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document h2 ping-pong

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This commit is contained in:
Rob Ede 2022-07-24 16:42:35 +01:00
parent 8ff489aa90
commit 4bbe60b609
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2 changed files with 24 additions and 17 deletions
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2
actix-http/src/config.rs
View file

@ -35,7 +35,7 @@ impl Default for ServiceConfig {
}
impl ServiceConfig {
/// Create instance of `ServiceConfig`
/// Create instance of `ServiceConfig`.
pub fn new(
keep_alive: KeepAlive,
client_request_timeout: Duration,

39
actix-http/src/h2/dispatcher.rs
View file

@ -67,7 +67,7 @@ where
timer
})
.unwrap_or_else(|| Box::pin(sleep(dur))),
on_flight: false,
in_flight: false,
ping_pong: conn.ping_pong().unwrap(),
});
@ -84,9 +84,14 @@ where
}
struct H2PingPong {
timer: Pin<Box<Sleep>>,
on_flight: bool,
/// Handle to send ping frames from the peer.
ping_pong: PingPong,
/// True when a ping has been sent and is waiting for a reply.
in_flight: bool,
/// Timeout for pong response.
timer: Pin<Box<Sleep>>,
}
impl<T, S, B, X, U> Future for Dispatcher<T, S, B, X, U>
@ -152,26 +157,28 @@ where
});
}
Poll::Ready(None) => return Poll::Ready(Ok(())),
Poll::Pending => match this.ping_pong.as_mut() {
Some(ping_pong) => loop {
if ping_pong.on_flight {
// When have on flight ping pong. poll pong and and keep alive timer.
// on success pong received update keep alive timer to determine the next timing of
// ping pong.
if ping_pong.in_flight {
// When there is an in-flight ping-pong, poll pong and and keep-alive
// timer. On successful pong received, update keep-alive timer to
// determine the next timing of ping pong.
match ping_pong.ping_pong.poll_pong(cx)? {
Poll::Ready(_) => {
ping_pong.on_flight = false;
ping_pong.in_flight = false;
let dead_line = this.config.keep_alive_deadline().unwrap();
ping_pong.timer.as_mut().reset(dead_line.into());
}
Poll::Pending => {
return ping_pong.timer.as_mut().poll(cx).map(|_| Ok(()))
return ping_pong.timer.as_mut().poll(cx).map(|_| Ok(()));
}
}
} else {
// When there is no on flight ping pong. keep alive timer is used to wait for next
// timing of ping pong. Therefore at this point it serves as an interval instead.
// When there is no in-flight ping-pong, keep-alive timer is used to
// wait for next timing of ping-pong. Therefore, at this point it serves
// as an interval instead.
ready!(ping_pong.timer.as_mut().poll(cx));
ping_pong.ping_pong.send_ping(Ping::opaque())?;
@ -179,7 +186,7 @@ where
let dead_line = this.config.keep_alive_deadline().unwrap();
ping_pong.timer.as_mut().reset(dead_line.into());
ping_pong.on_flight = true;
ping_pong.in_flight = true;
}
},
None => return Poll::Pending,
@ -287,13 +294,13 @@ fn prepare_response(
_ => {}
}
let _ = match size {
BodySize::None | BodySize::Stream => None,
match size {
BodySize::None | BodySize::Stream => {}
BodySize::Sized(0) => {
#[allow(clippy::declare_interior_mutable_const)]
const HV_ZERO: HeaderValue = HeaderValue::from_static("0");
res.headers_mut().insert(CONTENT_LENGTH, HV_ZERO)
res.headers_mut().insert(CONTENT_LENGTH, HV_ZERO);
}
BodySize::Sized(len) => {
@ -302,7 +309,7 @@ fn prepare_response(
res.headers_mut().insert(
CONTENT_LENGTH,
HeaderValue::from_str(buf.format(*len)).unwrap(),
)
);
}
};