mirror of
https://github.com/prometheus/prometheus.git
synced 2024-11-18 03:24:05 -08:00
89 lines
2.3 KiB
Go
89 lines
2.3 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 version
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import (
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"regexp"
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"strconv"
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"strings"
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)
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type versionType int
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const (
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// Bigger the version type number, higher priority it is
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versionTypeAlpha versionType = iota
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versionTypeBeta
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versionTypeGA
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)
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var kubeVersionRegex = regexp.MustCompile("^v([\\d]+)(?:(alpha|beta)([\\d]+))?$")
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func parseKubeVersion(v string) (majorVersion int, vType versionType, minorVersion int, ok bool) {
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var err error
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submatches := kubeVersionRegex.FindStringSubmatch(v)
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if len(submatches) != 4 {
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return 0, 0, 0, false
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}
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switch submatches[2] {
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case "alpha":
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vType = versionTypeAlpha
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case "beta":
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vType = versionTypeBeta
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case "":
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vType = versionTypeGA
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default:
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return 0, 0, 0, false
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}
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if majorVersion, err = strconv.Atoi(submatches[1]); err != nil {
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return 0, 0, 0, false
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}
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if vType != versionTypeGA {
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if minorVersion, err = strconv.Atoi(submatches[3]); err != nil {
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return 0, 0, 0, false
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}
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}
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return majorVersion, vType, minorVersion, true
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}
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// CompareKubeAwareVersionStrings compares two kube-like version strings.
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// Kube-like version strings are starting with a v, followed by a major version, optional "alpha" or "beta" strings
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// followed by a minor version (e.g. v1, v2beta1). Versions will be sorted based on GA/alpha/beta first and then major
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// and minor versions. e.g. v2, v1, v1beta2, v1beta1, v1alpha1.
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func CompareKubeAwareVersionStrings(v1, v2 string) int {
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if v1 == v2 {
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return 0
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}
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v1major, v1type, v1minor, ok1 := parseKubeVersion(v1)
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v2major, v2type, v2minor, ok2 := parseKubeVersion(v2)
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switch {
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case !ok1 && !ok2:
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return strings.Compare(v2, v1)
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case !ok1 && ok2:
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return -1
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case ok1 && !ok2:
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return 1
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}
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if v1type != v2type {
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return int(v1type) - int(v2type)
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}
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if v1major != v2major {
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return v1major - v2major
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}
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return v1minor - v2minor
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}
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