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#include <Backups/BackupEntryFromAppendOnlyFile.h>
#include <Disks/IDisk.h>
#include <IO/LimitSeekableReadBuffer.h>
#include <IO/ReadBufferFromFileBase.h>
namespace DB
{
namespace
{
/// For append-only files we must calculate its size on the construction of a backup entry.
UInt64 calculateSize(const DiskPtr & disk, const String & file_path, bool copy_encrypted, std::optional<UInt64> unencrypted_file_size)
{
if (!unencrypted_file_size)
return copy_encrypted ? disk->getEncryptedFileSize(file_path) : disk->getFileSize(file_path);
else if (copy_encrypted)
return disk->getEncryptedFileSize(*unencrypted_file_size);
else
return *unencrypted_file_size;
}
}
BackupEntryFromAppendOnlyFile::BackupEntryFromAppendOnlyFile(
const DiskPtr & disk_, const String & file_path_, bool copy_encrypted_, const std::optional<UInt64> & file_size_)
: disk(disk_)
, file_path(file_path_)
, data_source_description(disk->getDataSourceDescription())
, copy_encrypted(copy_encrypted_ && data_source_description.is_encrypted)
, size(calculateSize(disk_, file_path_, copy_encrypted, file_size_))
{
}
BackupEntryFromAppendOnlyFile::~BackupEntryFromAppendOnlyFile() = default;
std::unique_ptr<SeekableReadBuffer> BackupEntryFromAppendOnlyFile::getReadBuffer(const ReadSettings & read_settings) const
{
std::unique_ptr<SeekableReadBuffer> buf;
if (copy_encrypted)
buf = disk->readEncryptedFile(file_path, read_settings.adjustBufferSize(size));
else
buf = disk->readFile(file_path, read_settings.adjustBufferSize(size));
return std::make_unique<LimitSeekableReadBuffer>(std::move(buf), 0, size);
}
}
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