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use std::{
pin::Pin,
task::{Context, Poll},
};
use futures_util::{Future, FutureExt};
use pin_project_lite::pin_project;
use tower::{Layer, Service};
use crate::{request::BoxRequest, response::BoxResponse};
#[derive(Clone)]
pub struct ModifyLayer<ModifyReq, ModifyResp> {
req_fn: ModifyReq,
resp_fn: ModifyResp,
}
impl<ModifyReq, ModifyResp> ModifyLayer<ModifyReq, ModifyResp>
where
ModifyReq: Fn(&mut BoxRequest),
ModifyResp: Fn(&mut BoxResponse),
{
pub fn new(req_fn: ModifyReq, resp_fn: ModifyResp) -> Self {
Self { req_fn, resp_fn }
}
}
impl<ModifyReq> ModifyLayer<ModifyReq, fn(&mut BoxResponse)>
where
ModifyReq: Fn(&mut BoxRequest),
{
pub fn new_request(f: ModifyReq) -> Self {
Self::new(f, |_| ())
}
}
impl<ModifyResp> ModifyLayer<fn(&mut BoxRequest), ModifyResp>
where
ModifyResp: Fn(&mut BoxResponse),
{
pub fn new_response(f: ModifyResp) -> Self {
Self::new(|_| (), f)
}
}
impl<ModifyReq, ModifyResp, S> Layer<S> for ModifyLayer<ModifyReq, ModifyResp>
where
ModifyReq: Clone,
ModifyResp: Clone,
{
type Service = Modify<ModifyReq, ModifyResp, S>;
fn layer(&self, inner: S) -> Self::Service {
Modify::new(inner, self.req_fn.clone(), self.resp_fn.clone())
}
}
#[derive(Clone)]
pub struct Modify<ModifyReq, ModifyResp, S> {
inner: S,
req_fn: ModifyReq,
resp_fn: ModifyResp,
}
impl<ModifyReq, ModifyResp, S> Modify<ModifyReq, ModifyResp, S> {
pub fn new(inner: S, req_fn: ModifyReq, resp_fn: ModifyResp) -> Self {
Self {
inner,
req_fn,
resp_fn,
}
}
}
impl<ModifyReq, ModifyResp, S> Service<BoxRequest> for Modify<ModifyReq, ModifyResp, S>
where
S: Service<BoxRequest, Response = BoxResponse>,
ModifyReq: Fn(&mut BoxRequest),
ModifyResp: Fn(&mut BoxResponse) + Clone,
{
type Response = BoxResponse;
type Error = S::Error;
type Future = ModifyFuture<ModifyResp, S::Future>;
fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
Service::poll_ready(&mut self.inner, cx)
}
fn call(&mut self, mut req: BoxRequest) -> Self::Future {
(self.req_fn)(&mut req);
ModifyFuture {
fut: Service::call(&mut self.inner, req),
resp_fn: self.resp_fn.clone(),
}
}
}
pin_project! {
pub struct ModifyFuture<ModifyResp, Fut> {
#[pin]
fut: Fut,
resp_fn: ModifyResp,
}
}
impl<ModifyResp, Fut, Err> Future for ModifyFuture<ModifyResp, Fut>
where
Fut: Future<Output = Result<BoxResponse, Err>>,
ModifyResp: Fn(&mut BoxResponse),
{
type Output = Result<BoxResponse, Err>;
fn poll(self: Pin<&mut Self>, cx: &mut Context<'_>) -> Poll<Self::Output> {
let mut this = self.project();
this.fut.poll_unpin(cx).map_ok(|mut resp| {
(this.resp_fn)(&mut resp);
resp
})
}
}