[Flutter/Dart] Support Dart: Use Dart FFI

[hhstore]

Support Dart:

• since i want to use wallet-core in dart.
• so i try to use dart:ffi to make it.
• but i am not quite familiar with wallet-core.
• anyone who wants to help me? or any suggestions on where to start first?
• i would really appreciate it.

my fork:

• https://github.com/better-dart/trustwallet-core/tree/dart/ffi-base-on-v2.3.9
• dev-branch: dart/ffi-base-on-v2.3.9
• i will add dart:ffi to support dart here.

dart ffi:

• https://dart.dev/guides/libraries/c-interop
• https://flutter.dev/docs/development/platform-integration/c-interop

libs:

• https://github.com/dart-lang/ffi
• https://github.com/dart-lang/ffigen
  • a tool to auto gen binding codes.

usage: c++ with ffi

• https://github.com/dart-lang/tflite_native

Maybe these are the things I need?

docs:

• binding: https://developer.trustwallet.com/wallet-core/developing-the-library/building

• ios: https://developer.trustwallet.com/wallet-core/integration-guide/ios-guide

 pod 'TrustWalletCore'

• android: https://developer.trustwallet.com/wallet-core/integration-guide/android-guide

jni load:

init {
    System.loadLibrary("TrustWalletCore")
}

• go: https://developer.trustwallet.com/wallet-core/integration-guide/server-side

*.h

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/include/TrustWalletCore/TWHDWallet.h

jni:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/jni/cpp/TWJNI.h

gen proto ?

• https://github.com/trustwallet/wallet-core/blob/e8ff9c7106/tools/generate-files

• pb: https://github.com/trustwallet/wallet-core/blob/e8ff9c7106/src/proto/Ethereum.proto

iOS:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/tools/ios-build

Android:

• https://github.com/trustwallet/wallet-core/blob/81a5b234f6/tools/android-build

code gen:

• https://github.com/trustwallet/wallet-core/blob/99af2f62cd/codegen/lib/code_generator.rb

[hhstore]

The latest progress:

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/README.md
• the dart binding file has been successfully generated, and I am testing it.

pubspec.yaml

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/pubspec.yaml

dart binding file:

• https://github.com/better-dart/wallet-core/blob/dart%2Fffi-base-on-v2.3.9/dart/lib/wallet_core_bindings.dart#L7
• this is the generate binding codes.

[hewigovens]

Are you building dart bindings on top of existing iOS/android lib?

[hhstore]

Are you building dart bindings on top of existing iOS/android lib?

• i think i need iOS/Android dynamic library.
• but i not sure, if Android wallet-core.aar is what i needed? or i should build a dynamic library by myself?
• from this doc, https://developer.trustwallet.com/wallet-core/developing-the-library/releasing
  • https://bintray.com/trust/wallet-core/com.trustwallet.wallet-core
• i find android wallet-core.aar file.
• i still working on how to add android wallet-core.aar to my flutter project and call it via dart binding codes, since the docs related to dart:ffi are really rare.
• in this process, I encountered some problems, some errors. i'm working on it.

about dart ffi usage:

• https://flutter.dev/docs/development/platform-integration/c-interop#step-3-load-the-code-using-the-ffi-library

rust + ffi + flutter:

• i find a rust ffi binding usage here: https://github.com/Hentioe/mikack-ffi
  • https://github.com/Hentioe/mikack-ffi/blob/master/Makefile#L42
• this a rust ffi usage, use for a flutter project. i think i'm going to do something like this.

[hewigovens]

Hey, what's status of dart binding? I think you can skip building process and unzip aar from here https://bintray.com/trust/wallet-core/com.trustwallet.wallet-core/2.4.1

[jayateertha043]

Hey,
I was also looking for the same integration ,if you managed to integrate trust wallet into flutter kindly let me know

Thanks and regards
Jayateertha G

[jayateertha043]

Can't we just put the aar files into android/lib/ folder and interact with them using method channel ?

[hhstore]

@hewigovens

• It's not going well.
• I encountered some native-related problems, which I can't solve at the moment.
• Due to time constraints, I am temporarily using the dart native library instead.
• However, I will still consider replacing it with trustwallet-core.
• I would still try the FFI or channel method to bind the trustwallet-core.

Follow up:

• The latest developments will be synchronized in the following 2 projects.

use FFI:

• https://github.com/better-dart/trustwallet-core

use Platform Channels:

• https://github.com/better-dart/flutter_trust_wallet_core
• channel method

[hhstore]

@jayateertha043

• Using the channel method is a good choice.
• To use the channel method, you need to write Android/iOS native codes, but I'm not familiar with native.
• If you are familiar with native coding, you can try it.