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// Copyright 2021 The Gitea Authors. All rights reserved.
// Use of this source code is governed by a MIT-style
// license that can be found in the LICENSE file.
package cache
import (
"strconv"
"sync"
"time"
"code.gitea.io/gitea/modules/json"
mc "gitea.com/go-chi/cache"
lru "github.com/hashicorp/golang-lru"
)
// TwoQueueCache represents a LRU 2Q cache adapter implementation
type TwoQueueCache struct {
lock sync.Mutex
cache *lru.TwoQueueCache
interval int
}
// TwoQueueCacheConfig describes the configuration for TwoQueueCache
type TwoQueueCacheConfig struct {
Size int `ini:"SIZE" json:"size"`
RecentRatio float64 `ini:"RECENT_RATIO" json:"recent_ratio"`
GhostRatio float64 `ini:"GHOST_RATIO" json:"ghost_ratio"`
}
// MemoryItem represents a memory cache item.
type MemoryItem struct {
Val interface{}
Created int64
Timeout int64
}
func (item *MemoryItem) hasExpired() bool {
return item.Timeout > 0 &&
(time.Now().Unix()-item.Created) >= item.Timeout
}
var _ mc.Cache = &TwoQueueCache{}
// Put puts value into cache with key and expire time.
func (c *TwoQueueCache) Put(key string, val interface{}, timeout int64) error {
item := &MemoryItem{
Val: val,
Created: time.Now().Unix(),
Timeout: timeout,
}
c.lock.Lock()
defer c.lock.Unlock()
c.cache.Add(key, item)
return nil
}
// Get gets cached value by given key.
func (c *TwoQueueCache) Get(key string) interface{} {
c.lock.Lock()
defer c.lock.Unlock()
cached, ok := c.cache.Get(key)
if !ok {
return nil
}
item, ok := cached.(*MemoryItem)
if !ok || item.hasExpired() {
c.cache.Remove(key)
return nil
}
return item.Val
}
// Delete deletes cached value by given key.
func (c *TwoQueueCache) Delete(key string) error {
c.lock.Lock()
defer c.lock.Unlock()
c.cache.Remove(key)
return nil
}
// Incr increases cached int-type value by given key as a counter.
func (c *TwoQueueCache) Incr(key string) error {
c.lock.Lock()
defer c.lock.Unlock()
cached, ok := c.cache.Get(key)
if !ok {
return nil
}
item, ok := cached.(*MemoryItem)
if !ok || item.hasExpired() {
c.cache.Remove(key)
return nil
}
var err error
item.Val, err = mc.Incr(item.Val)
return err
}
// Decr decreases cached int-type value by given key as a counter.
func (c *TwoQueueCache) Decr(key string) error {
c.lock.Lock()
defer c.lock.Unlock()
cached, ok := c.cache.Get(key)
if !ok {
return nil
}
item, ok := cached.(*MemoryItem)
if !ok || item.hasExpired() {
c.cache.Remove(key)
return nil
}
var err error
item.Val, err = mc.Decr(item.Val)
return err
}
// IsExist returns true if cached value exists.
func (c *TwoQueueCache) IsExist(key string) bool {
c.lock.Lock()
defer c.lock.Unlock()
cached, ok := c.cache.Peek(key)
if !ok {
return false
}
item, ok := cached.(*MemoryItem)
if !ok || item.hasExpired() {
c.cache.Remove(key)
return false
}
return true
}
// Flush deletes all cached data.
func (c *TwoQueueCache) Flush() error {
c.lock.Lock()
defer c.lock.Unlock()
c.cache.Purge()
return nil
}
func (c *TwoQueueCache) checkAndInvalidate(key interface{}) {
c.lock.Lock()
defer c.lock.Unlock()
cached, ok := c.cache.Peek(key)
if !ok {
return
}
item, ok := cached.(*MemoryItem)
if !ok || item.hasExpired() {
c.cache.Remove(item)
}
}
func (c *TwoQueueCache) startGC() {
if c.interval < 0 {
return
}
for _, key := range c.cache.Keys() {
c.checkAndInvalidate(key)
}
time.AfterFunc(time.Duration(c.interval)*time.Second, c.startGC)
}
// StartAndGC starts GC routine based on config string settings.
func (c *TwoQueueCache) StartAndGC(opts mc.Options) error {
var err error
size := 50000
if opts.AdapterConfig != "" {
size, err = strconv.Atoi(opts.AdapterConfig)
}
if err != nil {
if !json.Valid([]byte(opts.AdapterConfig)) {
return err
}
cfg := &TwoQueueCacheConfig{
Size: 50000,
RecentRatio: lru.Default2QRecentRatio,
GhostRatio: lru.Default2QGhostEntries,
}
_ = json.Unmarshal([]byte(opts.AdapterConfig), cfg)
c.cache, err = lru.New2QParams(cfg.Size, cfg.RecentRatio, cfg.GhostRatio)
} else {
c.cache, err = lru.New2Q(size)
}
c.interval = opts.Interval
if c.interval > 0 {
go c.startGC()
}
return err
}
func init() {
mc.Register("twoqueue", &TwoQueueCache{})
}
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