Viewing profile — wh33zle

How low do you need the footprint? At firezone.dev, we also build a ZT product and our headless-client and Gateway are in Rust and use around 15-30 MB of RAM. Could likely be tuned…

One of the coolest things I've learned about recently is `.git/info/exclude`. It allows you to ignore files in the local repo without modifying the repo's .gitignore Very useful if…

Depends. MASQUE implies QUIC and a lot of coporate networks still block QUIC, forcing a fallback to TCP (for web browsers). Not sure how they want to address this in case of WARP? …

I find myself defining my own traits very rarely these days. Traits enable polymorphic actions on data. Most of the time, you simply don't need that. An enum often suffices to expr…

WASM shouldn't care about which language the host is written in vs what the apps are written in. Writing the host in C seems like a bad choice though. Isn't that exactly the kind o…

> An async method, basically does the same, but it means your logic doesn't have to handle the polling, orchestration, selection, ordering, etc. In order to take advantage of that,…

Thinking about your example again made me think of another requirement: Multiplexing. STUN ties requests and responses together with a transaction ID that is encoded as an attribut…

> The stream is a stream of Result Fair point! Yeah that would allow error handling the state machine. > > Lastly, and this is where using async falls apart: If you try to model th…

This isn't an adequat comparison in my eyes. Your example moves a very critical component out if the "protocol logic": message parsing. Dealing with invalid messages is crucial in …

> [EDIT2] Any good recommendations of a tiny protocol that might be a good walk through intro to this? > > Something even simpler than Gopher or SMTP? Would be nice to have a reall…

> What am I missing here? From unrelated code, I want to call `get_ip_via_stun_or_timeout(hostnames: &[String], timeout: Duration) -> Option `, is what I'm missing that I need to w…

> If I want to write a function that listens or times out in sans-IO style, should I use tokio::select? If so, where is the async runtime coming from, and how will the caller of th…

The line between applications and libraries is fairly blurry, isn't it? In my experience, most applications grow to the point where you have internal libraries or could at least sp…

> I would have been more interested in seeing how they could implement an encapsulated function in the sans-IO style that had to do something like wait on an action or a timer The …

I too came from the OOP world to Rust (6 years ago now) and in my first 2-3 years I produced horrible code! Type parameters and traits everywhere. Structs being (ab-)used as class-…

Channels work fine if you are happy for your software to have an actor-like design. But as you say, it comes with problems: Actors / channels can be disconnected for example. You a…

If Rust ever gets a native generator syntax, this might be become achievable because one would be able to say: `yield transmit` to "write" data whilst staying within the context of…

They actually play together fairly well higher up the stack. Non-blocking IO (i.e async) makes it easy to concurrently wait for socket IO and time. You can do it with blocking IO t…

Yes, traffic is routed to the gateway through a WireGuard tunnel. Broadly speaking, what happens is: - Client and gateway perform ICE to agree on a socket pair (this is where hole-…

Haha thank you! Yes there are indeed similarities to rust-libp2p! Over there, things are more interleaved though because the actual streams and connections are still within `Future…

I tried to address this at the end of the post: If what you are implementing is mostly _sequential_ IO operations, then this model becomes a bit painful. That isn't always the case…

Yes! Decoupling is the goal of this! Using non-blocking IO is still useful in this case because it means we can wait on two conditions at once (i.e. socket IO and time), see [0]. I…

In Firezone's case, things are built on top of UDP so technically there aren't any (kernel-managed) connections and only a single file descriptor is allocated for the UDP socket. T…

I did some quick research and found that there is an "async job" API in OpenSSL. That one appears to do IO though, it even says that creating a job is a very expensive operation an…