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

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package cache
import (
"fmt"
"time"
"git.frostfs.info/TrueCloudLab/frostfs-s3-gw/internal/logs"
oid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/object/id"
"github.com/bluele/gcache"
"go.uber.org/zap"
)
// ObjectsNameCache provides lru cache for objects.
// This cache contains mapping nice names to object addresses.
// Key is bucketName+objectName.
type ObjectsNameCache struct {
cache gcache.Cache
logger *zap.Logger
}
const (
// DefaultObjectsNameCacheSize is a default maximum number of entries in cache.
DefaultObjectsNameCacheSize = 1e4
// DefaultObjectsNameCacheLifetime is a default lifetime of entries in cache.
DefaultObjectsNameCacheLifetime = time.Minute
)
// DefaultObjectsNameConfig returns new default cache expiration values.
func DefaultObjectsNameConfig(logger *zap.Logger) *Config {
return &Config{
Size: DefaultObjectsNameCacheSize,
Lifetime: DefaultObjectsNameCacheLifetime,
Logger: logger,
}
}
// NewObjectsNameCache creates an object of ObjectsNameCache.
func NewObjectsNameCache(config *Config) *ObjectsNameCache {
gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
return &ObjectsNameCache{cache: gc, logger: config.Logger}
}
// Get returns a cached object. Returns nil if value is missing.
func (o *ObjectsNameCache) Get(key string) *oid.Address {
entry, err := o.cache.Get(key)
if err != nil {
return nil
}
result, ok := entry.(oid.Address)
if !ok {
o.logger.Warn(logs.InvalidCacheEntryType, 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 *ObjectsNameCache) Put(key string, address oid.Address) error {
return o.cache.Set(key, address)
}
// Delete deletes an object from cache.
func (o *ObjectsNameCache) Delete(key string) bool {
return o.cache.Remove(key)
}