SERVER-69528 Link cluster count command into mongod

2 files changed, 68 insertions, 0 deletions

diff --git a/src/mongo/db/s/SConscript b/src/mongo/db/s/SConscript
index a437bc2579c..da2bc3faf03 100644
--- a/src/mongo/db/s/SConscript
+++ b/src/mongo/db/s/SConscript
@@ -360,6 +360,7 @@ env.Library(
         'clone_catalog_data_command.cpp',
         'cluster_abort_transaction_cmd_d.cpp',
         'cluster_commit_transaction_cmd_d.cpp',
+        'cluster_count_cmd_d.cpp',
         'cluster_find_cmd_d.cpp',
         'cluster_getmore_cmd_d.cpp',
         'cluster_pipeline_cmd_d.cpp',
@@ -517,6 +518,7 @@ env.Library(
         '$BUILD_DIR/mongo/s/commands/sharded_cluster_sharding_commands',
         '$BUILD_DIR/mongo/s/sharding_initialization',
         '$BUILD_DIR/mongo/s/sharding_router_api',
+        '$BUILD_DIR/mongo/s/startup_initialization',
         'forwardable_operation_metadata',
         'sharding_logging',
         'sharding_runtime_d',
diff --git a/src/mongo/db/s/cluster_count_cmd_d.cpp b/src/mongo/db/s/cluster_count_cmd_d.cpp
new file mode 100644
index 00000000000..e291ec2ee29
--- /dev/null
+++ b/src/mongo/db/s/cluster_count_cmd_d.cpp
@@ -0,0 +1,66 @@
+/**
+ *    Copyright (C) 2022-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.
+ */
+
+#include "mongo/db/s/sharding_state.h"
+#include "mongo/s/commands/cluster_count_cmd.h"
+#include "mongo/s/grid.h"
+
+namespace mongo {
+namespace {
+
+/**
+ * Implements the cluster count command on mongod.
+ */
+struct ClusterCountCmdD {
+    static constexpr StringData kName = "clusterCount"_sd;
+
+    static const std::set<std::string>& getApiVersions() {
+        return kNoApiVersions;
+    }
+
+    static void addRequiredPrivileges(const std::string& dbname,
+                                      const BSONObj& cmdObj,
+                                      std::vector<Privilege>* out) {
+        ActionSet actions;
+        actions.addAction(ActionType::internal);
+        out->push_back(Privilege(ResourcePattern::forClusterResource(), actions));
+    }
+
+    static void checkCanRunHere(OperationContext* opCtx) {
+        Grid::get(opCtx)->assertShardingIsInitialized();
+
+        // A cluster command on the config server may attempt to use a ShardLocal to target itself,
+        // which triggers an invariant, so only shard servers can run this.
+        uassertStatusOK(ShardingState::get(opCtx)->canAcceptShardedCommands());
+    }
+};
+ClusterCountCmdBase<ClusterCountCmdD> clusterCountCmdD;
+
+}  // namespace
+}  // namespace mongo