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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/catalog/catalog_helper.h"
#include "mongo/db/catalog/collection_catalog.h"
namespace mongo::catalog_helper {
namespace {
MONGO_FAIL_POINT_DEFINE(setAutoGetCollectionWait);
/**
* Defines sorting order for NamespaceStrings based on what their ResourceId would be for locking.
*/
struct ResourceIdNssComparator {
bool operator()(const NamespaceString& lhs, const NamespaceString& rhs) const {
return ResourceId(RESOURCE_COLLECTION, lhs) < ResourceId(RESOURCE_COLLECTION, rhs);
}
};
} // namespace
void acquireCollectionLocksInResourceIdOrder(
OperationContext* opCtx,
const NamespaceStringOrUUID& nsOrUUID,
LockMode modeColl,
Date_t deadline,
const std::vector<NamespaceStringOrUUID>& secondaryNssOrUUIDs,
std::vector<CollectionNamespaceOrUUIDLock>* collLocks) {
invariant(collLocks->empty());
auto catalog = CollectionCatalog::get(opCtx);
// Use a set so that we can easily dedupe namespaces to avoid locking the same collection twice.
std::set<NamespaceString, ResourceIdNssComparator> temp;
std::set<NamespaceString, ResourceIdNssComparator> verifyTemp;
do {
// Clear the data structures when/if we loop more than once.
collLocks->clear();
temp.clear();
verifyTemp.clear();
// Create a single set with all the resolved namespaces sorted by ascending
// ResourceId(RESOURCE_COLLECTION, nss).
temp.insert(catalog->resolveNamespaceStringOrUUID(opCtx, nsOrUUID));
for (const auto& secondaryNssOrUUID : secondaryNssOrUUIDs) {
invariant(secondaryNssOrUUID.dbName() == nsOrUUID.dbName(),
str::stream()
<< "Unable to acquire locks for collections across different databases ("
<< secondaryNssOrUUID.toStringForErrorMsg() << " vs "
<< nsOrUUID.toStringForErrorMsg() << ")");
temp.insert(catalog->resolveNamespaceStringOrUUID(opCtx, secondaryNssOrUUID));
}
// Acquire all of the locks in order. And clear the 'catalog' because the locks will access
// a fresher one internally.
catalog = nullptr;
for (auto& nss : temp) {
collLocks->emplace_back(opCtx, nss, modeColl, deadline);
}
// Check that the namespaces have NOT changed after acquiring locks. It's possible to race
// with a rename collection when the given NamespaceStringOrUUID is a UUID, and consequently
// fail to lock the correct namespace.
//
// The catalog reference must be refreshed to see the latest Collection data. Otherwise we
// won't see any concurrent DDL/catalog operations.
auto catalog = CollectionCatalog::get(opCtx);
verifyTemp.insert(catalog->resolveNamespaceStringOrUUID(opCtx, nsOrUUID));
for (const auto& secondaryNssOrUUID : secondaryNssOrUUIDs) {
verifyTemp.insert(catalog->resolveNamespaceStringOrUUID(opCtx, secondaryNssOrUUID));
}
} while (temp != verifyTemp);
}
void setAutoGetCollectionWaitFailpointExecute(std::function<void(const BSONObj&)> callback) {
setAutoGetCollectionWait.execute(callback);
}
} // namespace mongo::catalog_helper
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