Created
October 7, 2020 17:38
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use actix_service::{Service, Transform}; | |
use futures_util::future::{self, FutureExt as _, LocalBoxFuture}; | |
use std::{cell::RefCell, future::Future, rc::Rc}; | |
#[derive(Clone, Debug)] | |
pub struct Preprocess<F>(pub F); | |
pub struct PreprocessService<S, F> { | |
service: Rc<RefCell<S>>, | |
f: F, | |
} | |
impl<S, F, R> Transform<S> for Preprocess<F> | |
where | |
S: Service + 'static, | |
F: FnMut(S::Request) -> R + Clone + 'static, | |
R: Future<Output = Result<S::Request, S::Error>>, | |
{ | |
type Request = S::Request; | |
type Response = S::Response; | |
type Error = S::Error; | |
type Transform = PreprocessService<S, F>; | |
type InitError = (); | |
type Future = future::Ready<Result<Self::Transform, Self::InitError>>; | |
fn new_transform(&self, service: S) -> Self::Future { | |
future::ok(PreprocessService { | |
service: Rc::new(RefCell::new(service)), | |
f: self.0.clone(), | |
}) | |
} | |
} | |
impl<S, F, R> Service for PreprocessService<S, F> | |
where | |
S: Service + 'static, | |
F: FnMut(S::Request) -> R + Clone + 'static, | |
R: Future<Output = Result<S::Request, S::Error>>, | |
{ | |
type Request = S::Request; | |
type Response = S::Response; | |
type Error = S::Error; | |
type Future = LocalBoxFuture<'static, Result<S::Response, S::Error>>; | |
fn poll_ready( | |
&mut self, | |
ctx: &mut std::task::Context<'_>, | |
) -> std::task::Poll<Result<(), Self::Error>> { | |
self.service.borrow_mut().poll_ready(ctx) | |
} | |
fn call(&mut self, req: Self::Request) -> Self::Future { | |
let mut f = self.f.clone(); | |
let service = Rc::clone(&self.service); | |
async move { | |
let req = f(req).await?; | |
let fut = service.borrow_mut().call(req); | |
fut.await | |
} | |
.boxed_local() | |
} | |
} |
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