Is it possible to put mpsc channel into a state

[oOBoomberOo]

I ran into an issue with storing Tokio's mpsc::UnboundedSender into the state middleware to send a message to another thread to do some task. Running the task directly from the request isn't an option since this is a long-running I/O task.

The issue seems to be that the channel's implementation used UnsafeCell, causing the error below.

error[E0277]: the type `UnsafeCell<AtomicUsize>` may contain interior mutability and a reference may not be safely transferrable across a catch_unwind boundary

Is this something doable within this framework, or is there any workaround for this?

[msrd0]

This looks like a similar problem to #570 - it might not be possible to store that sender in the state if it isn't unwind safe.

I guess the work around would be to not store non-unwind safe structs in the state? You can always store them somewhere else (e.g. in a static variable) and use that from your handler - handler's are just Rust functions after all.

[oOBoomberOo]

Hmm, I think that should work for my use case.