tryCall<S> function

Future<Result<S>> tryCall<S>(
  1. FutureOr<S> fn(), {
  2. Future<Result<S>> onError(
    1. Exception error
    )?,
})

Executes the given API call fn. When the call succeeds, Result.success is returned with the response. When the call fails the optional onError is executed and the exceptions are handled. If there is no onError provided, an error of type BaseError is returned in Result.failure.

Implementation

Future<Result<S>> tryCall<S>(FutureOr<S> Function() fn, {Future<Result<S>> Function(Exception error)? onError}) async {
  try {
    return Result.success(await fn());
  } on Exception catch (e) {
    if (onError != null) {
      return onError(e);
    }
    return switch (e) {
      ChopperHttpException() => Result.failure(switch (e.response.statusCode) {
        401 => const AuthenticationFailedError(),
        _ => const ServerError(),
      }),
      ClientException() => Result.failure(const NoInternetError()),
      CheckedFromJsonException() => Result.failure(const ServerError()),
      _ => Result.failure(const UnknownError()),
    };
  }
}