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backend.go
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/
backend.go
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package fileCacheDataBackend
import (
"io"
"os"
"github.com/anacrolix/missinggo/filecache"
"github.com/anacrolix/torrent/data/pieceStore/dataBackend"
)
type backend struct {
c *filecache.Cache
}
func New(fc *filecache.Cache) *backend {
return &backend{
c: fc,
}
}
var _ dataBackend.I = &backend{}
func (me *backend) Delete(path string) (err error) {
err = me.c.Remove(path)
return
}
func (me *backend) GetLength(path string) (ret int64, err error) {
f, err := me.c.OpenFile(path, 0)
if os.IsNotExist(err) {
err = dataBackend.ErrNotFound
}
if err != nil {
return
}
defer f.Close()
ret, err = f.Seek(0, os.SEEK_END)
return
}
func (me *backend) Open(path string, flag int) (ret dataBackend.File, err error) {
ret, err = me.c.OpenFile(path, flag)
return
}
func (me *backend) OpenSection(path string, off, n int64) (ret io.ReadCloser, err error) {
f, err := me.c.OpenFile(path, os.O_RDONLY)
if os.IsNotExist(err) {
err = dataBackend.ErrNotFound
}
if err != nil {
return
}
ret = struct {
io.Reader
io.Closer
}{
io.NewSectionReader(f, off, n),
f,
}
return
}