Added readme to Manager. Add support for failed logging attempt log file, to enable fail2ban...

manager/logger.go

@@ -2,6 +2,7 @@ package main
 
 import (
 	"fmt"
+	"io"
 	"log"
 	"os"
 )
@@ -12,11 +13,27 @@ type Logger struct {
 	errorLog *log.Logger
 }
 
-func NewLogger() *Logger {
+func NewLogger(logPath string) *Logger {
+	// Default to stdout/stderr
+	var infoOut io.Writer = os.Stdout
+	var errorOut io.Writer = os.Stderr
+
+	if logPath != "" {
+		// Open log file in append mode, create if not exists
+		f, err := os.OpenFile(logPath, os.O_APPEND|os.O_CREATE|os.O_WRONLY, 0644)
+		if err != nil {
+			fmt.Printf("Failed to open log file: %v\n", err)
+		} else {
+			// MultiWriter sends output to both the terminal and the file
+			infoOut = io.MultiWriter(os.Stdout, f)
+			errorOut = io.MultiWriter(os.Stderr, f)
+		}
+	}
+
 	return &Logger{
-		infoLog:  log.New(os.Stdout, "INFO  ", log.Ldate|log.Ltime|log.Lshortfile),
-		warnLog:  log.New(os.Stdout, "WARN  ", log.Ldate|log.Ltime|log.Lshortfile),
-		errorLog: log.New(os.Stderr, "ERROR ", log.Ldate|log.Ltime|log.Lshortfile),
+		infoLog:  log.New(infoOut, "INFO  ", log.Ldate|log.Ltime|log.Lshortfile),
+		warnLog:  log.New(infoOut, "WARN  ", log.Ldate|log.Ltime|log.Lshortfile),
+		errorLog: log.New(errorOut, "ERROR ", log.Ldate|log.Ltime|log.Lshortfile),
 	}
 }