Volume Accounting Interface methods

pkg/controller/persistentvolume/persistentvolume_claim_binder_controller_test.go

@@ -420,6 +420,7 @@ func newMockRecycler(spec *volume.Spec, host volume.VolumeHost, config volume.Vo
 type mockRecycler struct {
 	path string
 	host volume.VolumeHost
+	volume.MetricsNil
 }
 
 func (r *mockRecycler) GetPath() string {

pkg/kubelet/kubelet_test.go

@@ -514,6 +514,7 @@ func TestGetPodVolumesFromDisk(t *testing.T) {
 
 type stubVolume struct {
 	path string
+	volume.MetricsNil
 }
 
 func (f *stubVolume) GetPath() string {
@@ -559,9 +560,9 @@ func TestMakeVolumeMounts(t *testing.T) {
 	}
 
 	podVolumes := kubecontainer.VolumeMap{
-		"disk":  kubecontainer.VolumeInfo{Builder: &stubVolume{"/mnt/disk"}},
-		"disk4": kubecontainer.VolumeInfo{Builder: &stubVolume{"/mnt/host"}},
-		"disk5": kubecontainer.VolumeInfo{Builder: &stubVolume{"/var/lib/kubelet/podID/volumes/empty/disk5"}},
+		"disk":  kubecontainer.VolumeInfo{Builder: &stubVolume{path: "/mnt/disk"}},
+		"disk4": kubecontainer.VolumeInfo{Builder: &stubVolume{path: "/mnt/host"}},
+		"disk5": kubecontainer.VolumeInfo{Builder: &stubVolume{path: "/var/lib/kubelet/podID/volumes/empty/disk5"}},
 	}
 
 	pod := api.Pod{

pkg/volume/aws_ebs/aws_ebs.go

@@ -144,6 +144,7 @@ type awsElasticBlockStore struct {
 	// Mounter interface that provides system calls to mount the global path to the pod local path.
 	mounter mount.Interface
 	plugin  *awsElasticBlockStorePlugin
+	volume.MetricsNil
 }
 
 func detachDiskLogError(ebs *awsElasticBlockStore) {

pkg/volume/cephfs/cephfs.go

@@ -143,6 +143,7 @@ type cephfs struct {
 	readonly    bool
 	mounter     mount.Interface
 	plugin      *cephfsPlugin
+	volume.MetricsNil
 }
 
 type cephfsBuilder struct {

pkg/volume/cinder/cinder.go

@@ -144,6 +144,7 @@ type cinderVolume struct {
 	// diskMounter provides the interface that is used to mount the actual block device.
 	blockDeviceMounter mount.Interface
 	plugin             *cinderPlugin
+	volume.MetricsNil
 }
 
 func detachDiskLogError(cd *cinderVolume) {

pkg/volume/downwardapi/downwardapi.go

@@ -90,6 +90,7 @@ type downwardAPIVolume struct {
 	pod                     *api.Pod
 	podUID                  types.UID // TODO: remove this redundancy as soon NewCleaner func will have *api.POD and not only types.UID
 	plugin                  *downwardAPIPlugin
+	volume.MetricsNil
 }
 
 // This is the spec for the volume that this plugin wraps.

pkg/volume/empty_dir/empty_dir.go

@@ -79,13 +79,14 @@ func (plugin *emptyDirPlugin) newBuilderInternal(spec *volume.Spec, pod *api.Pod
 		medium = spec.Volume.EmptyDir.Medium
 	}
 	return &emptyDir{
-		pod:           pod,
-		volName:       spec.Name(),
-		medium:        medium,
-		mounter:       mounter,
-		mountDetector: mountDetector,
-		plugin:        plugin,
-		rootContext:   opts.RootContext,
+		pod:             pod,
+		volName:         spec.Name(),
+		medium:          medium,
+		mounter:         mounter,
+		mountDetector:   mountDetector,
+		plugin:          plugin,
+		rootContext:     opts.RootContext,
+		MetricsProvider: volume.NewMetricsDu(GetPath(pod.UID, spec.Name(), plugin.host)),
 	}, nil
 }
 
@@ -96,12 +97,13 @@ func (plugin *emptyDirPlugin) NewCleaner(volName string, podUID types.UID) (volu
 
 func (plugin *emptyDirPlugin) newCleanerInternal(volName string, podUID types.UID, mounter mount.Interface, mountDetector mountDetector) (volume.Cleaner, error) {
 	ed := &emptyDir{
-		pod:           &api.Pod{ObjectMeta: api.ObjectMeta{UID: podUID}},
-		volName:       volName,
-		medium:        api.StorageMediumDefault, // might be changed later
-		mounter:       mounter,
-		mountDetector: mountDetector,
-		plugin:        plugin,
+		pod:             &api.Pod{ObjectMeta: api.ObjectMeta{UID: podUID}},
+		volName:         volName,
+		medium:          api.StorageMediumDefault, // might be changed later
+		mounter:         mounter,
+		mountDetector:   mountDetector,
+		plugin:          plugin,
+		MetricsProvider: volume.NewMetricsDu(GetPath(podUID, volName, plugin.host)),
 	}
 	return ed, nil
 }
@@ -133,6 +135,7 @@ type emptyDir struct {
 	mountDetector mountDetector
 	plugin        *emptyDirPlugin
 	rootContext   string
+	volume.MetricsProvider
 }
 
 func (ed *emptyDir) GetAttributes() volume.Attributes {
@@ -265,8 +268,12 @@ func (ed *emptyDir) setupDir(dir string) error {
 }
 
 func (ed *emptyDir) GetPath() string {
+	return GetPath(ed.pod.UID, ed.volName, ed.plugin.host)
+}
+
+func GetPath(uid types.UID, volName string, host volume.VolumeHost) string {
 	name := emptyDirPluginName
-	return ed.plugin.host.GetPodVolumeDir(ed.pod.UID, util.EscapeQualifiedNameForDisk(name), ed.volName)
+	return host.GetPodVolumeDir(uid, util.EscapeQualifiedNameForDisk(name), volName)
 }
 
 // TearDown simply discards everything in the directory.

pkg/volume/empty_dir/empty_dir_test.go

@@ -274,3 +274,42 @@ func TestPluginBackCompat(t *testing.T) {
 		t.Errorf("Got unexpected path: %s", volPath)
 	}
 }
+
+// TestMetrics tests that MetricProvider methods return sane values.
+func TestMetrics(t *testing.T) {
+	// Create an empty temp directory for the volume
+	tmpDir, err := ioutil.TempDir(os.TempDir(), "empty_dir_test")
+	if err != nil {
+		t.Fatalf("Can't make a tmp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	plug := makePluginUnderTest(t, "kubernetes.io/empty-dir", tmpDir)
+
+	spec := &api.Volume{
+		Name: "vol1",
+	}
+	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
+	builder, err := plug.NewBuilder(volume.NewSpecFromVolume(spec), pod, volume.VolumeOptions{RootContext: ""})
+	if err != nil {
+		t.Errorf("Failed to make a new Builder: %v", err)
+	}
+
+	// Need to create the subdirectory
+	os.MkdirAll(builder.GetPath(), 0755)
+
+	// TODO(pwittroc): Move this into a reusable testing utility
+	metrics, err := builder.GetMetrics()
+	if err != nil {
+		t.Errorf("Unexpected error when calling GetMetrics %v", err)
+	}
+	if metrics.Used.Value() != 4096 {
+		t.Errorf("Expected Used %d to be 4096", metrics.Used.Value())
+	}
+	if metrics.Capacity.Value() <= 0 {
+		t.Errorf("Expected Capacity to be greater than 0")
+	}
+	if metrics.Available.Value() <= 0 {
+		t.Errorf("Expected Available to be greater than 0")
+	}
+}

pkg/volume/fc/fc.go

@@ -149,6 +149,7 @@ type fcDisk struct {
 	manager diskManager
 	// io handler interface
 	io ioHandler
+	volume.MetricsNil
 }
 
 func (fc *fcDisk) GetPath() string {

pkg/volume/flocker/plugin.go

@@ -111,6 +111,7 @@ type flockerBuilder struct {
 	exe      exec.Interface
 	opts     volume.VolumeOptions
 	readOnly bool
+	volume.MetricsNil
 }
 
 func (b flockerBuilder) GetAttributes() volume.Attributes {

pkg/volume/gce_pd/gce_pd.go

@@ -144,6 +144,7 @@ type gcePersistentDisk struct {
 	// Mounter interface that provides system calls to mount the global path to the pod local path.
 	mounter mount.Interface
 	plugin  *gcePersistentDiskPlugin
+	volume.MetricsNil
 }
 
 func detachDiskLogError(pd *gcePersistentDisk) {

pkg/volume/git_repo/git_repo.go

@@ -89,6 +89,7 @@ type gitRepoVolume struct {
 	volName string
 	podUID  types.UID
 	plugin  *gitRepoPlugin
+	volume.MetricsNil
 }
 
 var _ volume.Volume = &gitRepoVolume{}

pkg/volume/glusterfs/glusterfs.go

@@ -142,6 +142,7 @@ type glusterfs struct {
 	pod     *api.Pod
 	mounter mount.Interface
 	plugin  *glusterfsPlugin
+	volume.MetricsNil
 }
 
 type glusterfsBuilder struct {

pkg/volume/host_path/host_path.go

@@ -95,20 +95,25 @@ func (plugin *hostPathPlugin) GetAccessModes() []api.PersistentVolumeAccessMode
 
 func (plugin *hostPathPlugin) NewBuilder(spec *volume.Spec, pod *api.Pod, _ volume.VolumeOptions) (volume.Builder, error) {
 	if spec.Volume != nil && spec.Volume.HostPath != nil {
+		path := spec.Volume.HostPath.Path
 		return &hostPathBuilder{
-			hostPath: &hostPath{path: spec.Volume.HostPath.Path},
+			hostPath: &hostPath{path: path, MetricsProvider: volume.NewMetricsDu(path)},
 			readOnly: false,
 		}, nil
 	} else {
+		path := spec.PersistentVolume.Spec.HostPath.Path
 		return &hostPathBuilder{
-			hostPath: &hostPath{path: spec.PersistentVolume.Spec.HostPath.Path},
+			hostPath: &hostPath{path: path, MetricsProvider: volume.NewMetricsDu(path)},
 			readOnly: spec.ReadOnly,
 		}, nil
 	}
 }
 
 func (plugin *hostPathPlugin) NewCleaner(volName string, podUID types.UID) (volume.Cleaner, error) {
-	return &hostPathCleaner{&hostPath{""}}, nil
+	return &hostPathCleaner{&hostPath{
+		path:            "",
+		MetricsProvider: volume.NewMetricsDu(""),
+	}}, nil
 }
 
 func (plugin *hostPathPlugin) NewRecycler(spec *volume.Spec) (volume.Recycler, error) {
@@ -130,20 +135,23 @@ func newRecycler(spec *volume.Spec, host volume.VolumeHost, config volume.Volume
 	if spec.PersistentVolume == nil || spec.PersistentVolume.Spec.HostPath == nil {
 		return nil, fmt.Errorf("spec.PersistentVolumeSource.HostPath is nil")
 	}
+	path := spec.PersistentVolume.Spec.HostPath.Path
 	return &hostPathRecycler{
-		name:    spec.Name(),
-		path:    spec.PersistentVolume.Spec.HostPath.Path,
-		host:    host,
-		config:  config,
-		timeout: volume.CalculateTimeoutForVolume(config.RecyclerMinimumTimeout, config.RecyclerTimeoutIncrement, spec.PersistentVolume),
+		name:            spec.Name(),
+		path:            path,
+		host:            host,
+		config:          config,
+		timeout:         volume.CalculateTimeoutForVolume(config.RecyclerMinimumTimeout, config.RecyclerTimeoutIncrement, spec.PersistentVolume),
+		MetricsProvider: volume.NewMetricsDu(path),
 	}, nil
 }
 
 func newDeleter(spec *volume.Spec, host volume.VolumeHost) (volume.Deleter, error) {
 	if spec.PersistentVolume != nil && spec.PersistentVolume.Spec.HostPath == nil {
 		return nil, fmt.Errorf("spec.PersistentVolumeSource.HostPath is nil")
 	}
-	return &hostPathDeleter{spec.Name(), spec.PersistentVolume.Spec.HostPath.Path, host}, nil
+	path := spec.PersistentVolume.Spec.HostPath.Path
+	return &hostPathDeleter{spec.Name(), path, host, volume.NewMetricsDu(path)}, nil
 }
 
 func newCreater(options volume.VolumeOptions, host volume.VolumeHost) (volume.Creater, error) {
@@ -154,6 +162,7 @@ func newCreater(options volume.VolumeOptions, host volume.VolumeHost) (volume.Cr
 // The direct at the specified path will be directly exposed to the container.
 type hostPath struct {
 	path string
+	volume.MetricsProvider
 }
 
 func (hp *hostPath) GetPath() string {
@@ -214,6 +223,7 @@ type hostPathRecycler struct {
 	host    volume.VolumeHost
 	config  volume.VolumeConfig
 	timeout int64
+	volume.MetricsProvider
 }
 
 func (r *hostPathRecycler) GetPath() string {
@@ -280,6 +290,7 @@ type hostPathDeleter struct {
 	name string
 	path string
 	host volume.VolumeHost
+	volume.MetricsProvider
 }
 
 func (r *hostPathDeleter) GetPath() string {

pkg/volume/host_path/host_path_test.go

@@ -18,6 +18,7 @@ package host_path
 
 import (
 	"fmt"
+	"io/ioutil"
 	"os"
 	"testing"
 
@@ -92,7 +93,7 @@ func TestDeleter(t *testing.T) {
 	defer os.RemoveAll(tempPath)
 	err := os.MkdirAll(tempPath, 0750)
 	if err != nil {
-		t.Fatal("Failed to create tmp directory for deleter: %v", err)
+		t.Fatalf("Failed to create tmp directory for deleter: %v", err)
 	}
 
 	plugMgr := volume.VolumePluginMgr{}
@@ -272,3 +273,45 @@ func TestPersistentClaimReadOnlyFlag(t *testing.T) {
 		t.Errorf("Expected true for builder.IsReadOnly")
 	}
 }
+
+// TestMetrics tests that MetricProvider methods return sane values.
+func TestMetrics(t *testing.T) {
+	// Create an empty temp directory for the volume
+	tmpDir, err := ioutil.TempDir(os.TempDir(), "host_path_test")
+	if err != nil {
+		t.Fatalf("Can't make a tmp dir: %v", err)
+	}
+	defer os.RemoveAll(tmpDir)
+
+	plugMgr := volume.VolumePluginMgr{}
+	plugMgr.InitPlugins(ProbeVolumePlugins(volume.VolumeConfig{}), volume.NewFakeVolumeHost(tmpDir, nil, nil))
+
+	plug, err := plugMgr.FindPluginByName("kubernetes.io/host-path")
+	if err != nil {
+		t.Errorf("Can't find the plugin by name")
+	}
+	spec := &api.Volume{
+		Name:         "vol1",
+		VolumeSource: api.VolumeSource{HostPath: &api.HostPathVolumeSource{Path: tmpDir}},
+	}
+	pod := &api.Pod{ObjectMeta: api.ObjectMeta{UID: types.UID("poduid")}}
+	builder, err := plug.NewBuilder(volume.NewSpecFromVolume(spec), pod, volume.VolumeOptions{})
+	if err != nil {
+		t.Errorf("Failed to make a new Builder: %v", err)
+	}
+
+	// TODO(pwittroc): Move this into a reusable testing utility
+	metrics, err := builder.GetMetrics()
+	if err != nil {
+		t.Errorf("Unexpected error when calling GetMetrics %v", err)
+	}
+	if metrics.Used.Value() != 4096 {
+		t.Errorf("Expected Used %d to be 4096", metrics.Used)
+	}
+	if metrics.Capacity.Value() <= 0 {
+		t.Errorf("Expected Capacity to be greater than 0")
+	}
+	if metrics.Available.Value() <= 0 {
+		t.Errorf("Expected Available to be greater than 0")
+	}
+}

pkg/volume/iscsi/iscsi.go

@@ -147,6 +147,7 @@ type iscsiDisk struct {
 	plugin  *iscsiPlugin
 	// Utility interface that provides API calls to the provider to attach/detach disks.
 	manager diskManager
+	volume.MetricsNil
 }
 
 func (iscsi *iscsiDisk) GetPath() string {