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https://github.com/tokio-rs/tokio.git
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c6f1ff13d2
In accordance with tokio-rs/tokio-rfcs#3, the executor functionality of Tokio is being removed and will be relocated into futures-rs as a "current thread" executor. This PR removes task execution from the code base. As a temporary mesure, all examples and tests are switched to using CpuPool. Depends on #19.
106 lines
3.7 KiB
Rust
106 lines
3.7 KiB
Rust
//! A multithreaded version of an echo server
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//!
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//! This server implements the same functionality as the `echo` example, except
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//! that this example will use all cores of the machine to do I/O instead of
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//! just one. This examples works by having the main thread using blocking I/O
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//! and shipping accepted sockets to worker threads in a round-robin fashion.
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//!
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//! To see this server in action, you can run this in one terminal:
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//!
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//! cargo run --example echo-threads
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//!
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//! and in another terminal you can run:
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//!
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//! cargo run --example connect 127.0.0.1:8080
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extern crate futures;
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extern crate futures_cpupool;
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extern crate num_cpus;
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extern crate tokio;
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extern crate tokio_io;
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use std::env;
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use std::net::{self, SocketAddr};
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use std::thread;
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use futures::Future;
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use futures::future::Executor;
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use futures::stream::Stream;
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use futures::sync::mpsc;
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use futures_cpupool::CpuPool;
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use tokio_io::AsyncRead;
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use tokio_io::io::copy;
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use tokio::net::TcpStream;
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use tokio::reactor::Core;
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fn main() {
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// First argument, the address to bind
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let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
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let addr = addr.parse::<SocketAddr>().unwrap();
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// Second argument, the number of threads we'll be using
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let num_threads = env::args().nth(2).and_then(|s| s.parse().ok())
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.unwrap_or(num_cpus::get());
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// Use `std::net` to bind the requested port, we'll use this on the main
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// thread below
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let listener = net::TcpListener::bind(&addr).expect("failed to bind");
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println!("Listening on: {}", addr);
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// Spin up our worker threads, creating a channel routing to each worker
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// thread that we'll use below.
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let mut channels = Vec::new();
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for _ in 0..num_threads {
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let (tx, rx) = mpsc::unbounded();
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channels.push(tx);
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thread::spawn(|| worker(rx));
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}
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// Infinitely accept sockets from our `std::net::TcpListener`, as this'll do
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// blocking I/O. Each socket is then shipped round-robin to a particular
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// thread which will associate the socket with the corresponding event loop
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// and process the connection.
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let mut next = 0;
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for socket in listener.incoming() {
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let socket = socket.expect("failed to accept");
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channels[next].unbounded_send(socket).expect("worker thread died");
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next = (next + 1) % channels.len();
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}
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}
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fn worker(rx: mpsc::UnboundedReceiver<net::TcpStream>) {
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let mut core = Core::new().unwrap();
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let handle = core.handle();
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let pool = CpuPool::new(1);
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let done = rx.for_each(move |socket| {
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// First up when we receive a socket we associate it with our event loop
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// using the `TcpStream::from_stream` API. After that the socket is not
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// a `tokio::net::TcpStream` meaning it's in nonblocking mode and
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// ready to be used with Tokio
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let socket = TcpStream::from_stream(socket, &handle)
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.expect("failed to associate TCP stream");
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let addr = socket.peer_addr().expect("failed to get remote address");
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// Like the single-threaded `echo` example we split the socket halves
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// and use the `copy` helper to ship bytes back and forth. Afterwards we
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// spawn the task to run concurrently on this thread, and then print out
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// what happened afterwards
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let (reader, writer) = socket.split();
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let amt = copy(reader, writer);
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let msg = amt.then(move |result| {
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match result {
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Ok((amt, _, _)) => println!("wrote {} bytes to {}", amt, addr),
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Err(e) => println!("error on {}: {}", addr, e),
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}
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Ok(())
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});
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pool.execute(msg).unwrap();
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Ok(())
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});
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core.run(done).unwrap();
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}
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