Rust WebAssembly运行时wasm-tokio的使用:基于Tokio的异步WASM插件库开发指南
Rust WebAssembly运行时wasm-tokio的使用:基于Tokio的异步WASM插件库开发指南
安装
运行以下Cargo命令在您的项目目录中:
cargo add wasm-tokio
或者在您的Cargo.toml中添加以下行:
wasm-tokio = "0.6.0"
完整示例demo
以下是一个基于wasm-tokio的异步WASM插件库开发完整示例:
use wasm_tokio::Runtime;
use tokio::time::{sleep, Duration};
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
// 创建WASM运行时实例
let runtime = Runtime::new()?;
// 加载WASM模块
let wasm_bytes = include_bytes!("../path/to/your/plugin.wasm");
let module = runtime.load_module(wasm_bytes).await?;
// 实例化WASM模块
let instance = module.instantiate().await?;
// 调用WASM导出函数
if let Some(process_data) = instance.get_func::<i32, i32>("process_data") {
let input = 42;
let result = process_data.call_async(input).await?;
println!("WASM处理结果: {}", result);
}
// 异步任务示例
let task = tokio::spawn(async move {
sleep(Duration::from_secs(1)).await;
println!("异步任务完成");
});
task.await?;
Ok(())
}
// WASM插件示例代码 (编译为WASM)
#[no_mangle]
pub extern "C" fn process_data(input: i32) -> i32 {
// 简单的数据处理逻辑
input * 2 + 1
}
配置说明
在Cargo.toml中添加以下配置:
[package]
name = "wasm-plugin-example"
version = "0.1.0"
edition = "2021"
[dependencies]
wasm-tokio = "0.6.0"
tokio = { version = "1.0", features = ["full"] }
[lib]
crate-type = ["cdylib"] # 用于编译WASM插件
[package.metadata.wasm-pack.profile.release]
wasm-opt = false
构建命令
构建主机应用程序:
cargo build
构建WASM插件:
cargo build --target wasm32-unknown-unknown --release
功能特性
- 基于Tokio的异步WASM运行时
- 支持异步函数调用
- 内存安全管理
- 模块热加载
- 错误处理机制
这个示例展示了如何使用wasm-tokio创建和管理异步WASM插件,包括模块加载、实例化和函数调用等基本操作。
完整示例代码
以下是一个完整的基于wasm-tokio的异步WASM插件开发示例:
主机应用程序 (main.rs):
use wasm_tokio::Runtime;
use tokio::fs::read;
#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {
// 创建WASM运行时实例
let runtime = Runtime::new()?;
// 读取WASM文件
let wasm_bytes = read("./target/wasm32-unknown-unknown/release/plugin.wasm").await?;
// 加载WASM模块
let module = runtime.load_module(&wasm_bytes).await?;
// 实例化WASM模块
let instance = module.instantiate().await?;
// 调用WASM导出函数
if let Some(process_data) = instance.get_func::<i32, i32>("process_data") {
let input = 42;
let result = process_data.call_async(input).await?;
println!("WASM处理结果: {}", result);
}
Ok(())
}
WASM插件库 (lib.rs):
// 声明WASM导出函数
#[no_mangle]
pub extern "C" fn process_data(input: i32) -> i32 {
// 数据处理逻辑 - 将输入值乘以2并加1
input * 2 + 1
}
// 可选的辅助函数
#[no_mangle]
pub extern "C" fn add_numbers(a: i32, b: i32) -> i32 {
a + b
}
Cargo.toml配置:
[package]
name = "wasm-plugin-host"
version = "0.1.0"
edition = "2021"
[dependencies]
wasm-tokio = "0.6.0"
tokio = { version = "1.0", features = ["full", "fs"] }
# WASM插件的Cargo.toml
[package]
name = "wasm-plugin"
version = "0.1.0"
edition = "2021"
[lib]
crate-type = ["cdylib"]
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