give a way to access the stale cache

Author: flisky

bigcache_test.go

@@ -934,14 +934,20 @@ func TestBigCache_GetWithInfo(t *testing.T) {
 
 	// when
 	data, resp, err := cache.GetWithInfo(key)
+
+	// then
 	assertEqual(t, []byte(value), data)
 	noError(t, err)
 	assertEqual(t, Response{}, resp)
+
+	// when
 	clock.set(5)
+
+	// then
 	data, resp, err = cache.GetWithInfo(key)
 	assertEqual(t, err, nil)
 	assertEqual(t, Response{EntryStatus: Expired}, resp)
-	assertEqual(t, []byte(nil), data)
+	assertEqual(t, []byte(value), data)
 }
 
 type mockedLogger struct {

shard.go

@@ -49,15 +49,13 @@ func (s *cacheShard) getWithInfo(key string, hashedKey uint64) (entry []byte, re
 		return nil, resp, ErrEntryNotFound
 	}
 
+	entry = readEntry(wrappedEntry)
 	oldestTimeStamp := readTimestampFromEntry(wrappedEntry)
+	s.lock.RUnlock()
+	s.hit(hashedKey)
 	if currentTime-oldestTimeStamp >= s.lifeWindow {
-		s.lock.RUnlock()
 		resp.EntryStatus = Expired
-		return nil, resp, nil
 	}
-	entry = readEntry(wrappedEntry)
-	s.lock.RUnlock()
-	s.hit(hashedKey)
 	return entry, resp, nil
 }