// storage_engine.cpp

/**
*    Copyright (C) 2014 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/db/client.h"
#include "mongo/db/commands/server_status.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/storage_engine.h"
#include "mongo/db/storage/storage_options.h"

namespace mongo {

// TODO: Does this belong here?
namespace {

class StorageSSS : public ServerStatusSection {
public:
    StorageSSS() : ServerStatusSection("storageEngine") {}

    virtual ~StorageSSS() {}

    virtual bool includeByDefault() const {
        return true;
    }

    virtual BSONObj generateSection(OperationContext* txn, const BSONElement& configElement) const {
        auto engine = txn->getClient()->getServiceContext()->getGlobalStorageEngine();
        return BSON("name" << storageGlobalParams.engine << "supportsCommittedReads"
                           << bool(engine->getSnapshotManager())
                           << "readOnly"
                           << storageGlobalParams.readOnly
                           << "persistent"
                           << !engine->isEphemeral());
    }

} storageSSS;

}  // namespace
}  // namespace mongo
