kubelet: move PodManager and MirrorClient to a subpackage

This change moves pod_manager.go and mirror_client.go to a separate package.
Also made necessary, minor changes to facilitate testing.

pkg/kubelet/pod/mirror_client.go

@@ -0,0 +1,89 @@
+/*
+Copyright 2015 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 pod
+
+import (
+	"github.com/golang/glog"
+	"k8s.io/kubernetes/pkg/api"
+	client "k8s.io/kubernetes/pkg/client/unversioned"
+	kubecontainer "k8s.io/kubernetes/pkg/kubelet/container"
+	kubetypes "k8s.io/kubernetes/pkg/kubelet/types"
+)
+
+// Mirror client is used to create/delete a mirror pod.
+type MirrorClient interface {
+	CreateMirrorPod(*api.Pod) error
+	DeleteMirrorPod(string) error
+}
+
+type basicMirrorClient struct {
+	// mirror pods are stored in the kubelet directly because they need to be
+	// in sync with the internal pods.
+	apiserverClient client.Interface
+}
+
+func NewBasicMirrorClient(apiserverClient client.Interface) MirrorClient {
+	return &basicMirrorClient{apiserverClient: apiserverClient}
+}
+
+// Creates a mirror pod.
+func (mc *basicMirrorClient) CreateMirrorPod(pod *api.Pod) error {
+	if mc.apiserverClient == nil {
+		return nil
+	}
+	// Make a copy of the pod.
+	copyPod := *pod
+	copyPod.Annotations = make(map[string]string)
+
+	for k, v := range pod.Annotations {
+		copyPod.Annotations[k] = v
+	}
+	copyPod.Annotations[kubetypes.ConfigMirrorAnnotationKey] = kubetypes.MirrorType
+
+	_, err := mc.apiserverClient.Pods(copyPod.Namespace).Create(&copyPod)
+	return err
+}
+
+// Deletes a mirror pod.
+func (mc *basicMirrorClient) DeleteMirrorPod(podFullName string) error {
+	if mc.apiserverClient == nil {
+		return nil
+	}
+	name, namespace, err := kubecontainer.ParsePodFullName(podFullName)
+	if err != nil {
+		glog.Errorf("Failed to parse a pod full name %q", podFullName)
+		return err
+	}
+	glog.V(4).Infof("Deleting a mirror pod %q", podFullName)
+	if err := mc.apiserverClient.Pods(namespace).Delete(name, api.NewDeleteOptions(0)); err != nil {
+		glog.Errorf("Failed deleting a mirror pod %q: %v", podFullName, err)
+	}
+	return nil
+}
+
+func IsStaticPod(pod *api.Pod) bool {
+	source, err := kubetypes.GetPodSource(pod)
+	return err == nil && source != kubetypes.ApiserverSource
+}
+
+func IsMirrorPod(pod *api.Pod) bool {
+	if value, ok := pod.Annotations[kubetypes.ConfigMirrorAnnotationKey]; !ok {
+		return false
+	} else {
+		return value == kubetypes.MirrorType
+	}
+}