/
resource_types.go
212 lines (174 loc) · 4.81 KB
/
resource_types.go
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package resources
import (
"fmt"
"strings"
"sync"
"time"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/runtime/schema"
"k8s.io/client-go/discovery"
"k8s.io/client-go/kubernetes"
)
type ResourceTypes interface {
All() ([]ResourceType, error)
Find(Resource) (ResourceType, error)
}
type ResourceTypesImpl struct {
coreClient kubernetes.Interface
memoizedResTypes *[]ResourceType
memoizedResTypesLock sync.RWMutex
}
var _ ResourceTypes = &ResourceTypesImpl{}
type ResourceType struct {
schema.GroupVersionResource
metav1.APIResource
}
func NewResourceTypesImpl(coreClient kubernetes.Interface) *ResourceTypesImpl {
return &ResourceTypesImpl{coreClient: coreClient}
}
func (g *ResourceTypesImpl) All() ([]ResourceType, error) {
serverResources, err := g.serverResources()
if err != nil {
return nil, err
}
var pairs []ResourceType
for _, resList := range serverResources {
groupVersion, err := schema.ParseGroupVersion(resList.GroupVersion)
if err != nil {
return nil, err
}
for _, res := range resList.APIResources {
group := groupVersion.Group
if len(res.Group) > 0 {
group = res.Group
}
version := groupVersion.Version
if len(res.Version) > 0 {
version = res.Version
}
// Copy down group and version for convenience
res.Group = group
res.Version = version
gvr := schema.GroupVersionResource{Group: group, Version: version, Resource: res.Name}
pairs = append(pairs, ResourceType{gvr, res})
}
}
return pairs, nil
}
func (g *ResourceTypesImpl) serverResources() ([]*metav1.APIResourceList, error) {
var lastError error
for i := 0; i < 5; i++ {
serverResources, err := g.coreClient.Discovery().ServerResources()
if err == nil {
return serverResources, nil
}
lastError = err
time.Sleep(1 * time.Second)
}
if discovery.IsGroupDiscoveryFailedError(lastError) {
lastError = fmt.Errorf("%s (possibly related issue: https://github.com/k14s/kapp/issues/12)", lastError)
}
return nil, lastError
}
func (g *ResourceTypesImpl) memoizedAll() ([]ResourceType, error) {
g.memoizedResTypesLock.RLock()
if g.memoizedResTypes != nil {
defer g.memoizedResTypesLock.RUnlock()
return *g.memoizedResTypes, nil
}
g.memoizedResTypesLock.RUnlock()
// Include call to All within a lock to avoid race
// with competing memoizedAll() call that
// may win and save older copy on res types
g.memoizedResTypesLock.Lock()
defer g.memoizedResTypesLock.Unlock()
resTypes, err := g.All()
if err != nil {
return nil, err
}
g.memoizedResTypes = &resTypes
return resTypes, nil
}
func (g *ResourceTypesImpl) Find(resource Resource) (ResourceType, error) {
resType, err := g.findOnce(resource)
if err != nil {
g.memoizedResTypesLock.Lock()
g.memoizedResTypes = nil
g.memoizedResTypesLock.Unlock()
return g.findOnce(resource)
}
return resType, nil
}
type ResourceTypesUnknownTypeErr struct {
resource Resource
}
func (e ResourceTypesUnknownTypeErr) Error() string {
return "Expected to find type for resource: " + e.resource.Description()
}
func (g *ResourceTypesImpl) findOnce(resource Resource) (ResourceType, error) {
pairs, err := g.memoizedAll()
if err != nil {
return ResourceType{}, err
}
pieces := strings.Split(resource.APIVersion(), "/")
if len(pieces) > 2 {
return ResourceType{}, fmt.Errorf("Expected version to be of format group/version")
}
if len(pieces) == 1 {
pieces = []string{"", pieces[0]} // core API group
}
for _, pair := range pairs {
if pair.APIResource.Group == pieces[0] &&
pair.APIResource.Version == pieces[1] &&
pair.APIResource.Kind == resource.Kind() {
return pair, nil
}
}
return ResourceType{}, ResourceTypesUnknownTypeErr{resource}
}
func (p ResourceType) Namespaced() bool {
return p.APIResource.Namespaced
}
func (p ResourceType) Listable() bool {
return p.containsStr(p.APIResource.Verbs, "list")
}
func (p ResourceType) Deletable() bool {
return p.containsStr(p.APIResource.Verbs, "delete")
}
func (p ResourceType) containsStr(s []string, e string) bool {
for _, a := range s {
if a == e {
return true
}
}
return false
}
func Listable(in []ResourceType) []ResourceType {
var out []ResourceType
for _, item := range in {
if item.Listable() {
out = append(out, item)
}
}
return out
}
func Matching(in []ResourceType, ref ResourceRef) []ResourceType {
partResourceRef := PartialResourceRef{ref.GroupVersionResource}
var out []ResourceType
for _, item := range in {
if partResourceRef.Matches(item.GroupVersionResource) {
out = append(out, item)
}
}
return out
}
func NonMatching(in []ResourceType, ref ResourceRef) []ResourceType {
partResourceRef := PartialResourceRef{ref.GroupVersionResource}
var out []ResourceType
for _, item := range in {
if !partResourceRef.Matches(item.GroupVersionResource) {
out = append(out, item)
}
}
return out
}