add pkgs from core

dialer/tcp/metadata.go

@@ -0,0 +1,23 @@
+package tcp
+
+import (
+	"time"
+
+	md "github.com/go-gost/core/metadata"
+)
+
+const (
+	dialTimeout = "dialTimeout"
+)
+
+const (
+	defaultDialTimeout = 5 * time.Second
+)
+
+type metadata struct {
+	dialTimeout time.Duration
+}
+
+func (d *tcpDialer) parseMetadata(md md.Metadata) (err error) {
+	return
+}