forked from rook/rook
55 lines
1.6 KiB
Go
55 lines
1.6 KiB
Go
/*
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Package kit for Kubernetes operators
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Copyright 2016 The Rook Authors. All rights reserved.
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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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Some of the code below came from https://github.com/coreos/etcd-operator
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which also has the apache 2.0 license.
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*/
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package kit
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import (
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"fmt"
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"time"
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)
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// ConditionFunc returns true if a retry condition has been satisfied.
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// If the condition returns false, the retry will try again.
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type ConditionFunc func() (bool, error)
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// Retry retries f every interval until after maxRetries.
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// The interval won't be affected by how long f takes.
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// For example, if interval is 3s, f takes 1s, another f will be called 2s later.
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// However, if f takes longer than interval, it will be delayed.
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func Retry(context KubeContext, f ConditionFunc) error {
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interval := time.Duration(context.RetryDelay) * time.Second
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tick := time.NewTicker(interval)
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defer tick.Stop()
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for i := 0; i < context.MaxRetries; i++ {
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ok, err := f()
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if err != nil {
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return fmt.Errorf("failed on retry %d. %+v", i, err)
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}
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if ok {
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return nil
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}
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if i < context.MaxRetries-1 {
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<-tick.C
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}
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}
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return fmt.Errorf("failed after max retries %d", context.MaxRetries)
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}
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