[易学易懂系列|rustlang语言|零基础|快速入门|（26）|实战3：Http服务器（多线程版本）]
项目实战
实战3：Http服务器
我们今天来进一步开发我们的Http服务器，用多线程实现。
我们在原来工程h_server更新代码如下：
src/main.rs:
use h_server::*;
use std::fs;
use std::io::prelude::*;
use std::net::TcpListener;
use std::net::TcpStream;
fn main() {
let listener = TcpListener::bind("127.0.0.1:7878").unwrap();
let pool = ThreadPool::new(4);
println!("multi-threads server is up!");
for stream in listener.incoming() {
let stream = stream.unwrap();
println!("multi-threads server get request!");
pool.execute(|| {
handle_connection(stream);
});
}
}
fn handle_connection(mut stream: TcpStream) {
let mut buffer = [0; 512];
stream.read(&mut buffer).unwrap();
let get = b"GET / HTTP/1.1\r\n";
let (status_line, filename) = if buffer.starts_with(get) {
("HTTP/1.1 200 OK\r\n\r\n", "hello.html")
} else {
("HTTP/1.1 404 NOT FOUND\r\n\r\n", "404.html")
};
let contents = fs::read_to_string(filename).unwrap();
let response = format!("{}{}", status_line, contents);
stream.write(response.as_bytes()).unwrap();
stream.flush().unwrap();
}
src/lib.rs:
use std::sync::mpsc;
use std::sync::Arc;
use std::sync::Mutex;
use std::thread;
enum Message {
NewJob(Job),
Terminate,
}
pub struct ThreadPool {
workers: Vec<Worker>,
sender: mpsc::Sender<Message>,
}
trait FnBox {
fn call_box(self: Box<Self>);
}
impl<F: FnOnce()> FnBox for F {
fn call_box(self: Box<F>) {
(*self)()
}
}
type Job = Box<dyn FnBox + Send + 'static>;
impl ThreadPool {
/// Create a new ThreadPool.
///
/// The size is the number of threads in the pool.
///
/// # Panics
///
/// The `new` function will panic if the size is zero.
pub fn new(size: usize) -> ThreadPool {
assert!(size > 0);
let (sender, receiver) = mpsc::channel();
let receiver = Arc::new(Mutex::new(receiver));
let mut workers = Vec::with_capacity(size);
for id in 0..size {
workers.push(Worker::new(id, Arc::clone(&receiver)));
}
ThreadPool { workers, sender }
}
pub fn execute<F>(&self, f: F)
where
//这里定义闭包，是FnOnce类型，代表一个线程只运行一次
//Send类型，代表闭包可以在不同线程中传递
//'static，代表闭包生命周期跟整个程序一样
F: FnOnce() + Send + 'static,
{
let job = Box::new(f);
self.sender.send(Message::NewJob(job)).unwrap();
}
}
//实现Drop特征，用于处理资源释放相关逻辑
impl Drop for ThreadPool {
fn drop(&mut self) {
println!("Sending terminate message to all workers.");
for _ in &mut self.workers {
self.sender.send(Message::Terminate).unwrap();
}
println!("Shutting down all workers.");
for worker in &mut self.workers {
println!("Shutting down worker {}", worker.id);
if let Some(thread) = worker.thread.take() {
thread.join().unwrap();
}
}
}
}
struct Worker {
id: usize,
thread: Option<thread::JoinHandle<()>>,
}
impl Worker {
fn new(id: usize, receiver: Arc<Mutex<mpsc::Receiver<Message>>>) -> Worker {
let thread = thread::spawn(move || loop {
let message = receiver.lock().unwrap().recv().unwrap();
match message {
Message::NewJob(job) => {
println!("Worker {} got a job; executing.", id);
job.call_box();
}
Message::Terminate => {
println!("Worker {} was told to terminate.", id);
break;
}
}
});
Worker {
id,
thread: Some(thread),
}
}
}
直接运行命令：
cargo run
启动服务器。
然后用浏览器访问：
页面显示：
Hello!
Hi from Rust
以上，希望对你有用。
如果遇到什么问题，欢迎加入：rust新手群，在这里我可以提供一些简单的帮助，加微信：360369487，注明：博客园+rust
参考文章：