How to use the dsub.providers.google_v2_operations function in dsub

elif field == 'status-message':
      msg, action = self._operation_status_message()
      if msg.startswith('Execution failed:'):
        # msg may look something like
        # "Execution failed: action 2: pulling image..."
        # Emit the actual message ("pulling image...")
        msg = msg.split(': ', 2)[-1]
      value = msg
    elif field == 'status-detail':
      msg, action = self._operation_status_message()
      if action:
        value = action.get('name') + ':\n' + msg
      else:
        value = msg
    elif field == 'last-update':
      last_update = google_v2_operations.get_last_update(self._op)
      if last_update:
        value = google_base.parse_rfc3339_utc_string(last_update)
    elif field == 'provider':
      return _PROVIDER_NAME
    elif field == 'provider-attributes':
      value = {}

      # The VM instance name and zone can be found in the WorkerAssignedEvent.
      # For a given operation, this may have occurred multiple times, so be
      # sure to grab the most recent.
      assigned_events = google_v2_operations.get_worker_assigned_events(
          self._op)
      if assigned_events:
        details = assigned_events[0].get('details', {})
        value['instance-name'] = details.get('instance')
        value['zone'] = details.get('zone')

value.update({item.name: item.value for item in items})
    elif field == 'mounts':
      if self._job_descriptor:
        items = providers_util.get_job_and_task_param(
            self._job_descriptor.job_params,
            self._job_descriptor.task_descriptors[0].task_params, field)
        value = {item.name: item.value for item in items}
    elif field == 'create-time':
      ds = google_v2_operations.get_create_time(self._op)
      value = google_base.parse_rfc3339_utc_string(ds)
    elif field == 'start-time':
      ds = google_v2_operations.get_start_time(self._op)
      if ds:
        value = google_base.parse_rfc3339_utc_string(ds)
    elif field == 'end-time':
      ds = google_v2_operations.get_end_time(self._op)
      if ds:
        value = google_base.parse_rfc3339_utc_string(ds)
    elif field == 'status':
      value = self._operation_status()
    elif field == 'status-message':
      msg, action = self._operation_status_message()
      if msg.startswith('Execution failed:'):
        # msg may look something like
        # "Execution failed: action 2: pulling image..."
        # Emit the actual message ("pulling image...")
        msg = msg.split(': ', 2)[-1]
      value = msg
    elif field == 'status-detail':
      msg, action = self._operation_status_message()
      if action:
        value = action.get('name') + ':\n' + msg

def _get_create_time_filters(self, create_time_min, create_time_max):
    filters = []
    for create_time, comparator in [(create_time_min, '>='), (create_time_max,
                                                              '<=')]:
      if not create_time:
        continue

      filters.append(
          google_v2_operations.create_time_filter(create_time, comparator))
    return filters

def _operation_status_message(self):
    """Returns the most relevant status string and failed action.

    This string is meant for display only.

    Returns:
      A printable status string and name of failed action (if any).
    """
    msg = None
    action = None
    if not google_v2_operations.is_done(self._op):
      last_event = google_v2_operations.get_last_event(self._op)
      if last_event:
        msg = last_event['description']
        action_id = last_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      else:
        msg = 'Pending'
    else:
      failed_events = google_v2_operations.get_failed_events(self._op)
      if failed_events:
        failed_event = failed_events[-1]
        msg = failed_event.get('details', {}).get('stderr')
        action_id = failed_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      if not msg:

msg = last_event['description']
        action_id = last_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      else:
        msg = 'Pending'
    else:
      failed_events = google_v2_operations.get_failed_events(self._op)
      if failed_events:
        failed_event = failed_events[-1]
        msg = failed_event.get('details', {}).get('stderr')
        action_id = failed_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      if not msg:
        error = google_v2_operations.get_error(self._op)
        if error:
          msg = error['message']
        else:
          msg = 'Success'

    return msg, action

return _PROVIDER_NAME
    elif field == 'provider-attributes':
      value = {}

      # The VM instance name and zone can be found in the WorkerAssignedEvent.
      # For a given operation, this may have occurred multiple times, so be
      # sure to grab the most recent.
      assigned_events = google_v2_operations.get_worker_assigned_events(
          self._op)
      if assigned_events:
        details = assigned_events[0].get('details', {})
        value['instance-name'] = details.get('instance')
        value['zone'] = details.get('zone')

      # The rest of the information comes from the request itself.
      resources = google_v2_operations.get_resources(self._op)
      if 'regions' in resources:
        value['regions'] = resources['regions']
      if 'zones' in resources:
        value['zones'] = resources['zones']
      if 'virtualMachine' in resources:
        vm = resources['virtualMachine']
        value['machine-type'] = vm.get('machineType')
        value['preemptible'] = vm.get('preemptible')

        value['boot-disk-size'] = vm.get('bootDiskSizeGb')
        value['network'] = vm.get('network', {}).get('name')
        value['subnetwork'] = vm.get('network', {}).get('subnetwork')
        value['use_private_address'] = vm.get('network',
                                              {}).get('usePrivateAddress')
        value['cpu_platform'] = vm.get('cpuPlatform')
        value['accelerators'] = vm.get('accelerators')

def _operation_status(self):
    """Returns the status of this operation.

    Raises:
      ValueError: if the operation status cannot be determined.

    Returns:
      A printable status string (RUNNING, SUCCESS, CANCELED or FAILURE).
    """
    if not google_v2_operations.is_done(self._op):
      return 'RUNNING'
    if google_v2_operations.is_success(self._op):
      return 'SUCCESS'
    if google_v2_operations.is_canceled(self._op):
      return 'CANCELED'
    if google_v2_operations.is_failed(self._op):
      return 'FAILURE'

    raise ValueError('Status for operation {} could not be determined'.format(
        self._op['name']))

def _operation_status(self):
    """Returns the status of this operation.

    Raises:
      ValueError: if the operation status cannot be determined.

    Returns:
      A printable status string (RUNNING, SUCCESS, CANCELED or FAILURE).
    """
    if not google_v2_operations.is_done(self._op):
      return 'RUNNING'
    if google_v2_operations.is_success(self._op):
      return 'SUCCESS'
    if google_v2_operations.is_canceled(self._op):
      return 'CANCELED'
    if google_v2_operations.is_failed(self._op):
      return 'FAILURE'

    raise ValueError('Status for operation {} could not be determined'.format(
        self._op['name']))

Returns:
      A printable status string and name of failed action (if any).
    """
    msg = None
    action = None
    if not google_v2_operations.is_done(self._op):
      last_event = google_v2_operations.get_last_event(self._op)
      if last_event:
        msg = last_event['description']
        action_id = last_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      else:
        msg = 'Pending'
    else:
      failed_events = google_v2_operations.get_failed_events(self._op)
      if failed_events:
        failed_event = failed_events[-1]
        msg = failed_event.get('details', {}).get('stderr')
        action_id = failed_event.get('details', {}).get('actionId')
        if action_id:
          action = google_v2_operations.get_action_by_id(self._op, action_id)
      if not msg:
        error = google_v2_operations.get_error(self._op)
        if error:
          msg = error['message']
        else:
          msg = 'Success'

    return msg, action

def _get_status_filters(self, statuses):
    if not statuses or statuses == {'*'}:
      return None

    return [google_v2_operations.STATUS_FILTER_MAP[s] for s in statuses]