Added HorizontalPodAutoscaler object to experimental API.

Added HorizontalPodAutoscaler object to experimental API. Related to #12087.

pkg/expapi/validation/validation.go

@@ -0,0 +1,67 @@
+/*
+Copyright 2015 The Kubernetes Authors 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.
+*/
+
+package validation
+
+import (
+	"k8s.io/kubernetes/pkg/api"
+	apivalidation "k8s.io/kubernetes/pkg/api/validation"
+	"k8s.io/kubernetes/pkg/expapi"
+	errs "k8s.io/kubernetes/pkg/util/fielderrors"
+)
+
+// ValidateHorizontalPodAutoscaler can be used to check whether the given autoscaler name is valid.
+// Prefix indicates this name will be used as part of generation, in which case trailing dashes are allowed.
+func ValidateHorizontalPodAutoscalerName(name string, prefix bool) (bool, string) {
+	// TODO: finally move it to pkg/api/validation and use nameIsDNSSubdomain function
+	return apivalidation.ValidateReplicationControllerName(name, prefix)
+}
+
+func validateHorizontalPodAutoscalerSpec(autoscaler expapi.HorizontalPodAutoscalerSpec) errs.ValidationErrorList {
+	allErrs := errs.ValidationErrorList{}
+	if autoscaler.MinCount < 0 {
+		allErrs = append(allErrs, errs.NewFieldInvalid("minCount", autoscaler.MinCount, `must be non-negative`))
+	}
+	if autoscaler.MaxCount < autoscaler.MinCount {
+		allErrs = append(allErrs, errs.NewFieldInvalid("maxCount", autoscaler.MaxCount, `must be bigger or equal to minCount`))
+	}
+	if autoscaler.ScaleRef == nil {
+		allErrs = append(allErrs, errs.NewFieldRequired("scaleRef"))
+	}
+	resource := autoscaler.Target.Resource.String()
+	if resource != string(api.ResourceMemory) && resource != string(api.ResourceCPU) {
+		allErrs = append(allErrs, errs.NewFieldInvalid("target.resource", resource, "resource not supported by autoscaler"))
+	}
+	quantity := autoscaler.Target.Quantity.Value()
+	if quantity < 0 {
+		allErrs = append(allErrs, errs.NewFieldInvalid("target.quantity", quantity, "must be non-negative"))
+	}
+	return allErrs
+}
+
+func ValidateHorizontalPodAutoscaler(autoscaler *expapi.HorizontalPodAutoscaler) errs.ValidationErrorList {
+	allErrs := errs.ValidationErrorList{}
+	allErrs = append(allErrs, apivalidation.ValidateObjectMeta(&autoscaler.ObjectMeta, true, ValidateHorizontalPodAutoscalerName).Prefix("metadata")...)
+	allErrs = append(allErrs, validateHorizontalPodAutoscalerSpec(autoscaler.Spec)...)
+	return allErrs
+}
+
+func ValidateHorizontalPodAutoscalerUpdate(newAutoscler, oldAutoscaler *expapi.HorizontalPodAutoscaler) errs.ValidationErrorList {
+	allErrs := errs.ValidationErrorList{}
+	allErrs = append(allErrs, apivalidation.ValidateObjectMetaUpdate(&newAutoscler.ObjectMeta, &oldAutoscaler.ObjectMeta).Prefix("metadata")...)
+	allErrs = append(allErrs, validateHorizontalPodAutoscalerSpec(newAutoscler.Spec)...)
+	return allErrs
+}