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use std::io;
use std::net::SocketAddr;
use std::sync::Arc;
use std::thread;
use futures::{Future, Poll, Stream};
use hyper;
use hyper::server::Http;
use net2::TcpBuilder;
use tokio_core::net::TcpListener;
use tokio_core::reactor::{Core, Handle};
use tokio_service::Service;
use context::{Context, RequestInfo};
use endpoint::{Endpoint, EndpointError, EndpointResult, NewEndpoint};
use request;
use response::Responder;
#[derive(Debug, Clone)]
pub struct EndpointService<E> {
endpoint: E,
handle: Handle,
}
impl<E> Service for EndpointService<E>
where
E: NewEndpoint,
E::Item: Responder,
E::Error: Responder,
{
type Request = hyper::Request;
type Response = hyper::Response;
type Error = hyper::Error;
type Future = EndpointFuture<E::Future>;
fn call(&self, req: hyper::Request) -> Self::Future {
let (req, body) = request::reconstruct(req);
let info = RequestInfo::new(&req, body);
let inner = self.apply_endpoint(&info);
EndpointFuture {
inner: inner.map_err(Some),
}
}
}
impl<E> EndpointService<E>
where
E: NewEndpoint,
E::Item: Responder,
E::Error: Responder,
{
fn apply_endpoint(&self, req: &RequestInfo) -> EndpointResult<E::Future> {
let mut ctx = Context::from(req);
let endpoint = self.endpoint.new_endpoint(&self.handle);
let mut result = endpoint.apply(&mut ctx);
if ctx.next_segment().is_some() {
result = Err(EndpointError::Skipped);
}
result
}
}
#[derive(Debug)]
pub struct EndpointFuture<F> {
inner: Result<F, Option<EndpointError>>,
}
impl<F> Future for EndpointFuture<F>
where
F: Future,
F::Item: Responder,
F::Error: Responder,
{
type Item = hyper::Response;
type Error = hyper::Error;
fn poll(&mut self) -> Poll<Self::Item, Self::Error> {
let inner = match self.inner.as_mut() {
Ok(inner) => inner,
Err(err) => {
let err = err.take().expect("cannot reject twice");
return Ok(err.into_response().into());
}
};
let item = inner.poll();
let item = item.map(|item| item.map(Responder::into_response))
.map_err(Responder::into_response);
Ok(item.unwrap_or_else(Into::into))
}
}
#[derive(Debug)]
pub struct Server<E> {
endpoint: E,
addr: Option<&'static str>,
num_workers: Option<usize>,
}
impl<E: NewEndpoint> Server<E> {
pub fn new(endpoint: E) -> Self {
Self {
endpoint,
addr: None,
num_workers: None,
}
}
pub fn bind(mut self, addr: &'static str) -> Self {
self.addr = Some(addr);
self
}
pub fn num_workers(mut self, n: usize) -> Self {
self.num_workers = Some(n);
self
}
}
impl<E> Server<E>
where
E: NewEndpoint + Send + Sync + 'static,
E::Item: Responder,
E::Error: Responder,
{
pub fn run_http(self) {
let endpoint = Arc::new(self.endpoint);
let addr = self.addr.unwrap_or("0.0.0.0:4000").parse().unwrap();
let num_workers = self.num_workers.unwrap_or(1);
for _ in 0..(num_workers - 1) {
let endpoint = endpoint.clone();
thread::spawn(move || { serve(endpoint, num_workers, &addr); });
}
serve(endpoint.clone(), num_workers, &addr);
}
}
fn serve<E>(endpoint: E, num_workers: usize, addr: &SocketAddr)
where
E: NewEndpoint + Clone + 'static,
E::Item: Responder,
E::Error: Responder,
{
let mut core = Core::new().unwrap();
let handle = core.handle();
let proto = Http::new();
let listener = listener(&addr, num_workers, &handle).unwrap();
let server = listener.incoming().for_each(|(sock, addr)| {
proto.bind_connection(
&handle,
sock,
addr,
EndpointService {
endpoint: endpoint.clone(),
handle: handle.clone(),
},
);
Ok(())
});
core.run(server).unwrap()
}
fn listener(addr: &SocketAddr, num_workers: usize, handle: &Handle) -> io::Result<TcpListener> {
let listener = match *addr {
SocketAddr::V4(_) => TcpBuilder::new_v4()?,
SocketAddr::V6(_) => TcpBuilder::new_v6()?,
};
configure_tcp(&listener, num_workers)?;
listener.reuse_address(true)?;
listener.bind(addr)?;
let l = listener.listen(1024)?;
TcpListener::from_listener(l, addr, handle)
}
#[cfg(not(windows))]
fn configure_tcp(tcp: &TcpBuilder, workers: usize) -> io::Result<()> {
use net2::unix::UnixTcpBuilderExt;
if workers > 1 {
tcp.reuse_port(true)?;
}
Ok(())
}
#[cfg(windows)]
fn configure_tcp(_: &TcpBuilder, _: usize) -> io::Result<()> {
Ok(())
}