Issue with nightly rust and specific rust flags

[mhchia]

Description

I've encountered an issue with the library when using the nightly Rust version in conjunction with the rustflags +atomics,+bulk-memory,+mutable-globals.

Here's the relevant code snippet:

    let (mut ws_meta, mut ws_stream) = WsMeta::connect(ws_server_url, None).await
        .expect_throw("Assumed the client ws connection would succeed");
    let mut io_stream = ws_stream.into_io();
    let message = b"Hello from browser".to_vec();
    io_stream
        .write(&message).await
        .expect_throw("Failed to write to websocket");

While attempting to write to a websocket (io_stream), the operation fails.

Environment

OS: macOS 12.6
cargo: 1.68.0-nightly (70898e522 2022-12-05)
rustc: 1.68.0-nightly (bdb07a8ec 2022-12-11)
Browser: Chrome Version 116.0.5845.140 (Official Build) (x86_64)

Reproduction Steps

For a detailed step-by-step reproduction guide, please refer to this repository.

I'd greatly appreciate any feedback, solutions, or clarifications regarding this issue.

[najamelan]

Thanks for reporting. I'll try to address this this weekend.

[mhchia]

Just an update on our end: my colleague found this line failed

ws_stream_wasm/src/ws_stream.rs

Line 314 in 4035d46

WsMessage::Binary( d ) => self.ws.send_with_u8_array( &d ).map_err( |_| WsErr::ConnectionNotOpen )? ,

If the line is replaced by

WsMessage::Binary(d) => {
	let buffer = ArrayBuffer::new(
		d.len()
		.try_into()
		.expect("Message was too large to be sent."),
	);
	Uint8Array::new(&buffer).copy_from(d.as_slice());
	self.ws
		.send_with_array_buffer(&buffer)
		.map_err(|_| WsErr::ConnectionNotOpen)?
}

, it works. However, we then encountered a oom issue with our application

I was guessing it is related to memory leaking, for example, buffer is not gc'ed and too many writes may end up using up the memory. But it's just my suspicion and I haven't verified it and may be wrong.

Hope these information will be helpful 🙏