57 lines
1.6 KiB
Go
57 lines
1.6 KiB
Go
/*
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Copyright 2015 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 cacher
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import (
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"math"
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"strings"
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"time"
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)
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// hasPathPrefix returns true if the string matches pathPrefix exactly, or if is prefixed with pathPrefix at a path segment boundary
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func hasPathPrefix(s, pathPrefix string) bool {
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// Short circuit if s doesn't contain the prefix at all
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if !strings.HasPrefix(s, pathPrefix) {
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return false
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}
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pathPrefixLength := len(pathPrefix)
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if len(s) == pathPrefixLength {
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// Exact match
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return true
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}
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if strings.HasSuffix(pathPrefix, "/") {
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// pathPrefix already ensured a path segment boundary
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return true
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}
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if s[pathPrefixLength:pathPrefixLength+1] == "/" {
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// The next character in s is a path segment boundary
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// Check this instead of normalizing pathPrefix to avoid allocating on every call
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return true
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}
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return false
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}
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// calculateRetryAfterForUnreadyCache calculates the retry duration based on the cache downtime.
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func calculateRetryAfterForUnreadyCache(downtime time.Duration) int {
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factor := 0.06
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result := math.Exp(factor * downtime.Seconds())
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result = math.Min(30, math.Max(1, result))
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return int(result)
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}
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