (blob) {
            return FileManager.copy(blob, toFileEntry)
          })
        }
        return cachedPromise
      }

      var deferred = $q.defer()
      var canceled = false
      var resolved = false
      var mimeType = options.mime || 'image/jpeg',
        cacheFileWriter
      var errorHandler = function (error) {
        deferred.reject(error)
        errorHandler = angular.noop
        if (cacheFileWriter &&
          (!error || error.type != 'DOWNLOAD_CANCELED')) {
          cacheFileWriter.truncate(0)
        }
      }

      fileStorage.getFile(fileName, size).then(function (blob) {
        if (toFileEntry) {
          FileManager.copy(blob, toFileEntry).then(function () {
            deferred.resolve()
          }, errorHandler)
        } else {
          deferred.resolve(cachedDownloads[fileName] = blob)
        }
      }, function () {
        var fileWriterPromise = toFileEntry ? FileManager.getFileWriter(toFileEntry) : fileStorage.getFileWriter(fileName, mimeType)

        var processDownloaded = function (bytes) {
          if (!processSticker) {
            return qSync.when(bytes)
          }
          return WebpManager.getPngBlobFromWebp(bytes)
        }

        fileWriterPromise.then(function (fileWriter) {
          cacheFileWriter = fileWriter
          var limit = 524288,
            offset
          var startOffset = 0
          var writeFilePromise = $q.when(),
            writeFileDeferred
          if (fileWriter.length) {
            startOffset = fileWriter.length
            if (startOffset >= size) {
              if (toFileEntry) {
                deferred.resolve()
              } else {
                deferred.resolve(cachedDownloads[fileName] = fileWriter.finalize())
              }
              return
            }
            fileWriter.seek(startOffset)
            deferred.notify({done: startOffset, total: size})
          }
          for (offset = startOffset; offset < size; offset += limit) {
            writeFileDeferred = $q.defer()
            ;(function (isFinal, offset, writeFileDeferred, writeFilePromise) {
              return downloadRequest(dcID, function () {
                if (canceled) {
                  return $q.when()
                }
                return MtpApiManager.invokeApi('upload.getFile', {
                  location: location,
                  offset: offset,
                  limit: limit
                }, {
                  dcID: dcID,
                  fileDownload: true,
                  singleInRequest: window.safari !== undefined,
                  createNetworker: true
                })
              }, 2).then(function (result) {
                writeFilePromise.then(function () {
                  if (canceled) {
                    return $q.when()
                  }
                  return processDownloaded(result.bytes).then(function (processedResult) {
                    return FileManager.write(fileWriter, processedResult).then(function () {
                      writeFileDeferred.resolve()
                    }, errorHandler).then(function () {
                      if (isFinal) {
                        resolved = true
                        if (toFileEntry) {
                          deferred.resolve()
                        } else {
                          deferred.resolve(cachedDownloads[fileName] = fileWriter.finalize())
                        }
                      } else {
                        deferred.notify({done: offset + limit, total: size})
                      }
                    })
                  })
                })
              })
            })(offset + limit >= size, offset, writeFileDeferred, writeFilePromise)
            writeFilePromise = writeFileDeferred.promise
          }
        })
      })

      deferred.promise.cancel = function () {
        if (!canceled && !resolved) {
          canceled = true
          delete cachedDownloadPromises[fileName]
          errorHandler({type: 'DOWNLOAD_CANCELED'})
        }
      }

      if (!toFileEntry) {
        cachedDownloadPromises[fileName] = deferred.promise
      }

      return deferred.promise
    }

    function uploadFile (file) {
      var fileSize = file.size,
        isBigFile = fileSize >= 10485760,
        canceled = false,
        resolved = false,
        doneParts = 0,
        partSize = 262144, // 256 Kb
        activeDelta = 2

      if (fileSize > 67108864) {
        partSize = 524288
        activeDelta = 4
      }
      else if (fileSize < 102400) {
        partSize = 32768
        activeDelta = 1
      }
      var totalParts = Math.ceil(fileSize / partSize)

      if (totalParts > 3000) {
        return $q.reject({type: 'FILE_TOO_BIG'})
      }

      var fileID = [nextRandomInt(0xFFFFFFFF), nextRandomInt(0xFFFFFFFF)]
      var deferred = $q.defer()
      var errorHandler = function (error) {
          // console.error('Up Error', error)
          deferred.reject(error)
          canceled = true
          errorHandler = angular.noop
        },
        part = 0,
        offset,
        resultInputFile = {
          _: isBigFile ? 'inputFileBig' : 'inputFile',
          id: fileID,
          parts: totalParts,
          name: file.name,
          md5_checksum: ''
      }

      for (offset = 0; offset < fileSize; offset += partSize) {
        (function (offset, part) {
          downloadRequest('upload', function () {
            var uploadDeferred = $q.defer()

            var reader = new FileReader()
            var blob = file.slice(offset, offset + partSize)

            reader.onloadend = function (e) {
              if (canceled) {
                uploadDeferred.reject()
                return
              }
              if (e.target.readyState != FileReader.DONE) {
                return
              }
              MtpApiManager.invokeApi(isBigFile ? 'upload.saveBigFilePart' : 'upload.saveFilePart', {
                file_id: fileID,
                file_part: part,
                file_total_parts: totalParts,
                bytes: e.target.result
              }, {
                startMaxLength: partSize + 256,
                fileUpload: true,
                singleInRequest: true
              }).then(function (result) {
                doneParts++
                uploadDeferred.resolve()
                if (doneParts >= totalParts) {
                  deferred.resolve(resultInputFile)
                  resolved = true
                } else {
                  console.log(dT(), 'Progress', doneParts * partSize / fileSize)
                  deferred.notify({done: doneParts * partSize, total: fileSize})
                }
              }, errorHandler)
            }

            reader.readAsArrayBuffer(blob)

            return uploadDeferred.promise
          }, activeDelta)
        })(offset, part++)
      }

      deferred.promise.cancel = function () {
        console.log('cancel upload', canceled, resolved)
        if (!canceled && !resolved) {
          canceled = true
          errorHandler({type: 'UPLOAD_CANCELED'})
        }
      }

      return deferred.promise
    }

    return {
      getCachedFile: getCachedFile,
      getDownloadedFile: getDownloadedFile,
      downloadFile: downloadFile,
      downloadSmallFile: downloadSmallFile,
      saveSmallFile: saveSmallFile,
      uploadFile: uploadFile
    }
  })

  .service('MtpSingleInstanceService', function (_, $rootScope, $compile, $timeout, $interval, $modalStack, Storage, AppRuntimeManager, IdleManager, ErrorService, MtpNetworkerFactory) {
    var instanceID = nextRandomInt(0xFFFFFFFF)
    var started = false
    var masterInstance = false
    var deactivatePromise = false
    var deactivated = false

    function start () {
      if (!started && !Config.Navigator.mobile && !Config.Modes.packed) {
        started = true

        IdleManager.start()

        $rootScope.$watch('idle.isIDLE', checkInstance)
        $interval(checkInstance, 5000)
        checkInstance()

        try {
          $($window).on('beforeunload', clearInstance)
        } catch (e) {}
      }
    }

    function clearInstance () {
      Storage.remove(masterInstance ? 'xt_instance' : 'xt_idle_instance')
    }

    function deactivateInstance () {
      if (masterInstance || deactivated) {
        return false
      }
      console.log(dT(), 'deactivate')
      deactivatePromise = false
      deactivated = true
      clearInstance()
      $modalStack.dismissAll()

      document.title = _('inactive_tab_title_raw')

      var inactivePageCompiled = $compile('<ng-include src="\'partials/desktop/inactive.html\'"></ng-include>')

      var scope = $rootScope.$new(true)
      scope.close = function () {
        AppRuntimeManager.close()
      }
      scope.reload = function () {
        AppRuntimeManager.reload()
      }
      inactivePageCompiled(scope, function (clonedElement) {
        $('.page_wrap').hide()
        $(clonedElement).appendTo($('body'))
      })
      $rootScope.idle.deactivated = true
    }

    function checkInstance () {
      if (deactivated) {
        return false
      }
      var time = tsNow()
      var idle = $rootScope.idle && $rootScope.idle.isIDLE
      var newInstance = {id: instanceID, idle: idle, time: time}

      Storage.get('xt_instance', 'xt_idle_instance').then(function (result) {
        var curInstance = result[0]
        var idleInstance = result[1]

        // console.log(dT(), 'check instance', newInstance, curInstance, idleInstance)
        if (!idle ||
          !curInstance ||
          curInstance.id == instanceID ||
          curInstance.time < time - 60000) {
          if (idleInstance &&
            idleInstance.id == instanceID) {
            Storage.remove('xt_idle_instance')
          }
          Storage.set({xt_instance: newInstance})
          if (!masterInstance) {
            MtpNetworkerFactory.startAll()
            console.warn(dT(), 'now master instance', newInstance)
          }
          masterInstance = true
          if (deactivatePromise) {
            $timeout.cancel(deactivatePromise)
            deactivatePromise = false
          }
        } else {
          Storage.set({xt_idle_instance: newInstance})
          if (masterInstance) {
            MtpNetworkerFactory.stopAll()
            console.warn(dT(), 'now idle instance', newInstance)
            if (!deactivatePromise) {
              deactivatePromise = $timeout(deactivateInstance, 30000)
            }
          }
          masterInstance = false
        }
      })
    }

    return {
      start: start
    }
  })