fix issue #4331

1. Modify Incr&Decr for file cache
2. Add different type of integer testcases for Incr&Decr

client/cache/cache_test.go

@@ -72,21 +72,9 @@ func TestCache(t *testing.T) {
 		t.Error("set Error", err)
 	}
 
-	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
+	// test different integer type for incr & decr
-		t.Error("Incr Error", err)
+	testMultiIncrDecr(t, bm, timeoutDuration)
-	}
 
-	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 2 {
-		t.Error("get err")
-	}
-
-	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
-		t.Error("Decr Error", err)
-	}
-
-	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
-		t.Error("get err")
-	}
 	bm.Delete(context.Background(), "astaxie")
 	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
@@ -153,21 +141,9 @@ func TestFileCache(t *testing.T) {
 		t.Error("get err")
 	}
 
-	if err = bm.Incr(context.Background(), "astaxie"); err != nil {
+	// test different integer type for incr & decr
-		t.Error("Incr Error", err)
+	testMultiIncrDecr(t, bm, timeoutDuration)
-	}
 
-	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 2 {
-		t.Error("get err")
-	}
-
-	if err = bm.Decr(context.Background(), "astaxie"); err != nil {
-		t.Error("Decr Error", err)
-	}
-
-	if v, _ := bm.Get(context.Background(), "astaxie"); v.(int) != 1 {
-		t.Error("get err")
-	}
 	bm.Delete(context.Background(), "astaxie")
 	if res, _ := bm.IsExist(context.Background(), "astaxie"); res {
 		t.Error("delete err")
@@ -219,3 +195,41 @@ func TestFileCache(t *testing.T) {
 
 	os.RemoveAll("cache")
 }
+
+func testMultiIncrDecr(t *testing.T, c Cache, timeout time.Duration) {
+	testIncrDecr(t, c, 1, 2, timeout)
+	testIncrDecr(t, c, int32(1), int32(2), timeout)
+	testIncrDecr(t, c, int64(1), int64(2), timeout)
+	testIncrDecr(t, c, uint(1), uint(2), timeout)
+	testIncrDecr(t, c, uint32(1), uint32(2), timeout)
+	testIncrDecr(t, c, uint64(1), uint64(2), timeout)
+}
+
+func testIncrDecr(t *testing.T, c Cache, beforeIncr interface{}, afterIncr interface{}, timeout time.Duration) {
+	var err error
+	ctx := context.Background()
+	key := "incDecKey"
+	if err = c.Put(ctx, key, beforeIncr, timeout); err != nil {
+		t.Error("Get Error", err)
+	}
+
+	if err = c.Incr(ctx, key); err != nil {
+		t.Error("Incr Error", err)
+	}
+
+	if v, _ := c.Get(ctx, key); v != afterIncr {
+		t.Error("Get Error")
+	}
+
+	if err = c.Decr(ctx, key); err != nil {
+		t.Error("Decr Error", err)
+	}
+
+	if v, _ := c.Get(ctx, key); v != beforeIncr {
+		t.Error("Get Error")
+	}
+
+	if err := c.Delete(ctx, key); err != nil {
+		t.Error("Delete Error")
+	}
+}

client/cache/file.go

@@ -26,7 +26,6 @@ import (
 	"io/ioutil"
 	"os"
 	"path/filepath"
-	"reflect"
 	"strconv"
 	"strings"
 	"time"
@@ -195,28 +194,70 @@ func (fc *FileCache) Delete(ctx context.Context, key string) error {
 // Incr increases cached int value.
 // fc value is saved forever unless deleted.
 func (fc *FileCache) Incr(ctx context.Context, key string) error {
-	data, _ := fc.Get(context.Background(), key)
+	data, err := fc.Get(context.Background(), key)
-	var incr int
+	if err != nil {
-	if reflect.TypeOf(data).Name() != "int" {
+		return err
-		incr = 0
-	} else {
-		incr = data.(int) + 1
 	}
-	fc.Put(context.Background(), key, incr, time.Duration(fc.EmbedExpiry))
+
-	return nil
+	var res interface{}
+	switch val := data.(type) {
+	case int:
+		res = val + 1
+	case int32:
+		res = val + 1
+	case int64:
+		res = val + 1
+	case uint:
+		res = val + 1
+	case uint32:
+		res = val + 1
+	case uint64:
+		res = val + 1
+	default:
+		return errors.Errorf("data is not (u)int (u)int32 (u)int64")
+	}
+
+	return fc.Put(context.Background(), key, res, time.Duration(fc.EmbedExpiry))
 }
 
 // Decr decreases cached int value.
 func (fc *FileCache) Decr(ctx context.Context, key string) error {
-	data, _ := fc.Get(context.Background(), key)
+	data, err := fc.Get(context.Background(), key)
-	var decr int
+	if err != nil {
-	if reflect.TypeOf(data).Name() != "int" || data.(int)-1 <= 0 {
+		return err
-		decr = 0
-	} else {
-		decr = data.(int) - 1
 	}
-	fc.Put(context.Background(), key, decr, time.Duration(fc.EmbedExpiry))
+
-	return nil
+	var res interface{}
+	switch val := data.(type) {
+	case int:
+		res = val - 1
+	case int32:
+		res = val - 1
+	case int64:
+		res = val - 1
+	case uint:
+		if val > 0 {
+			res = val - 1
+		} else {
+			return errors.New("data val is less than 0")
+		}
+	case uint32:
+		if val > 0 {
+			res = val - 1
+		} else {
+			return errors.New("data val is less than 0")
+		}
+	case uint64:
+		if val > 0 {
+			res = val - 1
+		} else {
+			return errors.New("data val is less than 0")
+		}
+	default:
+		return errors.Errorf("data is not (u)int (u)int32 (u)int64")
+	}
+
+	return fc.Put(context.Background(), key, res, time.Duration(fc.EmbedExpiry))
 }
 
 // IsExist checks if value exists.