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// 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 (
inboundMTU = 1500
)
// 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
}
// 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()
}
s := &Server{
log: loggerFactory.NewLogger("turn"),
authHandler: config.AuthHandler,
realm: config.Realm,
channelBindTimeout: config.ChannelBindTimeout,
packetConnConfigs: config.PacketConnConfigs,
listenerConfigs: config.ListenerConfigs,
nonces: &sync.Map{},
}
if s.channelBindTimeout == 0 {
s.channelBindTimeout = proto.DefaultLifetime
}
for i := range s.packetConnConfigs {
go func(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
}
defer func() {
if err := allocationManager.Close(); err != nil {
s.log.Errorf("Failed to close AllocationManager: %s", err.Error())
}
}()
s.readLoop(p.PacketConn, allocationManager)
}(s.packetConnConfigs[i])
}
for _, listener := range s.listenerConfigs {
go func(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
}
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)
}
}(listener)
}
return s, nil
}
// 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, inboundMTU)
for {
n, addr, err := p.ReadFrom(buf)
if err != nil {
s.log.Debugf("exit read loop on error: %s", err.Error())
return
}
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)
}
}
}
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