Added functions to logging library

Added Logf() and WithFields() functions.
Logf() for logging formatted messages.
WithFields() for handling optional log fields.

elektronLogging/loggerChain.go

@@ -7,22 +7,48 @@ import (
 
 type Logger interface {
 	SetNext(logType Logger)
-	Log(logType int, level log.Level, logData log.Fields, message string)
+	Log(logType int, level log.Level, message string)
+	Logf(logType int, level log.Level, msgFmtString string, args ...interface{})
 	CreateLogFile(prefix string)
 }
+type baseLogData struct {
+	data log.Fields
+}
 type LoggerImpl struct {
+	*baseLogData
 	Type           int
 	AllowOnConsole bool
 	LogFile        *os.File
 	next           Logger
 }
 
+func (l *LoggerImpl) WithFields(logData log.Fields) *LoggerImpl {
+	l.data = logData
+	return l
+}
+
+func (l *LoggerImpl) WithField(key string, value string) *LoggerImpl {
+	l.data[key] = value
+	return l
+}
+
 func (l *LoggerImpl) SetNext(logType Logger) {
 	l.next = logType
 }
 
-func (l *LoggerImpl) Log(logType int, level log.Level, logData log.Fields, message string) {
+func (l LoggerImpl) Log(logType int, level log.Level, message string) {
 	if l.next != nil {
-		l.next.Log(logType, level, logData, message)
+		l.next.Log(logType, level, message)
 	}
 }
+
+func (l LoggerImpl) Logf(logType int, level log.Level, msgFmtString string, args ...interface{}) {
+	if l.next != nil {
+		l.next.Logf(logType, level, msgFmtString, args...)
+	}
+}
+
+func (l *LoggerImpl) resetFields() {
+	l.data = nil
+	l.data = log.Fields{}
+}