feat: Waku v2 bridge

Issue #12610

vendor/github.com/pion/turn/v2/server.go

@@ -0,0 +1,187 @@
+// Package turn contains the public API for pion/turn, a toolkit for building TURN clients and servers
+package turn
+
+import (
+	"fmt"
+	"net"
+	"sync"
+	"time"
+
+	"github.com/pion/logging"
+	"github.com/pion/turn/v2/internal/allocation"
+	"github.com/pion/turn/v2/internal/proto"
+	"github.com/pion/turn/v2/internal/server"
+)
+
+const (
+	defaultInboundMTU = 1600
+)
+
+// Server is an instance of the Pion TURN Server
+type Server struct {
+	log                logging.LeveledLogger
+	authHandler        AuthHandler
+	realm              string
+	channelBindTimeout time.Duration
+	nonces             *sync.Map
+
+	packetConnConfigs  []PacketConnConfig
+	listenerConfigs    []ListenerConfig
+	allocationManagers []*allocation.Manager
+
+	inboundMTU int
+}
+
+// NewServer creates the Pion TURN server
+func NewServer(config ServerConfig) (*Server, error) {
+	if err := config.validate(); err != nil {
+		return nil, err
+	}
+
+	loggerFactory := config.LoggerFactory
+	if loggerFactory == nil {
+		loggerFactory = logging.NewDefaultLoggerFactory()
+	}
+
+	mtu := defaultInboundMTU
+	if config.InboundMTU != 0 {
+		mtu = config.InboundMTU
+	}
+
+	s := &Server{
+		log:                loggerFactory.NewLogger("turn"),
+		authHandler:        config.AuthHandler,
+		realm:              config.Realm,
+		channelBindTimeout: config.ChannelBindTimeout,
+		packetConnConfigs:  config.PacketConnConfigs,
+		listenerConfigs:    config.ListenerConfigs,
+		allocationManagers: make([]*allocation.Manager, len(config.PacketConnConfigs)+len(config.ListenerConfigs)),
+		nonces:             &sync.Map{},
+		inboundMTU:         mtu,
+	}
+
+	if s.channelBindTimeout == 0 {
+		s.channelBindTimeout = proto.DefaultLifetime
+	}
+
+	for i := range s.packetConnConfigs {
+		go func(i int, p PacketConnConfig) {
+			allocationManager, err := allocation.NewManager(allocation.ManagerConfig{
+				AllocatePacketConn: p.RelayAddressGenerator.AllocatePacketConn,
+				AllocateConn:       p.RelayAddressGenerator.AllocateConn,
+				LeveledLogger:      s.log,
+			})
+			if err != nil {
+				s.log.Errorf("exit read loop on error: %s", err.Error())
+				return
+			}
+			s.allocationManagers[i] = allocationManager
+			defer func() {
+				if err := allocationManager.Close(); err != nil {
+					s.log.Errorf("Failed to close AllocationManager: %s", err.Error())
+				}
+			}()
+
+			s.readLoop(p.PacketConn, allocationManager)
+		}(i, s.packetConnConfigs[i])
+	}
+
+	for i, listener := range s.listenerConfigs {
+		go func(i int, l ListenerConfig) {
+			allocationManager, err := allocation.NewManager(allocation.ManagerConfig{
+				AllocatePacketConn: l.RelayAddressGenerator.AllocatePacketConn,
+				AllocateConn:       l.RelayAddressGenerator.AllocateConn,
+				LeveledLogger:      s.log,
+			})
+			if err != nil {
+				s.log.Errorf("exit read loop on error: %s", err.Error())
+				return
+			}
+			s.allocationManagers[i] = allocationManager
+			defer func() {
+				if err := allocationManager.Close(); err != nil {
+					s.log.Errorf("Failed to close AllocationManager: %s", err.Error())
+				}
+			}()
+
+			for {
+				conn, err := l.Listener.Accept()
+				if err != nil {
+					s.log.Debugf("exit accept loop on error: %s", err.Error())
+					return
+				}
+
+				go s.readLoop(NewSTUNConn(conn), allocationManager)
+			}
+		}(i+len(s.packetConnConfigs), listener)
+	}
+
+	return s, nil
+}
+
+// AllocationCount returns the number of active allocations. It can be used to drain the server before closing
+func (s *Server) AllocationCount() int {
+	allocations := 0
+	for _, manager := range s.allocationManagers {
+		if manager != nil {
+			allocations += manager.AllocationCount()
+		}
+	}
+	return allocations
+}
+
+// Close stops the TURN Server. It cleans up any associated state and closes all connections it is managing
+func (s *Server) Close() error {
+	var errors []error
+
+	for _, p := range s.packetConnConfigs {
+		if err := p.PacketConn.Close(); err != nil {
+			errors = append(errors, err)
+		}
+	}
+
+	for _, l := range s.listenerConfigs {
+		if err := l.Listener.Close(); err != nil {
+			errors = append(errors, err)
+		}
+	}
+
+	if len(errors) == 0 {
+		return nil
+	}
+
+	err := errFailedToClose
+	for _, e := range errors {
+		err = fmt.Errorf("%s; Close error (%v) ", err.Error(), e) //nolint:goerr113
+	}
+
+	return err
+}
+
+func (s *Server) readLoop(p net.PacketConn, allocationManager *allocation.Manager) {
+	buf := make([]byte, s.inboundMTU)
+	for {
+		n, addr, err := p.ReadFrom(buf)
+		switch {
+		case err != nil:
+			s.log.Debugf("exit read loop on error: %s", err.Error())
+			return
+		case n >= s.inboundMTU:
+			s.log.Debugf("Read bytes exceeded MTU, packet is possibly truncated")
+		}
+
+		if err := server.HandleRequest(server.Request{
+			Conn:               p,
+			SrcAddr:            addr,
+			Buff:               buf[:n],
+			Log:                s.log,
+			AuthHandler:        s.authHandler,
+			Realm:              s.realm,
+			AllocationManager:  allocationManager,
+			ChannelBindTimeout: s.channelBindTimeout,
+			Nonces:             s.nonces,
+		}); err != nil {
+			s.log.Errorf("error when handling datagram: %v", err)
+		}
+	}
+}