diff options
Diffstat (limited to 'src/mongo/db/command_can_run_here.cpp')
-rw-r--r-- | src/mongo/db/command_can_run_here.cpp | 57 |
1 files changed, 57 insertions, 0 deletions
diff --git a/src/mongo/db/command_can_run_here.cpp b/src/mongo/db/command_can_run_here.cpp new file mode 100644 index 00000000000..c945380cc3e --- /dev/null +++ b/src/mongo/db/command_can_run_here.cpp @@ -0,0 +1,57 @@ +/** + * 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. + */ + +#include "mongo/platform/basic.h" + +#include "mongo/db/command_can_run_here.h" + +#include "mongo/db/repl/replication_coordinator.h" +#include "mongo/client/read_preference.h" +#include "mongo/util/assert_util.h" + +namespace mongo { + +bool commandCanRunHere(OperationContext* opCtx, const std::string& dbname, const Command* command) { + auto replCoord = repl::ReplicationCoordinator::get(opCtx); + if (replCoord->canAcceptWritesForDatabase_UNSAFE(opCtx, dbname)) + return true; // primary: always ok + if (!opCtx->writesAreReplicated()) + return true; // standalone: always ok + switch (command->secondaryAllowed()) { + case Command::AllowedOnSecondary::kAlways: + return true; + case Command::AllowedOnSecondary::kNever: + return false; + case Command::AllowedOnSecondary::kOptIn: + // Did the user opt in? + return ReadPreferenceSetting::get(opCtx).canRunOnSecondary(); + } + MONGO_UNREACHABLE; +} + +} // namespace mongo |