Network Service Prototype

network_service_prototype.dart

class NetworkService {
  NetworkService({
    required this.baseUrl, // Base service url 
    dioClient, // Prepared Dio instance could be injected 
    httpHeaders, // Global headers could be provided as well
  })  : this._dio = dioClient,
        this._headers = httpHeaders ?? {};
  Dio? _dio;
  final String baseUrl;
  Map<String, String> _headers;
  Future<Dio> _getDefaultDioClient() async {
    // Global http header
    _headers['content-type'] = 'application/json; charset=utf-8';
    final dio = Dio.Dio()
      ..options.baseUrl = baseUrl
      ..options.headers = _headers
      ..options.connectTimeout = 5000 // 5 seconds
      ..options.receiveTimeout = 3000; // 3 seconds
      
    return dio;
  }
  // Generic type and parser are used to properly deserialise JSON
  Future<NetworkResponse<Model>> execute<Model>(
    NetworkRequest request,
    Model Function(Map<String, dynamic>) parser, {
    ProgressCallback? onSendProgress = null,
    ProgressCallback? onReceiveProgress = null,
  }) async {
    if (_dio == null) {
      _dio = await _getDefaultDioClient();
    }
    // 1. Prepare the request
    // 2. Execute it
    // 3. Return parsed result or error
  }
}