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/**
* Copyright (C) 2018-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/transaction_coordinator_catalog.h"
#include "mongo/s/shard_server_test_fixture.h"
#include "mongo/unittest/death_test.h"
#include "mongo/unittest/unittest.h"
namespace mongo {
namespace {
const Timestamp dummyTimestamp = Timestamp::min();
class TransactionCoordinatorCatalogTest : public ShardServerTestFixture {
public:
void setUp() override {
ShardServerTestFixture::setUp();
_coordinatorCatalog = std::make_shared<TransactionCoordinatorCatalog>();
}
void tearDown() override {
_coordinatorCatalog.reset();
// Make sure all of the coordinators are in a committed/aborted state before they are
// destroyed. Otherwise, the coordinator's destructor will invariant because it will still
// have outstanding futures that have not been completed (the one to remove itself from the
// catalog). This has the added benefit of testing whether it's okay to destroy
// the catalog while there are outstanding coordinators.
for (auto& coordinator : _coordinatorsForTest) {
coordinator->cancelIfCommitNotYetStarted();
}
_coordinatorsForTest.clear();
ShardServerTestFixture::tearDown();
}
TransactionCoordinatorCatalog& coordinatorCatalog() {
return *_coordinatorCatalog;
}
void createCoordinatorInCatalog(OperationContext* opCtx,
LogicalSessionId lsid,
TxnNumber txnNumber) {
auto newCoordinator =
std::make_shared<TransactionCoordinator>(getServiceContext(), lsid, txnNumber);
coordinatorCatalog().insert(opCtx, lsid, txnNumber, newCoordinator);
_coordinatorsForTest.push_back(newCoordinator);
}
private:
// Note: MUST be shared_ptr due to use of std::enable_shared_from_this
std::shared_ptr<TransactionCoordinatorCatalog> _coordinatorCatalog;
std::vector<std::shared_ptr<TransactionCoordinator>> _coordinatorsForTest;
};
TEST_F(TransactionCoordinatorCatalogTest, GetOnSessionThatDoesNotExistReturnsNone) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
auto coordinator = coordinatorCatalog().get(operationContext(), lsid, txnNumber);
ASSERT(coordinator == nullptr);
}
TEST_F(TransactionCoordinatorCatalogTest,
GetOnSessionThatExistsButTxnNumberThatDoesntExistReturnsNone) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
auto coordinatorInCatalog = coordinatorCatalog().get(operationContext(), lsid, txnNumber + 1);
ASSERT(coordinatorInCatalog == nullptr);
}
TEST_F(TransactionCoordinatorCatalogTest, CreateFollowedByGetReturnsCoordinator) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
auto coordinatorInCatalog = coordinatorCatalog().get(operationContext(), lsid, txnNumber);
ASSERT(coordinatorInCatalog != nullptr);
}
TEST_F(TransactionCoordinatorCatalogTest, SecondCreateForSessionDoesNotOverwriteFirstCreate) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber1 = 1;
TxnNumber txnNumber2 = 2;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber1);
createCoordinatorInCatalog(operationContext(), lsid, txnNumber2);
auto coordinator1InCatalog = coordinatorCatalog().get(operationContext(), lsid, txnNumber1);
ASSERT(coordinator1InCatalog != nullptr);
}
DEATH_TEST_F(TransactionCoordinatorCatalogTest,
CreatingACoordinatorWithASessionIdAndTxnNumberThatAlreadyExistFails,
"Invariant failure") {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
// Re-creating w/ same session id and txn number should cause invariant failure
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
}
TEST_F(TransactionCoordinatorCatalogTest, GetLatestOnSessionWithNoCoordinatorsReturnsNone) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
auto latestTxnNumAndCoordinator =
coordinatorCatalog().getLatestOnSession(operationContext(), lsid);
ASSERT_FALSE(latestTxnNumAndCoordinator);
}
TEST_F(TransactionCoordinatorCatalogTest,
CreateFollowedByGetLatestOnSessionReturnsOnlyCoordinator) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
auto latestTxnNumAndCoordinator =
coordinatorCatalog().getLatestOnSession(operationContext(), lsid);
ASSERT_TRUE(latestTxnNumAndCoordinator);
ASSERT_EQ(latestTxnNumAndCoordinator->first, txnNumber);
}
TEST_F(TransactionCoordinatorCatalogTest, CoordinatorsRemoveThemselvesFromCatalogWhenTheyComplete) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber = 1;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber);
auto coordinator = coordinatorCatalog().get(operationContext(), lsid, txnNumber);
coordinator->cancelIfCommitNotYetStarted();
ASSERT(coordinator->onCompletion().isReady());
auto latestTxnNumAndCoordinator =
coordinatorCatalog().getLatestOnSession(operationContext(), lsid);
ASSERT_FALSE(latestTxnNumAndCoordinator);
}
TEST_F(TransactionCoordinatorCatalogTest,
TwoCreatesFollowedByGetLatestOnSessionReturnsCoordinatorWithHighestTxnNumber) {
LogicalSessionId lsid = makeLogicalSessionIdForTest();
TxnNumber txnNumber1 = 1;
TxnNumber txnNumber2 = 2;
createCoordinatorInCatalog(operationContext(), lsid, txnNumber1);
createCoordinatorInCatalog(operationContext(), lsid, txnNumber2);
auto latestTxnNumAndCoordinator =
coordinatorCatalog().getLatestOnSession(operationContext(), lsid);
ASSERT_EQ(latestTxnNumAndCoordinator->first, txnNumber2);
}
} // namespace
} // namespace mongo
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