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//! Request/Response body buffering with support spooled to a temp file on disk
//!
//! Use it in actix-web middleware.
//!
//! # Example:
//! ```ignore
//! use std::{
//!     cell::RefCell,
//!     pin::Pin,
//!     rc::Rc,
//!     sync::Arc,
//!     task::{Context, Poll},
//! };
//!
//! use actix_service::Transform;
//! use actix_web::{
//!     dev::{Body, Service, ServiceRequest, ServiceResponse},
//!     web,
//!     web::BytesMut,
//!     App, Error, HttpMessage, HttpResponse, HttpServer, Responder,
//! };
//! use actix_web_buffering::{
//!     enable_request_buffering, enable_response_buffering, FileBufferingStreamWrapper,
//! };
//! use futures::{
//!     future::{ok, Ready},
//!     stream::StreamExt,
//!     Future, FutureExt,
//! };
//!
//! #[actix_web::main]
//! async fn main() -> std::io::Result<()> {
//!     let wrapper = FileBufferingStreamWrapper::new()
//!         .tmp_dir(std::env::temp_dir())
//!         .threshold(1024 * 30)
//!         .produce_chunk_size(1024 * 30)
//!         .buffer_limit(Some(1024 * 30 * 10));
//!
//!     let wrapper = Arc::new(wrapper);
//!
//!     HttpServer::new(move || {
//!         let r1 = Arc::clone(&wrapper);
//!         let r2 = Arc::clone(&wrapper);
//!         App::new()
//!             .wrap(Example(r1))
//!             .wrap(Example(r2))
//!             .service(web::resource("/").route(web::post().to(echo)))
//!     })
//!     .bind("127.0.0.1:8080")?
//!     .run()
//!     .await
//! }
//!
//! async fn echo(req_body: String) -> impl Responder {
//!     HttpResponse::Ok().body(req_body)
//! }
//!
//! struct Example(Arc<FileBufferingStreamWrapper>);
//!
//! impl<S> Transform<S> for Example
//! where
//!     S: Service<Request = ServiceRequest, Response = ServiceResponse<Body>, Error = Error> + 'static,
//! {
//!     type Request = ServiceRequest;
//!     type Response = ServiceResponse<Body>;
//!     type Error = Error;
//!     type InitError = ();
//!     type Transform = ExampleMiddleware<S>;
//!     type Future = Ready<Result<Self::Transform, Self::InitError>>;
//!
//!     fn new_transform(&self, service: S) -> Self::Future {
//!         ok(ExampleMiddleware {
//!             service: Rc::new(RefCell::new(service)),
//!             wrapper: Arc::clone(&self.0),
//!         })
//!     }
//! }
//! pub struct ExampleMiddleware<S> {
//!     service: Rc<RefCell<S>>,
//!     wrapper: Arc<FileBufferingStreamWrapper>,
//! }
//!
//! impl<S> Service for ExampleMiddleware<S>
//! where
//!     S: Service<Request = ServiceRequest, Response = ServiceResponse<Body>, Error = Error> + 'static,
//! {
//!     type Request = ServiceRequest;
//!     type Response = ServiceResponse<Body>;
//!     type Error = Error;
//!     type Future = Pin<Box<dyn Future<Output = Result<Self::Response, Self::Error>>>>;
//!
//!     fn poll_ready(&mut self, cx: &mut Context<'_>) -> Poll<Result<(), Self::Error>> {
//!         self.service.poll_ready(cx)
//!     }
//!
//!     fn call(&mut self, mut req: ServiceRequest) -> Self::Future {
//!         let mut svc = self.service.clone();
//!         let wrapper = self.wrapper.clone();
//!
//!         async move {
//!             enable_request_buffering(&wrapper, &mut req);
//!
//!             let mut stream = req.take_payload();
//!             let mut body = BytesMut::new();
//!             while let Some(chunk) = stream.next().await {
//!                 body.extend_from_slice(&chunk.unwrap());
//!             }
//!             req.set_payload(stream);
//!             println!("request body: {:?}", body);
//!
//!             let svc_res = svc.call(req).await?;
//!
//!             let mut svc_res = enable_response_buffering(&wrapper, svc_res);
//!
//!             let mut stream = svc_res.take_body();
//!             let mut body = BytesMut::new();
//!             while let Some(chunk) = stream.next().await {
//!                 body.extend_from_slice(&chunk.unwrap());
//!             }
//!             let svc_res = svc_res.map_body(|_, _| stream);
//!             println!("response body: {:?}", body);
//!
//!             Ok(svc_res)
//!         }
//!         .boxed_local()
//!     }
//! }
//! ```
pub mod buffering;

pub use crate::buffering::{
    enable_request_buffering, enable_response_buffering, FileBufferingStreamWrapper,
};