153 lines
2.5 KiB
Go
153 lines
2.5 KiB
Go
package fs
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import (
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"context"
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"io"
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"sync"
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"time"
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"github.com/anacrolix/torrent"
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)
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var _ Filesystem = &Torrent{}
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type Torrent struct {
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mu sync.RWMutex
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ts map[string]*torrent.Torrent
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s *storage
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loaded bool
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readTimeout int
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}
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func NewTorrent(readTimeout int) *Torrent {
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return &Torrent{
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s: newStorage(SupportedFactories),
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ts: make(map[string]*torrent.Torrent),
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readTimeout: readTimeout,
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}
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}
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func (fs *Torrent) AddTorrent(t *torrent.Torrent) {
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fs.mu.Lock()
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defer fs.mu.Unlock()
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fs.loaded = false
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fs.ts[t.InfoHash().HexString()] = t
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}
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func (fs *Torrent) RemoveTorrent(h string) {
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fs.mu.Lock()
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defer fs.mu.Unlock()
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fs.s.Clear()
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fs.loaded = false
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delete(fs.ts, h)
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}
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func (fs *Torrent) load() {
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if fs.loaded {
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return
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}
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fs.mu.RLock()
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defer fs.mu.RUnlock()
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for _, t := range fs.ts {
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<-t.GotInfo()
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for _, file := range t.Files() {
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fs.s.Add(&torrentFile{
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reader: file.NewReader(),
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len: file.Length(),
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timeout: fs.readTimeout,
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}, file.Path())
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}
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}
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fs.loaded = true
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}
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func (fs *Torrent) Open(filename string) (File, error) {
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fs.load()
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return fs.s.Get(filename)
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}
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func (fs *Torrent) ReadDir(path string) (map[string]File, error) {
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fs.load()
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return fs.s.Children(path)
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}
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var _ File = &torrentFile{}
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type torrentFile struct {
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mu sync.Mutex
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reader torrent.Reader
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len int64
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timeout int
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}
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func (d *torrentFile) Size() int64 {
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return d.len
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}
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func (d *torrentFile) IsDir() bool {
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return false
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}
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func (d *torrentFile) Close() error {
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return d.reader.Close()
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}
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func (d *torrentFile) Read(p []byte) (n int, err error) {
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ctx, cancel := context.WithCancel(context.Background())
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timer := time.AfterFunc(
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time.Duration(d.timeout)*time.Second,
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func() {
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cancel()
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},
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)
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defer timer.Stop()
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return d.reader.ReadContext(ctx, p)
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}
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func (d *torrentFile) ReadAt(p []byte, off int64) (int, error) {
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d.mu.Lock()
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defer d.mu.Unlock()
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_, err := d.reader.Seek(off, io.SeekStart)
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if err != nil {
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return 0, err
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}
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i, err := d.readAtLeast(p, len(p))
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return i, err
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}
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func (d *torrentFile) readAtLeast(buf []byte, min int) (n int, err error) {
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if len(buf) < min {
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return 0, io.ErrShortBuffer
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}
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for n < min && err == nil {
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var nn int
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ctx, cancel := context.WithCancel(context.Background())
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timer := time.AfterFunc(
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time.Duration(d.timeout)*time.Second,
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func() {
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cancel()
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},
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)
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nn, err = d.reader.ReadContext(ctx, buf[n:])
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n += nn
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timer.Stop()
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}
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if n >= min {
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err = nil
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} else if n > 0 && err == io.EOF {
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err = io.ErrUnexpectedEOF
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}
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return
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}
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