Starter project for Flutter plugins willing to access native and synchronous rust code using FFI

Last update: May 21, 2022

Flutter Rust FFI Template

This project is a Flutter Plugin template.

It provides out-of-the box support for cross-compiling native Rust code for all available iOS and Android architectures and call it from plain Dart using Foreign Function Interface.

This template provides first class FFI support, the clean way.

  • No Swift/Kotlin wrappers
  • No message passing
  • No async/await on Dart
  • Write once, use everywhere
  • No garbage collection
  • Mostly automated development
  • No need to export aar bundles or .framework's

Getting started

Write your native code

Edit your code within rust/src/lib.rs and add any dependencies you need.

Make sure to annotate your exported functions with #[no_mangle] and pub extern so the function names can be matched from Dart.

Returning strings or structs may require using unsafe blocks. Returned strings or structs will need to be free'd from Dart.

Compile the library

  • Make sure that the Android NDK is installed
    • You might also need LLVM from the SDK manager
  • Ensure that the env variable $ANDROID_NDK_HOME points to the NDK base folder
    • It may look like /Users/brickpop/Library/Android/sdk/ndk-bundle on MacOS
    • And look like /home/brickpop/dev/android/ndk-bundle on Linux
  • On the rust folder:
    • Run make to see the available actions
    • Run make init to install the Rust targets
    • Run make all to build the libraries and the .h file
  • Update the name of your library in Cargo.toml
    • You'll need to update the symlinks to target the new file names. See iOS and Android below.

Generated artifacts:

  • Android libraries
    • target/aarch64-linux-android/release/libexample.so
    • target/armv7-linux-androideabi/release/libexample.so
    • target/i686-linux-android/release/libexample.so
    • target/x86_64-linux-android/release/libexample.so
  • iOS library
    • target/universal/release/libexample.a
  • Bindings header
    • target/bindings.h

Reference the shared objects

iOS

Ensure that ios/mylib.podspec includes the following directives:

...
   s.source           = { :path => '.' }
+  s.public_header_files = 'Classes**/*.h'
   s.source_files = 'Classes/**/*'
+  s.static_framework = true
+  s.vendored_libraries = "**/*.a"
   s.dependency 'Flutter'
   s.platform = :ios, '8.0'
...

On flutter/ios, place a symbolic link to the libexample.a file

$ cd flutter/ios
$ ln -s ../rust/target/universal/release/libexample.a .

Append the generated function signatures from rust/target/bindings.h into flutter/ios/Classes/MylibPlugin.h

$ cd flutter/ios
$ cat ../rust/target/bindings.h >> Classes/MylibPlugin.h

In our case, it will append char *rust_greeting(const char *to); and void rust_cstr_free(char *s);

NOTE: By default, XCode will skip bundling the libexample.a library if it detects that it is not being used. To force its inclusion, add dummy invocations in SwiftMylibPlugin.swift that use every single native function that you use from Flutter:

...
  public func dummyMethodToEnforceBundling() {
    rust_greeting("...");
    compress_jpeg_file("...");
    compress_png_file("...");
    // ...
    // This code will force the bundler to use these functions, but will never be called
  }
}

If you won't be using Flutter channels, the rest of methods can be left empty.

Note: Support for avmv7, armv7s and i386 is deprecated. The targets can still be compiled with Rust 1.41 or earlier and by uncommenting the make init line on rust/makefile

Android

Similarly as we did on iOS with libexample.a, create symlinks pointing to the binary libraries on rust/target.

You should have the following structure on flutter/android for each architecture:

src
└── main
    └── jniLibs
        ├── arm64-v8a
        │   └── [email protected] -> ../../../../../rust/target/aarch64-linux-android/release/libexample.so
        ├── armeabi-v7a
        │   └── [email protected] -> ../../../../../rust/target/armv7-linux-androideabi/release/libexample.so
        ├── x86
        │   └── [email protected] -> ../../../../../rust/target/i686-linux-android/release/libexample.so
        └── x86_64
            └── [email protected] -> ../../../../../rust/target/x86_64-linux-android/release/libexample.so

As before, if you are not using Flutter channels, the methods within android/src/main/kotlin/org/mylib/mylib/MylibPlugin.kt can be left empty.

Exposing a Dart API to use the bindings

To invoke the native code: load the library, locate the symbols and typedef the Dart functions. You can automate this process from rust/target/bindings.h or do it manually.

Automatic binding generation

To use ffigen, add the dependency in pubspec.yaml.

 dev_dependencies:
   flutter_test:
     sdk: flutter
+  ffigen: ^1.2.0

Also, add the following lines at the end of pubspec.yaml:

ffigen:
  output: lib/bindings.dart
  headers:
    entry-points:
    - rust/target/bindings.h
  name: GreeterBindings
  description: Dart bindings to call mylib functions

On MacOS:

brew install llvm
flutter pub run ffigen:setup -I/usr/local/opt/llvm/include -L/usr/local/opt/llvm/lib

On Linux:

sudo apt-get install -y clang libclang-dev
flutter pub run ffigen:setup

Generate lib/bindings.dart:

flutter pub run ffigen

Finally, use the generated GreetingBindings class. An example wrapper is available here.

Manual bindings

Load the library:

final DynamicLibrary nativeExampleLib = Platform.isAndroid
    ? DynamicLibrary.open("libexample.so")   // Load the dynamic library on Android
    : DynamicLibrary.process();              // Load the static library on iOS

Find the symbols we want to use, with the appropriate Dart signatures:

final Pointer<Utf8> Function(Pointer<Utf8>) rustGreeting = nativeExampleLib
    .lookup<NativeFunction<Pointer<Utf8> Function(Pointer<Utf8>)>>("rust_greeting")
    .asFunction();

final void Function(Pointer<Utf8>) freeGreeting = nativeExampleLib
    .lookup<NativeFunction<Void Function(Pointer<Utf8>)>>("rust_cstr_free")
    .asFunction();

Call them:

// Prepare the parameters
final name = "John Smith";
final Pointer<Utf8> namePtr = Utf8.toUtf8(name);
print("- Calling rust_greeting with argument:  $namePtr");

// Call rust_greeting
final Pointer<Utf8> resultPtr = rustGreeting(namePtr);
print("- Result pointer:  $resultPtr");

final String greetingStr = Utf8.fromUtf8(resultPtr);
print("- Response string:  $greetingStr");

When we are done using greetingStr, tell Rust to free it, since the Rust implementation kept it alive for us to use it.

freeGreeting(resultPtr);

More information

GitHub

https://github.com/brickpop/flutter-rust-ffi
Comments
  • 1. Works on debug, but not on release

    Hello and thanks for the template and article.

    I'm trying to use the produced .a file as a static library, I'm including the .h on the bridge header file and everything works on debug on a real-device and emulator.

    However when I archive and test from Testflight I get a grey screen, if I comment out all the Rust invocations from Flutter, the App works as expected. Is there something specific that needs to be done in order for the library to be included? I have it on embedded libraries and frameworks. Not sure what else to do.

    Thanks in advance!

    Reviewed by netgfx at 2020-09-25 10:34
  • 2. Thank you

    Thank you for solving this ! I've been working hard on this too and I don't think I would have found the trick of adding a dummy function to my swift library. That's a weird behavior, don't you think there is something we can do ? Maybe the Dart team can have a look at this.

    For the android part I prefer to use cargo-gradle because it rebuilds when my Rust code changes you should definitely check it out.

    Reviewed by sachaarbonel at 2020-03-04 19:43
  • 3. IOS release Failed to lookup symbol (dlsym(RTLD_DEFAULT, test_func): symbol not found)

    It was ok in debug mode, but failed in release mode.

    Failed to lookup symbol (dlsym(RTLD_DEFAULT, test_func): symbol not found)
    #0      DynamicLibrary.lookup (dart:ffi-patch/ffi_dynamic_library_patch.dart:33)
    
    Reviewed by hustxiaoc at 2020-04-30 03:13
  • 4. How to access database in rust flutter

    Rust has few libraries that allows database access like sqlite and also native storat. Is it possible to do it with rust and access rust function via flutter?

    Basically I want push as much as on Rust side as I'm not that happy with flexibility of dart language.

    BTW thanks for awesome template. :-)

    Reviewed by kunjee17 at 2020-12-27 13:15
  • 5. adjust build targets

    Thanks for the template and clear explaination on Medium!

    This PR adjusts (adds and removes) some targets

    Android

    Add support for x86_64_linux, closes #3

    iOS

    remove 32 bits target: i386, armb7s, armv7 targets

    because:

    From 1.42.0 rust dropped 32-bit apple target support), the latest version for building ios target is 1.41.1.

    In addition to that, as of Xcode 10 (10A255) - September 17, 2018, i386 architecture is no longer supported.

    References of ios archs and devices could be refer here.

    Reviewed by hanwencheng at 2020-04-19 21:59
  • 6. x86_64 arch target

    Why do you left x86_64, until now flutter release support arm64, arm arches but in latest they added x86_64 for latest target, so it is better to add x86_64 target also.

    Reviewed by canewsin at 2020-03-10 06:54
  • 7. My generated dart file is getting errors like missing_const_final_var_or_type and implicit_this_reference_in_initializer

    Hi!

    Copied this example. My pubspec:

    dependencies:
      flutter:
        sdk: flutter
      ffi: ^1.1.2
    
    dev_dependencies:
      flutter_test:
        sdk: flutter
      ffigen: 4.1.3
    
    ffigen:
      name: NativeLibrary
      description: Bindings to `headers/example.h`.
      output: 'lib/generated_bindings.dart'
      headers:
        entry-points:
          - 'rust/bindings.h'
    

    My header is only 1 row and is: void start_application(void);. So when I run flutter pub run ffigen it creates a dart file with errors like: Variables must be declared using the keywords 'const', 'final', 'var' or a type name. Try adding the name of the type of the variable or the keyword 'var'. and then The instance member '_start_applicationPtr' can't be accessed in an initializer. Try replacing the reference to the instance member with a different expression

    Any clue why I get these errors?

    Reviewed by Cronnay at 2022-02-13 00:35
  • 8. Macos integration

    (Copy of macos/README.md)

    1. Run flutter create --platforms=macos .
    2. Remove unnecessary new files created in step 2
    3. Add some lines from ios/mylib.podspec to macos/mylib.podspec
    4. Replace macos/Classes/* with ios/Classes/*
    5. Few more changes in source code to compatibility with new ffi and ffigen

    If you start flutter run at this point you will get something like that

    ══╡ EXCEPTION CAUGHT BY WIDGETS LIBRARY ╞═══════════════════════════════════════════════════════════
    The following ArgumentError was thrown attaching to the render tree:
    Invalid argument(s): Failed to lookup symbol (dlsym(RTLD_DEFAULT, rust_greeting): symbol not found)
    

    You can try changing example/macos/Podfile to resolve this error, but there is one more recipe to do that.

    Reviewed by olegnet at 2021-09-25 09:56
  • 9. Pipe Rust standard input/output to Dart

    Hi, I am asking myself if I can use this template to call native rust functions and then write to the standard input of the rust library as well as read from its standard output. Do you know if this is possible? I am asking because I am trying to integrate a UCI Chess Engine (Stockfish, more specifically its Rust port called Rustfish) into a Flutter App and therefore I need to be able to write to/ read from the standard input/ output to send UCI commands and receive their answers. I would be very happy if you could help me here.

    Reviewed by sengerts at 2021-01-09 13:06
  • 10. Not able to use the template for integrating a bigger rust library

    First of all, thank you for this nice template. I am currently trying to integrate the Stockfish chess engine into Flutter using a Rust port of Stockfish (https://github.com/syzygy1/Rustfish) together with your template. However, I am not able to get it running at the moment and I don't know what the problem is.

    The lib.rs file I use for this template is the Rustfish source code bundled into a single file (adjusting the function signature of the main function I wand to call as stated in the readme of your template). The bundled rust library works fine as it is but after integrating it into flutter using the template, it will only crash when calling the main function of the library. All I get is the following error stacktrace where I sadly can't make anything out of:

    I/flutter (14269): - Mylib bindings found 👍
    I/flutter (14269):   DynamicLibrary: handle=0xbea78c8197f77fe5
    I/flutter (14269): - Calling native rustfish test
    I/flutter (14269): - Executed
    I/flutter (14269): - Calling native rustfish main
    F/libc    (14269): Fatal signal 6 (SIGABRT), code -6 (SI_TKILL) in tid 14318 (1.ui), pid 14269 (b.mylib_example)
    *** *** *** *** *** *** *** *** *** *** *** *** *** *** *** ***
    Build fingerprint: ****
    Revision: '0'
    ABI: 'arm64'
    Happend: 'Sat Nov 28 18:46:14 2020
    '
    SYSVMTYPE: Art
    APPVMTYPE: Art
    pid: 14269, tid: 14318, name: 1.ui  >>> org.mylib.mylib_example <<<
    signal 6 (SIGABRT), code -6 (SI_TKILL), fault addr --------
        x0  0000000000000000  x1  00000000000037ee  x2  0000000000000006  x3  0000000000000008
        x4  00000070e6f5f1c8  x5  00000070e6f5f1c8  x6  00000070e6f5f1c8  x7  00000070e6f5f000
        x8  0000000000000083  x9  539e262590de5120  x10 0000000000000000  x11 fffffffc7ffffbdf
        x12 0000000000000001  x13 0000000000002710  x14 0000000051eb851f  x15 0000000000000064
        x16 00000071942f12c0  x17 000000719422fe34  x18 0000000000000001  x19 00000000000037bd
        x20 00000000000037ee  x21 00000070e7019dc0  x22 00000070e70eda70  x23 00000070e6ff8208
        x24 0000000000000001  x25 0000000000000000  x26 0000000000011803  x27 0000000000015ac4
        x28 fffffffffffffffe  x29 00000070f3bfdc30
        sp  00000070f3bfdbf0  lr  0000007194224960  pc  0000007194224988
    backtrace:
        #00 pc 0000000000022988  /system/lib64/libc.so (abort+116)
        #01 pc 000000000006a72c  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #02 pc 0000000000067dc4  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #03 pc 0000000000068d3c  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #04 pc 0000000000068cc4  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #05 pc 0000000000068840  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #06 pc 0000000000066fec  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #07 pc 0000000000068808  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #08 pc 000000000007b988  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #09 pc 000000000007b95c  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #10 pc 00000000000496b0  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #11 pc 00000000000492f0  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so
        #12 pc 0000000000030784  /data/app/org.mylib.mylib_example-u95oBwvD6alTIL-bUUZg3g==/lib/arm64/librustfish.so (main+188)
        #13 pc 0000000000005564  <anonymous:00000070f2a00000>
    

    The dart file where I try to call the native rust code is the following:

    import 'dart:ffi';
    import 'dart:io';
    
    ///////////////////////////////////////////////////////////////////////////////
    // Typedef's
    ///////////////////////////////////////////////////////////////////////////////
    
    typedef RustMainFunc = void Function();
    typedef RustMainFuncNative = Void Function();
    
    typedef RustTestFunc = void Function();
    typedef RustTestFuncNative = Void Function();
    
    ///////////////////////////////////////////////////////////////////////////////
    // Load the library
    ///////////////////////////////////////////////////////////////////////////////
    
    final DynamicLibrary nativeRustfishLib = Platform.isAndroid
        ? DynamicLibrary.open("librustfish.so")
        : DynamicLibrary.process();
    
    ///////////////////////////////////////////////////////////////////////////////
    // Locate the symbols we want to use
    ///////////////////////////////////////////////////////////////////////////////
    
    final RustMainFunc rustMain = nativeRustfishLib
      .lookup<NativeFunction<RustMainFuncNative>>("main")
      .asFunction();
    
    final RustTestFunc rustTest = nativeRustfishLib
        .lookup<NativeFunction<RustTestFuncNative>>("test")
        .asFunction();
    
    ///////////////////////////////////////////////////////////////////////////////
    // HANDLERS
    ///////////////////////////////////////////////////////////////////////////////
    
    String nativeRustfishMain() {
      if (nativeRustfishLib == null)
        return "ERROR: The native rustfish library is not initialized 🙁";
    
      print("- Mylib bindings found 👍");
      print("  ${nativeRustfishLib.toString()}"); // Instance info
    
      print("- Calling native rustfish test");
      // The actual native call
      rustTest(); // working dummy method call
      print("- Executed");
    
      print("- Calling native rustfish main");
      // The actual native call
      rustMain(); // crashing
      print("- Executed");
    
      return "Success";
    }
    

    I would be very glad about any king of help on setting this up.

    Reviewed by sengerts at 2020-11-28 18:05
  • 11. Could you write a similar article on how to use Golang and Flutter together for desktop?

    I have been trying to setup a project to use Flutter and Golang together for macOS.

    I followed two of your articles https://medium.com/stack-me-up/meet-the-coolest-tech-marriage-flutter-go-369cf11367c9 and https://medium.com/flutter-community/using-ffi-on-flutter-plugins-to-run-native-rust-code-d64c0f14f9c2 but unfortunately I could not get the setup happen.

    I got lost at macOS bundle security and dylib linking using xcode.

    How do I expose the golang native functions into flutter app for desktop? Could you write a similar article on how to use Golang and Flutter together for desktop or any pointers will be appreciated.

    Reviewed by ganeshrvel at 2020-07-23 09:23
  • 12. Add linux compatibility

    Is there some way to generate linux bindings, I'm building for linux arm64 and I need to access my rust code. I'm building a dbus wrapper if I can't but I'd like to access it directly.

    Reviewed by Taha-Firoz at 2022-01-27 09:04
  • 13. Use `flutter_rust_bridge`, the high-level memory-safe binding generator, to avoid manipulating with pointers manually to enhance this library

    Hi thanks for this wonderful starter! As shown in the sample code of this repo, we have to manually write down allocations/frees for pointers such as Strings. That is still quite error-prone and cumbersome. So maybe we can use flutter_rust_bridge, which will automatically generate all such bindings.

    Reviewed by fzyzcjy at 2021-10-26 00:47
  • 14. Dart <-> Rust automated interface generation

    This guy made a very very very good Dart<->Flutter FFI automation/generation, but the project is Sponsorware:

    https://github.com/thlorenz/rid-examples

    I just wanted to make it more visible to more people can sponsor it and thus make it open source. Maybe people from this repo can give him a sponsorship :)

    Reviewed by lattice0 at 2021-07-05 05:40
  • 15. note: ld: error: unable to find library -lgcc

    when i use make all = note: ld: error: unable to find library -lgcc clang-12: error: linker command failed with exit code 1 (use -v to see invocation)

    error: aborting due to previous error

    error: could not compile example-rs

    To learn more, run the command again with --verbose. make: *** [target/aarch64-linux-android/release/libexample.so] Error 101

    Reviewed by xiaoheiai4719 at 2021-06-28 13:14
  • 16. Error on flutter run: "Your app is using an unsupported Gradle project. To fix this problem, create a new project"

    Steps to reproduce

    1. clone the repo.
    2. cd inside
    3. start an eligible x86 Android Emulator
    4. flutter run lib/mylib.dart

    Result

    $ flutter run lib/mylib.dart Using hardware rendering with device Android SDK built for x86. If you notice graphics artifacts, consider enabling software rendering with "--enable-software-rendering". Launching lib/mylib.dart on Android SDK built for x86 in debug mode... Exception: [!] Your app is using an unsupported Gradle project. To fix this problem, create a new project by running flutter create -t app <app-directory> and then move the dart code, assets and pubspec.yaml to the new project.

    Notes

    The same happens after renaming mylib.dart to main.dart and do flutter run.

    flutter doctor

    $ flutter doctor Doctor summary (to see all details, run flutter doctor -v): [✓] Flutter (Channel stable, 2.0.1, on Mac OS X 10.15.4 19E287 darwin-x64, locale de-DE) [✓] Android toolchain - develop for Android devices (Android SDK version 30.0.2) [✓] Xcode - develop for iOS and macOS [✓] Chrome - develop for the web [✓] Android Studio (version 4.0) [✓] VS Code (version 1.55.2) [✓] Connected device (2 available)

    • No issues found!

    Reviewed by florianrein at 2021-04-23 23:21

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flutter_ffi_plugin A new flutter plugin project. FFI # Remove Codesign on macos codesign --remove-signature /usr/local/bin/dart # Install cmake brew

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Aris wasmjsextend - Binding generator for FFI bindings
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Binding generator for FFI bindings. Note: ffigen only supports parsing C headers

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