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use crate::{
body::{boxed, Body},
response::Response,
};
use http::Request;
use http_body::Empty;
use pin_project_lite::pin_project;
use std::{
convert::Infallible,
fmt,
future::Future,
pin::Pin,
task::{Context, Poll},
};
use tower::{
util::{BoxCloneService, Oneshot},
ServiceExt,
};
use tower_service::Service;
pub struct Route<B = Body, E = Infallible>(pub(crate) BoxCloneService<Request<B>, Response, E>);
impl<B, E> Route<B, E> {
pub(super) fn new<T>(svc: T) -> Self
where
T: Service<Request<B>, Response = Response, Error = E> + Clone + Send + 'static,
T::Future: Send + 'static,
{
Self(BoxCloneService::new(svc))
}
}
impl<ReqBody, E> Clone for Route<ReqBody, E> {
fn clone(&self) -> Self {
Self(self.0.clone())
}
}
impl<ReqBody, E> fmt::Debug for Route<ReqBody, E> {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.debug_struct("Route").finish()
}
}
impl<B, E> Service<Request<B>> for Route<B, E> {
type Response = Response;
type Error = E;
type Future = RouteFuture<B, E>;
#[inline]
fn poll_ready(&mut self, _cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Poll::Ready(Ok(()))
}
#[inline]
fn call(&mut self, req: Request<B>) -> Self::Future {
RouteFuture::new(self.0.clone().oneshot(req))
}
}
pin_project! {
pub struct RouteFuture<B, E> {
#[pin]
future: Oneshot<
BoxCloneService<Request<B>, Response, E>,
Request<B>,
>,
strip_body: bool,
}
}
impl<B, E> RouteFuture<B, E> {
pub(crate) fn new(
future: Oneshot<BoxCloneService<Request<B>, Response, E>, Request<B>>,
) -> Self {
RouteFuture {
future,
strip_body: false,
}
}
pub(crate) fn strip_body(mut self, strip_body: bool) -> Self {
self.strip_body = strip_body;
self
}
}
impl<B, E> Future for RouteFuture<B, E> {
type Output = Result<Response, E>;
#[inline]
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let strip_body = self.strip_body;
match self.project().future.poll(cx) {
Poll::Ready(Ok(res)) => {
if strip_body {
Poll::Ready(Ok(res.map(|_| boxed(Empty::new()))))
} else {
Poll::Ready(Ok(res))
}
}
Poll::Ready(Err(err)) => Poll::Ready(Err(err)),
Poll::Pending => Poll::Pending,
}
}
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn traits() {
use crate::test_helpers::*;
assert_send::<Route<()>>();
}
}