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gvpackages.go
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/
gvpackages.go
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/*
Copyright 2017 The Kubernetes Authors.
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package args
import (
"bytes"
"encoding/csv"
"flag"
"path"
"strings"
"path/filepath"
"sort"
"k8s.io/code-generator/cmd/client-gen/types"
)
type gvPackagesValue struct {
gvToPath *map[types.GroupVersion]string
groups *[]types.GroupVersions
changed bool
}
func NewGVPackagesValue(gvToPath *map[types.GroupVersion]string, groups *[]types.GroupVersions, def []string) *gvPackagesValue {
gvp := new(gvPackagesValue)
gvp.gvToPath = gvToPath
gvp.groups = groups
if def != nil {
if err := gvp.set(def); err != nil {
panic(err)
}
}
return gvp
}
var _ flag.Value = &gvPackagesValue{}
func readAsCSV(val string) ([]string, error) {
if val == "" {
return []string{}, nil
}
stringReader := strings.NewReader(val)
csvReader := csv.NewReader(stringReader)
return csvReader.Read()
}
func writeAsCSV(vals []string) (string, error) {
b := &bytes.Buffer{}
w := csv.NewWriter(b)
err := w.Write(vals)
if err != nil {
return "", err
}
w.Flush()
return strings.TrimSuffix(b.String(), "\n"), nil
}
func (s *gvPackagesValue) set(vs []string) error {
if !s.changed {
*s.gvToPath = map[types.GroupVersion]string{}
*s.groups = []types.GroupVersions{}
}
var seenGroups = make(map[types.Group]*types.GroupVersions)
for _, g := range *s.groups {
seenGroups[g.Group] = &g
}
for _, v := range vs {
pth, gvString := parsePathGroupVersion(v)
gv, err := types.ToGroupVersion(gvString)
if err != nil {
return err
}
if group, ok := seenGroups[gv.Group]; ok {
seenGroups[gv.Group].Versions = append(group.Versions, gv.Version)
} else {
seenGroups[gv.Group] = &types.GroupVersions{
PackageName: gv.Group.NonEmpty(),
Group: gv.Group,
Versions: []types.Version{gv.Version},
}
}
(*s.gvToPath)[gv] = groupVersionPath(pth, gv.Group.String(), gv.Version.String())
}
var groupNames []string
for groupName := range seenGroups {
groupNames = append(groupNames, groupName.String())
}
sort.Strings(groupNames)
*s.groups = []types.GroupVersions{}
for _, groupName := range groupNames {
*s.groups = append(*s.groups, *seenGroups[types.Group(groupName)])
}
return nil
}
func (s *gvPackagesValue) Set(val string) error {
vs, err := readAsCSV(val)
if err != nil {
return err
}
if err := s.set(vs); err != nil {
return err
}
s.changed = true
return nil
}
func (s *gvPackagesValue) Type() string {
return "stringSlice"
}
func (s *gvPackagesValue) String() string {
strs := make([]string, 0, len(*s.gvToPath))
for gv, pth := range *s.gvToPath {
strs = append(strs, path.Join(pth, gv.Group.String(), gv.Version.String()))
}
str, _ := writeAsCSV(strs)
return "[" + str + "]"
}
func parsePathGroupVersion(pgvString string) (gvPath string, gvString string) {
subs := strings.Split(pgvString, "/")
length := len(subs)
switch length {
case 0, 1, 2:
return "", pgvString
default:
return strings.Join(subs[:length-2], "/"), strings.Join(subs[length-2:], "/")
}
}
func groupVersionPath(gvPath string, group string, version string) (path string) {
// special case for the core group
if group == "api" {
path = filepath.Join("core", version)
} else {
path = filepath.Join(gvPath, group, version)
}
return
}