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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/platform/basic.h"
#include "mongo/db/query/ce/stats_cache_loader_impl.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/query/ce/collection_statistics.h"
#include "mongo/logv2/log.h"
#include "mongo/stdx/thread.h"
namespace mongo {
SemiFuture<CollectionStatistics> StatsCacheLoaderImpl::getStats(OperationContext* opCtx,
const NamespaceString& nss) {
std::string statsColl(kStatsPrefix + "." + nss.ns());
NamespaceString statsNss(kStatsDb, statsColl);
DBDirectClient client(opCtx);
FindCommandRequest findRequest{statsNss};
BSONObj result;
try {
auto cursor = client.find(findRequest);
if (!cursor) {
uasserted(ErrorCodes::OperationFailed,
str::stream() << "Failed to establish a cursor for reading " << nss.ns()
<< " from local storage");
}
std::vector<BSONObj> histograms;
while (cursor->more()) {
BSONObj document = cursor->nextSafe().getOwned();
histograms.push_back(std::move(document));
}
// TODO: SERVER-68745, parse histograms BSONs.
CollectionStatistics stats{0};
return makeReadyFutureWith([this, stats] { return stats; }).semi();
} catch (const DBException& ex) {
uassertStatusOK(ex.toStatus());
}
MONGO_UNREACHABLE
}
} // namespace mongo
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