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#[macro_use]
extern crate bitflags;
extern crate bytes;
#[macro_use]
extern crate error_chain;
#[macro_use]
extern crate futures;
extern crate hyper;
#[macro_use]
extern crate log;
extern crate http;
extern crate tokio;
extern crate tokio_timer;
use std::time::*;
use bytes::*;
use futures::future::*;
use futures::stream::*;
use futures::sync::mpsc;
use futures::*;
use futures::{Future, Sink, Stream};
use hyper::header::*;
use hyper::service::Service;
use hyper::{Body, Chunk, Method, Request, Response, StatusCode};
const FLUSH_DEADLINE_MS: u64 = 200;
mod parse;
mod raw;
pub use raw::*;
mod sse;
pub use sse::*;
mod client;
pub use client::*;
pub mod error {
use super::*;
error_chain! {
foreign_links {
Hyper(hyper::Error);
Http(http::Error);
}
errors {
InvalidUTF8(e: std::str::Utf8Error) {
description("invalid UTF8")
}
Protocol(e: parse::ParseError) {
description("protocol")
}
}
}
}
#[derive(Debug)]
struct RecvError;
impl std::fmt::Display for RecvError {
fn fmt(&self, fmt: &mut std::fmt::Formatter) -> std::fmt::Result {
write!(fmt, "recv error")
}
}
impl std::error::Error for RecvError {}
type HttpSender = mpsc::Sender<Chunk>;
pub static LAST_EVENT_ID: &[u8] = b"last-event-id";
fn get_event_id(req: &Request<Body>) -> Option<usize> {
let name = HeaderName::from_lowercase(LAST_EVENT_ID).ok()?;
let last_event_id = req.headers().get(name)?;
let last_event_id = std::str::from_utf8(last_event_id.as_bytes()).ok()?;
let event_id = last_event_id.parse::<usize>().ok()?;
Some(event_id)
}
#[derive(Debug)]
pub struct Client {
req: Request<Body>,
sender: HttpSender,
seq: usize,
}
impl Client {
pub fn new(req: Request<Body>, sender: HttpSender) -> Self {
let mut seq = 0;
if let Some(event_id) = get_event_id(&req) {
seq = event_id + 1;
}
Self { req, sender, seq }
}
}
fn hyper_resp_err() -> Response<Body> {
Response::builder()
.status(StatusCode::SERVICE_UNAVAILABLE)
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.body(Body::empty())
.unwrap_or_else(|_| Response::new(Body::empty()))
}
#[derive(Clone)]
pub struct EchoService {
sender: mpsc::Sender<BroadcastRawEvent>,
inner: EventService,
}
impl EchoService {
pub fn new() -> Self {
let (inner, sender) = EventService::pair_raw();
Self { sender, inner }
}
}
impl Service for EchoService {
type ReqBody = Body;
type ResBody = Body;
type Error = hyper::Error;
type Future = Box<Future<Item = Response<Body>, Error = Self::Error>>;
fn call(&mut self, req: Request<Self::ReqBody>) -> Self::Future {
let method = req.method().clone();
match method {
Method::GET => {
return self.inner.call(req);
}
Method::POST => {
let body = req.into_body();
let sender = self.sender.clone();
let f =
body.map_err(|_e| {
error!("failed to read body: {:?}", _e);
}).fold(sender, |sender, chunk| {
let bytes: Bytes = chunk.to_vec().into();
sender
.send(BroadcastRawEvent::Message(bytes))
.map_err(|_e| {
error!("failed to send: {:?}", _e);
})
})
.map_err(|_e| {
error!("failed to send body: {:?}", _e);
})
.then(|_| Ok(hyper_resp_err()));
Box::new(f)
}
_ => Box::new(ok(hyper_resp_err())),
}
}
}
#[derive(Clone)]
pub struct EventService {
sender: mpsc::Sender<(Request<Body>, HttpSender)>,
}
impl EventService {
pub fn pair() -> (Self, mpsc::Receiver<(Request<Body>, HttpSender)>) {
let (sender, receiver) = mpsc::channel(10);
let serv = Self { sender };
(serv, receiver)
}
pub fn pair_raw() -> (Self, mpsc::Sender<BroadcastRawEvent>) {
let (serv, conn_receiver) = EventService::pair();
let (sender, receiver) = mpsc::channel(10);
let stream_rx = conn_receiver
.map(|(req, conn)| {
BroadcastRawEvent::NewClient(Client::new(req, conn))
})
.map_err(|_e| {
error!("error on accepting connections: {:?}", _e);
()
});
let broadcast = BroadcastRaw::new();
let broker = receiver
.select(stream_rx)
.fold(broadcast, BroadcastRaw::on_event)
.map(|_b| ());
tokio::spawn(broker);
(serv, sender)
}
pub fn pair_sse(opt: BroadcastFlags) -> (Self, mpsc::Sender<BroadcastEvent>) {
let (serv, conn_receiver) = EventService::pair();
let (sender, receiver) = mpsc::channel(10);
let stream_rx = conn_receiver
.map(|(req, conn)| {
BroadcastEvent::NewClient(Client::new(req, conn))
})
.map_err(|_e| {
error!("error on accepting connections: {:?}", _e);
()
});
let broadcast = Broadcast::new(opt);
let broker = receiver
.select(stream_rx)
.fold(broadcast, Broadcast::on_event)
.map(|_b| ());
tokio::spawn(broker);
(serv, sender)
}
}
impl Service for EventService {
type ReqBody = Body;
type ResBody = Body;
type Error = hyper::Error;
type Future = Box<Future<Item = Response<Body>, Error = Self::Error> + Send>;
fn call(&mut self, req: Request<Body>) -> Self::Future {
let (sender, receiver) = mpsc::channel(16);
let receiver: Box<Stream<Item = _, Error = _> + Send + 'static> =
Box::new(receiver.map_err(|_e| {
let e: Box<std::error::Error + Send + Sync> = Box::new(RecvError);
e
}));
let body = Body::from(receiver);
let msg = (req, sender);
let f = self.sender.clone().send(msg).then(|res| match res {
Ok(_) => Ok(Response::builder()
.status(hyper::StatusCode::OK)
.header(ACCESS_CONTROL_ALLOW_ORIGIN, "*")
.header(CONTENT_TYPE, "text/event-stream")
.body(body)
.unwrap_or_else(|_| Response::new(Body::empty()))),
Err(_e) => {
Ok(hyper_resp_err())
}
});
Box::new(f)
}
}