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use service accounts as clients for controllers
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| @@ -0,0 +1,156 @@ | ||
| /* | ||
| 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 app implements a server that runs a set of active | ||
| // components. This includes replication controllers, service endpoints and | ||
| // nodes. | ||
| // | ||
| // CAUTION: If you update code in this file, you may need to also update code | ||
| // in contrib/mesos/pkg/controllermanager/controllermanager.go | ||
| package app | ||
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||
| import ( | ||
| "fmt" | ||
| "time" | ||
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| "k8s.io/kubernetes/pkg/api" | ||
| apierrors "k8s.io/kubernetes/pkg/api/errors" | ||
| clientset "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset" | ||
| unversionedcore "k8s.io/kubernetes/pkg/client/clientset_generated/internalclientset/typed/core/unversioned" | ||
| "k8s.io/kubernetes/pkg/client/restclient" | ||
| "k8s.io/kubernetes/pkg/fields" | ||
| "k8s.io/kubernetes/pkg/watch" | ||
|
|
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| "github.com/golang/glog" | ||
| ) | ||
|
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| // ControllerClientBuilder allow syou to get clients and configs for controllers | ||
| type ControllerClientBuilder interface { | ||
| Config(name string) (*restclient.Config, error) | ||
| Client(name string) (clientset.Interface, error) | ||
| ClientOrDie(name string) clientset.Interface | ||
| } | ||
|
|
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| // SimpleControllerClientBuilder returns a fixed client with different user agents | ||
| type SimpleControllerClientBuilder struct { | ||
| // ClientConfig is a skeleton config to clone and use as the basis for each controller client | ||
| ClientConfig *restclient.Config | ||
| } | ||
|
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| func (b SimpleControllerClientBuilder) Config(name string) (*restclient.Config, error) { | ||
| clientConfig := *b.ClientConfig | ||
| return &clientConfig, nil | ||
| } | ||
|
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| func (b SimpleControllerClientBuilder) Client(name string) (clientset.Interface, error) { | ||
| clientConfig, err := b.Config(name) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return clientset.NewForConfig(restclient.AddUserAgent(clientConfig, name)) | ||
| } | ||
|
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| func (b SimpleControllerClientBuilder) ClientOrDie(name string) clientset.Interface { | ||
| client, err := b.Client(name) | ||
| if err != nil { | ||
| glog.Fatal(err) | ||
| } | ||
| return client | ||
| } | ||
|
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| // SAControllerClientBuilder is a ControllerClientBuilder that returns clients identifying as | ||
| // service accounts | ||
| type SAControllerClientBuilder struct { | ||
| // ClientConfig is a skeleton config to clone and use as the basis for each controller client | ||
| ClientConfig *restclient.Config | ||
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| // CoreClient is used to provision service accounts if needed and watch for their associated tokens | ||
| // to construct a controller client | ||
| CoreClient unversionedcore.CoreInterface | ||
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| // Namespace is the namespace used to host the service accounts that will back the | ||
| // controllers. It must be highly privileged namespace which normal users cannot inspect. | ||
| Namespace string | ||
| } | ||
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| // config returns a complete clientConfig for constructing clients. This is separate in anticipation of composition | ||
| // which means that not all clientsets are known here | ||
| func (b SAControllerClientBuilder) Config(name string) (*restclient.Config, error) { | ||
| clientConfig := *b.ClientConfig | ||
|
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| // we need the SA UID to find a matching SA token | ||
| sa, err := b.CoreClient.ServiceAccounts(b.Namespace).Get(name) | ||
| if err != nil && !apierrors.IsNotFound(err) { | ||
| return nil, err | ||
| } else if apierrors.IsNotFound(err) { | ||
| sa, err = b.CoreClient.ServiceAccounts(b.Namespace).Create( | ||
| &api.ServiceAccount{ObjectMeta: api.ObjectMeta{Namespace: b.Namespace, Name: name}}) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| } | ||
|
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||
| watcher, err := b.CoreClient.Secrets(b.Namespace).Watch( | ||
| api.ListOptions{ | ||
| ResourceVersion: "0", | ||
| FieldSelector: fields.SelectorFromSet(map[string]string{api.SecretTypeField: string(api.SecretTypeServiceAccountToken)}), | ||
| }) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| _, err = watch.Until(30*time.Second, watcher, | ||
| func(event watch.Event) (bool, error) { | ||
| switch event.Type { | ||
| case watch.Deleted: | ||
| return false, nil | ||
| case watch.Error: | ||
| return false, fmt.Errorf("error watching") | ||
| case watch.Added, watch.Modified: | ||
| secret := event.Object.(*api.Secret) | ||
| if secret.Annotations[api.ServiceAccountNameKey] != sa.Name || | ||
| secret.Annotations[api.ServiceAccountUIDKey] != string(sa.UID) || | ||
| len(secret.Data[api.ServiceAccountTokenKey]) == 0 { | ||
| return false, nil | ||
| } | ||
| clientConfig.BearerToken = string(secret.Data[api.ServiceAccountTokenKey]) | ||
| return true, nil | ||
|
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||
| default: | ||
| return false, fmt.Errorf("unexpected event type: %v", event.Type) | ||
| } | ||
| }) | ||
| if err != nil { | ||
| return nil, fmt.Errorf("unable to get token for service account: %v", err) | ||
| } | ||
|
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| return &clientConfig, nil | ||
| } | ||
|
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| func (b SAControllerClientBuilder) Client(name string) (clientset.Interface, error) { | ||
| clientConfig, err := b.Config(name) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return clientset.NewForConfig(clientConfig) | ||
| } | ||
|
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| func (b SAControllerClientBuilder) ClientOrDie(name string) clientset.Interface { | ||
| client, err := b.Client(name) | ||
| if err != nil { | ||
| glog.Fatal(err) | ||
| } | ||
| return client | ||
| } |
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