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65 lines
2.0 KiB
Go
65 lines
2.0 KiB
Go
/*
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Copyright 2018 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package utils
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import (
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"fmt"
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"time"
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"k8s.io/apimachinery/pkg/runtime/schema"
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"k8s.io/apimachinery/pkg/util/wait"
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"k8s.io/client-go/scale"
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"k8s.io/kubernetes/pkg/kubectl"
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)
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const (
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// Parameters for retrying updates/waits with linear backoff.
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// TODO: Try to move this to exponential backoff by modifying kubectl.Scale().
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updateRetryInterval = 5 * time.Second
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updateRetryTimeout = 1 * time.Minute
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waitRetryInterval = 5 * time.Second
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waitRetryTimeout = 5 * time.Minute
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)
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func RetryErrorCondition(condition wait.ConditionFunc) wait.ConditionFunc {
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return func() (bool, error) {
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done, err := condition()
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if err != nil && IsRetryableAPIError(err) {
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return false, nil
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}
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return done, err
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}
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}
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func ScaleResourceWithRetries(scalesGetter scale.ScalesGetter, namespace, name string, size uint, gr schema.GroupResource) error {
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scaler := kubectl.NewScaler(scalesGetter)
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preconditions := &kubectl.ScalePrecondition{
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Size: -1,
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ResourceVersion: "",
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}
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waitForReplicas := kubectl.NewRetryParams(waitRetryInterval, waitRetryTimeout)
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cond := RetryErrorCondition(kubectl.ScaleCondition(scaler, preconditions, namespace, name, size, nil, gr))
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err := wait.PollImmediate(updateRetryInterval, updateRetryTimeout, cond)
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if err == nil {
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err = kubectl.WaitForScaleHasDesiredReplicas(scalesGetter, gr, name, namespace, size, waitForReplicas)
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}
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if err != nil {
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return fmt.Errorf("Error while scaling %s to %d replicas: %v", name, size, err)
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}
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return nil
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}
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