use crate::{async_trait, Context, Middleware, Next, Result, State};
use std::sync::Arc;
struct Join<S>(Vec<Arc<dyn Middleware<S>>>);
impl<S> Join<S> {
#[inline]
fn new(middlewares: Vec<Arc<dyn Middleware<S>>>) -> Self {
Self(middlewares)
}
}
#[async_trait(?Send)]
impl<S: State> Middleware<S> for Join<S> {
#[inline]
async fn handle(self: Arc<Self>, ctx: Context<S>, mut next: Next) -> Result {
for middleware in self.0.iter().rev() {
let ctx = unsafe { ctx.unsafe_clone() };
let middleware = middleware.clone();
next = middleware.handle(ctx, next)
}
next.await
}
}
#[inline]
pub fn join<S: State>(
current: Arc<dyn Middleware<S>>,
next: impl Middleware<S>,
) -> impl Middleware<S> {
join_all(vec![current, Arc::new(next)])
}
#[inline]
pub fn join_all<S: State>(
middlewares: Vec<Arc<dyn Middleware<S>>>,
) -> impl Middleware<S> {
Join::new(middlewares)
}
#[cfg(all(test, feature = "runtime"))]
mod tests {
use crate::{join_all, App, Middleware, Next, Request};
use futures::lock::Mutex;
use http::StatusCode;
use std::sync::Arc;
#[async_std::test]
async fn middleware_order() -> Result<(), Box<dyn std::error::Error>> {
let vector = Arc::new(Mutex::new(Vec::new()));
let mut middlewares = Vec::<Arc<dyn Middleware<()>>>::new();
for i in 0..100 {
let vec = vector.clone();
middlewares.push(Arc::new(move |_ctx, next: Next| {
let vec = vec.clone();
async move {
vec.lock().await.push(i);
next.await?;
vec.lock().await.push(i);
Ok(())
}
}));
}
let service = App::new(()).gate(join_all(middlewares)).fake_service();
let resp = service.serve(Request::default()).await?;
assert_eq!(StatusCode::OK, resp.status);
for i in 0..100 {
assert_eq!(i, vector.lock().await[i]);
assert_eq!(i, vector.lock().await[199 - i]);
}
Ok(())
}
}