Let's rename everything!

src/bin/echo.rs

@@ -0,0 +1,53 @@
+//! 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_io::{copy, TaskIo};
+use futures::stream::Stream;
+
+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!("Listenering on: {}", addr);
+
+        // Pull out the stream of incoming connections and then for each new
+        // one spin up a new task copying data. We put the `socket` into a
+        // `TaskIo` structure which then allows us to `split` it into the read
+        // and write halves of the socket.
+        //
+        // Finally 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 io = TaskIo::new(socket);
+            let pair = io.map(|io| io.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();
+}