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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/auth/authorization_session.h"
#include "mongo/db/cancelable_operation_context.h"
#include "mongo/db/commands.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/s/database_sharding_state.h"
#include "mongo/db/s/sharding_recovery_service.h"
#include "mongo/db/s/sharding_state.h"
#include "mongo/db/transaction/transaction_participant.h"
#include "mongo/logv2/log.h"
#include "mongo/s/catalog/sharding_catalog_client.h"
#include "mongo/s/grid.h"
#include "mongo/s/request_types/move_primary_gen.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kSharding
namespace mongo {
namespace {
class ShardsvrMovePrimaryEnterCriticalSectionCommand final
: public TypedCommand<ShardsvrMovePrimaryEnterCriticalSectionCommand> {
public:
using Request = ShardsvrMovePrimaryEnterCriticalSection;
class Invocation final : public InvocationBase {
public:
using InvocationBase::InvocationBase;
void typedRun(OperationContext* opCtx) {
CommandHelpers::uassertCommandRunWithMajority(Request::kCommandName,
opCtx->getWriteConcern());
uassert(
ErrorCodes::InvalidOptions,
"{} expected to be called within a retryable write "_format(Request::kCommandName),
TransactionParticipant::get(opCtx));
{
// Using the original operation context, the two write operations to enter the
// critical section (acquire and promote) would use the same txnNumber, which would
// cause the failure of the second operation.
auto newClient = getGlobalServiceContext()->makeClient(
"ShardsvrMovePrimaryEnterCriticalSection");
AlternativeClientRegion acr(newClient);
auto newOpCtx = CancelableOperationContext(
cc().makeOperationContext(),
opCtx->getCancellationToken(),
Grid::get(opCtx->getServiceContext())->getExecutorPool()->getFixedExecutor());
newOpCtx->setAlwaysInterruptAtStepDownOrUp_UNSAFE();
const auto& dbName = request().getCommandParameter();
const auto& csReason = request().getReason();
// Waiting for the critical section on the database to complete is necessary to
// avoid the risk of invariant by attempting to enter the critical section as a
// dropDatabase operation may have already entered it.
waitForCriticalSectionToComplete(opCtx, dbName, csReason);
ShardingRecoveryService::get(newOpCtx.get())
->acquireRecoverableCriticalSectionBlockWrites(
newOpCtx.get(),
NamespaceString(dbName),
csReason,
ShardingCatalogClient::kLocalWriteConcern);
ShardingRecoveryService::get(newOpCtx.get())
->promoteRecoverableCriticalSectionToBlockAlsoReads(
newOpCtx.get(),
NamespaceString(dbName),
csReason,
ShardingCatalogClient::kLocalWriteConcern);
}
// Since no write that generated a retryable write oplog entry with this sessionId and
// txnNumber happened, we need to make a dummy write so that the session gets durably
// persisted on the oplog. This must be the last operation done on this command.
DBDirectClient dbClient(opCtx);
dbClient.update(NamespaceString::kServerConfigurationNamespace,
BSON("_id" << Request::kCommandName),
BSON("$inc" << BSON("count" << 1)),
true /* upsert */,
false /* multi */);
}
private:
NamespaceString ns() const override {
return NamespaceString(request().getDbName());
}
bool supportsWriteConcern() const override {
return true;
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"Unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForActionsOnResource(ResourcePattern::forClusterResource(),
ActionType::internal));
}
void waitForCriticalSectionToComplete(OperationContext* opCtx,
const DatabaseName& dbName,
const BSONObj& movePrimaryReason) {
auto criticalSectionSignal = [&]() -> boost::optional<SharedSemiFuture<void>> {
Lock::DBLock dbLock(opCtx, dbName, MODE_IS);
const auto scopedDss =
DatabaseShardingState::assertDbLockedAndAcquireShared(opCtx, dbName);
auto optCritSectionSignalSignal =
scopedDss->getCriticalSectionSignal(ShardingMigrationCriticalSection::kWrite);
if (optCritSectionSignalSignal) {
auto optCritSectionReason = scopedDss->getCriticalSectionReason();
tassert(7578800, "Found critical section without reason", optCritSectionReason);
if (movePrimaryReason.woCompare(*optCritSectionReason) == 0) {
return boost::none;
}
}
return optCritSectionSignalSignal;
}();
if (criticalSectionSignal) {
criticalSectionSignal->get(opCtx);
}
}
};
private:
bool adminOnly() const override {
return true;
}
bool skipApiVersionCheck() const override {
return true;
}
AllowedOnSecondary secondaryAllowed(ServiceContext* context) const override {
return AllowedOnSecondary::kNever;
}
std::string help() const override {
return "Internal command. Do not call directly.";
}
bool supportsRetryableWrite() const {
return true;
}
} shardsvrMovePrimaryEnterCriticalSectionCommand;
} // namespace
} // namespace mongo
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