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/**
* Copyright (C) 2019-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.
*/
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand
#include "mongo/platform/basic.h"
#include "mongo/db/auth/authorization_session.h"
#include "mongo/db/commands.h"
#include "mongo/db/commands/rwc_defaults_commands_gen.h"
#include "mongo/db/dbdirectclient.h"
#include "mongo/db/namespace_string.h"
#include "mongo/db/ops/write_ops.h"
#include "mongo/db/read_write_concern_defaults.h"
#include "mongo/db/repl/read_concern_args.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/logv2/log.h"
#include "mongo/rpc/get_status_from_command_result.h"
#include "mongo/util/fail_point.h"
namespace mongo {
namespace {
// Hang during the execution of SetDefaultRWConcernCommand.
MONGO_FAIL_POINT_DEFINE(hangWhileSettingDefaultRWC);
/**
* Replaces the persisted default read/write concern document with a new one representing the given
* defaults. Waits for the write concern on the given operation context to be satisfied before
* returning.
*/
void updatePersistedDefaultRWConcernDocument(OperationContext* opCtx, const RWConcernDefault& rw) {
DBDirectClient client(opCtx);
const auto commandResponse = client.runCommand([&] {
write_ops::UpdateCommandRequest updateOp(NamespaceString::kConfigSettingsNamespace);
updateOp.setUpdates({[&] {
write_ops::UpdateOpEntry entry;
entry.setQ(BSON("_id" << ReadWriteConcernDefaults::kPersistedDocumentId));
// Note the _id is propagated from the query into the upserted document.
entry.setU(write_ops::UpdateModification::parseFromClassicUpdate(rw.toBSON()));
entry.setUpsert(true);
return entry;
}()});
return updateOp.serialize(
BSON(WriteConcernOptions::kWriteConcernField << opCtx->getWriteConcern().toBSON()));
}());
uassertStatusOK(getStatusFromWriteCommandReply(commandResponse->getCommandReply()));
}
void assertNotStandaloneOrShardServer(OperationContext* opCtx, StringData cmdName) {
const auto replCoord = repl::ReplicationCoordinator::get(opCtx);
uassert(51300,
str::stream() << "'" << cmdName << "' is not supported on standalone nodes.",
replCoord->isReplEnabled());
uassert(51301,
str::stream() << "'" << cmdName << "' is not supported on shard nodes.",
serverGlobalParams.clusterRole != ClusterRole::ShardServer);
}
auto makeResponse(const ReadWriteConcernDefaults::RWConcernDefaultAndTime& rwcDefault,
bool inMemory) {
GetDefaultRWConcernResponse response;
response.setRWConcernDefault(rwcDefault);
response.setLocalUpdateWallClockTime(rwcDefault.localUpdateWallClockTime());
if (inMemory)
response.setInMemory(true);
return response;
}
class SetDefaultRWConcernCommand : public TypedCommand<SetDefaultRWConcernCommand> {
public:
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kNever;
}
bool adminOnly() const override {
return true;
}
std::string help() const override {
return "set the current read/write concern defaults (cluster-wide)";
}
public:
using Request = SetDefaultRWConcern;
class Invocation final : public InvocationBase {
public:
using InvocationBase::InvocationBase;
auto typedRun(OperationContext* opCtx) {
assertNotStandaloneOrShardServer(opCtx, SetDefaultRWConcern::kCommandName);
auto replCoord = repl::ReplicationCoordinator::get(opCtx);
auto wcChanges = replCoord->getWriteConcernTagChanges();
// Synchronize this change with potential changes to the write concern tags.
uassert(ErrorCodes::ConfigurationInProgress,
"Replica set reconfig in progress. Please retry the command later.",
wcChanges->reserveDefaultWriteConcernChange());
ON_BLOCK_EXIT([&]() { wcChanges->releaseDefaultWriteConcernChange(); });
hangWhileSettingDefaultRWC.pauseWhileSet();
auto& rwcDefaults = ReadWriteConcernDefaults::get(opCtx->getServiceContext());
auto newDefaults = rwcDefaults.generateNewCWRWCToBeSavedOnDisk(
opCtx, request().getDefaultReadConcern(), request().getDefaultWriteConcern());
// We don't want to check if the custom write concern exists on the config servers
// because it only has to exist on the actual shards in order to be valid.
if (serverGlobalParams.clusterRole != ClusterRole::ConfigServer) {
if (auto optWC = newDefaults.getDefaultWriteConcern()) {
uassertStatusOK(replCoord->validateWriteConcern(*optWC));
}
}
updatePersistedDefaultRWConcernDocument(opCtx, newDefaults);
LOGV2(20498,
"Successfully set RWC defaults to {value}",
"Successfully set RWC defaults",
"value"_attr = newDefaults);
// Refresh to populate the cache with the latest defaults.
rwcDefaults.refreshIfNecessary(opCtx);
return makeResponse(rwcDefaults.getDefault(opCtx), false);
}
private:
bool supportsWriteConcern() const override {
return true;
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"Unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForPrivilege(Privilege{ResourcePattern::forClusterResource(),
ActionType::setDefaultRWConcern}));
}
NamespaceString ns() const override {
return NamespaceString(request().getDbName(), "");
}
};
} setDefaultRWConcernCommand;
class GetDefaultRWConcernCommand : public TypedCommand<GetDefaultRWConcernCommand> {
public:
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool adminOnly() const override {
return true;
}
std::string help() const override {
return "get the current read/write concern defaults being applied by this node";
}
public:
using Request = GetDefaultRWConcern;
class Invocation final : public InvocationBase {
public:
using InvocationBase::InvocationBase;
auto typedRun(OperationContext* opCtx) {
assertNotStandaloneOrShardServer(opCtx, GetDefaultRWConcern::kCommandName);
auto& rwcDefaults = ReadWriteConcernDefaults::get(opCtx->getServiceContext());
const bool inMemory = request().getInMemory().value_or(false);
if (!inMemory) {
// If not asking for the in-memory values, force a refresh to find the most recent
// defaults
rwcDefaults.refreshIfNecessary(opCtx);
}
return makeResponse(rwcDefaults.getDefault(opCtx), inMemory);
}
private:
bool supportsWriteConcern() const override {
return false;
}
void doCheckAuthorization(OperationContext* opCtx) const override {
uassert(ErrorCodes::Unauthorized,
"Unauthorized",
AuthorizationSession::get(opCtx->getClient())
->isAuthorizedForPrivilege(Privilege{ResourcePattern::forClusterResource(),
ActionType::getDefaultRWConcern}));
}
NamespaceString ns() const override {
return NamespaceString(request().getDbName(), "");
}
};
} getDefaultRWConcernCommand;
} // namespace
} // namespace mongo
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