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/**
* Copyright (C) 2021-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/platform/basic.h"
#include "mongo/db/s/resharding/resharding_data_copy_util.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/concurrency/write_conflict_exception.h"
#include "mongo/db/dbhelpers.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/storage/write_unit_of_work.h"
namespace mongo::resharding::data_copy {
void ensureCollectionExists(OperationContext* opCtx,
const NamespaceString& nss,
const CollectionOptions& options) {
invariant(!opCtx->lockState()->isLocked());
invariant(!opCtx->lockState()->inAWriteUnitOfWork());
writeConflictRetry(opCtx, "resharding::data_copy::ensureCollectionExists", nss.toString(), [&] {
AutoGetCollection coll(opCtx, nss, MODE_IX);
if (coll) {
return;
}
WriteUnitOfWork wuow(opCtx);
coll.ensureDbExists()->createCollection(opCtx, nss, options);
wuow.commit();
});
}
void ensureCollectionDropped(OperationContext* opCtx,
const NamespaceString& nss,
const boost::optional<CollectionUUID>& uuid) {
invariant(!opCtx->lockState()->isLocked());
invariant(!opCtx->lockState()->inAWriteUnitOfWork());
writeConflictRetry(
opCtx, "resharding::data_copy::ensureCollectionDropped", nss.toString(), [&] {
AutoGetCollection coll(opCtx, nss, MODE_X);
if (!coll || (uuid && coll->uuid() != uuid)) {
// If the collection doesn't exist or exists with a different UUID, then the
// requested collection has been dropped already.
return;
}
WriteUnitOfWork wuow(opCtx);
uassertStatusOK(coll.getDb()->dropCollectionEvenIfSystem(opCtx, nss));
wuow.commit();
});
}
Value findHighestInsertedId(OperationContext* opCtx, const CollectionPtr& collection) {
auto qr = std::make_unique<QueryRequest>(collection->ns());
qr->setLimit(1);
qr->setSort(BSON("_id" << -1));
auto recordId = Helpers::findOne(opCtx, collection, std::move(qr), true /* requireIndex */);
if (!recordId.isNormal()) {
return Value{};
}
auto doc = collection->docFor(opCtx, recordId).value();
auto value = Value{doc["_id"]};
uassert(4929300,
"Missing _id field for document in temporary resharding collection",
!value.missing());
return value;
}
} // namespace mongo::resharding::data_copy
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