Golang utils.GenerateRandomID函數代碼示例

func TestRegister(t *testing.T) {
	graph, _ := tempGraph(t)
	defer nukeGraph(graph)
	archive, err := fakeTar()
	if err != nil {
		t.Fatal(err)
	}
	image := &image.Image{
		ID:      utils.GenerateRandomID(),
		Comment: "testing",
		Created: time.Now(),
	}
	err = graph.Register(nil, archive, image)
	if err != nil {
		t.Fatal(err)
	}
	if images, err := graph.Map(); err != nil {
		t.Fatal(err)
	} else if l := len(images); l != 1 {
		t.Fatalf("Wrong number of images. Should be %d, not %d", 1, l)
	}
	if resultImg, err := graph.Get(image.ID); err != nil {
		t.Fatal(err)
	} else {
		if resultImg.ID != image.ID {
			t.Fatalf("Wrong image ID. Should be '%s', not '%s'", image.ID, resultImg.ID)
		}
		if resultImg.Comment != image.Comment {
			t.Fatalf("Wrong image comment. Should be '%s', not '%s'", image.Comment, resultImg.Comment)
		}
	}
}

// Mktemp creates a temporary sub-directory inside the graph's filesystem.
func (graph *Graph) Mktemp(id string) (string, error) {
	dir := path.Join(graph.Root, "_tmp", utils.GenerateRandomID())
	if err := os.MkdirAll(dir, 0700); err != nil {
		return "", err
	}
	return dir, nil
}

func BenchmarkTruncIndexNew500(b *testing.B) {
	var testSet []string
	for i := 0; i < 500; i++ {
		testSet = append(testSet, utils.GenerateRandomID())
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		NewTruncIndex(testSet)
	}
}

func TestByParent(t *testing.T) {
	archive1, _ := fakeTar()
	archive2, _ := fakeTar()
	archive3, _ := fakeTar()

	graph, _ := tempGraph(t)
	defer nukeGraph(graph)
	parentImage := &image.Image{
		ID:      utils.GenerateRandomID(),
		Comment: "parent",
		Created: time.Now(),
		Parent:  "",
	}
	childImage1 := &image.Image{
		ID:      utils.GenerateRandomID(),
		Comment: "child1",
		Created: time.Now(),
		Parent:  parentImage.ID,
	}
	childImage2 := &image.Image{
		ID:      utils.GenerateRandomID(),
		Comment: "child2",
		Created: time.Now(),
		Parent:  parentImage.ID,
	}
	_ = graph.Register(nil, archive1, parentImage)
	_ = graph.Register(nil, archive2, childImage1)
	_ = graph.Register(nil, archive3, childImage2)

	byParent, err := graph.ByParent()
	if err != nil {
		t.Fatal(err)
	}
	numChildren := len(byParent[parentImage.ID])
	if numChildren != 2 {
		t.Fatalf("Expected 2 children, found %d", numChildren)
	}
}

func BenchmarkTruncIndexAdd500(b *testing.B) {
	var testSet []string
	for i := 0; i < 500; i++ {
		testSet = append(testSet, utils.GenerateRandomID())
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		index := NewTruncIndex([]string{})
		for _, id := range testSet {
			if err := index.Add(id); err != nil {
				b.Fatal(err)
			}
		}
	}
}

func (runtime *Runtime) generateIdAndName(name string) (string, string, error) {
	var (
		err error
		id  = utils.GenerateRandomID()
	)

	if name == "" {
		name, err = generateRandomName(runtime)
		if err != nil {
			name = utils.TruncateID(id)
		}
	} else {
		if !validContainerNamePattern.MatchString(name) {
			return "", "", fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
		}
	}
	if name[0] != '/' {
		name = "/" + name
	}
	// Set the enitity in the graph using the default name specified
	if _, err := runtime.containerGraph.Set(name, id); err != nil {
		if !graphdb.IsNonUniqueNameError(err) {
			return "", "", err
		}

		conflictingContainer, err := runtime.GetByName(name)
		if err != nil {
			if strings.Contains(err.Error(), "Could not find entity") {
				return "", "", err
			}

			// Remove name and continue starting the container
			if err := runtime.containerGraph.Delete(name); err != nil {
				return "", "", err
			}
		} else {
			nameAsKnownByUser := strings.TrimPrefix(name, "/")
			return "", "", fmt.Errorf(
				"Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser,
				utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser)
		}
	}
	return id, name, nil
}

func (daemon *Daemon) generateIdAndName(name string) (string, string, error) {
	var (
		err error
		id  = utils.GenerateRandomID()
	)

	if name == "" {
		if name, err = daemon.generateNewName(id); err != nil {
			return "", "", err
		}
		return id, name, nil
	}

	if name, err = daemon.reserveName(id, name); err != nil {
		return "", "", err
	}

	return id, name, nil
}

// Create creates a new image and registers it in the graph.
func (graph *Graph) Create(layerData archive.ArchiveReader, containerID, containerImage, comment, author string, containerConfig, config *runconfig.Config) (*image.Image, error) {
	img := &image.Image{
		ID:            utils.GenerateRandomID(),
		Comment:       comment,
		Created:       time.Now().UTC(),
		DockerVersion: dockerversion.VERSION,
		Author:        author,
		Config:        config,
		Architecture:  runtime.GOARCH,
		OS:            runtime.GOOS,
	}
	if containerID != "" {
		img.Parent = containerImage
		img.Container = containerID
		img.ContainerConfig = *containerConfig
	}
	if err := graph.Register(nil, layerData, img); err != nil {
		return nil, err
	}
	return img, nil
}

// Test that Register can be interrupted cleanly without side effects
func TestInterruptedRegister(t *testing.T) {
	graph, _ := tempGraph(t)
	defer nukeGraph(graph)
	badArchive, w := io.Pipe() // Use a pipe reader as a fake archive which never yields data
	image := &image.Image{
		ID:      utils.GenerateRandomID(),
		Comment: "testing",
		Created: time.Now(),
	}
	w.CloseWithError(errors.New("But I'm not a tarball!")) // (Nobody's perfect, darling)
	graph.Register(nil, badArchive, image)
	if _, err := graph.Get(image.ID); err == nil {
		t.Fatal("Image should not exist after Register is interrupted")
	}
	// Registering the same image again should succeed if the first register was interrupted
	goodArchive, err := fakeTar()
	if err != nil {
		t.Fatal(err)
	}
	if err := graph.Register(nil, goodArchive, image); err != nil {
		t.Fatal(err)
	}
}

func BenchmarkTruncIndexGet500(b *testing.B) {
	var testSet []string
	var testKeys []string
	for i := 0; i < 500; i++ {
		testSet = append(testSet, utils.GenerateRandomID())
	}
	index := NewTruncIndex([]string{})
	for _, id := range testSet {
		if err := index.Add(id); err != nil {
			b.Fatal(err)
		}
		l := rand.Intn(12) + 12
		testKeys = append(testKeys, id[:l])
	}
	b.ResetTimer()
	for i := 0; i < b.N; i++ {
		for _, id := range testKeys {
			if res, err := index.Get(id); err != nil {
				b.Fatal(res, err)
			}
		}
	}
}

// Create creates a new container from the given configuration with a given name.
func (runtime *Runtime) Create(config *runconfig.Config, name string) (*Container, []string, error) {
	// Lookup image
	img, err := runtime.repositories.LookupImage(config.Image)
	if err != nil {
		return nil, nil, err
	}

	// We add 2 layers to the depth because the container's rw and
	// init layer add to the restriction
	depth, err := img.Depth()
	if err != nil {
		return nil, nil, err
	}

	if depth+2 >= MaxImageDepth {
		return nil, nil, fmt.Errorf("Cannot create container with more than %d parents", MaxImageDepth)
	}

	checkDeprecatedExpose := func(config *runconfig.Config) bool {
		if config != nil {
			if config.PortSpecs != nil {
				for _, p := range config.PortSpecs {
					if strings.Contains(p, ":") {
						return true
					}
				}
			}
		}
		return false
	}

	warnings := []string{}
	if checkDeprecatedExpose(img.Config) || checkDeprecatedExpose(config) {
		warnings = append(warnings, "The mapping to public ports on your host via Dockerfile EXPOSE (host:port:port) has been deprecated. Use -p to publish the ports.")
	}

	if img.Config != nil {
		if err := runconfig.Merge(config, img.Config); err != nil {
			return nil, nil, err
		}
	}

	if len(config.Entrypoint) == 0 && len(config.Cmd) == 0 {
		return nil, nil, fmt.Errorf("No command specified")
	}

	// Generate id
	id := utils.GenerateRandomID()

	if name == "" {
		name, err = generateRandomName(runtime)
		if err != nil {
			name = utils.TruncateID(id)
		}
	} else {
		if !validContainerNamePattern.MatchString(name) {
			return nil, nil, fmt.Errorf("Invalid container name (%s), only %s are allowed", name, validContainerNameChars)
		}
	}

	if name[0] != '/' {
		name = "/" + name
	}

	// Set the enitity in the graph using the default name specified
	if _, err := runtime.containerGraph.Set(name, id); err != nil {
		if !graphdb.IsNonUniqueNameError(err) {
			return nil, nil, err
		}

		conflictingContainer, err := runtime.GetByName(name)
		if err != nil {
			if strings.Contains(err.Error(), "Could not find entity") {
				return nil, nil, err
			}

			// Remove name and continue starting the container
			if err := runtime.containerGraph.Delete(name); err != nil {
				return nil, nil, err
			}
		} else {
			nameAsKnownByUser := strings.TrimPrefix(name, "/")
			return nil, nil, fmt.Errorf(
				"Conflict, The name %s is already assigned to %s. You have to delete (or rename) that container to be able to assign %s to a container again.", nameAsKnownByUser,
				utils.TruncateID(conflictingContainer.ID), nameAsKnownByUser)
		}
	}

	// Generate default hostname
	// FIXME: the lxc template no longer needs to set a default hostname
	if config.Hostname == "" {
		config.Hostname = id[:12]
	}

	var args []string
	var entrypoint string

	if len(config.Entrypoint) != 0 {
		entrypoint = config.Entrypoint[0]
//.........這裏部分代碼省略.........