itamadev/golang-flutter-app-ffi

A Flutter app with Golang as a backend using FFI to bind and communicate between them

Golang Flutter App FFI

This repo demonstrates a very simple Flutter app with Golang used as backend lanugage, communicating using FFI (Foreign Function Interface), the app is a very simple note taking app that currently allows you to whip up a message and save it into a message.txt file.

Example

Prerequisites

• go
• make
• flutter sdk version 2.16.2^

Usage

Try it out:

$ make run

# Overrite FLUTTER_DEVICE to change the flutter device build option
# WARNNING: may not work with certain devices
$ make run FLUTTER_DEVICE=chrome

Tested Devices

The following are the Flutter Supported Devices

Mobile

• android
• ios

Desktop

• windows
• linux

Project Structure

• lib
  • main.dart
  • create_message.dart
• vendor
  • text.go
  • go.mod
• vendor/out (tmp)
  • text.a
  • text.h

lib - flutter code files

create_message.dart - Golang logic using FFI to Dart

vendor - Golang files as backend

vendor/out - Golang compiled files

License

MIT.

golang-flutter-app-ffi's Issues

Consuming WASM (golang) with flutter

Compiling Golang to WASI so flutter will be able to consume and use it's functional code with set interface

Testing building and running `ios` project

Error: no such file or directory

Hey, just testing your little demo out as I'm looking for a good way to build mobile apps in Flutter (for the UI part) with a Go backend.

I tried to build this on my iMac, deployed to my iPhone and got this error:

══╡ EXCEPTION CAUGHT BY GESTURE ╞═══════════════════════════════════════════════════════════════════
The following ArgumentError was thrown while handling a gesture:
Invalid argument(s): Failed to load dynamic library './vendor-out/text.a':
dlopen(./vendor-out/text.a, 0x0001): tried: '/usr/lib/swift/./vendor-out/text.a' (no such file),
'/private/var/containers/Bundle/Application/407A3657-732C-43E9-BEF6-D4C2FB5EF36C/Runner.app/Frameworks/./vendor-out/text.a'
(no such file), './vendor-out/text.a' (no such file)

When the exception was thrown, this was the stack:
#0      _open (dart:ffi-patch/ffi_dynamic_library_patch.dart:12:43)
#1      new DynamicLibrary.open (dart:ffi-patch/ffi_dynamic_library_patch.dart:23:12)
#2      dylib (package:app/create_message.dart:9:34)
#3      dylib (package:app/create_message.dart)
#4      _createMessage (package:app/create_message.dart:11:38)
#5      _createMessage (package:app/create_message.dart)
#6      createMessage (package:app/create_message.dart:16:3)
#7      _CreateTextFormState.build.<anonymous closure> (package:app/main.dart:54:11)
#8      _InkResponseState.handleTap (package:flutter/src/material/ink_well.dart:1072:21)
#9      GestureRecognizer.invokeCallback (package:flutter/src/gestures/recognizer.dart:253:24)
#10     TapGestureRecognizer.handleTapUp (package:flutter/src/gestures/tap.dart:627:11)
#11     BaseTapGestureRecognizer._checkUp (package:flutter/src/gestures/tap.dart:306:5)
#12     BaseTapGestureRecognizer.acceptGesture (package:flutter/src/gestures/tap.dart:276:7)
#13     GestureArenaManager.sweep (package:flutter/src/gestures/arena.dart:163:27)
#14     GestureBinding.handleEvent (package:flutter/src/gestures/binding.dart:464:20)
#15     GestureBinding.dispatchEvent (package:flutter/src/gestures/binding.dart:440:22)
#16     RendererBinding.dispatchEvent (package:flutter/src/rendering/binding.dart:337:11)
#17     GestureBinding._handlePointerEventImmediately (package:flutter/src/gestures/binding.dart:395:7)
#18     GestureBinding.handlePointerEvent (package:flutter/src/gestures/binding.dart:357:5)
#19     GestureBinding._flushPointerEventQueue (package:flutter/src/gestures/binding.dart:314:7)
#20     GestureBinding._handlePointerDataPacket (package:flutter/src/gestures/binding.dart:295:7)
#21     _invoke1 (dart:ui/hooks.dart:167:13)
#22     PlatformDispatcher._dispatchPointerDataPacket (dart:ui/platform_dispatcher.dart:341:7)
#23     _dispatchPointerDataPacket (dart:ui/hooks.dart:94:31)

Handler: "onTap"
Recognizer:
  TapGestureRecognizer#94dcc

I run:

$ make run FLUTTER_DEVICE=<device>

Where <device> is the device-id my my connected iPhone.

What did I do wrong? 🤔

Upgrade Flutter and Golang versions

Testing building and running `android` project

android

Testing building and running `linux` project

Testing out FFI on Mobile

Overview

Testing the FFI on mobile devices apart of the Flutter Supported Platforms

Platforms

• #6
• #7

Adding tested Flutter Devices in the main README file

Adding a section of Flutter Supported Devices that have been tested against this project and have proved to be working properly.

This should help close this #1