109 lines
3.0 KiB
Rust
109 lines
3.0 KiB
Rust
use ConnectionError;
|
|
use frame::{self, Frame};
|
|
|
|
use futures::*;
|
|
|
|
pub struct Settings<T> {
|
|
inner: T,
|
|
// Our settings
|
|
local: frame::SettingSet,
|
|
// Peer settings
|
|
remote: frame::SettingSet,
|
|
// Number of acks remaining to send to the peer
|
|
remaining_acks: usize,
|
|
// True when the local settings must be flushed to the remote
|
|
is_dirty: bool,
|
|
}
|
|
|
|
impl<T> Settings<T>
|
|
where T: Stream<Item = Frame, Error = ConnectionError>,
|
|
T: Sink<SinkItem = Frame, SinkError = ConnectionError>,
|
|
{
|
|
pub fn new(inner: T) -> Settings<T> {
|
|
Settings {
|
|
inner: inner,
|
|
local: frame::SettingSet::default(),
|
|
remote: frame::SettingSet::default(),
|
|
remaining_acks: 0,
|
|
// Always start in the dirty state as sending the settings frame is
|
|
// part of the connection handshake
|
|
is_dirty: true,
|
|
}
|
|
}
|
|
|
|
fn has_pending_sends(&self) -> bool {
|
|
self.is_dirty || self.remaining_acks > 0
|
|
}
|
|
|
|
fn try_send_pending(&mut self) -> Poll<(), ConnectionError> {
|
|
if self.is_dirty {
|
|
// Create the new frame
|
|
let frame = frame::Settings::new(self.local.clone()).into();
|
|
try_ready!(self.try_send(frame));
|
|
|
|
self.is_dirty = false;
|
|
}
|
|
|
|
unimplemented!();
|
|
}
|
|
|
|
fn try_send(&mut self, item: frame::Frame) -> Poll<(), ConnectionError> {
|
|
if let AsyncSink::NotReady(_) = try!(self.inner.start_send(item)) {
|
|
// Ensure that call to `poll_complete` guarantee is called to satisfied
|
|
try!(self.inner.poll_complete());
|
|
|
|
return Ok(Async::NotReady);
|
|
}
|
|
|
|
Ok(Async::Ready(()))
|
|
}
|
|
}
|
|
|
|
impl<T> Stream for Settings<T>
|
|
where T: Stream<Item = Frame, Error = ConnectionError>,
|
|
T: Sink<SinkItem = Frame, SinkError = ConnectionError>,
|
|
{
|
|
type Item = Frame;
|
|
type Error = ConnectionError;
|
|
|
|
fn poll(&mut self) -> Poll<Option<Frame>, ConnectionError> {
|
|
self.inner.poll()
|
|
}
|
|
}
|
|
|
|
impl<T> Sink for Settings<T>
|
|
where T: Stream<Item = Frame, Error = ConnectionError>,
|
|
T: Sink<SinkItem = Frame, SinkError = ConnectionError>,
|
|
{
|
|
type SinkItem = Frame;
|
|
type SinkError = ConnectionError;
|
|
|
|
fn start_send(&mut self, item: Frame) -> StartSend<Frame, ConnectionError> {
|
|
// Settings frames take priority, so `item` cannot be sent if there are
|
|
// any pending acks OR the local settings have been changed w/o sending
|
|
// an associated frame.
|
|
if self.has_pending_sends() {
|
|
// Try to flush them
|
|
try!(self.poll_complete());
|
|
|
|
if self.has_pending_sends() {
|
|
return Ok(AsyncSink::NotReady(item));
|
|
}
|
|
}
|
|
|
|
self.inner.start_send(item)
|
|
}
|
|
|
|
fn poll_complete(&mut self) -> Poll<(), ConnectionError> {
|
|
self.inner.poll_complete()
|
|
}
|
|
|
|
fn close(&mut self) -> Poll<(), ConnectionError> {
|
|
if self.has_pending_sends() {
|
|
try_ready!(self.poll_complete());
|
|
}
|
|
|
|
self.inner.close()
|
|
}
|
|
}
|