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driver.go
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driver.go
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package filesystem
import (
"bytes"
"fmt"
"io"
"io/ioutil"
"os"
"path"
"time"
storagedriver "github.com/docker/distribution/registry/storage/driver"
"github.com/docker/distribution/registry/storage/driver/base"
"github.com/docker/distribution/registry/storage/driver/factory"
)
const driverName = "filesystem"
const defaultRootDirectory = "/tmp/registry/storage"
func init() {
factory.Register(driverName, &filesystemDriverFactory{})
}
// filesystemDriverFactory implements the factory.StorageDriverFactory interface
type filesystemDriverFactory struct{}
func (factory *filesystemDriverFactory) Create(parameters map[string]interface{}) (storagedriver.StorageDriver, error) {
return FromParameters(parameters), nil
}
type driver struct {
rootDirectory string
}
type baseEmbed struct {
base.Base
}
// Driver is a storagedriver.StorageDriver implementation backed by a local
// filesystem. All provided paths will be subpaths of the RootDirectory.
type Driver struct {
baseEmbed
}
// FromParameters constructs a new Driver with a given parameters map
// Optional Parameters:
// - rootdirectory
func FromParameters(parameters map[string]interface{}) *Driver {
var rootDirectory = defaultRootDirectory
if parameters != nil {
rootDir, ok := parameters["rootdirectory"]
if ok {
rootDirectory = fmt.Sprint(rootDir)
}
}
return New(rootDirectory)
}
// New constructs a new Driver with a given rootDirectory
func New(rootDirectory string) *Driver {
return &Driver{
baseEmbed: baseEmbed{
Base: base.Base{
StorageDriver: &driver{
rootDirectory: rootDirectory,
},
},
},
}
}
// Implement the storagedriver.StorageDriver interface
func (d *driver) Name() string {
return driverName
}
// GetContent retrieves the content stored at "path" as a []byte.
func (d *driver) GetContent(path string) ([]byte, error) {
rc, err := d.ReadStream(path, 0)
if err != nil {
return nil, err
}
defer rc.Close()
p, err := ioutil.ReadAll(rc)
if err != nil {
return nil, err
}
return p, nil
}
// PutContent stores the []byte content at a location designated by "path".
func (d *driver) PutContent(subPath string, contents []byte) error {
if _, err := d.WriteStream(subPath, 0, bytes.NewReader(contents)); err != nil {
return err
}
return os.Truncate(d.fullPath(subPath), int64(len(contents)))
}
// ReadStream retrieves an io.ReadCloser for the content stored at "path" with a
// given byte offset.
func (d *driver) ReadStream(path string, offset int64) (io.ReadCloser, error) {
file, err := os.OpenFile(d.fullPath(path), os.O_RDONLY, 0644)
if err != nil {
if os.IsNotExist(err) {
return nil, storagedriver.PathNotFoundError{Path: path}
}
return nil, err
}
seekPos, err := file.Seek(int64(offset), os.SEEK_SET)
if err != nil {
file.Close()
return nil, err
} else if seekPos < int64(offset) {
file.Close()
return nil, storagedriver.InvalidOffsetError{Path: path, Offset: offset}
}
return file, nil
}
// WriteStream stores the contents of the provided io.Reader at a location
// designated by the given path.
func (d *driver) WriteStream(subPath string, offset int64, reader io.Reader) (nn int64, err error) {
// TODO(stevvooe): This needs to be a requirement.
// if !path.IsAbs(subPath) {
// return fmt.Errorf("absolute path required: %q", subPath)
// }
fullPath := d.fullPath(subPath)
parentDir := path.Dir(fullPath)
if err := os.MkdirAll(parentDir, 0755); err != nil {
return 0, err
}
fp, err := os.OpenFile(fullPath, os.O_WRONLY|os.O_CREATE, 0644)
if err != nil {
// TODO(stevvooe): A few missing conditions in storage driver:
// 1. What if the path is already a directory?
// 2. Should number 1 be exposed explicitly in storagedriver?
// 2. Can this path not exist, even if we create above?
return 0, err
}
defer fp.Close()
nn, err = fp.Seek(offset, os.SEEK_SET)
if err != nil {
return 0, err
}
if nn != offset {
return 0, fmt.Errorf("bad seek to %v, expected %v in fp=%v", offset, nn, fp)
}
return io.Copy(fp, reader)
}
// Stat retrieves the FileInfo for the given path, including the current size
// in bytes and the creation time.
func (d *driver) Stat(subPath string) (storagedriver.FileInfo, error) {
fullPath := d.fullPath(subPath)
fi, err := os.Stat(fullPath)
if err != nil {
if os.IsNotExist(err) {
return nil, storagedriver.PathNotFoundError{Path: subPath}
}
return nil, err
}
return fileInfo{
path: subPath,
FileInfo: fi,
}, nil
}
// List returns a list of the objects that are direct descendants of the given
// path.
func (d *driver) List(subPath string) ([]string, error) {
if subPath[len(subPath)-1] != '/' {
subPath += "/"
}
fullPath := d.fullPath(subPath)
dir, err := os.Open(fullPath)
if err != nil {
if os.IsNotExist(err) {
return nil, storagedriver.PathNotFoundError{Path: subPath}
}
return nil, err
}
defer dir.Close()
fileNames, err := dir.Readdirnames(0)
if err != nil {
return nil, err
}
keys := make([]string, 0, len(fileNames))
for _, fileName := range fileNames {
keys = append(keys, path.Join(subPath, fileName))
}
return keys, nil
}
// Move moves an object stored at sourcePath to destPath, removing the original
// object.
func (d *driver) Move(sourcePath string, destPath string) error {
source := d.fullPath(sourcePath)
dest := d.fullPath(destPath)
if _, err := os.Stat(source); os.IsNotExist(err) {
return storagedriver.PathNotFoundError{Path: sourcePath}
}
if err := os.MkdirAll(path.Dir(dest), 0755); err != nil {
return err
}
err := os.Rename(source, dest)
return err
}
// Delete recursively deletes all objects stored at "path" and its subpaths.
func (d *driver) Delete(subPath string) error {
fullPath := d.fullPath(subPath)
_, err := os.Stat(fullPath)
if err != nil && !os.IsNotExist(err) {
return err
} else if err != nil {
return storagedriver.PathNotFoundError{Path: subPath}
}
err = os.RemoveAll(fullPath)
return err
}
// URLFor returns a URL which may be used to retrieve the content stored at the given path.
// May return an UnsupportedMethodErr in certain StorageDriver implementations.
func (d *driver) URLFor(path string, options map[string]interface{}) (string, error) {
return "", storagedriver.ErrUnsupportedMethod
}
// fullPath returns the absolute path of a key within the Driver's storage.
func (d *driver) fullPath(subPath string) string {
return path.Join(d.rootDirectory, subPath)
}
type fileInfo struct {
os.FileInfo
path string
}
var _ storagedriver.FileInfo = fileInfo{}
// Path provides the full path of the target of this file info.
func (fi fileInfo) Path() string {
return fi.path
}
// Size returns current length in bytes of the file. The return value can
// be used to write to the end of the file at path. The value is
// meaningless if IsDir returns true.
func (fi fileInfo) Size() int64 {
if fi.IsDir() {
return 0
}
return fi.FileInfo.Size()
}
// ModTime returns the modification time for the file. For backends that
// don't have a modification time, the creation time should be returned.
func (fi fileInfo) ModTime() time.Time {
return fi.FileInfo.ModTime()
}
// IsDir returns true if the path is a directory.
func (fi fileInfo) IsDir() bool {
return fi.FileInfo.IsDir()
}