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#pragma once
#include <Storages/CheckResults.h>
#include <map>
#include <base/types.h>
namespace Poco { class Logger; }
namespace DB
{
class IDisk;
using DiskPtr = std::shared_ptr<IDisk>;
/// Stores the sizes of all columns, and can check whether the columns are corrupted.
class FileChecker
{
public:
FileChecker(const String & file_info_path_);
FileChecker(DiskPtr disk_, const String & file_info_path_);
void setPath(const String & file_info_path_);
String getPath() const;
void update(const String & full_file_path);
void setEmpty(const String & full_file_path);
void save() const;
bool empty() const { return map.empty(); }
/// Check the files whose parameters are specified in sizes.json
CheckResults check() const;
/// Truncate files that have excessive size to the expected size.
/// Throw exception if the file size is less than expected.
/// The purpose of this function is to rollback a group of unfinished writes.
void repair();
/// Returns stored file size.
size_t getFileSize(const String & full_file_path) const;
/// Returns total size of all files.
size_t getTotalSize() const;
private:
void load();
bool fileReallyExists(const String & path_) const;
size_t getRealFileSize(const String & path_) const;
const DiskPtr disk;
const Poco::Logger * log;
String files_info_path;
std::map<String, size_t> map;
};
}
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