Initial commit

Signed-off-by: Andy Goldstein <andy.goldstein@gmail.com>

pkg/client/client.go

@@ -0,0 +1,31 @@
+/*
+Copyright 2017 Heptio Inc.
+
+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 client
+
+import (
+	"k8s.io/client-go/rest"
+	"k8s.io/client-go/tools/clientcmd"
+)
+
+// Config returns a *rest.Config, using either the kubeconfig (if specified) or an in-cluster
+// configuration.
+func Config(kubeconfig string) (*rest.Config, error) {
+	if len(kubeconfig) > 0 {
+		return clientcmd.BuildConfigFromFlags("", kubeconfig)
+	}
+	return rest.InClusterConfig()
+}

pkg/client/dynamic.go

@@ -0,0 +1,100 @@
+/*
+Copyright 2017 Heptio Inc.
+
+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 client
+
+import (
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/apis/meta/v1/unstructured"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/apimachinery/pkg/runtime/schema"
+	"k8s.io/apimachinery/pkg/watch"
+	"k8s.io/client-go/dynamic"
+)
+
+// DynamicFactory contains methods for retrieving dynamic clients for GroupVersionResources and
+// GroupVersionKinds.
+type DynamicFactory interface {
+	// ClientForGroupVersionResource returns a Dynamic client for the given Group and Version
+	// (specified in gvr) and Resource (specified in resource) for the given namespace.
+	ClientForGroupVersionResource(gvr schema.GroupVersionResource, resource metav1.APIResource, namespace string) (Dynamic, error)
+	// ClientForGroupVersionKind returns a Dynamic client for the given Group and Version
+	// (specified in gvk) and Resource (specified in resource) for the given namespace.
+	ClientForGroupVersionKind(gvk schema.GroupVersionKind, resource metav1.APIResource, namespace string) (Dynamic, error)
+}
+
+// dynamicFactory implements DynamicFactory.
+type dynamicFactory struct {
+	clientPool dynamic.ClientPool
+}
+
+var _ DynamicFactory = &dynamicFactory{}
+
+// NewDynamicFactory returns a new ClientPool-based dynamic factory.
+func NewDynamicFactory(clientPool dynamic.ClientPool) DynamicFactory {
+	return &dynamicFactory{clientPool: clientPool}
+}
+
+func (f *dynamicFactory) ClientForGroupVersionResource(gvr schema.GroupVersionResource, resource metav1.APIResource, namespace string) (Dynamic, error) {
+	dynamicClient, err := f.clientPool.ClientForGroupVersionResource(gvr)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dynamicResourceClient{
+		resourceClient: dynamicClient.Resource(&resource, namespace),
+	}, nil
+}
+
+func (f *dynamicFactory) ClientForGroupVersionKind(gvk schema.GroupVersionKind, resource metav1.APIResource, namespace string) (Dynamic, error) {
+	dynamicClient, err := f.clientPool.ClientForGroupVersionKind(gvk)
+	if err != nil {
+		return nil, err
+	}
+
+	return &dynamicResourceClient{
+		resourceClient: dynamicClient.Resource(&resource, namespace),
+	}, nil
+}
+
+// Dynamic contains client methods that Ark needs for backing up and restoring resources.
+type Dynamic interface {
+	// Create creates an object.
+	Create(obj *unstructured.Unstructured) (*unstructured.Unstructured, error)
+	// List lists all the objects of a given resource.
+	List(metav1.ListOptions) (runtime.Object, error)
+	// Watch watches for changes to objects of a given resource.
+	Watch(metav1.ListOptions) (watch.Interface, error)
+}
+
+// dynamicResourceClient implements Dynamic.
+type dynamicResourceClient struct {
+	resourceClient *dynamic.ResourceClient
+}
+
+var _ Dynamic = &dynamicResourceClient{}
+
+func (d *dynamicResourceClient) Create(obj *unstructured.Unstructured) (*unstructured.Unstructured, error) {
+	return d.resourceClient.Create(obj)
+}
+
+func (d *dynamicResourceClient) List(options metav1.ListOptions) (runtime.Object, error) {
+	return d.resourceClient.List(options)
+}
+
+func (d *dynamicResourceClient) Watch(options metav1.ListOptions) (watch.Interface, error) {
+	return d.resourceClient.Watch(options)
+}

pkg/client/factory.go

@@ -0,0 +1,72 @@
+/*
+Copyright 2017 Heptio Inc.
+
+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 client
+
+import (
+	"os"
+
+	"github.com/spf13/pflag"
+
+	"github.com/heptio/ark/pkg/generated/clientset"
+)
+
+// Factory knows how to create an ArkClient.
+type Factory interface {
+	// BindFlags binds common flags such as --kubeconfig to the passed-in FlagSet.
+	BindFlags(flags *pflag.FlagSet)
+	// Client returns an ArkClient. It uses the following priority to specify the cluster
+	// configuration:  --kubeconfig flag, KUBECONFIG environment variable, in-cluster configuration.
+	Client() (clientset.Interface, error)
+}
+
+type factory struct {
+	flags      *pflag.FlagSet
+	kubeconfig string
+}
+
+// NewFactory returns a Factory.
+func NewFactory() Factory {
+	f := &factory{
+		flags: pflag.NewFlagSet("", pflag.ContinueOnError),
+	}
+	f.flags.StringVar(&f.kubeconfig, "kubeconfig", "", "Path to the kubeconfig file to use to talk to the Kubernetes apiserver. If unset, try the environment variable KUBECONFIG, as well as in-cluster configuration")
+
+	return f
+}
+
+func (f *factory) BindFlags(flags *pflag.FlagSet) {
+	flags.AddFlagSet(f.flags)
+}
+
+func (f *factory) Client() (clientset.Interface, error) {
+	kubeconfig := f.kubeconfig
+	if kubeconfig == "" {
+		// if the command line flag was not specified, try the environment variable
+		kubeconfig = os.Getenv("KUBECONFIG")
+	}
+
+	clientConfig, err := Config(kubeconfig)
+	if err != nil {
+		return nil, err
+	}
+
+	arkClient, err := clientset.NewForConfig(clientConfig)
+	if err != nil {
+		return nil, err
+	}
+	return arkClient, nil
+}