mirror of
https://github.com/kubernetes-sigs/prometheus-adapter.git
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a293b2bf94
Travis seems to be having issues pulling deps, so we'll have to check in the vendor directory and prevent the makefile from trying to regenerate it normally.
88 lines
2.3 KiB
Go
88 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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