dd9de90b0a
note that we don't change the behaviour of kubectl. For example it won't scale new resources. That's the end goal. The first step is to retrofit existing code to use the generic scaler.
450 lines
14 KiB
Go
450 lines
14 KiB
Go
/*
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Copyright 2016 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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// this file contains factories with no other dependencies
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package util
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import (
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"errors"
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"fmt"
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"os"
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"reflect"
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"sort"
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"sync"
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"time"
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"github.com/golang/glog"
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"k8s.io/api/core/v1"
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"k8s.io/apimachinery/pkg/api/meta"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/runtime"
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"k8s.io/client-go/discovery"
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"k8s.io/client-go/dynamic"
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restclient "k8s.io/client-go/rest"
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scaleclient "k8s.io/client-go/scale"
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"k8s.io/kubernetes/pkg/api/legacyscheme"
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"k8s.io/kubernetes/pkg/apis/apps"
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"k8s.io/kubernetes/pkg/apis/batch"
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api "k8s.io/kubernetes/pkg/apis/core"
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"k8s.io/kubernetes/pkg/apis/extensions"
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client "k8s.io/kubernetes/pkg/client/unversioned"
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"k8s.io/kubernetes/pkg/controller"
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"k8s.io/kubernetes/pkg/kubectl"
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"k8s.io/kubernetes/pkg/kubectl/categories"
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"k8s.io/kubernetes/pkg/kubectl/cmd/util/openapi"
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openapivalidation "k8s.io/kubernetes/pkg/kubectl/cmd/util/openapi/validation"
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"k8s.io/kubernetes/pkg/kubectl/resource"
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"k8s.io/kubernetes/pkg/kubectl/validation"
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"k8s.io/kubernetes/pkg/printers"
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printersinternal "k8s.io/kubernetes/pkg/printers/internalversion"
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)
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type ring1Factory struct {
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clientAccessFactory ClientAccessFactory
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// openAPIGetter loads and caches openapi specs
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openAPIGetter openAPIGetter
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}
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type openAPIGetter struct {
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once sync.Once
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getter openapi.Getter
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}
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func NewObjectMappingFactory(clientAccessFactory ClientAccessFactory) ObjectMappingFactory {
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f := &ring1Factory{
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clientAccessFactory: clientAccessFactory,
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}
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return f
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}
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// objectLoader attempts to perform discovery against the server, and will fall back to
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// the built in mapper if necessary. It supports unstructured objects either way, since
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// the underlying Scheme supports Unstructured. The mapper will return converters that can
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// convert versioned types to unstructured and back.
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func (f *ring1Factory) objectLoader() (meta.RESTMapper, runtime.ObjectTyper, error) {
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discoveryClient, err := f.clientAccessFactory.DiscoveryClient()
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if err != nil {
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glog.V(3).Infof("Unable to get a discovery client to find server resources, falling back to hardcoded types: %v", err)
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return legacyscheme.Registry.RESTMapper(), legacyscheme.Scheme, nil
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}
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groupResources, err := discovery.GetAPIGroupResources(discoveryClient)
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if err != nil && !discoveryClient.Fresh() {
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discoveryClient.Invalidate()
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groupResources, err = discovery.GetAPIGroupResources(discoveryClient)
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}
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if err != nil {
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glog.V(3).Infof("Unable to retrieve API resources, falling back to hardcoded types: %v", err)
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return legacyscheme.Registry.RESTMapper(), legacyscheme.Scheme, nil
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}
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// allow conversion between typed and unstructured objects
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interfaces := meta.InterfacesForUnstructuredConversion(legacyscheme.Registry.InterfacesFor)
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mapper := discovery.NewDeferredDiscoveryRESTMapper(discoveryClient, meta.VersionInterfacesFunc(interfaces))
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// TODO: should this also indicate it recognizes typed objects?
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typer := discovery.NewUnstructuredObjectTyper(groupResources, legacyscheme.Scheme)
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expander := NewShortcutExpander(mapper, discoveryClient)
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return expander, typer, err
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}
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func (f *ring1Factory) Object() (meta.RESTMapper, runtime.ObjectTyper) {
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return meta.NewLazyObjectLoader(f.objectLoader)
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}
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func (f *ring1Factory) CategoryExpander() categories.CategoryExpander {
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legacyExpander := categories.LegacyCategoryExpander
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discoveryClient, err := f.clientAccessFactory.DiscoveryClient()
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if err == nil {
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// fallback is the legacy expander wrapped with discovery based filtering
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fallbackExpander, err := categories.NewDiscoveryFilteredExpander(legacyExpander, discoveryClient)
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CheckErr(err)
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// by default use the expander that discovers based on "categories" field from the API
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discoveryCategoryExpander, err := categories.NewDiscoveryCategoryExpander(fallbackExpander, discoveryClient)
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CheckErr(err)
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return discoveryCategoryExpander
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}
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return legacyExpander
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}
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func (f *ring1Factory) ClientForMapping(mapping *meta.RESTMapping) (resource.RESTClient, error) {
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cfg, err := f.clientAccessFactory.ClientConfig()
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if err != nil {
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return nil, err
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}
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if err := client.SetKubernetesDefaults(cfg); err != nil {
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return nil, err
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}
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gvk := mapping.GroupVersionKind
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switch gvk.Group {
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case api.GroupName:
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cfg.APIPath = "/api"
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default:
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cfg.APIPath = "/apis"
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}
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gv := gvk.GroupVersion()
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cfg.GroupVersion = &gv
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return restclient.RESTClientFor(cfg)
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}
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func (f *ring1Factory) UnstructuredClientForMapping(mapping *meta.RESTMapping) (resource.RESTClient, error) {
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cfg, err := f.clientAccessFactory.BareClientConfig()
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if err != nil {
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return nil, err
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}
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if err := restclient.SetKubernetesDefaults(cfg); err != nil {
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return nil, err
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}
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cfg.APIPath = "/apis"
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if mapping.GroupVersionKind.Group == api.GroupName {
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cfg.APIPath = "/api"
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}
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gv := mapping.GroupVersionKind.GroupVersion()
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cfg.ContentConfig = dynamic.ContentConfig()
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cfg.GroupVersion = &gv
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return restclient.RESTClientFor(cfg)
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}
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func (f *ring1Factory) Describer(mapping *meta.RESTMapping) (printers.Describer, error) {
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mappingVersion := mapping.GroupVersionKind.GroupVersion()
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clientset, err := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
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if err != nil {
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// if we can't make a client for this group/version, go generic if possible
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if genericDescriber, genericErr := genericDescriber(f.clientAccessFactory, mapping); genericErr == nil {
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return genericDescriber, nil
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}
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// otherwise return the original error
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return nil, err
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}
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// try to get a describer
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if describer, ok := printersinternal.DescriberFor(mapping.GroupVersionKind.GroupKind(), clientset); ok {
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return describer, nil
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}
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// if this is a kind we don't have a describer for yet, go generic if possible
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if genericDescriber, genericErr := genericDescriber(f.clientAccessFactory, mapping); genericErr == nil {
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return genericDescriber, nil
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}
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// otherwise return an unregistered error
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return nil, fmt.Errorf("no description has been implemented for %s", mapping.GroupVersionKind.String())
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}
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// helper function to make a generic describer, or return an error
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func genericDescriber(clientAccessFactory ClientAccessFactory, mapping *meta.RESTMapping) (printers.Describer, error) {
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clientConfig, err := clientAccessFactory.ClientConfig()
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if err != nil {
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return nil, err
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}
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clientConfigCopy := *clientConfig
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clientConfigCopy.APIPath = dynamic.LegacyAPIPathResolverFunc(mapping.GroupVersionKind)
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gv := mapping.GroupVersionKind.GroupVersion()
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clientConfigCopy.GroupVersion = &gv
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// used to fetch the resource
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dynamicClient, err := dynamic.NewClient(&clientConfigCopy)
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if err != nil {
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return nil, err
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}
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// used to get events for the resource
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clientSet, err := clientAccessFactory.ClientSet()
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if err != nil {
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return nil, err
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}
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eventsClient := clientSet.Core()
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return printersinternal.GenericDescriberFor(mapping, dynamicClient, eventsClient), nil
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}
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func (f *ring1Factory) LogsForObject(object, options runtime.Object, timeout time.Duration) (*restclient.Request, error) {
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clientset, err := f.clientAccessFactory.ClientSetForVersion(nil)
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if err != nil {
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return nil, err
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}
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opts, ok := options.(*api.PodLogOptions)
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if !ok {
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return nil, errors.New("provided options object is not a PodLogOptions")
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}
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var selector labels.Selector
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var namespace string
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switch t := object.(type) {
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case *api.Pod:
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return clientset.Core().Pods(t.Namespace).GetLogs(t.Name, opts), nil
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case *api.ReplicationController:
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namespace = t.Namespace
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selector = labels.SelectorFromSet(t.Spec.Selector)
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case *extensions.ReplicaSet:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *extensions.Deployment:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *batch.Job:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *apps.StatefulSet:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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default:
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return nil, fmt.Errorf("cannot get the logs from %T", object)
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}
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sortBy := func(pods []*v1.Pod) sort.Interface { return controller.ByLogging(pods) }
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pod, numPods, err := GetFirstPod(clientset.Core(), namespace, selector.String(), timeout, sortBy)
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if err != nil {
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return nil, err
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}
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if numPods > 1 {
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fmt.Fprintf(os.Stderr, "Found %v pods, using pod/%v\n", numPods, pod.Name)
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}
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return clientset.Core().Pods(pod.Namespace).GetLogs(pod.Name, opts), nil
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}
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func (f *ring1Factory) Scaler(mapping *meta.RESTMapping) (kubectl.Scaler, error) {
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mappingVersion := mapping.GroupVersionKind.GroupVersion()
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clientset, err := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
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if err != nil {
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return nil, err
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}
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// create scales getter
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// TODO(p0lyn0mial): put scalesGetter to a factory
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discoClient, err := f.clientAccessFactory.DiscoveryClient()
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if err != nil {
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return nil, err
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}
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restClient, err := f.clientAccessFactory.RESTClient()
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if err != nil {
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return nil, err
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}
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mapper, _ := f.Object()
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resolver := scaleclient.NewDiscoveryScaleKindResolver(discoClient)
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scalesGetter := scaleclient.New(restClient, mapper, dynamic.LegacyAPIPathResolverFunc, resolver)
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gvk := mapping.GroupVersionKind.GroupVersion().WithResource(mapping.Resource)
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return kubectl.ScalerFor(mapping.GroupVersionKind.GroupKind(), clientset, scalesGetter, gvk.GroupResource())
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}
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func (f *ring1Factory) Reaper(mapping *meta.RESTMapping) (kubectl.Reaper, error) {
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mappingVersion := mapping.GroupVersionKind.GroupVersion()
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clientset, clientsetErr := f.clientAccessFactory.ClientSetForVersion(&mappingVersion)
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reaper, reaperErr := kubectl.ReaperFor(mapping.GroupVersionKind.GroupKind(), clientset)
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if kubectl.IsNoSuchReaperError(reaperErr) {
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return nil, reaperErr
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}
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if clientsetErr != nil {
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return nil, clientsetErr
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}
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return reaper, reaperErr
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}
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func (f *ring1Factory) HistoryViewer(mapping *meta.RESTMapping) (kubectl.HistoryViewer, error) {
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external, err := f.clientAccessFactory.KubernetesClientSet()
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if err != nil {
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return nil, err
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}
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return kubectl.HistoryViewerFor(mapping.GroupVersionKind.GroupKind(), external)
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}
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func (f *ring1Factory) Rollbacker(mapping *meta.RESTMapping) (kubectl.Rollbacker, error) {
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external, err := f.clientAccessFactory.KubernetesClientSet()
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if err != nil {
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return nil, err
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}
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return kubectl.RollbackerFor(mapping.GroupVersionKind.GroupKind(), external)
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}
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func (f *ring1Factory) StatusViewer(mapping *meta.RESTMapping) (kubectl.StatusViewer, error) {
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clientset, err := f.clientAccessFactory.KubernetesClientSet()
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if err != nil {
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return nil, err
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}
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return kubectl.StatusViewerFor(mapping.GroupVersionKind.GroupKind(), clientset)
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}
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func (f *ring1Factory) ApproximatePodTemplateForObject(object runtime.Object) (*api.PodTemplateSpec, error) {
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switch t := object.(type) {
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case *api.Pod:
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return &api.PodTemplateSpec{
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ObjectMeta: t.ObjectMeta,
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Spec: t.Spec,
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}, nil
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case *api.ReplicationController:
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return t.Spec.Template, nil
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case *extensions.ReplicaSet:
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return &t.Spec.Template, nil
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case *extensions.DaemonSet:
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return &t.Spec.Template, nil
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case *extensions.Deployment:
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return &t.Spec.Template, nil
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case *batch.Job:
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return &t.Spec.Template, nil
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}
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return nil, fmt.Errorf("unable to extract pod template from type %v", reflect.TypeOf(object))
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}
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func (f *ring1Factory) AttachablePodForObject(object runtime.Object, timeout time.Duration) (*api.Pod, error) {
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clientset, err := f.clientAccessFactory.ClientSetForVersion(nil)
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if err != nil {
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return nil, err
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}
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var selector labels.Selector
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var namespace string
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switch t := object.(type) {
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case *extensions.ReplicaSet:
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namespace = t.Namespace
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selector = labels.SelectorFromSet(t.Spec.Selector.MatchLabels)
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case *api.ReplicationController:
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namespace = t.Namespace
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selector = labels.SelectorFromSet(t.Spec.Selector)
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case *apps.StatefulSet:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *extensions.Deployment:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *batch.Job:
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namespace = t.Namespace
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selector, err = metav1.LabelSelectorAsSelector(t.Spec.Selector)
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if err != nil {
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return nil, fmt.Errorf("invalid label selector: %v", err)
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}
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case *api.Pod:
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return t, nil
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default:
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return nil, fmt.Errorf("cannot attach to %T: not implemented", object)
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}
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sortBy := func(pods []*v1.Pod) sort.Interface { return sort.Reverse(controller.ActivePods(pods)) }
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pod, _, err := GetFirstPod(clientset.Core(), namespace, selector.String(), timeout, sortBy)
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return pod, err
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}
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func (f *ring1Factory) Validator(validate bool) (validation.Schema, error) {
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if !validate {
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return validation.NullSchema{}, nil
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}
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resources, err := f.OpenAPISchema()
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if err != nil {
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return nil, err
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}
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return validation.ConjunctiveSchema{
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openapivalidation.NewSchemaValidation(resources),
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validation.NoDoubleKeySchema{},
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}, nil
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}
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// OpenAPISchema returns metadata and structural information about Kubernetes object definitions.
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func (f *ring1Factory) OpenAPISchema() (openapi.Resources, error) {
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discovery, err := f.clientAccessFactory.DiscoveryClient()
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if err != nil {
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return nil, err
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}
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// Lazily initialize the OpenAPIGetter once
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f.openAPIGetter.once.Do(func() {
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// Create the caching OpenAPIGetter
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f.openAPIGetter.getter = openapi.NewOpenAPIGetter(discovery)
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})
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// Delegate to the OpenAPIGetter
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return f.openAPIGetter.getter.Get()
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}
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