update_resources.go

Documentation: k8s.io/kubernetes/test/utils

     1  /*
     2  Copyright 2018 The Kubernetes 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 utils
    18  
    19  import (
    20  	"fmt"
    21  	"time"
    22  
    23  	"k8s.io/apimachinery/pkg/runtime/schema"
    24  	"k8s.io/apimachinery/pkg/util/wait"
    25  	scaleclient "k8s.io/client-go/scale"
    26  	"k8s.io/kubectl/pkg/scale"
    27  )
    28  
    29  const (
    30  	// Parameters for retrying updates/waits with linear backoff.
    31  	// TODO: Try to move this to exponential backoff by modifying scale.Scale().
    32  	updateRetryInterval = 5 * time.Second
    33  	updateRetryTimeout  = 1 * time.Minute
    34  	waitRetryInterval   = 5 * time.Second
    35  	waitRetryTimeout    = 5 * time.Minute
    36  )
    37  
    38  func RetryErrorCondition(condition wait.ConditionFunc) wait.ConditionFunc {
    39  	return func() (bool, error) {
    40  		done, err := condition()
    41  		return done, err
    42  	}
    43  }
    44  
    45  func ScaleResourceWithRetries(scalesGetter scaleclient.ScalesGetter, namespace, name string, size uint, gvr schema.GroupVersionResource) error {
    46  	scaler := scale.NewScaler(scalesGetter)
    47  	preconditions := &scale.ScalePrecondition{
    48  		Size:            -1,
    49  		ResourceVersion: "",
    50  	}
    51  	waitForReplicas := scale.NewRetryParams(waitRetryInterval, waitRetryTimeout)
    52  	cond := RetryErrorCondition(scale.ScaleCondition(scaler, preconditions, namespace, name, size, nil, gvr, false))
    53  	err := wait.PollImmediate(updateRetryInterval, updateRetryTimeout, cond)
    54  	if err == nil {
    55  		err = scale.WaitForScaleHasDesiredReplicas(scalesGetter, gvr.GroupResource(), name, namespace, size, waitForReplicas)
    56  	}
    57  	if err != nil {
    58  		return fmt.Errorf("error while scaling %s to %d replicas: %v", name, size, err)
    59  	}
    60  	return nil
    61  }
    62
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