feat(rust): add flutter_rust_bridge

.config/dictionaries/project.dic

@@ -1,6 +1,7 @@
 aarch
 bindgen
 binstall
+bkioshn
 buildkit
 camelcase
 canvaskit
@@ -46,6 +47,7 @@ gopls
 gosec
 graphviz
 idents
+JDBC
 jorm
 jormungandr
 junitreport
@@ -89,6 +91,7 @@ PYTHONDONTWRITEBYTECODE
 rankdir
 rivo
 runewidth
+rustc
 rustdoc
 rustdocflags
 rustflags
@@ -122,4 +125,3 @@ xerrors
 xvfb
 zstd
 zstdcat
-JDBC

docs/src/guides/languages/flutter.md

@@ -157,6 +157,39 @@ please follow this [guide](./../../onboarding/index.md).
 It is pretty strait forward for this builder process,
 because as a part of `+build` target we already creating a docker image.
 
+## Enhancing Flutter
+
+### Integrating Flutter with Rust using `flutter_rust_bridge`
+
+The `flutter_rust_bridge` allows you to integrate Rust with Flutter app, while maintaining the rest of the app in
+Dart.
+This can be useful for situations where you need to run complex algorithms, handle data
+processing, or interact with low-level system APIs, but still want to leverage the Flutter ecosystem
+for UI and app management.
+
+Start by creating a new builder where all the necessary setup is done under the `flutter_rust_bridge+builder`,
+then copy the Flutter project that already have `flutter_rust_bridge` setup.
+Refer to <https://cjycode.com/flutter_rust_bridge/> for how to setup the project.
+
+```Earthfile
+builder-frb:
+    FROM flutter_rust_bridge+builder
+    COPY . .
+```
+
+Then generate a binding between Rust and Flutter
+
+```Earthfile
+# Generated necessary files for running Flutter web locally and save it locally.
+code-generator-web:
+    FROM +builder-frb
+    DO flutter_rust_bridge+CODE_GENERATOR_WEB
+
+    SAVE ARTIFACT ./web/pkg AS LOCAL ./example/web/pkg
+    SAVE ARTIFACT ./rust/src/frb_generated.rs AS LOCAL ./rust/src/frb_generated.rs
+    SAVE ARTIFACT ./lib/src AS LOCAL ./lib/src
+```
+
 ## Conclusion
 
 You can see the final `Earthfile`

earthly/flutter/Earthfile

@@ -4,29 +4,47 @@ VERSION 0.8
 
 IMPORT ./installer AS installer
 
-# flutter-src save Flutter source code as artifact.
-flutter-src:
-    FROM busybox
+# TODO(bkioshn): https://github.com/input-output-hk/catalyst-ci/issues/322
+# Install flutter.
+INSTALL_FLUTTER:
+    FUNCTION
     ARG version=3.24.1
     ARG TARGETARCH
 
-    RUN mkdir -p /flutter
+    # Install Flutter
     IF [ "$TARGETARCH" = "amd64" ]
         RUN wget -qO - https://storage.googleapis.com/flutter_infra_release/releases/stable/linux/flutter_linux_$version-stable.tar.xz \
-            | tar -xJ -C /flutter
+            | tar -xJ -C /usr/local
+    ELSE IF [ "$TARGETARCH" = "arm64" ]
+        GIT CLONE --branch $version https://github.com/flutter/flutter.git /usr/local
     ELSE
-        GIT CLONE --branch $version https://github.com/flutter/flutter.git /flutter
+        RUN echo >&2 "unsupported architecture: ${TARGETARCH}"; exit 1
     END
-    SAVE ARTIFACT /flutter flutter
 
+    RUN git config --global --add safe.directory /usr/local/flutter
+    ENV PATH="/usr/local/flutter/bin:/usr/local/flutter/bin/cache/dart-sdk/bin:$HOME/.pub-cache/bin:${PATH}"
+
+    ENV CI="true"
+    RUN flutter config --no-analytics
+    RUN flutter --version
+    RUN flutter doctor -v
+    RUN flutter config --enable-web
+    RUN dart pub global activate melos
+    RUN dart pub global activate junitreport
+    RUN dart pub global activate coverage
+    RUN dart pub global activate combine_coverage
+    RUN dart pub global activate license_checker
+
 # flutter-base installs required tools and packages.
 flutter-base:
     FROM debian:bookworm-20240513-slim
 
     ENV DEBIAN_FRONTEND=noninteractive
 
     RUN apt-get update --fix-missing
-    RUN apt-get install -y apt-utils git curl gzip unzip bzip2 bash jq gpg lcov
+    RUN apt-get install -y apt-utils git curl gzip unzip bzip2 bash jq gpg lcov tar wget xz-utils
+
+    DO +INSTALL_FLUTTER
 
     WORKDIR frontend
 
@@ -37,21 +55,6 @@ flutter-base:
     ARG edge_package_release = 1
     DO installer+INSTALL_EDGE_LINUX64 --edge_version=$edge_version --edge_package_release=$edge_package_release
 
-    COPY +flutter-src/flutter /usr/local
-    ENV PATH="/usr/local/flutter/bin:/usr/local/flutter/bin/cache/dart-sdk/bin:$HOME/.pub-cache/bin:${PATH}"
-    # Flutter prints warnings when used by root user but omits them if has CI env flag found.
-    # script: https://github.com/flutter/flutter/blob/master/bin/internal/shared.sh#L214
-    ENV CI="true"
-    RUN flutter config --no-analytics
-    RUN flutter --version
-    RUN flutter doctor -v
-    RUN flutter config --enable-web
-    RUN dart pub global activate melos
-    RUN dart pub global activate junitreport
-    RUN dart pub global activate coverage
-    RUN dart pub global activate combine_coverage
-    RUN dart pub global activate license_checker
-
 # test-flutter-base-amd64 : installs required tools and packages for amd64.
 test-flutter-base-amd64:
     BUILD --platform=linux/amd64 +flutter-base

earthly/flutter_rust_bridge/Earthfile

@@ -0,0 +1,38 @@
+VERSION 0.8
+
+IMPORT ../flutter AS flutter-ci
+IMPORT ../rust AS rust-ci
+
+# This will be refactored in the future
+# TODO(bkioshn): https://github.com/input-output-hk/catalyst-ci/issues/322
+# builder: Setup necessary tools for `flutter_rust_bridge`
+builder:
+    FROM debian:stable-slim
+
+    WORKDIR /work
+
+    RUN apt-get update \
+        && apt-get install -y \
+        apt-utils \
+        wget \
+        tar \
+        xz-utils \
+        git \
+        build-essential \
+        curl \
+        unzip 
+
+    DO flutter-ci+INSTALL_FLUTTER
+    DO rust-ci+INSTALL_RUST
+    DO rust-ci+INSTALL_TOOLS
+
+# Generated necessary files for running Flutter web.
+CODE_GENERATOR_WEB:
+    FUNCTION 
+
+    RUN flutter_rust_bridge_codegen generate --default-external-library-loader-web-prefix=/assets/packages/catalyst_key_derivation/assets/js/
+    RUN flutter_rust_bridge_codegen build-web
+
+    RUN mkdir -p assets/js && cp -rf ./web/pkg/* assets/js/
+     # Don't want this gitignore file.
+    RUN rm -rf ./assets/js/.gitignore

earthly/rust/Earthfile

@@ -112,7 +112,8 @@ COPY_TOOL:
     FUNCTION
 
     ARG --required tool
-    COPY rust-tools+tool-$tool/$tool $CARGO_HOME/bin/$tool
+    ARG bin = $tool
+    COPY rust-tools+tool-$tool/$bin $CARGO_HOME/bin/$bin
 
 
 # rust-base-plus-tools : Add all tools we use for rust builds to the base builder image.
@@ -360,4 +361,91 @@ REMOVE_SOURCE_FINGERPRINTS:
                     find . -maxdepth 1 -regex "\./$source_lib-[^-]+" -exec bash -c 'echo "deleting $(readlink -f {})"; rm -rf {}' \; ; \
                 done \
             fi; \
-         done;
+         done;
+
+# TODO(bkioshn): https://github.com/input-output-hk/catalyst-ci/issues/322
+# Installing Rust
+# Code reference from [rust1.81.0-slim-bookworm](https://github.com/rust-lang/docker-rust/blob/63f877a36f8ba9d9b4b35cd49df3327264510886/stable/bookworm/slim/Dockerfile)
+INSTALL_RUST:
+    FUNCTION
+
+    ARG TARGETARCH
+
+    ENV RUSTUP_HOME=/usr/local/rustup 
+    ENV CARGO_HOME=/usr/local/cargo 
+    ENV PATH=/usr/local/cargo/bin:$PATH 
+    ENV RUST_VERSION=1.81.0
+
+    IF [ "$TARGETARCH" = "amd64" ]
+        LET PLATFORM = "x86_64-unknown-linux-gnu"
+        LET RUSTUP_SHA = "6aeece6993e902708983b209d04c0d1dbb14ebb405ddb87def578d41f920f56d"
+    ELSE IF [ "$TARGETARCH" = "arm64" ]
+        LET PLATFORM = "aarch64-unknown-linux-gnu"
+        LET RUSTUP_SHA = "1cffbf51e63e634c746f741de50649bbbcbd9dbe1de363c9ecef64e278dba2b2"
+    ELSE
+        RUN echo >&2 "unsupported architecture: ${TARGETARCH}"; exit 1
+    END
+
+    LET URL = "https://static.rust-lang.org/rustup/archive/1.27.1/${PLATFORM}/rustup-init"
+    RUN wget $URL && echo "${RUSTUP_SHA} *rustup-init" | sha256sum -c - \
+        && chmod +x rustup-init \
+        && ./rustup-init -y --no-modify-path --profile minimal --default-toolchain $RUST_VERSION --default-host $PLATFORM \
+        && rm rustup-init \
+        && chmod -R a+w $RUSTUP_HOME $CARGO_HOME \
+        && rustup --version \
+        && cargo --version \
+        && rustc --version \
+        && rm -rf /var/lib/apt/lists/*
+
+      # Make sure we have cargo.
+    RUN rustup component add cargo
+
+    # Make sure we have the clippy linter.
+    RUN rustup component add clippy
+
+    # Needed to generate code coverage.
+    RUN rustup component add llvm-tools-preview
+
+    # Install a nightly toolchain which matches.
+    RUN rustup toolchain install nightly --component miri --component rust-src --component rustfmt --component clippy --component cargo
+
+    # Ensure we have all the necessary targets
+    RUN rustup target add wasm32-unknown-unknown
+    RUN rustup target add wasm32-wasip1
+    # RUN rustup target add wasm32-wasip2 # wasm32-wasip2 not yet available in stable - Try again in 1.82
+    RUN rustup target add x86_64-unknown-linux-gnu
+    RUN rustup target add x86_64-apple-darwin
+    RUN rustup target add x86_64-pc-windows-gnu
+    RUN rustup target add aarch64-unknown-linux-gnu
+    RUN rustup target add aarch64-apple-darwin
+
+    RUN rustup target add wasm32-unknown-unknown --toolchain nightly
+    RUN rustup target add wasm32-wasip1 --toolchain nightly 
+    RUN rustup target add wasm32-wasip2 --toolchain nightly
+    RUN rustup target add x86_64-unknown-linux-gnu --toolchain nightly
+    RUN rustup target add x86_64-apple-darwin --toolchain nightly
+    RUN rustup target add x86_64-pc-windows-gnu --toolchain nightly
+    RUN rustup target add aarch64-unknown-linux-gnu --toolchain nightly
+    RUN rustup target add aarch64-apple-darwin --toolchain nightly
+
+# Install necessary tools for Rust.
+INSTALL_TOOLS:
+    FUNCTION
+    # Install cargo-binstall so we can speed up tool installation.
+    DO rust-tools+CARGO_BINSTALL_INSTALL
+
+    DO +COPY_TOOL --tool="cargo-nextest"
+    DO +COPY_TOOL --tool="cargo-machete"
+    DO +COPY_TOOL --tool="refinery"
+    DO +COPY_TOOL --tool="cargo-deny"
+    DO +COPY_TOOL --tool="cargo-modules"
+    DO +COPY_TOOL --tool="cargo-depgraph"
+    DO +COPY_TOOL --tool="cargo-llvm-cov"
+    DO +COPY_TOOL --tool="wasm-tools"
+    DO +COPY_TOOL --tool="cargo-expand"
+    DO +COPY_TOOL --tool="wit-bindgen"
+    DO +COPY_TOOL --tool="cargo-sweep"
+    DO +COPY_TOOL --tool="cargo-component"
+    DO +COPY_TOOL --tool="wasm-pack"
+    DO +COPY_TOOL --tool="flutter-rust-bridge-codegen" --bin="flutter_rust_bridge_codegen"
+

earthly/rust/tools/Earthfile

@@ -82,3 +82,6 @@ tool-cargo-component:
 
 tool-wasm-pack:
     DO +CARGO_BINSTALL --package=wasm-pack --version=0.13.0
+
+tool-flutter-rust-bridge-codegen:
+    DO +CARGO_BINSTALL --package=flutter_rust_bridge_codegen --version=2.5.1 --executable="flutter_rust_bridge_codegen"

examples/flutter/example/Earthfile

@@ -1,6 +1,7 @@
 VERSION 0.8
 
 IMPORT ../../../earthly/flutter AS flutter-ci
+IMPORT ../../../earthly/flutter_rust_bridge AS flutter_rust_bridge
 
 # To see more available functions, navigate to earthly/flutter/Earthfile.
 
@@ -39,3 +40,18 @@ build-web:
     ARG --required SENTRY_DSN
 
     DO flutter-ci+BUILD_WEB --WORKDIR=$WORKDIR --TARGET=$TARGET --SENTRY_DSN=$SENTRY_DSN
+
+# -----------------flutter_rust_bridge-----------------
+
+builder-frb:
+    FROM flutter_rust_bridge+builder
+    COPY . .
+
+# Generated necessary files for running Flutter web locally and save it locally.
+code-generator-web:
+    FROM +builder-frb
+    DO flutter_rust_bridge+CODE_GENERATOR_WEB
+
+    SAVE ARTIFACT ./assets/js AS LOCAL ./assets/js
+    SAVE ARTIFACT ./rust/src/frb_generated.rs AS LOCAL ./rust/src/frb_generated.rs
+    SAVE ARTIFACT ./lib/src AS LOCAL ./lib/src

examples/flutter/example/flutter_rust_bridge.yaml

@@ -0,0 +1,3 @@
+rust_input: crate::api
+rust_root: rust/
+dart_output: lib/src/rust

examples/flutter/example/integration_test/simple_test.dart

@@ -0,0 +1,13 @@
+import 'package:flutter_test/flutter_test.dart';
+import 'package:example/main.dart';
+import 'package:example/src/rust/frb_generated.dart';
+import 'package:integration_test/integration_test.dart';
+
+void main() {
+  IntegrationTestWidgetsFlutterBinding.ensureInitialized();
+  setUpAll(() async => await RustLib.init());
+  testWidgets('Can call rust function', (WidgetTester tester) async {
+    await tester.pumpWidget(const MyApp());
+    expect(find.textContaining('Result: `Hello, Tom!`'), findsOneWidget);
+  });
+}