error_handler 1.0.9

error handler for all http client in dart like dio, chopper http and more

Welcome to ErrorHandler, error handler with type-safety/streaming/freezed-functionality/cover-all-clients-exceptions

Index

• Motivation
• Functionality
• How to use
  • install
  • Example
    • .future get api result directly full example
    • .stream provide Loading and Idle State full example
    • Advance login example for post request full example
  • Other Example
  • Contribute
  • Credits 🙏

Motivation

try{}catch(e){} or then((){}).catch((){}) make code hard to read and modify

Functionality

• handle all api possible state init/loading/data/error easily
• logging the state states
• built above freezed
• **work with any http client like chopper,dio and more **

Before	After

How to use

install

For a Flutter project:

flutter pub add error_handler
flutter pub add dio

For a Dart project:

flutter pub add error_handler
flutter pub add dio

Example

.future get api result directly full example

import 'package:dio/dio.dart';
import 'package:error_handler/error_handler.dart';

FutureResponse<Post> getPost() async {
  const path = "https://jsonplaceholder.typicode.com/posts/1";
  final response = await Dio().get(path);
  return response.convert(Post.fromJson);
}

/// wrap the api call with [ErrorHandler.future]
Future<void> main() async {
  final state = await errorHandler.future(getPost);

  state.whenOrNull(
    data: (post, response) {
      print("title: ${post.title}");
    },
    error: (error) {
      print(getErrorMessage(error));
    },
  );
}

• errorHandler.future((){...}) return safe data

.stream provide Loading and Idle State full example

/// wrap the api call with [ErrorHandler.stream]
///
/// to handle loading state
void main() {
  final event = errorHandler.stream(getPost);

  event.listen((state) {
    state.whenOrNull(
      
      loading: () {
        print("loading");
      },
      data: (post, response) {
        print("title: ${post.title}");
      },
      error: (error) {
        print(getErrorMessage(error));
      },
    );
  });
}

• errorHandler.stream((){...}) first return loading and then return data or error

Advance login example for post request full example

/// First create API call
FutureResponse<User> login(String gmail, String password) async {
  final body = {"gmail": gmail, "password": password};

  final response = await Dio().post("http://your.domain.com/login", data: body);

  return response.convert(User.fromJson);
}

/// Wrap it with [ErrorHandler.stream] or [ErrorHandler.future]
StreamState<User> safeLogin(String gmail, String password) =>
    errorHandler.stream(() => login(gmail, password));

void main() {
  final event = safeLogin("[e-mail]", "password");
  event.listen((event) {
    event.whenOrNull(
      loading: () {
        print("please wait");
      },
      data: (data, response) {
        print("login successfully");
        print(data);
      },
      error: (exception) {
        print(exception.defaultErrorMessage());
      },
    );
  });
}

Other Example

• status code 401 unauthorized
• status code 401 unauthorized advance example with ErrorFilter

Contribute

please fork the repo and be part of maintainers team ❤️‍🔥

Credits 🙏

Freezed