add Server Builder

src/server.rs

@@ -1,6 +1,5 @@
 use codec::{Codec, RecvError};
 use frame::{self, Reason, Settings, StreamId};
-use frame::Reason::*;
 use proto::{self, Connection, WindowSize};
 
 use bytes::{Buf, Bytes, IntoBuf};
@@ -21,6 +20,12 @@ pub struct Server<T, B: IntoBuf> {
     connection: Connection<T, Peer, B>,
 }
 
+/// Build a Server
+#[derive(Debug, Default)]
+pub struct Builder {
+    settings: Settings,
+}
+
 #[derive(Debug)]
 pub struct Stream<B: IntoBuf> {
     inner: proto::StreamRef<B::Buf, Peer>,
@@ -63,8 +68,19 @@ impl<T> Server<T, Bytes>
 where
     T: AsyncRead + AsyncWrite + 'static,
 {
+    /// Bind an H2 server connection.
+    ///
+    /// Returns a future which resolves to the connection value once the H2
+    /// handshake has been completed.
     pub fn handshake(io: T) -> Handshake<T, Bytes> {
-        Server::handshake2(io)
+        Server::builder().handshake(io)
+    }
+}
+
+impl Server<(), Bytes> {
+    /// Create a Server Builder
+    pub fn builder() -> Builder {
+        Builder::default()
     }
 }
 
@@ -73,27 +89,20 @@ where
     T: AsyncRead + AsyncWrite + 'static,
     B: IntoBuf + 'static,
 {
-    /// Bind an H2 server connection.
-    ///
-    /// Returns a future which resolves to the connection value once the H2
-    /// handshake has been completed.
-    pub fn handshake2(io: T) -> Handshake<T, B> {
+    fn handshake2(io: T, settings: Settings) -> Handshake<T, B> {
         // Create the codec
         let mut codec = Codec::new(io);
 
-        // Create the initial SETTINGS frame
-        let settings = Settings::default();
-
         // Send initial settings frame
         codec
-            .buffer(settings.into())
+            .buffer(settings.clone().into())
             .expect("invalid SETTINGS frame");
 
         // Flush pending settings frame and then wait for the client preface
         let handshake = Flush::new(codec)
             .and_then(ReadPreface::new)
             .map(move |codec| {
-                let connection = Connection::new(codec, &Settings::default());
+                let connection = Connection::new(codec, &settings);
                 Server {
                     connection,
                 }
@@ -162,6 +171,27 @@ where
     }
 }
 
+// ===== impl Builder =====
+
+impl Builder {
+    /// Set the initial window size of the remote peer.
+    pub fn initial_window_size(&mut self, size: u32) -> &mut Self {
+        self.settings.set_initial_window_size(Some(size));
+        self
+    }
+
+    /// Bind an H2 server connection.
+    ///
+    /// Returns a future which resolves to the connection value once the H2
+    /// handshake has been completed.
+    pub fn handshake<T, B>(&self, io: T) -> Handshake<T, B>
+        where T: AsyncRead + AsyncWrite + 'static,
+              B: IntoBuf + 'static
+    {
+        Server::handshake2(io, self.settings.clone())
+    }
+}
+
 // ===== impl Stream =====
 
 impl<B: IntoBuf> Stream<B> {
@@ -367,7 +397,7 @@ where
 
             if PREFACE[self.pos..self.pos + n] != buf[..n] {
                 // TODO: Should this just write the GO_AWAY frame directly?
-                return Err(ProtocolError.into());
+                return Err(Reason::ProtocolError.into());
             }
 
             self.pos += n;
@@ -450,7 +480,7 @@ impl proto::Peer for Peer {
             () => {
                 return Err(RecvError::Stream {
                     id: stream_id,
-                    reason: ProtocolError,
+                    reason: Reason::ProtocolError,
                 });
             }
         };
@@ -465,7 +495,7 @@ impl proto::Peer for Peer {
 
         // Specifying :status for a request is a protocol error
         if pseudo.status.is_some() {
-            return Err(RecvError::Connection(ProtocolError));
+            return Err(RecvError::Connection(Reason::ProtocolError));
         }
 
         // Convert the URI
@@ -502,7 +532,7 @@ impl proto::Peer for Peer {
                 // kinds of errors
                 return Err(RecvError::Stream {
                     id: stream_id,
-                    reason: ProtocolError,
+                    reason: Reason::ProtocolError,
                 });
             },
         };