handling response

[andredev24]

How to handle common use cases or errors from the response?

This looks good for 5, 10 functions. But what if our ApiRepository grows considerably.

class ApiRepository {

  // [...] Constructor

  final ClientChannel channel;

  late final AppClient appClient;

  /// The only way to handle errors is by passing _handleException in each method.
  Future<void> login(String phoneNumber, String password) async {
    try {
      final req = LoginReq(phoneNumber: phoneNumber, password: password);
      await appClient.login(req);
    } on GrpcError catch (err) {
      return _handleException(err);
    }
  }

  /// The only way to handle errors is by passing _handleException in each method.
  Future<void> userMe(String? token) async {
    CallOptions? options;
    if (token != null) {
      options = CallOptions(metadata: <String, String>{
        "authorization": token,
      });
    }

    try {
      // create request example
      final req = UserMeReq();
      await appClient.userMe(req, options: options);
    } on GrpcError catch (err) {
      return _handleException(err);
    }
  }

  _handleException(GrpcError err) {
    switch (err.code) {
      case StatusCode.invalidArgument:
        throw InvalidArgumentException(err.message);
      case StatusCode.unauthenticated:
        throw UnauthenticatedException(err.message);
    // We can continue to handle the necessary cases ...
      default:
        throw InternalException(err.message);
    }
  }
}