mirror of
https://github.com/tokio-rs/tokio.git
synced 2025-11-03 14:02:47 +00:00
108e1a2c1a
This commit uses a script to rename `Core` to `Reactor` all at once, notably:
find . -name '*.rs' | xargs sed -i 's/\bCore\b/Reactor/g'
106 lines
3.7 KiB
Rust
106 lines
3.7 KiB
Rust
//! A multithreaded version of an echo server
|
|
//!
|
|
//! This server implements the same functionality as the `echo` example, except
|
|
//! that this example will use all cores of the machine to do I/O instead of
|
|
//! just one. This examples works by having the main thread using blocking I/O
|
|
//! and shipping accepted sockets to worker threads in a round-robin fashion.
|
|
//!
|
|
//! To see this server in action, you can run this in one terminal:
|
|
//!
|
|
//! cargo run --example echo-threads
|
|
//!
|
|
//! and in another terminal you can run:
|
|
//!
|
|
//! cargo run --example connect 127.0.0.1:8080
|
|
|
|
extern crate futures;
|
|
extern crate futures_cpupool;
|
|
extern crate num_cpus;
|
|
extern crate tokio;
|
|
extern crate tokio_io;
|
|
|
|
use std::env;
|
|
use std::net::{self, SocketAddr};
|
|
use std::thread;
|
|
|
|
use futures::Future;
|
|
use futures::future::Executor;
|
|
use futures::stream::Stream;
|
|
use futures::sync::mpsc;
|
|
use futures_cpupool::CpuPool;
|
|
use tokio_io::AsyncRead;
|
|
use tokio_io::io::copy;
|
|
use tokio::net::TcpStream;
|
|
use tokio::reactor::Reactor;
|
|
|
|
fn main() {
|
|
// First argument, the address to bind
|
|
let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
|
|
let addr = addr.parse::<SocketAddr>().unwrap();
|
|
|
|
// Second argument, the number of threads we'll be using
|
|
let num_threads = env::args().nth(2).and_then(|s| s.parse().ok())
|
|
.unwrap_or(num_cpus::get());
|
|
|
|
// Use `std::net` to bind the requested port, we'll use this on the main
|
|
// thread below
|
|
let listener = net::TcpListener::bind(&addr).expect("failed to bind");
|
|
println!("Listening on: {}", addr);
|
|
|
|
// Spin up our worker threads, creating a channel routing to each worker
|
|
// thread that we'll use below.
|
|
let mut channels = Vec::new();
|
|
for _ in 0..num_threads {
|
|
let (tx, rx) = mpsc::unbounded();
|
|
channels.push(tx);
|
|
thread::spawn(|| worker(rx));
|
|
}
|
|
|
|
// Infinitely accept sockets from our `std::net::TcpListener`, as this'll do
|
|
// blocking I/O. Each socket is then shipped round-robin to a particular
|
|
// thread which will associate the socket with the corresponding event loop
|
|
// and process the connection.
|
|
let mut next = 0;
|
|
for socket in listener.incoming() {
|
|
let socket = socket.expect("failed to accept");
|
|
channels[next].unbounded_send(socket).expect("worker thread died");
|
|
next = (next + 1) % channels.len();
|
|
}
|
|
}
|
|
|
|
fn worker(rx: mpsc::UnboundedReceiver<net::TcpStream>) {
|
|
let mut core = Reactor::new().unwrap();
|
|
let handle = core.handle();
|
|
|
|
let pool = CpuPool::new(1);
|
|
|
|
let done = rx.for_each(move |socket| {
|
|
// First up when we receive a socket we associate it with our event loop
|
|
// using the `TcpStream::from_stream` API. After that the socket is not
|
|
// a `tokio::net::TcpStream` meaning it's in nonblocking mode and
|
|
// ready to be used with Tokio
|
|
let socket = TcpStream::from_std(socket, &handle)
|
|
.expect("failed to associate TCP stream");
|
|
let addr = socket.peer_addr().expect("failed to get remote address");
|
|
|
|
// Like the single-threaded `echo` example we split the socket halves
|
|
// and use the `copy` helper to ship bytes back and forth. Afterwards we
|
|
// spawn the task to run concurrently on this thread, and then print out
|
|
// what happened afterwards
|
|
let (reader, writer) = socket.split();
|
|
let amt = copy(reader, writer);
|
|
let msg = amt.then(move |result| {
|
|
match result {
|
|
Ok((amt, _, _)) => println!("wrote {} bytes to {}", amt, addr),
|
|
Err(e) => println!("error on {}: {}", addr, e),
|
|
}
|
|
|
|
Ok(())
|
|
});
|
|
pool.execute(msg).unwrap();
|
|
|
|
Ok(())
|
|
});
|
|
core.run(done).unwrap();
|
|
}
|