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/**
* Copyright (C) 2022-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.
*/
#include "mongo/s/query_analysis_sampler_util.h"
#include "mongo/platform/random.h"
#include "mongo/s/analyze_shard_key_role.h"
#include "mongo/s/query_analysis_sampler.h"
#include "mongo/util/static_immortal.h"
#include "mongo/util/synchronized_value.h"
namespace mongo {
namespace analyze_shard_key {
namespace {
constexpr auto kSampleIdFieldName = "sampleId"_sd;
template <typename C>
auto sampleIter(C&& c) {
static StaticImmortal<synchronized_value<PseudoRandom>> random{
PseudoRandom{SecureRandom().nextInt64()}};
return std::next(c.begin(), (*random)->nextInt64(c.size()));
}
} // namespace
boost::optional<UUID> tryGenerateSampleId(OperationContext* opCtx, const NamespaceString& nss) {
return supportsSamplingQueries() ? QueryAnalysisSampler::get(opCtx).tryGenerateSampleId(nss)
: boost::none;
}
boost::optional<TargetedSampleId> tryGenerateTargetedSampleId(OperationContext* opCtx,
const NamespaceString& nss,
const std::set<ShardId>& shardIds) {
if (auto sampleId = tryGenerateSampleId(opCtx, nss)) {
return TargetedSampleId{*sampleId, getRandomShardId(shardIds)};
}
return boost::none;
}
boost::optional<TargetedSampleId> tryGenerateTargetedSampleId(
OperationContext* opCtx,
const NamespaceString& nss,
const std::vector<ShardEndpoint>& endpoints) {
if (auto sampleId = tryGenerateSampleId(opCtx, nss)) {
return TargetedSampleId{*sampleId, getRandomShardId(endpoints)};
}
return boost::none;
}
ShardId getRandomShardId(const std::set<ShardId>& shardIds) {
return *sampleIter(shardIds);
}
ShardId getRandomShardId(const std::vector<ShardEndpoint>& endpoints) {
return sampleIter(endpoints)->shardName;
}
BSONObj appendSampleId(const BSONObj& cmdObj, const UUID& sampleId) {
BSONObjBuilder bob(std::move(cmdObj));
appendSampleId(&bob, sampleId);
return bob.obj();
}
void appendSampleId(BSONObjBuilder* bob, const UUID& sampleId) {
sampleId.appendToBuilder(bob, kSampleIdFieldName);
}
} // namespace analyze_shard_key
} // namespace mongo
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