mirror of https://github.com/statping/statping
114 lines
2.0 KiB
Go
114 lines
2.0 KiB
Go
package handlers
|
|
|
|
import (
|
|
"github.com/statping/statping/utils"
|
|
"sync"
|
|
"time"
|
|
)
|
|
|
|
var CacheStorage Cacher
|
|
|
|
type Cacher interface {
|
|
Get(key string) []byte
|
|
Delete(key string)
|
|
Set(key string, content []byte, duration time.Duration)
|
|
List() map[string]Item
|
|
Lock()
|
|
Unlock()
|
|
StopRoutine()
|
|
}
|
|
|
|
// Item is a cached reference
|
|
type Item struct {
|
|
Content []byte
|
|
Expiration int64
|
|
}
|
|
|
|
// cleanRoutine is a go routine to automatically remove expired caches that haven't been hit recently
|
|
func cleanRoutine(s *Storage) {
|
|
duration := 5 * time.Second
|
|
|
|
CacheRoutine:
|
|
for {
|
|
select {
|
|
case <-s.running:
|
|
break CacheRoutine
|
|
case <-time.After(duration):
|
|
for k, v := range s.List() {
|
|
if v.Expired() {
|
|
s.Delete(k)
|
|
}
|
|
}
|
|
duration = 5 * time.Second
|
|
}
|
|
}
|
|
}
|
|
|
|
// Expired returns true if the item has expired.
|
|
func (item Item) Expired() bool {
|
|
if item.Expiration == 0 {
|
|
return false
|
|
}
|
|
return utils.Now().UnixNano() > item.Expiration
|
|
}
|
|
|
|
//Storage mecanism for caching strings in memory
|
|
type Storage struct {
|
|
items map[string]Item
|
|
mu *sync.RWMutex
|
|
running chan bool
|
|
}
|
|
|
|
//NewStorage creates a new in memory CacheStorage
|
|
func NewStorage() *Storage {
|
|
storage := &Storage{
|
|
items: make(map[string]Item),
|
|
mu: &sync.RWMutex{},
|
|
running: make(chan bool),
|
|
}
|
|
go cleanRoutine(storage)
|
|
return storage
|
|
}
|
|
|
|
func (s Storage) StopRoutine() {
|
|
close(s.running)
|
|
}
|
|
|
|
func (s Storage) Lock() {
|
|
s.mu.Lock()
|
|
}
|
|
|
|
func (s Storage) Unlock() {
|
|
s.mu.Unlock()
|
|
}
|
|
|
|
func (s Storage) List() map[string]Item {
|
|
return s.items
|
|
}
|
|
|
|
//Get a cached content by key
|
|
func (s Storage) Get(key string) []byte {
|
|
item := s.items[key]
|
|
if item.Expired() {
|
|
CacheStorage.Delete(key)
|
|
return nil
|
|
}
|
|
return item.Content
|
|
}
|
|
|
|
func (s Storage) Delete(key string) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
delete(s.items, key)
|
|
}
|
|
|
|
//Set a cached content by key
|
|
func (s Storage) Set(key string, content []byte, duration time.Duration) {
|
|
s.mu.Lock()
|
|
defer s.mu.Unlock()
|
|
s.items[key] = Item{
|
|
Content: content,
|
|
Expiration: utils.Now().Add(duration).UnixNano(),
|
|
}
|
|
}
|