139 lines
2.8 KiB
Go
139 lines
2.8 KiB
Go
package mtcp
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import (
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"context"
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"net"
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"time"
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"github.com/go-gost/core/listener"
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"github.com/go-gost/core/logger"
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md "github.com/go-gost/core/metadata"
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admission "github.com/go-gost/x/admission/wrapper"
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xnet "github.com/go-gost/x/internal/net"
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"github.com/go-gost/x/internal/net/proxyproto"
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"github.com/go-gost/x/internal/util/mux"
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climiter "github.com/go-gost/x/limiter/conn/wrapper"
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limiter "github.com/go-gost/x/limiter/traffic/wrapper"
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metrics "github.com/go-gost/x/metrics/wrapper"
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"github.com/go-gost/x/registry"
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)
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func init() {
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registry.ListenerRegistry().Register("mtcp", NewListener)
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}
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type mtcpListener struct {
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ln net.Listener
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cqueue chan net.Conn
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errChan chan error
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logger logger.Logger
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md metadata
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options listener.Options
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}
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func NewListener(opts ...listener.Option) listener.Listener {
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options := listener.Options{}
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for _, opt := range opts {
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opt(&options)
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}
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return &mtcpListener{
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logger: options.Logger,
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options: options,
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}
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}
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func (l *mtcpListener) Init(md md.Metadata) (err error) {
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if err = l.parseMetadata(md); err != nil {
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return
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}
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network := "tcp"
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if xnet.IsIPv4(l.options.Addr) {
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network = "tcp4"
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}
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lc := net.ListenConfig{}
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if l.md.mptcp {
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lc.SetMultipathTCP(true)
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l.logger.Debugf("mptcp enabled: %v", lc.MultipathTCP())
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}
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ln, err := lc.Listen(context.Background(), network, l.options.Addr)
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if err != nil {
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return
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}
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l.logger.Debugf("pp: %d", l.options.ProxyProtocol)
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ln = proxyproto.WrapListener(l.options.ProxyProtocol, ln, 10*time.Second)
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ln = metrics.WrapListener(l.options.Service, ln)
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ln = admission.WrapListener(l.options.Admission, ln)
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ln = limiter.WrapListener(l.options.TrafficLimiter, ln)
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ln = climiter.WrapListener(l.options.ConnLimiter, ln)
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l.ln = ln
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l.cqueue = make(chan net.Conn, l.md.backlog)
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l.errChan = make(chan error, 1)
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go l.listenLoop()
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return
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}
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func (l *mtcpListener) Addr() net.Addr {
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return l.ln.Addr()
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}
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func (l *mtcpListener) Close() error {
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return l.ln.Close()
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}
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func (l *mtcpListener) Accept() (conn net.Conn, err error) {
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var ok bool
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select {
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case conn = <-l.cqueue:
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case err, ok = <-l.errChan:
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if !ok {
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err = listener.ErrClosed
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}
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}
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return
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}
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func (l *mtcpListener) listenLoop() {
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for {
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conn, err := l.ln.Accept()
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if err != nil {
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l.errChan <- err
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close(l.errChan)
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return
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}
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go l.mux(conn)
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}
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}
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func (l *mtcpListener) mux(conn net.Conn) {
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defer conn.Close()
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session, err := mux.ServerSession(conn, l.md.muxCfg)
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if err != nil {
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l.logger.Error(err)
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return
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}
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defer session.Close()
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for {
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stream, err := session.Accept()
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if err != nil {
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l.logger.Error("accept stream: ", err)
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return
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}
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select {
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case l.cqueue <- stream:
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default:
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stream.Close()
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l.logger.Warnf("connection queue is full, client %s discarded", stream.RemoteAddr())
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}
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}
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}
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