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native_cache.go
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native_cache.go
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package main
import (
"fmt"
"sync"
"time"
)
type nativeCache struct {
store map[string]item
freshness time.Duration
expire time.Duration
globalLock sync.Mutex
locks map[string]bool
}
type item struct {
payload []byte
timestamp time.Time
}
func (c *nativeCache) initialize() error {
log.Info("Native cache initialized")
c.store = make(map[string]item)
c.locks = make(map[string]bool)
c.freshness = time.Duration((config.freshness * 1000000000))
c.expire = time.Duration((config.expire * 1000000000))
go c.maintainance()
return nil
}
func (c *nativeCache) get(hash string) (string, string, error) {
var cacheStatus string
item, found := c.store[hash]
if found == false {
return "", "MISS", nil
}
if time.Since(item.timestamp) > c.freshness {
cacheStatus = "STALE"
} else {
cacheStatus = "HIT"
}
return string(item.payload), cacheStatus, nil
}
func (c *nativeCache) set(hash string, body string) error {
var newItem item
c.globalLock.Lock()
defer c.globalLock.Unlock()
newItem.payload = []byte(body)
newItem.timestamp = time.Now()
c.store[hash] = newItem
return nil
}
func (c *nativeCache) lock(hash string) (bool, error) {
locked, found := c.locks[hash]
if found == true {
if locked == true {
return false, nil
}
c.locks[hash] = true
return true, nil
}
c.locks[hash] = true
return true, nil
}
func (c *nativeCache) unlock(hash string) error {
c.locks[hash] = false
return nil
}
func (c *nativeCache) maintainance() {
log.Debug("Native cache maintainance started")
for {
metrics["native.cache.items"].Add(tel, float64(len(c.store)))
var culled float64
for hash := range c.store {
if time.Since(c.store[hash].timestamp) > c.expire {
delete(c.store, hash)
delete(c.locks, hash)
culled++
metrics["native.cache.culls"].Add(tel, culled)
log.Debug(fmt.Sprintf("%s CULL", hash))
}
}
time.Sleep((1 * time.Second))
}
}