example microversion functions

main.go

package main

import (
  "fmt"
  "regexp"
  "strconv"
  "strings"
)

func validMicroversion(mv string) (err error) {
  if mv == "latest" {
    return
  }
  
  mvRe := regexp.MustCompile("^\\d+\\.\\d+$")
  if v := mvRe.MatchString(mv); v {
    return
  }

  err = fmt.Errorf("Invalid microversion specified")
  return
}

func splitMicroversion(mv string) (major, minor int) {
  if err := validMicroversion(mv); err != nil {
    return
  }

  mvParts := strings.Split(mv, ".")
  major, _ = strconv.Atoi(mvParts[0])
  minor, _ = strconv.Atoi(mvParts[1])

  return
}

func compatibleMicroversion(minimumMV, requestedMV string) (err error) {
  if requestedMV == "latest" {
    return
  }

  err = validMicroversion(requestedMV)
  if err != nil {
    return
  }

  minimumMajor, minimumMinor := splitMicroversion(minimumMV)
  requestedMajor, requestedMinor := splitMicroversion(requestedMV)

  if requestedMajor >= minimumMajor && requestedMinor >= minimumMinor {
    return
  }

  err = fmt.Errorf("Incompatible microversion")
  return
}

func main() {
  min := "2.5"

  versions := []string{"2.1", "2.37", "2.4.2", "2.5", "v2.5", "latest"}

  for _, v := range versions {
    err := compatibleMicroversion(min, v)
    fmt.Println(v, err)
  }

}