Support log file can be rotated hourly.

.gitignore

@@ -1,2 +1,3 @@
 *.sw[op]
 .DS_Store
+.idea/

config.go

@@ -127,7 +127,7 @@ func (log Logger) LoadConfiguration(filename string) {
 			continue
 		}
 
-		log[xmlfilt.Tag] = &Filter{lvl, filt}
+		log[xmlfilt.Tag] = &Filter{lvl, filt, xmlfilt.Tag}
 	}
 }
 
@@ -180,6 +180,7 @@ func xmlToFileLogWriter(filename string, props []xmlProperty, enabled bool) (*Fi
 	format := "[%D %T] [%L] (%S) %M"
 	maxlines := 0
 	maxsize := 0
+	hourly := false
 	daily := false
 	rotate := false
 
@@ -194,6 +195,8 @@ func xmlToFileLogWriter(filename string, props []xmlProperty, enabled bool) (*Fi
 			maxlines = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1000)
 		case "maxsize":
 			maxsize = strToNumSuffix(strings.Trim(prop.Value, " \r\n"), 1024)
+		case "hourly":
+			hourly = strings.Trim(prop.Value, " \r\n") != "false"
 		case "daily":
 			daily = strings.Trim(prop.Value, " \r\n") != "false"
 		case "rotate":
@@ -218,6 +221,7 @@ func xmlToFileLogWriter(filename string, props []xmlProperty, enabled bool) (*Fi
 	flw.SetFormat(format)
 	flw.SetRotateLines(maxlines)
 	flw.SetRotateSize(maxsize)
+	flw.SetRotateHourly(hourly)
 	flw.SetRotateDaily(daily)
 	return flw, true
 }

filelog.go

@@ -6,6 +6,7 @@ import (
 	"fmt"
 	"os"
 	"time"
+	"strings"
 )
 
 // This log writer sends output to a file
@@ -35,6 +36,10 @@ type FileLogWriter struct {
 	daily          bool
 	daily_opendate int
 
+	// Rotate hourly
+	hourly          bool
+	hourly_opendate int
+
 	// Keep old logfiles (.001, .002, etc)
 	rotate    bool
 	maxbackup int
@@ -97,7 +102,8 @@ func NewFileLogWriter(fname string, rotate bool) *FileLogWriter {
 				now := time.Now()
 				if (w.maxlines > 0 && w.maxlines_curlines >= w.maxlines) ||
 					(w.maxsize > 0 && w.maxsize_cursize >= w.maxsize) ||
-					(w.daily && now.Day() != w.daily_opendate) {
+					(w.hourly && now.Hour() != w.hourly_opendate) ||
+					(w.daily && now.Day() != w.daily_opendate)  {
 					if err := w.intRotate(); err != nil {
 						fmt.Fprintf(os.Stderr, "FileLogWriter(%q): %s\n", w.filename, err)
 						return
@@ -135,17 +141,19 @@ func (w *FileLogWriter) intRotate() error {
 	}
 
 	// If we are keeping log files, move it to the next available number
+	fileName := getActualPathReplacePattern(w.filename)
 	if w.rotate {
-		_, err := os.Lstat(w.filename)
+		_, err := os.Lstat(fileName)
 		if err == nil { // file exists
 			// Find the next available number
 			num := 1
 			fname := ""
+			//cutting by daily
 			if w.daily && time.Now().Day() != w.daily_opendate {
 				yesterday := time.Now().AddDate(0, 0, -1).Format("2006-01-02")
 
 				for ; err == nil && num <= w.maxbackup; num++ {
-					fname = w.filename + fmt.Sprintf(".%s.%03d", yesterday, num)
+					fname = fileName + fmt.Sprintf(".%s.%03d", yesterday, num)
 					_, err = os.Lstat(fname)
 				}
 				// return error if the last file checked still existed
@@ -155,8 +163,8 @@ func (w *FileLogWriter) intRotate() error {
 			} else {
 				num = w.maxbackup - 1
 				for ; num >= 1; num-- {
-					fname = w.filename + fmt.Sprintf(".%d", num)
-					nfname := w.filename + fmt.Sprintf(".%d", num+1)
+					fname = fileName + fmt.Sprintf(".%d", num)
+					nfname := fileName + fmt.Sprintf(".%d", num+1)
 					_, err = os.Lstat(fname)
 					if err == nil {
 						os.Rename(fname, nfname)
@@ -166,15 +174,15 @@ func (w *FileLogWriter) intRotate() error {
 
 			w.file.Close()
 			// Rename the file to its newfound home
-			err = os.Rename(w.filename, fname)
+			err = os.Rename(fileName, fname)
 			if err != nil {
 				return fmt.Errorf("Rotate: %s\n", err)
 			}
 		}
 	}
 
 	// Open the log file
-	fd, err := os.OpenFile(w.filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
+	fd, err := os.OpenFile(fileName, os.O_WRONLY|os.O_APPEND|os.O_CREATE, 0660)
 	if err != nil {
 		return err
 	}
@@ -185,6 +193,7 @@ func (w *FileLogWriter) intRotate() error {
 
 	// Set the daily open date to the current date
 	w.daily_opendate = now.Day()
+	w.hourly_opendate = now.Hour()
 
 	// initialize rotation values
 	w.maxlines_curlines = 0
@@ -227,6 +236,13 @@ func (w *FileLogWriter) SetRotateSize(maxsize int) *FileLogWriter {
 	return w
 }
 
+// Set rotate hourly (chainable). Must be called before the first log message is
+// written.
+func (w *FileLogWriter) SetRotateHourly(hourly bool) *FileLogWriter {
+	w.hourly = hourly
+	return w
+}
+
 // Set rotate daily (chainable). Must be called before the first log message is
 // written.
 func (w *FileLogWriter) SetRotateDaily(daily bool) *FileLogWriter {
@@ -262,3 +278,20 @@ func NewXMLLogWriter(fname string, rotate bool) *FileLogWriter {
 		<message>%M</message>
 	</record>`).SetHeadFoot("<log created=\"%D %T\">", "</log>")
 }
+
+
+func getActualPathReplacePattern(pattern string) string {
+	now := time.Now()
+	Y := fmt.Sprintf("%d",now.Year())
+	M := fmt.Sprintf("%02d",now.Month())
+	D := fmt.Sprintf("%02d",now.Day())
+	H := fmt.Sprintf("%02d",now.Hour())
+	m := fmt.Sprintf("%02d",now.Minute())
+
+	pattern = strings.Replace(pattern, "%Y", Y, -1)
+	pattern = strings.Replace(pattern, "%M", M, -1)
+	pattern = strings.Replace(pattern, "%D", D, -1)
+	pattern = strings.Replace(pattern, "%H", H, -1)
+	pattern = strings.Replace(pattern, "%m", m, -1)
+	return pattern
+}