refactor(storage): refactoring storage (#1459)

Signed-off-by: Laurentiu Niculae <niculae.laurentiu1@gmail.com>

pkg/storage/cache.go

@@ -2,10 +2,58 @@ package storage
 
 import (
 	"zotregistry.io/zot/errors"
+	"zotregistry.io/zot/pkg/api/config"
 	zlog "zotregistry.io/zot/pkg/log"
 	"zotregistry.io/zot/pkg/storage/cache"
+	"zotregistry.io/zot/pkg/storage/constants"
 )
 
+func CreateCacheDatabaseDriver(storageConfig config.StorageConfig, log zlog.Logger) cache.Cache {
+	if !storageConfig.Dedupe && storageConfig.StorageDriver == nil {
+		return nil
+	}
+
+	// local cache
+	if !storageConfig.RemoteCache {
+		params := cache.BoltDBDriverParameters{}
+		params.RootDir = storageConfig.RootDirectory
+		params.Name = constants.BoltdbName
+		params.UseRelPaths = getUseRelPaths(&storageConfig)
+
+		driver, _ := Create("boltdb", params, log)
+
+		return driver
+	}
+
+	// remote cache
+	if storageConfig.CacheDriver != nil {
+		name, ok := storageConfig.CacheDriver["name"].(string)
+		if !ok {
+			log.Warn().Msg("remote cache driver name missing!")
+
+			return nil
+		}
+
+		if name != constants.DynamoDBDriverName {
+			log.Warn().Str("driver", name).Msg("remote cache driver unsupported!")
+
+			return nil
+		}
+
+		// dynamodb
+		dynamoParams := cache.DynamoDBDriverParameters{}
+		dynamoParams.Endpoint, _ = storageConfig.CacheDriver["endpoint"].(string)
+		dynamoParams.Region, _ = storageConfig.CacheDriver["region"].(string)
+		dynamoParams.TableName, _ = storageConfig.CacheDriver["cachetablename"].(string)
+
+		driver, _ := Create("dynamodb", dynamoParams, log)
+
+		return driver
+	}
+
+	return nil
+}
+
 func Create(dbtype string, parameters interface{}, log zlog.Logger) (cache.Cache, error) {
 	switch dbtype {
 	case "boltdb":
@@ -22,3 +70,7 @@ func Create(dbtype string, parameters interface{}, log zlog.Logger) (cache.Cache
 		}
 	}
 }
+
+func getUseRelPaths(storageConfig *config.StorageConfig) bool {
+	return storageConfig.StorageDriver == nil
+}