Rename fake to listener

Fix thread handling

client/internal/conn_mgr.go

@@ -55,9 +55,15 @@ func (e *ConnMgr) Start(parentCtx context.Context) {
 	ctx, cancel := context.WithCancel(parentCtx)
 	e.ctxCancel = cancel
 
-	e.lazyConnMgr.Start(ctx)
-	e.wg.Add(1)
-	go e.receiveLazyConnEvents(ctx)
+	e.wg.Add(2)
+	go func() {
+		defer e.wg.Done()
+		e.lazyConnMgr.Start(ctx)
+	}()
+	go func() {
+		defer e.wg.Done()
+		e.receiveLazyConnEvents(ctx)
+	}()
 }
 
 func (e *ConnMgr) AddExcludeFromLazyConnection(peerID string) {
@@ -135,7 +141,6 @@ func (e *ConnMgr) Close() {
 }
 
 func (e *ConnMgr) receiveLazyConnEvents(ctx context.Context) {
-	defer e.wg.Done()
 	for {
 		select {
 		case <-ctx.Done():

client/internal/lazyconn/listener/listener.go

@@ -2,7 +2,6 @@ package listener
 
 import (
 	"net"
-	"sync"
 
 	log "github.com/sirupsen/logrus"
 )
@@ -11,8 +10,6 @@ type Listener struct {
 	peerID string
 
 	conn *net.UDPConn
-	// todo is not thread safe. If you start the ReadPackets in upper layer in a Go thread then wait for Close() there too
-	wg sync.WaitGroup
 }
 
 func NewListener(peerID string, conn *net.UDPConn) *Listener {
@@ -24,14 +21,11 @@ func NewListener(peerID string, conn *net.UDPConn) *Listener {
 }
 
 func (d *Listener) ReadPackets(trigger func(peerID string)) {
-	d.wg.Add(1)
-	defer d.wg.Done()
-
 	for {
 		buffer := make([]byte, 10)
 		n, remoteAddr, err := d.conn.ReadFromUDP(buffer)
 		if err != nil {
-			log.Infof("exit from fake peer reader: %v", err)
+			log.Infof("exit from peer listener reader: %v", err)
 			return
 		}
 
@@ -47,5 +41,4 @@ func (d *Listener) Close() {
 	if err := d.conn.Close(); err != nil {
 		log.Errorf("failed to close UDP listener: %s", err)
 	}
-	d.wg.Wait()
 }

client/internal/lazyconn/listener/manager.go

@@ -3,6 +3,7 @@ package listener
 import (
 	"fmt"
 	"net"
+	"sync"
 
 	log "github.com/sirupsen/logrus"
 
@@ -17,6 +18,7 @@ type Manager struct {
 	portGenerator *portAllocator
 	// todo peers add/remove is not thread safe because of the callback function
 	peers map[string]*Listener
+	wg    sync.WaitGroup
 	done  chan struct{}
 }
 
@@ -31,12 +33,12 @@ func NewManager(wgIface lazyconn.WGIface) *Manager {
 	return m
 }
 
-func (m *Manager) CreateFakePeer(peerCfg lazyconn.PeerConfig) error {
+func (m *Manager) CreatePeerListener(peerCfg lazyconn.PeerConfig) error {
 	if _, ok := m.peers[peerCfg.PublicKey]; ok {
 		return nil
 	}
 
-	if err := m.createFakePeer(peerCfg); err != nil {
+	if err := m.createPeerlistener(peerCfg); err != nil {
 		return err
 	}
 	log.Debugf("created lazy connection listener for: %s", peerCfg.PublicKey)
@@ -51,9 +53,7 @@ func (m *Manager) RemovePeer(peerID string) {
 
 	listener.Close()
 
-	if err := m.wgIface.RemovePeer(peerID); err != nil {
-		log.Warnf("failed to remove fake peer: %v", err)
-	}
+	m.removeEndpoint(peerID)
 
 	delete(m.peers, peerID)
 }
@@ -64,9 +64,10 @@ func (m *Manager) Close() {
 		listener.Close()
 		delete(m.peers, peerID)
 	}
+	m.wg.Wait()
 }
 
-func (m *Manager) createFakePeer(peerCfg lazyconn.PeerConfig) error {
+func (m *Manager) createPeerlistener(peerCfg lazyconn.PeerConfig) error {
 	conn, addr, err := m.portGenerator.newConn()
 	if err != nil {
 		return fmt.Errorf("failed to bind lazy connection: %v", err)
@@ -82,7 +83,11 @@ func (m *Manager) createFakePeer(peerCfg lazyconn.PeerConfig) error {
 
 	log.Infof("created on-demand listener: %s, for peer: %s", addr.String(), peerCfg.PublicKey)
 
-	go listener.ReadPackets(m.onTrigger)
+	m.wg.Add(1)
+	go func() {
+		defer m.wg.Done()
+		listener.ReadPackets(m.onTrigger)
+	}()
 
 	m.peers[peerCfg.PublicKey] = listener
 	return nil
@@ -91,10 +96,7 @@ func (m *Manager) createFakePeer(peerCfg lazyconn.PeerConfig) error {
 // todo: it is not thread safe, but it is ok if we protect from upper layer
 func (m *Manager) onTrigger(peerID string) {
 	log.Debugf("peer started to send traffic, remove lazy endpoint: %s", peerID)
-	if err := m.wgIface.RemovePeer(peerID); err != nil {
-		log.Warnf("failed to remove fake peer: %v", err)
-	}
-
+	m.removeEndpoint(peerID)
 	delete(m.peers, peerID)
 
 	select {
@@ -103,6 +105,12 @@ func (m *Manager) onTrigger(peerID string) {
 	}
 }
 
+func (m *Manager) removeEndpoint(peerID string) {
+	if err := m.wgIface.RemovePeer(peerID); err != nil {
+		log.Warnf("failed to remove peer listener: %v", err)
+	}
+}
+
 func (m *Manager) createEndpoint(peerCfg lazyconn.PeerConfig, endpoint *net.UDPAddr) error {
 	return m.wgIface.UpdatePeer(peerCfg.PublicKey, peerCfg.AllowedIPs, 0, endpoint, nil)
 }

client/internal/lazyconn/manager/manager.go

@@ -20,7 +20,6 @@ type Manager struct {
 	managedPeersMu sync.Mutex
 
 	ctxCancel context.CancelFunc
-	wg        sync.WaitGroup
 }
 
 func NewManager(wgIface lazyconn.WGIface) *Manager {
@@ -36,14 +35,7 @@ func NewManager(wgIface lazyconn.WGIface) *Manager {
 func (m *Manager) Start(parentCtx context.Context) {
 	ctx, cancel := context.WithCancel(parentCtx)
 	m.ctxCancel = cancel
-
-	m.wg.Add(1)
-
-	go func() {
-		defer m.wg.Done()
-		defer cancel()
-		m.receiveLazyConnEvents(ctx)
-	}()
+	m.receiveLazyConnEvents(ctx)
 }
 
 func (m *Manager) AddPeer(peer lazyconn.PeerConfig) error {
@@ -57,7 +49,7 @@ func (m *Manager) AddPeer(peer lazyconn.PeerConfig) error {
 		return nil
 	}
 
-	if err := m.listenerMgr.CreateFakePeer(peer); err != nil {
+	if err := m.listenerMgr.CreatePeerListener(peer); err != nil {
 		return err
 	}
 
@@ -89,7 +81,7 @@ func (m *Manager) Close() {
 	m.ctxCancel()
 
 	m.listenerMgr.Close()
-	m.wg.Wait()
+
 	m.managedPeers = make(map[string]lazyconn.PeerConfig)
 
 	// clean up the channel for the future reuse
@@ -102,18 +94,14 @@ func (m *Manager) receiveLazyConnEvents(ctx context.Context) {
 		case <-ctx.Done():
 			return
 		case peerID := <-m.listenerMgr.TrafficStartChan:
-			m.notifyPeerAction(ctx, peerID)
+			select {
+			case <-ctx.Done():
+			case m.PeerActivityChan <- peerID:
+			}
 		}
 	}
 }
 
-func (m *Manager) notifyPeerAction(ctx context.Context, peerID string) {
-	select {
-	case <-ctx.Done():
-	case m.PeerActivityChan <- peerID:
-	}
-}
-
 func (m *Manager) drainPeerActivityChan() {
 	for {
 		select {