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multiplexer.go
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multiplexer.go
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package quic
import (
"fmt"
"net"
"sync"
"v2ray.com/core/external/github.com/lucas-clemente/quic-go/internal/utils"
)
var (
connMuxerOnce sync.Once
connMuxer multiplexer
)
type multiplexer interface {
AddConn(net.PacketConn, int) (packetHandlerManager, error)
RemoveConn(net.PacketConn) error
}
type connManager struct {
connIDLen int
manager packetHandlerManager
}
// The connMultiplexer listens on multiple net.PacketConns and dispatches
// incoming packets to the session handler.
type connMultiplexer struct {
mutex sync.Mutex
conns map[net.PacketConn]connManager
newPacketHandlerManager func(net.PacketConn, int, utils.Logger) packetHandlerManager // so it can be replaced in the tests
logger utils.Logger
}
var _ multiplexer = &connMultiplexer{}
func getMultiplexer() multiplexer {
connMuxerOnce.Do(func() {
connMuxer = &connMultiplexer{
conns: make(map[net.PacketConn]connManager),
logger: utils.DefaultLogger.WithPrefix("muxer"),
newPacketHandlerManager: newPacketHandlerMap,
}
})
return connMuxer
}
func (m *connMultiplexer) AddConn(c net.PacketConn, connIDLen int) (packetHandlerManager, error) {
m.mutex.Lock()
defer m.mutex.Unlock()
p, ok := m.conns[c]
if !ok {
manager := m.newPacketHandlerManager(c, connIDLen, m.logger)
p = connManager{connIDLen: connIDLen, manager: manager}
m.conns[c] = p
}
if p.connIDLen != connIDLen {
return nil, fmt.Errorf("cannot use %d byte connection IDs on a connection that is already using %d byte connction IDs", connIDLen, p.connIDLen)
}
return p.manager, nil
}
func (m *connMultiplexer) RemoveConn(c net.PacketConn) error {
m.mutex.Lock()
defer m.mutex.Unlock()
if _, ok := m.conns[c]; !ok {
return fmt.Errorf("cannote remove connection, connection is unknown")
}
delete(m.conns, c)
return nil
}