rio VS ureq

Also, not to be too bad about a reputation fallacy, but I found the author to be flippant and disrespectful when good-faith unsoundness was pointed out in his crates: https://github.com/spacejam/rio/issues/30

In my previous post on linear types I spent quite a bit of time motivating linear types. For example the ergonomic rio io_uring library could be made sound if it could guarantee destructors are run. Or performing FFI with async C++ could be made more efficient if it could rely directly on destructors rather than having to involve an intermediate runtime for each call.

It's like cargo should have a way to mark a dependency as unsafe. That way, you could have a safe mmap crate as an unsafe dependency. Or something like rio which is deliberately unsound (but is fine if you abide by its rules through the entirety of the program)

for completeness there is also rio, but:

rio still has known soundness issues– its Completion futures block the thread when dropped (!!!), and can allow for use-after-free bugs if leaked. See https://github.com/spacejam/rio/issues/30 for details.

Here are some posts about the design. https://without.boats/blog/io-uring/ https://github.com/spacejam/rio/issues/30 https://github.com/axboe/liburing/issues/109

The author of sled[1], an embedded database in Rust which has a number of promising features, has also written parts of rio[2], an underlying pure Rust io_uring library, which is intended to become the core write path for sled. rio has support for files but also has a demo for TCP (on Linux 5.5 and later) and O_DIRECT.

I tested rio recently as I had a Brilliant but Bad Idea™ involving file access and was pleasantly surprised by the API, as I have been with sled's.

I'm excited for the experimentation in the Rust ecosystem and for such low level crates to handle the complex io_uring tasks (relatively) safely!

[1]: https://github.com/spacejam/sled

[2]: https://github.com/spacejam/rio

I also enjoyed using ureq as an http client.

After a quick check of the available rust http client libraries I opted for reqwest. It has a pretty simple API and it seems to be among the most used libraries for this matters. But I'm a bit concerned about all its dependencies so I might try ureq later.

Async is only useful when you have hundreds of connections open at the same time and idling most of the time; otherwise it's a liability. If your web API does not allow that (e.g. it has rate-limiting, which most APIs do), I suggest going with a client that performs blocking I/O and spawning threads if you need parallelism. https://github.com/algesten/ureq should fit the bill.

I think you'll find a lot of people claiming its overkill, but it will have excellent documentation for both sides, offer reasonable speed, and let you hash out the actual logic of your system without worrying too much about if your low-level implementation is correct. Two good frameworks for the server would be Actix or Rocket. For the client, i'd reccomend either using reqwest or ureq. From there, you can just set up a few POST endpoints, and get to going.

If you want an HTTP client with few dependencies and little unsafe code, take a look at https://github.com/algesten/ureq

Give ureq a try: https://github.com/algesten/ureq