k8s.io/apiserver@v0.31.1/pkg/server/options/coreapi.go (about) 1 /* 2 Copyright 2017 The Kubernetes Authors. 3 4 Licensed under the Apache License, Version 2.0 (the "License"); 5 you may not use this file except in compliance with the License. 6 You may obtain a copy of the License at 7 8 http://www.apache.org/licenses/LICENSE-2.0 9 10 Unless required by applicable law or agreed to in writing, software 11 distributed under the License is distributed on an "AS IS" BASIS, 12 WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 See the License for the specific language governing permissions and 14 limitations under the License. 15 */ 16 17 package options 18 19 import ( 20 "fmt" 21 "time" 22 23 "github.com/spf13/pflag" 24 "k8s.io/apiserver/pkg/features" 25 "k8s.io/apiserver/pkg/server" 26 "k8s.io/apiserver/pkg/util/feature" 27 clientgoinformers "k8s.io/client-go/informers" 28 clientgoclientset "k8s.io/client-go/kubernetes" 29 "k8s.io/client-go/rest" 30 "k8s.io/client-go/tools/clientcmd" 31 tracing "k8s.io/component-base/tracing" 32 ) 33 34 // CoreAPIOptions contains options to configure the connection to a core API Kubernetes apiserver. 35 type CoreAPIOptions struct { 36 // CoreAPIKubeconfigPath is a filename for a kubeconfig file to contact the core API server with. 37 // If it is not set, the in cluster config is used. 38 CoreAPIKubeconfigPath string 39 } 40 41 func NewCoreAPIOptions() *CoreAPIOptions { 42 return &CoreAPIOptions{} 43 } 44 45 func (o *CoreAPIOptions) AddFlags(fs *pflag.FlagSet) { 46 if o == nil { 47 return 48 } 49 50 fs.StringVar(&o.CoreAPIKubeconfigPath, "kubeconfig", o.CoreAPIKubeconfigPath, 51 "kubeconfig file pointing at the 'core' kubernetes server.") 52 } 53 54 func (o *CoreAPIOptions) ApplyTo(config *server.RecommendedConfig) error { 55 if o == nil { 56 return nil 57 } 58 59 // create shared informer for Kubernetes APIs 60 var kubeconfig *rest.Config 61 var err error 62 if len(o.CoreAPIKubeconfigPath) > 0 { 63 loadingRules := &clientcmd.ClientConfigLoadingRules{ExplicitPath: o.CoreAPIKubeconfigPath} 64 loader := clientcmd.NewNonInteractiveDeferredLoadingClientConfig(loadingRules, &clientcmd.ConfigOverrides{}) 65 kubeconfig, err = loader.ClientConfig() 66 if err != nil { 67 return fmt.Errorf("failed to load kubeconfig at %q: %v", o.CoreAPIKubeconfigPath, err) 68 } 69 } else { 70 kubeconfig, err = rest.InClusterConfig() 71 if err != nil { 72 return err 73 } 74 } 75 if feature.DefaultFeatureGate.Enabled(features.APIServerTracing) { 76 kubeconfig.Wrap(tracing.WrapperFor(config.TracerProvider)) 77 } 78 clientgoExternalClient, err := clientgoclientset.NewForConfig(kubeconfig) 79 if err != nil { 80 return fmt.Errorf("failed to create Kubernetes clientset: %v", err) 81 } 82 config.ClientConfig = kubeconfig 83 config.SharedInformerFactory = clientgoinformers.NewSharedInformerFactory(clientgoExternalClient, 10*time.Minute) 84 85 return nil 86 } 87 88 func (o *CoreAPIOptions) Validate() []error { 89 return nil 90 }