Caching data in memory

To cache a series of values in memory, we will use github.com/patrickmn/go-cache. With this package, we can create an in-memory cache of keys and corresponding values. We can even specify things, such as the time to live, in the cache for specific key-value pairs.

To create a new in-memory cache and set a key-value pair in the cache, we do the following:

// Create a cache with a default expiration time of 5 minutes, and which
// purges expired items every 30 seconds
c := cache.New(5*time.Minute, 30*time.Second)

// Put a key and value into the cache.
c.Set("mykey", "myvalue", cache.DefaultExpiration)

To then retrieve the value for mykey out of the cache, we just need to use the Get method:

v, found := c.Get("mykey")
if found {
    fmt.Printf("key: mykey, value: %s\n", v)
}