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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/cluster_server_parameter_cmds_gen.h"
#include "mongo/db/repl/replication_coordinator.h"
#include "mongo/idl/cluster_server_parameter_gen.h"
#include "mongo/logv2/log.h"
#define MONGO_LOGV2_DEFAULT_COMPONENT ::mongo::logv2::LogComponent::kCommand
namespace mongo {
namespace {
class GetClusterParameterCommand final : public TypedCommand<GetClusterParameterCommand> {
public:
using Request = GetClusterParameter;
using Reply = GetClusterParameter::Reply;
using Map = ServerParameterSet::Map;
AllowedOnSecondary secondaryAllowed(ServiceContext*) const override {
return AllowedOnSecondary::kAlways;
}
bool adminOnly() const override {
return true;
}
std::string help() const override {
return "Get in-memory cluster parameter value(s) from this node";
}
class Invocation final : public InvocationBase {
public:
using InvocationBase::InvocationBase;
Reply typedRun(OperationContext* opCtx) {
uassert(
ErrorCodes::IllegalOperation,
"featureFlagClusterWideConfig not enabled",
gFeatureFlagClusterWideConfig.isEnabled(serverGlobalParams.featureCompatibility));
// TODO SERVER-65249: This will eventually be made specific to the parameter being set
// so that some parameters will be able to use getClusterParameter even on standalones.
uassert(ErrorCodes::IllegalOperation,
str::stream() << Request::kCommandName << " cannot be run on standalones",
repl::ReplicationCoordinator::get(opCtx)->getReplicationMode() !=
repl::ReplicationCoordinator::modeNone);
const stdx::variant<std::string, std::vector<std::string>>& cmdBody =
request().getCommandParameter();
ServerParameterSet* clusterParameters = ServerParameterSet::getClusterParameterSet();
std::vector<BSONObj> parameterValues;
std::vector<std::string> parameterNames;
// For each parameter, generate a BSON representation of it and retrieve its name.
auto makeBSON = [&](ServerParameter* requestedParameter) {
// Skip any disabled cluster parameters.
if (requestedParameter->isEnabled()) {
BSONObjBuilder bob;
requestedParameter->append(opCtx, bob, requestedParameter->name());
parameterValues.push_back(bob.obj());
parameterNames.push_back(requestedParameter->name());
}
};
stdx::visit(
visit_helper::Overloaded{
[&](const std::string& strParameterName) {
if (strParameterName == "*"_sd) {
// Retrieve all cluster parameter values.
Map clusterParameterMap = clusterParameters->getMap();
parameterValues.reserve(clusterParameterMap.size());
parameterNames.reserve(clusterParameterMap.size());
for (const auto& param : clusterParameterMap) {
makeBSON(param.second);
}
} else {
// Any other string must correspond to a single parameter name. Return
// an error if a disabled cluster parameter is explicitly requested.
ServerParameter* sp = clusterParameters->get(strParameterName);
uassert(ErrorCodes::BadValue,
str::stream() << "Server parameter: '" << strParameterName
<< "' is currently disabled",
sp->isEnabled());
makeBSON(sp);
}
},
[&](const std::vector<std::string>& listParameterNames) {
uassert(ErrorCodes::BadValue,
"Must supply at least one cluster server parameter name to "
"getClusterParameter",
listParameterNames.size() > 0);
parameterValues.reserve(listParameterNames.size());
parameterNames.reserve(listParameterNames.size());
for (const auto& requestedParameterName : listParameterNames) {
ServerParameter* sp = clusterParameters->get(requestedParameterName);
uassert(ErrorCodes::BadValue,
str::stream() << "Server parameter: '" << requestedParameterName
<< "' is currently disabled'",
sp->isEnabled());
makeBSON(sp);
}
}},
cmdBody);
LOGV2_DEBUG(6226100,
2,
"Retrieved parameter values for cluster server parameters",
"parameterNames"_attr = parameterNames);
return Reply(parameterValues);
}
private:
bool supportsWriteConcern() const override {
return false;
}
void doCheckAuthorization(OperationContext* opCtx) const override {
auto* authzSession = AuthorizationSession::get(opCtx->getClient());
uassert(ErrorCodes::Unauthorized,
"Not authorized to retrieve cluster server parameters",
authzSession->isAuthorizedForPrivilege(Privilege{
ResourcePattern::forClusterResource(), ActionType::getClusterParameter}));
}
NamespaceString ns() const override {
return NamespaceString(request().getDbName(), "");
}
};
} getClusterParameterCommand;
} // namespace
} // namespace mongo
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