add dbsize command

cluster/cluster.go

@@ -155,6 +155,12 @@ func (cluster *Cluster) Exec(c redis.Connection, cmdLine [][]byte) (result redis
 		return protocol.MakeErrReply("NOAUTH Authentication required")
 	}
 
+	if cmdName == "dbsize" {
+		if ser, ok := cluster.db.(*database2.Server); ok {
+			return database2.DbSize(c, ser)
+		}
+	}
+
 	if cmdName == "multi" {
 		if len(cmdLine) != 1 {
 			return protocol.MakeArgNumErrReply(cmdName)

commands.md

@@ -19,6 +19,7 @@
     - keys
     - bgrewriteaof
     - copy
+    - dbsize
 - String
     - set
     - setnx

database/server.go

@@ -117,6 +117,9 @@ func (server *Server) Exec(c redis.Connection, cmdLine [][]byte) (result redis.R
 	if cmdName == "info" {
 		return Info(server, cmdLine[1:])
 	}
+	if cmdName == "dbsize" {
+		return DbSize(c, server)
+	}
 	if cmdName == "slaveof" {
 		if c != nil && c.InMultiState() {
 			return protocol.MakeErrReply("cannot use slave of database within multi")

database/systemcmd.go

@@ -74,6 +74,11 @@ func isAuthenticated(c redis.Connection) bool {
 	return c.GetPassword() == config.Properties.RequirePass
 }
 
+func DbSize(c redis.Connection, db *Server) redis.Reply {
+	keys, _ := db.GetDBSize(c.GetDBIndex())
+	return protocol.MakeIntReply(int64(keys))
+}
+
 func GenGodisInfoString(section string, db *Server) []byte {
 	startUpTimeFromNow := getGodisRuninngTime()
 	switch section {

database/systemcmd_test.go

@@ -5,7 +5,9 @@ import (
 	"github.com/hdt3213/godis/lib/utils"
 	"github.com/hdt3213/godis/redis/connection"
 	"github.com/hdt3213/godis/redis/protocol/asserts"
+	"math/rand"
 	"testing"
+	"time"
 )
 
 func TestPing(t *testing.T) {
@@ -59,3 +61,16 @@ func TestInfo(t *testing.T) {
 	ret = testServer.Exec(c, utils.ToCmdLine("INFO", "abc"))
 	asserts.AssertErrReply(t, ret, "Invalid section for 'info' command")
 }
+
+func TestDbSize(t *testing.T) {
+	c := connection.NewFakeConn()
+	rand.NewSource(time.Now().UnixNano())
+	randomNum := rand.Intn(10) + 1
+	for i := 0; i < randomNum; i++ {
+		key := utils.RandString(10)
+		value := utils.RandString(10)
+		testServer.Exec(c, utils.ToCmdLine("SET", key, value))
+	}
+	ret := testServer.Exec(c, utils.ToCmdLine("dbsize"))
+	asserts.AssertIntReply(t, ret, randomNum)
+}