[Federation][(Un)join-00] Implement federation/cluster resource generator.

pkg/kubectl/cluster.go

@@ -0,0 +1,125 @@
+/*
+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 kubectl
+
+import (
+	"fmt"
+
+	federationapi "k8s.io/kubernetes/federation/apis/federation/v1beta1"
+	"k8s.io/kubernetes/pkg/api/v1"
+	"k8s.io/kubernetes/pkg/runtime"
+)
+
+// ClusterGeneratorV1Beta1 supports stable generation of a
+// federation/cluster resource.
+type ClusterGeneratorV1Beta1 struct {
+	// Name of the cluster context (required)
+	Name string
+	// ClientCIDR is the CIDR range in which the Kubernetes APIServer
+	// is available for the client (optional)
+	ClientCIDR string
+	// ServerAddress is the APIServer address of the Kubernetes cluster
+	// that is being registered (required)
+	ServerAddress string
+	// SecretName is the name of the secret that stores the credentials
+	// for the Kubernetes cluster that is being registered (optional)
+	SecretName string
+}
+
+// Ensure it supports the generator pattern that uses parameter
+// injection.
+var _ Generator = &ClusterGeneratorV1Beta1{}
+
+// Ensure it supports the generator pattern that uses parameters
+// specified during construction.
+var _ StructuredGenerator = &ClusterGeneratorV1Beta1{}
+
+// Generate returns a cluster resource using the specified parameters.
+func (s ClusterGeneratorV1Beta1) Generate(genericParams map[string]interface{}) (runtime.Object, error) {
+	err := ValidateParams(s.ParamNames(), genericParams)
+	if err != nil {
+		return nil, err
+	}
+	clustergen := &ClusterGeneratorV1Beta1{}
+	params := map[string]string{}
+	for key, value := range genericParams {
+		strVal, isString := value.(string)
+		if !isString {
+			return nil, fmt.Errorf("expected string, saw %v for '%s'", value, key)
+		}
+		params[key] = strVal
+	}
+	clustergen.Name = params["name"]
+	clustergen.ClientCIDR = params["client-cidr"]
+	clustergen.ServerAddress = params["server-address"]
+	clustergen.SecretName = params["secret"]
+	return clustergen.StructuredGenerate()
+}
+
+// ParamNames returns the set of supported input parameters when using
+// the parameter injection generator pattern.
+func (s ClusterGeneratorV1Beta1) ParamNames() []GeneratorParam {
+	return []GeneratorParam{
+		{"name", true},
+		{"client-cidr", false},
+		{"server-address", true},
+		{"secret", false},
+	}
+}
+
+// StructuredGenerate outputs a federation cluster resource object
+// using the configured fields.
+func (s ClusterGeneratorV1Beta1) StructuredGenerate() (runtime.Object, error) {
+	if err := s.validate(); err != nil {
+		return nil, err
+	}
+	if s.ClientCIDR == "" {
+		s.ClientCIDR = "0.0.0.0/0"
+	}
+	if s.SecretName == "" {
+		s.SecretName = s.Name
+	}
+	cluster := &federationapi.Cluster{
+		ObjectMeta: v1.ObjectMeta{
+			Name: s.Name,
+		},
+		Spec: federationapi.ClusterSpec{
+			ServerAddressByClientCIDRs: []federationapi.ServerAddressByClientCIDR{
+				{
+					ClientCIDR:    s.ClientCIDR,
+					ServerAddress: s.ServerAddress,
+				},
+			},
+			SecretRef: &v1.LocalObjectReference{
+				Name: s.SecretName,
+			},
+		},
+	}
+	return cluster, nil
+}
+
+// validate validates required fields are set to support structured
+// generation.
+func (s ClusterGeneratorV1Beta1) validate() error {
+	if len(s.Name) == 0 {
+		return fmt.Errorf("name must be specified")
+	}
+	if len(s.ServerAddress) == 0 {
+		return fmt.Errorf("server address must be specified")
+	}
+	return nil
+}