refactor: flatten repository structure to root and archive research notes

internal/opslog/opslog.go

@@ -0,0 +1,39 @@
+package opslog
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+type Logger struct {
+	dir string
+	mu  sync.Mutex
+}
+
+func New(dir string) *Logger {
+	if dir == "" {
+		return nil
+	}
+	return &Logger{dir: dir}
+}
+
+func (l *Logger) Write(ip, user, action string) error {
+	if l == nil || l.dir == "" {
+		return nil
+	}
+	l.mu.Lock()
+	defer l.mu.Unlock()
+	if err := os.MkdirAll(l.dir, 0755); err != nil {
+		return err
+	}
+	f, err := os.OpenFile(filepath.Join(l.dir, "ops.log"), os.O_CREATE|os.O_WRONLY|os.O_APPEND, 0644)
+	if err != nil {
+		return err
+	}
+	defer f.Close()
+	_, err = fmt.Fprintf(f, "%s - %s - user(%s) %s\n", time.Now().Format("2006-01-02 15:04:05"), ip, user, action)
+	return err
+}