From df01bfefe55816855994ed052d51fc83be814723 Mon Sep 17 00:00:00 2001
From: TossPig <code@tossp.com>
Date: Tue, 13 Dec 2022 17:56:06 +0800
Subject: [PATCH] =?UTF-8?q?=E4=BF=AE=E5=A4=8D`jsonFileHotReloadStorage`?=
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* 修复`jsonFileHotReloadStorage`在文件已存在的情况下，没有获取到文件写入权限

* fix 截获Seek的错误
---
 stroage.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/stroage.go b/stroage.go
index 399c45a..f61dc19 100644
--- a/stroage.go
+++ b/stroage.go
@@ -33,7 +33,7 @@ type jsonFileHotReloadStorage struct {
 
 func (j *jsonFileHotReloadStorage) Read(p []byte) (n int, err error) {
 	if j.file == nil {
-		j.file, err = os.Open(j.filename)
+		j.file, err = os.OpenFile(j.filename, os.O_RDWR, 0600)
 		if os.IsNotExist(err) {
 			return 0, ErrInvalidStorage
 		}
@@ -51,6 +51,12 @@ func (j *jsonFileHotReloadStorage) Write(p []byte) (n int, err error) {
 			return 0, err
 		}
 	}
+	if _, err = j.file.Seek(0, io.SeekStart); err != nil {
+		return
+	}
+	if err = j.file.Truncate(0); err != nil {
+		return
+	}
 	return j.file.Write(p)
 }