feat: impl. trans & ttl

gold/proto/hello/hello.go

@@ -0,0 +1,26 @@
+package hello
+
+import (
+	"github.com/fumiama/orbyte/pbuf"
+	"github.com/sirupsen/logrus"
+
+	"github.com/fumiama/WireGold/gold/head"
+	"github.com/fumiama/WireGold/gold/link"
+	"github.com/fumiama/WireGold/internal/file"
+)
+
+func init() {
+	link.RegisterDispacher(head.ProtoHello, func(_ *head.Packet, peer *link.Link, data pbuf.Bytes) {
+		data.V(func(b []byte) {
+			switch {
+			case len(b) == 0:
+				logrus.Warnln(file.Header(), "recv old packet, do nothing")
+			case b[0] == byte(head.HelloPing):
+				go peer.WritePacket(head.ProtoHello, []byte{byte(head.HelloPong)}, peer.Me().TTL())
+				logrus.Infoln(file.Header(), "recv, send ack")
+			default:
+				logrus.Infoln(file.Header(), "recv ack, do nothing")
+			}
+		})
+	})
+}