| //! 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: |
| //! |
| //! cargo run --example connect 127.0.0.1:8080 > /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; |
| extern crate tokio_io; |
| |
| use std::env; |
| use std::iter; |
| use std::net::SocketAddr; |
| |
| use futures::Future; |
| use futures::stream::{self, Stream}; |
| use tokio_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 core = Core::new().unwrap(); |
| let handle = core.handle(); |
| let socket = TcpListener::bind(&addr, &handle).unwrap(); |
| println!("Listening on: {}", addr); |
| let server = socket.incoming().for_each(|(socket, addr)| { |
| println!("got a socket: {}", addr); |
| handle.spawn(write(socket).or_else(|_| Ok(()))); |
| Ok(()) |
| }); |
| core.run(server).unwrap(); |
| } |
| |
| fn write(socket: TcpStream) -> IoFuture<()> { |
| static BUF: &'static [u8] = &[0; 64 * 1024]; |
| let iter = iter::repeat(()); |
| Box::new(stream::iter_ok(iter).fold(socket, |socket, ()| { |
| tokio_io::io::write_all(socket, BUF).map(|(socket, _)| socket) |
| }).map(|_| ())) |
| } |