frostfs-s3-gw/api/cache/buckets.go

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package cache
import (
"fmt"
"time"
"github.com/bluele/gcache"
"github.com/nspcc-dev/neofs-s3-gw/api/data"
"go.uber.org/zap"
)
// BucketCache contains cache with objects and the lifetime of cache entries.
type BucketCache struct {
cache gcache.Cache
logger *zap.Logger
}
const (
// DefaultBucketCacheSize is a default maximum number of entries in cache.
DefaultBucketCacheSize = 1e3
// DefaultBucketCacheLifetime is a default lifetime of entries in cache.
DefaultBucketCacheLifetime = time.Minute
)
// DefaultBucketConfig returns new default cache expiration values.
func DefaultBucketConfig(logger *zap.Logger) *Config {
return &Config{
Size: DefaultBucketCacheSize,
Lifetime: DefaultBucketCacheLifetime,
Logger: logger,
}
}
// NewBucketCache creates an object of BucketCache.
func NewBucketCache(config *Config) *BucketCache {
gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
return &BucketCache{cache: gc, logger: config.Logger}
}
// Get returns a cached object.
func (o *BucketCache) Get(key string) *data.BucketInfo {
entry, err := o.cache.Get(key)
if err != nil {
return nil
}
result, ok := entry.(*data.BucketInfo)
if !ok {
o.logger.Warn("invalid cache entry type", zap.String("actual", fmt.Sprintf("%T", entry)),
zap.String("expected", fmt.Sprintf("%T", result)))
return nil
}
return result
}
// Put puts an object to cache.
func (o *BucketCache) Put(bkt *data.BucketInfo) error {
return o.cache.Set(bkt.Name, bkt)
}
// Delete deletes an object from cache.
func (o *BucketCache) Delete(key string) bool {
return o.cache.Remove(key)
}