actually make use of the LogLevel type

why else would it be defined?
and this is sane anyway.

pkg/log/console.go

@@ -46,7 +46,7 @@ var (
 // ConsoleWriter implements LoggerInterface and writes messages to terminal.
 type ConsoleWriter struct {
 	lg         *log.Logger
-	Level      int  `json:"level"`
+	Level      LogLevel `json:"level"`
 	Formatting bool     `json:"formatting"`
 }
 
@@ -63,7 +63,7 @@ func (cw *ConsoleWriter) Init(config string) error {
 	return json.Unmarshal([]byte(config), cw)
 }
 
-func (cw *ConsoleWriter) WriteMsg(msg string, skip, level int) error {
+func (cw *ConsoleWriter) WriteMsg(msg string, skip int, level LogLevel) error {
 	if cw.Level > level {
 		return nil
 	}
@@ -82,11 +82,11 @@ func (_ *ConsoleWriter) Flush() {
 func (_ *ConsoleWriter) Destroy() {
 }
 
-func printConsole(level int, msg string) {
+func printConsole(level LogLevel, msg string) {
 	consoleWriter.WriteMsg(msg, 0, level)
 }
 
-func printfConsole(level int, format string, v ...interface{}) {
+func printfConsole(level LogLevel, format string, v ...interface{}) {
 	consoleWriter.WriteMsg(fmt.Sprintf(format, v...), 0, level)
 }
 

pkg/log/file.go

@@ -41,7 +41,7 @@ type FileLogWriter struct {
 
 	startLock sync.Mutex // Only one log can write to the file
 
-	Level int `json:"level"`
+	Level LogLevel `json:"level"`
 }
 
 // an *os.File writer with locker.
@@ -132,7 +132,7 @@ func (w *FileLogWriter) docheck(size int) {
 }
 
 // write logger message into file.
-func (w *FileLogWriter) WriteMsg(msg string, skip, level int) error {
+func (w *FileLogWriter) WriteMsg(msg string, skip int, level LogLevel) error {
 	if level < w.Level {
 		return nil
 	}

pkg/log/log.go

@@ -99,7 +99,7 @@ func Close() {
 type LogLevel int
 
 const (
-	TRACE = iota
+	TRACE LogLevel = iota
 	DEBUG
 	INFO
 	WARN
@@ -111,7 +111,7 @@ const (
 // LoggerInterface represents behaviors of a logger provider.
 type LoggerInterface interface {
 	Init(config string) error
-	WriteMsg(msg string, skip, level int) error
+	WriteMsg(msg string, skip int, level LogLevel) error
 	Destroy()
 	Flush()
 }
@@ -132,7 +132,8 @@ func Register(name string, log loggerType) {
 }
 
 type logMsg struct {
-	skip, level int
+	skip  int
+	level LogLevel
 	msg   string
 }
 
@@ -141,7 +142,7 @@ type logMsg struct {
 type Logger struct {
 	adapter string
 	lock    sync.Mutex
-	level   int
+	level   LogLevel
 	msg     chan *logMsg
 	outputs map[string]LoggerInterface
 	quit    chan bool
@@ -188,7 +189,7 @@ func (l *Logger) DelLogger(adapter string) error {
 	return nil
 }
 
-func (l *Logger) writerMsg(skip, level int, msg string) error {
+func (l *Logger) writerMsg(skip int, level LogLevel, msg string) error {
 	if l.level > level {
 		return nil
 	}

pkg/log/syslog.go

@@ -39,7 +39,7 @@ func (sw *SyslogWriter) Init(config string) error {
 	return nil
 }
 
-func (sw *SyslogWriter) WriteMsg(msg string, skip, level int) error {
+func (sw *SyslogWriter) WriteMsg(msg string, skip int, level LogLevel) error {
 	var err error
 
 	switch level {