124 lines
2.1 KiB
Go
124 lines
2.1 KiB
Go
package handlers
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import (
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"github.com/statping/statping/utils"
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"net/url"
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"sync"
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"time"
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)
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var CacheStorage Cacher
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type Cacher interface {
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Get(key string) []byte
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Delete(key string)
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Set(key string, content []byte, duration time.Duration)
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List() map[string]Item
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Lock()
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Unlock()
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StopRoutine()
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}
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// Item is a cached reference
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type Item struct {
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Content []byte
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Expiration int64
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}
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// cleanRoutine is a go routine to automatically remove expired caches that haven't been hit recently
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func cleanRoutine(s *Storage) {
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duration := 60 * time.Second
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CacheRoutine:
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for {
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select {
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case <-s.running:
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break CacheRoutine
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case <-time.After(duration):
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for k, v := range s.List() {
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if v.Expired() {
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s.Delete(k)
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}
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}
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duration = 60 * time.Second
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}
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}
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}
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// Expired returns true if the item has expired.
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func (item Item) Expired() bool {
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if item.Expiration == 0 {
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return false
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}
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return utils.Now().UnixNano() > item.Expiration
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}
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//Storage mecanism for caching strings in memory
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type Storage struct {
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items map[string]Item
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mu *sync.RWMutex
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running chan bool
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}
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//NewStorage creates a new in memory CacheStorage
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func NewStorage() *Storage {
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storage := &Storage{
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items: make(map[string]Item),
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mu: &sync.RWMutex{},
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running: make(chan bool),
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}
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go cleanRoutine(storage)
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return storage
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}
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func (s Storage) StopRoutine() {
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close(s.running)
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}
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func (s Storage) Lock() {
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s.mu.Lock()
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}
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func (s Storage) Unlock() {
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s.mu.Unlock()
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}
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func (s Storage) List() map[string]Item {
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return s.items
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}
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//Get a cached content by key
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func (s Storage) Get(key string) []byte {
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s.mu.Lock()
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defer s.mu.Unlock()
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item := s.items[key]
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if item.Expired() {
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CacheStorage.Delete(key)
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return nil
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}
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return item.Content
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}
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func (s Storage) Delete(key string) {
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s.mu.Lock()
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defer s.mu.Unlock()
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delete(s.items, key)
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}
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//Set a cached content by key
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func (s Storage) Set(key string, content []byte, duration time.Duration) {
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s.mu.Lock()
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defer s.mu.Unlock()
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u, err := url.Parse(key)
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if err != nil {
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return
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}
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if u.Query().Get("v") != "" {
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return
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}
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s.items[key] = Item{
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Content: content,
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Expiration: utils.Now().Add(duration).UnixNano(),
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}
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}
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