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/**
* Copyright (C) 2017 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/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/operation_context.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/transaction_history_iterator.h"
#include "mongo/logger/redaction.h"
#include "mongo/util/mongoutils/str.h"
namespace mongo {
TransactionHistoryIterator::TransactionHistoryIterator(Timestamp startingOpTimeTs)
: _nextOpTimeTs(std::move(startingOpTimeTs)) {}
bool TransactionHistoryIterator::hasNext() const {
return !_nextOpTimeTs.isNull();
}
repl::OplogEntry TransactionHistoryIterator::next(OperationContext* opCtx) {
invariant(hasNext());
DBDirectClient client(opCtx);
// TODO: SERVER-29843 oplogReplay option might be needed to activate fast ts search.
auto oplogBSON =
client.findOne(NamespaceString::kRsOplogNamespace.ns(),
BSON(repl::OplogEntryBase::kTimestampFieldName << _nextOpTimeTs),
/* fieldsToReturn */ nullptr,
0 /* QueryOption_OplogReplay */);
uassert(ErrorCodes::IncompleteTransactionHistory,
str::stream() << "oplog no longer contains the complete write history of this "
"transaction, log with ts "
<< _nextOpTimeTs.toBSON()
<< " cannot be found",
!oplogBSON.isEmpty());
auto oplogEntry = uassertStatusOK(repl::OplogEntry::parse(oplogBSON));
const auto& oplogPrevTsOption = oplogEntry.getPrevWriteTsInTransaction();
uassert(
ErrorCodes::FailedToParse,
str::stream() << "Missing prevTs field on oplog entry of previous write in transcation: "
<< redact(oplogBSON),
oplogPrevTsOption);
_nextOpTimeTs = oplogPrevTsOption.value();
return oplogEntry;
}
} // namespace mongo
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