predawn 0.9.0

Predawn is a Rust web framework like Spring Boot.
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
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81

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

use futures_core::Stream;
use futures_util::{sink::Sink, SinkExt, StreamExt};
use http::HeaderValue;
use hyper::upgrade::Upgraded;
use hyper_util::rt::TokioIo;
use tokio_tungstenite::{tungstenite, WebSocketStream};

use super::Message;

#[derive(Debug)]
pub struct WebSocket {
    pub(crate) inner: WebSocketStream<TokioIo<Upgraded>>,
    pub(crate) protocol: Option<HeaderValue>,
}

impl WebSocket {
    /// Receive another message.
    ///
    /// Returns `None` if the stream has closed.
    pub async fn recv(&mut self) -> Option<Result<Message, tungstenite::Error>> {
        self.next().await
    }

    /// Send a message.
    pub async fn send(&mut self, msg: Message) -> Result<(), tungstenite::Error> {
        self.inner.send(msg.into_tungstenite()).await
    }

    /// Gracefully close this WebSocket.
    pub async fn close(mut self) -> Result<(), tungstenite::Error> {
        self.inner.close(None).await
    }

    /// Return the selected WebSocket subprotocol, if one has been chosen.
    pub fn protocol(&self) -> Option<&HeaderValue> {
        self.protocol.as_ref()
    }
}

impl Stream for WebSocket {
    type Item = Result<Message, tungstenite::Error>;

    fn poll_next(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Option<Self::Item>> {
        loop {
            match std::task::ready!(self.inner.poll_next_unpin(cx)) {
                Some(Ok(msg)) => {
                    if let Some(msg) = Message::from_tungstenite(msg) {
                        return Poll::Ready(Some(Ok(msg)));
                    }
                }
                Some(Err(e)) => return Poll::Ready(Some(Err(e))),
                None => return Poll::Ready(None),
            }
        }
    }
}

impl Sink<Message> for WebSocket {
    type Error = tungstenite::Error;

    fn poll_ready(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        Pin::new(&mut self.inner).poll_ready(cx)
    }

    fn start_send(mut self: Pin<&mut Self>, item: Message) -> Result<(), Self::Error> {
        Pin::new(&mut self.inner).start_send(item.into_tungstenite())
    }

    fn poll_flush(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        Pin::new(&mut self.inner).poll_flush(cx)
    }

    fn poll_close(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
        Pin::new(&mut self.inner).poll_close(cx)
    }
}