http-types-rs 4.0.3

Common types for HTTP operations.
Documentation 
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use async_channel::TryRecvError;

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

use crate::upgrade::Connection;

/// The receiving half of a channel to send an upgraded connection.
#[must_use = "Futures do nothing unless polled or .awaited"]
#[derive(Debug)]
pub struct Receiver {
    receiver: async_channel::Receiver<Connection>,
}

impl Receiver {
    /// Create a new instance of `Receiver`.
    #[allow(unused)]
    pub(crate) fn new(receiver: async_channel::Receiver<Connection>) -> Self {
        Self { receiver }
    }
}

impl Future for Receiver {
    type Output = Option<Connection>;

    fn poll(self: Pin<&mut Self>, _: &mut Context<'_>) -> Poll<Self::Output> {
        match self.receiver.try_recv() {
            Ok(conn) => Poll::Ready(Some(conn)),
            Err(TryRecvError::Closed) => Poll::Ready(None),
            Err(TryRecvError::Empty) => Poll::Pending,
        }
    }
}