file rotate by day test

logs/file.go

@@ -174,9 +174,28 @@ func (w *fileLogWriter) initFd() error {
 		}
 		w.maxLinesCurLines = count
 	}
+	if w.Daily {
+		go w.dailyRotate(w.dailyOpenTime)
+	}
 	return nil
 }
 
+func (w *fileLogWriter) dailyRotate(openTime time.Time) {
+	y, m, d := openTime.Add(24 * time.Hour).Date()
+	nextDay := time.Date(y, m, d, 0, 0, 0, 0, openTime.Location())
+	tm := time.NewTimer(time.Duration(nextDay.UnixNano() - openTime.UnixNano() + 100))
+	select {
+	case <-tm.C:
+		w.Lock()
+		if w.needRotate(0, time.Now().Day()) {
+			if err := w.doRotate(time.Now()); err != nil {
+				fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.Filename, err)
+			}
+		}
+		w.Unlock()
+	}
+}
+
 func (w *fileLogWriter) lines() (int, error) {
 	fd, err := os.Open(w.Filename)
 	if err != nil {

logs/file_test.go

@@ -17,6 +17,7 @@ package logs
 import (
 	"bufio"
 	"fmt"
+	"io/ioutil"
 	"os"
 	"strconv"
 	"testing"
@@ -125,6 +126,21 @@ func TestFileRotate_03(t *testing.T) {
 	os.Remove(fn)
 }
 
+func TestFileRotate_04(t *testing.T) {
+	fn1 := "rotate_day.log"
+	fn2 := "rotate_day." + time.Now().Add(-24*time.Hour).Format("2006-01-02") + ".log"
+	testFileDailyRotate(t, fn1, fn2)
+}
+
+func TestFileRotate_05(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"
+	testFileDailyRotate(t, fn1, fn2)
+	os.Remove(fn)
+}
+
 func testFileRotate(t *testing.T, fn1, fn2 string) {
 	fw := &fileLogWriter{
 		Daily:   true,
@@ -145,6 +161,38 @@ func testFileRotate(t *testing.T, fn1, fn2 string) {
 		}
 		os.Remove(file)
 	}
+	fw.Destroy()
+}
+
+func testFileDailyRotate(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()
+	today, _ := time.ParseInLocation("2006-01-02", time.Now().Format("2006-01-02"), fw.dailyOpenTime.Location())
+	today = today.Add(-1 * time.Second)
+	fw.dailyRotate(today)
+	for _, file := range []string{fn1, fn2} {
+		_, err := os.Stat(file)
+		if err != nil {
+			t.FailNow()
+		}
+		content, err := ioutil.ReadFile(file)
+		if err != nil {
+			t.FailNow()
+		}
+		if len(content) > 0 {
+			t.FailNow()
+		}
+		os.Remove(file)
+	}
+	fw.Destroy()
 }
 
 func exists(path string) (bool, error) {