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main.rs
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main.rs
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use std::sync::{Arc, Mutex};
use std::collections::HashMap;
use hyper::{Body, Response, Server, Request, Method, Chunk};
use hyper::rt::Future;
use hyper::service::{service_fn};
use futures::sync::oneshot;
use structopt::StructOpt;
use futures::Async;
/// Piping Server in Rust
#[derive(StructOpt, Debug)]
#[structopt(name = "piping-server")]
#[structopt(rename_all = "kebab-case")]
struct Opt {
/// HTTP port
#[structopt(long, default_value = "8080")]
http_port: u16,
}
struct ReqRes {
req: Request<Body>,
res_sender: oneshot::Sender<Response<Body>>,
}
// NOTE: oneshot::Receiver can be Future
fn req_res_handler<F>(mut handler: F) -> impl FnMut(Request<Body>) -> oneshot::Receiver<Response<Body>> where
F: FnMut(Request<Body>, oneshot::Sender<Response<Body>>) -> ()
{
move |req| {
let (res_sender, res_receiver) = oneshot::channel::<Response<Body>>();
handler(req, res_sender);
res_receiver
}
}
struct FinishDetectableBody {
body: Body,
finish_notifier: Option<oneshot::Sender<()>>,
}
impl futures::stream::Stream for FinishDetectableBody {
type Item = Chunk;
type Error = hyper::Error;
fn poll(&mut self) -> Result<Async<Option<Self::Item>>, Self::Error> {
match self.body.poll() {
// If body is finished
Ok(Async::Ready(None)) => {
// Notify finish
if let Some(notifier) = self.finish_notifier.take() {
notifier.send(()).unwrap();
}
Ok(Async::Ready(None))
},
r@ _ => r
}
}
}
impl FinishDetectableBody {
fn new(body: Body, finish_notifier: oneshot::Sender<()>) -> FinishDetectableBody {
FinishDetectableBody {
body,
finish_notifier: Some(finish_notifier)
}
}
}
fn transfer(path: String, sender_req_res: ReqRes, receiver_req_res: ReqRes) {
println!("Transfer start: '{}'", path);
// For streaming sender's response body
let (mut sender_res_body_sender, sender_res_body) = Body::channel();
// For notifying and waiting for sender's request body
let (sender_req_body_finish_notifier, sender_req_body_finish_waiter) = oneshot::channel::<()>();
// Notify sender when sending starts
sender_res_body_sender.send_data(Chunk::from("[INFO] Start sending...\n")).unwrap();
// Create receiver's body
let receiver_res_body = Body::wrap_stream(FinishDetectableBody::new(
sender_req_res.req.into_body(),
sender_req_body_finish_notifier
));
// Return response to receiver
receiver_req_res.res_sender.send(Response::new( receiver_res_body )).unwrap();
// Return response to sender
sender_req_res.res_sender.send(Response::new(sender_res_body)).unwrap();
// Wait for sender's request body finished
hyper::rt::spawn(sender_req_body_finish_waiter.then(move |_| {
// Notify sender when sending finished
sender_res_body_sender.send_data(Chunk::from("[INFO] Sent successfully!\n")).unwrap();
println!("Transfer end: '{}'", path);
Ok(())
}));
}
// TODO: Use some logger instead of print!()s
fn main() {
// Parse options
let opt = Opt::from_args();
let port = opt.http_port;
let addr = ([0, 0, 0, 0], port).into();
let path_to_sender: Arc<Mutex<HashMap<String, ReqRes>>> = Arc::new(Mutex::new(HashMap::new()));
let path_to_receiver: Arc<Mutex<HashMap<String, ReqRes>>> = Arc::new(Mutex::new(HashMap::new()));
let svc = move || {
let path_to_sender = Arc::clone(&path_to_sender);
let path_to_receiver = Arc::clone(&path_to_receiver);
let handler = req_res_handler(move |req, res_sender| {
let mut path_to_sender_guard = path_to_sender.lock().unwrap();
let mut path_to_receiver_guard = path_to_receiver.lock().unwrap();
let path = req.uri().path();
println!("{} {}", req.method(), req.uri().path());
match req.method() {
&Method::GET => {
// If a receiver has been connected already
if path_to_receiver_guard.contains_key(path) {
let res = Response::builder()
.status(400)
.body(Body::from(format!("[ERROR] Another receiver has been connected on '{}'.\n", path)))
.unwrap();
res_sender.send(res).unwrap();
return;
}
match path_to_sender_guard.remove(path) {
// If sender is found
Some(sender_req_res) => {
transfer(path.to_string(), sender_req_res, ReqRes{req, res_sender});
},
// If sender is not found
None => {
path_to_receiver_guard.insert(path.to_string(), ReqRes {
req,
res_sender,
});
}
}
},
&Method::POST | &Method::PUT => {
// If a sender has been connected already
if path_to_sender_guard.contains_key(path) {
let res = Response::builder()
.status(400)
.body(Body::from(format!("[ERROR] Another sender has been connected on '{}'.\n", path)))
.unwrap();
res_sender.send(res).unwrap();
return;
}
match path_to_receiver_guard.remove(path) {
// If receiver is found
Some(receiver_req_res) => {
transfer(path.to_string(),ReqRes{req, res_sender}, receiver_req_res);
},
// If receiver is not found
None => {
path_to_sender_guard.insert(path.to_string(), ReqRes{req, res_sender});
}
}
},
_ => {
println!("Unsupported method: {}", req.method());
let res = Response::builder()
.status(400)
.body(Body::from(format!("[ERROR] Unsupported method: {}.\n", req.method())))
.unwrap();
res_sender.send(res).unwrap();
}
}
});
service_fn(handler)
};
let server = Server::bind(&addr)
.serve(svc)
.map_err(|e| eprintln!("server error: {}", e));
println!("server is running on {}...", port);
hyper::rt::run(server);
}