mirror of
https://github.com/minio/minio.git
synced 2024-12-27 23:55:56 -05:00
100 lines
2.1 KiB
Go
100 lines
2.1 KiB
Go
package appendstorage
|
|
|
|
import (
|
|
"bytes"
|
|
"encoding/gob"
|
|
"io/ioutil"
|
|
"os"
|
|
"path"
|
|
"strconv"
|
|
|
|
"github.com/minio-io/minio/pkgs/storage"
|
|
)
|
|
|
|
type appendStorage struct {
|
|
RootDir string
|
|
file *os.File
|
|
objects map[string]Header
|
|
objectsFile string
|
|
}
|
|
|
|
type Header struct {
|
|
Path string
|
|
Offset int64
|
|
Length int
|
|
Crc []byte
|
|
}
|
|
|
|
func NewStorage(rootDir string, slice int) (storage.ObjectStorage, error) {
|
|
rootPath := path.Join(rootDir, strconv.Itoa(slice))
|
|
// TODO verify and fix partial writes
|
|
file, err := os.OpenFile(rootPath, os.O_APPEND|os.O_CREATE|os.O_RDWR, 0600)
|
|
if err != nil {
|
|
return &appendStorage{}, err
|
|
}
|
|
objectsFile := path.Join(rootDir, strconv.Itoa(slice)+".map")
|
|
objects := make(map[string]Header)
|
|
if _, err := os.Stat(objectsFile); err == nil {
|
|
mapFile, err := os.Open(objectsFile)
|
|
defer mapFile.Close()
|
|
if err != nil {
|
|
return &appendStorage{}, nil
|
|
}
|
|
dec := gob.NewDecoder(mapFile)
|
|
err = dec.Decode(&objects)
|
|
if err != nil {
|
|
return &appendStorage{}, nil
|
|
}
|
|
}
|
|
if err != nil {
|
|
return &appendStorage{}, err
|
|
}
|
|
return &appendStorage{
|
|
RootDir: rootDir,
|
|
file: file,
|
|
objects: objects,
|
|
objectsFile: objectsFile,
|
|
}, nil
|
|
}
|
|
|
|
func (storage *appendStorage) Get(objectPath string) ([]byte, error) {
|
|
header, ok := storage.objects[objectPath]
|
|
if ok == false {
|
|
return nil, nil
|
|
}
|
|
|
|
offset := header.Offset
|
|
length := header.Length
|
|
|
|
object := make([]byte, length)
|
|
_, err := storage.file.ReadAt(object, offset)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return object, nil
|
|
}
|
|
|
|
func (storage *appendStorage) Put(objectPath string, object []byte) error {
|
|
header := Header{
|
|
Path: objectPath,
|
|
Offset: 0,
|
|
Length: 0,
|
|
Crc: nil,
|
|
}
|
|
offset, err := storage.file.Seek(0, os.SEEK_END)
|
|
if err != nil {
|
|
return err
|
|
}
|
|
if _, err := storage.file.Write(object); err != nil {
|
|
return err
|
|
}
|
|
header.Offset = offset
|
|
header.Length = len(object)
|
|
storage.objects[objectPath] = header
|
|
var mapBuffer bytes.Buffer
|
|
encoder := gob.NewEncoder(&mapBuffer)
|
|
encoder.Encode(storage.objects)
|
|
ioutil.WriteFile(storage.objectsFile, mapBuffer.Bytes(), 0600)
|
|
return nil
|
|
}
|