You will have to create a struct to hold your map and provide custom get/put/delete funcs to access it.
Note that 2-5k accesses per second is not really that much at all, so you don't have to worry about that.
Here's a simple implementation:
type item struct {
value string
lastAccess int64
}
type TTLMap struct {
m map[string]*item
l sync.Mutex
}
func New(ln int, maxTTL int) (m *TTLMap) {
m = &TTLMap{m: make(map[string]*item, ln)}
go func() {
for now := range time.Tick(time.Second) {
m.l.Lock()
for k, v := range m.m {
if now.Unix() - v.lastAccess > int64(maxTTL) {
delete(m.m, k)
}
}
m.l.Unlock()
}
}()
return
}
func (m *TTLMap) Len() int {
return len(m.m)
}
func (m *TTLMap) Put(k, v string) {
m.l.Lock()
it, ok := m.m[k]
if !ok {
it = &item{value: v}
m.m[k] = it
}
it.lastAccess = time.Now().Unix()
m.l.Unlock()
}
func (m *TTLMap) Get(k string) (v string) {
m.l.Lock()
if it, ok := m.m[k]; ok {
v = it.value
it.lastAccess = time.Now().Unix()
}
m.l.Unlock()
return
}
playground
note(2020-09-23): for some reason the time resolution on the current version of the playground is way off, this works fine, however to try on the playground you have to change the sleep to 3-5 seconds.
