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#[cfg(feature = "stream")]
use futures_core::Stream;
#[cfg(feature = "stream")]
use pin_project::pin_project;
use crate::common::{
task::{self, Poll},
Pin,
};
pub trait Accept {
type Conn;
type Error;
fn poll_accept(
self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Result<Self::Conn, Self::Error>>>;
}
pub fn poll_fn<F, IO, E>(func: F) -> impl Accept<Conn = IO, Error = E>
where
F: FnMut(&mut task::Context<'_>) -> Poll<Option<Result<IO, E>>>,
{
struct PollFn<F>(F);
impl<F> Unpin for PollFn<F> {}
impl<F, IO, E> Accept for PollFn<F>
where
F: FnMut(&mut task::Context<'_>) -> Poll<Option<Result<IO, E>>>,
{
type Conn = IO;
type Error = E;
fn poll_accept(
self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
(self.get_mut().0)(cx)
}
}
PollFn(func)
}
#[cfg(feature = "stream")]
pub fn from_stream<S, IO, E>(stream: S) -> impl Accept<Conn = IO, Error = E>
where
S: Stream<Item = Result<IO, E>>,
{
#[pin_project]
struct FromStream<S>(#[pin] S);
impl<S, IO, E> Accept for FromStream<S>
where
S: Stream<Item = Result<IO, E>>,
{
type Conn = IO;
type Error = E;
fn poll_accept(
self: Pin<&mut Self>,
cx: &mut task::Context<'_>,
) -> Poll<Option<Result<Self::Conn, Self::Error>>> {
self.project().0.poll_next(cx)
}
}
FromStream(stream)
}