New cpp folder structure

Signed-off-by: Alexander Borsuk <me@alex.bio>

libs/storage/downloading_policy.hpp

@@ -0,0 +1,44 @@
+#pragma once
+
+#include "storage/storage_defines.hpp"
+
+#include "base/deferred_task.hpp"
+
+#include <chrono>
+#include <cstddef>
+#include <utility>
+
+class DownloadingPolicy
+{
+public:
+  using TProcessFunc = std::function<void(storage::CountriesSet const &)>;
+  virtual ~DownloadingPolicy() = default;
+  virtual bool IsDownloadingAllowed() { return true; }
+  virtual void ScheduleRetry(storage::CountriesSet const &, TProcessFunc const &) {}
+};
+
+class StorageDownloadingPolicy : public DownloadingPolicy
+{
+  bool m_cellularDownloadEnabled = false;
+  bool m_downloadRetryFailed = false;
+  static size_t constexpr kAutoRetryCounterMax = 3;
+  size_t m_autoRetryCounter = kAutoRetryCounterMax;
+  base::DeferredTask m_autoRetryWorker;
+
+  std::chrono::time_point<std::chrono::steady_clock> m_disableCellularTime;
+
+public:
+  StorageDownloadingPolicy() : m_autoRetryWorker(std::chrono::seconds(20)) {}
+  void EnableCellularDownload(bool enabled);
+  bool IsCellularDownloadEnabled();
+
+  inline bool IsAutoRetryDownloadFailed() const
+  {
+    return m_downloadRetryFailed || m_autoRetryCounter == 0;
+  }
+
+  // DownloadingPolicy overrides:
+  bool IsDownloadingAllowed() override;
+  void ScheduleRetry(storage::CountriesSet const & failedCountries,
+                     TProcessFunc const & func) override;
+};