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/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#pragma once
#include <boost/optional.hpp>
#include "mongo/bson/bsonobj.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/timeseries/timeseries_gen.h"
namespace mongo {
namespace timeseries {
/**
* Returns a compressed timeseries bucket in v2 format for a given uncompressed v1 bucket and time
* field. The compressed bucket will have all measurements sorted by time. If
* 'validateDecompression' is set to true we will validate that the bucket can be fully decompressed
* without any data loss.
*/
struct CompressionResult {
// The compressed bucket, boost::none if compression failed for any reason.
boost::optional<BSONObj> compressedBucket;
// How many times, in excess of one, subobject compression was started when compressing buckets.
// Useful for statistics.
int numInterleavedRestarts = 0;
// Indicator if compression failed because we could not decompress without data loss.
bool decompressionFailed = false;
};
CompressionResult compressBucket(const BSONObj& bucketDoc,
StringData timeFieldName,
const NamespaceString& nss,
bool eligibleForReopening,
bool validateDecompression);
boost::optional<BSONObj> decompressBucket(const BSONObj& bucketDoc);
/**
* Returns whether a timeseries bucket has been compressed to the v2 format.
*/
bool isCompressedBucket(const BSONObj& bucketDoc);
} // namespace timeseries
} // namespace mongo
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