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use bytes::Bytes;
use futures::{self, Async, Future};
use http::{Request, Response, StatusCode};
use hyper::body::Body;
use hyper::service::{NewService, Service};
use std::sync::Arc;
use std::{fmt, mem};
use context::{Context, ContextParts};
use error::{CritError, Error};
use future::{self as future_compat, Poll};
use input::RequestBody;
use output::{Output, ResponseBody};
use server::{Io, ServiceUpgradeExt};
use upgrade::service as upgrade;
use super::{App, AppState};
impl App {
pub fn new_service(&self) -> AppService {
AppService {
state: self.state.clone(),
rx: upgrade::new(),
}
}
}
impl NewService for App {
type ReqBody = Body;
type ResBody = Body;
type Error = CritError;
type Service = AppService;
type InitError = CritError;
type Future = futures::future::FutureResult<Self::Service, Self::InitError>;
fn new_service(&self) -> Self::Future {
futures::future::ok(self.new_service())
}
}
#[derive(Debug)]
pub struct AppService {
state: Arc<AppState>,
rx: upgrade::Receiver,
}
impl Service for AppService {
type ReqBody = Body;
type ResBody = Body;
type Error = CritError;
type Future = AppServiceFuture;
fn call(&mut self, request: Request<Self::ReqBody>) -> Self::Future {
AppServiceFuture {
kind: AppServiceFutureKind::Initial(request.map(RequestBody::from_hyp)),
state: self.state.clone(),
tx: self.rx.sender(),
}
}
}
impl ServiceUpgradeExt<Io> for AppService {
type Upgrade = AppServiceUpgrade;
type UpgradeError = CritError;
fn poll_ready_upgradable(&mut self) -> futures::Poll<(), Self::UpgradeError> {
self.rx.poll_ready()
}
fn upgrade(self, io: Io, read_buf: Bytes) -> Self::Upgrade {
AppServiceUpgrade {
inner: self.rx.try_upgrade(io, read_buf),
}
}
}
#[must_use = "futures do nothing unless polled"]
#[derive(Debug)]
pub struct AppServiceFuture {
kind: AppServiceFutureKind,
state: Arc<AppState>,
tx: upgrade::Sender,
}
enum AppServiceFutureKind {
Initial(Request<RequestBody>),
InFlight(
Context,
Box<future_compat::Future<Output = Result<Output, Error>> + Send>,
),
Done,
}
impl fmt::Debug for AppServiceFutureKind {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
match *self {
AppServiceFutureKind::Initial(ref req) => f.debug_tuple("Initial").field(req).finish(),
AppServiceFutureKind::InFlight(..) => f.debug_struct("InFlight").finish(),
AppServiceFutureKind::Done => f.debug_struct("Done").finish(),
}
}
}
impl futures::Future for AppServiceFuture {
type Item = Response<Body>;
type Error = CritError;
fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
match self.poll_in_flight() {
Poll::Pending => Ok(futures::Async::NotReady),
Poll::Ready(Ok((out, cx))) => self.handle_response(out, cx).map(Async::Ready),
Poll::Ready(Err((err, request))) => self.handle_error(err, request).map(Async::Ready),
}
}
}
impl AppServiceFuture {
fn poll_in_flight(&mut self) -> future_compat::Poll<Result<(Output, ContextParts), (Error, Request<()>)>> {
use self::AppServiceFutureKind::*;
loop {
let in_flight_result = match self.kind {
Initial(..) => None,
InFlight(ref cx, ref mut f) => Some(ready!(self.state.set(|| cx.set(|| f.poll())))),
_ => panic!("unexpected state"),
};
match (mem::replace(&mut self.kind, Done), in_flight_result) {
(Initial(request), None) => {
let (i, params) = match self.state.router().recognize(request.uri().path(), request.method()) {
Ok(v) => v,
Err(e) => return Poll::Ready(Err((e, request.map(mem::drop)))),
};
let route = &self.state.router().get_route(i).unwrap();
let cx = Context::new(request, i, params);
let in_flight = self.state.set(|| route.handle(&cx));
self.kind = InFlight(cx, in_flight);
}
(InFlight(cx, _), Some(result)) => {
return Poll::Ready(match result {
Ok(out) => Ok((out, cx.into_parts())),
Err(err) => Err((err, cx.into_parts().request.map(mem::drop))),
})
}
_ => panic!("unexpected state"),
}
}
}
fn handle_response(&mut self, output: Output, cx: ContextParts) -> Result<Response<Body>, CritError> {
let (mut response, handler) = output.deconstruct();
cx.cookies.append_to(response.headers_mut());
if let Some(handler) = handler {
debug_assert_eq!(response.status(), StatusCode::SWITCHING_PROTOCOLS);
self.tx.send(handler, cx.request.map(mem::drop));
}
Ok(response)
}
fn handle_error(&mut self, err: Error, request: Request<()>) -> Result<Response<Body>, CritError> {
if let Some(err) = err.as_http_error() {
let response = self.state.error_handler().handle_error(err, &request)?;
return Ok(response.map(ResponseBody::into_hyp));
}
Err(err.into_critical()
.expect("unexpected condition in AppServiceFuture::handle_error"))
}
}
#[must_use = "futures do nothing unless polled"]
pub struct AppServiceUpgrade {
inner: Result<Box<Future<Item = (), Error = ()> + Send>, Io>,
}
impl fmt::Debug for AppServiceUpgrade {
fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
f.debug_struct("AppServiceUpgrade").finish()
}
}
impl futures::Future for AppServiceUpgrade {
type Item = ();
type Error = ();
fn poll(&mut self) -> futures::Poll<Self::Item, Self::Error> {
match self.inner {
Ok(ref mut f) => f.poll(),
Err(ref mut io) => io.shutdown().map_err(mem::drop),
}
}
}