- Add kick-ch to SyncedAtom: swap!/reset! trigger immediate push
instead of waiting for the 15s sync loop interval
- SSE: pull on reconnect ("connected" message), not just on new events,
so coming back online picks up missed server changes
- TodoMVC: render and bind events before IDB load completes; the watch
re-renders automatically when cached data arrives
When any client pushes changes, the server broadcasts an SSE event to
all connected clients watching that group. Clients immediately pull
the latest data — no polling delay, no page reload.
Server (~30 lines):
- GET /events?group=G — SSE endpoint, holds connection open
- On successful POST /sync, notify all SSE listeners for affected groups
- Auth-aware: respects token and group permissions
- Auto-cleanup on disconnect via http-kit on-close
Client (~25 lines):
- EventSource connects to /events?group=G on sync loop start
- On SSE message, triggers do-pull! to fetch latest data
- Auto-reconnects (browser EventSource built-in behavior)
- Cleanup on destroy!
Periodic polling remains as fallback (30s default). SSE provides
sub-second sync for the common case.
Full TodoMVC implementation using Pocketbook's synced atom:
- Add, toggle, edit (double-click), destroy todos
- Filter: All / Active / Completed
- Toggle all, clear completed
- Live sync status indicator (online/offline/pending)
- Data persists in IndexedDB, syncs to server via Transit
Design: Ink & Paper aesthetic — cream paper background with grain
texture, Instrument Serif italic header, Newsreader body text,
DM Mono UI chrome, terracotta accent with green completion marks,
deckled left border on card.
Also:
- Server now serves static files from resources/public (/ → todomvc.html)
- Fix CLJS compilation: resolve close!/put! naming conflicts with
core.async, use qualified async/close!, add clojure.string require
- Fix unbalanced parens in do-pull!
- Remove old placeholder example
Offline-first key-value store with atom interface (swap!, deref,
add-watch) that syncs to a SQLite-backed server over Transit.
Server (CLJ):
- SQLite storage with Nippy serialization preserving all Clojure types
- GET /sync?group=G&since=T pull endpoint with prefix-based groups
- POST /sync push endpoint with per-document version checking
- Conflict detection (stale write rejection)
- Token-based auth with per-user group access
- CORS support, soft deletes, purge compaction
Client (CLJS):
- IndexedDB wrapper with Transit serialization
- SyncedAtom implementing IAtom (IDeref, ISwap, IReset, IWatchable)
- Write-through to IndexedDB on every swap!
- Background sync loop (pull + push) with configurable interval
- Online/offline detection with reconnect sync
- Conflict resolution (accept server value)
- ready? channel for initial load
- Custom cache atom support (Reagent ratom compatible)
25 tests, 77 assertions across db, transit, server, and auth.
