Redis mock store for node cache manager

Redis mock cache store for node-cache-manager.

How is this package different from node-cache-manager-redis?

This is a completely different version than the earlier node-cache-manager-redis. This package does not use redis-pool which is unnecessary and not actively maintained.

This package aims to provide the most simple wrapper possible by just passing the configuration to the underlying node_redis package.

Installation

npm install cache-manager-redis-mock-store --save-dev

or

yarn add cache-manager-redis-mock-store --save-dev

Usage Examples

See examples below on how to implement the Redis mock cache store.

Single store

var cacheManager = require('cache-manager');
var redisMockStore = require('cache-manager-redis-mock-store').redisMockStore;

var config = {
  host: 'localhost', // default value
  port: 6379, // default value
  db: 0,
  ttl: 600
};

var redisCache = cacheManager.caching({
  store: await redisMockStore(config),
});

// listen for redis connection error event
var redisClient = redisCache.store.getClient();

var ttl = 5;

await redisCache.set('foo', 'bar', { ttl: ttl });

// You can use either a Promise...
var result = await redisCache.get('foo');
console.log(result);

// ...or a callback
redisCache.get('foo', (err, result) => {
  if (err) {
    // handle error here
  }
  console.log(result);
});

// >> 'bar'
console.log(await redisCache.del('foo'));
// >> 1

function getUser(id, cb) {
  setTimeout(() => {
    console.log("Returning user from slow database.");
    cb(null, { id: id, name: 'Bob' });
  }, 100);
}

var userId = 123;
var key = `user_${userId}`;

// Note: ttl is optional in wrap()
redisCache.wrap(key, (cb) => {
  getUser(userId, cb);
}, { ttl: ttl }, (err, user) => {
  console.log(user);

  // Second time fetches user from redisCache
  redisCache
    .wrap(key, () => getUser(userId))
    .then(console.log)
    .catch(err => {
      // handle error
    });
});

Multi-store

var cacheManager = require('cache-manager');
var redisMockStore = require('cache-manager-redis-mock-store').redisMockStore;

var redisCache = cacheManager.caching({ store: await redisMockStore({ ...config, db: 0, ttl: 600 }) });
var memoryCache = cacheManager.caching({ store: 'memory', max: 100, ttl: 60 });

var multiCache = cacheManager.multiCaching([memoryCache, redisCache]);

var userId2 = 456;
var key2 = `user_${userId2}`;

// Set value in all caches
await multiCache.set('foo2', 'bar2', { ttl: ttl });
// Fetches from highest priority cache that has the key
var result = await multiCache.get('foo2');
console.log(result);
// >> 'bar2'

// Delete from all caches
await multiCache.del('foo2');

// Note: ttl is optional in wrap
multiCache.wrap(key2, (cb) => {
  getUser(userId2, cb);
}, (err, user) => {
  console.log(user);

  // Second time fetches user from memoryCache, since it's highest priority.
  // If the data expires in the memory cache, the next fetch would pull it from
  // the 'someOtherCache', and set the data in memory again.
  multiCache.wrap(key2, (cb) => {
    getUser(userId2, cb);
  }, (err, user) => {
    console.log(user);
  });
});

Contribution

Want to help improve this package? We take pull requests.

License

The node-cache-manager-redis-mock-store is licensed under the MIT license.