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mirror of https://github.com/actix/actix-extras.git synced 2024-11-25 00:12:59 +01:00
actix-extras/src/handler.rs
2019-03-05 10:08:08 -08:00

387 lines
9.4 KiB
Rust

use std::cell::RefCell;
use std::marker::PhantomData;
use std::rc::Rc;
use actix_http::{Error, Extensions, Response};
use actix_service::{NewService, Service, Void};
use futures::future::{ok, FutureResult};
use futures::{try_ready, Async, Future, IntoFuture, Poll};
use crate::extract::FromRequest;
use crate::request::HttpRequest;
use crate::responder::Responder;
use crate::service::{ServiceFromRequest, ServiceRequest, ServiceResponse};
/// Handler converter factory
pub trait Factory<T, R>: Clone
where
R: Responder,
{
fn call(&self, param: T) -> R;
}
impl<F, R> Factory<(), R> for F
where
F: Fn() -> R + Clone + 'static,
R: Responder + 'static,
{
fn call(&self, _: ()) -> R {
(self)()
}
}
#[doc(hidden)]
pub struct Handle<F, T, R>
where
F: Factory<T, R>,
R: Responder,
{
hnd: F,
_t: PhantomData<(T, R)>,
}
impl<F, T, R> Handle<F, T, R>
where
F: Factory<T, R>,
R: Responder,
{
pub fn new(hnd: F) -> Self {
Handle {
hnd,
_t: PhantomData,
}
}
}
impl<F, T, R> NewService<(T, HttpRequest)> for Handle<F, T, R>
where
F: Factory<T, R>,
R: Responder + 'static,
{
type Response = ServiceResponse;
type Error = Void;
type InitError = ();
type Service = HandleService<F, T, R>;
type Future = FutureResult<Self::Service, ()>;
fn new_service(&self, _: &()) -> Self::Future {
ok(HandleService {
hnd: self.hnd.clone(),
_t: PhantomData,
})
}
}
#[doc(hidden)]
pub struct HandleService<F, T, R>
where
F: Factory<T, R>,
R: Responder + 'static,
{
hnd: F,
_t: PhantomData<(T, R)>,
}
impl<F, T, R> Service<(T, HttpRequest)> for HandleService<F, T, R>
where
F: Factory<T, R>,
R: Responder + 'static,
{
type Response = ServiceResponse;
type Error = Void;
type Future = HandleServiceResponse<<R::Future as IntoFuture>::Future>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, (param, req): (T, HttpRequest)) -> Self::Future {
let fut = self.hnd.call(param).respond_to(&req).into_future();
HandleServiceResponse {
fut,
req: Some(req),
}
}
}
pub struct HandleServiceResponse<T> {
fut: T,
req: Option<HttpRequest>,
}
impl<T> Future for HandleServiceResponse<T>
where
T: Future<Item = Response>,
T::Error: Into<Error>,
{
type Item = ServiceResponse;
type Error = Void;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
match self.fut.poll() {
Ok(Async::Ready(res)) => Ok(Async::Ready(ServiceResponse::new(
self.req.take().unwrap(),
res,
))),
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(e) => {
let res: Response = e.into().into();
Ok(Async::Ready(ServiceResponse::new(
self.req.take().unwrap(),
res,
)))
}
}
}
}
/// Async handler converter factory
pub trait AsyncFactory<T, R>: Clone + 'static
where
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
fn call(&self, param: T) -> R;
}
impl<F, R> AsyncFactory<(), R> for F
where
F: Fn() -> R + Clone + 'static,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
fn call(&self, _: ()) -> R {
(self)()
}
}
#[doc(hidden)]
pub struct AsyncHandle<F, T, R>
where
F: AsyncFactory<T, R>,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
hnd: F,
_t: PhantomData<(T, R)>,
}
impl<F, T, R> AsyncHandle<F, T, R>
where
F: AsyncFactory<T, R>,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
pub fn new(hnd: F) -> Self {
AsyncHandle {
hnd,
_t: PhantomData,
}
}
}
impl<F, T, R> NewService<(T, HttpRequest)> for AsyncHandle<F, T, R>
where
F: AsyncFactory<T, R>,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
type Response = ServiceResponse;
type Error = ();
type InitError = ();
type Service = AsyncHandleService<F, T, R>;
type Future = FutureResult<Self::Service, ()>;
fn new_service(&self, _: &()) -> Self::Future {
ok(AsyncHandleService {
hnd: self.hnd.clone(),
_t: PhantomData,
})
}
}
#[doc(hidden)]
pub struct AsyncHandleService<F, T, R>
where
F: AsyncFactory<T, R>,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
hnd: F,
_t: PhantomData<(T, R)>,
}
impl<F, T, R> Service<(T, HttpRequest)> for AsyncHandleService<F, T, R>
where
F: AsyncFactory<T, R>,
R: IntoFuture,
R::Item: Into<Response>,
R::Error: Into<Error>,
{
type Response = ServiceResponse;
type Error = ();
type Future = AsyncHandleServiceResponse<R::Future>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, (param, req): (T, HttpRequest)) -> Self::Future {
AsyncHandleServiceResponse {
fut: self.hnd.call(param).into_future(),
req: Some(req),
}
}
}
#[doc(hidden)]
pub struct AsyncHandleServiceResponse<T> {
fut: T,
req: Option<HttpRequest>,
}
impl<T> Future for AsyncHandleServiceResponse<T>
where
T: Future,
T::Item: Into<Response>,
T::Error: Into<Error>,
{
type Item = ServiceResponse;
type Error = ();
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
match self.fut.poll() {
Ok(Async::Ready(res)) => Ok(Async::Ready(ServiceResponse::new(
self.req.take().unwrap(),
res.into(),
))),
Ok(Async::NotReady) => Ok(Async::NotReady),
Err(e) => {
let res: Response = e.into().into();
Ok(Async::Ready(ServiceResponse::new(
self.req.take().unwrap(),
res,
)))
}
}
}
}
/// Extract arguments from request
pub struct Extract<P, T: FromRequest<P>> {
config: Rc<RefCell<Option<Rc<Extensions>>>>,
_t: PhantomData<(P, T)>,
}
impl<P, T: FromRequest<P>> Extract<P, T> {
pub fn new(config: Rc<RefCell<Option<Rc<Extensions>>>>) -> Self {
Extract {
config,
_t: PhantomData,
}
}
}
impl<P, T: FromRequest<P>> NewService<ServiceRequest<P>> for Extract<P, T> {
type Response = (T, HttpRequest);
type Error = (Error, ServiceFromRequest<P>);
type InitError = ();
type Service = ExtractService<P, T>;
type Future = FutureResult<Self::Service, ()>;
fn new_service(&self, _: &()) -> Self::Future {
ok(ExtractService {
_t: PhantomData,
config: self.config.borrow().clone(),
})
}
}
pub struct ExtractService<P, T: FromRequest<P>> {
config: Option<Rc<Extensions>>,
_t: PhantomData<(P, T)>,
}
impl<P, T: FromRequest<P>> Service<ServiceRequest<P>> for ExtractService<P, T> {
type Response = (T, HttpRequest);
type Error = (Error, ServiceFromRequest<P>);
type Future = ExtractResponse<P, T>;
fn poll_ready(&mut self) -> Poll<(), Self::Error> {
Ok(Async::Ready(()))
}
fn call(&mut self, req: ServiceRequest<P>) -> Self::Future {
let mut req = ServiceFromRequest::new(req, self.config.clone());
ExtractResponse {
fut: T::from_request(&mut req).into_future(),
req: Some(req),
}
}
}
pub struct ExtractResponse<P, T: FromRequest<P>> {
req: Option<ServiceFromRequest<P>>,
fut: <T::Future as IntoFuture>::Future,
}
impl<P, T: FromRequest<P>> Future for ExtractResponse<P, T> {
type Item = (T, HttpRequest);
type Error = (Error, ServiceFromRequest<P>);
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let item = try_ready!(self
.fut
.poll()
.map_err(|e| (e.into(), self.req.take().unwrap())));
let req = self.req.take().unwrap();
let req = req.into_request();
Ok(Async::Ready((item, req)))
}
}
/// FromRequest trait impl for tuples
macro_rules! factory_tuple ({ $(($n:tt, $T:ident)),+} => {
impl<Func, $($T,)+ Res> Factory<($($T,)+), Res> for Func
where Func: Fn($($T,)+) -> Res + Clone + 'static,
Res: Responder + 'static,
{
fn call(&self, param: ($($T,)+)) -> Res {
(self)($(param.$n,)+)
}
}
impl<Func, $($T,)+ Res> AsyncFactory<($($T,)+), Res> for Func
where Func: Fn($($T,)+) -> Res + Clone + 'static,
Res: IntoFuture + 'static,
Res::Item: Into<Response>,
Res::Error: Into<Error>,
{
fn call(&self, param: ($($T,)+)) -> Res {
(self)($(param.$n,)+)
}
}
});
#[rustfmt::skip]
mod m {
use super::*;
factory_tuple!((0, A));
factory_tuple!((0, A), (1, B));
factory_tuple!((0, A), (1, B), (2, C));
factory_tuple!((0, A), (1, B), (2, C), (3, D));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E), (5, F));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E), (5, F), (6, G));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E), (5, F), (6, G), (7, H));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E), (5, F), (6, G), (7, H), (8, I));
factory_tuple!((0, A), (1, B), (2, C), (3, D), (4, E), (5, F), (6, G), (7, H), (8, I), (9, J));
}