Add GoAway support

src/frame/go_away.rs

@@ -1,4 +1,7 @@
-use frame::{Error, StreamId};
+use error::Reason;
+use frame::{self, Head, Error, Kind, StreamId};
+
+use bytes::{BufMut, BigEndian};
 
 #[derive(Debug)]
 pub struct GoAway {
@@ -7,6 +10,10 @@ pub struct GoAway {
 }
 
 impl GoAway {
+    pub fn reason(&self) -> Reason {
+        self.error_code.into()
+    }
+
     pub fn load(payload: &[u8]) -> Result<GoAway, Error> {
         if payload.len() < 8 {
             // Invalid payload len
@@ -22,4 +29,18 @@ impl GoAway {
             error_code: error_code,
         })
     }
+
+    pub fn encode<B: BufMut>(&self, dst: &mut B) {
+        trace!("encoding GO_AWAY; code={}", self.error_code);
+        let head = Head::new(Kind::GoAway, 0, StreamId::zero());
+        head.encode(8, dst);
+        dst.put_u32::<BigEndian>(self.last_stream_id.into());
+        dst.put_u32::<BigEndian>(self.error_code);
+    }
+}
+
+impl<B> From<GoAway> for frame::Frame<B> {
+    fn from(src: GoAway) -> Self {
+        frame::Frame::GoAway(src)
+    }
 }

src/frame/mod.rs

@@ -62,6 +62,7 @@ pub enum Frame<T = Bytes> {
     PushPromise(PushPromise),
     Settings(Settings),
     Ping(Ping),
+    GoAway(GoAway),
     WindowUpdate(WindowUpdate),
     Reset(Reset)
 }
@@ -100,6 +101,7 @@ impl<T> fmt::Debug for Frame<T> {
             PushPromise(ref frame) => write!(fmt, "Frame::PushPromise({:?})", frame),
             Settings(ref frame) => write!(fmt, "Frame::Settings({:?})", frame),
             Ping(ref frame) => write!(fmt, "Frame::Ping({:?})", frame),
+            GoAway(ref frame) => write!(fmt, "Frame::GoAway({:?})", frame),
             WindowUpdate(ref frame) => write!(fmt, "Frame::WindowUpdate({:?})", frame),
             Reset(ref frame) => write!(fmt, "Frame::Reset({:?})", frame),
         }

src/frame/window_update.rs

@@ -48,7 +48,7 @@ impl WindowUpdate {
 
     pub fn encode<B: BufMut>(&self, dst: &mut B) {
         trace!("encoding WINDOW_UPDATE; id={:?}", self.stream_id);
-        let head = Head::new(Kind::Ping, 0, self.stream_id);
+        let head = Head::new(Kind::WindowUpdate, 0, self.stream_id);
         head.encode(4, dst);
         dst.put_u32::<BigEndian>(self.size_increment);
     }

src/proto/connection.rs

@@ -128,6 +128,12 @@ impl<T, P, B> Connection<T, P, B>
 
                     // TODO: ACK must be sent THEN settings applied.
                 }
+                Some(GoAway(frame)) => {
+                    // TODO: handle the last_stream_id. Also, should this be
+                    // handled as an error?
+                    let e = ConnectionError::Proto(frame.reason());
+                    return Ok(().into());
+                }
                 Some(Ping(frame)) => {
                     trace!("recv PING; frame={:?}", frame);
                     self.ping_pong.recv_ping(frame);

src/proto/framed_read.rs

@@ -64,7 +64,6 @@ impl<T> FramedRead<T> {
                 let _ = bytes.split_to(frame::HEADER_LEN);
                 frame::Data::load(head, bytes)?.into()
             }
-
             Kind::Headers => {
                 let mut buf = Cursor::new(bytes);
                 buf.set_position(frame::HEADER_LEN as u64);
@@ -80,16 +79,11 @@ impl<T> FramedRead<T> {
 
                 frame.into()
             }
-
             Kind::Reset => {
                 frame::Reset::load(head, &bytes[frame::HEADER_LEN..])?.into()
             }
-
-            // TODO
-
             Kind::GoAway => {
-                let _todo = try!(frame::GoAway::load(&bytes[frame::HEADER_LEN..]));
-                unimplemented!();
+                frame::GoAway::load(&bytes[frame::HEADER_LEN..])?.into()
             }
             Kind::PushPromise => {
                 frame::PushPromise::load(head, &bytes[frame::HEADER_LEN..])?.into()

src/proto/framed_write.rs

@@ -141,6 +141,10 @@ impl<T, B> Sink for FramedWrite<T, B>
                 v.encode(self.buf.get_mut());
                 trace!("encoded settings; rem={:?}", self.buf.remaining());
             }
+            Frame::GoAway(v) => {
+                v.encode(self.buf.get_mut());
+                trace!("encoded go_away; rem={:?}", self.buf.remaining());
+            }
             Frame::Ping(v) => {
                 v.encode(self.buf.get_mut());
                 trace!("encoded ping; rem={:?}", self.buf.remaining());