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local_driver.go
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local_driver.go
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/*
* Copyright 2020 The Dragonfly Authors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package local
import (
"fmt"
"io"
"os"
"path/filepath"
"d7y.io/dragonfly/v2/cdn/storedriver"
logger "d7y.io/dragonfly/v2/internal/dflog"
"d7y.io/dragonfly/v2/pkg/synclock"
"d7y.io/dragonfly/v2/pkg/unit"
"d7y.io/dragonfly/v2/pkg/util/fileutils"
"d7y.io/dragonfly/v2/pkg/util/statutils"
)
// Ensure driver implements the storedriver.Driver interface
var _ storedriver.Driver = (*driver)(nil)
const (
DiskDriverName = "disk"
MemoryDriverName = "memory"
)
var fileLocker = synclock.NewLockerPool()
func init() {
storedriver.Register(DiskDriverName, NewStorageDriver)
storedriver.Register(MemoryDriverName, NewStorageDriver)
if err := storedriver.RegisterPlugin(DiskDriverName, NewStorageDriver); err != nil {
logger.CoreLogger.Error(err)
}
if err := storedriver.RegisterPlugin(MemoryDriverName, NewStorageDriver); err != nil {
logger.CoreLogger.Error(err)
}
}
// driver is one of the implementations of storage Driver using local file system.
type driver struct {
// BaseDir is the dir that local storage driver will store content based on it.
BaseDir string
}
// NewStorageDriver performs initialization for disk Storage and return a storage Driver.
func NewStorageDriver(cfg *storedriver.Config) (storedriver.Driver, error) {
// prepare the base dir
if !filepath.IsAbs(cfg.BaseDir) {
return nil, fmt.Errorf("not absolute path: %s", cfg.BaseDir)
}
if err := fileutils.MkdirAll(cfg.BaseDir); err != nil {
return nil, fmt.Errorf("create baseDir %s: %v", cfg.BaseDir, err)
}
return &driver{
BaseDir: cfg.BaseDir,
}, nil
}
func (ds *driver) GetTotalSpace() (unit.Bytes, error) {
path := ds.BaseDir
lock(path, -1, true)
defer unLock(path, -1, true)
return fileutils.GetTotalSpace(path)
}
func (ds *driver) GetBaseDir() string {
return ds.BaseDir
}
func (ds *driver) CreateBaseDir() error {
return os.MkdirAll(ds.BaseDir, os.ModePerm)
}
func (ds *driver) MoveFile(src string, dst string) error {
return fileutils.MoveFile(src, dst)
}
// Get the content of key from storage and return in io stream.
func (ds *driver) Get(raw *storedriver.Raw) (io.ReadCloser, error) {
path, info, err := ds.statPath(raw.Bucket, raw.Key)
if err != nil {
return nil, err
}
if err := storedriver.CheckGetRaw(raw, info.Size()); err != nil {
return nil, err
}
r, w := io.Pipe()
go func(w *io.PipeWriter) {
defer w.Close()
lock(path, raw.Offset, true)
defer unLock(path, raw.Offset, true)
f, err := os.Open(path)
if err != nil {
return
}
defer func() {
if err := f.Close(); err != nil {
logger.Error("close file %s: %v", f, err)
}
}()
if _, err := f.Seek(raw.Offset, io.SeekStart); err != nil {
logger.Errorf("seek file %s: %v", f, err)
}
var reader io.Reader
reader = f
if raw.Length > 0 {
reader = io.LimitReader(f, raw.Length)
}
buf := make([]byte, 256*1024)
if _, err := io.CopyBuffer(w, reader, buf); err != nil {
logger.Errorf("copy buffer from file %s: %v", f, err)
}
}(w)
return r, nil
}
// GetBytes gets the content of key from storage and return in bytes.
func (ds *driver) GetBytes(raw *storedriver.Raw) (data []byte, err error) {
path, info, err := ds.statPath(raw.Bucket, raw.Key)
if err != nil {
return nil, err
}
if err := storedriver.CheckGetRaw(raw, info.Size()); err != nil {
return nil, err
}
lock(path, raw.Offset, true)
defer unLock(path, raw.Offset, true)
f, err := os.Open(path)
if err != nil {
return nil, err
}
defer func() {
if err := f.Close(); err != nil {
logger.Errorf("failed to close file %s: %v", f, err)
}
}()
if _, err := f.Seek(raw.Offset, io.SeekStart); err != nil {
return nil, err
}
if raw.Length == 0 {
data, err = io.ReadAll(f)
} else {
data = make([]byte, raw.Length)
_, err = f.Read(data)
}
if err != nil {
return nil, err
}
return data, nil
}
// Put reads the content from reader and put it into storage.
func (ds *driver) Put(raw *storedriver.Raw, data io.Reader) error {
if err := storedriver.CheckPutRaw(raw); err != nil {
return err
}
path, err := ds.preparePath(raw.Bucket, raw.Key)
if err != nil {
return err
}
if data == nil {
return nil
}
lock(path, raw.Offset, false)
defer unLock(path, raw.Offset, false)
var f *os.File
if raw.Trunc {
if err = storedriver.CheckTrunc(raw); err != nil {
return err
}
if f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644); err != nil {
return err
}
} else if raw.Append {
if f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644); err != nil {
return err
}
} else {
if f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0644); err != nil {
return err
}
}
defer func() {
if err := f.Close(); err != nil {
logger.Errorf("failed to close file %s: %v", f, err)
}
}()
if raw.Trunc {
if err = f.Truncate(raw.TruncSize); err != nil {
return err
}
}
if _, err := f.Seek(raw.Offset, io.SeekStart); err != nil {
return err
}
if raw.Length > 0 {
if _, err = io.CopyN(f, data, raw.Length); err != nil {
return err
}
return nil
}
buf := make([]byte, 256*1024)
if _, err = io.CopyBuffer(f, data, buf); err != nil {
return err
}
return nil
}
// PutBytes puts the content of key from storage with bytes.
func (ds *driver) PutBytes(raw *storedriver.Raw, data []byte) error {
if err := storedriver.CheckPutRaw(raw); err != nil {
return err
}
path, err := ds.preparePath(raw.Bucket, raw.Key)
if err != nil {
return err
}
lock(path, raw.Offset, false)
defer unLock(path, raw.Offset, false)
var f *os.File
if raw.Trunc {
f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_TRUNC|os.O_CREATE, 0644)
} else if raw.Append {
f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0644)
} else {
f, err = fileutils.OpenFile(path, os.O_WRONLY|os.O_CREATE, 0644)
}
if err != nil {
return err
}
defer func() {
if err := f.Close(); err != nil {
logger.Errorf("failed to close file %s: %v", f, err)
}
}()
if raw.Trunc {
if err = f.Truncate(raw.TruncSize); err != nil {
return err
}
}
if _, err := f.Seek(raw.Offset, io.SeekStart); err != nil {
return err
}
if raw.Length > 0 {
if _, err := f.Write(data[:raw.Length]); err != nil {
return err
}
return nil
}
if _, err := f.Write(data); err != nil {
return err
}
return nil
}
// Stat determines whether the file exists.
func (ds *driver) Stat(raw *storedriver.Raw) (*storedriver.StorageInfo, error) {
_, fileInfo, err := ds.statPath(raw.Bucket, raw.Key)
if err != nil {
return nil, err
}
return &storedriver.StorageInfo{
Path: filepath.Join(raw.Bucket, raw.Key),
Size: fileInfo.Size(),
CreateTime: statutils.Ctime(fileInfo),
ModTime: fileInfo.ModTime(),
}, nil
}
// Exits if filepath exists, include symbol link
func (ds *driver) Exits(raw *storedriver.Raw) bool {
filePath := filepath.Join(ds.BaseDir, raw.Bucket, raw.Key)
return fileutils.PathExist(filePath)
}
// Remove delete a file or dir.
// It will force delete the file or dir when the raw.Trunc is true.
func (ds *driver) Remove(raw *storedriver.Raw) error {
path, info, err := ds.statPath(raw.Bucket, raw.Key)
if err != nil {
return err
}
lock(path, -1, false)
defer unLock(path, -1, false)
if raw.Trunc || !info.IsDir() {
return os.RemoveAll(path)
}
empty, err := fileutils.IsEmptyDir(path)
if empty {
return os.RemoveAll(path)
}
return err
}
// GetFreeSpace returns the available disk space in Byte.
func (ds *driver) GetFreeSpace() (unit.Bytes, error) {
path := ds.BaseDir
lock(path, -1, true)
defer unLock(path, -1, true)
return fileutils.GetFreeSpace(path)
}
func (ds *driver) GetTotalAndFreeSpace() (unit.Bytes, unit.Bytes, error) {
path := ds.BaseDir
lock(path, -1, true)
defer unLock(path, -1, true)
return fileutils.GetTotalAndFreeSpace(path)
}
// Walk walks the file tree rooted at root which determined by raw.Bucket and raw.Key,
// calling walkFn for each file or directory in the tree, including root.
func (ds *driver) Walk(raw *storedriver.Raw) error {
path, _, err := ds.statPath(raw.Bucket, raw.Key)
if err != nil {
return err
}
lock(path, -1, true)
defer unLock(path, -1, true)
return filepath.Walk(path, raw.WalkFn)
}
func (ds *driver) GetPath(raw *storedriver.Raw) string {
return filepath.Join(ds.BaseDir, raw.Bucket, raw.Key)
}
// helper function
// preparePath gets the target path and creates the upper directory if it does not exist.
func (ds *driver) preparePath(bucket, key string) (string, error) {
dir := filepath.Join(ds.BaseDir, bucket)
if err := fileutils.MkdirAll(dir); err != nil {
return "", err
}
target := filepath.Join(dir, key)
return target, nil
}
// statPath determines whether the target file exists and returns an fileMutex if so.
func (ds *driver) statPath(bucket, key string) (string, os.FileInfo, error) {
filePath := filepath.Join(ds.BaseDir, bucket, key)
f, err := os.Stat(filePath)
if err != nil {
return "", nil, err
}
return filePath, f, nil
}
func lock(path string, offset int64, ro bool) {
if offset != -1 {
fileLocker.Lock(LockKey(path, -1), true)
}
fileLocker.Lock(LockKey(path, offset), ro)
}
func unLock(path string, offset int64, ro bool) {
if offset != -1 {
fileLocker.UnLock(LockKey(path, -1), true)
}
fileLocker.UnLock(LockKey(path, offset), ro)
}
func LockKey(path string, offset int64) string {
return fmt.Sprintf("%s:%d", path, offset)
}