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use futures::future::{BoxFuture, FutureExt, TryFutureExt};
use reqwest::{Client, Request, Response};
use std::sync::Arc;
use truelayer_extensions::Extensions;
use crate::error::{Error, Result};
#[async_trait::async_trait]
pub trait Middleware: 'static + Send + Sync {
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response>;
}
#[async_trait::async_trait]
impl<F> Middleware for F
where
F: Send
+ Sync
+ 'static
+ for<'a> Fn(Request, &'a mut Extensions, Next<'a>) -> BoxFuture<'a, Result<Response>>,
{
async fn handle(
&self,
req: Request,
extensions: &mut Extensions,
next: Next<'_>,
) -> Result<Response> {
(self)(req, extensions, next).await
}
}
#[derive(Clone)]
pub struct Next<'a> {
client: &'a Client,
middlewares: &'a [Arc<dyn Middleware>],
}
impl<'a> Next<'a> {
pub(crate) fn new(client: &'a Client, middlewares: &'a [Arc<dyn Middleware>]) -> Self {
Next {
client,
middlewares,
}
}
pub fn run(
mut self,
req: Request,
extensions: &'a mut Extensions,
) -> BoxFuture<'a, Result<Response>> {
if let Some((current, rest)) = self.middlewares.split_first() {
self.middlewares = rest;
current.handle(req, extensions, self).boxed()
} else {
self.client.execute(req).map_err(Error::from).boxed()
}
}
}