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use crate::{Change, Discover};
use futures_core::{ready, TryStream};
use pin_project::pin_project;
use std::hash::Hash;
use std::{
pin::Pin,
task::{Context, Poll},
};
use tower_service::Service;
#[pin_project]
#[derive(Debug)]
pub struct ServiceStream<S> {
#[pin]
inner: S,
}
impl<S> ServiceStream<S> {
#[allow(missing_docs)]
pub fn new<K, Svc, Request>(services: S) -> Self
where
S: TryStream<Ok = Change<K, Svc>>,
K: Hash + Eq,
Svc: Service<Request>,
{
ServiceStream { inner: services }
}
}
impl<S, K, Svc> Discover for ServiceStream<S>
where
K: Hash + Eq,
S: TryStream<Ok = Change<K, Svc>>,
{
type Key = K;
type Service = Svc;
type Error = S::Error;
fn poll_discover(
self: Pin<&mut Self>,
cx: &mut Context<'_>,
) -> Poll<Result<Change<Self::Key, Self::Service>, Self::Error>> {
match ready!(self.project().inner.try_poll_next(cx)).transpose()? {
Some(c) => Poll::Ready(Ok(c)),
None => {
Poll::Pending
}
}
}
}