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piece_resource.go
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/
piece_resource.go
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package storage
import (
"path"
"github.com/anacrolix/missinggo/resource"
"github.com/anacrolix/torrent/metainfo"
)
type piecePerResource struct {
p resource.Provider
}
func NewResourcePieces(p resource.Provider) ClientImpl {
return &piecePerResource{
p: p,
}
}
func (s *piecePerResource) OpenTorrent(info *metainfo.Info, infoHash metainfo.Hash) (TorrentImpl, error) {
return s, nil
}
func (s *piecePerResource) Close() error {
return nil
}
func (s *piecePerResource) Piece(p metainfo.Piece) PieceImpl {
completed, err := s.p.NewInstance(path.Join("completed", p.Hash().HexString()))
if err != nil {
panic(err)
}
incomplete, err := s.p.NewInstance(path.Join("incomplete", p.Hash().HexString()))
if err != nil {
panic(err)
}
return piecePerResourcePiece{
p: p,
c: completed,
i: incomplete,
}
}
type piecePerResourcePiece struct {
p metainfo.Piece
c resource.Instance
i resource.Instance
}
func (s piecePerResourcePiece) GetIsComplete() bool {
fi, err := s.c.Stat()
return err == nil && fi.Size() == s.p.Length()
}
func (s piecePerResourcePiece) MarkComplete() error {
return resource.Move(s.i, s.c)
}
func (s piecePerResourcePiece) MarkNotComplete() error {
return s.c.Delete()
}
func (s piecePerResourcePiece) ReadAt(b []byte, off int64) (int, error) {
if s.GetIsComplete() {
return s.c.ReadAt(b, off)
} else {
return s.i.ReadAt(b, off)
}
}
func (s piecePerResourcePiece) WriteAt(b []byte, off int64) (n int, err error) {
return s.i.WriteAt(b, off)
}