e79324edd8
Signed-off-by: Richard Scothern <richard.scothern@gmail.com>
263 lines
6.4 KiB
Go
263 lines
6.4 KiB
Go
package inmemory
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import (
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"bytes"
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"fmt"
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"io"
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"io/ioutil"
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"sync"
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"time"
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"github.com/docker/distribution/context"
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storagedriver "github.com/docker/distribution/registry/storage/driver"
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"github.com/docker/distribution/registry/storage/driver/base"
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"github.com/docker/distribution/registry/storage/driver/factory"
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)
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const driverName = "inmemory"
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func init() {
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factory.Register(driverName, &inMemoryDriverFactory{})
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}
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// inMemoryDriverFacotry implements the factory.StorageDriverFactory interface.
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type inMemoryDriverFactory struct{}
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func (factory *inMemoryDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
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return New(), nil
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}
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type driver struct {
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root *dir
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mutex sync.RWMutex
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}
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// baseEmbed allows us to hide the Base embed.
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type baseEmbed struct {
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base.Base
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}
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// Driver is a storagedriver.StorageDriver implementation backed by a local map.
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// Intended solely for example and testing purposes.
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type Driver struct {
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baseEmbed // embedded, hidden base driver.
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}
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var _ storagedriver.StorageDriver = &Driver{}
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// New constructs a new Driver.
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func New() *Driver {
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return &Driver{
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baseEmbed: baseEmbed{
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Base: base.Base{
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StorageDriver: &driver{
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root: &dir{
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common: common{
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p: "/",
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mod: time.Now(),
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},
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},
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},
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},
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},
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}
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}
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// Implement the storagedriver.StorageDriver interface.
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func (d *driver) Name() string {
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return driverName
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}
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// GetContent retrieves the content stored at "path" as a []byte.
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func (d *driver) GetContent(ctx context.Context, path string) ([]byte, error) {
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d.mutex.RLock()
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defer d.mutex.RUnlock()
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rc, err := d.ReadStream(ctx, path, 0)
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if err != nil {
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return nil, err
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}
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defer rc.Close()
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return ioutil.ReadAll(rc)
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}
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// PutContent stores the []byte content at a location designated by "path".
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func (d *driver) PutContent(ctx context.Context, p string, contents []byte) error {
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d.mutex.Lock()
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defer d.mutex.Unlock()
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f, err := d.root.mkfile(p)
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if err != nil {
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// TODO(stevvooe): Again, we need to clarify when this is not a
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// directory in StorageDriver API.
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return fmt.Errorf("not a file")
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}
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f.truncate()
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f.WriteAt(contents, 0)
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return nil
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}
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// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
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// given byte offset.
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func (d *driver) ReadStream(ctx context.Context, path string, offset int64) (io.ReadCloser, error) {
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d.mutex.RLock()
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defer d.mutex.RUnlock()
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if offset < 0 {
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return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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}
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path = normalize(path)
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found := d.root.find(path)
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if found.path() != path {
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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if found.isdir() {
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return nil, fmt.Errorf("%q is a directory", path)
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}
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return ioutil.NopCloser(found.(*file).sectionReader(offset)), nil
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}
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// WriteStream stores the contents of the provided io.ReadCloser at a location
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// designated by the given path.
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func (d *driver) WriteStream(ctx context.Context, path string, offset int64, reader io.Reader) (nn int64, err error) {
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d.mutex.Lock()
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defer d.mutex.Unlock()
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if offset < 0 {
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return 0, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
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}
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normalized := normalize(path)
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f, err := d.root.mkfile(normalized)
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if err != nil {
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return 0, fmt.Errorf("not a file")
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}
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// Unlock while we are reading from the source, in case we are reading
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// from the same mfs instance. This can be fixed by a more granular
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// locking model.
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d.mutex.Unlock()
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d.mutex.RLock() // Take the readlock to block other writers.
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var buf bytes.Buffer
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nn, err = buf.ReadFrom(reader)
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if err != nil {
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// TODO(stevvooe): This condition is odd and we may need to clarify:
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// we've read nn bytes from reader but have written nothing to the
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// backend. What is the correct return value? Really, the caller needs
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// to know that the reader has been advanced and reattempting the
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// operation is incorrect.
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d.mutex.RUnlock()
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d.mutex.Lock()
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return nn, err
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}
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d.mutex.RUnlock()
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d.mutex.Lock()
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f.WriteAt(buf.Bytes(), offset)
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return nn, err
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}
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// Stat returns info about the provided path.
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func (d *driver) Stat(ctx context.Context, path string) (storagedriver.FileInfo, error) {
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d.mutex.RLock()
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defer d.mutex.RUnlock()
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normalized := normalize(path)
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found := d.root.find(path)
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if found.path() != normalized {
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return nil, storagedriver.PathNotFoundError{Path: path}
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}
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fi := storagedriver.FileInfoFields{
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Path: path,
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IsDir: found.isdir(),
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ModTime: found.modtime(),
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}
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if !fi.IsDir {
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fi.Size = int64(len(found.(*file).data))
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}
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return storagedriver.FileInfoInternal{FileInfoFields: fi}, nil
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}
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// List returns a list of the objects that are direct descendants of the given
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// path.
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func (d *driver) List(ctx context.Context, path string) ([]string, error) {
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d.mutex.RLock()
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defer d.mutex.RUnlock()
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normalized := normalize(path)
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found := d.root.find(normalized)
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if !found.isdir() {
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return nil, fmt.Errorf("not a directory") // TODO(stevvooe): Need error type for this...
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}
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entries, err := found.(*dir).list(normalized)
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if err != nil {
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switch err {
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case errNotExists:
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return nil, storagedriver.PathNotFoundError{Path: path}
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case errIsNotDir:
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return nil, fmt.Errorf("not a directory")
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default:
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return nil, err
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}
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}
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return entries, nil
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}
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// Move moves an object stored at sourcePath to destPath, removing the original
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// object.
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func (d *driver) Move(ctx context.Context, sourcePath string, destPath string) error {
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d.mutex.Lock()
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defer d.mutex.Unlock()
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normalizedSrc, normalizedDst := normalize(sourcePath), normalize(destPath)
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err := d.root.move(normalizedSrc, normalizedDst)
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switch err {
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case errNotExists:
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return storagedriver.PathNotFoundError{Path: destPath}
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default:
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return err
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}
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}
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// Delete recursively deletes all objects stored at "path" and its subpaths.
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func (d *driver) Delete(ctx context.Context, path string) error {
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d.mutex.Lock()
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defer d.mutex.Unlock()
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normalized := normalize(path)
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err := d.root.delete(normalized)
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switch err {
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case errNotExists:
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return storagedriver.PathNotFoundError{Path: path}
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default:
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return err
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}
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}
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// URLFor returns a URL which may be used to retrieve the content stored at the given path.
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// May return an UnsupportedMethodErr in certain StorageDriver implementations.
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func (d *driver) URLFor(ctx context.Context, path string, options map[string]interface{}) (string, error) {
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return "", storagedriver.ErrUnsupportedMethod{}
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}
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