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Merged
merged 1 commit into from
Oct 30, 2025
Merged

feat: handle upstream binary messages to allow being run as a middleman #426

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8 changes: 4 additions & 4 deletions crates/websocket-proxy/src/main.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -242,16 +242,16 @@ async fn main() {
let (send, _rec) = broadcast::channel(args.message_buffer_size);
let sender = send.clone();

let listener = move |data: String| {
trace!(message = "received data", data = data);
let listener = move |data: Vec<u8>| {
trace!(message = "received data", data = ?data);
// Subtract one from receiver count, as we have to keep one receiver open at all times (see _rec)
// to avoid the channel being closed. However this is not an active client connection.
metrics_clone
.active_connections
.set((send.receiver_count() - 1) as f64);

let message_data = if args.enable_compression {
let data_bytes = data.as_bytes();
let data_bytes = data.as_slice();
let mut compressed_data_bytes = Vec::new();
{
let mut compressor =
Expand All @@ -260,7 +260,7 @@ async fn main() {
}
compressed_data_bytes
} else {
data.into_bytes()
data
};

match send.send(message_data.into()) {
Expand Down
59 changes: 35 additions & 24 deletions crates/websocket-proxy/src/subscriber.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -63,7 +63,7 @@ impl Default for SubscriberOptions {

pub struct WebsocketSubscriber<F>
where
F: Fn(String) + Send + Sync + 'static,
F: Fn(Vec<u8>) + Send + Sync + 'static,
{
uri: Uri,
handler: F,
Expand All @@ -74,7 +74,7 @@ where

impl<F> WebsocketSubscriber<F>
where
F: Fn(String) + Send + Sync + 'static,
F: Fn(Vec<u8>) + Send + Sync + 'static,
{
pub fn new(uri: Uri, handler: F, metrics: Arc<Metrics>, options: SubscriberOptions) -> Self {
let backoff = ExponentialBackoff {
Expand Down Expand Up @@ -255,14 +255,17 @@ where
);
self.metrics
.message_received_from_upstream(self.uri.to_string().as_str());
(self.handler)(text.to_string());
(self.handler)(text.as_bytes().to_vec());
}
Message::Binary(data) => {
warn!(
message = "received binary message, unsupported",
trace!(
message = "received binary message",
uri = self.uri.to_string(),
size = data.len()
payload = ?data.as_ref()
);
self.metrics
.message_received_from_upstream(self.uri.to_string().as_str());
(self.handler)(data.as_ref().to_vec());
}
Message::Pong(_) => {
trace!(
Expand Down Expand Up @@ -300,15 +303,15 @@ mod tests {

struct MockServer {
addr: SocketAddr,
message_sender: broadcast::Sender<String>,
message_sender: broadcast::Sender<Vec<u8>>,
shutdown: CancellationToken,
}

impl MockServer {
async fn new() -> Self {
let listener = TcpListener::bind("127.0.0.1:0").await.unwrap();
let addr = listener.local_addr().unwrap();
let (tx, _) = broadcast::channel::<String>(100);
let (tx, _) = broadcast::channel::<Vec<u8>>(100);
let shutdown = CancellationToken::new();
let shutdown_clone = shutdown.clone();
let tx_clone = tx.clone();
Expand Down Expand Up @@ -347,7 +350,7 @@ mod tests {

async fn handle_connection(
stream: TcpStream,
tx: broadcast::Sender<String>,
tx: broadcast::Sender<Vec<u8>>,
shutdown: CancellationToken,
) {
let ws_stream = match accept_async(stream).await {
Expand All @@ -369,8 +372,8 @@ mod tests {
}
msg = rx.recv() => {
match msg {
Ok(text) => {
if let Err(e) = ws_sender.send(Message::Text(text.into())).await {
Ok(data) => {
if let Err(e) = ws_sender.send(data.into()).await {
eprintln!("Error sending message: {}", e);
break;
}
Expand All @@ -386,9 +389,9 @@ mod tests {

async fn send_message(
&self,
msg: &str,
) -> Result<usize, broadcast::error::SendError<String>> {
self.message_sender.send(msg.to_string())
msg: &[u8],
) -> Result<usize, broadcast::error::SendError<Vec<u8>>> {
self.message_sender.send(msg.to_vec())
}

async fn shutdown(self) {
Expand Down Expand Up @@ -440,7 +443,7 @@ mod tests {
}
});

let listener_fn = move |_data: String| {
let listener_fn = move |_data: Vec<u8>| {
// Handler for received messages - not needed for this test
};

Expand Down Expand Up @@ -482,7 +485,7 @@ mod tests {
let received_messages = Arc::new(Mutex::new(Vec::new()));
let received_clone = received_messages.clone();

let listener = move |data: String| {
let listener = move |data: Vec<u8>| {
if let Ok(mut messages) = received_clone.lock() {
messages.push(data);
}
Expand Down Expand Up @@ -526,13 +529,21 @@ mod tests {

sleep(Duration::from_millis(500)).await;

let _ = server1.send_message("Message from server 1").await;
let _ = server2.send_message("Message from server 2").await;
let _ = server1
.send_message("Message from server 1".as_bytes())
.await;
let _ = server2
.send_message("Message from server 2".as_bytes())
.await;

sleep(Duration::from_millis(500)).await;

let _ = server1.send_message("Another message from server 1").await;
let _ = server2.send_message("Another message from server 2").await;
let _ = server1
.send_message("Another message from server 1".as_bytes())
.await;
let _ = server2
.send_message("Another message from server 2".as_bytes())
.await;

// Wait for messages to be processed
sleep(Duration::from_millis(500)).await;
Expand All @@ -552,10 +563,10 @@ mod tests {

assert_eq!(messages.len(), 4);

assert!(messages.contains(&"Message from server 1".to_string()));
assert!(messages.contains(&"Message from server 2".to_string()));
assert!(messages.contains(&"Another message from server 1".to_string()));
assert!(messages.contains(&"Another message from server 2".to_string()));
assert!(messages.contains(&"Message from server 1".as_bytes().to_vec()));
assert!(messages.contains(&"Message from server 2".as_bytes().to_vec()));
assert!(messages.contains(&"Another message from server 1".as_bytes().to_vec()));
assert!(messages.contains(&"Another message from server 2".as_bytes().to_vec()));

assert!(!messages.is_empty());
}
Expand Down
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