buffet: Parse buffet config and load/save state
State is loaded and saved as black box string.
BUG=brillo:1257,brillo:1253
TEST=`FEATURES=test emerge-gizmo libweave buffet`
Change-Id: I21d2b26cf90a046cdba505ab0f265a29f53f9a2b
Reviewed-on: https://chromium-review.googlesource.com/293917
Tested-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Vitaly Buka <vitalybuka@chromium.org>
Reviewed-by: Alex Vakulenko <avakulenko@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
diff --git a/buffet/buffet_config.h b/buffet/buffet_config.h
new file mode 100644
index 0000000..6deb726
--- /dev/null
+++ b/buffet/buffet_config.h
@@ -0,0 +1,52 @@
+// Copyright 2015 The Chromium OS Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BUFFET_BUFFET_CONFIG_H_
+#define BUFFET_BUFFET_CONFIG_H_
+
+#include <set>
+#include <string>
+#include <vector>
+
+#include <base/callback.h>
+#include <base/files/file_path.h>
+#include <chromeos/key_value_store.h>
+#include <weave/config_store.h>
+
+namespace buffet {
+
+class StorageInterface;
+
+// Handles reading buffet config and state files.
+class BuffetConfig final : public weave::ConfigStore {
+ public:
+ using OnChangedCallback = base::Callback<void(const weave::Settings&)>;
+ ~BuffetConfig() override = default;
+
+ BuffetConfig(const base::FilePath& defaults_path,
+ const base::FilePath& settings_path);
+
+ // Config overrides.
+ bool LoadDefaults(weave::Settings* settings) override;
+ std::string LoadSettings() override;
+ void SaveSettings(const std::string& settings) override;
+ void OnSettingsChanged(const weave::Settings& settings) override;
+
+ void AddOnChangedCallback(const OnChangedCallback& callback);
+
+ bool LoadDefaults(const chromeos::KeyValueStore& store,
+ weave::Settings* settings);
+
+ private:
+ base::FilePath defaults_path_;
+ base::FilePath settings_path_;
+
+ std::vector<OnChangedCallback> on_changed_;
+
+ DISALLOW_COPY_AND_ASSIGN(BuffetConfig);
+};
+
+} // namespace buffet
+
+#endif // BUFFET_BUFFET_CONFIG_H_