change empty filepath to executable name

logging/logging.go

@@ -3,6 +3,8 @@ package logging
 import (
 	"fmt"
 	"os"
+	"path/filepath"
+	"strings"
 	"time"
 
 	"go.uber.org/zap"
@@ -32,7 +34,8 @@ func NewLogger(file string, cfg *Config) (*Logger, error) {
 	}
 
 	if file == "" {
-		file = "NewLogger.log"
+		file = os.Args[0]
+		file = strings.Replace(filepath.Base(file), filepath.Ext(file), ".log", 1)
 	}
 
 	encoderConfig := zap.NewProductionEncoderConfig()
@@ -44,9 +47,9 @@ func NewLogger(file string, cfg *Config) (*Logger, error) {
 
 	fileSyncer := zapcore.AddSync(&lumberjack.Logger{
 		Filename:   file,
-		MaxSize:    1, // megabytes
+		MaxSize:    cfg.MaxSize, // megabytes
-		MaxBackups: 3,
+		MaxBackups: cfg.MaxBackup,
-		MaxAge:     28, // days
+		MaxAge:     cfg.MaxAge, // days
 	})
 
 	// Create core list