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[eclipse-kanto#53] Unit test the resources clean up implementation
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Covered the containerd client internal logic.
Covered the resources monitoring mechanism.
Optimized watched resources disposal.
Improved input parameters readability for the containerd internal client initialization.

Signed-off-by: Konstantina Gramatova <[email protected]>
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@konstantina-gramatova
konstantina-gramatova committed Sep 19, 2022
1 parent 483e508 commit 0b706c0
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Showing 8 changed files with 808 additions and 52 deletions.
2 changes: 1 addition & 1 deletion containerm/ctr/ctrd_client_init.go
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Original file line number Diff line number Diff line change
Expand Up @@ -24,7 +24,7 @@ import (
"github.com/eclipse-kanto/container-management/containerm/util"
)

func newContainerdClient(namespace, socket, rootExec, metaPath string, registryConfigs map[string]*RegistryConfig, imageDecKeys, imageDecRecipients []string, runcRuntime types.Runtime, imageExpiry time.Duration, imageExpiryDisable bool, leaseID string) (ContainerAPIClient, error) {
func newContainerdClient(namespace string, socket string, rootExec string, metaPath string, registryConfigs map[string]*RegistryConfig, imageDecKeys, imageDecRecipients []string, runcRuntime types.Runtime, imageExpiry time.Duration, imageExpiryDisable bool, leaseID string) (ContainerAPIClient, error) {

//ensure storage
err := util.MkDir(rootExec)
Expand Down
168 changes: 164 additions & 4 deletions containerm/ctr/ctrd_client_internal_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1144,7 +1144,7 @@ func TestClientInternalProcessEvents(t *testing.T) {
}

func TestClientInternalIsImageUsed(t *testing.T) {
testImgRef := "test.image/ref:latest"
const testImgRef = "test.image/ref:latest"
entryDigest := digest.NewDigest(digest.SHA256, sha256.New())

testCases := map[string]struct {
Expand Down Expand Up @@ -1200,7 +1200,7 @@ func TestClientInternalIsImageUsed(t *testing.T) {
}

func TestClientInternalRemoveUnusedImage(t *testing.T) {
testImgRef := "test.image/ref:latest"
const testImgRef = "test.image/ref:latest"
entryDigest := digest.NewDigest(digest.SHA256, sha256.New())

testCases := map[string]struct {
Expand All @@ -1222,6 +1222,15 @@ func TestClientInternalRemoveUnusedImage(t *testing.T) {
return errImageIsInUse
},
},
"test_not_used_delete_not_found_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, imageMock *mocksContainerd.MockImage) error {
imageMock.EXPECT().Name().Return(testImgRef).Times(2)
imageMock.EXPECT().RootFS(ctx).Return([]digest.Digest{entryDigest}, nil)
spiMock.EXPECT().ListSnapshots(ctx, fmt.Sprintf(snapshotsWalkFilterFormat, entryDigest.String())).Return(nil, nil)
spiMock.EXPECT().DeleteImage(ctx, testImgRef).Return(errdefs.ErrNotFound)
return nil
},
},
"test_not_used_delete_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, imageMock *mocksContainerd.MockImage) error {
imageMock.EXPECT().Name().Return(testImgRef).Times(2)
Expand Down Expand Up @@ -1266,7 +1275,7 @@ func TestClientInternalRemoveUnusedImage(t *testing.T) {
}

func TestClientInternalHandleImageExpired(t *testing.T) {
testImgRef := "test.image/ref:latest"
const testImgRef = "test.image/ref:latest"
entryDigest := digest.NewDigest(digest.SHA256, sha256.New())

testCases := map[string]struct {
Expand Down Expand Up @@ -1294,6 +1303,15 @@ func TestClientInternalHandleImageExpired(t *testing.T) {
return err
},
},
"test_used_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(imageMock, nil)
imageMock.EXPECT().Name().Return(testImgRef).Times(2)
imageMock.EXPECT().RootFS(ctx).Return([]digest.Digest{entryDigest}, nil)
spiMock.EXPECT().ListSnapshots(ctx, fmt.Sprintf(snapshotsWalkFilterFormat, entryDigest.String())).Return([]snapshots.Info{{}}, nil)
return nil
},
},
"test_no_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(imageMock, nil)
Expand Down Expand Up @@ -1329,7 +1347,7 @@ func TestClientInternalHandleImageExpired(t *testing.T) {
}

func TestClientInternalManageImageExpiry(t *testing.T) {
testImgRef := "test.image/ref:latest"
const testImgRef = "test.image/ref:latest"
entryDigest := digest.NewDigest(digest.SHA256, sha256.New())

testCases := map[string]struct {
Expand Down Expand Up @@ -1421,3 +1439,145 @@ func TestClientInternalManageImageExpiry(t *testing.T) {
})
}
}
func TestClientInternalHandleImageExpiryOnRemove(t *testing.T) {
const (
testImgRef = "test.image/ref:latest"
imagesExpiry = 2 * time.Hour
)

testCases := map[string]struct {
imagesExpiryDisabled bool
mockExec func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error
}{
"test_get_image_error": {
imagesExpiryDisabled: false,
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, _ *MockresourcesWatcher, _ *mocksContainerd.MockImage) error {
err := log.NewError("test error")
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(nil, err)
return err
},
},
"test_manage_expiry_error": {
imagesExpiryDisabled: false,
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(imageMock, nil)
imageMock.EXPECT().Name().Return(testImgRef)
imageMock.EXPECT().Metadata().Return(images.Image{CreatedAt: time.Now().Add(-5 * time.Minute)})
err := log.NewError("test error")
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(err)
return err
},
},
"test_manage_expiry_no_error": {
imagesExpiryDisabled: false,
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(imageMock, nil)
imageMock.EXPECT().Name().Return(testImgRef)
imageMock.EXPECT().Metadata().Return(images.Image{CreatedAt: time.Now().Add(-5 * time.Minute)})
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(nil)
return nil
},
},
"test_disabled": {
imagesExpiryDisabled: true,
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().GetImage(ctx, testImgRef).Return(imageMock, nil).Times(0)
imageMock.EXPECT().Name().Return(testImgRef).Times(0)
imageMock.EXPECT().Metadata().Return(images.Image{CreatedAt: time.Now().Add(-5 * time.Minute)}).Times(0)
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(nil).Times(0)
return nil
},
},
}

for testCaseName, testCaseData := range testCases {
t.Run(testCaseName, func(t *testing.T) {
t.Log(testCaseName)

ctrl := gomock.NewController(t)
defer ctrl.Finish()
// init mocks
spiMock := mocksCtrd.NewMockcontainerdSpi(ctrl)
watcherMock := NewMockresourcesWatcher(ctrl)
imageMock := mocksContainerd.NewMockImage(ctrl)

ctx := context.Background()
ctrdClient := &containerdClient{
spi: spiMock,
imagesWatcher: watcherMock,
imageExpiry: imagesExpiry,
imageExpiryDisable: testCaseData.imagesExpiryDisabled,
}
// mock exec
expectedErr := testCaseData.mockExec(ctx, spiMock, watcherMock, imageMock)

err := ctrdClient.handleImageExpiryOnRemove(ctx, testImgRef)
testutil.AssertError(t, expectedErr, err)
})
}
}

func TestClientInternalInitImagesExpiryManagement(t *testing.T) {
const (
testImgRef = "test.image/ref:latest"
imagesExpiry = 2 * time.Hour
)

testCases := map[string]struct {
mockExec func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error
}{
"test_list_images_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, _ *MockresourcesWatcher, _ *mocksContainerd.MockImage) error {
err := log.NewError("test error")
spiMock.EXPECT().ListImages(ctx).Return(nil, err)
return err
},
},
"test_watch_image_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().ListImages(ctx).Return([]containerd.Image{imageMock, imageMock}, nil)
imageMock.EXPECT().Name().Return(testImgRef).Times(4)
imageMock.EXPECT().Metadata().Return(images.Image{CreatedAt: time.Now().Add(-5 * time.Minute)}).Times(2) // not expired
err := log.NewError("test error")
gomock.InOrder(
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(err), // only first one fails
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(nil),
)
return nil
},
},
"test_no_error": {
mockExec: func(ctx context.Context, spiMock *mocksCtrd.MockcontainerdSpi, watcherMock *MockresourcesWatcher, imageMock *mocksContainerd.MockImage) error {
spiMock.EXPECT().ListImages(ctx).Return([]containerd.Image{imageMock, imageMock}, nil)
imageMock.EXPECT().Name().Return(testImgRef).Times(4)
imageMock.EXPECT().Metadata().Return(images.Image{CreatedAt: time.Now().Add(-5 * time.Minute)}).Times(2) // not expired
watcherMock.EXPECT().Watch(testImgRef, gomock.Any(), gomock.Any()).Return(nil).Times(2)
return nil
},
},
}
for testCaseName, testCaseData := range testCases {
t.Run(testCaseName, func(t *testing.T) {
t.Log(testCaseName)

ctrl := gomock.NewController(t)
defer ctrl.Finish()
// init mocks
spiMock := mocksCtrd.NewMockcontainerdSpi(ctrl)
watcherMock := NewMockresourcesWatcher(ctrl)
imageMock := mocksContainerd.NewMockImage(ctrl)

ctx := context.Background()
ctrdClient := &containerdClient{
spi: spiMock,
imagesWatcher: watcherMock,
imageExpiry: imagesExpiry,
}
// mock exec
expectedErr := testCaseData.mockExec(ctx, spiMock, watcherMock, imageMock)

err := ctrdClient.initImagesExpiryManagement(ctx)
testutil.AssertError(t, expectedErr, err)
})
}
}
34 changes: 19 additions & 15 deletions containerm/ctr/ctrd_resource_watcher.go
View file
Original file line number Diff line number Diff line change
Expand Up @@ -36,16 +36,18 @@ type watchInfo struct {

type resWatcher struct {
sync.Mutex
watchCache map[string]watchInfo
watchCacheLock sync.RWMutex
watcherCtx context.Context
watcherCtxCancel context.CancelFunc
watchCache map[string]watchInfo
watchCacheLock sync.RWMutex
watcherCtx context.Context
watcherCtxCancel context.CancelFunc
watchCacheWaitGroup *sync.WaitGroup
}

func newResourcesWatcher(ctx context.Context) resourcesWatcher {
watcher := &resWatcher{
watchCache: make(map[string]watchInfo),
watchCacheLock: sync.RWMutex{},
watchCache: make(map[string]watchInfo),
watchCacheLock: sync.RWMutex{},
watchCacheWaitGroup: &sync.WaitGroup{},
}
watcher.watcherCtx, watcher.watcherCtxCancel = context.WithCancel(ctx)
return watcher
Expand All @@ -72,17 +74,20 @@ func (watcher *resWatcher) Watch(resourceID string, duration time.Duration, expi
expiredHandler: expiredHandler,
}
watcher.watchCache[info.resourceID] = info
watcher.watchCacheWaitGroup.Add(1)
go func(ctx context.Context, info watchInfo) {
defer watcher.watchCacheWaitGroup.Done()
select {
case <-info.timer.C:
if info.expiredHandler != nil {
if err := info.expiredHandler(ctx, info.resourceID); err != nil {
log.WarnErr(err, "error while handling monitoring expiry for resource %s", info.resourceID)
}
}
watcher.cleanCache(info.resourceID)
watcher.cleanCache(info.resourceID, false)
log.Debug("successfully processed expired resource %s", info.resourceID)
case <-ctx.Done():
watcher.cleanCache(info.resourceID, true)
log.Debug("cancelled monitoring for resource %s", info.resourceID)
}
log.Debug("finished watch process for resource %s", info.resourceID)
Expand All @@ -97,23 +102,22 @@ func (watcher *resWatcher) Dispose() {
log.Debug("resource watcher is disposing")
watcher.watcherCtxCancel()

watcher.watchCacheLock.RLock()
defer watcher.watchCacheLock.RUnlock()
log.Debug("waiting for monitoring routines to finish")
watcher.watchCacheWaitGroup.Wait()

for infoKey, info := range watcher.watchCache {
log.Debug("stopping monitoring for resource %s", infoKey)
info.timer.Stop()
}
log.Debug("resource watcher disposed")
}
func (watcher *resWatcher) cleanCache(id string) {
func (watcher *resWatcher) cleanCache(id string, withStop bool) {
watcher.watchCacheLock.Lock()
defer watcher.watchCacheLock.Unlock()
info, ok := watcher.watchCache[id]
if ok {
if withStop && info.timer.Stop() {
log.Debug("stopped monitoring timer for resource %s", info.resourceID)
}
delete(watcher.watchCache, id)
log.Debug("removed watch cache for resource %s", info.resourceID)
} else {
log.Debug("no watch cache to remove for resource %s", info.resourceID)
log.Warn("no watch cache found for resource %s", info.resourceID)
}
}
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