Wire in trailers (#34)

Add send and receive trailer support.

examples/server-tr.rs

@@ -0,0 +1,83 @@
+extern crate h2;
+extern crate http;
+extern crate bytes;
+extern crate futures;
+extern crate tokio_io;
+extern crate tokio_core;
+extern crate io_dump;
+extern crate env_logger;
+
+use h2::server::Server;
+
+use http::*;
+use bytes::*;
+use futures::*;
+
+use tokio_core::reactor;
+use tokio_core::net::TcpListener;
+
+pub fn main() {
+    let _ = env_logger::init();
+
+    let mut core = reactor::Core::new().unwrap();;
+    let handle = core.handle();
+
+    let listener = TcpListener::bind(
+        &"127.0.0.1:5928".parse().unwrap(),
+        &handle).unwrap();
+
+    println!("listening on {:?}", listener.local_addr());
+
+    let server = listener.incoming().for_each(move |(socket, _)| {
+        // let socket = io_dump::Dump::to_stdout(socket);
+
+
+        let connection = Server::handshake(socket)
+            .and_then(|conn| {
+                println!("H2 connection bound");
+
+                conn.for_each(|(request, mut stream)| {
+                    println!("GOT request: {:?}", request);
+
+                    let response = Response::builder()
+                        .status(status::OK)
+                        .body(()).unwrap();
+
+                    if let Err(e) = stream.send_response(response, false) {
+                        println!(" error responding; err={:?}", e);
+                    }
+
+                    println!(">>>> sending data");
+                    if let Err(e) = stream.send_data(Bytes::from_static(b"hello world"), false) {
+                        println!("  -> err={:?}", e);
+                    }
+
+                    let mut hdrs = HeaderMap::new();
+                    hdrs.insert("status", "ok".parse().unwrap());
+
+                    println!(">>>> sending trailers");
+                    if let Err(e) = stream.send_trailers(hdrs) {
+                        println!("  -> err={:?}", e);
+                    }
+
+                    Ok(())
+                }).and_then(|_| {
+                    println!("~~~~~~~~~~~~~~~~~~~~~~~~~~~ H2 connection CLOSE !!!!!! ~~~~~~~~~~~");
+                    Ok(())
+                })
+            })
+            .then(|res| {
+                if let Err(e) = res {
+                    println!("  -> err={:?}", e);
+                }
+
+                Ok(())
+            })
+            ;
+
+        handle.spawn(connection);
+        Ok(())
+    });
+
+    core.run(server).unwrap();
+}