n00bing through Rust

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# n00bing through Rust

## Yuval Adam

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# Yuval Adam

- Full stack developer
- Freelance consultant
- 10+ years Pythonista, Rust n00b
- [https://yuv.al](https://yuv.al)
- [@yuvadm](https://twitter.com/yuvadm)

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## Baby steps

- [https://doc.rust-lang.org/book/second-edition/](https://doc.rust-lang.org/book/second-edition/)
  - Book is a great reference for specific concepts
  - That's it.
- [https://exercism.io/tracks/rust](https://exercism.io/tracks/rust)
  - Exercism is a good *exercise*
- But I need a real-world project...

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# HDMI "Anycast"

- Reverse engineering a cheap HDMI/UPnP dongle
- [https://github.com/yuvadm/rockcast](https://github.com/yuvadm/rockcast)

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# UPnP Casting

- Send a UPnP discovery packet over **UDP** broadcast
- Dongle on LAN responds with some fugly **XML**
- Serve the media file over **HTTP**
- Send an XML request to the dongle pointing to the file
- Send play/pause actions as neccesary

You can implement this with several dozen lines of Python/JS (or any other modern "dynamic" language)

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# UPnP Casting

## Dependencies

- `clap` for CLI
- `hyper` for HTTP calls
- `tokio-fs` for serving the static file
- `tokio-io` for handling UDP traffic
- `tokio` for wrapping it all in one runtime
- `futures`  because... you need it

It's on [https://github.com/yuvadm/slingr](https://github.com/yuvadm/slingr)

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# .white[Rust is **not** a high-level language]

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# RTL-SDR

- A very cool piece of hardware used as *poor man's Software Defined Radio*
  - [SDR Intro talk at PyCon 2018](https://www.youtube.com/watch?v=xJOFaOM2wUc) (not really a Python talk)
- Reference library implemented in C + heavy usage of `libusb`
- Let's do an exercise rewrite!

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![](https://i.imgur.com/8acN5PG.png)

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# `impl RtlSdr`

- C **is** the original systems programming language
- Writing low-level code gives you a much better grasp of the language vs. C
- Personal anecdote:
  - *really* hard to stop thinking in OOP terms
  - Especially not having **inheritance** in your toolkit

Work in progress at [https://github.com/yuvadm/rustl-sdr/](https://github.com/yuvadm/rustl-sdr/)

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# **Idiomatic** Rust

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# .white[Mentors]

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## `:s/mentors/references/g`

- [Unofficial Rust API Guidelines](https://rust-lang-nursery.github.io/api-guidelines/)
- [Unofficial Rust Design Patterns](https://github.com/rust-unofficial/patterns)
- [Writing an OS in Rust](https://os.phil-opp.com/)
- [Writing a browser layout engine in Rust](https://limpet.net/mbrubeck/2014/08/08/toy-layout-engine-1.html)
- [Building a DNS server in Rust](https://github.com/EmilHernvall/dnsguide)

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# Thanks!

## Questions?