func GetDeploymentOldReplicaSets()

in src/app/backend/resource/deployment/oldreplicasets.go [31:93]
53 lines of code
9 McCabe index (conditional complexity)

func GetDeploymentOldReplicaSets(client client.Interface, dsQuery *dataselect.DataSelectQuery,
	namespace string, deploymentName string) (*replicaset.ReplicaSetList, error) {

	oldReplicaSetList := &replicaset.ReplicaSetList{
		ReplicaSets: make([]replicaset.ReplicaSet, 0),
		ListMeta:    api.ListMeta{TotalItems: 0},
	}

	deployment, err := client.AppsV1().Deployments(namespace).Get(context.TODO(), deploymentName, metaV1.GetOptions{})
	if err != nil {
		return oldReplicaSetList, err
	}

	selector, err := metaV1.LabelSelectorAsSelector(deployment.Spec.Selector)
	if err != nil {
		return oldReplicaSetList, err
	}
	options := metaV1.ListOptions{LabelSelector: selector.String()}

	channels := &common.ResourceChannels{
		ReplicaSetList: common.GetReplicaSetListChannelWithOptions(client,
			common.NewSameNamespaceQuery(namespace), options, 1),
		PodList: common.GetPodListChannelWithOptions(client,
			common.NewSameNamespaceQuery(namespace), options, 1),
		EventList: common.GetEventListChannelWithOptions(client,
			common.NewSameNamespaceQuery(namespace), options, 1),
	}

	rawRs := <-channels.ReplicaSetList.List
	if err := <-channels.ReplicaSetList.Error; err != nil {
		return oldReplicaSetList, err
	}

	rawPods := <-channels.PodList.List
	if err := <-channels.PodList.Error; err != nil {
		return oldReplicaSetList, err
	}

	rawEvents := <-channels.EventList.List
	err = <-channels.EventList.Error
	nonCriticalErrors, criticalError := errors.HandleError(err)
	if criticalError != nil {
		return oldReplicaSetList, criticalError
	}

	rawRepSets := make([]*apps.ReplicaSet, 0)
	for i := range rawRs.Items {
		rawRepSets = append(rawRepSets, &rawRs.Items[i])
	}
	oldRs, _, err := FindOldReplicaSets(deployment, rawRepSets)
	if err != nil {
		return oldReplicaSetList, err
	}

	oldReplicaSets := make([]apps.ReplicaSet, len(oldRs))
	for i, replicaSet := range oldRs {
		oldReplicaSets[i] = *replicaSet
	}

	oldReplicaSetList = replicaset.ToReplicaSetList(oldReplicaSets, rawPods.Items, rawEvents.Items,
		nonCriticalErrors, dsQuery, nil)
	return oldReplicaSetList, nil
}