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/**
* Copyright (C) 2023-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/curop.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/wiredtiger/wiredtiger_prepare_conflict.h"
#include "mongo/unittest/temp_dir.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/clock_source_mock.h"
namespace mongo {
namespace {
/**
* Returns a new instance of the WiredTigerKVEngine.
*/
std::unique_ptr<WiredTigerKVEngine> makeKVEngine(ServiceContext* serviceContext,
const std::string& path,
ClockSource* clockSource) {
auto client = serviceContext->makeClient("myClient");
auto opCtx = serviceContext->makeOperationContext(client.get());
return std::make_unique<WiredTigerKVEngine>(
opCtx.get(),
/*canonicalName=*/"",
path,
clockSource,
/*extraOpenOptions=*/"",
// Refer to config string in WiredTigerCApiTest::RollbackToStable40.
/*cacheSizeMB=*/1,
/*maxHistoryFileSizeMB=*/0,
/*ephemeral=*/false,
/*repair=*/false);
}
class WiredTigerPrepareConflictTest : public unittest::Test {
public:
void setUp() override {
setGlobalServiceContext(ServiceContext::make());
auto serviceContext = getGlobalServiceContext();
client = serviceContext->makeClient("myClient");
opCtx = serviceContext->makeOperationContext(client.get());
kvEngine = makeKVEngine(serviceContext, home.path(), &cs);
opCtx->setRecoveryUnit(std::unique_ptr<RecoveryUnit>(kvEngine->newRecoveryUnit()),
WriteUnitOfWork::RecoveryUnitState::kNotInUnitOfWork);
}
unittest::TempDir home{"temp"};
ClockSourceMock cs;
std::unique_ptr<WiredTigerKVEngine> kvEngine;
ServiceContext::UniqueClient client;
ServiceContext::UniqueOperationContext opCtx;
};
TEST_F(WiredTigerPrepareConflictTest, SuccessWithNoConflict) {
auto successOnFirstTry = []() {
return 0;
};
ASSERT_EQ(wiredTigerPrepareConflictRetry(opCtx.get(), successOnFirstTry), 0);
ASSERT_EQ(CurOp::get(opCtx.get())->debug().additiveMetrics.prepareReadConflicts.load(), 0);
}
TEST_F(WiredTigerPrepareConflictTest, HandleWTPrepareConflictOnce) {
auto attempt = 0;
auto throwWTPrepareConflictOnce = [&attempt]() {
return attempt++ < 1 ? WT_PREPARE_CONFLICT : 0;
};
ASSERT_EQ(wiredTigerPrepareConflictRetry(opCtx.get(), throwWTPrepareConflictOnce), 0);
ASSERT_EQ(CurOp::get(opCtx.get())->debug().additiveMetrics.prepareReadConflicts.load(), 1);
}
TEST_F(WiredTigerPrepareConflictTest, HandleWTPrepareConflictMultipleTimes) {
auto attempt = 0;
auto sessionCache =
static_cast<WiredTigerRecoveryUnit*>(opCtx->recoveryUnit())->getSessionCache();
auto throwWTPrepareConflictMultipleTimes = [&sessionCache, &attempt]() {
// Manually increments '_prepareCommitOrAbortCounter' to simulate a unit of work has been
// committed/aborted to continue retrying.
sessionCache->notifyPreparedUnitOfWorkHasCommittedOrAborted();
return attempt++ < 100 ? WT_PREPARE_CONFLICT : 0;
};
ASSERT_EQ(wiredTigerPrepareConflictRetry(opCtx.get(), throwWTPrepareConflictMultipleTimes), 0);
ASSERT_EQ(CurOp::get(opCtx.get())->debug().additiveMetrics.prepareReadConflicts.load(), 100);
}
} // namespace
} // namespace mongo
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