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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/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/set_user_write_block_mode_gen.h"
#include "mongo/db/index_builds_coordinator.h"
#include "mongo/db/repl/repl_client_info.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/db/s/global_user_write_block_state.h"
#include "mongo/db/s/user_writes_recoverable_critical_section_service.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kAccessControl
namespace mongo {
namespace {
class SetUserWriteBlockModeCommand final : public TypedCommand<SetUserWriteBlockModeCommand> {
public:
using Request = SetUserWriteBlockMode;
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
bool adminOnly() const override {
return false;
}
std::string help() const override {
return "Set whether user write blocking is enabled";
}
class Invocation final : public InvocationBase {
public:
using InvocationBase::InvocationBase;
void typedRun(OperationContext* opCtx) {
uassert(ErrorCodes::IllegalOperation,
str::stream() << Request::kCommandName
<< " cannot be run on shardsvrs nor configsvrs",
serverGlobalParams.clusterRole == ClusterRole::None);
uassert(ErrorCodes::IllegalOperation,
str::stream() << Request::kCommandName << " cannot be run on standalones",
repl::ReplicationCoordinator::get(opCtx)->getReplicationMode() !=
repl::ReplicationCoordinator::modeNone);
// Only one attempt to change write block mode may make progress at once, because the
// way we enable/disable user index build blocking is not concurrency-safe.
stdx::lock_guard lock(_mutex);
{
if (request().getGlobal()) {
// Enabling write block mode on a replicaset requires several steps
// First, we must prevent new index builds from starting
auto writeBlockState = GlobalUserWriteBlockState::get(opCtx);
writeBlockState->enableUserIndexBuildBlocking(opCtx);
// Ensure that we eventually restore index build state.
ScopeGuard guard(
[&]() { writeBlockState->disableUserIndexBuildBlocking(opCtx); });
// Abort and wait for ongoing index builds to finish.
IndexBuildsCoordinator::get(opCtx)->abortUserIndexBuildsForUserWriteBlocking(
opCtx);
// Engage write blocking
UserWritesRecoverableCriticalSectionService::get(opCtx)
->acquireRecoverableCriticalSectionBlockingUserWrites(
opCtx,
UserWritesRecoverableCriticalSectionService::
kGlobalUserWritesNamespace);
} else {
UserWritesRecoverableCriticalSectionService::get(opCtx)
->releaseRecoverableCriticalSection(
opCtx,
UserWritesRecoverableCriticalSectionService::
kGlobalUserWritesNamespace);
}
}
// Wait for the writes to the UserWritesRecoverableCriticalSection collection to be
// majority commited.
auto& replClient = repl::ReplClientInfo::forClient(opCtx->getClient());
WriteConcernResult writeConcernResult;
WriteConcernOptions majority(WriteConcernOptions::kMajority,
WriteConcernOptions::SyncMode::UNSET,
WriteConcernOptions::kWriteConcernTimeoutUserCommand);
uassertStatusOK(
waitForWriteConcern(opCtx, replClient.getLastOp(), majority, &writeConcernResult));
}
private:
bool supportsWriteConcern() const override {
return false;
}
NamespaceString ns() const override {
return NamespaceString();
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"Unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForPrivilege(Privilege{ResourcePattern::forClusterResource(),
ActionType::setUserWriteBlockMode}));
}
Mutex _mutex = MONGO_MAKE_LATCH("SetUserWriteBlockModeCommand::_mutex");
};
} setUserWriteBlockModeCommand;
} // namespace
} // namespace mongo
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