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fs.go
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fs.go
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/*
* Copyright (c) 2021 Baidu, Inc. All Rights Reserved.
*
* 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 fs
import (
"crypto/md5"
"encoding/hex"
"io"
"io/ioutil"
"os"
)
type FileSystem interface {
Stat(name string) (os.FileInfo, error)
ReadFile(name string) ([]byte, error)
WriteFile(name string, data []byte, perm os.FileMode) error
Open(name string) (*os.File, error)
Rename(oldpath string, newpath string) error
Remove(name string) error
MD5Sum(name string) (string, error)
}
var _ FileSystem = &DefaultFS{}
// DefaultFS implements FileSystem using the local disk
type DefaultFS struct{}
func (DefaultFS) Stat(name string) (os.FileInfo, error) {
return os.Stat(name)
}
func (DefaultFS) ReadFile(name string) ([]byte, error) {
return ioutil.ReadFile(name)
}
func (DefaultFS) WriteFile(name string, data []byte, perm os.FileMode) error {
return ioutil.WriteFile(name, data, perm)
}
func (DefaultFS) Open(name string) (*os.File, error) {
return os.Open(name)
}
func (DefaultFS) Rename(oldpath string, newpath string) error {
return os.Rename(oldpath, newpath)
}
func (DefaultFS) Remove(name string) error {
return os.Remove(name)
}
func (DefaultFS) MD5Sum(name string) (string, error) {
f, err := os.Open(name)
if err != nil {
return "", err
}
defer f.Close()
h := md5.New()
if _, err := io.Copy(h, f); err != nil {
return "", err
}
return hex.EncodeToString(h.Sum(nil)), nil
}