Improve the response status code of kernel API `/api/file/getFile` (#9075)

* :art: Improve the response status code of API `/api/file/getFile`

* refactor: change status code from `204` to `202`

API.md

@@ -992,7 +992,24 @@ View API token in <kbd>Settings - About</kbd>, request header: `Authorization: T
     * `path`: the file path under the workspace path
 * Return value
 
-  File content
+    * Response status code `200`: File content
+    * Response status code `202`: Exception information
+
+      ```json
+      {
+        "code": 404,
+        "msg": "",
+        "data": null
+      }
+      ```
+
+        * `code`: non-zero for exceptions
+
+            * `-1`: Parameter parsing error
+            * `404`: Not Found (file doesn't exist)
+            * `405`: Method Not Allowed (it's a directory)
+            * `500`: Server Error (stat file failed / read file failed)
+        * `msg`: a piece of text describing the error
 
 ### Put file
 

API_zh_CN.md

@@ -984,7 +984,24 @@
     * `path`：工作空间路径下的文件路径
 * 返回值
 
-  文件内容
+    * 响应状态码 `200`: 文件内容
+    * 响应状态码 `202`: 异常信息
+
+      ```json
+      {
+        "code": 404,
+        "msg": "",
+        "data": null
+      }
+      ```
+
+        * `code`: 非零的异常值
+
+            * `-1`: 参数解析错误
+            * `404`: 未找到 (文件不存在)
+            * `405`: 方法不被允许 (这是一个目录)
+            * `500`: 服务器错误 (文件查询失败 / 文件读取失败)
+        * `msg`: 一段描述错误的文本
 
 ### 写入文件
 

kernel/api/file.go

@@ -84,7 +84,7 @@ func getFile(c *gin.Context) {
 	ret := gulu.Ret.NewResult()
 	arg, ok := util.JsonArg(c, ret)
 	if !ok {
-		c.JSON(http.StatusOK, ret)
+		c.JSON(http.StatusAccepted, ret)
 		return
 	}
 
@@ -93,21 +93,21 @@ func getFile(c *gin.Context) {
 	info, err := os.Stat(filePath)
 	if os.IsNotExist(err) {
 		ret.Code = 404
-		c.JSON(http.StatusOK, ret)
+		c.JSON(http.StatusAccepted, ret)
 		return
 	}
 	if nil != err {
 		logging.LogErrorf("stat [%s] failed: %s", filePath, err)
 		ret.Code = 500
 		ret.Msg = err.Error()
-		c.JSON(http.StatusOK, ret)
+		c.JSON(http.StatusAccepted, ret)
 		return
 	}
 	if info.IsDir() {
 		logging.LogErrorf("file [%s] is a directory", filePath)
 		ret.Code = 405
 		ret.Msg = "file is a directory"
-		c.JSON(http.StatusOK, ret)
+		c.JSON(http.StatusAccepted, ret)
 		return
 	}
 
@@ -116,7 +116,7 @@ func getFile(c *gin.Context) {
 		logging.LogErrorf("read file [%s] failed: %s", filePath, err)
 		ret.Code = 500
 		ret.Msg = err.Error()
-		c.JSON(http.StatusOK, ret)
+		c.JSON(http.StatusAccepted, ret)
 		return
 	}