use anyhow::{Context, Result, anyhow};
use std::collections::{BTreeMap, HashMap};
use std::sync::{Arc, Mutex};
use std::time::{Duration, Instant};
#[derive(Debug, Clone)]
pub struct WasmModule {
pub name: String,
pub bytecode: Vec<u8>,
pub load_time: Duration,
pub execution_count: u64,
}
#[derive(Debug, Clone, Default)]
pub struct WasmStats {
pub total_executions: u64,
pub total_execution_time: Duration,
pub cache_hit_rate: f64,
pub avg_execution_time: Duration,
pub wasmtime_config: Option<String>,
}
#[derive(Debug)]
pub struct WasmExecutor {
engine: Engine,
modules: Arc<std::sync::Mutex<Vec<WasmModule>>>,
stats: Arc<std::sync::Mutex<WasmStats>>,
}
impl WasmExecutor {
pub fn new() -> Result<Self> {
println!("🚀 初始化Wasmtime引擎...");
let mut config = Config::new();
config.cranelift_debug_verifier(false);
config.parallel_compilation(true);
config.wasm_bulk_memory(true);
config.wasm_simd(true);
config.wasm_threads(true);
config.consume_fuel(true);
let engine: _ = Engine::new(&config)
.context("创建Wasmtime引擎失败")?;
println!("✅ Wasmtime引擎初始化完成");
Ok(Self {
engine,
modules: Arc::new(Mutex::new(std::sync::Mutex::new(Vec::new()))),
stats: Arc::new(Mutex::new(std::sync::Mutex::new(WasmStats {
total_executions: 0,
total_execution_time: Duration::default(),
cache_hit_rate: 0.0,
avg_execution_time: Duration::default(),
wasmtime_config: Some(format!(
"Optimization: SpeedAndSize, Parallel: true, SIMD: true, Threads: true"
)),
}))),
})
}
pub fn load_module(&self, name: &str, bytecode: Vec<u8>) -> Result<()> {
let start: _ = Instant::now();
self.validate_wasm_bytecode(&bytecode)?;
let module: _ = Module::new(&self.engine, &bytecode)
.with_context(|| format!("编译WASM模块 '{}' 失败", name))?;
let mut store = Store::new(&self.engine, ());
store.set_fuel(1_000_000)?;
let instance: _ = Instance::new(&mut store, &module, &[])
.with_context(|| format!("实例化WASM模块 '{}' 失败", name))?;
if let Ok(start_func) = instance.get_typed_func::<(), ()>(&mut store, "_start") {
let _: _ = start_func.call(&mut store, ());
}
let load_time: _ = start.elapsed();
let module_info: _ = WasmModule {
name: name.to_string(),
bytecode,
load_time,
execution_count: 0,
};
let mut modules = self.modules.lock().unwrap();
modules.push(module_info);
println!(
"✅ WASM模块 '{}' 加载完成，耗时 {:?}",
name, load_time
);
Ok(())
}
fn validate_wasm_bytecode(&self, bytecode: &[u8]) -> Result<()> {
if bytecode.len() < 8 {
return Err(anyhow!("WASM字节码太短"));
}
if &bytecode[0..4] != b"\x00\x61\x73\x6d" {
return Err(anyhow!("无效的WASM魔数"));
}
if &bytecode[4..8] != b"\x01\x00\x00\x00" {
return Err(anyhow!("不支持的WASM版本"));
}
Ok(())
}
pub fn execute_module(&self, name: &str) -> Result<Duration> {
let _start: _ = Instant::now();
let modules: _ = self.modules.lock().unwrap();
let module_info: _ = modules.iter().find(|m| m.name == name)
.ok_or_else(|| anyhow!("WASM模块 '{}' 未找到", name))?;
let module: _ = Module::new(&self.engine, &module_info.bytecode)
.with_context(|| format!("重新编译WASM模块 '{}' 失败", name))?;
let mut store = Store::new(&self.engine, ());
store.set_fuel(1_000_000)?;
let instance: _ = Instance::new(&mut store, &module, &[])
.with_context(|| format!("实例化WASM模块 '{}' 失败", name))?;
let mut execution_time = Duration::default();
if let Ok(start_func) = instance.get_typed_func::<(), ()>(&mut store, "_start") {
let func_start: _ = Instant::now();
start_func.call(&mut store, ())?;
execution_time = func_start.elapsed();
}
let mut stats = self.stats.lock().unwrap();
stats.total_executions += 1;
stats.total_execution_time += execution_time;
if stats.total_executions > 0 {
stats.avg_execution_time = Duration::from_nanos(
stats.total_execution_time.as_nanos() as u64 / stats.total_executions
);
}
drop(modules);
let mut modules = self.modules.lock().unwrap();
if let Some(module) = modules.iter_mut().find(|m| m.name == name) {
module.execution_count += 1;
}
Ok(execution_time)
}
pub fn get_stats(&self) -> WasmStats {
self.stats.lock().unwrap().clone()
}
pub fn list_modules(&self) -> Vec<String> {
let modules: _ = self.modules.lock().unwrap();
modules.iter().map(|m| m.name.clone()).collect()
}
pub fn clear_modules(&self) {
let mut modules = self.modules.lock().unwrap();
modules.clear();
println!("✅ 已清除所有WASM模块");
}
pub fn get_module_info(&self, name: &str) -> Option<WasmModule> {
let modules: _ = self.modules.lock().unwrap();
modules.iter().find(|m| m.name == name).cloned()
}
}
impl Default for WasmExecutor {
fn default() -> Self {
Self::new().expect("创建WasmExecutor失败")
}
}
pub fn initialize_wasm() -> Result<WasmExecutor> {
println!("🚀 初始化WebAssembly集成 (Wasmtime)...");
let executor: _ = WasmExecutor::new()?;
println!("📦 预加载示例WASM模块...");
let test_modules: _ = vec![
("test_simple", create_simple_wasm()),
("test_math", create_math_wasm()),
];
for (name, bytecode) in test_modules {
if let Err(e) = executor.load_module(name, bytecode) {
println!("⚠️ 预加载WASM模块 '{}' 失败: {}", name, e);
}
}
println!("✅ WebAssembly集成初始化完成 - Wasmtime模式");
Ok(executor)
}
pub fn check_wasm_support() -> bool {
true
}
fn create_simple_wasm() -> Vec<u8> {
wat::parse_str(r#"
(module
(func $_start (export "_start")
nop
)
)
"#).expect("解析WAT失败")
}
fn create_math_wasm() -> Vec<u8> {
wat::parse_str(r#"
(module
(func (export "add") (param i32 i32) (result i32)
local.get 0
local.get 1
i32.add
)
(func $_start (export "_start")
i32.const 5
i32.const 3
call 0
drop
)
)
"#).expect("解析WAT失败")
}