darto_cache

Cache primitives for the Darto ecosystem — a tiny Cache interface, a zero-dep MemoryCache (LRU + TTL) and a RedisCache adapter for shared / distributed caching.

Install

dependencies:
  darto_cache: ^1.0.0

Quick start

import 'package:darto_cache/darto_cache.dart';

// In-process — zero deps, LRU optional
final cache = MemoryCache(maxEntries: 1024);

// Or shared / distributed
final cache = await RedisCache.connect(
  host: 'localhost',
  port: 6379,
  prefix: 'app:',
);

await cache.set('user:42', {'name': 'Eva'}, ttl: Duration(minutes: 5));
final user = await cache.get<Map<String, dynamic>>('user:42');

// Read-through — the helper you actually want
final post = await cache.remember<Map<String, dynamic>>(
  'post:$id',
  ttl: Duration(minutes: 1),
  builder: () => db.posts.findById(id),
);

cache.remember calls builder on miss, stores the result with ttl, and returns it. null is not cached — if builder returns null the next call will rebuild.

With darto_inject

final cacheProvider = AsyncProvider<Cache>(
  (di) => RedisCache.connect(
    host: di.read(envProvider).redisHost,
    prefix: 'app:',
  ),
  onDispose: (c) => c.close(),
);

app.get('/users/:id', [], (c) async {
  final cache = await c.readAsync(cacheProvider);
  final user = await cache.remember(
    'user:${c.req.param('id')}',
    ttl: Duration(minutes: 5),
    builder: () => userService.findById(c.req.param('id')!),
  );
  return c.ok(user);
});

API

Member	Description
Cache	Interface: get / set / delete / has / clear / close
cache.remember(key, {ttl, builder})	Read-through helper
MemoryCache({maxEntries})	In-process cache; LRU when maxEntries is set
RedisCache.connect({host, port, prefix})	Distributed cache over Redis

RedisCache notes

• Values are JSON-encoded; everything jsonEncode accepts round-trips.
• prefix is prepended to every key — clear() only drops keys under that prefix (via SCAN + batched DEL). When prefix is empty, clear() runs FLUSHDB and wipes the whole database.
• set with a ttl uses SET key value PX <ms> — sub-second TTLs round-trip.

Testing the Redis adapter

The included Redis test suite is tagged redis and boots a disposable container on a random host port:

dart test --tags redis     # only Redis suite
dart test                  # everything (incl. Redis if Docker is up)

docker must be on the PATH and able to pull (or already have) the redis:latest image.

---

Support 💖

If you find Darto Cache useful, please consider supporting its development 🌟Buy Me a Coffee.🌟