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/**
* 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/commands/external_data_source_scope_guard.h"
#include "mongo/db/catalog/create_collection.h"
#include "mongo/db/catalog/drop_collection.h"
#include "mongo/db/catalog/virtual_collection_options.h"
#include "mongo/db/drop_gen.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/pipeline/external_data_source_option_gen.h"
#include "mongo/logv2/log.h"
#include "mongo/util/destructor_guard.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kQuery
namespace mongo {
ExternalDataSourceScopeGuard::ExternalDataSourceScopeGuard(
OperationContext* opCtx,
const std::vector<std::pair<NamespaceString, std::vector<ExternalDataSourceInfo>>>&
usedExternalDataSources)
: _opCtx(opCtx) {
// Just in case that any virtual collection could not be created, when dtor does not have a
// chance to be executed, cleans up collections that has already been created at that
// moment.
ScopeGuard dropVcollGuard([&] { dropVirtualCollections(); });
for (auto&& [extDataSourceNss, dataSources] : usedExternalDataSources) {
VirtualCollectionOptions vopts(dataSources);
uassertStatusOK(createVirtualCollection(opCtx, extDataSourceNss, vopts));
_toBeDroppedVirtualCollections.emplace_back(extDataSourceNss);
}
dropVcollGuard.dismiss();
}
void ExternalDataSourceScopeGuard::dropVirtualCollections() noexcept {
// The move constructor sets '_opCtx' to null when ownership is moved to the other object which
// means this object must not try to drop collections. There's nothing to drop if '_opCtx' is
// null.
if (!_opCtx) {
return;
}
// This function is called in a context of destructor or exception and so guard this against any
// exceptions.
DESTRUCTOR_GUARD({
for (auto&& nss : _toBeDroppedVirtualCollections) {
DropReply reply;
auto status =
dropCollection(_opCtx,
nss,
&reply,
DropCollectionSystemCollectionMode::kDisallowSystemCollectionDrops);
if (!status.isOK()) {
LOGV2_ERROR(6968700, "Failed to drop an external data source", "coll"_attr = nss);
}
}
});
}
} // namespace mongo
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