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use std::{fmt, marker::PhantomData};
use futures_core::ready;
use std::{
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tower_service::Service;
pub struct ReadyOneshot<T, Request> {
inner: Option<T>,
_p: PhantomData<fn() -> Request>,
}
impl<T, Request> Unpin for ReadyOneshot<T, Request> {}
impl<T, Request> ReadyOneshot<T, Request>
where
T: Service<Request>,
{
#[allow(missing_docs)]
pub fn new(service: T) -> Self {
Self {
inner: Some(service),
_p: PhantomData,
}
}
}
impl<T, Request> Future for ReadyOneshot<T, Request>
where
T: Service<Request>,
{
type Output = Result<T, T::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
ready!(self
.inner
.as_mut()
.expect("poll after Poll::Ready")
.poll_ready(cx))?;
Poll::Ready(Ok(self.inner.take().expect("poll after Poll::Ready")))
}
}
impl<T, Request> fmt::Debug for ReadyOneshot<T, Request>
where
T: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("ReadyOneshot")
.field("inner", &self.inner)
.finish()
}
}
pub struct ReadyAnd<'a, T, Request>(ReadyOneshot<&'a mut T, Request>);
impl<'a, T, Request> Unpin for ReadyAnd<'a, T, Request> {}
impl<'a, T, Request> ReadyAnd<'a, T, Request>
where
T: Service<Request>,
{
#[allow(missing_docs)]
pub fn new(service: &'a mut T) -> Self {
Self(ReadyOneshot::new(service))
}
}
impl<'a, T, Request> Future for ReadyAnd<'a, T, Request>
where
T: Service<Request>,
{
type Output = Result<&'a mut T, T::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
Pin::new(&mut self.0).poll(cx)
}
}
impl<'a, T, Request> fmt::Debug for ReadyAnd<'a, T, Request>
where
T: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("ReadyAnd").field(&self.0).finish()
}
}
pub struct Ready<'a, T, Request>(ReadyAnd<'a, T, Request>);
impl<'a, T, Request> Unpin for Ready<'a, T, Request> {}
impl<'a, T, Request> Ready<'a, T, Request>
where
T: Service<Request>,
{
#[allow(missing_docs)]
#[deprecated(since = "0.3.1", note = "prefer `ReadyAnd` which yields the service")]
pub fn new(service: &'a mut T) -> Self {
Self(ReadyAnd::new(service))
}
}
impl<'a, T, Request> Future for Ready<'a, T, Request>
where
T: Service<Request>,
{
type Output = Result<(), T::Error>;
fn poll(mut self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let _ = ready!(Pin::new(&mut self.0).poll(cx));
Poll::Ready(Ok(()))
}
}
impl<'a, T, Request> fmt::Debug for Ready<'a, T, Request>
where
T: fmt::Debug,
{
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_tuple("Ready").field(&self.0).finish()
}
}