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use std::cell::RefCell;
use std::future::Future;
use std::pin::Pin;
use actix_web::dev::{MessageBody, Service, ServiceRequest, ServiceResponse, Transform};
use crate::builder::FlashMessagesFramework;
use crate::{storage::FlashMessageStore, FlashMessage, Level};
use actix_web::HttpMessage;
use std::sync::Arc;
tokio::task_local! {
pub(crate) static OUTGOING_MAILBOX: OutgoingMailbox;
}
#[derive(Clone)]
pub(crate) struct OutgoingMailbox {
pub(crate) messages: RefCell<Vec<FlashMessage>>,
pub(crate) minimum_level: Level,
}
impl OutgoingMailbox {
pub(crate) fn new(minimum_level: Level) -> Self {
Self {
messages: RefCell::new(vec![]),
minimum_level,
}
}
}
impl<S, B> Transform<S, ServiceRequest> for FlashMessagesFramework
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>,
S::Future: 'static,
B: MessageBody + 'static,
{
type Response = ServiceResponse<B>;
type Error = actix_web::Error;
type Transform = FlashMessagesMiddleware<S>;
type InitError = ();
type Future = std::future::Ready<Result<Self::Transform, Self::InitError>>;
fn new_transform(&self, service: S) -> Self::Future {
std::future::ready(Ok(FlashMessagesMiddleware {
service,
storage_backend: self.storage_backend.clone(),
minimum_level: self.minimum_level,
}))
}
}
#[non_exhaustive]
#[doc(hidden)]
pub struct FlashMessagesMiddleware<S> {
service: S,
storage_backend: Arc<dyn FlashMessageStore>,
minimum_level: Level,
}
#[allow(clippy::type_complexity)]
impl<S, B> Service<ServiceRequest> for FlashMessagesMiddleware<S>
where
S: Service<ServiceRequest, Response = ServiceResponse<B>, Error = actix_web::Error>,
S::Future: 'static,
B: MessageBody + 'static,
{
type Response = ServiceResponse<B>;
type Error = actix_web::Error;
type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
actix_web::dev::forward_ready!(service);
fn call(&self, req: ServiceRequest) -> Self::Future {
req.extensions_mut().insert(self.storage_backend.clone());
let outgoing_mailbox = OutgoingMailbox::new(self.minimum_level);
let future =
OUTGOING_MAILBOX.sync_scope(outgoing_mailbox.clone(), move || self.service.call(req));
let storage_backend = self.storage_backend.clone();
Box::pin(OUTGOING_MAILBOX.scope(outgoing_mailbox, async move {
let response: Result<Self::Response, Self::Error> = future.await;
response.map(|mut response| {
OUTGOING_MAILBOX
.with(|m| {
storage_backend.store(
&m.messages.borrow(),
response.request().clone(),
response.response_mut().head_mut(),
)
})
.unwrap();
response
})
}))
}
}