refactor project structure

db/server.go

@@ -0,0 +1,17 @@
+package db
+
+import (
+	"github.com/hdt3213/godis/interface/redis"
+	"github.com/hdt3213/godis/redis/reply"
+)
+
+// Ping the server
+func Ping(db *DB, args [][]byte) redis.Reply {
+	if len(args) == 0 {
+		return &reply.PongReply{}
+	} else if len(args) == 1 {
+		return reply.MakeStatusReply(string(args[0]))
+	} else {
+		return reply.MakeErrReply("ERR wrong number of arguments for 'ping' command")
+	}
+}