diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..65a501e
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1 @@
+ssdb/testdb
\ No newline at end of file
diff --git a/cmd/ssdb/main.go b/cmd/ssdb/main.go
new file mode 100644
index 0000000..64b50c2
--- /dev/null
+++ b/cmd/ssdb/main.go
@@ -0,0 +1,45 @@
+package main
+
+import (
+	"flag"
+	"github.com/siddontang/go-ssdb/ssdb"
+	"os"
+	"os/signal"
+	"syscall"
+)
+
+var configFile = flag.String("config", "", "ssdb config file")
+
+func main() {
+	flag.Parse()
+
+	if len(*configFile) == 0 {
+		panic("must use a config file")
+	}
+
+	cfg, err := ssdb.NewConfigWithFile(*configFile)
+	if err != nil {
+		panic(err)
+	}
+
+	var app *ssdb.App
+	app, err = ssdb.NewApp(cfg)
+	if err != nil {
+		panic(err)
+	}
+
+	sc := make(chan os.Signal, 1)
+	signal.Notify(sc,
+		syscall.SIGHUP,
+		syscall.SIGINT,
+		syscall.SIGTERM,
+		syscall.SIGQUIT)
+
+	go func() {
+		<-sc
+
+		app.Close()
+	}()
+
+	app.Run()
+}
diff --git a/ssdb/app.go b/ssdb/app.go
index e478e64..d3286aa 100644
--- a/ssdb/app.go
+++ b/ssdb/app.go
@@ -42,8 +42,6 @@ func NewApp(cfg *Config) (*App, error) {
 		return nil, err
 	}
 
-	app.dbMutex = newKeyMutex(128)
-
 	return app, nil
 }
 
@@ -63,7 +61,3 @@ func (app *App) Run() {
 		newClient(conn, app)
 	}
 }
-
-func (app *App) getMutex(key []byte) *sync.Mutex {
-	return app.dbMutex.Get(key)
-}
diff --git a/ssdb/app_test.go b/ssdb/app_test.go
index 28f2e2a..d633f18 100644
--- a/ssdb/app_test.go
+++ b/ssdb/app_test.go
@@ -1,9 +1,72 @@
 package ssdb
 
 import (
+	"github.com/garyburd/redigo/redis"
+	"os"
+	"sync"
 	"testing"
 )
 
-func TestApp(t *testing.T) {
+var testAppOnce sync.Once
+var testApp *App
 
+var testPool *redis.Pool
+
+func newTestRedisPool() {
+	f := func() (redis.Conn, error) {
+		c, err := redis.Dial("tcp", "127.0.0.1:6380")
+		if err != nil {
+			return nil, err
+		}
+
+		return c, nil
+	}
+
+	testPool = redis.NewPool(f, 4)
+}
+
+func getTestConn() redis.Conn {
+	return testPool.Get()
+}
+
+func startTestApp() {
+	f := func() {
+		newTestRedisPool()
+
+		os.RemoveAll("./testdb")
+
+		var d = []byte(`
+            {
+                "addr" : "127.0.0.1:6380",
+                "leveldb" :     
+                {
+                    "path" : "./testdb",
+                    "compression":true,
+                    "block_size" : 32768,
+                    "write_buffer_size" : 2097152,
+                    "cache_size" : 20971520
+                }
+            }
+            `)
+
+		cfg, err := NewConfig(d)
+		if err != nil {
+			println(err.Error())
+			panic(err)
+		}
+
+		testApp, err = NewApp(cfg)
+		if err != nil {
+			println(err.Error())
+			panic(err)
+		}
+
+		go testApp.Run()
+	}
+
+	testAppOnce.Do(f)
+}
+
+func TestApp(t *testing.T) {
+	startTestApp()
 }
diff --git a/ssdb/client.go b/ssdb/client.go
index 36e549c..2c8ad96 100644
--- a/ssdb/client.go
+++ b/ssdb/client.go
@@ -12,7 +12,7 @@ import (
 	"strings"
 )
 
-var errReadRequest = errors.New("read request error, invalid format")
+var errReadRequest = errors.New("invalid request protocol")
 
 type client struct {
 	app *App
@@ -88,15 +88,16 @@ func (c *client) readRequest() ([][]byte, error) {
 		return nil, errReadRequest
 	}
 
-	var n int
-	if n, err = strconv.Atoi(hack.String(l[1:])); err != nil {
+	var nparams int
+	if nparams, err = strconv.Atoi(hack.String(l[1:])); err != nil {
 		return nil, err
-	} else if n <= 0 {
+	} else if nparams <= 0 {
 		return nil, errReadRequest
 	}
 
-	req := make([][]byte, 0, n)
-	for i := 0; i < n; i++ {
+	req := make([][]byte, 0, nparams)
+	var n int
+	for i := 0; i < nparams; i++ {
 		if l, err = c.readLine(); err != nil {
 			return nil, err
 		}
@@ -115,12 +116,15 @@ func (c *client) readRequest() ([][]byte, error) {
 					return nil, err
 				} else if buf[len(buf)-2] != '\r' || buf[len(buf)-1] != '\n' {
 					return nil, errReadRequest
+
 				} else {
 					req = append(req, buf[0:len(buf)-2])
 				}
 			}
 
 		} else {
+			println("return 6")
+
 			return nil, errReadRequest
 		}
 	}
diff --git a/ssdb/cmd_kv_test.go b/ssdb/cmd_kv_test.go
new file mode 100644
index 0000000..49fc92f
--- /dev/null
+++ b/ssdb/cmd_kv_test.go
@@ -0,0 +1,145 @@
+package ssdb
+
+import (
+	"github.com/garyburd/redigo/redis"
+	"testing"
+)
+
+func TestKV(t *testing.T) {
+	startTestApp()
+
+	c := getTestConn()
+	defer c.Close()
+
+	if ok, err := redis.String(c.Do("set", "a", "1234")); err != nil {
+		t.Fatal(err)
+	} else if ok != OK {
+		t.Fatal(ok)
+	}
+
+	if n, err := redis.Int(c.Do("setnx", "a", "123")); err != nil {
+		t.Fatal(err)
+	} else if n != 0 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int(c.Do("setnx", "b", "123")); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatal(n)
+	}
+
+	if v, err := redis.String(c.Do("get", "a")); err != nil {
+		t.Fatal(err)
+	} else if v != "1234" {
+		t.Fatal(v)
+	}
+
+	if v, err := redis.String(c.Do("getset", "a", "123")); err != nil {
+		t.Fatal(err)
+	} else if v != "1234" {
+		t.Fatal(v)
+	}
+
+	if v, err := redis.String(c.Do("get", "a")); err != nil {
+		t.Fatal(err)
+	} else if v != "123" {
+		t.Fatal(v)
+	}
+
+	if n, err := redis.Int(c.Do("exists", "a")); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int(c.Do("exists", "empty_key_test")); err != nil {
+		t.Fatal(err)
+	} else if n != 0 {
+		t.Fatal(n)
+	}
+
+	if _, err := redis.Int(c.Do("del", "a", "b")); err != nil {
+		t.Fatal(err)
+	}
+
+	if n, err := redis.Int(c.Do("exists", "a")); err != nil {
+		t.Fatal(err)
+	} else if n != 0 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int(c.Do("exists", "b")); err != nil {
+		t.Fatal(err)
+	} else if n != 0 {
+		t.Fatal(n)
+	}
+}
+
+func TestKVM(t *testing.T) {
+	startTestApp()
+
+	c := getTestConn()
+	defer c.Close()
+
+	if ok, err := redis.String(c.Do("mset", "a", "1", "b", "2")); err != nil {
+		t.Fatal(err)
+	} else if ok != OK {
+		t.Fatal(ok)
+	}
+
+	if v, err := redis.MultiBulk(c.Do("mget", "a", "b", "c")); err != nil {
+		t.Fatal(err)
+	} else if len(v) != 3 {
+		t.Fatal(len(v))
+	} else {
+		if vv, ok := v[0].([]byte); !ok || string(vv) != "1" {
+			t.Fatal("not 1")
+		}
+
+		if vv, ok := v[1].([]byte); !ok || string(vv) != "2" {
+			t.Fatal("not 2")
+		}
+
+		if v[2] != nil {
+			t.Fatal("must nil")
+		}
+	}
+}
+
+func TestKVIncrDecr(t *testing.T) {
+	startTestApp()
+
+	c := getTestConn()
+	defer c.Close()
+
+	if n, err := redis.Int64(c.Do("incr", "n")); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int64(c.Do("incr", "n")); err != nil {
+		t.Fatal(err)
+	} else if n != 2 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int64(c.Do("decr", "n")); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int64(c.Do("incrby", "n", 10)); err != nil {
+		t.Fatal(err)
+	} else if n != 11 {
+		t.Fatal(n)
+	}
+
+	if n, err := redis.Int64(c.Do("decrby", "n", 10)); err != nil {
+		t.Fatal(err)
+	} else if n != 1 {
+		t.Fatal(n)
+	}
+}
diff --git a/ssdb/t_kv.go b/ssdb/t_kv.go
index 96240f7..b7bb4d4 100644
--- a/ssdb/t_kv.go
+++ b/ssdb/t_kv.go
@@ -10,7 +10,7 @@ var errEmptyKVKey = errors.New("invalid empty kv key")
 var errKVKey = errors.New("invalid encode kv key")
 
 func encode_kv_key(key []byte) []byte {
-	ek := make([]byte, key+1)
+	ek := make([]byte, len(key)+1)
 	ek[0] = KV_TYPE
 	copy(ek[1:], key)
 	return ek
@@ -97,7 +97,7 @@ func (a *App) kv_exists(key []byte) (int64, error) {
 
 	var v []byte
 	v, err = a.db.Get(key)
-	if v != nil && err != nil {
+	if v != nil && err == nil {
 		return 1, nil
 	} else {
 		return 0, err
diff --git a/ssdb/tx.go b/ssdb/tx.go
index 658b034..2f34525 100644
--- a/ssdb/tx.go
+++ b/ssdb/tx.go
@@ -33,7 +33,6 @@ func (t *tx) Commit() error {
 	return err
 }
 
-func (t *tx) Rollback() error {
-	err := t.wb.Rollback()
-	return err
+func (t *tx) Rollback() {
+	t.wb.Rollback()
 }