get method

Future<Map<String, dynamic>?> get(String key)

Retrieves the cached value for key, or null if it is missing, expired, or written by an incompatible schema version.

Implementation

Future<Map<String, dynamic>?> get(String key) async {
  final file = _file(key);
  try {
    if (!await file.exists()) return null;
    final obj =
        json.decode(await file.readAsString()) as Map<String, dynamic>;
    if ((obj['_v'] as int?) != _schemaVersion) {
      await file.delete();
      return null;
    }
    final exp = obj['_exp'] as int?;
    if (exp == null || DateTime.now().millisecondsSinceEpoch > exp) {
      await file.delete();
      return null;
    }
    return obj['_data'] as Map<String, dynamic>?;
  } catch (_) {
    return null;
  }
}