feat!: Migration auf Go-Binary

BREAKING CHANGE: Die alte Shell-Version muss vor der Installation der Go-Version deinstalliert werden.

internal/syslog/syslog.go

@@ -0,0 +1,82 @@
+package syslog
+
+import (
+	"fmt"
+	"io"
+	"log"
+	"strings"
+	"sync"
+)
+
+type Level int
+
+const (
+	Debug Level = iota
+	Info
+	Warn
+	Error
+)
+
+type Logger struct {
+	mu  sync.Mutex
+	min Level
+	log *log.Logger
+}
+
+func New(w io.Writer, min string) *Logger {
+	return &Logger{
+		min: ParseLevel(min, Info),
+		log: log.New(w, "", log.LstdFlags),
+	}
+}
+
+func ParseLevel(s string, fallback Level) Level {
+	switch strings.ToUpper(strings.TrimSpace(s)) {
+	case "DEBUG":
+		return Debug
+	case "INFO", "":
+		return Info
+	case "WARN", "WARNING":
+		return Warn
+	case "ERROR", "ERR":
+		return Error
+	default:
+		return fallback
+	}
+}
+
+func LevelName(l Level) string {
+	switch l {
+	case Debug:
+		return "DEBUG"
+	case Info:
+		return "INFO"
+	case Warn:
+		return "WARN"
+	case Error:
+		return "ERROR"
+	default:
+		return "INFO"
+	}
+}
+
+func (l *Logger) Enabled(level Level) bool {
+	if l == nil {
+		return false
+	}
+	return level >= l.min
+}
+
+func (l *Logger) Logf(level Level, format string, args ...any) {
+	if !l.Enabled(level) {
+		return
+	}
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	l.log.Printf("[%s] [ADGUARD-SHIELDD] %s", LevelName(level), fmt.Sprintf(format, args...))
+}
+
+func (l *Logger) Debugf(format string, args ...any) { l.Logf(Debug, format, args...) }
+func (l *Logger) Infof(format string, args ...any)  { l.Logf(Info, format, args...) }
+func (l *Logger) Warnf(format string, args ...any)  { l.Logf(Warn, format, args...) }
+func (l *Logger) Errorf(format string, args ...any) { l.Logf(Error, format, args...) }