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Merge pull request #375 from bakins/lru-cache

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Use groupcache for LRU cache
This commit is contained in:
Matthias Rampke 2021-05-03 17:19:39 +02:00 committed by GitHub
commit 2a6bbd7827
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GPG key ID: 4AEE18F83AFDEB23
3 changed files with 48 additions and 10 deletions
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2
go.mod
View file

@ -2,7 +2,7 @@ module github.com/prometheus/statsd_exporter
require (
github.com/go-kit/kit v0.10.0
github.com/hashicorp/golang-lru v0.5.4
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da
github.com/prometheus/client_golang v1.9.0
github.com/prometheus/client_model v0.2.0
github.com/prometheus/common v0.19.0

4
go.sum
View file

@ -76,6 +76,8 @@ github.com/gogo/protobuf v1.2.1/go.mod h1:hp+jE20tsWTFYpLwKvXlhS1hjn+gTNwPg2I6zV
github.com/golang/glog v0.0.0-20160126235308-23def4e6c14b/go.mod h1:SBH7ygxi8pfUlaOkMMuAQtPIUF8ecWP5IEl/CR7VP2Q=
github.com/golang/groupcache v0.0.0-20160516000752-02826c3e7903/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/groupcache v0.0.0-20190702054246-869f871628b6/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da h1:oI5xCqsCo564l8iNU+DwB5epxmsaqB+rhGL0m5jtYqE=
github.com/golang/groupcache v0.0.0-20210331224755-41bb18bfe9da/go.mod h1:cIg4eruTrX1D+g88fzRXU5OdNfaM+9IcxsU14FzY7Hc=
github.com/golang/mock v1.1.1/go.mod h1:oTYuIxOrZwtPieC+H1uAHpcLFnEyAGVDL/k47Jfbm0A=
github.com/golang/protobuf v1.2.0/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
github.com/golang/protobuf v1.3.1/go.mod h1:6lQm79b+lXiMfvg/cZm0SGofjICqVBUtrP5yJMmIC1U=
@ -123,8 +125,6 @@ github.com/hashicorp/go-version v1.2.0/go.mod h1:fltr4n8CU8Ke44wwGCBoEymUuxUHl09
github.com/hashicorp/go.net v0.0.1/go.mod h1:hjKkEWcCURg++eb33jQU7oqQcI9XDCnUzHA0oac0k90=
github.com/hashicorp/golang-lru v0.5.0/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.1/go.mod h1:/m3WP610KZHVQ1SGc6re/UDhFvYD7pJ4Ao+sR/qLZy8=
github.com/hashicorp/golang-lru v0.5.4 h1:YDjusn29QI/Das2iO9M0BHnIbxPeyuCHsjMW+lJfyTc=
github.com/hashicorp/golang-lru v0.5.4/go.mod h1:iADmTwqILo4mZ8BN3D2Q6+9jd8WM5uGBxy+E8yxSoD4=
github.com/hashicorp/logutils v1.0.0/go.mod h1:QIAnNjmIWmVIIkWDTG1z5v++HQmx9WQRO+LraFDTW64=
github.com/hashicorp/mdns v1.0.0/go.mod h1:tL+uN++7HEJ6SQLQ2/p+z2pH24WQKWjBPkE0mNTz8vQ=
github.com/hashicorp/memberlist v0.1.3/go.mod h1:ajVTdAv/9Im8oMAAj5G31PhhMCZJV2pPBoIllUwCN7I=

52
pkg/mappercache/lru/lru.go
View file

@ -14,15 +14,17 @@
package lru
import (
"sync"
"github.com/prometheus/client_golang/prometheus"
lru2 "github.com/hashicorp/golang-lru"
"github.com/golang/groupcache/lru"
"github.com/prometheus/statsd_exporter/pkg/mappercache"
)
type metricMapperLRUCache struct {
cache *lru2.Cache
cache *lruCache
metrics *mappercache.CacheMetrics
}
@ -32,10 +34,7 @@ func NewMetricMapperLRUCache(reg prometheus.Registerer, size int) (*metricMapper
}
metrics := mappercache.NewCacheMetrics(reg)
cache, err := lru2.New(size)
if err != nil {
return &metricMapperLRUCache{}, err
}
cache := newLruCache(size)
return &metricMapperLRUCache{metrics: metrics, cache: cache}, nil
}
@ -60,6 +59,45 @@ func (m *metricMapperLRUCache) trackCacheLength() {
}
func (m *metricMapperLRUCache) Reset() {
m.cache.Purge()
m.cache.Clear()
m.metrics.CacheLength.Set(0)
}
type lruCache struct {
cache *lru.Cache
lock sync.RWMutex
}
func newLruCache(maxEntries int) *lruCache {
return &lruCache{
cache: lru.New(maxEntries),
}
}
func (l *lruCache) Get(key string) (interface{}, bool) {
l.lock.RLock()
defer l.lock.RUnlock()
return l.cache.Get(key)
}
func (l *lruCache) Add(key string, value interface{}) {
l.lock.Lock()
defer l.lock.Unlock()
l.cache.Add(key, value)
}
func (l *lruCache) Len() int {
l.lock.RLock()
defer l.lock.RUnlock()
return l.cache.Len()
}
func (l *lruCache) Clear() {
l.lock.Lock()
defer l.lock.Unlock()
l.cache.Clear()
}