The future of Rails begins in the browser

by Albert Pazderin

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Albert PazderiÄ Vladimir Dementyev The future of begins in the Rails browser

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https://guides.rubyonrails.org/getting_started.html#prerequisites https://guides.rubyonrails.org/install_ruby_on_rails.html

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https://rails-tutorial.evilmartians.io

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IDE, Node.js runtimS Terminal, file syste1 npm instal All in the browserÈ no server attacheF Zero-setuÂ development experience

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https://bolt.new by StackBlitz but with AI writing code Zero-setu$ vibe-coding experience

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Can we bring the same zero-setup UÄ to the Rails world? Where it could be the most beneficialÂ (spoiler: yes, we can0 (spoiler: learning)

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https://rails-tutorial.evilmartians.io THE TALK The Key Ingredient) The Challenges

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C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust

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C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust

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C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust

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C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust

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C Ruby Web browsers Standalone runtimes x86 ARM WASM .wasm Compiler (e.g. LLVM) Rust

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WASÆ module Browser Networking# File system?

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WASM-WASÄ module

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WASM-WASI module import "sys_call" ... call $sys_call WASI-compatible runtime Implements "sys_call"

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https://github.com/ruby/ruby.wasm

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Bringing Ruby to the Browser: ruby.wasm ruby.wasm WASM WASI Packaging toolchain

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Bringing Ruby to the Browser: ruby.wasm ruby.wasm WASM WASI Packaging toolchain a Pre-compiled Ruby Runtimes

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Bringing Ruby to the Browser: ruby.wasm ruby.wasm WASM WASI Packaging toolchain g Pre-compiled Ruby Runtimes g Gem packaging toolchain

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Bringing Ruby to the Browser: ruby.wasm G Pre-compiled Ruby Runtimes G Gem packaging toolchain G Compatibility patches ruby.wasm WASM WASI Packaging toolchain + patches

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The Final Ingredient: wasmify-rails wasmify-rails ruby.wasm Rails shims WASM WASI Packaging toolchain Rails config

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The Final Ingredient: wasmify-rails wasmify-rails ruby.wasm Rails shims WASM WASI Packaging toolchain Rails config

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The Final Ingredient: wasmify-rails wasmify-rails ruby.wasm Rails shims WASM WASI Packaging toolchain Rails config

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https://writebook-on-wasm.fly.dev

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wasmify-rails ruby.wasm Rails shims WASM WASI Packaging toolchain Rails config ? ?

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https://rails-tutorial.evilmartians.io

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https://rails-tutorial.evilmartians.io

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wasmify-rails ruby.wasm Rails shims WASM WASI Packaging toolchain Rails config Database Web server

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Database È SQLite.was È PGlite PGLite/SQLite.wasm Compatibility layer OFPS Indexed DB Memory

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Database SQLite.was" PGlite PGLite/SQLite.wasm Compatibility layer OFPS Indexed DB Memory Same API in the browser and Node.js

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Node.js?

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Web Applicaiton (main JS thread) WebContainer runtimH (isolated Web Worker) WebContainer API Client Terminal UI Node.js Runtim (V8 based) Virtual File Systek (in memory) Service Worke (browser-level network proxy) (HTTP Traffic) (HTTP Traffic) Preview Iframe

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WebContainer wasmify-rails ruby.wasm WASM WASI Packaging toolchain Rails config Rails shims Web server Database

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WebContainer wasmify-rails ruby.wasm WASM WASI Packaging toolchain Rails config Rails shims Web server Database

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THE CHallenge Express.js rails.wasm

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É È Ç Æ Å Ä Ã À 1Á 1 1É 1È 1Ç 1Æ 1Å 1Ä 18 module module class def self require new en" en! en" end RackuU Handlee WASIServee . (app, options1 port options[ 2 ::Rack:: ::IncomingHandler. (app1 a ::Wasmify::ExternalCommands.server(port1 register , WASIServee run ** = = "rack/wasi/incoming_handler :Port WASI :wasi # Init a global handler for the ap $incoming_handler # Signal to the JS host that the server is reads

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Rack::WASI::IncomingHandler ) ' & % $ # " ! 10 class def en2 end Rack:: ::IncomingHandlei (req, resE request Rack::MockRequest.env_for(uri.to_s, headersD response .call(requestD WASI handle # parse headero # ..f # ..f @app # handle responsp = =

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express.js 1. Receives HTTP request 2. Registers the request to the global scope 7 . Unpacks the data from the ruby response 8. Build & send the final response to the client 3. Invokes vm.evalAsync() & await rails.wasm 4. Reads request data from "JS.global" 6. Packages response into JS proxy object 5. Converts request into a standard Rack env hash & @app.call(env) Promise resolve trigger wm.evalAsync()

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THE CHallenge One cannot develop without a console

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È Ç Æ Ä Ã Â À 1Á 1 1 1È 1Ç 1Æ 1Ä 1Ã 1Â 1À 2Á 2 2 2È 2Ç 25 import from export default class async const await this this async await this null repl E IRBRepl Y () Y prompt .vm. ( Q repG . ({ prompt, eval .eval, writer rubyWriter }Q . ( , () process. ())D 5 V (cmd, _, _, callback) Y result .vm. ( ${cmd} )D ( , result)D 5 } "node:repl" h require "irbn class IRB::Ir def eval_code(codew # ..s enq enp $irb = IRB::Irb.new(nil, IRB::StdioInputMethod.neww ` 'exit' `$irb.eval_code( )` start evalAsync start on exit eval evalAsync callback = : : => =

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https:/ /github.com/kateinoigakukun/irb.wasm

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THE CHallenge bin/rails

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One-shot Interactive rails new rails generate rails routes rails server rails console

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One-shot Interactive rails new rails generate rails routes rails server rails console Solution: delegate to Rails

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One-shot Interactive rails new rails generate rails routes rails server rails console Solution: delegate to Rails

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É Ç Æ Å Ä Ã Â À 1Á 1 1É 1Ç 1Æ 1Å 1Ä 1Ã 1Â 1À 2Á 2 22 export default class this async function const await this async function return new return this ExternalCommands X (port) X . (vm) X server (vm, {skipRackup })I server. (port, () X . ( ${port} )H . ( )H })H 2 1 () X . (vm) X IRBRepl(vm). ()H 2 1 (vm) X . (vm)H 2 } server command createRackServer listen log log console command start invoke command = = : => console console = true `Express.js server started on port ` `Use Ctrl-C to stop`

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What about the UI?

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É È Ç Å Ä Ã Â À 1Á 1 1É 1È 14 import from const await const await const await await await { WebContainer } 4 webcontainerInstance WebContainer. ()5 files { {file {contents }}}5 webcontainerInstance. (files)5 process webcontainerInstance. ( , [ ])5 process.exit5 webcontainerInstance. ( , [ , ])5 webcontainerInstance. ( , (port, url) (iframeEl.src url)); '@webcontainer/api' "..." 'npm' 'install' 'npm' 'run' 'dev' 'server-ready' // Instantiatinf // File syste // `npm install // `npm run dev // Previe = = : : : = => = boot mount spawn spawn on 'package.json'

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