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discovery.go
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discovery.go
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package restmapper
import (
"sync"
kapi "k8s.io/kubernetes/pkg/api"
"k8s.io/kubernetes/pkg/api/meta"
"k8s.io/kubernetes/pkg/api/unversioned"
"k8s.io/kubernetes/pkg/apimachinery/registered"
"k8s.io/kubernetes/pkg/client/typed/discovery"
)
type discoveryRESTMapper struct {
discoveryClient discovery.DiscoveryInterface
delegate meta.RESTMapper
initLock sync.Mutex
}
// NewDiscoveryRESTMapper that initializes using the discovery APIs, relying on group ordering and preferred versions
// to build its appropriate priorities. Only versions are registered with API machinery are added now.
// TODO make this work with generic resources at some point. For now, this handles enabled and disabled resources cleanly.
func NewDiscoveryRESTMapper(discoveryClient discovery.DiscoveryInterface) meta.RESTMapper {
return &discoveryRESTMapper{discoveryClient: discoveryClient}
}
func (d *discoveryRESTMapper) getDelegate() (meta.RESTMapper, error) {
d.initLock.Lock()
defer d.initLock.Unlock()
if d.delegate != nil {
return d.delegate, nil
}
serverGroups, err := d.discoveryClient.ServerGroups()
if err != nil {
return nil, err
}
// always prefer our default group for now. The version should be discovered from discovery, but this will hold us
// for quite some time.
resourcePriority := []unversioned.GroupVersionResource{
{Group: kapi.GroupName, Version: meta.AnyVersion, Resource: meta.AnyResource},
}
kindPriority := []unversioned.GroupVersionKind{
{Group: kapi.GroupName, Version: meta.AnyVersion, Kind: meta.AnyKind},
}
groupPriority := []string{}
unionMapper := meta.MultiRESTMapper{}
for _, group := range serverGroups.Groups {
if len(group.Versions) == 0 {
continue
}
groupPriority = append(groupPriority, group.Name)
if len(group.PreferredVersion.Version) != 0 {
preferredVersion := unversioned.GroupVersion{Group: group.Name, Version: group.PreferredVersion.Version}
if registered.IsEnabledVersion(preferredVersion) {
resourcePriority = append(resourcePriority, preferredVersion.WithResource(meta.AnyResource))
kindPriority = append(kindPriority, preferredVersion.WithKind(meta.AnyKind))
}
}
for _, discoveryVersion := range group.Versions {
version := unversioned.GroupVersion{Group: group.Name, Version: discoveryVersion.Version}
if !registered.IsEnabledVersion(version) {
continue
}
groupMeta, err := registered.Group(group.Name)
if err != nil {
return nil, err
}
resources, err := d.discoveryClient.ServerResourcesForGroupVersion(version.String())
if err != nil {
return nil, err
}
versionMapper := meta.NewDefaultRESTMapper([]unversioned.GroupVersion{version}, groupMeta.InterfacesFor)
for _, resource := range resources.APIResources {
// TODO properly handle resource versus kind
gvk := version.WithKind(resource.Kind)
scope := meta.RESTScopeNamespace
if !resource.Namespaced {
scope = meta.RESTScopeRoot
}
versionMapper.Add(gvk, scope)
// TODO formalize this by checking to see if they support listing
versionMapper.Add(version.WithKind(resource.Kind+"List"), scope)
}
// we need to add List. Its a special case of something we need that isn't in the discovery doc
if group.Name == kapi.GroupName {
versionMapper.Add(version.WithKind("List"), meta.RESTScopeNamespace)
}
unionMapper = append(unionMapper, versionMapper)
}
}
for _, group := range groupPriority {
resourcePriority = append(resourcePriority, unversioned.GroupVersionResource{Group: group, Version: meta.AnyVersion, Resource: meta.AnyResource})
kindPriority = append(kindPriority, unversioned.GroupVersionKind{Group: group, Version: meta.AnyVersion, Kind: meta.AnyKind})
}
d.delegate = meta.PriorityRESTMapper{Delegate: unionMapper, ResourcePriority: resourcePriority, KindPriority: kindPriority}
return d.delegate, nil
}
func (d *discoveryRESTMapper) KindFor(resource unversioned.GroupVersionResource) (unversioned.GroupVersionKind, error) {
delegate, err := d.getDelegate()
if err != nil {
return unversioned.GroupVersionKind{}, err
}
return delegate.KindFor(resource)
}
func (d *discoveryRESTMapper) KindsFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error) {
delegate, err := d.getDelegate()
if err != nil {
return nil, err
}
return delegate.KindsFor(resource)
}
func (d *discoveryRESTMapper) ResourceFor(input unversioned.GroupVersionResource) (unversioned.GroupVersionResource, error) {
delegate, err := d.getDelegate()
if err != nil {
return unversioned.GroupVersionResource{}, err
}
return delegate.ResourceFor(input)
}
func (d *discoveryRESTMapper) ResourcesFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
delegate, err := d.getDelegate()
if err != nil {
return nil, err
}
return delegate.ResourcesFor(input)
}
func (d *discoveryRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (*meta.RESTMapping, error) {
delegate, err := d.getDelegate()
if err != nil {
return nil, err
}
return delegate.RESTMapping(gk, versions...)
}
func (d *discoveryRESTMapper) RESTMappings(gk unversioned.GroupKind) ([]*meta.RESTMapping, error) {
delegate, err := d.getDelegate()
if err != nil {
return nil, err
}
return delegate.RESTMappings(gk)
}
func (d *discoveryRESTMapper) AliasesForResource(resource string) ([]string, bool) {
delegate, err := d.getDelegate()
if err != nil {
return nil, false
}
return delegate.AliasesForResource(resource)
}
func (d *discoveryRESTMapper) ResourceSingularizer(resource string) (singular string, err error) {
delegate, err := d.getDelegate()
if err != nil {
return resource, err
}
return delegate.ResourceSingularizer(resource)
}