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timeutil.go
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timeutil.go
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// Copyright 2016 Google, Inc.
//
// 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 timeutil
import "time"
const (
factor = 1.3
)
// Backoff returns a value in [0, maxDelay] that increases exponentially with
// retries, starting from baseDelay.
func Backoff(baseDelay, maxDelay time.Duration, retries int) time.Duration {
backoff, max := float64(baseDelay), float64(maxDelay)
for backoff < max && retries > 0 {
backoff *= factor
retries--
}
if backoff > max {
backoff = max
}
return time.Duration(backoff)
}