150 lines
3.2 KiB
Go
150 lines
3.2 KiB
Go
package ws
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import (
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"crypto/tls"
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"net"
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"net/http"
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"net/http/httputil"
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"github.com/go-gost/gost/v3/pkg/common/admission"
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"github.com/go-gost/gost/v3/pkg/common/metrics"
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"github.com/go-gost/gost/v3/pkg/listener"
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"github.com/go-gost/gost/v3/pkg/logger"
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md "github.com/go-gost/gost/v3/pkg/metadata"
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"github.com/go-gost/gost/v3/pkg/registry"
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ws_util "github.com/go-gost/x/internal/util/ws"
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"github.com/gorilla/websocket"
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)
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func init() {
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registry.ListenerRegistry().Register("ws", NewListener)
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registry.ListenerRegistry().Register("wss", NewTLSListener)
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}
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type wsListener struct {
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addr net.Addr
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upgrader *websocket.Upgrader
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srv *http.Server
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tlsEnabled bool
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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 &wsListener{
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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 NewTLSListener(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 &wsListener{
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tlsEnabled: true,
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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 *wsListener) 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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l.upgrader = &websocket.Upgrader{
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HandshakeTimeout: l.md.handshakeTimeout,
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ReadBufferSize: l.md.readBufferSize,
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WriteBufferSize: l.md.writeBufferSize,
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EnableCompression: l.md.enableCompression,
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CheckOrigin: func(r *http.Request) bool { return true },
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}
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mux := http.NewServeMux()
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mux.Handle(l.md.path, http.HandlerFunc(l.upgrade))
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l.srv = &http.Server{
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Addr: l.options.Addr,
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Handler: mux,
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ReadHeaderTimeout: l.md.readHeaderTimeout,
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}
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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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ln, err := net.Listen("tcp", l.options.Addr)
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if err != nil {
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return
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}
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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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if l.tlsEnabled {
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ln = tls.NewListener(ln, l.options.TLSConfig)
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}
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l.addr = ln.Addr()
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go func() {
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err := l.srv.Serve(ln)
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if err != nil {
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l.errChan <- err
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}
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close(l.errChan)
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}()
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return
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}
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func (l *wsListener) 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 *wsListener) Close() error {
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return l.srv.Close()
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}
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func (l *wsListener) Addr() net.Addr {
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return l.addr
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}
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func (l *wsListener) upgrade(w http.ResponseWriter, r *http.Request) {
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if l.logger.IsLevelEnabled(logger.DebugLevel) {
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log := l.logger.WithFields(map[string]any{
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"local": l.addr.String(),
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"remote": r.RemoteAddr,
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})
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dump, _ := httputil.DumpRequest(r, false)
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log.Debug(string(dump))
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}
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conn, err := l.upgrader.Upgrade(w, r, l.md.header)
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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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select {
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case l.cqueue <- ws_util.Conn(conn):
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default:
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conn.Close()
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l.logger.Warnf("connection queue is full, client %s discarded", conn.RemoteAddr())
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}
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}
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