add object pool for SaveToFile

server/web/controller.go

@@ -28,6 +28,7 @@ import (
 	"reflect"
 	"strconv"
 	"strings"
+	"sync"
 
 	"github.com/beego/beego/v2/server/web/context"
 	"github.com/beego/beego/v2/server/web/context/param"
@@ -39,8 +40,21 @@ var (
 	ErrAbort = errors.New("user stop run")
 	// GlobalControllerRouter store comments with controller. pkgpath+controller:comments
 	GlobalControllerRouter = make(map[string][]ControllerComments)
+	copyBufferPool         sync.Pool
 )
 
+const (
+	bytePerKb    = 1024
+	copyBufferKb = 32
+	filePerm     = 0666
+)
+
+func init() {
+	copyBufferPool.New = func() interface{} {
+		return make([]byte, bytePerKb*copyBufferKb)
+	}
+}
+
 // ControllerFilter store the filter for controller
 type ControllerFilter struct {
 	Pattern        string
@@ -605,20 +619,9 @@ func (c *Controller) GetFiles(key string) ([]*multipart.FileHeader, error) {
 // SaveToFile saves uploaded file to new path.
 // it only operates the first one of mutil-upload form file field.
 func (c *Controller) SaveToFile(fromFile, toFile string) error {
-	file, _, err := c.Ctx.Request.FormFile(fromFile)
-	if err != nil {
-		return err
-	}
-	defer file.Close()
-
-	f, err := os.OpenFile(toFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
-	if err != nil {
-		return err
-	}
-	defer f.Close()
-
-	_, err = io.Copy(f, file)
-	return err
+	buf := copyBufferPool.Get().([]byte)
+	defer copyBufferPool.Put(buf)
+	return c.SaveToFileWithBuffer(fromFile, toFile, buf)
 }
 
 type onlyWriter struct {
@@ -632,10 +635,11 @@ func (c *Controller) SaveToFileWithBuffer(fromFile string, toFile string, buf []
 	}
 	defer src.Close()
 
-	dst, err := os.OpenFile(toFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, 0666)
+	dst, err := os.OpenFile(toFile, os.O_WRONLY|os.O_CREATE|os.O_TRUNC, filePerm)
 	if err != nil {
 		return err
 	}
+	defer dst.Close()
 
 	_, err = io.CopyBuffer(onlyWriter{dst}, src, buf)
 	return err