</> qemu browser labs

# components

• client xterm.js

  terminal emulator for browser

  xterm.js v5
• service qemu wasm

  full system emulator compiled to webassembly

  qemu 8.xemscripten
• service block manager

  manages lazy-loaded 64kb disk blocks with lru caching

  javascriptindexeddb
• cache indexeddb

  browser-side block cache surviving page refresh

  indexeddb
• service service worker

  intercepts http requests from guest vm

  service workerc2w-net-proxy
• service api worker

  entry point for all api requests, handles auth

  cloudflare workers
• service session do

  stateful session with sqlite storage and websocket

  durable objectshibernation api
• service rate limit do

  distributed rate limiting across edge locations

  durable objects
• database r2

  object storage for blocks, overlays, and checkpoints

  cloudflare r2
• cache kv

  read-heavy cache for manifests and hot blocks

  cloudflare kv
• database d1

  session metadata and checkpoint pointers

  cloudflare d1sqlite
• queue telemetry queue

  async telemetry events for block access patterns

  cloudflare queues
• queue gc queue

  triggers cleanup of stale sessions and overlays

  cloudflare queues
• queue build queue

  triggers lab build workflow on dockerfile upload

  cloudflare queues
• external analytics engine

  stores block telemetry for hot bundle optimization

  analytics engine
• service build workflow

  durable, resumable lab build pipeline

  cloudflare workflows
• external r2 event

  r2 bucket event notification on upload

  r2 event notifications