Init V4 community edition (#2265)

* Init V4 community edition

* Init V4 community edition

pkg/util/io.go

@@ -22,7 +22,6 @@ func CreatNestedFile(path string) (*os.File, error) {
 	if !Exists(basePath) {
 		err := os.MkdirAll(basePath, 0700)
 		if err != nil {
-			Log().Warning("Failed to create directory: %s", err)
 			return nil, err
 		}
 	}
@@ -30,6 +29,19 @@ func CreatNestedFile(path string) (*os.File, error) {
 	return os.Create(path)
 }
 
+// CreatNestedFolder creates a folder with the given path, if the directory does not exist,
+// it will be created recursively.
+func CreatNestedFolder(path string) error {
+	if !Exists(path) {
+		err := os.MkdirAll(path, 0700)
+		if err != nil {
+			return err
+		}
+	}
+
+	return nil
+}
+
 // IsEmpty 返回给定目录是否为空目录
 func IsEmpty(name string) (bool, error) {
 	f, err := os.Open(name)
@@ -44,3 +56,21 @@ func IsEmpty(name string) (bool, error) {
 	}
 	return false, err // Either not empty or error, suits both cases
 }
+
+type CallbackReader struct {
+	reader   io.Reader
+	callback func(int64)
+}
+
+func NewCallbackReader(reader io.Reader, callback func(int64)) *CallbackReader {
+	return &CallbackReader{
+		reader:   reader,
+		callback: callback,
+	}
+}
+
+func (r *CallbackReader) Read(p []byte) (n int, err error) {
+	n, err = r.reader.Read(p)
+	r.callback(int64(n))
+	return
+}