tokio VS axum

Being able to control nondeterminism is particularly useful for testing and debugging. This allows creating reproducible test environments, as well as discrete-event simulation for faster-than-real-time simulation of time delays. For example, Cardano uses a simulation environment for the IO monad that closely follows core Haskell packages; Sui has a simulator based on madsim that provides an API-compatible replacement for the Tokio runtime and intercepts various POSIX API calls in order to enforce determinism. Both allow running the same code in production as in the simulator for testing.

tokio / hyper / toml / serde / serde_json / json5 / console

tokio - An asynchronous runtime for Rust

3. Tokio

The AWS SDK makes use of the async capabilities in the Tokio library. So when you see async in front of a fn that function is capable of executing asynchronously.

Petar is also looking at implementing concurrency the way it is in Go to have a fully functional virtual machine as it is in the spec. This would likely attract more external contributors to developing the VM. One advantage of Rust is that, with the concurrency model, there is already an extensive library called Tokio which he can use. Petar stresses that this isn’t easy, but he believes it’s achievable, at least as a research topic around determinism and concurrency.

Another thing to point out is that async is a thing in Rust. I'm not going to begin to dive into this paradigm in this article, but know it's handled by the awesome Tokio framework.

So I started by using Tokio, a popular async runtime. The docs and samples helped me get a simple outbound TCP connection working. The Rust async book also had a lot of good explanations, both practical and digging into the details of what a runtime does.

Regarding the quote:

> The Original Sin of Rust async programming is making it multi-threaded by default. If premature optimization is the root of all evil, this is the mother of all premature optimizations, and it curses all your code with the unholy Send + 'static, or worse yet Send + Sync + 'static, which just kills all the joy of actually writing Rust.

Agree about the melodramatic tone. I also don't think removing the Send + Sync really makes that big a difference. It's the 'static that bothers me the most. I want scoped concurrency. Something like <https://github.com/tokio-rs/tokio/issues/2596>.

Another thing I really hate about Rust async right now is the poor instrumentation. I'm having a production problem at work right now in which some tasks just get stuck. I wish I could do the equivalent of `gdb; thread apply all bt`. Looking forward to <https://github.com/tokio-rs/tokio/issues/5638> landing at least. It exists right now but is experimental and in my experience sometimes panics. I'm actually writing a PR today to at least use the experimental version on SIGTERM to see what's going on, on the theory that if it crashes oh well, we're shutting down anyway.

Neither of these complaints would be addressed by taking away work stealing. In fact, I could keep doing down my list, and taking away work stealing wouldn't really help with much of anything.

The PHP <-> Rust bindings are provided by https://github.com/Nicelocal/ext-php-rs/ (our fork of https://github.com/davidcole1340/ext-php-rs with a bunch of UX improvements :).

php-tokio's integrates the https://revolt.run event loop with the https://tokio.rs event loop; async functionality is provided by the two event loops, in combination with PHP fibers through revolt's suspension API (I could've directly used the PHP Fiber API to provide coroutine suspension, but it was a tad easier with revolt's suspension API (https://revolt.run/fibers), since it also handles the base case of suspension in the main fiber).

There are some proposals on how to do it already such as https://github.com/tokio-rs/axum/issues/1698.

Moreover, I especially like where Rust is right now in the web space. It really feels like there’s a lot of smart people working on the next generation of web development tools - it feels like the place to be. There are a range of great open-source web dev tools that are just reaching critical levels of maturity. Axum, which I used to build Prodzilla, feels ready for out of the box web dev, and is crazy-performant, as I write about later. More recently available is Loco, a Rails-like framework for building web applications in Rust that's picking up steam. And in dev-tooling and hosting there’s Shuttle, a 1-line hosting solution for Rust backends.

CryptoFlow is a full-stack web application built with Axum and SvelteKit. It's a Q&A system tailored towards the world of cryptocurrency!

You also get to specify the accepted HTTP method of the URL via axum::routing. To answer its name, modularity, Axum also supports nested routes as we'll see later in this series. Next is the layer, a method used to apply tower::Layer to all routes before it. This means that routes added after the layer method will not have such a layer applied to their requests. In our case, we used the layer to add tracing to all HTTP requests and responses to our routes. This is needed for proper logging. The tower_http::trace::TraceLayer can even be really customised.

I build simple rust axum api server with Prisma client rust. This is my something done with rust and I really enjoyed rust!

In this article we'll take a comprehensive look at how to use Axum to write a web service. This will also include the 0.7 changes.

You have a couple of options for the underlying web framework to pair with Leptos: Axum or Actix. Axum seems to carry more favour currently, so we start with that. Assuming you already have Rust set up on your system:

I’m the author of https://kellnr.io. When I started working on Kellnr three years ago, https://rocket.rs was “the web framework” to use. Unfortunately, the project seems dead. Before adding more functionality using an unmaintained framework, I want to port Kellnr to https://github.com/tokio-rs/axum.

Web Framework : axum.