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sample_server.rs
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sample_server.rs
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// pub mod asynchronous;
// // Must come before modules using the macros!
// mod macros;
// mod client;
// mod destinations;
// mod error;
// mod frame_handler;
use little_stomper::asynchronous::client::ClientSession;
use little_stomper::asynchronous::destinations::{AsyncDestinations, DestinationType};
use little_stomper::asynchronous::inmemory::InMemDestination;
use little_stomper::client::{DefaultClient, DefaultClientFactory};
use little_stomper::destinations::Destinations;
use little_stomper::error::StomperError;
use sender_sink::wrappers::UnboundedSenderSink;
// use futures_util::StreamExt;
use futures::future::{FutureExt, TryFutureExt};
use futures::sink::SinkExt;
use futures::stream::{StreamExt, TryStreamExt};
use std::future::ready;
use log::info;
use std::future::Future;
use std::sync::Arc;
use std::{env, io::Error};
use tokio_stream::wrappers::UnboundedReceiverStream;
use tokio::net::{TcpListener, TcpStream};
use tokio::sync::mpsc::{self, UnboundedSender};
use tokio_tungstenite::{tungstenite::Message, WebSocketStream};
struct WebSocketMessageHandler {
// where to call back to
message_channel: UnboundedSender<Message>,
}
impl WebSocketMessageHandler {
pub fn new(message_channel: UnboundedSender<Message>) -> WebSocketMessageHandler {
WebSocketMessageHandler { message_channel }
}
pub fn into_filter_map(
self,
) -> impl Fn(Message) -> std::future::Ready<Result<Option<Vec<u8>>, StomperError>> {
move |msg| ready(self.handle_message(msg))
}
fn handle_message(&self, msg: Message) -> Result<Option<Vec<u8>>, StomperError> {
Ok(match msg {
Message::Ping(bytes) => {
self.message_channel
.send(Message::Pong(bytes))
.map_err(|_| StomperError {
message: "Unable to send return message".to_owned(),
})?;
None
}
Message::Pong(_) => {
// Not sure what to do, ignore for now
None
}
Message::Close(_) => {
info!("Client connection dropped");
// Need to shut the whole shebang down - we'll forward the message to achieve that
if self.message_channel.send(msg).is_err() {
info!("Trying to close channel; alread closed");
};
return Err(StomperError {
message: "WebSocketChannel closed".to_owned(),
});
}
Message::Text(text) => Some(text.into_bytes()),
Message::Binary(bytes) => Some(bytes),
Message::Frame(_) => {
// Not sure what to do, ignore for now
None
}
})
}
}
pub fn handle_websocket<T: Destinations<Client = DefaultClient> + 'static>(
websocket: WebSocketStream<tokio::net::TcpStream>,
destinations: T,
) -> impl Future<Output = Result<(), StomperError>> + Send {
let (socket_tx, ws_stream) = websocket.split();
let (ws_tx, ws_rx) = mpsc::unbounded_channel();
let pong_channel = ws_tx.clone();
//let ping_channel = ws_tx.clone();
//ping_channel.send(Message::Ping(vec![])).unwrap();
// tokio::spawn(async move {
// let mut interval = time::interval(Duration::from_secs(1));
// loop {
// interval.tick().await;
// if let Err(e) = ping_channel.send(Message::Ping(vec![])) {
// info!("Error sending ping: {}", e);
// }
// }
// });
let ws_response_processor_handle = tokio::task::spawn(async move {
UnboundedReceiverStream::new(ws_rx)
// Stop when a close message is received
.take_while(|msg: &Message| ready(!msg.is_close()))
.map(Ok)
.forward(socket_tx)
.unwrap_or_else(|err| {
info!("Error: {}", err);
})
.await;
});
// Transform the stream of websocket messages into a stream of byte arrays for the Stomp part;
// handle non-Stomp message types along the way
let bytes_stream = ws_stream
.map_err(|err| StomperError {
message: format!("Websocket error: {}", err.to_string()),
})
.inspect_err(|err| log::error!("Error: {:?}", err))
.try_filter_map(WebSocketMessageHandler::new(pong_channel).into_filter_map())
.boxed();
let sink = UnboundedSenderSink::from(ws_tx)
.with(|bytes: Vec<u8>| ready(Ok(Message::text(String::from_utf8(bytes).unwrap()))));
ClientSession::process_stream(
bytes_stream,
Box::pin(sink),
destinations,
DefaultClientFactory {},
)
.then(move |_| async {
ws_response_processor_handle
.await
.map_err(|_| StomperError {
message: "Error awaiting WebSocket response handler".to_owned(),
})
})
}
#[tokio::main]
async fn main() -> Result<(), Error> {
let _ = env_logger::try_init();
let addr = env::args()
.nth(1)
.unwrap_or_else(|| "127.0.0.1:3030".to_string());
// Create the event loop and TCP listener we'll accept connections on.
let try_socket = TcpListener::bind(&addr).await;
let listener = try_socket.expect("Failed to bind");
info!("Listening on: {}", addr);
let destinations =
AsyncDestinations::<InMemDestination>::start(Arc::new(InMemDestination::create)).await;
while let Ok((stream, _)) = listener.accept().await {
tokio::spawn(accept_connection(stream, destinations.clone()));
}
Ok(())
}
async fn accept_connection<D: DestinationType + 'static>(
stream: TcpStream,
destinations: AsyncDestinations<D>,
) {
let addr = stream
.peer_addr()
.expect("connected streams should have a peer address");
info!("Peer address: {}", addr);
let ws_stream = tokio_tungstenite::accept_async(stream)
.await
.expect("Error during the websocket handshake occurred");
info!("New WebSocket connection: {}", addr);
if let Err(err) = handle_websocket(ws_stream, destinations).await {
log::error!("Error handling websocket: {}", err);
}
info!(" Connection Ended: {}", addr);
}
#[cfg(test)]
mod test {
use super::WebSocketMessageHandler;
use tokio::sync::mpsc;
use tokio_tungstenite::tungstenite::Message;
#[tokio::test]
async fn message_hander_handles_ping() {
let (tx, mut rx) = mpsc::unbounded_channel();
let filter_map = WebSocketMessageHandler::new(tx).into_filter_map();
filter_map(Message::Ping(b"0".to_vec())).await.unwrap();
let msg = rx.recv().await;
if let Some(Message::Pong(bytes)) = msg {
assert_eq!(b"0".to_vec(), bytes);
} else {
panic!("Ping did not Pong!");
}
}
}