strategy.go

package deployconfig

import (
	"fmt"
	"reflect"

	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
	"k8s.io/apimachinery/pkg/fields"
	"k8s.io/apimachinery/pkg/labels"
	"k8s.io/apimachinery/pkg/runtime"
	"k8s.io/apimachinery/pkg/util/validation/field"
	apirequest "k8s.io/apiserver/pkg/endpoints/request"
	kstorage "k8s.io/apiserver/pkg/storage"
	"k8s.io/apiserver/pkg/storage/names"
	kapi "k8s.io/kubernetes/pkg/api"

	deployapi "github.com/openshift/origin/pkg/deploy/apis/apps"
	"github.com/openshift/origin/pkg/deploy/apis/apps/validation"
)

// strategy implements behavior for DeploymentConfig objects
type strategy struct {
	runtime.ObjectTyper
	names.NameGenerator
}

// Strategy is the default logic that applies when creating and updating DeploymentConfig objects.
var Strategy = strategy{kapi.Scheme, names.SimpleNameGenerator}

// NamespaceScoped is true for DeploymentConfig objects.
func (strategy) NamespaceScoped() bool {
	return true
}

// AllowCreateOnUpdate is false for DeploymentConfig objects.
func (strategy) AllowCreateOnUpdate() bool {
	return false
}

func (strategy) AllowUnconditionalUpdate() bool {
	return false
}

func (s strategy) Export(ctx apirequest.Context, obj runtime.Object, exact bool) error {
	s.PrepareForCreate(ctx, obj)
	return nil
}

// PrepareForCreate clears fields that are not allowed to be set by end users on creation.
func (strategy) PrepareForCreate(ctx apirequest.Context, obj runtime.Object) {
	dc := obj.(*deployapi.DeploymentConfig)
	dc.Generation = 1
	dc.Status = deployapi.DeploymentConfigStatus{}

	for i := range dc.Spec.Triggers {
		if params := dc.Spec.Triggers[i].ImageChangeParams; params != nil {
			params.LastTriggeredImage = ""
		}
	}
}

// PrepareForUpdate clears fields that are not allowed to be set by end users on update.
func (strategy) PrepareForUpdate(ctx apirequest.Context, obj, old runtime.Object) {
	newDc := obj.(*deployapi.DeploymentConfig)
	oldDc := old.(*deployapi.DeploymentConfig)

	newVersion := newDc.Status.LatestVersion
	oldVersion := oldDc.Status.LatestVersion

	// Persist status
	newDc.Status = oldDc.Status

	// oc deploy --latest from old clients
	// TODO: Remove once we drop support for older clients
	if newVersion == oldVersion+1 {
		newDc.Status.LatestVersion = newVersion
	}

	// TODO: Disallow lastTriggeredImage updates from this update path.

	// Any changes to the spec or labels, increment the generation number, any changes
	// to the status should reflect the generation number of the corresponding object
	// (should be handled by the controller).
	if !reflect.DeepEqual(oldDc.Spec, newDc.Spec) || newDc.Status.LatestVersion != oldDc.Status.LatestVersion {
		newDc.Generation = oldDc.Generation + 1
	}
}

// Canonicalize normalizes the object after validation.
func (strategy) Canonicalize(obj runtime.Object) {
}

// Validate validates a new policy.
func (strategy) Validate(ctx apirequest.Context, obj runtime.Object) field.ErrorList {
	return validation.ValidateDeploymentConfig(obj.(*deployapi.DeploymentConfig))
}

// ValidateUpdate is the default update validation for an end user.
func (strategy) ValidateUpdate(ctx apirequest.Context, obj, old runtime.Object) field.ErrorList {
	return validation.ValidateDeploymentConfigUpdate(obj.(*deployapi.DeploymentConfig), old.(*deployapi.DeploymentConfig))
}

// CheckGracefulDelete allows a deployment config to be gracefully deleted.
func (strategy) CheckGracefulDelete(obj runtime.Object, options *metav1.DeleteOptions) bool {
	return false
}

// statusStrategy implements behavior for DeploymentConfig status updates.
type statusStrategy struct {
	strategy
}

var StatusStrategy = statusStrategy{Strategy}

// PrepareForUpdate clears fields that are not allowed to be set by end users on update of status.
func (statusStrategy) PrepareForUpdate(ctx apirequest.Context, obj, old runtime.Object) {
	newDc := obj.(*deployapi.DeploymentConfig)
	oldDc := old.(*deployapi.DeploymentConfig)
	newDc.Spec = oldDc.Spec
	newDc.Labels = oldDc.Labels
}

// ValidateUpdate is the default update validation for an end user updating status.
func (statusStrategy) ValidateUpdate(ctx apirequest.Context, obj, old runtime.Object) field.ErrorList {
	return validation.ValidateDeploymentConfigStatusUpdate(obj.(*deployapi.DeploymentConfig), old.(*deployapi.DeploymentConfig))
}

// GetAttrs returns labels and fields of a given object for filtering purposes
func GetAttrs(obj runtime.Object) (labels.Set, fields.Set, error) {
	deploymentConfig, ok := obj.(*deployapi.DeploymentConfig)
	if !ok {
		return nil, nil, fmt.Errorf("not a DeploymentConfig")
	}
	return labels.Set(deploymentConfig.ObjectMeta.Labels), deployapi.DeploymentConfigToSelectableFields(deploymentConfig), nil
}

// Matcher returns a generic matcher for a given label and field selector.
func Matcher(label labels.Selector, field fields.Selector) kstorage.SelectionPredicate {
	return kstorage.SelectionPredicate{
		Label:    label,
		Field:    field,
		GetAttrs: GetAttrs,
	}
}