class: middle, center # RustCon Asia 2019 見聞錄 <img style="border-radius: 50px" src="https://www.gravatar.com/avatar/67644641ead7ae60a795a14b7e102973?s=100" alt="Weihang Lo"> <a href="https://github.com/weihanglo">@weihanglo</a> --- ## Agenda - Why Attended RustCon Asia - Messages from Rust Core Team - Talks. Talks. Talks. - Workshops --- ## Who am I? Weihang Lo ([@weihanglo](https://github.com/weihanglo)) - 工友 @ [Hahow 好學校](https://hahow.in) - 2017 開始關注 Rust - 寫過 Rust DRM system（但離職後專案大概掛了...） - 維護 [Rust Algorithm Club](https://rust-algo.club)（長草中） --- ## Why Attended RustCon Asia - ⭐️ 想精進自己的 Rust 功力 - ⭐️⭐️ 想認識來自遠方的 Rustacean - ⭐️⭐️ 想跟見上一面各路大神 - ⭐️⭐️⭐️ 想了解 Rust 在亞洲的生態與應用場景 ---  --- class: middle, center ## Messages from Rust Core Team --- ## 2018: stability without stagnation - Features - Non-lexical lifetimes - procedural macros - match ergonmics - Module system - Tools - Rustfmt - Clippy - IDE support - cargo fix - Working groups - WASM - Embedded - CLI - Networking --- ## 2018 survey 30% work in production 25% more loc only 2% felt unwelcoming in Rust community 93% think it's easy to fix breaking changes --- ## 2019: Maturity #### Governance - Immerse newcomer joined in the past years. - Some discussions of RFC gets 300+ comments #### Stablize Long-standing Requests - Custom allocators (done) - async/await (almost done?) - const generics - Generic associated types - Specialization - custom registries (done) #### Polish - compile-time - IDE support --- class: middle, center ## Talks. Talks. Talks. --- ## Categories - Blockchain/Security/Cryptography: 2 - Security/Cryptography: 1 - Competitive Programming: 1 - Concurrenct Programming: 3 - WebAssembly: 1 - Linux/DevOps: 3 - Learning: 3 - Prod. Experiences: almost all in production! --- ## Who use Rust in production? #### Baidu X-Lab 百度安全實驗室 - [MesaLock Linux](https://github.com/mesalock-linux)：userspace 的工具如 login, getty, init, coreutils - [MesaPy](https://github.com/mesalock-linux/mesapy): Memory safe Python interpreter，replaced unsafe lib with Rust #### Bilibili 嗶哩嗶哩 - Remote cache service (for CI/CD) - 需求：儲存 Bazel + Gradle 編譯中間產物、QPS: 5000、3TB update/day - 用 CGO 很難寫 SIMD（需要寫 asm）。Rust 的 SIMD 完勝。 - Thumbnail service - 原本使用 CGO 寫的將 PNG/JEPG/WEBP -> transfrom/clip -> WEBP 格式 - Rsut export FFI 配合 actix-web 比 Go 版本快 3 倍。 - Cache Proxy: 2x faster than Go version --- ## Who use Rust in production? #### Zhihu 知乎 - Search service：取代 Rucene (Ruby binding Lucene)。用 Lucene 不敢將 CPU 操到 > 80%，怕 GC 雪崩。 #### Alibaba 阿里巴巴 - Distributed Actor System：在 actix 之外自幹符合需求的 actor system - Realtime Image Rendering Service - 淘寶 app 廣告 banner，針對單一使用者客製化產生 - 2016 就上線撐過 2017 2018 兩次雙十一 - 原本 Node.js QPS: 60, RT: 200ms；**Rust QPS: 3000, RT: 10ms** - 阿里內部還無法部署 Rust，所以偽裝成 Node.js App --- ## Who use Rust in production? #### [PingCAP](https://pingcap.com/) - [TiKV][tikv]: a distributed transactional key-value database, also a **CNCF incubating project**. [][tikv] [tikv]: https://tikv.org/ --- class: middle, center ## Workshops --- ### How to Think in Rust **Q: Why don't `Box` (or other owning types) need a lifetime parameter?** **Q: Why is it an ownership graph but not a tree?** **Q: What is the roots of the ownership graph?** **Q: How does ownership relate to mutability?** --- ### How to Think in Rust **Q: Why don't `Box` (or other owning types) need a lifetime parameter?** Lifetime parameter is redundant for owning type. **Q: Why is it an ownership graph but not a tree?** To be a tree, it can only have exactly one owner. An owenship relationship is actually a directed acyclic graph (DAG). **Q: What is the roots of the ownership graph?** - Each stack frame which owns it's local variables - Any data with the `'static` lifetime. **Q: How does ownership relate to mutability?** Mostly you need to own something in order to mutate it, except some types with interior mutabililties. --- ### How to Think in Rust  --- class: middle, center ## Some Thoughts --- .center[<img src="https://imgur.com/CaVLkdz.png" width="600px">] [Rust Meetup](https://www.meetup.com/topics/rust/) --- ### We need more Rustaceans in Asia! - No Japanese? - No Korean? - Not too many East South Asian (only met one Singaporean) - Workshops/Talks did not grade by difficulty. - Though there are interpreters, most talks in Chinese may prevent attendants outside Chinese culture sphere. - Maybe Some day RustCon Asia can be held in Taiwan! --- ## Facts about Rust Conferences | Conference | Location | Attendants | Talks | Workshops | Rust Teams Member | | --------------------------------------------------- | ------------------- | ---------- | ------------- | --------- | ------------------- | | [RustCon Asia 2019](https://rustcon.asia/) | Beijing, China | ~300 | 16 / 1.5 days | 12/2 days | 2 (1 in core team) | | [Rust Latam 2019](https://rustlatam.org) | Montevideo, Uruguay | ~150? | 9 | 5 | 5 (2 in core team) | | [Rust Conf 2018](https://rustconf.com/) | Portland, USA | ~350 | 16 / 2 tracks | 7 | a lots | | [Rust Rush 2018](https://rustrush.ru/) | Moscow, Russia | ~100? | 10 | 2 | 4 (2 in core team) | | [RustFest Rome 2018](https://barcelona.rustfest.eu) | Rome, Italy | ~150? | 11 | 7 | 2 (1 in core team) | --- class: middle, center ## New Definition of "OOP": ## Ownership Oriented Programming ---  --- ## References [Slides are here](https://talk.citahub.com/t/topic/590), [here](https://shimo.im/docs/zliTJIGgNwk6QIFh/read) and [here](https://www.dropbox.com/sh/sk3guk4qei9sn78/AADfXHuzUPic35ELOQ5rGATra?dl=0) [Videos are here](https://www.youtube.com/playlist?list=PL85XCvVPmGQjPvweRqkBgnh_HKE5MBB8x) --- class: middle, center # Any advice? We are from [Hahow 好學校](https://hahow.in/). Ask us anything!