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/**
* Copyright (C) 2016 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/db/views/view_sharding_check.h"
#include "mongo/db/catalog/database.h"
#include "mongo/db/commands.h"
#include "mongo/db/db_raii.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/replication_coordinator_global.h"
#include "mongo/db/s/collection_sharding_state.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/server_options.h"
#include "mongo/db/views/view_catalog.h"
#include "mongo/s/stale_exception.h"
namespace mongo {
StatusWith<BSONObj> ViewShardingCheck::getResolvedViewIfSharded(OperationContext* opCtx,
Database* db,
const ViewDefinition* view) {
invariant(opCtx);
invariant(db);
invariant(view);
if (ClusterRole::ShardServer != serverGlobalParams.clusterRole) {
// This node is not part of a sharded cluster, so the collection cannot be sharded.
return BSONObj();
}
auto resolvedView = db->getViewCatalog()->resolveView(opCtx, view->name());
if (!resolvedView.isOK()) {
return resolvedView.getStatus();
}
const auto& sourceNss = resolvedView.getValue().getNamespace();
const auto isPrimary =
repl::ReplicationCoordinator::get(opCtx->getClient()->getServiceContext())
->canAcceptWritesForDatabase(db->name());
if (isPrimary && !collectionIsSharded(opCtx, sourceNss)) {
return BSONObj();
}
BSONObjBuilder viewDetailBob;
viewDetailBob.append("ns", sourceNss.ns());
viewDetailBob.append("pipeline", resolvedView.getValue().getPipeline());
return viewDetailBob.obj();
}
void ViewShardingCheck::appendShardedViewStatus(const BSONObj& resolvedView, BSONObjBuilder* out) {
invariant(out);
invariant(!resolvedView.isEmpty());
out->append("resolvedView", resolvedView);
Status status{ErrorCodes::CommandOnShardedViewNotSupportedOnMongod,
str::stream() << "Command on view must be executed by mongos"};
Command::appendCommandStatus(*out, status);
}
bool ViewShardingCheck::collectionIsSharded(OperationContext* opCtx, const NamespaceString& nss) {
// The database is locked at this point but the collection underlying the given view is not
// and must be for a sharding check.
dassert(opCtx->lockState()->isDbLockedForMode(nss.db(), MODE_IS));
AutoGetCollection autoGetCol(opCtx, nss, MODE_IS);
return CollectionShardingState::get(opCtx, nss)->collectionIsSharded();
}
} // namespace mongo
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