[#212] Support CORS container for CORS settings

Signed-off-by: Marina Biryukova <m.biryukova@yadro.com>

internal/cache/cors.go

@@ -0,0 +1,62 @@
+package cache
+
+import (
+	"fmt"
+	"time"
+
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/data"
+	"git.frostfs.info/TrueCloudLab/frostfs-http-gw/internal/logs"
+	cid "git.frostfs.info/TrueCloudLab/frostfs-sdk-go/container/id"
+	"github.com/bluele/gcache"
+	"go.uber.org/zap"
+)
+
+// CORSCache contains cache with CORS objects.
+type CORSCache struct {
+	cache  gcache.Cache
+	logger *zap.Logger
+}
+
+const (
+	// DefaultCORSCacheSize is a default maximum number of entries in cache.
+	DefaultCORSCacheSize = 1e3
+	// DefaultCORSCacheLifetime is a default lifetime of entries in cache.
+	DefaultCORSCacheLifetime = 5 * time.Minute
+)
+
+// DefaultCORSConfig returns new default cache expiration values.
+func DefaultCORSConfig(logger *zap.Logger) *Config {
+	return &Config{
+		Size:     DefaultCORSCacheSize,
+		Lifetime: DefaultCORSCacheLifetime,
+		Logger:   logger,
+	}
+}
+
+// NewCORSCache creates an object of CORSCache.
+func NewCORSCache(config *Config) *CORSCache {
+	gc := gcache.New(config.Size).LRU().Expiration(config.Lifetime).Build()
+	return &CORSCache{cache: gc, logger: config.Logger}
+}
+
+// Get returns a cached object.
+func (o *CORSCache) Get(cnrID cid.ID) *data.CORSConfiguration {
+	entry, err := o.cache.Get(cnrID)
+	if err != nil {
+		return nil
+	}
+
+	result, ok := entry.(*data.CORSConfiguration)
+	if !ok {
+		o.logger.Warn(logs.InvalidCacheEntryType, zap.String("actual", fmt.Sprintf("%T", entry)),
+			zap.String("expected", fmt.Sprintf("%T", result)), logs.TagField(logs.TagDatapath))
+		return nil
+	}
+
+	return result
+}
+
+// Put puts an object to cache.
+func (o *CORSCache) Put(cnrID cid.ID, cors *data.CORSConfiguration) error {
+	return o.cache.Set(cnrID, cors)
+}