Flutter Deriv API

Flutter Deriv API is an abstraction layer over Binary WebSocket (https://github.com/binary-com/websockets) for Dart and Flutter developers.

Using Flutter Deriv API

A. Creating a websocket connection

Use APIInitializer to prepare API instance for dependency injection, you can pass true to isMock parameter for testing purposes.

APIInitializer().initialize();

Establishing a connection to WebSocket needs an instance of the ConnectionInformation class for initializing API connection.

final BaseAPI api = Injector.getInjector().get<BaseAPI>();

api.connect(
    ConnectionInformation(
        appId: ...,
        brand: ...,
        endpoint: ...,
        language: ...,
    ),
    onDone: () async { ... },
    onOpen: () async { ... },
    printResponse: true,
);

B. Calling API methods

You can invoke API calls with either using classes in the abstraction layer (Ping, Order, Advert, ...) or directly with API calls from the BaseAPI class.

Calling method by abstraction layer

final Ping ping = await Ping.ping();

print(ping.succeeded);

Calling method directly with BaseAPI

final BaseAPI api = Injector.getInjector().get<BaseAPI>();

final PingResponse response =
    await api.call(request: const PingRequest());

print(response.ping);

Request Compare Predicate

To prevent adding duplicate requests Subscription Manager applies some mechanism to compare and return a suitable result if a subscription request already exists.

By default, the subscription manager uses the Equatable package to compare the current request with the request pool. Sometimes you do not want to rely on the package, in that case you can add Compare Predicate to your call API, and compare your request with already existing requests in subscription manager.

You just need to define a Compare Predicate method to compare your request.

...

subscribeToSomeApiCall(request, comparePredicate: getComparePredicate);

...

bool getComparePredicate({
    bool equatableResult,
    PendingRequest<Response> pendingRequest,
    Request request,
}) {
    SomeRequest otherRequest = pendingRequest.request as SomeRequest;
    SomeRequest currentRequest = request as SomeRequest;

    return equatableResult && otherRequest.param01 == currentRequest.param01 && ...;
}

---

Documentation

API Architecture

API Reference

The complete API reference is here.

---

Development

Clone repository

$ git clone https://github.com/regentmarkets/flutter-deriv-api.git

$ cd flutter-deriv-api
$ flutter pub get

Use this package as a library

Add this to your package's pubspec.yaml file:

dependencies:
    ...
    flutter_deriv_api:
        git:
            url: https://github.com/regentmarkets/flutter-deriv-api.git
            ref: master

Use this package as a submodule

$ git submodule add https://github.com/regentmarkets/flutter-deriv-api.git

Add this to your package's pubspec.yaml file:

dependencies:
    ...
    flutter_deriv_api:
        path: ./flutter-deriv-api/

Initialize and update submodule

$ git submodule init
$ git submodule update --remote

Run the tests

$ flutter test

Generate documentations

$ dartdoc

---

Tools

JSON Schema Parser

JsonSchemaParser class is a tool for extracting main and nested classes from model schema contents.

Using schema parser

• Call getModels(Map<String, dynamic> schema) method and pass decoded schema to it.

• Pass the result of getModels method to getClasses(List<SchemaModel> models, String className) as models parameter.

The final result is a string that contains the main class and all related classes of that schema file including Model Classes, Constructors, Properties and toJson(), fromJson(), copyWith() Methods.

Run schema parser

$ flutter pub run lib/tools/parser.dart <json_schema_path> <main_class_name>

Example

$ flutter pub run lib/tools/parser.dart active_symbols_receive.json ActiveSymbols

Notes

1. This tool is for helping developers to convert JSON Schema easier, you may require some adjustments to the result file according to your needs.
2. The resulting file will be generated in the same path as the JSON schema file.
3. Some JSON schemas are not standard and this tool may not convert them properly.