add set/get cmd

src/redis/reply/consts.go

@@ -0,0 +1,25 @@
+package reply
+
+type PongReply struct {}
+
+var PongBytes = []byte("+PONG\r\n")
+
+func (r *PongReply)ToBytes()[]byte {
+    return PongBytes
+}
+
+type OkReply struct {}
+
+var OkBytes = []byte("+OK\r\n")
+
+func (r *OkReply)ToBytes()[]byte {
+    return OkBytes
+}
+
+var nullBulkBytes = []byte("$-1\r\n")
+
+type NullBulkReply struct {}
+
+func (r *NullBulkReply)ToBytes()[]byte {
+    return nullBulkBytes
+}