我正在尝试在 Tokio 中构建一个回显服务器。我见过一些例子,但它们似乎都使用io::copy
了 Tokio IO,我不能使用,因为我想修改输出。
但是,我无法编译同时使用writer
和的服务器reader
。我想构建一个基于期货的任务,该任务可以循环读取/写入(回显服务器)。
我的实际代码是这样的:
extern crate futures;
extern crate futures_cpupool;
extern crate tokio;
extern crate tokio_io;
use futures::prelude::*;
use futures_cpupool::CpuPool;
use tokio_io::AsyncRead;
use futures::Stream;
use futures::stream;
use tokio_io::codec::*;
use std::rc::Rc;
fn main() {
let pool = CpuPool::new_num_cpus();
use std::net::*;
let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
let listener = tokio::net::TcpListener::bind(&socket).unwrap();
let server = listener.incoming().for_each(|socket| {
let (writer, reader) = socket.framed(LinesCodec::new()).split();
let writer = Rc::new(writer);
let action = reader.for_each(|line| {
println!("ECHO: {}", line);
writer.send(line);
Ok(())
});
pool.spawn(action); // std::rc::Rc<futures::stream::SplitSink<tokio_io::codec::Framed<tokio::net::TcpStream, tokio_io::codec::LinesCodec>>>` cannot be shared between threads safely
Ok(())
});
server.wait().unwrap();
}
您可能会说我必须使用Arc
,因为涉及不同的线程。我已经尝试过Arc
and Mutex
,但是出现了另一个错误,我想不出办法让它编译:
extern crate futures;
extern crate futures_cpupool;
extern crate tokio;
extern crate tokio_io;
use futures::prelude::*;
use std::time;
use std::thread;
use futures_cpupool::CpuPool;
use tokio_io::AsyncRead;
use futures::Stream;
use tokio_io::codec::*;
use std::sync::Arc;
use std::sync::Mutex;
fn main() {
let pool = CpuPool::new_num_cpus();
use std::net::*;
let socket = SocketAddr::new(IpAddr::V4(Ipv4Addr::new(127, 0, 0, 1)), 8080);
let listener = tokio::net::TcpListener::bind(&socket).unwrap();
let server = listener.incoming().for_each(|socket| {
let (writer, reader) = socket.framed(LinesCodec::new()).split();
let writer = Arc::new(Mutex::new(writer));
let action = reader.for_each(move |line| {
println!("ECHO: {}", line);
writer.lock().unwrap().send(line); // cannot move out of borrowed content
Ok(())
});
pool.spawn(action);
Ok(())
});
server.wait().unwrap();
}
它说的错误是:cannot move out of borrowed content