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/**
* Copyright (C) 2015 MongoDB Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License, version 3,
* as published by the Free Software Foundation.
*
* 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
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* 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 GNU Affero General 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/s/shard_util.h"
#include "mongo/base/status_with.h"
#include "mongo/client/read_preference.h"
#include "mongo/client/remote_command_targeter.h"
#include "mongo/s/client/shard_registry.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
namespace shardutil {
StatusWith<long long> retrieveTotalShardSize(OperationContext* txn,
ShardId shardId,
ShardRegistry* shardRegistry) {
auto shard = shardRegistry->getShard(txn, shardId);
if (!shard) {
return {ErrorCodes::ShardNotFound, str::stream() << "shard " << shardId << " not found"};
}
auto shardHostStatus =
shard->getTargeter()->findHost({ReadPreference::PrimaryPreferred, TagSet::primaryOnly()});
if (!shardHostStatus.isOK()) {
return shardHostStatus.getStatus();
}
auto listDatabasesStatus = shardRegistry->runCommand(
txn, shardHostStatus.getValue(), "admin", BSON("listDatabases" << 1));
if (!listDatabasesStatus.isOK()) {
return listDatabasesStatus.getStatus();
}
BSONElement totalSizeElem = listDatabasesStatus.getValue()["totalSize"];
if (!totalSizeElem.isNumber()) {
return {ErrorCodes::NoSuchKey, "totalSize field not found in listDatabases"};
}
return totalSizeElem.numberLong();
}
} // namespace shardutil
} // namespace mongo
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