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/**
* Copyright (C) 2019-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/collection_catalog_helper.h"
#include "mongo/db/catalog/collection.h"
#include "mongo/db/catalog/collection_catalog.h"
#include "mongo/db/concurrency/d_concurrency.h"
namespace mongo {
MONGO_FAIL_POINT_DEFINE(hangBeforeGettingNextCollection);
namespace catalog {
void forEachCollectionFromDb(OperationContext* opCtx,
StringData dbName,
LockMode collLockMode,
CollectionCatalog::CollectionInfoFn callback,
CollectionCatalog::CollectionInfoFn predicate) {
CollectionCatalog& catalog = CollectionCatalog::get(opCtx);
for (auto collectionIt = catalog.begin(dbName); collectionIt != catalog.end(); ++collectionIt) {
auto uuid = collectionIt.uuid().get();
if (predicate && !catalog.checkIfCollectionSatisfiable(uuid, predicate)) {
continue;
}
boost::optional<Lock::CollectionLock> clk;
Collection* collection = nullptr;
while (auto nss = catalog.lookupNSSByUUID(opCtx, uuid)) {
// Get a fresh snapshot for each locked collection to see any catalog changes.
clk.emplace(opCtx, *nss, collLockMode);
opCtx->recoveryUnit()->abandonSnapshot();
if (catalog.lookupNSSByUUID(opCtx, uuid) == nss) {
// Success: locked the namespace and the UUID still maps to it.
collection = catalog.lookupCollectionByUUID(opCtx, uuid);
invariant(collection);
break;
}
// Failed: collection got renamed before locking it, so unlock and try again.
clk.reset();
}
// The NamespaceString couldn't be resolved from the uuid, so the collection was dropped.
if (!collection)
continue;
if (!callback(collection))
break;
hangBeforeGettingNextCollection.pauseWhileSet();
}
}
} // namespace catalog
} // namespace mongo
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