Moving client libs to unversioned dir

pkg/client/unversioned/clientcmd/merged_client_builder.go

@@ -0,0 +1,104 @@
+/*
+Copyright 2014 The Kubernetes Authors All rights reserved.
+
+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 clientcmd
+
+import (
+	"io"
+	"reflect"
+
+	"github.com/golang/glog"
+
+	"k8s.io/kubernetes/pkg/client"
+	clientcmdapi "k8s.io/kubernetes/pkg/client/clientcmd/api"
+)
+
+// DeferredLoadingClientConfig is a ClientConfig interface that is backed by a set of loading rules
+// It is used in cases where the loading rules may change after you've instantiated them and you want to be sure that
+// the most recent rules are used.  This is useful in cases where you bind flags to loading rule parameters before
+// the parse happens and you want your calling code to be ignorant of how the values are being mutated to avoid
+// passing extraneous information down a call stack
+type DeferredLoadingClientConfig struct {
+	loadingRules   *ClientConfigLoadingRules
+	overrides      *ConfigOverrides
+	fallbackReader io.Reader
+}
+
+// NewNonInteractiveDeferredLoadingClientConfig creates a ConfigClientClientConfig using the passed context name
+func NewNonInteractiveDeferredLoadingClientConfig(loadingRules *ClientConfigLoadingRules, overrides *ConfigOverrides) ClientConfig {
+	return DeferredLoadingClientConfig{loadingRules, overrides, nil}
+}
+
+// NewInteractiveDeferredLoadingClientConfig creates a ConfigClientClientConfig using the passed context name and the fallback auth reader
+func NewInteractiveDeferredLoadingClientConfig(loadingRules *ClientConfigLoadingRules, overrides *ConfigOverrides, fallbackReader io.Reader) ClientConfig {
+	return DeferredLoadingClientConfig{loadingRules, overrides, fallbackReader}
+}
+
+func (config DeferredLoadingClientConfig) createClientConfig() (ClientConfig, error) {
+	mergedConfig, err := config.loadingRules.Load()
+	if err != nil {
+		return nil, err
+	}
+
+	var mergedClientConfig ClientConfig
+	if config.fallbackReader != nil {
+		mergedClientConfig = NewInteractiveClientConfig(*mergedConfig, config.overrides.CurrentContext, config.overrides, config.fallbackReader)
+	} else {
+		mergedClientConfig = NewNonInteractiveClientConfig(*mergedConfig, config.overrides.CurrentContext, config.overrides)
+	}
+
+	return mergedClientConfig, nil
+}
+
+func (config DeferredLoadingClientConfig) RawConfig() (clientcmdapi.Config, error) {
+	mergedConfig, err := config.createClientConfig()
+	if err != nil {
+		return clientcmdapi.Config{}, err
+	}
+
+	return mergedConfig.RawConfig()
+}
+
+// ClientConfig implements ClientConfig
+func (config DeferredLoadingClientConfig) ClientConfig() (*client.Config, error) {
+	mergedClientConfig, err := config.createClientConfig()
+	if err != nil {
+		return nil, err
+	}
+	mergedConfig, err := mergedClientConfig.ClientConfig()
+	if err != nil {
+		return nil, err
+	}
+	// Are we running in a cluster and were no other configs found? If so, use the in-cluster-config.
+	icc := inClusterClientConfig{}
+	defaultConfig, err := DefaultClientConfig.ClientConfig()
+	if icc.Possible() && err == nil && reflect.DeepEqual(mergedConfig, defaultConfig) {
+		glog.V(2).Info("no kubeconfig could be created, falling back to service account.")
+		return icc.ClientConfig()
+	}
+
+	return mergedConfig, nil
+}
+
+// Namespace implements KubeConfig
+func (config DeferredLoadingClientConfig) Namespace() (string, bool, error) {
+	mergedKubeConfig, err := config.createClientConfig()
+	if err != nil {
+		return "", false, err
+	}
+
+	return mergedKubeConfig.Namespace()
+}