SERVER-52812 Unify the implicit createDatabase/enableSharding flow

This change makes both enableSharding and the implicit createDatabase
from the routers to go through the same _configsvrCreateDatabase
command. This command has the sole responsibility now of creating (or
ensuring it is created) a database with the specified name, optional
primary flag and optional enableSharding field.

1 files changed, 48 insertions, 0 deletions

diff --git a/src/mongo/s/cluster_write.h b/src/mongo/s/cluster_write.h
new file mode 100644
index 00000000000..66333aefe9b
--- /dev/null
+++ b/src/mongo/s/cluster_write.h
@@ -0,0 +1,48 @@
+/**
+ *    Copyright (C) 2018-present MongoDB, Inc.
+ *
+ *    This program is free software: you can redistribute it and/or modify
+ *    it under the terms of the Server Side Public License, version 1,
+ *    as published by MongoDB, Inc.
+ *
+ *    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
+ *    Server Side Public License for more details.
+ *
+ *    You should have received a copy of the Server Side Public License
+ *    along with this program. If not, see
+ *    <http://www.mongodb.com/licensing/server-side-public-license>.
+ *
+ *    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 Server Side 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.
+ */
+
+#pragma once
+
+#include "mongo/s/write_ops/batch_write_exec.h"
+
+namespace mongo {
+namespace cluster {
+
+/**
+ * If 'targetEpoch' is set, throws a 'StaleEpoch' error if the targeted namespace is found to no
+ * longer have the epoch given by 'targetEpoch'.
+ */
+void write(OperationContext* opCtx,
+           const BatchedCommandRequest& request,
+           BatchWriteExecStats* stats,
+           BatchedCommandResponse* response,
+           boost::optional<OID> targetEpoch = boost::none);
+
+}  // namespace cluster
+}  // namespace mongo