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use BindServer;
use futures::stream::Stream;
use futures::{Future, IntoFuture, Poll, Async};
use std::collections::VecDeque;
use std::io;
use streaming::{Message, Body};
use super::advanced::{Pipeline, PipelineMessage};
use super::{Frame, Transport};
use tokio_core::reactor::Handle;
use tokio_service::Service;
pub trait ServerProto<T: 'static>: 'static {
type Request: 'static;
type RequestBody: 'static;
type Response: 'static;
type ResponseBody: 'static;
type Error: From<io::Error> + 'static;
type Transport:
Transport<Item = Frame<Self::Request, Self::RequestBody, Self::Error>,
SinkItem = Frame<Self::Response, Self::ResponseBody, Self::Error>>;
type BindTransport: IntoFuture<Item = Self::Transport, Error = io::Error>;
fn bind_transport(&self, io: T) -> Self::BindTransport;
}
impl<P, T, B> BindServer<super::StreamingPipeline<B>, T> for P where
P: ServerProto<T>,
T: 'static,
B: Stream<Item = P::ResponseBody, Error = P::Error>,
{
type ServiceRequest = Message<P::Request, Body<P::RequestBody, P::Error>>;
type ServiceResponse = Message<P::Response, B>;
type ServiceError = P::Error;
fn bind_server<S>(&self, handle: &Handle, io: T, service: S)
where S: Service<Request = Self::ServiceRequest,
Response = Self::ServiceResponse,
Error = Self::ServiceError> + 'static
{
let task = self.bind_transport(io).into_future().and_then(|transport| {
let dispatch: Dispatch<S, T, P> = Dispatch {
service: service,
transport: transport,
in_flight: VecDeque::with_capacity(32),
};
Pipeline::new(dispatch)
});
handle.spawn(task.map_err(|_| ()))
}
}
struct Dispatch<S, T, P> where
T: 'static, P: ServerProto<T>, S: Service
{
service: S,
transport: P::Transport,
in_flight: VecDeque<InFlight<S::Future>>,
}
enum InFlight<F: Future> {
Active(F),
Done(Result<F::Item, F::Error>),
}
impl<P, T, B, S> super::advanced::Dispatch for Dispatch<S, T, P> where
P: ServerProto<T>,
T: 'static,
B: Stream<Item = P::ResponseBody, Error = P::Error>,
S: Service<Request = Message<P::Request, Body<P::RequestBody, P::Error>>,
Response = Message<P::Response, B>,
Error = P::Error>,
{
type Io = T;
type In = P::Response;
type BodyIn = P::ResponseBody;
type Out = P::Request;
type BodyOut = P::RequestBody;
type Error = P::Error;
type Stream = B;
type Transport = P::Transport;
fn transport(&mut self) -> &mut P::Transport {
&mut self.transport
}
fn dispatch(&mut self,
request: PipelineMessage<Self::Out, Body<Self::BodyOut, Self::Error>, Self::Error>)
-> io::Result<()>
{
if let Ok(request) = request {
let response = self.service.call(request);
self.in_flight.push_back(InFlight::Active(response));
}
Ok(())
}
fn poll(&mut self) -> Poll<Option<PipelineMessage<Self::In, Self::Stream, Self::Error>>, io::Error> {
for slot in self.in_flight.iter_mut() {
slot.poll();
}
match self.in_flight.front() {
Some(&InFlight::Done(_)) => {}
_ => return Ok(Async::NotReady)
}
match self.in_flight.pop_front() {
Some(InFlight::Done(res)) => Ok(Async::Ready(Some(res))),
_ => panic!(),
}
}
fn has_in_flight(&self) -> bool {
!self.in_flight.is_empty()
}
}
impl<F: Future> InFlight<F> {
fn poll(&mut self) {
let res = match *self {
InFlight::Active(ref mut f) => {
match f.poll() {
Ok(Async::Ready(e)) => Ok(e),
Err(e) => Err(e),
Ok(Async::NotReady) => return,
}
}
_ => return,
};
*self = InFlight::Done(res);
}
}