rama-ws 0.3.0

WebSocket (WS) support for rama
Documentation 
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56

use std::{
    io::{Read, Write},
    pin::Pin,
    task::{Context, Poll},
};

use rama_core::io::Io;
use rama_core::telemetry::tracing::trace;

use crate::{
    protocol::WebSocket,
    runtime::{AsyncWebSocket, compat::AllowStd},
};

pub(crate) async fn without_handshake<F, S>(stream: S, f: F) -> AsyncWebSocket<S>
where
    F: FnOnce(AllowStd<S>) -> WebSocket<AllowStd<S>> + Unpin,
    S: Io + Unpin,
{
    let start = SkippedHandshakeFuture(Some(SkippedHandshakeFutureInner { f, stream }));

    let ws = start.await;

    AsyncWebSocket::new(ws)
}

struct SkippedHandshakeFuture<F, S>(Option<SkippedHandshakeFutureInner<F, S>>);
struct SkippedHandshakeFutureInner<F, S> {
    f: F,
    stream: S,
}

impl<F, S> Future for SkippedHandshakeFuture<F, S>
where
    F: FnOnce(AllowStd<S>) -> WebSocket<AllowStd<S>> + Unpin,
    S: Unpin,
    AllowStd<S>: Read + Write,
{
    type Output = WebSocket<AllowStd<S>>;

    fn poll(self: Pin<&mut Self>, ctx: &mut Context<'_>) -> Poll<Self::Output> {
        #[expect(
            clippy::expect_used,
            reason = "Polling convention makes this semi-ok; we can always revisit later if needed"
        )]
        let inner = self
            .get_mut()
            .0
            .take()
            .expect("future polled after completion");
        trace!("Setting context when skipping handshake");
        let stream = AllowStd::new(inner.stream, ctx.waker());

        Poll::Ready((inner.f)(stream))
    }
}