add Client config to disable server push

- Adds `Client::builder().enable_push(false)` to disable push
- Client sends a GO_AWAY if receiving a push when it's disabled

src/proto/streams/counts.rs

@@ -34,9 +34,9 @@ where
     /// Create a new `Counts` using the provided configuration values.
     pub fn new(config: &Config) -> Self {
         Counts {
-            max_send_streams: config.max_local_initiated,
+            max_send_streams: config.local_max_initiated,
             num_send_streams: 0,
-            max_recv_streams: config.max_remote_initiated,
+            max_recv_streams: config.remote_max_initiated,
             num_recv_streams: 0,
             blocked_open: None,
             _p: PhantomData,

src/proto/streams/mod.rs

@@ -31,15 +31,18 @@ use http::{Request, Response};
 
 #[derive(Debug)]
 pub struct Config {
-    /// Maximum number of remote initiated streams
-    pub max_remote_initiated: Option<usize>,
-
-    /// Initial window size of remote initiated streams
-    pub init_remote_window_sz: WindowSize,
+    /// Initial window size of locally initiated streams
+    pub local_init_window_sz: WindowSize,
 
     /// Maximum number of locally initiated streams
-    pub max_local_initiated: Option<usize>,
+    pub local_max_initiated: Option<usize>,
 
-    /// Initial window size of locally initiated streams
-    pub init_local_window_sz: WindowSize,
+    /// If the local peer is willing to receive push promises
+    pub local_push_enabled: bool,
+
+    /// Initial window size of remote initiated streams
+    pub remote_init_window_sz: WindowSize,
+
+    /// Maximum number of remote initiated streams
+    pub remote_max_initiated: Option<usize>,
 }

src/proto/streams/prioritize.rs

@@ -49,11 +49,11 @@ where
     pub fn new(config: &Config) -> Prioritize<B, P> {
         let mut flow = FlowControl::new();
 
-        flow.inc_window(config.init_local_window_sz)
+        flow.inc_window(config.local_init_window_sz)
             .ok()
             .expect("invalid initial window size");
 
-        flow.assign_capacity(config.init_local_window_sz);
+        flow.assign_capacity(config.local_init_window_sz);
 
         trace!("Prioritize::new; flow={:?}", flow);
 

src/proto/streams/recv.rs

@@ -38,6 +38,9 @@ where
     /// Refused StreamId, this represents a frame that must be sent out.
     refused: Option<StreamId>,
 
+    /// If push promises are allowed to be recevied.
+    is_push_enabled: bool,
+
     _p: PhantomData<B>,
 }
 
@@ -71,7 +74,7 @@ where
         flow.assign_capacity(DEFAULT_INITIAL_WINDOW_SIZE);
 
         Recv {
-            init_window_sz: config.init_local_window_sz,
+            init_window_sz: config.local_init_window_sz,
             flow: flow,
             next_stream_id: next_stream_id.into(),
             pending_window_updates: store::Queue::new(),
@@ -79,6 +82,7 @@ where
             pending_accept: store::Queue::new(),
             buffer: Buffer::new(),
             refused: None,
+            is_push_enabled: config.local_push_enabled,
             _p: PhantomData,
         }
     }
@@ -429,10 +433,20 @@ where
         // TODO: Are there other rules?
         if P::is_server() {
             // The remote is a client and cannot reserve
+            trace!("recv_push_promise; error remote is client");
             return Err(RecvError::Connection(ProtocolError));
         }
 
         if !promised_id.is_server_initiated() {
+            trace!(
+                "recv_push_promise; error promised id is invalid {:?}",
+                promised_id
+            );
+            return Err(RecvError::Connection(ProtocolError));
+        }
+
+        if !self.is_push_enabled {
+            trace!("recv_push_promise; error push is disabled");
             return Err(RecvError::Connection(ProtocolError));
         }
 

src/proto/streams/send.rs

@@ -35,7 +35,7 @@ where
 
         Send {
             next_stream_id: next_stream_id.into(),
-            init_window_sz: config.init_local_window_sz,
+            init_window_sz: config.local_init_window_sz,
             prioritize: Prioritize::new(config),
         }
     }

src/proto/streams/state.rs

@@ -285,6 +285,7 @@ impl State {
                 ..
             } => true,
             HalfClosedLocal(AwaitingHeaders) => true,
+            ReservedRemote => true,
             _ => false,
         }
     }