cleanup some dead kubectl code and narrow scope of helpers

pkg/kubectl/cmd/set/env/env_resolve.go

@@ -0,0 +1,133 @@
+/*
+Copyright 2017 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 env
+
+import (
+	"fmt"
+
+	"k8s.io/api/core/v1"
+	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
+	"k8s.io/apimachinery/pkg/runtime"
+	"k8s.io/client-go/kubernetes"
+	"k8s.io/kubernetes/pkg/api/v1/resource"
+	"k8s.io/kubernetes/pkg/fieldpath"
+)
+
+// ResourceStore defines a new resource store data structure.
+type ResourceStore struct {
+	SecretStore    map[string]*v1.Secret
+	ConfigMapStore map[string]*v1.ConfigMap
+}
+
+// NewResourceStore returns a pointer to a new resource store data structure.
+func NewResourceStore() *ResourceStore {
+	return &ResourceStore{
+		SecretStore:    make(map[string]*v1.Secret),
+		ConfigMapStore: make(map[string]*v1.ConfigMap),
+	}
+}
+
+// getSecretRefValue returns the value of a secret in the supplied namespace
+func getSecretRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, secretSelector *v1.SecretKeySelector) (string, error) {
+	secret, ok := store.SecretStore[secretSelector.Name]
+	if !ok {
+		var err error
+		secret, err = client.CoreV1().Secrets(namespace).Get(secretSelector.Name, metav1.GetOptions{})
+		if err != nil {
+			return "", err
+		}
+		store.SecretStore[secretSelector.Name] = secret
+	}
+	if data, ok := secret.Data[secretSelector.Key]; ok {
+		return string(data), nil
+	}
+	return "", fmt.Errorf("key %s not found in secret %s", secretSelector.Key, secretSelector.Name)
+
+}
+
+// getConfigMapRefValue returns the value of a configmap in the supplied namespace
+func getConfigMapRefValue(client kubernetes.Interface, namespace string, store *ResourceStore, configMapSelector *v1.ConfigMapKeySelector) (string, error) {
+	configMap, ok := store.ConfigMapStore[configMapSelector.Name]
+	if !ok {
+		var err error
+		configMap, err = client.CoreV1().ConfigMaps(namespace).Get(configMapSelector.Name, metav1.GetOptions{})
+		if err != nil {
+			return "", err
+		}
+		store.ConfigMapStore[configMapSelector.Name] = configMap
+	}
+	if data, ok := configMap.Data[configMapSelector.Key]; ok {
+		return string(data), nil
+	}
+	return "", fmt.Errorf("key %s not found in config map %s", configMapSelector.Key, configMapSelector.Name)
+}
+
+// getFieldRef returns the value of the supplied path in the given object
+func getFieldRef(obj runtime.Object, from *v1.EnvVarSource) (string, error) {
+	return fieldpath.ExtractFieldPathAsString(obj, from.FieldRef.FieldPath)
+}
+
+// getResourceFieldRef returns the value of a resource in the given container
+func getResourceFieldRef(from *v1.EnvVarSource, c *v1.Container) (string, error) {
+	return resource.ExtractContainerResourceValue(from.ResourceFieldRef, c)
+}
+
+// GetEnvVarRefValue returns the value referenced by the supplied EnvVarSource given the other supplied information.
+func GetEnvVarRefValue(kc kubernetes.Interface, ns string, store *ResourceStore, from *v1.EnvVarSource, obj runtime.Object, c *v1.Container) (string, error) {
+	if from.SecretKeyRef != nil {
+		return getSecretRefValue(kc, ns, store, from.SecretKeyRef)
+	}
+
+	if from.ConfigMapKeyRef != nil {
+		return getConfigMapRefValue(kc, ns, store, from.ConfigMapKeyRef)
+	}
+
+	if from.FieldRef != nil {
+		return getFieldRef(obj, from)
+	}
+
+	if from.ResourceFieldRef != nil {
+		return getResourceFieldRef(from, c)
+	}
+
+	return "", fmt.Errorf("invalid valueFrom")
+}
+
+// GetEnvVarRefString returns a text description of whichever field is set within the supplied EnvVarSource argument.
+func GetEnvVarRefString(from *v1.EnvVarSource) string {
+	if from.ConfigMapKeyRef != nil {
+		return fmt.Sprintf("configmap %s, key %s", from.ConfigMapKeyRef.Name, from.ConfigMapKeyRef.Key)
+	}
+
+	if from.SecretKeyRef != nil {
+		return fmt.Sprintf("secret %s, key %s", from.SecretKeyRef.Name, from.SecretKeyRef.Key)
+	}
+
+	if from.FieldRef != nil {
+		return fmt.Sprintf("field path %s", from.FieldRef.FieldPath)
+	}
+
+	if from.ResourceFieldRef != nil {
+		containerPrefix := ""
+		if from.ResourceFieldRef.ContainerName != "" {
+			containerPrefix = fmt.Sprintf("%s/", from.ResourceFieldRef.ContainerName)
+		}
+		return fmt.Sprintf("resource field %s%s", containerPrefix, from.ResourceFieldRef.Resource)
+	}
+
+	return "invalid valueFrom"
+}