flutter_dial_go

A flutter plugin for connecting to golang embeded servers via platform channel.

Getting Started

Example

make -f ./go/Makefile protoc
make -f ./go/Makefile bind-android
make -f ./go/Makefile bind-ios
flutter run

Install for golang

go get -u github.com/empirefox/flutter_dial_go
cd GOPATH/github.com/empirefox/flutter_dial_go/go
make android

Install for flutter project

Add to pubsepc.yml, replace GOPATH with real path.

dependencies:
  flutter_dial_go:
    path: GOPATH/github.com/empirefox/flutter_dial_go

Develop golang side

When write go code: Only use github.com/empirefox/flutter_dial_go/go/forgo. Do not use github.com/empirefox/flutter_dial_go/go/formobile.

import "github.com/empirefox/flutter_dial_go/go/forgo"

  // dart usage: var conn = await Conn.dial(9999)
  listener, err := forgo.Listen(9999)

Implement gomobile package exactly like: Go Example.
Copy Makefile to flutter project, then replace the GOMOBILE_PKG, APP_PATH and protoc:.
Build with the new Makefile.
For Android Studio: import go.aar and add api project(':go') to PROJECT_DIR$/android/app/build.gradle.
For Xcode: add PODS_ROOT/../Frameworks to all Framework search paths.

Develop flutter side

Init with no service.

import 'package:flutter_dial_go/flutter_dial_go.dart';

Future initGo() async {
    await Conn.startGo();
}

Or init with foreground service. For ios, service will not start and it will work like above.

import 'package:flutter_dial_go/flutter_dial_go.dart';

Future initGo() async {
    await Conn.notificationChannel(
      channelId: channelId,
      importance: importance,
      name: 'fdg running',
      description: 'keep fdg running',
    );
    await Conn.startGoWithService(
      channelId: channelId,
      notificationId: notificationId,
      title: 'flutter_dial_go example',
      text: 'make flutter dial go',
    );
}

Then dial:

    // raw http request
    // golang: forgo.Listen(9998)
    Conn c = await Conn.dial(9998);
    print('GET /\n');
    c.receiveStream
        .fold(BytesBuilder(), (BytesBuilder a, List<int> b) => a..add(b))
        .then((a) => setState(() {
              _result = 'GET / HTTP/1.0\n\n' + utf8.decode(a.takeBytes());
            }))
        .catchError((e) => setState(() {
              _result = 'Caught http error: e';
            }))
        .then((_) => c.close());
    c.add(utf8.encode('GET / HTTP/1.0\r\n\r\n'));

Or http2:

    // golang: forgo.Listen(9997)
    Conn c = await Conn.dial(9997);
    var transport = ClientTransportConnection.viaStreams(c.receiveStream, c);

Or grpc:

  Future<Http2Streams> _connect(String host, int port, ChannelCredentials credentials) async {
    // ignore: close_sinks
    final conn = await Conn.dial(port);
    return Http2Streams(conn.receiveStream, conn);
  }

    var channel = ClientChannel(
      'go',
      port: 9999,
      options: ChannelOptions(
        credentials: ChannelCredentials.insecure(),
        connect: _connect,
      ),
    );
    var stub = GreeterClient(_channel);

    ...

    channel.terminate();

Flutter Example.

empirefox / flutter_dial_go