SERVER-69708 Detect a write without a shard key or _id

1 files changed, 55 insertions, 0 deletions

diff --git a/src/mongo/s/write_ops/write_without_shard_key_util.cpp b/src/mongo/s/write_ops/write_without_shard_key_util.cpp
new file mode 100644
index 00000000000..820a813c399
--- /dev/null
+++ b/src/mongo/s/write_ops/write_without_shard_key_util.cpp
@@ -0,0 +1,55 @@
+/**
+ *    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/bson/bsonobj.h"
+#include "mongo/logv2/log.h"
+#include "mongo/s/catalog_cache.h"
+#include "mongo/s/grid.h"
+
+#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
+
+namespace mongo {
+namespace write_without_shard_key {
+
+bool canTargetQueryByShardKeyOrId(OperationContext* opCtx,
+                                  NamespaceString ns,
+                                  const BSONObj& query) {
+    auto cm =
+        uassertStatusOK(Grid::get(opCtx)->catalogCache()->getCollectionRoutingInfo(opCtx, ns));
+    auto shardKey =
+        uassertStatusOK(cm.getShardKeyPattern().extractShardKeyFromQuery(opCtx, ns, query));
+
+    if (shardKey.isEmpty() && !query.hasField("_id")) {
+        LOGV2(6970800, "A write without shard key or _id detected");
+        return false;
+    }
+    return true;
+}
+}  // namespace write_without_shard_key
+}  // namespace mongo