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//! Hello world server.
//!
//! A simple server that accepts connections, writes "hello world\n", and closes
//! the connection.
//!
//! You can test this out by running:
//!
//! cargo run --example hello_world
//!
//! And then in another terminal run:
//!
//! telnet localhost 6142
//!
#![deny(warnings)]
extern crate tokio;
use tokio::io;
use tokio::net::TcpListener;
use tokio::prelude::*;
pub fn main() {
let addr = "127.0.0.1:6142".parse().unwrap();
// Bind a TCP listener to the socket address.
//
// Note that this is the Tokio TcpListener, which is fully async.
let listener = TcpListener::bind(&addr).unwrap();
// The server task asynchronously iterates over and processes each
// incoming connection.
let server = listener.incoming().for_each(|socket| {
println!("accepted socket; addr={:?}", socket.peer_addr().unwrap());
let connection = io::write_all(socket, "hello world\n")
.then(|res| {
println!("wrote message; success={:?}", res.is_ok());
Ok(())
});
// Spawn a new task that processes the socket:
tokio::spawn(connection);
Ok(())
})
.map_err(|err| {
// All tasks must have an `Error` type of `()`. This forces error
// handling and helps avoid silencing failures.
//
// In our example, we are only going to log the error to STDOUT.
println!("accept error = {:?}", err);
});
println!("server running on localhost:6142");
// This starts the `current_thread` executor.
//
// Executors are responsible for scheduling many asynchronous tasks, driving
// them to completion. There are a number of different executor
// implementations, each providing different scheduling characteristics.
//
// The `current_thread` executor multiplexes all scheduled tasks on the
// current thread. This means that spawned tasks must not implement `Send`.
// It's important to note that all futures / tasks are lazy. No work will
// happen unless they are spawned onto an executor.
//
// The executor will start running the `server` task, which, in turn, spawns
// new tasks for each incoming connection.
//
// The `current_thread::block_on_all` function will block until *all*
// spawned tasks complete.
//
// In our example, we have not defined a shutdown strategy, so this will
// block until `ctrl-c` is pressed at the terminal.
tokio::run(server);
}
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