fix: align admin behavior and Kratos integrations

pkg/logging/daily.go

@@ -0,0 +1,55 @@
+package logging
+
+import (
+	"os"
+	"path/filepath"
+	"sync"
+	"time"
+)
+
+// DailyWriter writes log entries to <root>/<yyyy-mm-dd>/<name>. It keeps the
+// file handle open for the active day and rotates on the first write after
+// midnight, matching the directory layout consumed by the log viewer.
+type DailyWriter struct {
+	mu   sync.Mutex
+	root string
+	name string
+	date string
+	file *os.File
+}
+
+func NewDailyWriter(root, name string) *DailyWriter {
+	return &DailyWriter{root: root, name: name}
+}
+
+func (w *DailyWriter) Write(value []byte) (int, error) {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	date := time.Now().Format("2006-01-02")
+	if w.file == nil || w.date != date {
+		if w.file != nil {
+			_ = w.file.Close()
+		}
+		directory := filepath.Join(w.root, date)
+		if err := os.MkdirAll(directory, 0o755); err != nil {
+			return 0, err
+		}
+		file, err := os.OpenFile(filepath.Join(directory, w.name), os.O_CREATE|os.O_APPEND|os.O_WRONLY, 0o644)
+		if err != nil {
+			return 0, err
+		}
+		w.file, w.date = file, date
+	}
+	return w.file.Write(value)
+}
+
+func (w *DailyWriter) Close() error {
+	w.mu.Lock()
+	defer w.mu.Unlock()
+	if w.file == nil {
+		return nil
+	}
+	err := w.file.Close()
+	w.file = nil
+	return err
+}