[traffxml] Add traff_storage

Signed-off-by: mvglasow <michael -at- vonglasow.com>

traffxml/traff_storage.cpp

@@ -0,0 +1,76 @@
+#include "traffxml/traff_storage.hpp"
+
+#include "platform/platform.hpp"
+
+#include "coding/internal/file_data.hpp"
+
+#include "base/logging.hpp"
+
+#include <string>
+
+namespace
+{
+std::string GetFilePath(std::string const & fileName) { return GetPlatform().WritablePathForFile(fileName); }
+}  // namespace
+
+namespace traffxml
+{
+// StorageLocal ------------------------------------------------------------------------------------
+bool LocalStorage::Save(pugi::xml_document const & doc)
+{
+  auto const filePath = GetFilePath(m_fileName);
+
+  std::lock_guard<std::mutex> guard(m_mutex);
+
+  return base::WriteToTempAndRenameToFile(filePath, [&doc](std::string const & fileName) {
+    return doc.save_file(fileName.data(), "  " /* indent */);
+  });
+}
+
+bool LocalStorage::Load(pugi::xml_document & doc)
+{
+  auto const filePath = GetFilePath(m_fileName);
+
+  std::lock_guard<std::mutex> guard(m_mutex);
+
+  auto const result = doc.load_file(filePath.c_str());
+  /*
+   * Note: status_file_not_found is ok for our use cases:
+   *  - editor: if a user has never made any edits.
+   *  - traffic: if no traffic information has ever been retrieved (first run)
+   */
+  if (result != pugi::status_ok && result != pugi::status_file_not_found)
+  {
+    LOG(LERROR, ("Can't load file from disk:", filePath));
+    return false;
+  }
+
+  return true;
+}
+
+bool LocalStorage::Reset()
+{
+  std::lock_guard<std::mutex> guard(m_mutex);
+
+  return base::DeleteFileX(GetFilePath(m_fileName));
+}
+
+// StorageMemory -----------------------------------------------------------------------------------
+bool InMemoryStorage::Save(pugi::xml_document const & doc)
+{
+  m_doc.reset(doc);
+  return true;
+}
+
+bool InMemoryStorage::Load(pugi::xml_document & doc)
+{
+  doc.reset(m_doc);
+  return true;
+}
+
+bool InMemoryStorage::Reset()
+{
+  m_doc.reset();
+  return true;
+}
+}  // namespace traffxml