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diff --git a/src/mongo/rpc/legacy_reply.cpp b/src/mongo/rpc/legacy_reply.cpp
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+++ b/src/mongo/rpc/legacy_reply.cpp
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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/legacy_reply.h"
+
+#include <utility>
+
+#include "mongo/util/assert_util.h"
+#include "mongo/util/mongoutils/str.h"
+
+namespace mongo {
+namespace rpc {
+
+    LegacyReply::LegacyReply(const Message* message)
+        : _message(std::move(message)) {
+        invariant(message->operation() == opReply);
+
+        QueryResult::View qr = _message->singleData().view2ptr();
+
+        // should be checked by caller.
+        invariant(qr.msgdata().getOperation() == opReply);
+
+        uassert(ErrorCodes::BadValue,
+                str::stream() << "Got legacy command reply with a bad cursorId field,"
+                              << " expected a value of 0 but got " << qr.getCursorId(),
+                qr.getCursorId() == 0);
+
+        uassert(ErrorCodes::BadValue,
+                str::stream() << "Got legacy command reply with a bad nReturned field,"
+                              << " expected a value of 1 but got " << qr.getNReturned(),
+                qr.getNReturned() == 1);
+
+        uassert(ErrorCodes::BadValue,
+                str::stream() << "Got legacy command reply with a bad startingFrom field,"
+                              << " expected a value of 0 but got " << qr.getStartingFrom(),
+                qr.getStartingFrom() == 0);
+        // TODO bson validation
+        _commandReply = BSONObj(qr.data());
+    }
+
+    const BSONObj& LegacyReply::getMetadata() const {
+        return _metadataPlaceholder;
+    }
+
+    const BSONObj& LegacyReply::getCommandReply() const {
+        return _commandReply;
+    }
+
+    DocumentRange LegacyReply::getOutputDocs() const {
+        // return empty range
+        return DocumentRange{};
+    }
+
+}  // namespace rpc
+}  // namespace mongo