text: # -*- coding: utf-8 -*- #
  # Copyright 2015 Google Inc. All Rights Reserved.
  #
  # Licensed under the Apache License, Version 2.0 (the "License");
  # you may not use this file except in compliance with the License.
  # You may obtain a copy of the License at
  #
  #    http://www.apache.org/licenses/LICENSE-2.0
  #
  # Unless required by applicable law or agreed to in writing, software
  # distributed under the License is distributed on an "AS IS" BASIS,
  # WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  # See the License for the specific language governing permissions and
  # limitations under the License.
  """Command for waiting until managed instance group becomes stable."""
  
  from __future__ import absolute_import
  from __future__ import division
  from __future__ import unicode_literals
  
  from googlecloudsdk.api_lib.compute import base_classes
  from googlecloudsdk.api_lib.compute import utils
  from googlecloudsdk.calliope import base
  from googlecloudsdk.command_lib.compute import flags
  from googlecloudsdk.command_lib.compute import scope as compute_scope
  from googlecloudsdk.command_lib.compute.instance_groups import flags as instance_groups_flags
  from googlecloudsdk.command_lib.compute.instance_groups.managed import wait_info
  from googlecloudsdk.command_lib.util import time_util
  from googlecloudsdk.core import log
  
  
  def _AddArgs(parser):
    """Adds args."""
    parser.add_argument('--timeout',
                        type=int,
                        help='Timeout in seconds for waiting '
                        'for group becoming stable.')
    instance_groups_flags.MULTISCOPE_INSTANCE_GROUP_MANAGER_ARG.AddArgument(
        parser)
  
  
  @base.ReleaseTracks(base.ReleaseTrack.GA, base.ReleaseTrack.BETA,
                      base.ReleaseTrack.ALPHA)
  class WaitUntilStable(base.Command):
    """Waits until state of managed instance group is stable."""
  
    _TIME_BETWEEN_POLLS_SEC = 10
  
    @staticmethod
    def Args(parser):
      _AddArgs(parser=parser)
  
    def CreateGroupReference(self, client, resources, args):
      return (instance_groups_flags.MULTISCOPE_INSTANCE_GROUP_MANAGER_ARG.
              ResolveAsResource)(
                  args,
                  resources,
                  default_scope=compute_scope.ScopeEnum.ZONE,
                  scope_lister=flags.GetDefaultScopeLister(client))
  
    def Run(self, args):
      """Issues requests necessary to wait until stable on a MIG."""
      holder = base_classes.ComputeApiHolder(self.ReleaseTrack())
      client = holder.client
      start = time_util.CurrentTimeSec()
      group_ref = self.CreateGroupReference(client, holder.resources, args)
  
      while True:
        responses, errors = self._GetResources(client, group_ref)
        if errors:
          utils.RaiseToolException(errors)
        if wait_info.IsGroupStable(responses[0]):
          break
        log.out.Print(wait_info.CreateWaitText(responses[0]))
        time_util.Sleep(WaitUntilStable._TIME_BETWEEN_POLLS_SEC)
  
        if args.timeout and time_util.CurrentTimeSec() - start > args.timeout:
          raise utils.TimeoutError('Timeout while waiting for group to become '
                                   'stable.')
      log.out.Print('Group is stable')
  
    def GetRequestForGroup(self, client, group_ref):
      if group_ref.Collection() == 'compute.instanceGroupManagers':
        service = client.apitools_client.instanceGroupManagers
        request = service.GetRequestType('Get')(
            instanceGroupManager=group_ref.Name(),
            zone=group_ref.zone,
            project=group_ref.project)
      elif group_ref.Collection() == 'compute.regionInstanceGroupManagers':
        service = client.apitools_client.regionInstanceGroupManagers
        request = service.GetRequestType('Get')(
            instanceGroupManager=group_ref.Name(),
            region=group_ref.region,
            project=group_ref.project)
      else:
        raise ValueError('Unknown reference type {0}'.format(
            group_ref.Collection()))
      return (service, request)
  
    def _GetResources(self, client, group_ref):
      """Retrieves group with pending actions."""
      service, request = self.GetRequestForGroup(client, group_ref)
      errors = []
      results = client.MakeRequests(
          requests=[(service, 'Get', request)],
          errors_to_collect=errors)
  
      return results, errors
  