Remove additive flag (#98)

CHANGELOG.md

@@ -1,3 +1,11 @@
+# 0.8.0
+
+- Upgrade step 4 of 4. This version always assumes the new semantics and
+  no longer sets the non-standard flag in intial window updates.
+- The configuration option `lazy_open` is removed. Initial window updates
+  are sent automatically if the receive window is configured to be larger
+  than the default.
+
 # 0.7.0
 
 Upgrade step 3 of 4. This version sets the non-standard flag, but

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "yamux"
-version = "0.7.0"
+version = "0.8.0"
 authors = ["Parity Technologies <admin@parity.io>"]
 license = "Apache-2.0 OR MIT"
 description = "Multiplexer over reliable, ordered connections"

src/connection.rs

@@ -467,7 +467,6 @@ impl<T: AsyncRead + AsyncWrite + Unpin> Connection<T> {
                 if extra_credit > 0 {
                     let mut frame = Frame::window_update(id, extra_credit);
                     frame.header_mut().syn();
-                    frame.header_mut().additive();
                     log::trace!("{}: sending initial {}", self.id, frame.header());
                     self.socket.get_mut().send(&frame).await.or(Err(ConnectionError::Closed))?
                 }

src/frame/header.rs

@@ -99,11 +99,6 @@ impl<T: HasSyn> Header<T> {
     pub fn syn(&mut self) {
         self.flags.0 |= SYN.0
     }
-
-    /// Set the [`ADD`] flag.
-    pub fn additive(&mut self) {
-        self.flags.0 |= ADD.0
-    }
 }
 
 impl<T: HasAck> Header<T> {
@@ -349,10 +344,6 @@ pub const FIN: Flags = Flags(4);
 /// Indicates an immediate stream reset.
 pub const RST: Flags = Flags(8);
 
-/// Temporary flag indicating that the initial window update is additive.
-/// (See https://github.com/paritytech/yamux/issues/92)
-pub const ADD: Flags = Flags(0x8000);
-
 /// The serialised header size in bytes.
 pub const HEADER_SIZE: usize = 12;
 

src/lib.rs

@@ -133,23 +133,6 @@ impl Config {
         self.read_after_close = b;
         self
     }
-
-    /// Enable or disable the sending of an initial window update frame
-    /// when opening outbound streams.
-    ///
-    /// When enabled, opening a new outbound stream will not result in an
-    /// immediate send of a frame, instead the first outbound data frame
-    /// will be marked as opening a stream.
-    ///
-    /// When disabled (the current default), opening a new outbound
-    /// stream will result in a window update frame being sent immediately
-    /// to the remote. This allows opening a stream with a custom receive
-    /// window size (cf. [`Config::set_receive_window`]) which the remote
-    /// can directly make use of.
-    #[deprecated(since = "0.6.0")]
-    pub fn set_lazy_open(&mut self, _: bool) -> &mut Self {
-        self
-    }
 }
 
 // Check that we can safely cast a `usize` to a `u64`.