Change the Handler trait to receive an Iterator of (Request, Response) pairs.

examples/server.rs

@@ -1,38 +1,55 @@
+#![feature(macro_rules)]
+
 extern crate hyper;
 extern crate debug;
 
-use std::io::{IoResult};
 use std::io::util::copy;
 use std::io::net::ip::Ipv4Addr;
 
 use hyper::{Get, Post};
-use hyper::server::{Server, Handler, Request, Response};
+use hyper::server::{Server, Handler, Incoming};
 use hyper::header::ContentLength;
 
 struct Echo;
 
+macro_rules! try_continue(
+    ($e:expr) => {{
+        match $e {
+            Ok(v) => v,
+            Err(e) => { println!("Error: {}", e); continue; }
+        }
+    }}
+)
+
 impl Handler for Echo {
-    fn handle(&mut self, mut req: Request, mut res: Response) -> IoResult<()> {
-        match req.uri {
-            hyper::uri::AbsolutePath(ref path) => match (&req.method, path.as_slice()) {
-                (&Get, "/") | (&Get, "/echo") => {
-                    let out = b"Try POST /echo";
-
-                    res.headers.set(ContentLength(out.len()));
-                    try!(res.write(out));
-                    return res.end();
+    fn handle(self, mut incoming: Incoming) {
+        for (mut req, mut res) in incoming {
+            match req.uri {
+                hyper::uri::AbsolutePath(ref path) => match (&req.method, path.as_slice()) {
+                    (&Get, "/") | (&Get, "/echo") => {
+                        let out = b"Try POST /echo";
+
+                        res.headers.set(ContentLength(out.len()));
+                        try_continue!(res.write(out));
+                        try_continue!(res.end());
+                        continue;
+                    },
+                    (&Post, "/echo") => (), // fall through, fighting mutable borrows
+                    _ => {
+                        res.status = hyper::status::NotFound;
+                        try_continue!(res.end());
+                        continue;
+                    }
                 },
-                (&Post, "/echo") => (), // fall through, fighting mutable borrows
                 _ => {
-                    res.status = hyper::status::NotFound;
-                    return res.end();
+                    try_continue!(res.end());
+                    continue; 
                 }
-            },
-            _ => return res.end()
-        };
+            };
 
-        try!(copy(&mut req, &mut res));
-        res.end()
+            try_continue!(copy(&mut req, &mut res));
+            try_continue!(res.end());
+        }
     }
 }
 

src/server/mod.rs

@@ -1,6 +1,6 @@
 //! HTTP Server
 use std::io::net::tcp::{TcpListener, TcpAcceptor};
-use std::io::{Acceptor, Listener, IoResult, EndOfFile};
+use std::io::{Acceptor, Listener, IoResult, EndOfFile, IncomingConnections};
 use std::io::net::ip::{IpAddr, Port, SocketAddr};
 
 pub use self::request::Request;
@@ -30,42 +30,15 @@ impl Server {
     }
 
     /// Binds to a socket, and starts handling connections.
-    pub fn listen<H: Handler + 'static>(self, mut handler: H) -> IoResult<Listening> {
+    pub fn listen<H: Handler + 'static>(self, handler: H) -> IoResult<Listening> {
         let mut listener = try!(TcpListener::bind(self.ip.to_string().as_slice(), self.port));
         let socket = try!(listener.socket_name());
         let acceptor = try!(listener.listen());
         let worker = acceptor.clone();
 
         spawn(proc() {
             let mut acceptor = worker;
-            for conn in acceptor.incoming() {
-                match conn {
-                    Ok(stream) => {
-                        debug!("Incoming stream");
-                        let clone = stream.clone();
-                        let req = match Request::new(stream) {
-                            Ok(r) => r,
-                            Err(err) => {
-                                error!("creating Request: {}", err);
-                                continue;
-                            }
-                        };
-                        let mut res = Response::new(clone);
-                        res.version = req.version;
-                        match handler.handle(req, res) {
-                            Ok(..) => debug!("Stream handled"),
-                            Err(e) => {
-                                error!("Error from handler: {}", e)
-                                //TODO try to send a status code
-                            }
-                        }
-                    },
-                    Err(ref e) if e.kind == EndOfFile => break, // server closed
-                    Err(e) => {
-                        error!("Connection failed: {}", e);
-                    }
-                }
-            }
+            handler.handle(Incoming { from: acceptor.incoming() });
         });
 
         Ok(Listening {
@@ -76,6 +49,41 @@ impl Server {
 
 }
 
+/// An iterator over incoming connections, represented as pairs of
+/// hyper Requests and Responses.
+pub struct Incoming<'a> {
+    from: IncomingConnections<'a, TcpAcceptor>
+}
+
+impl<'a> Iterator<(Request, Response)> for Incoming<'a> {
+    fn next(&mut self) -> Option<(Request, Response)> {
+        for conn in self.from {
+            match conn {
+                Ok(stream) => {
+                    debug!("Incoming stream");
+                    let clone = stream.clone();
+                    let req = match Request::new(stream) {
+                        Ok(r) => r,
+                        Err(err) => {
+                            error!("creating Request: {}", err);
+                            continue;
+                        }
+                    };
+                    let mut res = Response::new(clone);
+                    res.version = req.version;
+                    return Some((req, res))
+                },
+                Err(ref e) if e.kind == EndOfFile => return None, // server closed
+                Err(e) => {
+                    error!("Connection failed: {}", e);
+                    continue;
+                }
+            }
+        }
+        None
+    }
+}
+
 /// A listening server, which can later be closed.
 pub struct Listening {
     acceptor: TcpAcceptor,
@@ -96,11 +104,12 @@ pub trait Handler: Send {
     /// Receives a `Request`/`Response` pair, and should perform some action on them.
     ///
     /// This could reading from the request, and writing to the response.
-    fn handle(&mut self, req: Request, res: Response) -> IoResult<()>;
+    fn handle(self, Incoming);
 }
 
-impl Handler for fn(Request, Response) -> IoResult<()> {
-    fn handle(&mut self, req: Request, res: Response) -> IoResult<()> {
-        (*self)(req, res)
+impl Handler for fn(Incoming) {
+    fn handle(self, incoming: Incoming) {
+        (self)(incoming)
     }
 }
+