rustbox_flutter 0.1.3

Cross-platform Flutter FFI bindings for the RustBox proxy runtime, with precompiled native libraries and a typed lifecycle API.

RustBox Flutter

Flutter FFI bindings for the RustBox proxy runtime. The package exposes a small, typed lifecycle API while the proxy engine, protocol implementations, routing, DNS, and platform integration run in Rust.

Native libraries are precompiled and bundled with the package. Applications using RustBox do not need Rust, Cargo, or a C toolchain to build.

Features

• HTTP, SOCKS5, mixed, TUN, transparent, and AnyTLS inbounds
• Direct, block, HTTP, SOCKS5, Shadowsocks, VMess, VLESS, Trojan, AnyTLS, selector, and URL-test outbounds
• Typed start, reload, stop, close, and runtime snapshot operations
• Serialized calls per engine with support for multiple engine instances
• Stable error categories suitable for application UI and recovery logic

Supported platforms

• Android
• iOS
• Windows
• Linux

macOS support is temporarily disabled while its precompiled bridge packaging is stabilized. Web and OHOS are not supported. Consumers need Flutter 3.44 or newer and Dart 3.12 or newer.

Installation

dependencies:
  rustbox_flutter: ^0.1.3

Usage

import 'package:rustbox_flutter/rustbox_flutter.dart';

await RustBox.initialize();
final engine = await RustBoxEngine.create(configToml: config);

try {
  await engine.start();
  final snapshot = await engine.snapshot();
  print(snapshot.state);
  await engine.reload(nextConfig);
  await engine.stop();
} on RustBoxException catch (error) {
  print('${error.kind}: ${error.message}');
} finally {
  await engine.close();
}

configToml uses the same typed RustBox configuration accepted by the CLI. A minimal configuration looks like this:

schema_version = 1

[[inbounds]]
id = "local"
type = "mixed"
listen = "127.0.0.1:2080"

[[outbounds]]
id = "direct"
type = "direct"

[[routes]]
type = "default"
outbound = "direct"

Calls for one engine are serialized. Different engine objects may run concurrently. Always call close when an engine is no longer needed; repeated calls to close are safe.

Errors

Native failures are translated to RustBoxException. Use kind to distinguish invalid configuration, invalid lifecycle state, temporarily unavailable resources, runtime failures, and unexpected bridge failures.

Development

The Rust API is under rust/src/api; generated glue is under rust/src/frb_generated.rs and lib/src/rust. After changing the Rust API:

flutter_rust_bridge_codegen generate
cargo fmt --manifest-path rust/Cargo.toml --package rustbox-flutter-bridge
../../scripts/build/flutter-prebuilt.ps1
cd example
flutter analyze
flutter test integration_test/simple_test.dart -d windows

The Rust runtime, Dart runtime, and code generator use stable flutter_rust_bridge 2.12.0. Upgrade them together, regenerate the bindings, rebuild every native artifact, and validate every supported platform.