mirror of
https://github.com/k3s-io/kubernetes.git
synced 2025-07-23 03:41:45 +00:00
Merge pull request #35418 from sttts/sttts-discovery-cache
Automatic merge from submit-queue
Add caching for discovery info with invalidation on cache-miss
TODO:
- [x] write tests for `CachedDiscoveryClient`
- [x] write tests for `DeferredDiscoveryRESTMapper` on cache-miss
- [x] find better way/structure to get rid of `invalidateCh` in c06ba3175b
This commit is contained in:
Kubernetes Submit Queue
GitHub
commit
f7e0c6c19e
@ -32,6 +32,7 @@ go_library(
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"//pkg/version:go_default_library",
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"//plugin/pkg/client/auth:go_default_library",
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"//vendor:github.com/emicklei/go-restful/swagger",
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"//vendor:github.com/golang/glog",
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],
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)
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@ -44,11 +45,15 @@ go_test(
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library = "go_default_library",
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tags = ["automanaged"],
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deps = [
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"//pkg/api/errors:go_default_library",
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"//pkg/api/unversioned:go_default_library",
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"//pkg/api/v1:go_default_library",
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"//pkg/apimachinery/registered:go_default_library",
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"//pkg/client/restclient:go_default_library",
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"//pkg/client/restclient/fake:go_default_library",
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"//pkg/version:go_default_library",
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"//vendor:github.com/emicklei/go-restful/swagger",
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"//vendor:github.com/stretchr/testify/assert",
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],
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)
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@ -45,6 +45,15 @@ type DiscoveryInterface interface {
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SwaggerSchemaInterface
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}
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// CachedDiscoveryInterface is a DiscoveryInterface with cache invalidation and freshness.
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type CachedDiscoveryInterface interface {
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DiscoveryInterface
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// Fresh returns true if no cached data was used that had been retrieved before the instantiation.
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Fresh() bool
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// Invalidate enforces that no cached data is used in the future that is older than the current time.
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Invalidate()
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}
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// ServerGroupsInterface has methods for obtaining supported groups on the API server
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type ServerGroupsInterface interface {
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// ServerGroups returns the supported groups, with information like supported versions and the
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@ -23,6 +23,8 @@ import (
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/meta"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"github.com/golang/glog"
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)
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// APIGroupResources is an API group with a mapping of versions to
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@ -35,7 +37,7 @@ type APIGroupResources struct {
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}
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// NewRESTMapper returns a PriorityRESTMapper based on the discovered
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// groups and resourced passed in.
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// groups and resources passed in.
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func NewRESTMapper(groupResources []*APIGroupResources, versionInterfaces meta.VersionInterfacesFunc) meta.RESTMapper {
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unionMapper := meta.MultiRESTMapper{}
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@ -47,8 +49,8 @@ func NewRESTMapper(groupResources []*APIGroupResources, versionInterfaces meta.V
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groupPriority = append(groupPriority, group.Group.Name)
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if len(group.Group.PreferredVersion.Version) != 0 {
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preffered := group.Group.PreferredVersion.Version
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if _, ok := group.VersionedResources[preffered]; ok {
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preferred := group.Group.PreferredVersion.Version
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if _, ok := group.VersionedResources[preferred]; ok {
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resourcePriority = append(resourcePriority, unversioned.GroupVersionResource{
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Group: group.Group.Name,
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Version: group.Group.PreferredVersion.Version,
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@ -141,14 +143,14 @@ func GetAPIGroupResources(cl DiscoveryInterface) ([]*APIGroupResources, error) {
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type DeferredDiscoveryRESTMapper struct {
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initMu sync.Mutex
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delegate meta.RESTMapper
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cl DiscoveryInterface
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cl CachedDiscoveryInterface
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versionInterface meta.VersionInterfacesFunc
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}
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// NewDeferredDiscoveryRESTMapper returns a
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// DeferredDiscoveryRESTMapper that will lazily query the provided
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// client for discovery information to do REST mappings.
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func NewDeferredDiscoveryRESTMapper(cl DiscoveryInterface, versionInterface meta.VersionInterfacesFunc) *DeferredDiscoveryRESTMapper {
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func NewDeferredDiscoveryRESTMapper(cl CachedDiscoveryInterface, versionInterface meta.VersionInterfacesFunc) *DeferredDiscoveryRESTMapper {
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return &DeferredDiscoveryRESTMapper{
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cl: cl,
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versionInterface: versionInterface,
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@ -175,79 +177,118 @@ func (d *DeferredDiscoveryRESTMapper) getDelegate() (meta.RESTMapper, error) {
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// Reset resets the internally cached Discovery information and will
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// cause the next mapping request to re-discover.
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func (d *DeferredDiscoveryRESTMapper) Reset() {
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glog.V(5).Info("Invalidating discovery information")
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d.initMu.Lock()
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defer d.initMu.Unlock()
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d.cl.Invalidate()
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d.delegate = nil
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d.initMu.Unlock()
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}
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// KindFor takes a partial resource and returns back the single match.
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// It returns an error if there are multiple matches.
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func (d *DeferredDiscoveryRESTMapper) KindFor(resource unversioned.GroupVersionResource) (unversioned.GroupVersionKind, error) {
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func (d *DeferredDiscoveryRESTMapper) KindFor(resource unversioned.GroupVersionResource) (gvk unversioned.GroupVersionKind, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return unversioned.GroupVersionKind{}, err
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}
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return del.KindFor(resource)
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gvk, err = del.KindFor(resource)
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if err != nil && !d.cl.Fresh() {
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d.Reset()
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gvk, err = d.KindFor(resource)
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}
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return
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}
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// KindsFor takes a partial resource and returns back the list of
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// potential kinds in priority order.
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func (d *DeferredDiscoveryRESTMapper) KindsFor(resource unversioned.GroupVersionResource) ([]unversioned.GroupVersionKind, error) {
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func (d *DeferredDiscoveryRESTMapper) KindsFor(resource unversioned.GroupVersionResource) (gvks []unversioned.GroupVersionKind, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return nil, err
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}
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return del.KindsFor(resource)
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gvks, err = del.KindsFor(resource)
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if len(gvks) == 0 && !d.cl.Fresh() {
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d.Reset()
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gvks, err = d.KindsFor(resource)
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}
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return
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}
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// ResourceFor takes a partial resource and returns back the single
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// match. It returns an error if there are multiple matches.
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func (d *DeferredDiscoveryRESTMapper) ResourceFor(input unversioned.GroupVersionResource) (unversioned.GroupVersionResource, error) {
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func (d *DeferredDiscoveryRESTMapper) ResourceFor(input unversioned.GroupVersionResource) (gvr unversioned.GroupVersionResource, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return unversioned.GroupVersionResource{}, err
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}
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return del.ResourceFor(input)
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gvr, err = del.ResourceFor(input)
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if err != nil && !d.cl.Fresh() {
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d.Reset()
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gvr, err = d.ResourceFor(input)
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}
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return
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}
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// ResourcesFor takes a partial resource and returns back the list of
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// potential resource in priority order.
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func (d *DeferredDiscoveryRESTMapper) ResourcesFor(input unversioned.GroupVersionResource) ([]unversioned.GroupVersionResource, error) {
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func (d *DeferredDiscoveryRESTMapper) ResourcesFor(input unversioned.GroupVersionResource) (gvrs []unversioned.GroupVersionResource, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return nil, err
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}
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return del.ResourcesFor(input)
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gvrs, err = del.ResourcesFor(input)
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if len(gvrs) == 0 && !d.cl.Fresh() {
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d.Reset()
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gvrs, err = d.ResourcesFor(input)
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}
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return
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}
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// RESTMapping identifies a preferred resource mapping for the
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// provided group kind.
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func (d *DeferredDiscoveryRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (*meta.RESTMapping, error) {
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func (d *DeferredDiscoveryRESTMapper) RESTMapping(gk unversioned.GroupKind, versions ...string) (m *meta.RESTMapping, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return nil, err
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}
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return del.RESTMapping(gk, versions...)
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m, err = del.RESTMapping(gk, versions...)
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if err != nil && !d.cl.Fresh() {
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d.Reset()
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m, err = d.RESTMapping(gk, versions...)
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}
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return
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}
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// RESTMappings returns the RESTMappings for the provided group kind
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// in a rough internal preferred order. If no kind is found, it will
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// return a NoResourceMatchError.
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func (d *DeferredDiscoveryRESTMapper) RESTMappings(gk unversioned.GroupKind) ([]*meta.RESTMapping, error) {
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func (d *DeferredDiscoveryRESTMapper) RESTMappings(gk unversioned.GroupKind) (ms []*meta.RESTMapping, err error) {
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del, err := d.getDelegate()
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if err != nil {
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return nil, err
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}
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return del.RESTMappings(gk)
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ms, err = del.RESTMappings(gk)
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if len(ms) == 0 && !d.cl.Fresh() {
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d.Reset()
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ms, err = d.RESTMappings(gk)
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}
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return
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}
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// AliasesForResource returns whether a resource has an alias or not.
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func (d *DeferredDiscoveryRESTMapper) AliasesForResource(resource string) ([]string, bool) {
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func (d *DeferredDiscoveryRESTMapper) AliasesForResource(resource string) (as []string, ok bool) {
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del, err := d.getDelegate()
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if err != nil {
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return nil, false
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}
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return del.AliasesForResource(resource)
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as, ok = del.AliasesForResource(resource)
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if len(as) == 0 && !d.cl.Fresh() {
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d.Reset()
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as, ok = d.AliasesForResource(resource)
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}
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return
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}
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// ResourceSingularizer converts a resource name from plural to
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@ -257,7 +298,12 @@ func (d *DeferredDiscoveryRESTMapper) ResourceSingularizer(resource string) (sin
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if err != nil {
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return resource, err
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}
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return del.ResourceSingularizer(resource)
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singular, err = del.ResourceSingularizer(resource)
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if err != nil && !d.cl.Fresh() {
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d.Reset()
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singular, err = d.ResourceSingularizer(resource)
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}
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return
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}
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func (d *DeferredDiscoveryRESTMapper) String() string {
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@ -20,7 +20,15 @@ import (
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"reflect"
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"testing"
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"k8s.io/kubernetes/pkg/api/errors"
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"k8s.io/kubernetes/pkg/api/unversioned"
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"k8s.io/kubernetes/pkg/apimachinery/registered"
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"k8s.io/kubernetes/pkg/client/restclient"
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"k8s.io/kubernetes/pkg/client/restclient/fake"
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"k8s.io/kubernetes/pkg/version"
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"github.com/emicklei/go-restful/swagger"
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"github.com/stretchr/testify/assert"
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)
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func TestRESTMapper(t *testing.T) {
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@ -174,3 +182,144 @@ func TestRESTMapper(t *testing.T) {
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}
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}
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}
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func TestDeferredDiscoveryRESTMapper_CacheMiss(t *testing.T) {
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assert := assert.New(t)
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cdc := fakeCachedDiscoveryInterface{fresh: false}
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m := NewDeferredDiscoveryRESTMapper(&cdc, registered.InterfacesFor)
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assert.False(cdc.fresh, "should NOT be fresh after instantiation")
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assert.Zero(cdc.invalidateCalls, "should not have called Invalidate()")
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gvk, err := m.KindFor(unversioned.GroupVersionResource{
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Group: "a",
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Version: "v1",
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Resource: "foo",
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})
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assert.NoError(err)
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assert.True(cdc.fresh, "should be fresh after a cache-miss")
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assert.Equal(cdc.invalidateCalls, 1, "should have called Invalidate() once")
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assert.Equal(gvk.Kind, "Foo")
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gvk, err = m.KindFor(unversioned.GroupVersionResource{
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Group: "a",
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Version: "v1",
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Resource: "foo",
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})
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assert.NoError(err)
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assert.Equal(cdc.invalidateCalls, 1, "should NOT have called Invalidate() again")
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gvk, err = m.KindFor(unversioned.GroupVersionResource{
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Group: "a",
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Version: "v1",
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Resource: "bar",
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})
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assert.Error(err)
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assert.Equal(cdc.invalidateCalls, 1, "should NOT have called Invalidate() again after another cache-miss, but with fresh==true")
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cdc.fresh = false
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gvk, err = m.KindFor(unversioned.GroupVersionResource{
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Group: "a",
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Version: "v1",
|
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Resource: "bar",
|
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})
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assert.Error(err)
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assert.Equal(cdc.invalidateCalls, 2, "should HAVE called Invalidate() again after another cache-miss, but with fresh==false")
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}
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|
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type fakeCachedDiscoveryInterface struct {
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invalidateCalls int
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fresh bool
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enabledA bool
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}
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|
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var _ CachedDiscoveryInterface = &fakeCachedDiscoveryInterface{}
|
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|
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func (c *fakeCachedDiscoveryInterface) Fresh() bool {
|
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return c.fresh
|
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}
|
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|
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func (c *fakeCachedDiscoveryInterface) Invalidate() {
|
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c.invalidateCalls = c.invalidateCalls + 1
|
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c.fresh = true
|
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c.enabledA = true
|
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}
|
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|
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func (c *fakeCachedDiscoveryInterface) RESTClient() restclient.Interface {
|
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return &fake.RESTClient{}
|
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}
|
||||
|
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func (c *fakeCachedDiscoveryInterface) ServerGroups() (*unversioned.APIGroupList, error) {
|
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if c.enabledA {
|
||||
return &unversioned.APIGroupList{
|
||||
Groups: []unversioned.APIGroup{
|
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{
|
||||
Name: "a",
|
||||
Versions: []unversioned.GroupVersionForDiscovery{
|
||||
{
|
||||
GroupVersion: "a/v1",
|
||||
Version: "v1",
|
||||
},
|
||||
},
|
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PreferredVersion: unversioned.GroupVersionForDiscovery{
|
||||
GroupVersion: "a/v1",
|
||||
Version: "v1",
|
||||
},
|
||||
},
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
return &unversioned.APIGroupList{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) ServerResourcesForGroupVersion(groupVersion string) (*unversioned.APIResourceList, error) {
|
||||
if c.enabledA && groupVersion == "a/v1" {
|
||||
return &unversioned.APIResourceList{
|
||||
GroupVersion: "a/v1",
|
||||
APIResources: []unversioned.APIResource{
|
||||
{
|
||||
Name: "foo",
|
||||
Kind: "Foo",
|
||||
Namespaced: false,
|
||||
},
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
|
||||
return nil, errors.NewNotFound(unversioned.GroupResource{}, "")
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) ServerResources() (map[string]*unversioned.APIResourceList, error) {
|
||||
if c.enabledA {
|
||||
av1, _ := c.ServerResourcesForGroupVersion("a/v1")
|
||||
return map[string]*unversioned.APIResourceList{
|
||||
"a/v1": av1,
|
||||
}, nil
|
||||
}
|
||||
return map[string]*unversioned.APIResourceList{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) ServerPreferredResources() ([]unversioned.GroupVersionResource, error) {
|
||||
if c.enabledA {
|
||||
return []unversioned.GroupVersionResource{
|
||||
{
|
||||
Group: "a",
|
||||
Version: "v1",
|
||||
Resource: "foo",
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
return []unversioned.GroupVersionResource{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) ServerPreferredNamespacedResources() ([]unversioned.GroupVersionResource, error) {
|
||||
return []unversioned.GroupVersionResource{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) ServerVersion() (*version.Info, error) {
|
||||
return &version.Info{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeCachedDiscoveryInterface) SwaggerSchema(version unversioned.GroupVersion) (*swagger.ApiDeclaration, error) {
|
||||
return &swagger.ApiDeclaration{}, nil
|
||||
}
|
||||
|
||||
@ -133,6 +133,17 @@ func newExternalScheme() (*runtime.Scheme, meta.RESTMapper, runtime.Codec) {
|
||||
return scheme, mapper, codec
|
||||
}
|
||||
|
||||
type fakeCachedDiscoveryClient struct {
|
||||
discovery.DiscoveryInterface
|
||||
}
|
||||
|
||||
func (d *fakeCachedDiscoveryClient) Fresh() bool {
|
||||
return true
|
||||
}
|
||||
|
||||
func (d *fakeCachedDiscoveryClient) Invalidate() {
|
||||
}
|
||||
|
||||
type TestFactory struct {
|
||||
Mapper meta.RESTMapper
|
||||
Typer runtime.ObjectTyper
|
||||
@ -164,6 +175,14 @@ func NewTestFactory() (cmdutil.Factory, *TestFactory, runtime.Codec, runtime.Neg
|
||||
}, t, codec, negotiatedSerializer
|
||||
}
|
||||
|
||||
func (f *FakeFactory) DiscoveryClient() (discovery.CachedDiscoveryInterface, error) {
|
||||
discoveryClient, err := discovery.NewDiscoveryClientForConfig(f.tf.ClientConfig)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
return &fakeCachedDiscoveryClient{DiscoveryInterface: discoveryClient}, nil
|
||||
}
|
||||
|
||||
func (f *FakeFactory) FlagSet() *pflag.FlagSet {
|
||||
return nil
|
||||
}
|
||||
|
||||
@ -13,6 +13,7 @@ load(
|
||||
go_library(
|
||||
name = "go_default_library",
|
||||
srcs = [
|
||||
"cached_discovery.go",
|
||||
"clientcache.go",
|
||||
"factory.go",
|
||||
"helpers.go",
|
||||
@ -50,8 +51,10 @@ go_library(
|
||||
"//pkg/util/errors:go_default_library",
|
||||
"//pkg/util/exec:go_default_library",
|
||||
"//pkg/util/flag:go_default_library",
|
||||
"//pkg/util/homedir:go_default_library",
|
||||
"//pkg/util/sets:go_default_library",
|
||||
"//pkg/util/strategicpatch:go_default_library",
|
||||
"//pkg/version:go_default_library",
|
||||
"//pkg/watch:go_default_library",
|
||||
"//vendor:github.com/emicklei/go-restful/swagger",
|
||||
"//vendor:github.com/evanphx/json-patch",
|
||||
@ -64,6 +67,7 @@ go_library(
|
||||
go_test(
|
||||
name = "go_default_test",
|
||||
srcs = [
|
||||
"cached_discovery_test.go",
|
||||
"factory_test.go",
|
||||
"helpers_test.go",
|
||||
"shortcut_restmapper_test.go",
|
||||
@ -85,8 +89,10 @@ go_test(
|
||||
"//pkg/apimachinery/registered:go_default_library",
|
||||
"//pkg/apis/extensions:go_default_library",
|
||||
"//pkg/client/clientset_generated/internalclientset/fake:go_default_library",
|
||||
"//pkg/client/restclient:go_default_library",
|
||||
"//pkg/client/restclient/fake:go_default_library",
|
||||
"//pkg/client/testing/core:go_default_library",
|
||||
"//pkg/client/typed/discovery:go_default_library",
|
||||
"//pkg/client/unversioned/clientcmd:go_default_library",
|
||||
"//pkg/client/unversioned/clientcmd/api:go_default_library",
|
||||
"//pkg/controller:go_default_library",
|
||||
@ -97,6 +103,9 @@ go_test(
|
||||
"//pkg/util/exec:go_default_library",
|
||||
"//pkg/util/flag:go_default_library",
|
||||
"//pkg/util/validation/field:go_default_library",
|
||||
"//pkg/version:go_default_library",
|
||||
"//pkg/watch:go_default_library",
|
||||
"//vendor:github.com/emicklei/go-restful/swagger",
|
||||
"//vendor:github.com/stretchr/testify/assert",
|
||||
],
|
||||
)
|
||||
|
||||
252
pkg/kubectl/cmd/util/cached_discovery.go
Normal file
252
pkg/kubectl/cmd/util/cached_discovery.go
Normal file
@ -0,0 +1,252 @@
|
||||
/*
|
||||
Copyright 2016 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 util
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"path/filepath"
|
||||
"sync"
|
||||
"time"
|
||||
|
||||
"github.com/emicklei/go-restful/swagger"
|
||||
"github.com/golang/glog"
|
||||
|
||||
"k8s.io/kubernetes/pkg/api"
|
||||
"k8s.io/kubernetes/pkg/api/unversioned"
|
||||
"k8s.io/kubernetes/pkg/client/restclient"
|
||||
"k8s.io/kubernetes/pkg/client/typed/discovery"
|
||||
"k8s.io/kubernetes/pkg/runtime"
|
||||
"k8s.io/kubernetes/pkg/version"
|
||||
)
|
||||
|
||||
// CachedDiscoveryClient implements the functions that discovery server-supported API groups,
|
||||
// versions and resources.
|
||||
type CachedDiscoveryClient struct {
|
||||
delegate discovery.DiscoveryInterface
|
||||
|
||||
// cacheDirectory is the directory where discovery docs are held. It must be unique per host:port combination to work well.
|
||||
cacheDirectory string
|
||||
|
||||
// ttl is how long the cache should be considered valid
|
||||
ttl time.Duration
|
||||
|
||||
// mutex protects the variables below
|
||||
mutex sync.Mutex
|
||||
|
||||
// ourFiles are all filenames of cache files created by this process
|
||||
ourFiles map[string]struct{}
|
||||
// invalidated is true if all cache files should be ignored that are not ours (e.g. after Invalidate() was called)
|
||||
invalidated bool
|
||||
// fresh is true if all used cache files were ours
|
||||
fresh bool
|
||||
}
|
||||
|
||||
var _ discovery.CachedDiscoveryInterface = &CachedDiscoveryClient{}
|
||||
|
||||
// ServerResourcesForGroupVersion returns the supported resources for a group and version.
|
||||
func (d *CachedDiscoveryClient) ServerResourcesForGroupVersion(groupVersion string) (*unversioned.APIResourceList, error) {
|
||||
filename := filepath.Join(d.cacheDirectory, groupVersion, "serverresources.json")
|
||||
cachedBytes, err := d.getCachedFile(filename)
|
||||
// don't fail on errors, we either don't have a file or won't be able to run the cached check. Either way we can fallback.
|
||||
if err == nil {
|
||||
cachedResources := &unversioned.APIResourceList{}
|
||||
if err := runtime.DecodeInto(api.Codecs.UniversalDecoder(), cachedBytes, cachedResources); err == nil {
|
||||
glog.V(6).Infof("returning cached discovery info from %v", filename)
|
||||
return cachedResources, nil
|
||||
}
|
||||
}
|
||||
|
||||
liveResources, err := d.delegate.ServerResourcesForGroupVersion(groupVersion)
|
||||
if err != nil {
|
||||
return liveResources, err
|
||||
}
|
||||
|
||||
if err := d.writeCachedFile(filename, liveResources); err != nil {
|
||||
glog.V(3).Infof("failed to write cache to %v due to %v", filename, err)
|
||||
}
|
||||
|
||||
return liveResources, nil
|
||||
}
|
||||
|
||||
// ServerResources returns the supported resources for all groups and versions.
|
||||
func (d *CachedDiscoveryClient) ServerResources() (map[string]*unversioned.APIResourceList, error) {
|
||||
apiGroups, err := d.ServerGroups()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
groupVersions := unversioned.ExtractGroupVersions(apiGroups)
|
||||
result := map[string]*unversioned.APIResourceList{}
|
||||
for _, groupVersion := range groupVersions {
|
||||
resources, err := d.ServerResourcesForGroupVersion(groupVersion)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
result[groupVersion] = resources
|
||||
}
|
||||
return result, nil
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) ServerGroups() (*unversioned.APIGroupList, error) {
|
||||
filename := filepath.Join(d.cacheDirectory, "servergroups.json")
|
||||
cachedBytes, err := d.getCachedFile(filename)
|
||||
// don't fail on errors, we either don't have a file or won't be able to run the cached check. Either way we can fallback.
|
||||
if err == nil {
|
||||
cachedGroups := &unversioned.APIGroupList{}
|
||||
if err := runtime.DecodeInto(api.Codecs.UniversalDecoder(), cachedBytes, cachedGroups); err == nil {
|
||||
glog.V(6).Infof("returning cached discovery info from %v", filename)
|
||||
return cachedGroups, nil
|
||||
}
|
||||
}
|
||||
|
||||
liveGroups, err := d.delegate.ServerGroups()
|
||||
if err != nil {
|
||||
return liveGroups, err
|
||||
}
|
||||
|
||||
if err := d.writeCachedFile(filename, liveGroups); err != nil {
|
||||
glog.V(3).Infof("failed to write cache to %v due to %v", filename, err)
|
||||
}
|
||||
|
||||
return liveGroups, nil
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) getCachedFile(filename string) ([]byte, error) {
|
||||
// after invalidation ignore cache files not created by this process
|
||||
d.mutex.Lock()
|
||||
_, ourFile := d.ourFiles[filename]
|
||||
if d.invalidated && !ourFile {
|
||||
d.mutex.Unlock()
|
||||
return nil, errors.New("cache invalidated")
|
||||
}
|
||||
d.mutex.Unlock()
|
||||
|
||||
file, err := os.Open(filename)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
fileInfo, err := file.Stat()
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
if time.Now().After(fileInfo.ModTime().Add(d.ttl)) {
|
||||
return nil, errors.New("cache expired")
|
||||
}
|
||||
|
||||
// the cache is present and its valid. Try to read and use it.
|
||||
cachedBytes, err := ioutil.ReadAll(file)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
d.mutex.Lock()
|
||||
defer d.mutex.Unlock()
|
||||
d.fresh = d.fresh && ourFile
|
||||
|
||||
return cachedBytes, nil
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) writeCachedFile(filename string, obj runtime.Object) error {
|
||||
if err := os.MkdirAll(filepath.Dir(filename), 0755); err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
bytes, err := runtime.Encode(api.Codecs.LegacyCodec(), obj)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
f, err := ioutil.TempFile(filepath.Dir(filename), filepath.Base(filename)+".")
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
defer os.Remove(f.Name())
|
||||
_, err = f.Write(bytes)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
err = f.Chmod(0755)
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
name := f.Name()
|
||||
err = f.Close()
|
||||
if err != nil {
|
||||
return err
|
||||
}
|
||||
|
||||
// atomic rename
|
||||
d.mutex.Lock()
|
||||
defer d.mutex.Unlock()
|
||||
err = os.Rename(name, filename)
|
||||
if err == nil {
|
||||
d.ourFiles[filename] = struct{}{}
|
||||
}
|
||||
return err
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) RESTClient() restclient.Interface {
|
||||
return d.delegate.RESTClient()
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) ServerPreferredResources() ([]unversioned.GroupVersionResource, error) {
|
||||
return d.delegate.ServerPreferredResources()
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) ServerPreferredNamespacedResources() ([]unversioned.GroupVersionResource, error) {
|
||||
return d.delegate.ServerPreferredNamespacedResources()
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) ServerVersion() (*version.Info, error) {
|
||||
return d.delegate.ServerVersion()
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) SwaggerSchema(version unversioned.GroupVersion) (*swagger.ApiDeclaration, error) {
|
||||
return d.delegate.SwaggerSchema(version)
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) Fresh() bool {
|
||||
d.mutex.Lock()
|
||||
defer d.mutex.Unlock()
|
||||
|
||||
return d.fresh
|
||||
}
|
||||
|
||||
func (d *CachedDiscoveryClient) Invalidate() {
|
||||
d.mutex.Lock()
|
||||
defer d.mutex.Unlock()
|
||||
|
||||
d.ourFiles = map[string]struct{}{}
|
||||
d.fresh = true
|
||||
d.invalidated = true
|
||||
}
|
||||
|
||||
// NewCachedDiscoveryClient creates a new DiscoveryClient. cacheDirectory is the directory where discovery docs are held. It must be unique per host:port combination to work well.
|
||||
func NewCachedDiscoveryClient(delegate discovery.DiscoveryInterface, cacheDirectory string, ttl time.Duration) *CachedDiscoveryClient {
|
||||
return &CachedDiscoveryClient{
|
||||
delegate: delegate,
|
||||
cacheDirectory: cacheDirectory,
|
||||
ttl: ttl,
|
||||
ourFiles: map[string]struct{}{},
|
||||
fresh: true,
|
||||
}
|
||||
}
|
||||
164
pkg/kubectl/cmd/util/cached_discovery_test.go
Normal file
164
pkg/kubectl/cmd/util/cached_discovery_test.go
Normal file
@ -0,0 +1,164 @@
|
||||
/*
|
||||
Copyright 2016 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 util
|
||||
|
||||
import (
|
||||
"io/ioutil"
|
||||
"os"
|
||||
"testing"
|
||||
"time"
|
||||
|
||||
"github.com/emicklei/go-restful/swagger"
|
||||
"github.com/stretchr/testify/assert"
|
||||
|
||||
"k8s.io/kubernetes/pkg/api/errors"
|
||||
"k8s.io/kubernetes/pkg/api/unversioned"
|
||||
"k8s.io/kubernetes/pkg/client/restclient"
|
||||
"k8s.io/kubernetes/pkg/client/restclient/fake"
|
||||
"k8s.io/kubernetes/pkg/client/typed/discovery"
|
||||
"k8s.io/kubernetes/pkg/version"
|
||||
)
|
||||
|
||||
func TestCachedDiscoveryClient_Fresh(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
d, err := ioutil.TempDir("", "")
|
||||
assert.NoError(err)
|
||||
defer os.RemoveAll(d)
|
||||
|
||||
c := fakeDiscoveryClient{}
|
||||
cdc := NewCachedDiscoveryClient(&c, d, 60*time.Second)
|
||||
assert.True(cdc.Fresh(), "should be fresh after creation")
|
||||
|
||||
cdc.ServerGroups()
|
||||
assert.True(cdc.Fresh(), "should be fresh after groups call without cache")
|
||||
assert.Equal(c.groupCalls, 1)
|
||||
|
||||
cdc.ServerGroups()
|
||||
assert.True(cdc.Fresh(), "should be fresh after another groups call")
|
||||
assert.Equal(c.groupCalls, 1)
|
||||
|
||||
cdc.ServerResources()
|
||||
assert.True(cdc.Fresh(), "should be fresh after resources call")
|
||||
assert.Equal(c.resourceCalls, 1)
|
||||
|
||||
cdc.ServerResources()
|
||||
assert.True(cdc.Fresh(), "should be fresh after another resources call")
|
||||
assert.Equal(c.resourceCalls, 1)
|
||||
|
||||
cdc = NewCachedDiscoveryClient(&c, d, 60*time.Second)
|
||||
cdc.ServerGroups()
|
||||
assert.False(cdc.Fresh(), "should NOT be fresh after recreation with existing groups cache")
|
||||
assert.Equal(c.groupCalls, 1)
|
||||
|
||||
cdc.ServerResources()
|
||||
assert.False(cdc.Fresh(), "should NOT be fresh after recreation with existing resources cache")
|
||||
assert.Equal(c.resourceCalls, 1)
|
||||
|
||||
cdc.Invalidate()
|
||||
assert.True(cdc.Fresh(), "should be fresh after cache invalidation")
|
||||
|
||||
cdc.ServerResources()
|
||||
assert.True(cdc.Fresh(), "should ignore existing resources cache after invalidation")
|
||||
assert.Equal(c.resourceCalls, 2)
|
||||
}
|
||||
|
||||
func TestNewCachedDiscoveryClient_TTL(t *testing.T) {
|
||||
assert := assert.New(t)
|
||||
|
||||
d, err := ioutil.TempDir("", "")
|
||||
assert.NoError(err)
|
||||
defer os.RemoveAll(d)
|
||||
|
||||
c := fakeDiscoveryClient{}
|
||||
cdc := NewCachedDiscoveryClient(&c, d, 1*time.Nanosecond)
|
||||
cdc.ServerGroups()
|
||||
assert.Equal(c.groupCalls, 1)
|
||||
|
||||
time.Sleep(1 * time.Second)
|
||||
|
||||
cdc.ServerGroups()
|
||||
assert.Equal(c.groupCalls, 2)
|
||||
}
|
||||
|
||||
type fakeDiscoveryClient struct {
|
||||
groupCalls int
|
||||
resourceCalls int
|
||||
versionCalls int
|
||||
swaggerCalls int
|
||||
}
|
||||
|
||||
var _ discovery.DiscoveryInterface = &fakeDiscoveryClient{}
|
||||
|
||||
func (c *fakeDiscoveryClient) RESTClient() restclient.Interface {
|
||||
return &fake.RESTClient{}
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerGroups() (*unversioned.APIGroupList, error) {
|
||||
c.groupCalls = c.groupCalls + 1
|
||||
return &unversioned.APIGroupList{
|
||||
Groups: []unversioned.APIGroup{
|
||||
{
|
||||
Name: "a",
|
||||
Versions: []unversioned.GroupVersionForDiscovery{
|
||||
{
|
||||
GroupVersion: "a/v1",
|
||||
Version: "v1",
|
||||
},
|
||||
},
|
||||
PreferredVersion: unversioned.GroupVersionForDiscovery{
|
||||
GroupVersion: "a/v1",
|
||||
Version: "v1",
|
||||
},
|
||||
},
|
||||
},
|
||||
}, nil
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerResourcesForGroupVersion(groupVersion string) (*unversioned.APIResourceList, error) {
|
||||
c.resourceCalls = c.resourceCalls + 1
|
||||
if groupVersion == "a/v1" {
|
||||
return &unversioned.APIResourceList{}, nil
|
||||
}
|
||||
|
||||
return nil, errors.NewNotFound(unversioned.GroupResource{}, "")
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerResources() (map[string]*unversioned.APIResourceList, error) {
|
||||
c.resourceCalls = c.resourceCalls + 1
|
||||
return map[string]*unversioned.APIResourceList{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerPreferredResources() ([]unversioned.GroupVersionResource, error) {
|
||||
c.resourceCalls = c.resourceCalls + 1
|
||||
return []unversioned.GroupVersionResource{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerPreferredNamespacedResources() ([]unversioned.GroupVersionResource, error) {
|
||||
c.resourceCalls = c.resourceCalls + 1
|
||||
return []unversioned.GroupVersionResource{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) ServerVersion() (*version.Info, error) {
|
||||
c.versionCalls = c.versionCalls + 1
|
||||
return &version.Info{}, nil
|
||||
}
|
||||
|
||||
func (c *fakeDiscoveryClient) SwaggerSchema(version unversioned.GroupVersion) (*swagger.ApiDeclaration, error) {
|
||||
c.swaggerCalls = c.swaggerCalls + 1
|
||||
return &swagger.ApiDeclaration{}, nil
|
||||
}
|
||||
@ -27,6 +27,7 @@ import (
|
||||
"os/user"
|
||||
"path"
|
||||
"path/filepath"
|
||||
"regexp"
|
||||
"sort"
|
||||
"strconv"
|
||||
"strings"
|
||||
@ -61,6 +62,7 @@ import (
|
||||
"k8s.io/kubernetes/pkg/runtime"
|
||||
"k8s.io/kubernetes/pkg/runtime/serializer/json"
|
||||
utilflag "k8s.io/kubernetes/pkg/util/flag"
|
||||
"k8s.io/kubernetes/pkg/util/homedir"
|
||||
"k8s.io/kubernetes/pkg/watch"
|
||||
)
|
||||
|
||||
@ -77,6 +79,8 @@ type Factory interface {
|
||||
// Returns internal flagset
|
||||
FlagSet() *pflag.FlagSet
|
||||
|
||||
// Returns a discovery client
|
||||
DiscoveryClient() (discovery.CachedDiscoveryInterface, error)
|
||||
// Returns interfaces for dealing with arbitrary runtime.Objects.
|
||||
Object() (meta.RESTMapper, runtime.ObjectTyper)
|
||||
// Returns interfaces for dealing with arbitrary
|
||||
@ -313,27 +317,36 @@ func NewFactory(optionalClientConfig clientcmd.ClientConfig) Factory {
|
||||
}
|
||||
|
||||
clients := NewClientCache(clientConfig)
|
||||
return &factory{
|
||||
|
||||
f := &factory{
|
||||
flags: flags,
|
||||
clientConfig: clientConfig,
|
||||
clients: clients,
|
||||
}
|
||||
|
||||
return f
|
||||
}
|
||||
|
||||
func (f *factory) FlagSet() *pflag.FlagSet {
|
||||
return f.flags
|
||||
}
|
||||
|
||||
func (f *factory) Object() (meta.RESTMapper, runtime.ObjectTyper) {
|
||||
func (f *factory) DiscoveryClient() (discovery.CachedDiscoveryInterface, error) {
|
||||
cfg, err := f.clientConfig.ClientConfig()
|
||||
checkErrWithPrefix("failed to get client config: ", err)
|
||||
cmdApiVersion := unversioned.GroupVersion{}
|
||||
if cfg.GroupVersion != nil {
|
||||
cmdApiVersion = *cfg.GroupVersion
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
|
||||
mapper := registered.RESTMapper()
|
||||
discoveryClient, err := discovery.NewDiscoveryClientForConfig(cfg)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
cacheDir := computeDiscoverCacheDir(filepath.Join(homedir.HomeDir(), ".kube", "cache", "discovery"), cfg.Host)
|
||||
return NewCachedDiscoveryClient(discoveryClient, cacheDir, time.Duration(10*time.Minute)), nil
|
||||
}
|
||||
|
||||
func (f *factory) Object() (meta.RESTMapper, runtime.ObjectTyper) {
|
||||
mapper := registered.RESTMapper()
|
||||
discoveryClient, err := f.DiscoveryClient()
|
||||
if err == nil {
|
||||
mapper = meta.FirstHitRESTMapper{
|
||||
MultiRESTMapper: meta.MultiRESTMapper{
|
||||
@ -345,23 +358,28 @@ func (f *factory) Object() (meta.RESTMapper, runtime.ObjectTyper) {
|
||||
|
||||
// wrap with shortcuts
|
||||
mapper = NewShortcutExpander(mapper, discoveryClient)
|
||||
|
||||
// wrap with output preferences
|
||||
cfg, err := f.clients.ClientConfigForVersion(nil)
|
||||
checkErrWithPrefix("failed to get client config: ", err)
|
||||
cmdApiVersion := unversioned.GroupVersion{}
|
||||
if cfg.GroupVersion != nil {
|
||||
cmdApiVersion = *cfg.GroupVersion
|
||||
}
|
||||
mapper = kubectl.OutputVersionMapper{RESTMapper: mapper, OutputVersions: []unversioned.GroupVersion{cmdApiVersion}}
|
||||
return mapper, api.Scheme
|
||||
}
|
||||
|
||||
func (f *factory) UnstructuredObject() (meta.RESTMapper, runtime.ObjectTyper, error) {
|
||||
cfg, err := f.clients.ClientConfigForVersion(nil)
|
||||
discoveryClient, err := f.DiscoveryClient()
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
|
||||
dc, err := discovery.NewDiscoveryClientForConfig(cfg)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
groupResources, err := discovery.GetAPIGroupResources(discoveryClient)
|
||||
if err != nil && !discoveryClient.Fresh() {
|
||||
discoveryClient.Invalidate()
|
||||
groupResources, err = discovery.GetAPIGroupResources(discoveryClient)
|
||||
}
|
||||
|
||||
groupResources, err := discovery.GetAPIGroupResources(dc)
|
||||
if err != nil {
|
||||
return nil, nil, err
|
||||
}
|
||||
@ -378,11 +396,9 @@ func (f *factory) UnstructuredObject() (meta.RESTMapper, runtime.ObjectTyper, er
|
||||
}
|
||||
}
|
||||
|
||||
mapper := discovery.NewRESTMapper(groupResources, meta.InterfacesForUnstructured)
|
||||
|
||||
mapper := discovery.NewDeferredDiscoveryRESTMapper(discoveryClient, meta.InterfacesForUnstructured)
|
||||
typer := discovery.NewUnstructuredObjectTyper(groupResources)
|
||||
|
||||
return NewShortcutExpander(mapper, dc), typer, nil
|
||||
return NewShortcutExpander(mapper, discoveryClient), typer, nil
|
||||
}
|
||||
|
||||
func (f *factory) RESTClient() (*restclient.RESTClient, error) {
|
||||
@ -1316,3 +1332,16 @@ func (f *factory) SuggestedPodTemplateResources() []unversioned.GroupResource {
|
||||
{Resource: "replicaset"},
|
||||
}
|
||||
}
|
||||
|
||||
// overlyCautiousIllegalFileCharacters matches characters that *might* not be supported. Windows is really restrictive, so this is really restrictive
|
||||
var overlyCautiousIllegalFileCharacters = regexp.MustCompile(`[^(\w/\.)]`)
|
||||
|
||||
// computeDiscoverCacheDir takes the parentDir and the host and comes up with a "usually non-colliding" name.
|
||||
func computeDiscoverCacheDir(parentDir, host string) string {
|
||||
// strip the optional scheme from host if its there:
|
||||
schemelessHost := strings.Replace(strings.Replace(host, "https://", "", 1), "http://", "", 1)
|
||||
// now do a simple collapse of non-AZ09 characters. Collisions are possible but unlikely. Even if we do collide the problem is short lived
|
||||
safeHost := overlyCautiousIllegalFileCharacters.ReplaceAllString(schemelessHost, "_")
|
||||
|
||||
return filepath.Join(parentDir, safeHost)
|
||||
}
|
||||
|
||||
@ -25,18 +25,18 @@ import (
|
||||
"k8s.io/kubernetes/pkg/kubectl"
|
||||
)
|
||||
|
||||
// ShortcutExpander is a RESTMapper that can be used for OpenShift resources. It expands the resource first, then invokes the wrapped
|
||||
// ShortcutExpander is a RESTMapper that can be used for Kubernetes resources. It expands the resource first, then invokes the wrapped
|
||||
type ShortcutExpander struct {
|
||||
RESTMapper meta.RESTMapper
|
||||
|
||||
All []unversioned.GroupResource
|
||||
|
||||
discoveryClient *discovery.DiscoveryClient
|
||||
discoveryClient discovery.DiscoveryInterface
|
||||
}
|
||||
|
||||
var _ meta.RESTMapper = &ShortcutExpander{}
|
||||
|
||||
func NewShortcutExpander(delegate meta.RESTMapper, client *discovery.DiscoveryClient) ShortcutExpander {
|
||||
func NewShortcutExpander(delegate meta.RESTMapper, client discovery.DiscoveryInterface) ShortcutExpander {
|
||||
return ShortcutExpander{All: userResources, RESTMapper: delegate, discoveryClient: client}
|
||||
}
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user