用Rust编写的TCP服务器示例

Question

我正在寻找Rust中TCP服务器的一个例子.

"hello world"或者echo服务器都会很棒.

Answer 1

这是一个非常简单的例子std::net.它是针对当前的Rust大师开发的,并且应该在1.*上工作.

小心这个例子; 它被简化了; 如果绑定,倾听或接受产生错误,您可能不希望它发生恐慌.

use std::io::Write;
use std::net::TcpListener;
use std::thread;

fn main() {
    let listener = TcpListener::bind("127.0.0.1:9123").unwrap();
    println!("listening started, ready to accept");
    for stream in listener.incoming() {
        thread::spawn(|| {
            let mut stream = stream.unwrap();
            stream.write(b"Hello World\r\n").unwrap();
        });
    }
}

注意关于接受的范例; 你必须accept()自己发起请求(在这个例子中我们使用的incoming()是accept()每次调用的迭代器),这样你就可以真正控制它们的任务.

因此,我将实际的流处理代码放入一个单独的线程中,但它不需要非常短的请求(它只是意味着在处理第一个请求时你将无法处理第二个请求); 你也可以删除thread::spawn(|| { ... })那两行.额外线程的使用也提供了一定程度的隔离; 如果线程展开,整个服务器都不会死(但请记住,内存不足或者在展开时让析构函数发生混乱会导致整个服务器死掉).

Answer 2

简单的TCP回显服务器https://gist.github.com/seriyps/fd6d29442e16c44ba400

#![feature(phase)]
#[phase(plugin, link)] extern crate log;
extern crate green;
extern crate rustuv;

use std::io;
use std::os;
use std::io::{Listener,Acceptor,TcpStream};

// This is for green threads. If removed, will spawn 1 OS thread per client.
#[start]
fn start(argc: int, argv: *const *const u8) -> int {
    green::start(argc, argv, rustuv::event_loop, main)
}


fn main() {
    let host = "127.0.0.1";
    let port = 8080;

    let sock = io::TcpListener::bind(host, port).unwrap();
    let mut acceptor = sock.listen();
    for stream in acceptor.incoming() {
        match stream {
            Err(e) => warn!("Accept err {}", e),
            Ok(stream) => {
                spawn(proc() {
                    debug!("{}", handle_client(stream));
                })
            }
        }
    }
}

fn handle_client(mut stream: io::TcpStream) -> io::IoResult<()> {
    info!("New client {}", stream.peer_name());
    let mut buf = [0u8, ..4096];
    loop {
        let got = try!(stream.read(buf));
        if got == 0 {
            // Is it possible? Or IoError will be raised anyway?
            break
        }
        try!(stream.write(buf.slice(0, got)));
    }
    Ok(())
}