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/**
* Copyright (C) 2022-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/change_collection_expired_documents_remover.h"
#include "mongo/bson/bsonobj.h"
#include "mongo/db/catalog/catalog_test_fixture.h"
#include "mongo/db/catalog_raii.h"
#include "mongo/db/change_stream_change_collection_manager.h"
#include "mongo/db/exec/document_value/document_value_test_util.h"
#include "mongo/db/query/internal_plans.h"
#include "mongo/db/query/plan_executor.h"
#include "mongo/db/record_id_helpers.h"
#include "mongo/db/repl/oplog_entry.h"
#include "mongo/db/repl/optime.h"
#include "mongo/db/service_context.h"
#include "mongo/db/storage/record_data.h"
#include "mongo/idl/server_parameter_test_util.h"
#include "mongo/unittest/unittest.h"
#include "mongo/util/clock_source_mock.h"
#include "mongo/util/duration.h"
#include "pipeline/change_stream_test_helpers.h"
namespace mongo {
class ChangeCollectionExpiredChangeRemoverTest : public CatalogTestFixture {
protected:
ChangeCollectionExpiredChangeRemoverTest()
: CatalogTestFixture(Options{}.useMockClock(true)), _tenantId(OID::gen()) {
ChangeStreamChangeCollectionManager::create(getServiceContext());
}
ClockSourceMock* clockSource() {
return static_cast<ClockSourceMock*>(getServiceContext()->getFastClockSource());
}
Date_t now() {
return clockSource()->now();
}
void insertDocumentToChangeCollection(OperationContext* opCtx,
boost::optional<TenantId> tenantId,
const BSONObj& obj) {
const auto wallTime = now();
Timestamp timestamp{wallTime};
repl::MutableOplogEntry oplogEntry;
oplogEntry.setOpTime(repl::OpTime{timestamp, 0});
oplogEntry.setOpType(repl::OpTypeEnum::kNoop);
oplogEntry.setNss(NamespaceString::makeChangeCollectionNSS(tenantId));
oplogEntry.setObject(obj);
oplogEntry.setWallClockTime(wallTime);
auto oplogEntryBson = oplogEntry.toBSON();
RecordData recordData{oplogEntryBson.objdata(), oplogEntryBson.objsize()};
RecordId recordId = record_id_helpers::keyForDate(wallTime);
AutoGetChangeCollection changeCollection{
opCtx, AutoGetChangeCollection::AccessMode::kWrite, tenantId};
WriteUnitOfWork wunit(opCtx);
ChangeStreamChangeCollectionManager::get(opCtx).insertDocumentsToChangeCollection(
opCtx, {Record{recordId, recordData}}, {timestamp});
wunit.commit();
}
std::vector<repl::OplogEntry> readChangeCollection(OperationContext* opCtx,
boost::optional<TenantId> tenantId) {
auto changeCollection =
AutoGetChangeCollection{opCtx, AutoGetChangeCollection::AccessMode::kRead, tenantId};
auto scanExecutor =
InternalPlanner::collectionScan(opCtx,
&(*changeCollection),
PlanYieldPolicy::YieldPolicy::INTERRUPT_ONLY,
InternalPlanner::Direction::FORWARD);
BSONObj currChangeDoc;
std::vector<repl::OplogEntry> entries;
while (scanExecutor->getNext(&currChangeDoc, nullptr) == PlanExecutor::ADVANCED) {
entries.push_back(repl::OplogEntry(currChangeDoc));
}
return entries;
}
void dropAndRecreateChangeCollection(OperationContext* opCtx,
boost::optional<TenantId> tenantId) {
auto changeCollectionManager = ChangeStreamChangeCollectionManager::get(opCtx);
changeCollectionManager.dropChangeCollection(opCtx, tenantId);
changeCollectionManager.createChangeCollection(opCtx, tenantId);
}
const boost::optional<TenantId> _tenantId;
RAIIServerParameterControllerForTest featureFlagController{"featureFlagServerlessChangeStreams",
true};
boost::optional<ChangeStreamChangeCollectionManager> _changeCollectionManager;
};
// Tests that the last expired focument retrieved is the expected one.
TEST_F(ChangeCollectionExpiredChangeRemoverTest, VerifyLastExpiredDocument) {
const auto opCtx = operationContext();
dropAndRecreateChangeCollection(opCtx, _tenantId);
Date_t expirationTime;
BSONObj lastExpiredDocument;
// Create 100 change documents and consider the first 50 of them as expired.
for (int i = 0; i < 100; ++i) {
auto doc = BSON("_id" << i);
insertDocumentToChangeCollection(opCtx, _tenantId, doc);
// Store the last expired document and it's wallTime.
if (i == 50) {
lastExpiredDocument = doc;
expirationTime = now();
}
clockSource()->advance(Milliseconds(1));
}
auto changeCollection =
AutoGetChangeCollection{opCtx, AutoGetChangeCollection::AccessMode::kRead, _tenantId};
const auto maxExpiredRecordId =
ChangeStreamChangeCollectionManager::getChangeCollectionMaxExpiredRecordId(
opCtx, &*changeCollection, expirationTime);
// Get the document found at 'maxExpiredRecordId' and test it against 'lastExpiredDocument'.
auto scanExecutor =
InternalPlanner::collectionScan(opCtx,
&(*changeCollection),
PlanYieldPolicy::YieldPolicy::INTERRUPT_ONLY,
InternalPlanner::Direction::FORWARD,
boost::none,
maxExpiredRecordId,
maxExpiredRecordId);
BSONObj changeDocAtId;
ASSERT_EQ(scanExecutor->getNext(&changeDocAtId, nullptr), PlanExecutor::ADVANCED);
ASSERT_BSONOBJ_EQ(repl::OplogEntry(changeDocAtId).getObject(), lastExpiredDocument);
}
// Tests that only the expired documents are removed from the change collection.
TEST_F(ChangeCollectionExpiredChangeRemoverTest, ShouldRemoveOnlyExpiredDocument) {
const auto opCtx = operationContext();
dropAndRecreateChangeCollection(opCtx, _tenantId);
const BSONObj firstExpired = BSON("_id"
<< "firstExpired");
const BSONObj secondExpired = BSON("_id"
<< "secondExpired");
const BSONObj notExpired = BSON("_id"
<< "notExpired");
insertDocumentToChangeCollection(opCtx, _tenantId, firstExpired);
clockSource()->advance(Hours(1));
insertDocumentToChangeCollection(opCtx, _tenantId, secondExpired);
// Store the wallTime of the last expired document.
const auto expirationTime = now();
clockSource()->advance(Hours(1));
insertDocumentToChangeCollection(opCtx, _tenantId, notExpired);
// Verify that only the required documents are removed.
ASSERT_EQ(ChangeStreamChangeCollectionManager::removeExpiredChangeCollectionsDocuments(
opCtx, _tenantId, expirationTime),
2);
// Only the 'notExpired' document is left in the change collection.
const auto changeCollectionEntries = readChangeCollection(opCtx, _tenantId);
ASSERT_EQ(changeCollectionEntries.size(), 1);
ASSERT_BSONOBJ_EQ(changeCollectionEntries[0].getObject(), notExpired);
}
// Tests that the last expired document is never deleted.
TEST_F(ChangeCollectionExpiredChangeRemoverTest, ShouldLeaveAtLeastOneDocument) {
const auto opCtx = operationContext();
dropAndRecreateChangeCollection(opCtx, _tenantId);
for (int i = 0; i < 100; ++i) {
insertDocumentToChangeCollection(opCtx, _tenantId, BSON("_id" << i));
clockSource()->advance(Milliseconds{1});
}
// Verify that all but the last document is removed.
ASSERT_EQ(ChangeStreamChangeCollectionManager::removeExpiredChangeCollectionsDocuments(
opCtx, _tenantId, now()),
99);
// Only the last document is left in the change collection.
const auto changeCollectionEntries = readChangeCollection(opCtx, _tenantId);
ASSERT_EQ(changeCollectionEntries.size(), 1);
ASSERT_BSONOBJ_EQ(changeCollectionEntries[0].getObject(), BSON("_id" << 99));
}
} // namespace mongo
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