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Signed-off-by: Starnop <starnop@163.com>
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/* | ||
* Copyright 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. | ||
*/ | ||
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package store | ||
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import ( | ||
"fmt" | ||
"io" | ||
"io/ioutil" | ||
"os" | ||
"path" | ||
"sync" | ||
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"github.com/dragonflyoss/Dragonfly/common/util" | ||
) | ||
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// LocalStorageDriver is a const of local storage driver. | ||
const LocalStorageDriver = "local" | ||
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func init() { | ||
Register(LocalStorageDriver, NewLocalStorage) | ||
} | ||
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type fileMutex struct { | ||
path string | ||
fileInfo os.FileInfo | ||
sync.RWMutex | ||
} | ||
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// LocalStorage is one of the implementions of StorageDriver by locally. | ||
type localStorage struct { | ||
baseDir string | ||
buckets map[string]string | ||
} | ||
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// NewLocalStorage performs initialization for LocalStorage and return a StorageDriver. | ||
func NewLocalStorage(config interface{}) (StorageDriver, error) { | ||
// type assertion for config | ||
cfg, ok := config.(*localStorage) | ||
if !ok { | ||
return nil, fmt.Errorf("failed to parse config") | ||
} | ||
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// prepare the base dir | ||
if !path.IsAbs(cfg.baseDir) { | ||
return nil, fmt.Errorf("not absolute path: %s", cfg.baseDir) | ||
} | ||
if err := util.CreateDirectory(cfg.baseDir); err != nil { | ||
return nil, err | ||
} | ||
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return &localStorage{ | ||
baseDir: cfg.baseDir, | ||
buckets: cfg.buckets, | ||
}, nil | ||
} | ||
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// Get the content of key from storage and return in io stream. | ||
func (lb *localStorage) Get(raw *Raw, writer io.Writer) error { | ||
file, err := lb.statPath(raw.bucket, raw.key) | ||
if err != nil { | ||
return err | ||
} | ||
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file.RLock() | ||
defer file.RUnlock() | ||
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f, err := os.Open(file.path) | ||
if err != nil { | ||
return err | ||
} | ||
defer f.Close() | ||
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f.Seek(raw.offset, 0) | ||
if raw.length <= 0 { | ||
_, err = io.Copy(writer, f) | ||
} else { | ||
_, err = io.CopyN(writer, f, raw.length) | ||
} | ||
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if err != nil { | ||
return err | ||
} | ||
return nil | ||
} | ||
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// GetBytes gets the content of key from storage and return in bytes. | ||
func (lb *localStorage) GetBytes(raw *Raw) (data []byte, err error) { | ||
file, err := lb.statPath(raw.bucket, raw.key) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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file.RLock() | ||
defer file.RUnlock() | ||
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f, err := os.Open(file.path) | ||
if err != nil { | ||
return nil, err | ||
} | ||
defer f.Close() | ||
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f.Seek(raw.offset, 0) | ||
if raw.length <= 0 { | ||
data, err = ioutil.ReadAll(f) | ||
} else { | ||
data = make([]byte, raw.length) | ||
_, err = f.Read(data) | ||
} | ||
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if err != nil { | ||
return nil, err | ||
} | ||
return data, nil | ||
} | ||
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// Put reads the content from reader and put it into storage. | ||
func (lb *localStorage) Put(raw *Raw, data io.Reader) error { | ||
file, err := lb.preparePath(raw.bucket, raw.key) | ||
if err != nil { | ||
return err | ||
} | ||
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file.Lock() | ||
defer file.Unlock() | ||
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f, err := os.OpenFile(file.path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC|os.O_SYNC, 0644) | ||
if err != nil { | ||
return err | ||
} | ||
defer f.Close() | ||
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f.Seek(raw.offset, 0) | ||
if _, err = io.Copy(f, data); err != nil { | ||
return err | ||
} | ||
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return nil | ||
} | ||
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// PutBytes puts the content of key from storage with bytes. | ||
func (lb *localStorage) PutBytes(raw *Raw, data []byte) error { | ||
file, err := lb.preparePath(raw.bucket, raw.key) | ||
if err != nil { | ||
return err | ||
} | ||
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file.Lock() | ||
defer file.Unlock() | ||
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f, err := os.OpenFile(file.path, os.O_WRONLY|os.O_CREATE|os.O_TRUNC|os.O_SYNC, 0644) | ||
if err != nil { | ||
return err | ||
} | ||
defer f.Close() | ||
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f.Seek(raw.offset, 0) | ||
if _, err := f.Write(data); err != nil { | ||
return err | ||
} | ||
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return nil | ||
} | ||
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// Stat determine whether the file exists. | ||
func (lb *localStorage) Stat(raw *Raw) (*StorageInfo, error) { | ||
file, err := lb.statPath(raw.bucket, raw.key) | ||
if err != nil { | ||
return nil, err | ||
} | ||
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return &StorageInfo{ | ||
Path: file.path, | ||
Size: file.fileInfo.Size(), | ||
ModTime: file.fileInfo.ModTime(), | ||
}, nil | ||
} | ||
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// Remove deletes a file or dir. | ||
func (lb *localStorage) Remove(raw *Raw) error { | ||
file, err := lb.statPath(raw.bucket, raw.key) | ||
if err != nil { | ||
return err | ||
} | ||
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file.Lock() | ||
defer file.Unlock() | ||
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if err := os.RemoveAll(file.path); err != nil { | ||
return err | ||
} | ||
return nil | ||
} | ||
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// helper function | ||
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// preparePath gets the target path and creates the upper directory if it does not exist. | ||
func (lb *localStorage) preparePath(bucket, key string) (*fileMutex, error) { | ||
dir := path.Join(lb.baseDir, key) | ||
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if err := util.CreateDirectory(dir); err != nil { | ||
return nil, err | ||
} | ||
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target := path.Join(dir, key+lb.buckets[bucket]) | ||
return &fileMutex{path: target}, nil | ||
} | ||
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// statPath determines whether the target file exists and returns an fileMutex if so. | ||
func (lb *localStorage) statPath(bucket, key string) (*fileMutex, error) { | ||
filePath := path.Join(lb.baseDir, key, key+lb.buckets[bucket]) | ||
f, err := os.Stat(filePath) | ||
if err != nil { | ||
if os.IsNotExist(err) { | ||
return nil, ErrNotFound | ||
} | ||
return nil, err | ||
} | ||
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return &fileMutex{ | ||
path: filePath, | ||
fileInfo: f, | ||
}, nil | ||
} |
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