Retrofit For Dart #

retrofit.dart is a type conversion dio_http client generator using source_gen and inspired by Chopper and Retrofit.

Usage #

Generator #

Add the generator to your dev dependencies

dependencies:
  retrofit: any
  logger: any  #for logging purpose

dev_dependencies:
  retrofit_generator: any
  build_runner: any

Define and Generate your API #

import 'package:json_annotation/json_annotation.dart';
import 'package:retrofit/retrofit.dart';
import 'package:dio_http/dio_http.dart';

part 'example.g.dart';

@RestApi(baseUrl: "https://5d42a6e2bc64f90014a56ca0.mockapi.io/api/v1/")
abstract class RestClient {
  factory RestClient(Dio dio, {String baseUrl}) = _RestClient;

  @GET("/tasks")
  Future<List<Task>> getTasks();
}

@JsonSerializable()
class Task {
  String id;
  String name;
  String avatar;
  String createdAt;

  Task({this.id, this.name, this.avatar, this.createdAt});

  factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);
  Map<String, dynamic> toJson() => _$TaskToJson(this);
}

then run the generator

# dart
pub run build_runner build

# flutter	
flutter pub run build_runner build

Use it #

import 'package:logger/logger.dart';
import 'package:retrofit_example/example.dart';
import 'package:dio_http/dio_http.dart';

final logger = Logger();
void main(List<String> args) {
  final dio = Dio();   // Provide a dio instance
  dio.options.headers["Demo-Header"] = "demo header";   // config your dio headers globally
  final client = RestClient(dio);
  
  client.getTasks().then((it) => logger.i(it));

More #

Type Conversion #

Before you use the type conversion, please make sure that a factory Task.fromJson(Map<String, dynamic> json) must be provided for each model class. json_serializable is the recommanded to be used as the serialization tool.

...
@GET("/tasks")
  Future<List<Task>> getTasks();
}

@JsonSerializable()
class Task {
  String name;
  Task({this.name});
  factory Task.fromJson(Map<String, dynamic> json) => _$TaskFromJson(json);
}

HTTP Methods #

The HTTP methods in the below sample are supported.

  @GET("/tasks/{id}")
  Future<Task> getTask(@Path("id") String id);

  @GET('/demo')
  Future<String> queries(@Queries() Map<String, dynamic> queries);

  @GET("https://httpbin.org/get")
  Future<String> namedExample(
      @Query("apikey") String apiKey,
      @Query("scope") String scope, 
      @Query("type") String type,
      @Query("from") int from
  );

  @PATCH("/tasks/{id}")
  Future<Task> updateTaskPart(
      @Path() String id, @Body() Map<String, dynamic> map);

  @PUT("/tasks/{id}")
  Future<Task> updateTask(@Path() String id, @Body() Task task);

  @DELETE("/tasks/{id}")
  Future<void> deleteTask(@Path() String id);

  @POST("/tasks")
  Future<Task> createTask(@Body() Task task);

  @POST("http://httpbin.org/post")
  Future<void> createNewTaskFromFile(@Part() File file);

  @POST("http://httpbin.org/post")
  @FormUrlEncoded()
  Future<String> postUrlEncodedFormData(@Field() String hello);

Get original HTTP response #

  @GET("/tasks/{id}")
  Future<HttpResponse<Task>> getTask(@Path("id") String id)

  @GET("/tasks")
  Future<HttpResponse<List<Task>>>> getTasks()

HTTP Header #

Add a HTTP header from the parameter of the method

	@GET("/tasks")
  Future<Task> getTasks(@Header("Content-Type") String contentType );

Add static HTTP headers

	@GET("/tasks")
	@Headers(<String, dynamic>{
		"Content-Type" : "application/json",
		"Custom-Header" : "Your header"
	})
  Future<Task> getTasks();

Error Handling #

catchError(Object) should be used for capturing the exception and failed response. You can get the detailed response info from DioError.response.

 client.getTask("2").then((it){
   logger.i(it);
 }).catchError((Object obj) {
    // non-200 error goes here.
    switch (obj.runtimeType) {
      case DioError:
        // Here's the sample to get the failed response error code and message
        final res = (obj as DioError).response;
        logger.e("Got error : ${res.statusCode} -> ${res.statusMessage}");
        break;
      default:
    }
  });

}

Multiple endpoints support #

If you want to use multiple endpoints to your RestClient, you should pass your base url when you initiate RestClient. Any value defined in RestApi will be ignored.

@RestApi(baseUrl: "this url will be ignored if baseUrl is passed")
abstract class RestClient {
  factory RestClient(Dio dio, {String baseUrl}) = _RestClient;
}

final client = RestClient(dio, baseUrl: "your base url");

If you want to use the base url from dio.option.baseUrl, which has lowest priority, please don't pass any parameter to RestApi annotation and RestClient's structure method.

Hide generated files #

For the project not to be confused with the files generated by the retrofit you can hide them.

Android studio

File -> Settings -> Editor -> File Types

Add "ignore files and folders"

*.g.dart

Credits #

JetBrains. Thanks for providing the great IDE tools.

Contributors ✨ #

Thanks goes to these wonderful people (emoji key):

_{Trevor Wang} 🚇 ⚠️ 💻	_devkabiir 💻	_{Nicola Verbeeck} 💻	_ipcjs 💻	_戒尺 💻	_{Mohaned Benmesken} 💻	_{Bogdan Lukin} 💻
_sooxt98 💻	_SBNTT 💻	_{Paweł Czochański} 💻	_bar4488 💻	_via-guy 💻	_{Marco Martinelli} 💻	_LeonColt 💻
_{Alex A.F.} 💻	_{William Oprandi} 💻	_{Maciej Brażewicz} 💻	_river 💻	_{Renato Burton} 💻	_Teddy 💻	_{Ignacio Berdiñas} 💻
_themadmrj 💻	_{István Juhos} 💻	_{Akash Mondal} 💻	_JasonHezz 💻	_{Garrett Franks} 💻