Tweak ChannelBinding API

tokio-postgres-native-tls/src/lib.rs

@@ -60,11 +60,11 @@ where
 
     fn poll(&mut self) -> Poll<(TlsStream<S>, ChannelBinding), native_tls::Error> {
         let stream = try_ready!(self.0.poll());
-        let mut channel_binding = ChannelBinding::new();
 
-        if let Some(buf) = stream.get_ref().tls_server_end_point().unwrap_or(None) {
+        let channel_binding = match stream.get_ref().tls_server_end_point().unwrap_or(None) {
-            channel_binding = channel_binding.tls_server_end_point(buf);
+            Some(buf) => ChannelBinding::tls_server_end_point(buf),
-        }
+            None => ChannelBinding::none(),
+        };
 
         Ok(Async::Ready((stream, channel_binding)))
     }

tokio-postgres-openssl/src/lib.rs

@@ -60,10 +60,10 @@ where
     fn poll(&mut self) -> Poll<(SslStream<S>, ChannelBinding), HandshakeError<S>> {
         let stream = try_ready!(self.0.poll());
 
-        let mut channel_binding = ChannelBinding::new();
+        let channel_binding = match tls_server_end_point(stream.get_ref().ssl()) {
-        if let Some(buf) = tls_server_end_point(stream.get_ref().ssl()) {
+            Some(buf) => ChannelBinding::tls_server_end_point(buf),
-            channel_binding = channel_binding.tls_server_end_point(buf);
+            None => ChannelBinding::none(),
-        }
+        };
 
         Ok(Async::Ready((stream, channel_binding)))
     }

tokio-postgres/src/tls.rs

@@ -12,15 +12,16 @@ pub struct ChannelBinding {
 }
 
 impl ChannelBinding {
-    pub fn new() -> ChannelBinding {
+    pub fn none() -> ChannelBinding {
         ChannelBinding {
             tls_server_end_point: None,
         }
     }
 
-    pub fn tls_server_end_point(mut self, tls_server_end_point: Vec<u8>) -> ChannelBinding {
+    pub fn tls_server_end_point(tls_server_end_point: Vec<u8>) -> ChannelBinding {
-        self.tls_server_end_point = Some(tls_server_end_point);
+        ChannelBinding {
-        self
+            tls_server_end_point: Some(tls_server_end_point),
+        }
     }
 }
 
@@ -60,7 +61,7 @@ where
     fn handle_tls(self, use_tls: bool, stream: S) -> FutureResult<(S, ChannelBinding), Void> {
         debug_assert!(!use_tls);
 
-        future::ok((stream, ChannelBinding::new()))
+        future::ok((stream, ChannelBinding::none()))
     }
 }
 
@@ -113,7 +114,7 @@ where
             }
             PreferTlsFutureInner::Raw(s) => Ok(Async::Ready((
                 MaybeTlsStream::Raw(s.take().expect("future polled after completion")),
-                ChannelBinding::new(),
+                ChannelBinding::none(),
             ))),
         }
     }