This provides the lru package which implements a fixed-size thread safe LRU cache. It is based on the cache in Groupcache.

Full docs are available on Godoc

Using the LRU is very simple:

l, _ := New(128)
for i := 0; i < 256; i++ {
    l.Add(i, nil)
}
if l.Len() != 128 {
    panic(fmt.Sprintf("bad len: %v", l.Len()))
}