About this Sinatra app

This is app/hello.rb, a real sinatra/sinatra 4.x application running on Cloudflare Workers. Phase 13 moved off the old janbiedermann/sinatra fork; we now track upstream Sinatra with Opal-specific patches in-repo. The file would run unchanged on any Rack server; the Cloudflare adapter lives entirely in lib/cloudflare_workers.rb and does not leak through.

Architecture

How the pieces fit

• Sinatra DSL → Opal compiler → a ~1.07 MiB gzipped ESM bundle (~1068 KiB after Phase 15-Pre; previously ~580 KiB / ~1.3 MiB in older snapshots)
• ERB templates in views/*.erb → precompiled by bin/compile-erb → HomuraTemplates registry → erb :name helper
• Cloudflare bindings cover D1, KV, R2, Workers AI, Queues, Durable Objects, and the Workers Cache API. Ruby reaches D1/KV/R2/AI/queues/DO namespaces via env['cloudflare.DB'], env['cloudflare.KV'], env['cloudflare.BUCKET'], env['cloudflare.AI'], env['cloudflare.QUEUE_*'], and env['cloudflare.DO_*']; cache reads/writes use the Cloudflare::Cache wrapper over caches.default / caches.open.
• Phase 12.5 added Fiber-transparent await; most routes no longer hand-roll .__await__. Edge cases that still need explicit async can use # await: true as before.

Posts, login, and chat (Phase 14)

The app now includes /posts backed by a D1 posts table, /login for the session / OAuth-style login flow, and /chat for the streaming assistant UI. Together they exercise bindings, templates, and async paths beyond the original hello-world surface.

Recent improvements (Phase 15-Pre)

Deploy reliability improved: wrangler deploy succeeded three times in a row on the tightening bundle. The worker JS shrank roughly 34% in compressed size versus the pre-Phase-15 peak (including dropping much of opal-parser and trimming corelib/IRB paths from the shipped gem).

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