Rocket App Hangs about rocket

[SergioBenitez]

There is a known issue with tokio that can cause this under certain conditions. Please see #2239. Does this sound like your problem?

[danbugs]

I don't think this is the same issue, because my app hangs even on a simple "Hello, World!" return, and my route is as simple as:

#[get("/")]
fn index() -> &'static str {
    "Hello, world!"
}

Here's a video demo:
video-demo

[danbugs]

Huh, never mind - I think this was actually not Rocket's fault. For context, I had my backend deployed on a Kubernetes cluster of Raspberry Pis and was accessing the backend through a NodePort service. I noticed that if I exec into the pod and curled it... It would never hang! So, to experiment, I tried swapping the NodePort for a LoadBalancer, and that did it 😅

This must be a problem w/ K3S's implementation of NodePorts. I'm closing the issue - thanks for the support👍

[SergioBenitez]

Looking at your source code, this does seem to also be an instance of that, you're just not hitting it yet. You're using diesel, the synchronous version, in an asynchronous context. This will block. You simply cannot mix sync and async code, especially when there's I/O. For diesel, you must use diesel_async. Note that this isn't Rocket specific - this is the case for any async Rust application.

[danbugs]

I don't think it should block when hitting my "Hello, World!" route though, no? Regardless, if the problem comes back, I'll make sure to change that. I appreciate your comment :)