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//! An echo server that just writes back everything that's written to it.
extern crate futures;
extern crate futures_io;
extern crate futures_mio;
use std::env;
use std::net::SocketAddr;
use futures::Future;
use futures::stream::Stream;
use futures_io::{copy, TaskIo};
fn main() {
let addr = env::args().nth(1).unwrap_or("127.0.0.1:8080".to_string());
let addr = addr.parse::<SocketAddr>().unwrap();
// Create the event loop that will drive this server
let mut l = futures_mio::Loop::new().unwrap();
// Create a TCP listener which will listen for incoming connections
let server = l.handle().tcp_listen(&addr);
let done = server.and_then(move |socket| {
// Once we've got the TCP listener, inform that we have it
println!("Listening on: {}", addr);
// Pull out the stream of incoming connections and then for each new
// one spin up a new task copying data.
//
// We use the `io::copy` future to copy all data from the
// reading half onto the writing half.
socket.incoming().for_each(|(socket, addr)| {
let socket = futures::lazy(|| futures::finished(TaskIo::new(socket)));
let pair = socket.map(|s| s.split());
let amt = pair.and_then(|(reader, writer)| copy(reader, writer));
// Once all that is done we print out how much we wrote, and then
// critically we *forget* this future which allows it to run
// concurrently with other connections.
amt.map(move |amt| {
println!("wrote {} bytes to {}", amt, addr)
}).forget();
Ok(())
})
});
l.run(done).unwrap();
}
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