121 lines
2.8 KiB
Go
121 lines
2.8 KiB
Go
package cache
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import (
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"errors"
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"time"
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"github.com/bluele/gcache"
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"github.com/prometheus/client_golang/prometheus"
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log "github.com/sirupsen/logrus"
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"github.com/crowdsecurity/crowdsec/pkg/types"
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)
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var Caches []gcache.Cache
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var CacheNames []string
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var CacheConfig []CacheCfg
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/*prometheus*/
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var CacheMetrics = prometheus.NewGaugeVec(
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prometheus.GaugeOpts{
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Name: "cs_cache_size",
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Help: "Entries per cache.",
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},
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[]string{"name", "type"},
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)
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// UpdateCacheMetrics is called directly by the prom handler
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func UpdateCacheMetrics() {
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CacheMetrics.Reset()
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for i, name := range CacheNames {
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CacheMetrics.With(prometheus.Labels{"name": name, "type": CacheConfig[i].Strategy}).Set(float64(Caches[i].Len(false)))
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}
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}
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type CacheCfg struct {
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Name string
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Size int
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TTL time.Duration
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Strategy string
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LogLevel *log.Level
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Logger *log.Entry
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}
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func CacheInit(cfg CacheCfg) error {
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for _, name := range CacheNames {
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if name == cfg.Name {
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log.Infof("Cache %s already exists", cfg.Name)
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}
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}
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//get a default logger
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if cfg.LogLevel == nil {
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cfg.LogLevel = new(log.Level)
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*cfg.LogLevel = log.InfoLevel
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}
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var clog = log.New()
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if err := types.ConfigureLogger(clog); err != nil {
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log.Fatalf("While creating cache logger : %s", err)
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}
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clog.SetLevel(*cfg.LogLevel)
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cfg.Logger = clog.WithFields(log.Fields{
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"cache": cfg.Name,
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})
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tmpCache := gcache.New(cfg.Size)
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switch cfg.Strategy {
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case "LRU":
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tmpCache = tmpCache.LRU()
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case "LFU":
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tmpCache = tmpCache.LFU()
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case "ARC":
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tmpCache = tmpCache.ARC()
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default:
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cfg.Strategy = "LRU"
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tmpCache = tmpCache.LRU()
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}
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CTICache := tmpCache.Build()
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Caches = append(Caches, CTICache)
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CacheNames = append(CacheNames, cfg.Name)
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CacheConfig = append(CacheConfig, cfg)
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return nil
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}
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func SetKey(cacheName string, key string, value string, expiration *time.Duration) error {
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for i, name := range CacheNames {
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if name == cacheName {
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if expiration == nil {
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expiration = &CacheConfig[i].TTL
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}
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CacheConfig[i].Logger.Debugf("Setting key %s to %s with expiration %v", key, value, *expiration)
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if err := Caches[i].SetWithExpire(key, value, *expiration); err != nil {
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CacheConfig[i].Logger.Warningf("While setting key %s in cache %s: %s", key, cacheName, err)
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}
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}
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}
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return nil
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}
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func GetKey(cacheName string, key string) (string, error) {
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for i, name := range CacheNames {
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if name == cacheName {
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if value, err := Caches[i].Get(key); err != nil {
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//do not warn or log if key not found
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if errors.Is(err, gcache.KeyNotFoundError) {
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return "", nil
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}
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CacheConfig[i].Logger.Warningf("While getting key %s in cache %s: %s", key, cacheName, err)
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return "", err
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} else {
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return value.(string), nil
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}
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}
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}
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log.Warningf("Cache %s not found", cacheName)
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return "", nil
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}
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