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package backend
import (
"github.com/seaweedfs/seaweedfs/weed/util/log"
. "github.com/seaweedfs/seaweedfs/weed/storage/types"
"io"
"os"
"runtime"
"time"
)
var (
_ BackendStorageFile = &DiskFile{}
)
const isMac = runtime.GOOS == "darwin"
type DiskFile struct {
File *os.File
fullFilePath string
fileSize int64
modTime time.Time
}
func NewDiskFile(f *os.File) *DiskFile {
stat, err := f.Stat()
if err != nil {
log.Fatalf("stat file %s: %v", f.Name(), err)
}
offset := stat.Size()
if offset%NeedlePaddingSize != 0 {
offset = offset + (NeedlePaddingSize - offset%NeedlePaddingSize)
}
return &DiskFile{
fullFilePath: f.Name(),
File: f,
fileSize: offset,
modTime: stat.ModTime(),
}
}
func (df *DiskFile) ReadAt(p []byte, off int64) (n int, err error) {
if df.File == nil {
return 0, os.ErrClosed
}
n, err = df.File.ReadAt(p, off)
if err == io.EOF && n == len(p) {
err = nil
}
return
}
func (df *DiskFile) WriteAt(p []byte, off int64) (n int, err error) {
if df.File == nil {
return 0, os.ErrClosed
}
n, err = df.File.WriteAt(p, off)
if err == nil {
waterMark := off + int64(n)
if waterMark > df.fileSize {
df.fileSize = waterMark
df.modTime = time.Now()
}
}
return
}
func (df *DiskFile) Write(p []byte) (n int, err error) {
return df.WriteAt(p, df.fileSize)
}
func (df *DiskFile) Truncate(off int64) error {
if df.File == nil {
return os.ErrClosed
}
err := df.File.Truncate(off)
if err == nil {
df.fileSize = off
df.modTime = time.Now()
}
return err
}
func (df *DiskFile) Close() error {
if df.File == nil {
return nil
}
err := df.Sync()
var err1 error
if df.File != nil {
// always try to close
err1 = df.File.Close()
}
// assume closed
df.File = nil
if err != nil {
return err
}
if err1 != nil {
return err1
}
return nil
}
func (df *DiskFile) GetStat() (datSize int64, modTime time.Time, err error) {
if df.File == nil {
err = os.ErrClosed
}
return df.fileSize, df.modTime, err
}
func (df *DiskFile) Name() string {
return df.fullFilePath
}
func (df *DiskFile) Sync() error {
if df.File == nil {
return os.ErrClosed
}
if isMac {
return nil
}
return df.File.Sync()
}
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