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-rw-r--r--src/mongo/rpc/metadata.cpp69
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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/rpc/metadata.h"
+
+#include "mongo/client/dbclientinterface.h"
+#include "mongo/db/jsobj.h"
+
+namespace mongo {
+namespace rpc {
+namespace metadata {
+
+ BSONObj empty() {
+ return BSONObj();
+ }
+
+ const char kSecondaryOk[] = "$secondaryOk";
+
+ StatusWith<CommandAndMetadata> upconvertRequest(BSONObj legacyCmdObj, int queryFlags) {
+ BSONObjBuilder metadataBob;
+
+ // note second check may be erroneous: see SERVER-18194
+ if ((queryFlags & QueryOption_SlaveOk)) {
+ metadataBob.append(kSecondaryOk, 1);
+ }
+
+ return std::make_tuple(std::move(legacyCmdObj), std::move(metadataBob.obj()));
+ }
+
+ StatusWith<LegacyCommandAndFlags> downconvertRequest(BSONObj cmdObj, BSONObj metadata) {
+ int flags = 0;
+
+ if (metadata.hasField(kSecondaryOk)) {
+ flags |= QueryOption_SlaveOk;
+ }
+
+ return std::make_tuple(std::move(cmdObj), flags);
+ }
+
+} // namespace metadata
+} // namespace rpc
+} // namespace mongo