add network feature for relay

listener/serial/metadata.go

@@ -0,0 +1,17 @@
+package serial
+
+import (
+	"time"
+
+	md "github.com/go-gost/core/metadata"
+	mdutil "github.com/go-gost/core/metadata/util"
+)
+
+type metadata struct {
+	timeout time.Duration
+}
+
+func (l *serialListener) parseMetadata(md md.Metadata) (err error) {
+	l.md.timeout = mdutil.GetDuration(md, "timeout", "serial.timeout", "listener.serial.timeout")
+	return
+}