first commit

provider/ns/provider.go

@@ -0,0 +1,22 @@
+package ns
+
+import (
+	"context"
+	"errors"
+
+	"gitoa.ru/go-4devs/cache"
+)
+
+var ErrProviderNotFound = errors.New("provider not found")
+
+func New(providers map[string]cache.Provider) cache.Provider {
+	return func(ctx context.Context, operation string, item *cache.Item) error {
+		if prov, ok := providers[item.Key.Prefix]; ok {
+			item.Key.Prefix = ""
+
+			return prov(ctx, operation, item)
+		}
+
+		return ErrProviderNotFound
+	}
+}