Footgun in gloo-net's `EventSource`

[allsey87]

I spent a good part of today debugging something that I think I would describe as a bit of footgun. To get straight to the point, consider the following code:

fn stream(
    mut self
) -> LocalBoxStream<'static, Result<(String, Option<String>), EventSourceError>> {
     self.event_source.subscribe("put").unwrap()
        .map_ok(|(event_type, message)| (event_type, message.data().as_string()))
        .boxed_local()
}

In this code, self.event_source is a gloo_net::eventsource::futures::EventSource, however the returned stream just returns a ConnectionError when it is pulled. I didn't fully get to the bottom of this, however, it seems that self.event_source is dropped after this function returns, which is either disconnecting the event handlers or closing the connection.

I am sure that my sloppiness is partly to blame here, however, I am used to Rust preventing these sorts of footguns. Is there anything that can be done to improve this?