зеркало из https://github.com/microsoft/docker.git
368 строки
9.9 KiB
Go
368 строки
9.9 KiB
Go
package xfer
|
|
|
|
import (
|
|
"bytes"
|
|
"errors"
|
|
"fmt"
|
|
"io"
|
|
"io/ioutil"
|
|
"runtime"
|
|
"sync/atomic"
|
|
"testing"
|
|
"time"
|
|
|
|
"github.com/docker/distribution"
|
|
"github.com/docker/docker/image"
|
|
"github.com/docker/docker/layer"
|
|
"github.com/docker/docker/pkg/progress"
|
|
"github.com/opencontainers/go-digest"
|
|
"golang.org/x/net/context"
|
|
)
|
|
|
|
const maxDownloadConcurrency = 3
|
|
|
|
type mockLayer struct {
|
|
layerData bytes.Buffer
|
|
diffID layer.DiffID
|
|
chainID layer.ChainID
|
|
parent layer.Layer
|
|
platform layer.Platform
|
|
}
|
|
|
|
func (ml *mockLayer) TarStream() (io.ReadCloser, error) {
|
|
return ioutil.NopCloser(bytes.NewBuffer(ml.layerData.Bytes())), nil
|
|
}
|
|
|
|
func (ml *mockLayer) TarStreamFrom(layer.ChainID) (io.ReadCloser, error) {
|
|
return nil, fmt.Errorf("not implemented")
|
|
}
|
|
|
|
func (ml *mockLayer) ChainID() layer.ChainID {
|
|
return ml.chainID
|
|
}
|
|
|
|
func (ml *mockLayer) DiffID() layer.DiffID {
|
|
return ml.diffID
|
|
}
|
|
|
|
func (ml *mockLayer) Parent() layer.Layer {
|
|
return ml.parent
|
|
}
|
|
|
|
func (ml *mockLayer) Size() (size int64, err error) {
|
|
return 0, nil
|
|
}
|
|
|
|
func (ml *mockLayer) DiffSize() (size int64, err error) {
|
|
return 0, nil
|
|
}
|
|
|
|
func (ml *mockLayer) Platform() layer.Platform {
|
|
return ml.platform
|
|
}
|
|
|
|
func (ml *mockLayer) Metadata() (map[string]string, error) {
|
|
return make(map[string]string), nil
|
|
}
|
|
|
|
type mockLayerStore struct {
|
|
layers map[layer.ChainID]*mockLayer
|
|
}
|
|
|
|
func createChainIDFromParent(parent layer.ChainID, dgsts ...layer.DiffID) layer.ChainID {
|
|
if len(dgsts) == 0 {
|
|
return parent
|
|
}
|
|
if parent == "" {
|
|
return createChainIDFromParent(layer.ChainID(dgsts[0]), dgsts[1:]...)
|
|
}
|
|
// H = "H(n-1) SHA256(n)"
|
|
dgst := digest.FromBytes([]byte(string(parent) + " " + string(dgsts[0])))
|
|
return createChainIDFromParent(layer.ChainID(dgst), dgsts[1:]...)
|
|
}
|
|
|
|
func (ls *mockLayerStore) Map() map[layer.ChainID]layer.Layer {
|
|
layers := map[layer.ChainID]layer.Layer{}
|
|
|
|
for k, v := range ls.layers {
|
|
layers[k] = v
|
|
}
|
|
|
|
return layers
|
|
}
|
|
|
|
func (ls *mockLayerStore) Register(reader io.Reader, parentID layer.ChainID, platform layer.Platform) (layer.Layer, error) {
|
|
return ls.RegisterWithDescriptor(reader, parentID, distribution.Descriptor{})
|
|
}
|
|
|
|
func (ls *mockLayerStore) RegisterWithDescriptor(reader io.Reader, parentID layer.ChainID, _ distribution.Descriptor) (layer.Layer, error) {
|
|
var (
|
|
parent layer.Layer
|
|
err error
|
|
)
|
|
|
|
if parentID != "" {
|
|
parent, err = ls.Get(parentID)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
l := &mockLayer{parent: parent}
|
|
_, err = l.layerData.ReadFrom(reader)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
l.diffID = layer.DiffID(digest.FromBytes(l.layerData.Bytes()))
|
|
l.chainID = createChainIDFromParent(parentID, l.diffID)
|
|
|
|
ls.layers[l.chainID] = l
|
|
return l, nil
|
|
}
|
|
|
|
func (ls *mockLayerStore) Get(chainID layer.ChainID) (layer.Layer, error) {
|
|
l, ok := ls.layers[chainID]
|
|
if !ok {
|
|
return nil, layer.ErrLayerDoesNotExist
|
|
}
|
|
return l, nil
|
|
}
|
|
|
|
func (ls *mockLayerStore) Release(l layer.Layer) ([]layer.Metadata, error) {
|
|
return []layer.Metadata{}, nil
|
|
}
|
|
func (ls *mockLayerStore) CreateRWLayer(string, layer.ChainID, *layer.CreateRWLayerOpts) (layer.RWLayer, error) {
|
|
return nil, errors.New("not implemented")
|
|
}
|
|
|
|
func (ls *mockLayerStore) GetRWLayer(string) (layer.RWLayer, error) {
|
|
return nil, errors.New("not implemented")
|
|
}
|
|
|
|
func (ls *mockLayerStore) ReleaseRWLayer(layer.RWLayer) ([]layer.Metadata, error) {
|
|
return nil, errors.New("not implemented")
|
|
}
|
|
func (ls *mockLayerStore) GetMountID(string) (string, error) {
|
|
return "", errors.New("not implemented")
|
|
}
|
|
|
|
func (ls *mockLayerStore) Cleanup() error {
|
|
return nil
|
|
}
|
|
|
|
func (ls *mockLayerStore) DriverStatus() [][2]string {
|
|
return [][2]string{}
|
|
}
|
|
|
|
func (ls *mockLayerStore) DriverName() string {
|
|
return "mock"
|
|
}
|
|
|
|
type mockDownloadDescriptor struct {
|
|
currentDownloads *int32
|
|
id string
|
|
diffID layer.DiffID
|
|
registeredDiffID layer.DiffID
|
|
expectedDiffID layer.DiffID
|
|
simulateRetries int
|
|
}
|
|
|
|
// Key returns the key used to deduplicate downloads.
|
|
func (d *mockDownloadDescriptor) Key() string {
|
|
return d.id
|
|
}
|
|
|
|
// ID returns the ID for display purposes.
|
|
func (d *mockDownloadDescriptor) ID() string {
|
|
return d.id
|
|
}
|
|
|
|
// DiffID should return the DiffID for this layer, or an error
|
|
// if it is unknown (for example, if it has not been downloaded
|
|
// before).
|
|
func (d *mockDownloadDescriptor) DiffID() (layer.DiffID, error) {
|
|
if d.diffID != "" {
|
|
return d.diffID, nil
|
|
}
|
|
return "", errors.New("no diffID available")
|
|
}
|
|
|
|
func (d *mockDownloadDescriptor) Registered(diffID layer.DiffID) {
|
|
d.registeredDiffID = diffID
|
|
}
|
|
|
|
func (d *mockDownloadDescriptor) mockTarStream() io.ReadCloser {
|
|
// The mock implementation returns the ID repeated 5 times as a tar
|
|
// stream instead of actual tar data. The data is ignored except for
|
|
// computing IDs.
|
|
return ioutil.NopCloser(bytes.NewBuffer([]byte(d.id + d.id + d.id + d.id + d.id)))
|
|
}
|
|
|
|
// Download is called to perform the download.
|
|
func (d *mockDownloadDescriptor) Download(ctx context.Context, progressOutput progress.Output) (io.ReadCloser, int64, error) {
|
|
if d.currentDownloads != nil {
|
|
defer atomic.AddInt32(d.currentDownloads, -1)
|
|
|
|
if atomic.AddInt32(d.currentDownloads, 1) > maxDownloadConcurrency {
|
|
return nil, 0, errors.New("concurrency limit exceeded")
|
|
}
|
|
}
|
|
|
|
// Sleep a bit to simulate a time-consuming download.
|
|
for i := int64(0); i <= 10; i++ {
|
|
select {
|
|
case <-ctx.Done():
|
|
return nil, 0, ctx.Err()
|
|
case <-time.After(10 * time.Millisecond):
|
|
progressOutput.WriteProgress(progress.Progress{ID: d.ID(), Action: "Downloading", Current: i, Total: 10})
|
|
}
|
|
}
|
|
|
|
if d.simulateRetries != 0 {
|
|
d.simulateRetries--
|
|
return nil, 0, errors.New("simulating retry")
|
|
}
|
|
|
|
return d.mockTarStream(), 0, nil
|
|
}
|
|
|
|
func (d *mockDownloadDescriptor) Close() {
|
|
}
|
|
|
|
func downloadDescriptors(currentDownloads *int32) []DownloadDescriptor {
|
|
return []DownloadDescriptor{
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id1",
|
|
expectedDiffID: layer.DiffID("sha256:68e2c75dc5c78ea9240689c60d7599766c213ae210434c53af18470ae8c53ec1"),
|
|
},
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id2",
|
|
expectedDiffID: layer.DiffID("sha256:64a636223116aa837973a5d9c2bdd17d9b204e4f95ac423e20e65dfbb3655473"),
|
|
},
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id3",
|
|
expectedDiffID: layer.DiffID("sha256:58745a8bbd669c25213e9de578c4da5c8ee1c836b3581432c2b50e38a6753300"),
|
|
},
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id2",
|
|
expectedDiffID: layer.DiffID("sha256:64a636223116aa837973a5d9c2bdd17d9b204e4f95ac423e20e65dfbb3655473"),
|
|
},
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id4",
|
|
expectedDiffID: layer.DiffID("sha256:0dfb5b9577716cc173e95af7c10289322c29a6453a1718addc00c0c5b1330936"),
|
|
simulateRetries: 1,
|
|
},
|
|
&mockDownloadDescriptor{
|
|
currentDownloads: currentDownloads,
|
|
id: "id5",
|
|
expectedDiffID: layer.DiffID("sha256:0a5f25fa1acbc647f6112a6276735d0fa01e4ee2aa7ec33015e337350e1ea23d"),
|
|
},
|
|
}
|
|
}
|
|
|
|
func TestSuccessfulDownload(t *testing.T) {
|
|
// TODO Windows: Fix this unit text
|
|
if runtime.GOOS == "windows" {
|
|
t.Skip("Needs fixing on Windows")
|
|
}
|
|
|
|
layerStore := &mockLayerStore{make(map[layer.ChainID]*mockLayer)}
|
|
lsMap := make(map[string]layer.Store)
|
|
lsMap[runtime.GOOS] = layerStore
|
|
ldm := NewLayerDownloadManager(lsMap, maxDownloadConcurrency, func(m *LayerDownloadManager) { m.waitDuration = time.Millisecond })
|
|
|
|
progressChan := make(chan progress.Progress)
|
|
progressDone := make(chan struct{})
|
|
receivedProgress := make(map[string]progress.Progress)
|
|
|
|
go func() {
|
|
for p := range progressChan {
|
|
receivedProgress[p.ID] = p
|
|
}
|
|
close(progressDone)
|
|
}()
|
|
|
|
var currentDownloads int32
|
|
descriptors := downloadDescriptors(¤tDownloads)
|
|
|
|
firstDescriptor := descriptors[0].(*mockDownloadDescriptor)
|
|
|
|
// Pre-register the first layer to simulate an already-existing layer
|
|
l, err := layerStore.Register(firstDescriptor.mockTarStream(), "", layer.Platform(runtime.GOOS))
|
|
if err != nil {
|
|
t.Fatal(err)
|
|
}
|
|
firstDescriptor.diffID = l.DiffID()
|
|
|
|
rootFS, releaseFunc, err := ldm.Download(context.Background(), *image.NewRootFS(), layer.Platform(runtime.GOOS), descriptors, progress.ChanOutput(progressChan))
|
|
if err != nil {
|
|
t.Fatalf("download error: %v", err)
|
|
}
|
|
|
|
releaseFunc()
|
|
|
|
close(progressChan)
|
|
<-progressDone
|
|
|
|
if len(rootFS.DiffIDs) != len(descriptors) {
|
|
t.Fatal("got wrong number of diffIDs in rootfs")
|
|
}
|
|
|
|
for i, d := range descriptors {
|
|
descriptor := d.(*mockDownloadDescriptor)
|
|
|
|
if descriptor.diffID != "" {
|
|
if receivedProgress[d.ID()].Action != "Already exists" {
|
|
t.Fatalf("did not get 'Already exists' message for %v", d.ID())
|
|
}
|
|
} else if receivedProgress[d.ID()].Action != "Pull complete" {
|
|
t.Fatalf("did not get 'Pull complete' message for %v", d.ID())
|
|
}
|
|
|
|
if rootFS.DiffIDs[i] != descriptor.expectedDiffID {
|
|
t.Fatalf("rootFS item %d has the wrong diffID (expected: %v got: %v)", i, descriptor.expectedDiffID, rootFS.DiffIDs[i])
|
|
}
|
|
|
|
if descriptor.diffID == "" && descriptor.registeredDiffID != rootFS.DiffIDs[i] {
|
|
t.Fatal("diffID mismatch between rootFS and Registered callback")
|
|
}
|
|
}
|
|
}
|
|
|
|
func TestCancelledDownload(t *testing.T) {
|
|
layerStore := &mockLayerStore{make(map[layer.ChainID]*mockLayer)}
|
|
lsMap := make(map[string]layer.Store)
|
|
lsMap[runtime.GOOS] = layerStore
|
|
ldm := NewLayerDownloadManager(lsMap, maxDownloadConcurrency, func(m *LayerDownloadManager) { m.waitDuration = time.Millisecond })
|
|
|
|
progressChan := make(chan progress.Progress)
|
|
progressDone := make(chan struct{})
|
|
|
|
go func() {
|
|
for range progressChan {
|
|
}
|
|
close(progressDone)
|
|
}()
|
|
|
|
ctx, cancel := context.WithCancel(context.Background())
|
|
|
|
go func() {
|
|
<-time.After(time.Millisecond)
|
|
cancel()
|
|
}()
|
|
|
|
descriptors := downloadDescriptors(nil)
|
|
_, _, err := ldm.Download(ctx, *image.NewRootFS(), layer.Platform(runtime.GOOS), descriptors, progress.ChanOutput(progressChan))
|
|
if err != context.Canceled {
|
|
t.Fatal("expected download to be cancelled")
|
|
}
|
|
|
|
close(progressChan)
|
|
<-progressDone
|
|
}
|