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//! A small server that writes as many nul bytes on all connections it receives.
//!
//! There is no concurrency in this server, only one connection is written to at
//! a time. You can use this as a benchmark for the raw performance of writing
//! data to a socket by measuring how much data is being written on each
//! connection.
//!
//! Typically you'll want to run this example with:
//!
//! cargo run --example sink --release
//!
//! And then you can connect to it via:
//!
//! nc -4 localhost 8080 > /dev/null
//!
//! You should see your CPUs light up as data's being shove into the ether.
extern crate env_logger;
extern crate futures;
extern crate tokio_core;
use std::env;
use std::iter;
use std::net::SocketAddr;
use futures::Future;
use futures::stream::{self, Stream};
use tokio_core::io::IoFuture;
use tokio_core::net::{TcpListener, TcpStream};
use tokio_core::reactor::Core;
fn main() {
env_logger::init().unwrap();
let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
let addr = addr.parse::<SocketAddr>().unwrap();
let mut l = Core::new().unwrap();
let socket = TcpListener::bind(&addr, &l.handle()).unwrap();
println!("Listening on: {}", addr);
let server = socket.incoming().and_then(|(socket, addr)| {
println!("got a socket: {}", addr);
write(socket).or_else(|_| Ok(()))
}).for_each(|()| {
println!("lost the socket");
Ok(())
});
l.run(server).unwrap();
}
fn write(socket: TcpStream) -> IoFuture<()> {
static BUF: &'static [u8] = &[0; 64 * 1024];
let iter = iter::repeat(()).map(|()| Ok(()));
stream::iter(iter).fold(socket, |socket, ()| {
tokio_core::io::write_all(socket, BUF).map(|(socket, _)| socket)
}).map(|_| ()).boxed()
}
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