handle create/open file error

writers/always_new_file_writer.go

@@ -22,7 +22,9 @@ type AlwaysNewFileWriter struct {
 // Write implements io.Writer
 func (w *AlwaysNewFileWriter) Write(p []byte) (n int, err error) {
 	if w.file == nil {
-		w.openFile()
+		if err = w.openFile(); err != nil {
+			return
+		}
 	}
 
 	return w.file.Write(p)

writers/daily_file_writer.go

@@ -25,10 +25,14 @@ func (w *DailyFileWriter) Write(p []byte) (n int, err error) {
 	now := time.Now()
 
 	if w.file == nil {
-		w.openFile(&now)
+		if err = w.openFile(&now); err != nil {
+			return
+		}
 	} else if now.Unix() >= w.nextDayTime {
 		w.file.Close()
-		w.openFile(&now)
+		if err = w.openFile(&now); err != nil {
+			return
+		}
 	}
 
 	return w.file.Write(p)

writers/fixed_size_file_writer.go

@@ -20,10 +20,16 @@ type FixedSizeFileWriter struct {
 // Write implements io.Writer
 func (w *FixedSizeFileWriter) Write(p []byte) (n int, err error) {
 	if w.file == nil {
-		w.openCurrentFile()
+		if err = w.openCurrentFile(); err != nil {
-	} else if w.currentSize > w.MaxSize {
+			return
+		}
+	}
+
+	if w.currentSize > w.MaxSize {
 		w.file.Close()
-		w.openNextFile()
+		if err = w.openNextFile(); err != nil {
+			return
+		}
 	}
 
 	w.currentSize += int64(len(p))