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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> {
fn new(middlewares: Vec<Arc<dyn Middleware<S>>>) -> Self {
Self(middlewares)
}
}
#[async_trait]
impl<S: State> Middleware<S> for Join<S> {
async fn handle(self: Arc<Self>, ctx: Context<S>, mut next: Next) -> Result {
for middleware in self.0.iter().rev() {
let ctx = ctx.clone();
let middleware = middleware.clone();
next = Box::new(move || middleware.handle(ctx, next))
}
next().await
}
}
pub fn join<S: State>(
current: Arc<dyn Middleware<S>>,
next: impl Middleware<S>,
) -> impl Middleware<S> {
join_all(vec![current, Arc::new(next)])
}
pub fn join_all<S: State>(middlewares: Vec<Arc<dyn Middleware<S>>>) -> impl Middleware<S> {
Join::new(middlewares)
}
#[cfg(test)]
mod tests {
use crate::{join_all, App, Middleware, Next};
use async_std::task::spawn;
use futures::lock::Mutex;
use http::StatusCode;
use std::sync::Arc;
#[tokio::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 (addr, server) = App::new(()).gate(join_all(middlewares)).run_local()?;
spawn(server);
let resp = reqwest::get(&format!("http://{}", addr)).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(())
}
}