/
versions.go
147 lines (122 loc) · 3.51 KB
/
versions.go
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package versions
import (
"fmt"
"sort"
"strings"
"github.com/blang/semver"
"github.com/concourse/bosh-io-stemcell-resource/boshio"
)
type StemcellVersions []map[string]string
type Filter struct {
initialVersion string
stemcells []boshio.Stemcell
versionFamily string
}
func NewFilter(initialVersion string, stemcells []boshio.Stemcell, versionFamily string) Filter {
return Filter{
initialVersion: initialVersion,
stemcells: stemcells,
versionFamily: versionFamily,
}
}
func (f Filter) Versions() (StemcellVersions, error) {
if len(f.stemcells) == 0 {
return StemcellVersions{}, nil
}
stemcellVersions := f.mapStemcellsToVersions(f.stemcells)
if len(f.versionFamily) > 0 && f.versionFamily != "latest" {
var err error
stemcellVersions, err = f.filterStemcellsByVersionFamily(stemcellVersions)
if err != nil {
return StemcellVersions{}, err
}
}
if len(stemcellVersions) == 0 {
return StemcellVersions{}, nil
}
sort.Sort(stemcellVersions)
if f.initialVersion == "" {
return stemcellVersions[len(stemcellVersions)-1:], nil
}
return f.selectVersionsGreaterThanInitial(stemcellVersions)
}
func (f Filter) mapStemcellsToVersions(stemcells []boshio.Stemcell) StemcellVersions {
versions := StemcellVersions{}
for _, s := range stemcells {
versions = append(versions, map[string]string{"version": s.Version})
}
return versions
}
func (f Filter) filterStemcellsByVersionFamily(stemcells StemcellVersions) (StemcellVersions, error) {
familyVersion := f.versionFamily
if strings.Contains(f.versionFamily, ".latest") {
familyVersion = f.versionFamily[0 : len(f.versionFamily)-len(".latest")]
}
parsedVersion, err := semver.ParseTolerant(familyVersion)
if err != nil {
return StemcellVersions{}, err
}
parsedVersionCeiling := parsedVersion
numberOfSignificantDigits := strings.Count(familyVersion, ".") + 1
switch numberOfSignificantDigits {
case 1:
parsedVersionCeiling.Major += 1
case 2:
parsedVersionCeiling.Minor += 1
default:
parsedVersionCeiling.Patch += 1
}
versionFamilyRange, err := semver.ParseRange(fmt.Sprintf(">=%s <%s", parsedVersion.String(), parsedVersionCeiling.String()))
if err != nil {
return StemcellVersions{}, err
}
filteredStemcells := StemcellVersions{}
for _, s := range stemcells {
v, err := semver.ParseTolerant(s["version"])
if err != nil {
return StemcellVersions{}, err
}
if versionFamilyRange(v) {
filteredStemcells = append(filteredStemcells, s)
}
}
return filteredStemcells, nil
}
func (f Filter) selectVersionsGreaterThanInitial(stemcells StemcellVersions) (StemcellVersions, error) {
parsedInitialVersion, err := semver.ParseTolerant(f.initialVersion)
if err != nil {
return StemcellVersions{}, nil
}
greaterThanInitial, err := semver.ParseRange(fmt.Sprintf(">=%s", parsedInitialVersion.String()))
if err != nil {
return StemcellVersions{}, nil
}
filteredStemcells := StemcellVersions{}
for _, s := range stemcells {
v, err := semver.ParseTolerant(s["version"])
if err != nil {
return StemcellVersions{}, nil
}
if greaterThanInitial(v) {
filteredStemcells = append(filteredStemcells, s)
}
}
return filteredStemcells, nil
}
func (sv StemcellVersions) Len() int {
return len(sv)
}
func (sv StemcellVersions) Swap(i, j int) {
sv[i], sv[j] = sv[j], sv[i]
}
func (sv StemcellVersions) Less(i, j int) bool {
first, err := semver.ParseTolerant(sv[i]["version"])
if err != nil {
panic(err)
}
second, err := semver.ParseTolerant(sv[j]["version"])
if err != nil {
panic(err)
}
return first.LT(second)
}