fix udp bind

pkg/connector/binder.go

@@ -0,0 +1,45 @@
+package connector
+
+import (
+	"context"
+	"errors"
+	"net"
+)
+
+var (
+	ErrBindUnsupported = errors.New("bind unsupported")
+)
+
+type Accepter interface {
+	Accept() (net.Conn, error)
+	Addr() net.Addr
+	Close() error
+}
+
+type Binder interface {
+	Bind(ctx context.Context, conn net.Conn, network, address string, opts ...BindOption) (net.Listener, error)
+}
+
+type AcceptError struct {
+	err error
+}
+
+func NewAcceptError(err error) error {
+	return &AcceptError{err: err}
+}
+
+func (e *AcceptError) Error() string {
+	return e.err.Error()
+}
+
+func (e *AcceptError) Timeout() bool {
+	return false
+}
+
+func (e *AcceptError) Temporary() bool {
+	return true
+}
+
+func (e *AcceptError) Unwrap() error {
+	return e.err
+}