fix direct dialer

dialer/direct/conn.go

@@ -0,0 +1,41 @@
+package direct
+
+import (
+	"errors"
+	"net"
+	"time"
+)
+
+type conn struct{}
+
+func (c *conn) Close() error {
+	return nil
+}
+
+func (c *conn) Read(b []byte) (n int, err error) {
+	return 0, &net.OpError{Op: "read", Net: "nop", Source: nil, Addr: nil, Err: errors.New("read not supported")}
+}
+
+func (c *conn) Write(b []byte) (n int, err error) {
+	return 0, &net.OpError{Op: "write", Net: "nop", Source: nil, Addr: nil, Err: errors.New("write not supported")}
+}
+
+func (c *conn) LocalAddr() net.Addr {
+	return &net.TCPAddr{}
+}
+
+func (c *conn) RemoteAddr() net.Addr {
+	return &net.TCPAddr{}
+}
+
+func (c *conn) SetDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetReadDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}
+
+func (c *conn) SetWriteDeadline(t time.Time) error {
+	return &net.OpError{Op: "set", Net: "nop", Source: nil, Addr: nil, Err: errors.New("deadline not supported")}
+}

dialer/direct/dialer.go

@@ -1,4 +1,4 @@
-package tcp
+package direct
 
 import (
 	"context"
@@ -12,6 +12,7 @@ import (
 
 func init() {
 	registry.DialerRegistry().Register("direct", NewDialer)
+	registry.DialerRegistry().Register("virtual", NewDialer)
 }
 
 type directDialer struct {
@@ -34,5 +35,5 @@ func (d *directDialer) Init(md md.Metadata) (err error) {
 }
 
 func (d *directDialer) Dial(ctx context.Context, addr string, opts ...dialer.DialOption) (net.Conn, error) {
-	return nil, nil
+	return &conn{}, nil
 }