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exp-rediscache

v5.1.0

Published

A simple redis cache library

Downloads

777

Readme

rediscache

A Redis caching library meant to be used with exp-asynccache.

Usage:

const cache = new AsyncCache(new RedisCache());

const hit = cache.lookup("foo", (resolve) => {
  resolve(null, "baz");
});

hit.then((value) => {
  console.log(value); // value will be "baz"
});

Values cached with a maxAge uses Redis's SETEX command and sets a TTL on the key.

const cache = new AsyncCache(new RedisCache());

const hit = cache.lookup("foo", (resolve) => {
  resolve(null, "baz", 1000);
});

hit.then((value) => {
  console.log(value); // value will be "baz"
});

The underlying Redis client will queue up any commands if Redis is down. If you want instant errors back you can set the enableOfflineQueue option to false. This allows exp-asynccache to transparently fall back to the resolve callback in such a case.

const cache = new AsyncCache(new RedisCache({
  enableOfflineQueue: false
}));

To namespace your cache keys (in case you run multiple apps against the same Redis), you can specify the keyPrefix option.

const cache = new AsyncCache(new RedisCache({
  keyPrefix: "namespace"
}));

Dev

For local development and running tests:

$ npm ci
$ docker-compose up // starts the local redis instance
$ npm test