Question: Support for async-std runtime?

[moulo19821]

Hi,

Is there any plan to support the async-std runtime in the MongoDB Rust driver, similar to how it currently supports tokio?

The driver currently seems to depend on tokio for async I/O and runtime features, which makes it incompatible with async-std out of the box. I'm wondering if multi-runtime support (or async-std as an option) is on the roadmap.

Thanks!

[moulo19821]

Or smol？

[abr-egn]

We supported both tokio and async-std in the 2.x versions of the driver; however, our telemetry showed that the async-std runtime was essentially never used. Maintaining the internal compatibility layer added substantial complication and ongoing maintenance burden, so we chose to drop that support starting with 3.0. With the async-std project officially discontinued, that's unlikely to be revisited.

If smol (or another executor) gains substantial traction in the overall Rust ecosystem we'll definitely consider adding support for it, but as far as we can tell that's not the case yet - smol gets less than 5% of the downloads that tokio does, for example.