99 lines
2 KiB
Go
99 lines
2 KiB
Go
package node
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import (
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"context"
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"io"
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"log"
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"math"
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"syscall"
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"github.com/ajnavarro/distribyted/iio"
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"github.com/hanwen/go-fuse/v2/fs"
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"github.com/hanwen/go-fuse/v2/fuse"
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)
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var _ fs.NodeGetattrer = &File{}
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var _ fs.NodeOpener = &File{}
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var _ fs.NodeReader = &File{}
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var _ fs.NodeFlusher = &File{}
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// File is a fuse node for files inside a torrent
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type File struct {
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fs.Inode
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f ReaderFunc
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r io.ReaderAt
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len int64
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pieceLen int32
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numPieces int64
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}
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func NewFile(readerFunc ReaderFunc, len int64) *File {
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return &File{
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f: readerFunc,
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len: len,
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}
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}
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func NewFileWithBlocks(readerFunc ReaderFunc, len int64, pieceLen int32, numPieces int64) *File {
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return &File{
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f: readerFunc,
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len: len,
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pieceLen: pieceLen,
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numPieces: numPieces,
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}
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}
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func (tr *File) Getattr(ctx context.Context, f fs.FileHandle, out *fuse.AttrOut) syscall.Errno {
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out.Mode = syscall.S_IFREG & 0555
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out.Nlink = 1
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out.Size = uint64(tr.len)
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if tr.pieceLen != 0 {
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out.Blksize = uint32(tr.pieceLen)
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out.Blocks = uint64(tr.numPieces)
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}
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return fs.OK
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}
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func (tr *File) Open(ctx context.Context, flags uint32) (fh fs.FileHandle, fuseFlags uint32, errno syscall.Errno) {
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if tr.r == nil {
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r, err := tr.f()
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if err != nil {
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log.Println("error opening reader for file", err)
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return nil, 0, syscall.EIO
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}
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tr.r = r
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}
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return nil, fuse.FOPEN_KEEP_CACHE, fs.OK
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}
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func (tr *File) Read(ctx context.Context, f fs.FileHandle, dest []byte, off int64) (fuse.ReadResult, syscall.Errno) {
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end := int(math.Min(float64(len(dest)), float64(int64(tr.len)-off)))
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if end < 0 {
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end = 0
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}
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buf := dest[:end]
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n, err := tr.r.ReadAt(buf, off)
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if err != nil && err != io.EOF {
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log.Println("error read data", err)
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return nil, syscall.EIO
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}
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buf = buf[:n]
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return fuse.ReadResultData(buf), fs.OK
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}
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func (tr *File) Flush(ctx context.Context, f fs.FileHandle) syscall.Errno {
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if err := iio.CloseIfCloseable(tr.r); err != nil {
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log.Println("error closing file", err)
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return syscall.EIO
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}
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return fs.OK
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}
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