Caching helper

Create a short-term cache in your app.

note

This feature is experimental, which means the design not final but it's still available for you to use.

The cache helper will let you cache JSON objects in your devvit apps for a limited amount of time. Under the covers, It's Redis plus a local in-memory write-through cache. This provides a pattern for e.g. fetching data without involving a scheduler, and allows granular, small TTLs (like 1 second).

This is probably a better fit for your in-app caching needs than using scheduler or interval to fetch!

let component = (context) => {
  let cached = context.cache(
    async () => {
      let rsp = await fetch('https://soemthing.com');
      return rsp.body;
    },
    {
      key: 'some-fetch',
      ttl: 10_000, // millis
    }
  );

  doSomethingWith(cached);
  return <text>yay</text>;
};

There are only two properties:

key is used to specify a specific item to be cached (i.e. if you have two function calls to cache that share a key, they will return the same value with the same lifetime).

ttl specifies "time-to-live", the duration of how long the cached item is retained for.