Law of Demeter Client.mu

client.go

@@ -42,7 +42,8 @@ type Client struct {
 	// An aggregate of stats over all connections. First in struct to ensure
 	// 64-bit alignment of fields. See #262.
 	stats ConnStats
-	mu     sync.RWMutex
+
+	_mu    sync.RWMutex
 	event  sync.Cond
 	closed missinggo.Event
 
@@ -71,8 +72,8 @@ type Client struct {
 type ipStr string
 
 func (cl *Client) BadPeerIPs() []string {
-	cl.mu.RLock()
+	cl.rLock()
-	defer cl.mu.RUnlock()
+	defer cl.rUnlock()
 	return cl.badPeerIPsLocked()
 }
 
@@ -117,8 +118,8 @@ func writeDhtServerStatus(w io.Writer, s *dht.Server) {
 // Writes out a human readable status of the client, such as for writing to a
 // HTTP status page.
 func (cl *Client) WriteStatus(_w io.Writer) {
-	cl.mu.RLock()
+	cl.rLock()
-	defer cl.mu.RUnlock()
+	defer cl.rUnlock()
 	w := bufio.NewWriter(_w)
 	defer w.Flush()
 	fmt.Fprintf(w, "Listen port: %d\n", cl.LocalPort())
@@ -193,7 +194,7 @@ func NewClient(cfg *ClientConfig) (cl *Client, err error) {
 		cl.Close()
 	}()
 	cl.extensionBytes = defaultPeerExtensionBytes()
-	cl.event.L = &cl.mu
+	cl.event.L = cl.locker()
 	storageImpl := cfg.DefaultStorage
 	if storageImpl == nil {
 		// We'd use mmap but HFS+ doesn't support sparse files.
@@ -291,8 +292,8 @@ func firstNonEmptyString(ss ...string) string {
 }
 
 func (cl *Client) Closed() <-chan struct{} {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	return cl.closed.C()
 }
 
@@ -313,8 +314,8 @@ func (cl *Client) closeSockets() {
 // Stops the client. All connections to peers are closed and all activity will
 // come to a halt.
 func (cl *Client) Close() {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	cl.closed.Set()
 	cl.eachDhtServer(func(s *dht.Server) { s.Close() })
 	cl.closeSockets()
@@ -375,13 +376,13 @@ func (cl *Client) acceptConnections(l net.Listener) {
 	for {
 		conn, err := l.Accept()
 		conn = pproffd.WrapNetConn(conn)
-		cl.mu.RLock()
+		cl.rLock()
 		closed := cl.closed.IsSet()
 		reject := false
 		if conn != nil {
 			reject = cl.rejectAccepted(conn)
 		}
-		cl.mu.RUnlock()
+		cl.rUnlock()
 		if closed {
 			if conn != nil {
 				conn.Close()
@@ -418,8 +419,8 @@ func (cl *Client) incomingConnection(nc net.Conn) {
 
 // Returns a handle to the given torrent, if it's present in the client.
 func (cl *Client) Torrent(ih metainfo.Hash) (t *Torrent, ok bool) {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	t, ok = cl.torrents[ih]
 	return
 }
@@ -513,8 +514,8 @@ func (cl *Client) dialFirst(ctx context.Context, addr string) net.Conn {
 		}()
 	}
 	func() {
-		cl.mu.Lock()
+		cl.lock()
-		defer cl.mu.Unlock()
+		defer cl.unlock()
 		cl.eachListener(func(s socket) bool {
 			if peerNetworkEnabled(s.Addr().Network(), cl.config) {
 				dial(s.dial)
@@ -594,8 +595,8 @@ func (cl *Client) establishOutgoingConnEx(t *Torrent, addr string, ctx context.C
 // for valid reasons.
 func (cl *Client) establishOutgoingConn(t *Torrent, addr string) (c *connection, err error) {
 	ctx, cancel := context.WithTimeout(context.Background(), func() time.Duration {
-		cl.mu.RLock()
+		cl.rLock()
-		defer cl.mu.RUnlock()
+		defer cl.rUnlock()
 		return t.dialTimeout()
 	}())
 	defer cancel()
@@ -628,8 +629,8 @@ func (cl *Client) establishOutgoingConn(t *Torrent, addr string) (c *connection,
 // considered half-open.
 func (cl *Client) outgoingConnection(t *Torrent, addr string, ps peerSource) {
 	c, err := cl.establishOutgoingConn(t, addr)
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	// Don't release lock between here and addConnection, unless it's for
 	// failure.
 	cl.noLongerHalfOpen(t, addr)
@@ -688,8 +689,8 @@ func (cl *Client) initiateHandshakes(c *connection, t *Torrent) (ok bool, err er
 
 // Calls f with any secret keys.
 func (cl *Client) forSkeys(f func([]byte) bool) {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	for ih := range cl.torrents {
 		if !f(ih[:]) {
 			break
@@ -721,9 +722,9 @@ func (cl *Client) receiveHandshakes(c *connection) (t *Torrent, err error) {
 	if !ok {
 		return
 	}
-	cl.mu.Lock()
+	cl.lock()
 	t = cl.torrents[ih]
-	cl.mu.Unlock()
+	cl.unlock()
 	return
 }
 
@@ -755,21 +756,21 @@ func (cl *Client) runReceivedConn(c *connection) {
 			"network", c.remoteAddr().Network(),
 		).Log(cl.logger)
 		torrent.Add("error receiving handshake", 1)
-		cl.mu.Lock()
+		cl.lock()
 		cl.onBadAccept(c.remoteAddr())
-		cl.mu.Unlock()
+		cl.unlock()
 		return
 	}
 	if t == nil {
 		torrent.Add("received handshake for unloaded torrent", 1)
-		cl.mu.Lock()
+		cl.lock()
 		cl.onBadAccept(c.remoteAddr())
-		cl.mu.Unlock()
+		cl.unlock()
 		return
 	}
 	torrent.Add("received handshake for loaded torrent", 1)
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	cl.runHandshookConn(c, t)
 }
 
@@ -958,7 +959,7 @@ func (cl *Client) newTorrent(ih metainfo.Hash, specStorage storage.ClientImpl) (
 		networkingEnabled: true,
 		requestStrategy:   3,
 		metadataChanged: sync.Cond{
-			L: &cl.mu,
+			L: cl.locker(),
 		},
 		duplicateRequestTimeout: 1 * time.Second,
 	}
@@ -983,8 +984,8 @@ func (cl *Client) AddTorrentInfoHash(infoHash metainfo.Hash) (t *Torrent, new bo
 // If the torrent already exists then this Storage is ignored and the
 // existing torrent returned with `new` set to `false`
 func (cl *Client) AddTorrentInfoHashWithStorage(infoHash metainfo.Hash, specStorage storage.ClientImpl) (t *Torrent, new bool) {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	t, ok := cl.torrents[infoHash]
 	if ok {
 		return
@@ -1020,8 +1021,8 @@ func (cl *Client) AddTorrentSpec(spec *TorrentSpec) (t *Torrent, new bool, err e
 			return
 		}
 	}
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	if spec.ChunkSize != 0 {
 		t.setChunkSize(pp.Integer(spec.ChunkSize))
 	}
@@ -1059,8 +1060,8 @@ func (cl *Client) allTorrentsCompleted() bool {
 // Returns true when all torrents are completely downloaded and false if the
 // client is stopped before that.
 func (cl *Client) WaitAll() bool {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	for !cl.allTorrentsCompleted() {
 		if cl.closed.IsSet() {
 			return false
@@ -1072,8 +1073,8 @@ func (cl *Client) WaitAll() bool {
 
 // Returns handles to all the torrents loaded in the Client.
 func (cl *Client) Torrents() []*Torrent {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	return cl.torrentsAsSlice()
 }
 
@@ -1149,7 +1150,7 @@ func (cl *Client) newConnection(nc net.Conn, outgoing bool) (c *connection) {
 		PeerMaxRequests: 250,
 		writeBuffer:     new(bytes.Buffer),
 	}
-	c.writerCond.L = &cl.mu
+	c.writerCond.L = cl.locker()
 	c.setRW(connStatsReadWriter{nc, c})
 	c.r = &rateLimitedReader{
 		l: cl.config.DownloadRateLimiter,
@@ -1159,8 +1160,8 @@ func (cl *Client) newConnection(nc net.Conn, outgoing bool) (c *connection) {
 }
 
 func (cl *Client) onDHTAnnouncePeer(ih metainfo.Hash, p dht.Peer) {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	t := cl.torrent(ih)
 	if t == nil {
 		return
@@ -1224,8 +1225,8 @@ func (cl *Client) publicAddr(peer net.IP) ipPort {
 }
 
 func (cl *Client) ListenAddrs() (ret []net.Addr) {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	cl.eachListener(func(l socket) bool {
 		ret = append(ret, l.Addr())
 		return true
@@ -1255,12 +1256,12 @@ func (cl *Client) clearAcceptLimits() {
 func (cl *Client) acceptLimitClearer() {
 	for {
 		select {
-		case <-cl.closed.LockedChan(&cl.mu):
+		case <-cl.closed.LockedChan(cl.locker()):
 			return
 		case <-time.After(15 * time.Minute):
-			cl.mu.Lock()
+			cl.lock()
 			cl.clearAcceptLimits()
-			cl.mu.Unlock()
+			cl.unlock()
 		}
 	}
 }
@@ -1271,3 +1272,35 @@ func (cl *Client) rateLimitAccept(ip net.IP) bool {
 	}
 	return cl.acceptLimiter[ipStr(maskIpForAcceptLimiting(ip).String())] > 0
 }
+
+func (cl *Client) rLock() {
+	cl._mu.RLock()
+}
+
+func (cl *Client) rUnlock() {
+	cl._mu.RUnlock()
+}
+
+func (cl *Client) lock() {
+	cl._mu.Lock()
+}
+
+func (cl *Client) unlock() {
+	cl._mu.Unlock()
+}
+
+func (cl *Client) locker() sync.Locker {
+	return clientLocker{cl}
+}
+
+type clientLocker struct {
+	*Client
+}
+
+func (cl clientLocker) Lock() {
+	cl.lock()
+}
+
+func (cl clientLocker) Unlock() {
+	cl.unlock()
+}

client_test.go

@@ -112,15 +112,15 @@ func TestTorrentInitialState(t *testing.T) {
 		storage.NewFileWithCompletion(tempDir(), storage.NewMapPieceCompletion()),
 	)
 	tor.setChunkSize(2)
-	tor.cl.mu.Lock()
+	tor.cl.lock()
 	err := tor.setInfoBytes(mi.InfoBytes)
-	tor.cl.mu.Unlock()
+	tor.cl.unlock()
 	require.NoError(t, err)
 	require.Len(t, tor.pieces, 3)
 	tor.pendAllChunkSpecs(0)
-	tor.cl.mu.Lock()
+	tor.cl.lock()
 	assert.EqualValues(t, 3, tor.pieceNumPendingChunks(0))
-	tor.cl.mu.Unlock()
+	tor.cl.unlock()
 	assert.EqualValues(t, chunkSpec{4, 1}, chunkIndexSpec(2, tor.pieceLength(0), tor.chunkSize))
 }
 
@@ -782,12 +782,12 @@ func testDownloadCancel(t *testing.T, ps testDownloadCancelParams) {
 	psc := leecherGreeting.SubscribePieceStateChanges()
 	defer psc.Close()
 
-	leecherGreeting.cl.mu.Lock()
+	leecherGreeting.cl.lock()
 	leecherGreeting.downloadPiecesLocked(0, leecherGreeting.numPieces())
 	if ps.Cancel {
 		leecherGreeting.cancelPiecesLocked(0, leecherGreeting.NumPieces())
 	}
-	leecherGreeting.cl.mu.Unlock()
+	leecherGreeting.cl.unlock()
 	done := make(chan struct{})
 	defer close(done)
 	go leecherGreeting.AddClientPeer(seeder)
@@ -909,9 +909,9 @@ func TestClientDynamicListenPortNoProtocols(t *testing.T) {
 
 func totalConns(tts []*Torrent) (ret int) {
 	for _, tt := range tts {
-		tt.cl.mu.Lock()
+		tt.cl.lock()
 		ret += len(tt.conns)
-		tt.cl.mu.Unlock()
+		tt.cl.unlock()
 	}
 	return
 }

connection.go

@@ -177,7 +177,7 @@ func (cn *connection) peerHasAllPieces() (all bool, known bool) {
 }
 
 func (cn *connection) mu() sync.Locker {
-	return &cn.t.cl.mu
+	return cn.t.cl.locker()
 }
 
 func (cn *connection) remoteAddr() net.Addr {
@@ -1084,8 +1084,8 @@ func (c *connection) mainReadLoop() (err error) {
 	for {
 		var msg pp.Message
 		func() {
-			cl.mu.Unlock()
+			cl.unlock()
-			defer cl.mu.Lock()
+			defer cl.lock()
 			err = decoder.Decode(&msg)
 		}()
 		if t.closed.IsSet() || c.closed.IsSet() || err == io.EOF {
@@ -1324,8 +1324,8 @@ func (c *connection) receiveChunk(msg *pp.Message) error {
 	}
 
 	err := func() error {
-		cl.mu.Unlock()
+		cl.unlock()
-		defer cl.mu.Lock()
+		defer cl.lock()
 		// Write the chunk out. Note that the upper bound on chunk writing
 		// concurrency will be the number of connections. We write inline with
 		// receiving the chunk (with this lock dance), because we want to

connection_test.go

@@ -114,7 +114,7 @@ func BenchmarkConnectionMainReadLoop(b *testing.B) {
 		Piece: make([]byte, defaultChunkSize),
 	}
 	go func() {
-		cl.mu.Lock()
+		cl.lock()
 		err := cn.mainReadLoop()
 		if err != nil {
 			mrlErr <- err
@@ -127,12 +127,12 @@ func BenchmarkConnectionMainReadLoop(b *testing.B) {
 		defer w.Close()
 		ts.writeSem.Lock()
 		for range iter.N(b.N) {
-			cl.mu.Lock()
+			cl.lock()
 			// The chunk must be written to storage everytime, to ensure the
 			// writeSem is unlocked.
 			t.pieces[0].dirtyChunks.Clear()
 			cn.validReceiveChunks = map[request]struct{}{newRequestFromMessage(&msg): struct{}{}}
-			cl.mu.Unlock()
+			cl.unlock()
 			n, err := w.Write(wb)
 			require.NoError(b, err)
 			require.EqualValues(b, len(wb), n)

file.go

@@ -59,8 +59,8 @@ type FilePieceState struct {
 
 // Returns the state of pieces in this file.
 func (f *File) State() (ret []FilePieceState) {
-	f.t.cl.mu.RLock()
+	f.t.cl.rLock()
-	defer f.t.cl.mu.RUnlock()
+	defer f.t.cl.rUnlock()
 	pieceSize := int64(f.t.usualPieceSize())
 	off := f.offset % pieceSize
 	remaining := f.length
@@ -102,7 +102,7 @@ func (f *File) Cancel() {
 
 func (f *File) NewReader() Reader {
 	tr := reader{
-		mu:        &f.t.cl.mu,
+		mu:        f.t.cl.locker(),
 		t:         f.t,
 		readahead: 5 * 1024 * 1024,
 		offset:    f.Offset(),
@@ -114,8 +114,8 @@ func (f *File) NewReader() Reader {
 
 // Sets the minimum priority for pieces in the File.
 func (f *File) SetPriority(prio piecePriority) {
-	f.t.cl.mu.Lock()
+	f.t.cl.lock()
-	defer f.t.cl.mu.Unlock()
+	defer f.t.cl.unlock()
 	if prio == f.prio {
 		return
 	}
@@ -125,8 +125,8 @@ func (f *File) SetPriority(prio piecePriority) {
 
 // Returns the priority per File.SetPriority.
 func (f *File) Priority() piecePriority {
-	f.t.cl.mu.Lock()
+	f.t.cl.lock()
-	defer f.t.cl.mu.Unlock()
+	defer f.t.cl.unlock()
 	return f.prio
 }
 

piece.go

@@ -180,8 +180,8 @@ func (p *Piece) bytesLeft() (ret pp.Integer) {
 }
 
 func (p *Piece) VerifyData() {
-	p.t.cl.mu.Lock()
+	p.t.cl.lock()
-	defer p.t.cl.mu.Unlock()
+	defer p.t.cl.unlock()
 	target := p.numVerifies + 1
 	if p.hashing {
 		target++
@@ -208,8 +208,8 @@ func (p *Piece) torrentEndOffset() int64 {
 }
 
 func (p *Piece) SetPriority(prio piecePriority) {
-	p.t.cl.mu.Lock()
+	p.t.cl.lock()
-	defer p.t.cl.mu.Unlock()
+	defer p.t.cl.unlock()
 	p.priority = prio
 	p.t.updatePiecePriority(p.index)
 }

portfwd.go

@@ -20,20 +20,20 @@ func addPortMapping(d upnp.Device, proto upnp.Protocol, internalPort int, debug
 }
 
 func (cl *Client) forwardPort() {
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	if cl.config.NoDefaultPortForwarding {
 		return
 	}
-	cl.mu.Unlock()
+	cl.unlock()
 	ds := upnp.Discover(0, 2*time.Second)
-	cl.mu.Lock()
+	cl.lock()
 	flog.Default.Handle(flog.Fmsg("discovered %d upnp devices", len(ds)))
 	port := cl.incomingPeerPort()
-	cl.mu.Unlock()
+	cl.unlock()
 	for _, d := range ds {
 		go addPortMapping(d, upnp.TCP, port, cl.config.Debug)
 		go addPortMapping(d, upnp.UDP, port, cl.config.Debug)
 	}
-	cl.mu.Lock()
+	cl.lock()
 }

reader.go

@@ -69,8 +69,8 @@ func (r *reader) SetReadahead(readahead int64) {
 	r.mu.Lock()
 	r.readahead = readahead
 	r.mu.Unlock()
-	r.t.cl.mu.Lock()
+	r.t.cl.lock()
-	defer r.t.cl.mu.Unlock()
+	defer r.t.cl.unlock()
 	r.posChanged()
 }
 
@@ -146,10 +146,10 @@ func (r *reader) ReadContext(ctx context.Context, b []byte) (n int, err error) {
 		defer cancel()
 		go func() {
 			<-ctx.Done()
-			r.t.cl.mu.Lock()
+			r.t.cl.lock()
 			ctxErr = ctx.Err()
 			r.t.tickleReaders()
-			r.t.cl.mu.Unlock()
+			r.t.cl.unlock()
 		}()
 	}
 	// Hmmm, if a Read gets stuck, this means you can't change position for
@@ -183,8 +183,8 @@ func (r *reader) ReadContext(ctx context.Context, b []byte) (n int, err error) {
 // Wait until some data should be available to read. Tickles the client if it
 // isn't. Returns how much should be readable without blocking.
 func (r *reader) waitAvailable(pos, wanted int64, ctxErr *error) (avail int64) {
-	r.t.cl.mu.Lock()
+	r.t.cl.lock()
-	defer r.t.cl.mu.Unlock()
+	defer r.t.cl.unlock()
 	for !r.readable(pos) && *ctxErr == nil {
 		r.waitReadable(pos)
 	}
@@ -222,19 +222,19 @@ func (r *reader) readOnceAt(b []byte, pos int64, ctxErr *error) (n int, err erro
 			err = nil
 			return
 		}
-		r.t.cl.mu.Lock()
+		r.t.cl.lock()
 		// TODO: Just reset pieces in the readahead window. This might help
 		// prevent thrashing with small caches and file and piece priorities.
 		log.Printf("error reading torrent %q piece %d offset %d, %d bytes: %s", r.t, pi, po, len(b1), err)
 		r.t.updateAllPieceCompletions()
 		r.t.updateAllPiecePriorities()
-		r.t.cl.mu.Unlock()
+		r.t.cl.unlock()
 	}
 }
 
 func (r *reader) Close() error {
-	r.t.cl.mu.Lock()
+	r.t.cl.lock()
-	defer r.t.cl.mu.Unlock()
+	defer r.t.cl.unlock()
 	r.t.deleteReader(r)
 	return nil
 }

t.go

@@ -17,15 +17,15 @@ func (t *Torrent) InfoHash() metainfo.Hash {
 // Returns a channel that is closed when the info (.Info()) for the torrent
 // has become available.
 func (t *Torrent) GotInfo() <-chan struct{} {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.gotMetainfo.C()
 }
 
 // Returns the metainfo info dictionary, or nil if it's not yet available.
 func (t *Torrent) Info() *metainfo.Info {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.info
 }
 
@@ -33,7 +33,7 @@ func (t *Torrent) Info() *metainfo.Info {
 // the data requested is actually available.
 func (t *Torrent) NewReader() Reader {
 	r := reader{
-		mu:        &t.cl.mu,
+		mu:        t.cl.locker(),
 		t:         t,
 		readahead: 5 * 1024 * 1024,
 		length:    *t.length,
@@ -46,14 +46,14 @@ func (t *Torrent) NewReader() Reader {
 // same state. The sum of the state run lengths is the number of pieces
 // in the torrent.
 func (t *Torrent) PieceStateRuns() []PieceStateRun {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.pieceStateRuns()
 }
 
 func (t *Torrent) PieceState(piece pieceIndex) PieceState {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.pieceState(piece)
 }
 
@@ -65,8 +65,8 @@ func (t *Torrent) NumPieces() pieceIndex {
 
 // Get missing bytes count for specific piece.
 func (t *Torrent) PieceBytesMissing(piece int) int64 {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 
 	return int64(t.pieces[piece].bytesLeft())
 }
@@ -75,9 +75,9 @@ func (t *Torrent) PieceBytesMissing(piece int) int64 {
 // this. No data corruption can, or should occur to either the torrent's data,
 // or connected peers.
 func (t *Torrent) Drop() {
-	t.cl.mu.Lock()
+	t.cl.lock()
 	t.cl.dropTorrent(t.infoHash)
-	t.cl.mu.Unlock()
+	t.cl.unlock()
 }
 
 // Number of bytes of the entire torrent we have completed. This is the sum of
@@ -85,8 +85,8 @@ func (t *Torrent) Drop() {
 // for download rate, as it can go down when pieces are lost or fail checks.
 // Sample Torrent.Stats.DataBytesRead for actual file data download rate.
 func (t *Torrent) BytesCompleted() int64 {
-	t.cl.mu.RLock()
+	t.cl.rLock()
-	defer t.cl.mu.RUnlock()
+	defer t.cl.rUnlock()
 	return t.bytesCompleted()
 }
 
@@ -99,24 +99,24 @@ func (t *Torrent) SubscribePieceStateChanges() *pubsub.Subscription {
 // Returns true if the torrent is currently being seeded. This occurs when the
 // client is willing to upload without wanting anything in return.
 func (t *Torrent) Seeding() bool {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.seeding()
 }
 
 // Clobbers the torrent display name. The display name is used as the torrent
 // name if the metainfo is not available.
 func (t *Torrent) SetDisplayName(dn string) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	t.setDisplayName(dn)
 }
 
 // The current working name for the torrent. Either the name in the info dict,
 // or a display name given such as by the dn value in a magnet link, or "".
 func (t *Torrent) Name() string {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.name()
 }
 
@@ -129,14 +129,14 @@ func (t *Torrent) Length() int64 {
 // Returns a run-time generated metainfo for the torrent that includes the
 // info bytes and announce-list as currently known to the client.
 func (t *Torrent) Metainfo() metainfo.MetaInfo {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.newMetaInfo()
 }
 
 func (t *Torrent) addReader(r *reader) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	if t.readers == nil {
 		t.readers = make(map[*reader]struct{})
 	}
@@ -153,8 +153,8 @@ func (t *Torrent) deleteReader(r *reader) {
 // priority. Piece indexes are not the same as bytes. Requires that the info
 // has been obtained, see Torrent.Info and Torrent.GotInfo.
 func (t *Torrent) DownloadPieces(begin, end pieceIndex) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	t.downloadPiecesLocked(begin, end)
 }
 
@@ -167,8 +167,8 @@ func (t *Torrent) downloadPiecesLocked(begin, end pieceIndex) {
 }
 
 func (t *Torrent) CancelPieces(begin, end pieceIndex) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	t.cancelPiecesLocked(begin, end)
 }
 
@@ -208,8 +208,8 @@ func (t *Torrent) Files() []*File {
 
 func (t *Torrent) AddPeers(pp []Peer) {
 	cl := t.cl
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	t.addPeers(pp)
 }
 
@@ -228,13 +228,13 @@ func (t *Torrent) String() string {
 }
 
 func (t *Torrent) AddTrackers(announceList [][]string) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	t.addTrackers(announceList)
 }
 
 func (t *Torrent) Piece(i pieceIndex) *Piece {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return &t.pieces[i]
 }

torrent.go

@@ -155,7 +155,7 @@ func (t *Torrent) tickleReaders() {
 
 // Returns a channel that is closed when the Torrent is closed.
 func (t *Torrent) Closed() <-chan struct{} {
-	return t.closed.LockedChan(&t.cl.mu)
+	return t.closed.LockedChan(t.cl.locker())
 }
 
 // KnownSwarm returns the known subset of the peers in the Torrent's swarm, including active,
@@ -640,8 +640,8 @@ func (t *Torrent) newMetaInfo() metainfo.MetaInfo {
 }
 
 func (t *Torrent) BytesMissing() int64 {
-	t.mu().RLock()
+	t.cl.rLock()
-	defer t.mu().RUnlock()
+	defer t.cl.rUnlock()
 	return t.bytesMissingLocked()
 }
 
@@ -1210,8 +1210,8 @@ func (t *Torrent) bytesCompleted() int64 {
 }
 
 func (t *Torrent) SetInfoBytes(b []byte) (err error) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	return t.setInfoBytes(b)
 }
 
@@ -1388,14 +1388,14 @@ func (t *Torrent) consumeDHTAnnounce(pvs <-chan dht.PeersValues) {
 				}).String()
 				allAddrs[key] = struct{}{}
 			}
-			cl.mu.Lock()
+			cl.lock()
 			t.addPeers(addPeers)
 			numPeers := t.peers.Len()
-			cl.mu.Unlock()
+			cl.unlock()
 			if numPeers >= cl.config.TorrentPeersHighWater {
 				return
 			}
-		case <-t.closed.LockedChan(&cl.mu):
+		case <-t.closed.LockedChan(cl.locker()):
 			return
 		}
 	}
@@ -1416,14 +1416,14 @@ func (t *Torrent) dhtAnnouncer(s *dht.Server) {
 	cl := t.cl
 	for {
 		select {
-		case <-t.wantPeersEvent.LockedChan(&cl.mu):
+		case <-t.wantPeersEvent.LockedChan(cl.locker()):
-		case <-t.closed.LockedChan(&cl.mu):
+		case <-t.closed.LockedChan(cl.locker()):
 			return
 		}
 		err := t.announceDHT(true, s)
 		func() {
-			cl.mu.Lock()
+			cl.lock()
-			defer cl.mu.Unlock()
+			defer cl.unlock()
 			if err == nil {
 				t.numDHTAnnounces++
 			} else {
@@ -1431,7 +1431,7 @@ func (t *Torrent) dhtAnnouncer(s *dht.Server) {
 			}
 		}()
 		select {
-		case <-t.closed.LockedChan(&cl.mu):
+		case <-t.closed.LockedChan(cl.locker()):
 			return
 		case <-time.After(5 * time.Minute):
 		}
@@ -1445,8 +1445,8 @@ func (t *Torrent) addPeers(peers []Peer) {
 }
 
 func (t *Torrent) Stats() TorrentStats {
-	t.cl.mu.RLock()
+	t.cl.rLock()
-	defer t.cl.mu.RUnlock()
+	defer t.cl.rUnlock()
 	return t.statsLocked()
 }
 
@@ -1561,8 +1561,8 @@ func (t *Torrent) wantConns() bool {
 }
 
 func (t *Torrent) SetMaxEstablishedConns(max int) (oldMax int) {
-	t.cl.mu.Lock()
+	t.cl.lock()
-	defer t.cl.mu.Unlock()
+	defer t.cl.unlock()
 	oldMax = t.maxEstablishedConns
 	t.maxEstablishedConns = max
 	wcs := slices.HeapInterface(slices.FromMapKeys(t.conns), worseConn)
@@ -1573,10 +1573,6 @@ func (t *Torrent) SetMaxEstablishedConns(max int) (oldMax int) {
 	return oldMax
 }
 
-func (t *Torrent) mu() missinggo.RWLocker {
-	return &t.cl.mu
-}
-
 func (t *Torrent) pieceHashed(piece pieceIndex, correct bool) {
 	log.Fmsg("hashed piece %d", piece).Add("piece", piece).Add("passed", correct).AddValue(debugLogValue).Log(t.logger)
 	if t.closed.IsSet() {
@@ -1679,8 +1675,8 @@ func (t *Torrent) onIncompletePiece(piece pieceIndex) {
 
 func (t *Torrent) verifyPiece(piece pieceIndex) {
 	cl := t.cl
-	cl.mu.Lock()
+	cl.lock()
-	defer cl.mu.Unlock()
+	defer cl.unlock()
 	p := &t.pieces[piece]
 	defer func() {
 		p.numVerifies++
@@ -1700,10 +1696,10 @@ func (t *Torrent) verifyPiece(piece pieceIndex) {
 	t.publishPieceChange(piece)
 	t.updatePiecePriority(piece)
 	t.storageLock.RLock()
-	cl.mu.Unlock()
+	cl.unlock()
 	sum := t.hashPiece(piece)
 	t.storageLock.RUnlock()
-	cl.mu.Lock()
+	cl.lock()
 	p.hashing = false
 	t.updatePiecePriority(piece)
 	t.pieceHashed(piece, sum == p.hash)

torrent_test.go

@@ -154,13 +154,13 @@ func TestPieceHashFailed(t *testing.T) {
 	tt := cl.newTorrent(mi.HashInfoBytes(), badStorage{})
 	tt.setChunkSize(2)
 	require.NoError(t, tt.setInfoBytes(mi.InfoBytes))
-	tt.cl.mu.Lock()
+	tt.cl.lock()
 	tt.pieces[1].dirtyChunks.AddRange(0, 3)
 	require.True(t, tt.pieceAllDirty(1))
 	tt.pieceHashed(1, false)
 	// Dirty chunks should be cleared so we can try again.
 	require.False(t, tt.pieceAllDirty(1))
-	tt.cl.mu.Unlock()
+	tt.cl.unlock()
 }
 
 // Check the behaviour of Torrent.Metainfo when metadata is not completed.
@@ -194,8 +194,8 @@ func TestTorrentMetainfoIncompleteMetadata(t *testing.T) {
 	assert.EqualValues(t, 0, tt.metadataSize())
 
 	func() {
-		cl.mu.Lock()
+		cl.lock()
-		defer cl.mu.Unlock()
+		defer cl.unlock()
 		go func() {
 			_, err = nc.Write(pp.Message{
 				Type:       pp.Extended,

tracker_scraper.go

@@ -107,9 +107,9 @@ func (me *trackerScraper) announce() (ret trackerAnnounceResult) {
 		ret.Err = fmt.Errorf("error getting ip: %s", err)
 		return
 	}
-	me.t.cl.mu.Lock()
+	me.t.cl.lock()
 	req := me.t.announceRequest()
-	me.t.cl.mu.Unlock()
+	me.t.cl.unlock()
 	res, err := tracker.Announce{
 		HttpClient: me.t.cl.config.TrackerHttpClient,
 		UserAgent:  me.t.cl.config.HTTPUserAgent,
@@ -133,24 +133,24 @@ func (me *trackerScraper) announce() (ret trackerAnnounceResult) {
 func (me *trackerScraper) Run() {
 	for {
 		select {
-		case <-me.t.closed.LockedChan(&me.t.cl.mu):
+		case <-me.t.closed.LockedChan(me.t.cl.locker()):
 			return
-		case <-me.stop.LockedChan(&me.t.cl.mu):
+		case <-me.stop.LockedChan(me.t.cl.locker()):
 			return
-		case <-me.t.wantPeersEvent.LockedChan(&me.t.cl.mu):
+		case <-me.t.wantPeersEvent.LockedChan(me.t.cl.locker()):
 		}
 
 		ar := me.announce()
-		me.t.cl.mu.Lock()
+		me.t.cl.lock()
 		me.lastAnnounce = ar
-		me.t.cl.mu.Unlock()
+		me.t.cl.unlock()
 
 		intervalChan := time.After(time.Until(ar.Completed.Add(ar.Interval)))
 
 		select {
-		case <-me.t.closed.LockedChan(&me.t.cl.mu):
+		case <-me.t.closed.LockedChan(me.t.cl.locker()):
 			return
-		case <-me.stop.LockedChan(&me.t.cl.mu):
+		case <-me.stop.LockedChan(me.t.cl.locker()):
 			return
 		case <-intervalChan:
 		}