/**
 *    Copyright (C) 2018 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.
 */

#define MONGO_LOG_DEFAULT_COMPONENT ::mongo::logger::LogComponent::kWrite

#include "mongo/platform/basic.h"

#include "mongo/db/session_catalog_mongod.h"

#include "mongo/db/catalog_raii.h"
#include "mongo/db/client.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/rpc/get_status_from_command_result.h"

namespace mongo {

void MongoDSessionCatalog::onStepUp(OperationContext* opCtx) {
    SessionCatalog::get(opCtx)->invalidateSessions(opCtx, boost::none);

    const size_t initialExtentSize = 0;
    const bool capped = false;
    const bool maxSize = 0;

    BSONObj result;

    DBDirectClient client(opCtx);

    if (client.createCollection(NamespaceString::kSessionTransactionsTableNamespace.ns(),
                                initialExtentSize,
                                capped,
                                maxSize,
                                &result)) {
        return;
    }

    const auto status = getStatusFromCommandResult(result);

    if (status == ErrorCodes::NamespaceExists) {
        return;
    }

    uassertStatusOKWithContext(status,
                               str::stream()
                                   << "Failed to create the "
                                   << NamespaceString::kSessionTransactionsTableNamespace.ns()
                                   << " collection");
}

boost::optional<UUID> MongoDSessionCatalog::getTransactionTableUUID(OperationContext* opCtx) {
    AutoGetCollection autoColl(opCtx, NamespaceString::kSessionTransactionsTableNamespace, MODE_IS);

    const auto coll = autoColl.getCollection();
    if (!coll) {
        return boost::none;
    }

    return coll->uuid();
}

}  // namespace mongo