108 lines
2.8 KiB
Go
108 lines
2.8 KiB
Go
package quic
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import (
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"bytes"
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"fmt"
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"net"
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"sync"
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"github.com/lucas-clemente/quic-go/internal/utils"
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"github.com/lucas-clemente/quic-go/logging"
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)
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var (
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connMuxerOnce sync.Once
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connMuxer multiplexer
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)
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type indexableConn interface {
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LocalAddr() net.Addr
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}
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type multiplexer interface {
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AddConn(c net.PacketConn, connIDLen int, statelessResetKey []byte, tracer logging.Tracer) (packetHandlerManager, error)
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RemoveConn(indexableConn) error
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}
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type connManager struct {
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connIDLen int
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statelessResetKey []byte
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tracer logging.Tracer
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manager packetHandlerManager
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}
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// The connMultiplexer listens on multiple net.PacketConns and dispatches
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// incoming packets to the connection handler.
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type connMultiplexer struct {
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mutex sync.Mutex
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conns map[string] /* LocalAddr().String() */ connManager
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newPacketHandlerManager func(net.PacketConn, int, []byte, logging.Tracer, utils.Logger) (packetHandlerManager, error) // so it can be replaced in the tests
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logger utils.Logger
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}
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var _ multiplexer = &connMultiplexer{}
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func getMultiplexer() multiplexer {
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connMuxerOnce.Do(func() {
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connMuxer = &connMultiplexer{
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conns: make(map[string]connManager),
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logger: utils.DefaultLogger.WithPrefix("muxer"),
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newPacketHandlerManager: newPacketHandlerMap,
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}
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})
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return connMuxer
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}
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func (m *connMultiplexer) AddConn(
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c net.PacketConn,
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connIDLen int,
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statelessResetKey []byte,
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tracer logging.Tracer,
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) (packetHandlerManager, error) {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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addr := c.LocalAddr()
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connIndex := addr.Network() + " " + addr.String()
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p, ok := m.conns[connIndex]
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if !ok {
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manager, err := m.newPacketHandlerManager(c, connIDLen, statelessResetKey, tracer, m.logger)
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if err != nil {
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return nil, err
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}
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p = connManager{
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connIDLen: connIDLen,
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statelessResetKey: statelessResetKey,
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manager: manager,
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tracer: tracer,
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}
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m.conns[connIndex] = p
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} else {
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if p.connIDLen != connIDLen {
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return nil, fmt.Errorf("cannot use %d byte connection IDs on a connection that is already using %d byte connction IDs", connIDLen, p.connIDLen)
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}
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if statelessResetKey != nil && !bytes.Equal(p.statelessResetKey, statelessResetKey) {
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return nil, fmt.Errorf("cannot use different stateless reset keys on the same packet conn")
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}
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if tracer != p.tracer {
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return nil, fmt.Errorf("cannot use different tracers on the same packet conn")
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}
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}
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return p.manager, nil
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}
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func (m *connMultiplexer) RemoveConn(c indexableConn) error {
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m.mutex.Lock()
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defer m.mutex.Unlock()
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connIndex := c.LocalAddr().Network() + " " + c.LocalAddr().String()
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if _, ok := m.conns[connIndex]; !ok {
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return fmt.Errorf("cannote remove connection, connection is unknown")
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}
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delete(m.conns, connIndex)
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return nil
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}
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