Avoid Collisions, Desire Co-existence

2023 TokyuRubyKaigi 14 Lightening Talk about NameSpaces in Ruby and its motivations.
#tqrk14

Transcript

1. Satoshi Tagomori, a.k.a. tagomoris TokyuRubyձٞ14 - Jul 29, 2023 Avoid Collisions, Desire Co-existence Names, Modules, Versions, and NameSpaces
2. Satoshi Tagomori (@tagomoris) Independent developer Technical Consultant OSS Maintainer • Fluentd • MessagePack / msgpack-ruby • Norikra, Woothee, … tagomoris
3. https://www. fl ickr.com/photos/takkanm/3978417669 Asakusa.rb
4. 10൪ ϛχνϡΞ͓ͰΜ 11൪ ϩʔετϏʔϑΘ͞ͼϚϦω
5. Collisions in Ruby programs, processes
6. Collisions Names, Modules, Versions Name Collisions: No one can use a name in two ways. Module Collisions: Modules can be modified, globally, from anywhere. Version Collisions: Two different versions of a module can’t be loaded.
7. Name Collisions Two “Tagomori” Problem 😃 Tagomori module Tagomori
8. Name Collisions Two “Tagomori” Problem 😃 Tagomori 🤪 Tagomori module Tagomori
9. Name Collisions Many “Matsumoto” Problem module Matsumoto 🙂 Matsumoto
10. Name Collisions Many “Matsumoto” Problem module Matsumoto 🙂 Matsumoto (papa) 😀 Matsumoto (type) 😝 Matsumoto (katsyoshi)
11. Name Collisions In Fact: App vs Gem, App vs App, Gem vs Gem • RoR app classes vs Gem library module names • RoR app classes vs RoR app classes • “Con fi guration”
12. Module Collisions Module global con fi guration changes module Tagomoris (@black_magic:false) User App code Dependency library .method_call {result}
13. Module Collisions Module global con fi guration changes module Tagomoris (@black_magic:true) User App code Dependency library .enable_black_magic!
14. Module Collisions Module global con fi guration changes module Tagomoris (@black_magic:true) User App code Dependency library .method_call {result}
15. Module Collisions In Fact: Oj
16. Version Collisions Tagomoris v2 vs v1 User App code module Joker1007 VERSION: 3.1.4 module Tagomoris VERSION: 1.y.z
17. Version Collisions Tagomoris v2 vs v1 module Tagomoris VERSION: 2.0.x User App code module Joker1007 VERSION: 3.1.4 module Tagomoris VERSION: 1.y.z 😱
18. Version Collisions In Fact: Gem Dependency Hell https://www.activestate.com/blog/dealing-ruby-dependency-con fl icts/
19. Avoid Collisions
20. Desire Co-existence
21. NameSpaces In other words: “Multiverse Ruby” https://rubykaigi.org/2023/presentations/shioyama.html#day2
22. NameSpaces in languages Many ways, Many hells… • JavaScript/TypeScript (npm) • Copy everything, import one-by-one “in past” (download/copy cost …) • Install once, symbolic links, import one-by-one • Java (classes w/ FQDN) • Write once, install once, import locally (name collisions, dependency hell) • Class loaders (oops….) • Python (pip) • Install once, import one-by-one (dependency hell) • Go • Install once, import locally (name collisions)
23. NameSpace Requirements What is it? • One native extension libraries of two versions at a time Ruby Process LibraryX version: a.b.c “x.so” LibraryX version: x.y.z “x.so”
24. “དྷͨ, ݟͨ, …” “Veni, vidi, vici”
25. উͬͨο! ୈ1෦׬!
26. No, Still on the Way Native Extensions, Top-level References, Open classes, and… • Calling C-functions of di ff erent gem • Top-level references • Enforcing use of ‘::NAME’ to access top-level names • Silent failures of open class accesses • Automatic namespace adoptions • Accessing modules in namespaces without any source code updates • To be implemented in PoC
27. Next Step More Concerns, More Features, and Agreements • https://bugs.ruby-lang.org/issues/19744 • “[WIP] Namespace on Read PoC” https://github.com/tagomoris/ruby/pull/1 • and
 
 দߐRubyձٞ10
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