[#253] Caches refactoring

Signed-off-by: Denis Kirillov <denis@nspcc.ru>

api/cache/accessbox.go

@@ -0,0 +1,61 @@
+package cache
+
+import (
+	"time"
+
+	"github.com/bluele/gcache"
+	"github.com/nspcc-dev/neofs-api-go/pkg/object"
+	"github.com/nspcc-dev/neofs-s3-gw/creds/accessbox"
+)
+
+type (
+	// AccessBoxCache stores access box by its address.
+	AccessBoxCache struct {
+		cache gcache.Cache
+	}
+
+	// Config stores expiration params for cache.
+	Config struct {
+		Size     int
+		Lifetime time.Duration
+	}
+)
+
+const (
+	// DefaultAccessBoxCacheSize is a default maximum number of entries in cache.
+	DefaultAccessBoxCacheSize = 100
+	// DefaultAccessBoxCacheLifetime is a default lifetime of entries in  cache.
+	DefaultAccessBoxCacheLifetime = 10 * time.Minute
+)
+
+// DefaultAccessBoxConfig return new default cache expiration values.
+func DefaultAccessBoxConfig() *Config {
+	return &Config{Size: DefaultAccessBoxCacheSize, Lifetime: DefaultAccessBoxCacheLifetime}
+}
+
+// NewAccessBoxCache creates an object of BucketCache.
+func NewAccessBoxCache(config *Config) *AccessBoxCache {
+	gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
+
+	return &AccessBoxCache{cache: gc}
+}
+
+// Get returns cached object.
+func (o *AccessBoxCache) Get(address *object.Address) *accessbox.Box {
+	entry, err := o.cache.Get(address.String())
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*accessbox.Box)
+	if !ok {
+		return nil
+	}
+
+	return result
+}
+
+// Put stores an object to cache.
+func (o *AccessBoxCache) Put(address *object.Address, box *accessbox.Box) error {
+	return o.cache.Set(address.String(), box)
+}