more cart

pkg/actor/disk_storage.go

@@ -7,6 +7,7 @@ import (
 	"log"
 	"os"
 	"path/filepath"
+	"strings"
 	"sync"
 	"time"
 
@@ -201,6 +202,9 @@ func (s *DiskStorage[V]) SaveLoop(duration time.Duration) {
 }
 
 func (s *DiskStorage[V]) save() {
+	if s.queue == nil {
+		return
+	}
 	carts := 0
 	lines := 0
 	s.queue.Range(func(key, value any) bool {
@@ -295,3 +299,65 @@ func (s *DiskStorage[V]) openWriterCount() int {
 	defer s.writersMu.Unlock()
 	return len(s.writers)
 }
+
+func (s *DiskStorage[V]) PurgeOlderThan(ctx context.Context, retention time.Duration, isGrainActive func(id uint64) bool) (int, error) {
+	if err := s.ensureDir(); err != nil {
+		return 0, err
+	}
+
+	files, err := os.ReadDir(s.path)
+	if err != nil {
+		return 0, fmt.Errorf("read storage dir: %w", err)
+	}
+
+	cutoff := time.Now().Add(-retention)
+	purgedCount := 0
+
+	for _, entry := range files {
+		if entry.IsDir() {
+			continue
+		}
+		name := entry.Name()
+		if !strings.HasSuffix(name, ".events.log") {
+			continue
+		}
+
+		var id uint64
+		_, err := fmt.Sscanf(name, "%d.events.log", &id)
+		if err != nil {
+			continue
+		}
+
+		info, err := entry.Info()
+		if err != nil {
+			log.Printf("failed to get file info for %s: %v", name, err)
+			continue
+		}
+
+		if info.ModTime().Before(cutoff) {
+			// Check if grain is active in memory
+			if isGrainActive != nil && isGrainActive(id) {
+				continue
+			}
+
+			// Check if we have an active writer open
+			s.writersMu.Lock()
+			_, hasWriter := s.writers[id]
+			s.writersMu.Unlock()
+			if hasWriter {
+				continue
+			}
+
+			// Delete the file
+			fullPath := filepath.Join(s.path, name)
+			if err := os.Remove(fullPath); err != nil {
+				log.Printf("failed to delete expired cart log %s: %v", fullPath, err)
+			} else {
+				purgedCount++
+			}
+		}
+	}
+
+	return purgedCount, nil
+}
+