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factory_object_mapping.go
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factory_object_mapping.go
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/*
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.
*/
// this file contains factories with no other dependencies
package util
import (
"errors"
"fmt"
"os"
"reflect"
"sort"
"sync"
"time"
"github.com/golang/glog"
"k8s.io/api/core/v1"
"k8s.io/apimachinery/pkg/api/meta"
metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
"k8s.io/apimachinery/pkg/labels"
"k8s.io/apimachinery/pkg/runtime"
"k8s.io/client-go/discovery"
"k8s.io/client-go/dynamic"
restclient "k8s.io/client-go/rest"
"k8s.io/kubernetes/pkg/api/legacyscheme"
"k8s.io/kubernetes/pkg/apis/apps"
"k8s.io/kubernetes/pkg/apis/batch"
api "k8s.io/kubernetes/pkg/apis/core"
"k8s.io/kubernetes/pkg/apis/extensions"
client "k8s.io/kubernetes/pkg/client/unversioned"
"k8s.io/kubernetes/pkg/controller"
"k8s.io/kubernetes/pkg/kubectl"
"k8s.io/kubernetes/pkg/kubectl/categories"
"k8s.io/kubernetes/pkg/kubectl/cmd/util/openapi"
openapivalidation "k8s.io/kubernetes/pkg/kubectl/cmd/util/openapi/validation"
"k8s.io/kubernetes/pkg/kubectl/resource"
"k8s.io/kubernetes/pkg/kubectl/validation"
"k8s.io/kubernetes/pkg/printers"
printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
)
type ring1Factory struct {
clientAccessFactory ClientAccessFactory
// openAPIGetter loads and caches openapi specs
openAPIGetter openAPIGetter
}
type openAPIGetter struct {
once sync.Once
getter openapi.Getter
}
func NewObjectMappingFactory(clientAccessFactory ClientAccessFactory) ObjectMappingFactory {
f := &ring1Factory{
clientAccessFactory: clientAccessFactory,
}
return f
}
// objectLoader attempts to perform discovery against the server, and will fall back to
// the built in mapper if necessary. It supports unstructured objects either way, since
// the underlying Scheme supports Unstructured. The mapper will return converters that can
// convert versioned types to unstructured and back.
func (f *ring1Factory) objectLoader() (meta.RESTMapper, runtime.ObjectTyper, error) {
discoveryClient, err := f.clientAccessFactory.DiscoveryClient()
if err != nil {
glog.V(3).Infof("Unable to get a discovery client to find server resources, falling back to hardcoded types: %v", err)
return legacyscheme.Registry.RESTMapper(), legacyscheme.Scheme, nil
}
groupResources, err := discovery.GetAPIGroupResources(discoveryClient)
if err != nil && !discoveryClient.Fresh() {
discoveryClient.Invalidate()
groupResources, err = discovery.GetAPIGroupResources(discoveryClient)
}
if err != nil {
glog.V(3).Infof("Unable to retrieve API resources, falling back to hardcoded types: %v", err)
return legacyscheme.Registry.RESTMapper(), legacyscheme.Scheme, nil
}
// allow conversion between typed and unstructured objects
interfaces := meta.InterfacesForUnstructuredConversion(legacyscheme.Registry.InterfacesFor)
mapper := discovery.NewDeferredDiscoveryRESTMapper(discoveryClient, meta.VersionInterfacesFunc(interfaces))
// TODO: should this also indicate it recognizes typed objects?
typer := discovery.NewUnstructuredObjectTyper(groupResources, legacyscheme.Scheme)
expander := NewShortcutExpander(mapper, discoveryClient)
return expander, typer, err
}
func (f *ring1Factory) Object() (meta.RESTMapper, runtime.ObjectTyper) {
return meta.NewLazyObjectLoader(f.objectLoader)
}
func (f *ring1Factory) CategoryExpander() categories.CategoryExpander {
legacyExpander := categories.LegacyCategoryExpander
discoveryClient, err := f.clientAccessFactory.DiscoveryClient()
if err == nil {
// fallback is the legacy expander wrapped with discovery based filtering
fallbackExpander, err := categories.NewDiscoveryFilteredExpander(legacyExpander, discoveryClient)
CheckErr(err)
// by default use the expander that discovers based on "categories" field from the API
discoveryCategoryExpander, err := categories.NewDiscoveryCategoryExpander(fallbackExpander, discoveryClient)
CheckErr(err)
return discoveryCategoryExpander
}
return legacyExpander
}
func (f *ring1Factory) ClientForMapping(mapping *meta.RESTMapping) (resource.RESTClient, error) {
cfg, err := f.clientAccessFactory.ClientConfig()
if err != nil {
return nil, err
}
if err := client.SetKubernetesDefaults(cfg); err != nil {
return nil, err
}
gvk := mapping.GroupVersionKind
switch gvk.Group {
case api.GroupName:
cfg.APIPath = "/api"
default:
cfg.APIPath = "/apis"
}
gv := gvk.GroupVersion()
cfg.GroupVersion = &gv
return restclient.RESTClientFor(cfg)
}
func (f *ring1Factory) UnstructuredClientForMapping(mapping *meta.RESTMapping) (resource.RESTClient, error) {
cfg, err := f.clientAccessFactory.BareClientConfig()
if err != nil {
return nil, err
}
if err := restclient.SetKubernetesDefaults(cfg); err != nil {
return nil, err
}
cfg.APIPath = "/apis"
if mapping.GroupVersionKind.Group == api.GroupName {
cfg.APIPath = "/api"
}
gv := mapping.GroupVersionKind.GroupVersion()
cfg.ContentConfig = dynamic.ContentConfig()
cfg.GroupVersion = &gv
return restclient.RESTClientFor(cfg)
}
func (f *ring1Factory) Describer(mapping *meta.RESTMapping) (printers.Describer, error) {
mappingVersion := mapping.GroupVersionKind.GroupVersion()
clientset, err := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
if err != nil {
// if we can't make a client for this group/version, go generic if possible
if genericDescriber, genericErr := genericDescriber(f.clientAccessFactory, mapping); genericErr == nil {
return genericDescriber, nil
}
// otherwise return the original error
return nil, err
}
// try to get a describer
if describer, ok := printersinternal.DescriberFor(mapping.GroupVersionKind.GroupKind(), clientset); ok {
return describer, nil
}
// if this is a kind we don't have a describer for yet, go generic if possible
if genericDescriber, genericErr := genericDescriber(f.clientAccessFactory, mapping); genericErr == nil {
return genericDescriber, nil
}
// otherwise return an unregistered error
return nil, fmt.Errorf("no description has been implemented for %s", mapping.GroupVersionKind.String())
}
// helper function to make a generic describer, or return an error
func genericDescriber(clientAccessFactory ClientAccessFactory, mapping *meta.RESTMapping) (printers.Describer, error) {
clientConfig, err := clientAccessFactory.ClientConfig()
if err != nil {
return nil, err
}
clientConfigCopy := *clientConfig
clientConfigCopy.APIPath = dynamic.LegacyAPIPathResolverFunc(mapping.GroupVersionKind)
gv := mapping.GroupVersionKind.GroupVersion()
clientConfigCopy.GroupVersion = &gv
// used to fetch the resource
dynamicClient, err := dynamic.NewClient(&clientConfigCopy)
if err != nil {
return nil, err
}
// used to get events for the resource
clientSet, err := clientAccessFactory.ClientSet()
if err != nil {
return nil, err
}
eventsClient := clientSet.Core()
return printersinternal.GenericDescriberFor(mapping, dynamicClient, eventsClient), nil
}
func (f *ring1Factory) LogsForObject(object, options runtime.Object, timeout time.Duration) (*restclient.Request, error) {
clientset, err := f.clientAccessFactory.ClientSetForVersion(nil)
if err != nil {
return nil, err
}
opts, ok := options.(*api.PodLogOptions)
if !ok {
return nil, errors.New("provided options object is not a PodLogOptions")
}
var selector labels.Selector
var namespace string
switch t := object.(type) {
case *api.Pod:
return clientset.Core().Pods(t.Namespace).GetLogs(t.Name, opts), nil
case *api.ReplicationController:
namespace = t.Namespace
selector = labels.SelectorFromSet(t.Spec.Selector)
case *extensions.ReplicaSet:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *extensions.Deployment:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *batch.Job:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *apps.StatefulSet:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
default:
return nil, fmt.Errorf("cannot get the logs from %T", object)
}
sortBy := func(pods []*v1.Pod) sort.Interface { return controller.ByLogging(pods) }
pod, numPods, err := GetFirstPod(clientset.Core(), namespace, selector.String(), timeout, sortBy)
if err != nil {
return nil, err
}
if numPods > 1 {
fmt.Fprintf(os.Stderr, "Found %v pods, using pod/%v\n", numPods, pod.Name)
}
return clientset.Core().Pods(pod.Namespace).GetLogs(pod.Name, opts), nil
}
func (f *ring1Factory) Scaler(mapping *meta.RESTMapping) (kubectl.Scaler, error) {
mappingVersion := mapping.GroupVersionKind.GroupVersion()
clientset, err := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
if err != nil {
return nil, err
}
return kubectl.ScalerFor(mapping.GroupVersionKind.GroupKind(), clientset)
}
func (f *ring1Factory) Reaper(mapping *meta.RESTMapping) (kubectl.Reaper, error) {
mappingVersion := mapping.GroupVersionKind.GroupVersion()
clientset, clientsetErr := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
reaper, reaperErr := kubectl.ReaperFor(mapping.GroupVersionKind.GroupKind(), clientset)
if kubectl.IsNoSuchReaperError(reaperErr) {
return nil, reaperErr
}
if clientsetErr != nil {
return nil, clientsetErr
}
return reaper, reaperErr
}
func (f *ring1Factory) HistoryViewer(mapping *meta.RESTMapping) (kubectl.HistoryViewer, error) {
external, err := f.clientAccessFactory.KubernetesClientSet()
if err != nil {
return nil, err
}
return kubectl.HistoryViewerFor(mapping.GroupVersionKind.GroupKind(), external)
}
func (f *ring1Factory) Rollbacker(mapping *meta.RESTMapping) (kubectl.Rollbacker, error) {
external, err := f.clientAccessFactory.KubernetesClientSet()
if err != nil {
return nil, err
}
return kubectl.RollbackerFor(mapping.GroupVersionKind.GroupKind(), external)
}
func (f *ring1Factory) StatusViewer(mapping *meta.RESTMapping) (kubectl.StatusViewer, error) {
clientset, err := f.clientAccessFactory.KubernetesClientSet()
if err != nil {
return nil, err
}
return kubectl.StatusViewerFor(mapping.GroupVersionKind.GroupKind(), clientset)
}
func (f *ring1Factory) ApproximatePodTemplateForObject(object runtime.Object) (*api.PodTemplateSpec, error) {
switch t := object.(type) {
case *api.Pod:
return &api.PodTemplateSpec{
ObjectMeta: t.ObjectMeta,
Spec: t.Spec,
}, nil
case *api.ReplicationController:
return t.Spec.Template, nil
case *extensions.ReplicaSet:
return &t.Spec.Template, nil
case *extensions.DaemonSet:
return &t.Spec.Template, nil
case *extensions.Deployment:
return &t.Spec.Template, nil
case *batch.Job:
return &t.Spec.Template, nil
}
return nil, fmt.Errorf("unable to extract pod template from type %v", reflect.TypeOf(object))
}
func (f *ring1Factory) AttachablePodForObject(object runtime.Object, timeout time.Duration) (*api.Pod, error) {
clientset, err := f.clientAccessFactory.ClientSetForVersion(nil)
if err != nil {
return nil, err
}
var selector labels.Selector
var namespace string
switch t := object.(type) {
case *extensions.ReplicaSet:
namespace = t.Namespace
selector = labels.SelectorFromSet(t.Spec.Selector.MatchLabels)
case *api.ReplicationController:
namespace = t.Namespace
selector = labels.SelectorFromSet(t.Spec.Selector)
case *apps.StatefulSet:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *extensions.Deployment:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *batch.Job:
namespace = t.Namespace
selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
if err != nil {
return nil, fmt.Errorf("invalid label selector: %v", err)
}
case *api.Pod:
return t, nil
default:
return nil, fmt.Errorf("cannot attach to %T: not implemented", object)
}
sortBy := func(pods []*v1.Pod) sort.Interface { return sort.Reverse(controller.ActivePods(pods)) }
pod, _, err := GetFirstPod(clientset.Core(), namespace, selector.String(), timeout, sortBy)
return pod, err
}
func (f *ring1Factory) Validator(validate bool) (validation.Schema, error) {
if !validate {
return validation.NullSchema{}, nil
}
resources, err := f.OpenAPISchema()
if err != nil {
return nil, err
}
return validation.ConjunctiveSchema{
openapivalidation.NewSchemaValidation(resources),
validation.NoDoubleKeySchema{},
}, nil
}
// OpenAPISchema returns metadata and structural information about Kubernetes object definitions.
func (f *ring1Factory) OpenAPISchema() (openapi.Resources, error) {
discovery, err := f.clientAccessFactory.DiscoveryClient()
if err != nil {
return nil, err
}
// Lazily initialize the OpenAPIGetter once
f.openAPIGetter.once.Do(func() {
// Create the caching OpenAPIGetter
f.openAPIGetter.getter = openapi.NewOpenAPIGetter(discovery)
})
// Delegate to the OpenAPIGetter
return f.openAPIGetter.getter.Get()
}