From 22617aeb1380e7be2371406d9d2ba61405c715f3 Mon Sep 17 00:00:00 2001
From: JessonChan <chinachendongpo@gmail.com>
Date: Tue, 12 Apr 2016 15:05:35 +0800
Subject: [PATCH 1/2] file rotate name fixed

---
 logs/file.go | 29 ++++++++++++++++++++---------
 1 file changed, 20 insertions(+), 9 deletions(-)

diff --git a/logs/file.go b/logs/file.go
index 5901143b..37edecf0 100644
--- a/logs/file.go
+++ b/logs/file.go
@@ -47,6 +47,7 @@ type fileLogWriter struct {
 	Daily         bool  `json:"daily"`
 	MaxDays       int64 `json:"maxdays"`
 	dailyOpenDate int
+	dailyOpenTime time.Time
 
 	Rotate bool `json:"rotate"`
 
@@ -163,7 +164,8 @@ func (w *fileLogWriter) initFd() error {
 		return fmt.Errorf("get stat err: %s\n", err)
 	}
 	w.maxSizeCurSize = int(fInfo.Size())
-	w.dailyOpenDate = time.Now().Day()
+	w.dailyOpenTime = time.Now()
+	w.dailyOpenDate = w.dailyOpenTime.Day()
 	w.maxLinesCurLines = 0
 	if fInfo.Size() > 0 {
 		count, err := w.lines()
@@ -205,22 +207,29 @@ func (w *fileLogWriter) lines() (int, error) {
 // DoRotate means it need to write file in new file.
 // new file name like xx.2013-01-01.log (daily) or xx.001.log (by line or size)
 func (w *fileLogWriter) doRotate(logTime time.Time) error {
-	_, err := os.Lstat(w.Filename)
-	if err != nil {
-		return err
-	}
 	// file exists
 	// Find the next available number
 	num := 1
 	fName := ""
+
+	_, err := os.Lstat(w.Filename)
+	if err != nil {
+		//even if the file is not exist or other ,we should RESTART the logger
+		goto RESTART_LOGGER
+	}
+
 	if w.MaxLines > 0 || w.MaxSize > 0 {
 		for ; err == nil && num <= 999; num++ {
 			fName = w.fileNameOnly + fmt.Sprintf(".%s.%03d%s", logTime.Format("2006-01-02"), num, w.suffix)
 			_, err = os.Lstat(fName)
 		}
 	} else {
-		fName = fmt.Sprintf("%s.%s%s", w.fileNameOnly, logTime.Format("2006-01-02"), w.suffix)
+		fName = fmt.Sprintf("%s.%s%s", w.fileNameOnly, w.dailyOpenTime.Format("2006-01-02"), w.suffix)
 		_, err = os.Lstat(fName)
+		for ; err == nil && num <= 999; num++ {
+			fName = w.fileNameOnly + fmt.Sprintf(".%s.%03d%s", w.dailyOpenTime.Format("2006-01-02"), num, w.suffix)
+			_, err = os.Lstat(fName)
+		}
 	}
 	// return error if the last file checked still existed
 	if err == nil {
@@ -232,16 +241,18 @@ func (w *fileLogWriter) doRotate(logTime time.Time) error {
 
 	// Rename the file to its new found name
 	// even if occurs error,we MUST guarantee to  restart new logger
-	renameErr := os.Rename(w.Filename, fName)
+	err = os.Rename(w.Filename, fName)
 	// re-start logger
+RESTART_LOGGER:
+
 	startLoggerErr := w.startLogger()
 	go w.deleteOldLog()
 
 	if startLoggerErr != nil {
 		return fmt.Errorf("Rotate StartLogger: %s\n", startLoggerErr)
 	}
-	if renameErr != nil {
-		return fmt.Errorf("Rotate: %s\n", renameErr)
+	if err != nil {
+		return fmt.Errorf("Rotate: %s\n", err)
 	}
 	return nil
 

From abaa1bbcac9c0714903f3e586e50fddd91213571 Mon Sep 17 00:00:00 2001
From: JessonChan <chinachendongpo@gmail.com>
Date: Wed, 13 Apr 2016 09:05:16 +0800
Subject: [PATCH 2/2] file rotate file test

---
 logs/file.go      |  4 ++++
 logs/file_test.go | 39 ++++++++++++++++++++++++++++++++++++++-
 2 files changed, 42 insertions(+), 1 deletion(-)

diff --git a/logs/file.go b/logs/file.go
index 37edecf0..8cf20372 100644
--- a/logs/file.go
+++ b/logs/file.go
@@ -267,6 +267,10 @@ func (w *fileLogWriter) deleteOldLog() {
 			}
 		}()
 
+		if info == nil {
+			return
+		}
+
 		if !info.IsDir() && info.ModTime().Add(24*time.Hour*time.Duration(w.MaxDays)).Before(time.Now()) {
 			if strings.HasPrefix(filepath.Base(path), filepath.Base(w.fileNameOnly)) &&
 				strings.HasSuffix(filepath.Base(path), w.suffix) {
diff --git a/logs/file_test.go b/logs/file_test.go
index 1fa6cdaa..176f4c1e 100644
--- a/logs/file_test.go
+++ b/logs/file_test.go
@@ -89,7 +89,7 @@ func TestFile2(t *testing.T) {
 	os.Remove("test2.log")
 }
 
-func TestFileRotate(t *testing.T) {
+func TestFileRotate_01(t *testing.T) {
 	log := NewLogger(10000)
 	log.SetLogger("file", `{"filename":"test3.log","maxlines":4}`)
 	log.Debug("debug")
@@ -110,6 +110,43 @@ func TestFileRotate(t *testing.T) {
 	os.Remove("test3.log")
 }
 
+func TestFileRotate_02(t *testing.T) {
+	fn1 := "rotate_day.log"
+	fn2 := "rotate_day." + time.Now().Add(-24*time.Hour).Format("2006-01-02") + ".log"
+	testFileRotate(t, fn1, fn2)
+}
+
+func TestFileRotate_03(t *testing.T) {
+	fn1 := "rotate_day.log"
+	fn := "rotate_day." + time.Now().Add(-24*time.Hour).Format("2006-01-02") + ".log"
+	os.Create(fn)
+	fn2 := "rotate_day." + time.Now().Add(-24*time.Hour).Format("2006-01-02") + ".001.log"
+	testFileRotate(t, fn1, fn2)
+	os.Remove(fn)
+}
+
+func testFileRotate(t *testing.T, fn1, fn2 string) {
+	fw := &fileLogWriter{
+		Daily:   true,
+		MaxDays: 7,
+		Rotate:  true,
+		Level:   LevelTrace,
+		Perm:    0660,
+	}
+	fw.Init(fmt.Sprintf(`{"filename":"%v","maxdays":1}`, fn1))
+	fw.dailyOpenTime = time.Now().Add(-24 * time.Hour)
+	fw.dailyOpenDate = fw.dailyOpenTime.Day()
+	fw.WriteMsg(time.Now(), "this is a msg for test", LevelDebug)
+
+	for _, file := range []string{fn1, fn2} {
+		_, err := os.Stat(file)
+		if err != nil {
+			t.FailNow()
+		}
+		os.Remove(file)
+	}
+}
+
 func exists(path string) (bool, error) {
 	_, err := os.Stat(path)
 	if err == nil {