github.com/kubewharf/katalyst-core@v0.5.3/pkg/webhook/validating/vpa/overlap_validator.go (about)

     1  /*
     2  Copyright 2022 The Katalyst Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package vpa
    18  
    19  import (
    20  	"fmt"
    21  
    22  	apiequality "k8s.io/apimachinery/pkg/api/equality"
    23  	"k8s.io/apimachinery/pkg/labels"
    24  	"k8s.io/klog/v2"
    25  
    26  	apis "github.com/kubewharf/katalyst-api/pkg/apis/autoscaling/v1alpha1"
    27  	apiListers "github.com/kubewharf/katalyst-api/pkg/client/listers/autoscaling/v1alpha1"
    28  	"github.com/kubewharf/katalyst-core/pkg/util/native"
    29  )
    30  
    31  // WebhookVPAOverlapValidator validate if pod for one vpa overlap with other pods by checking their target reference
    32  type WebhookVPAOverlapValidator struct {
    33  	// vpaLister can list/get VerticalPodAutoscaler from the shared informer's store
    34  	vpaLister apiListers.KatalystVerticalPodAutoscalerLister
    35  }
    36  
    37  func NewWebhookVPAOverlapValidator(vpaLister apiListers.KatalystVerticalPodAutoscalerLister) *WebhookVPAOverlapValidator {
    38  	return &WebhookVPAOverlapValidator{
    39  		vpaLister: vpaLister,
    40  	}
    41  }
    42  
    43  func (wo *WebhookVPAOverlapValidator) ValidateVPA(vpa *apis.KatalystVerticalPodAutoscaler) (valid bool, message string, err error) {
    44  	if vpa == nil {
    45  		err := fmt.Errorf("vpa is nil")
    46  		return false, err.Error(), err
    47  	}
    48  
    49  	// todo: add cache here to avoid list all vpa
    50  	vpas, err := wo.vpaLister.List(labels.Everything())
    51  	if err != nil {
    52  		return false, "failed to list all vpas", err
    53  	}
    54  	klog.V(5).Infof("find %d vpa existing", len(vpas))
    55  
    56  	for _, anotherVPA := range vpas {
    57  		if anotherVPA == nil {
    58  			err := fmt.Errorf("vpa can not be nil")
    59  			return false, err.Error(), err
    60  		}
    61  		if native.CheckObjectEqual(vpa, anotherVPA) {
    62  			klog.Infof("ignore same vpa (%s/%s/%s)", anotherVPA.Namespace, anotherVPA.Name, anotherVPA.UID)
    63  			continue
    64  		}
    65  		if apiequality.Semantic.DeepEqual(vpa.Spec.TargetRef, anotherVPA.Spec.TargetRef) {
    66  			klog.Info("different vpa have same target reference")
    67  			return false, "different vpa have same target reference", nil
    68  		}
    69  	}
    70  
    71  	return true, "", nil
    72  }