add method

Implementation

FutureOr<File?> add(Uint8List data, [String? checksum, String? url]) {
  // Set [url] to the [FIFOCache] as well, yet if [checksum] isn't specified,
  // then there will be no [File] written, only this.
  final String? key = checksum ?? url;
  if (key != null && !FIFOCache.exists(key)) {
    FIFOCache.set(key, data);
  }

  // Calculating SHA-256 hash from [data] on Web freezes the application.
  if (!PlatformUtils.isWeb) {
    checksum ??= sha256.convert(data).toString();
  }

  return _mutex.protect(() async {
    final Directory? cache =
        cacheDirectory.value ??= await PlatformUtils.cacheDirectory;

    if (cache != null) {
      final File file = File('${cache.path}/$checksum');
      if (!(await file.exists())) {
        await file.writeAsBytes(data);

        info.value.size = info.value.size + data.length;
        info.value.modified = (await cache.stat()).modified;
        info.refresh();
        hashes.add('$checksum');
        await _cacheLocal?.upsert(info.value);
        await _cacheLocal?.register([checksum!]);

        _optimizeCache();
      }

      return file;
    }

    return null;
  });
}