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#pragma once
#include <Backups/BackupEntryWithChecksumCalculation.h>
#include <base/defines.h>
#include <mutex>
namespace DB
{
class IDisk;
using DiskPtr = std::shared_ptr<IDisk>;
/// Represents a file prepared to be included in a backup, assuming that until this backup entry is destroyed the file won't be changed.
class BackupEntryFromImmutableFile : public BackupEntryWithChecksumCalculation<IBackupEntry>
{
public:
/// The constructor is allowed to not set `file_size_` or `checksum_`, in that case it will be calculated from the data.
BackupEntryFromImmutableFile(
const DiskPtr & disk_,
const String & file_path_,
bool copy_encrypted_ = false,
const std::optional<UInt64> & file_size_ = {},
const std::optional<UInt128> & checksum_ = {});
~BackupEntryFromImmutableFile() override;
std::unique_ptr<SeekableReadBuffer> getReadBuffer(const ReadSettings & read_settings) const override;
UInt64 getSize() const override;
UInt128 getChecksum(const ReadSettings & read_settings) const override;
std::optional<UInt128> getPartialChecksum(size_t prefix_length, const ReadSettings & read_settings) const override;
DataSourceDescription getDataSourceDescription() const override { return data_source_description; }
bool isEncryptedByDisk() const override { return copy_encrypted; }
bool isFromFile() const override { return true; }
bool isFromImmutableFile() const override { return true; }
DiskPtr getDisk() const override { return disk; }
String getFilePath() const override { return file_path; }
private:
const DiskPtr disk;
const String file_path;
const DataSourceDescription data_source_description;
const bool copy_encrypted;
mutable std::optional<UInt64> file_size;
mutable std::optional<UInt128> checksum;
mutable bool file_size_adjusted = false;
mutable bool checksum_adjusted = false;
mutable std::mutex size_and_checksum_mutex;
};
}
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