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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.
*/
#pragma once
#include "mongo/db/commands.h"
#include "mongo/db/commands/mr_common.h"
#include "mongo/db/repl/replication_coordinator.h"
namespace mongo {
class MapReduceCommandBase : public ErrmsgCommandDeprecated {
public:
MapReduceCommandBase() : ErrmsgCommandDeprecated("mapReduce", "mapreduce") {}
std::string help() const override {
return "Runs the mapReduce command. See http://dochub.mongodb.org/core/mapreduce for "
"details.";
}
/**
* The mapReduce command supports only 'local' and 'available' readConcern levels.
* For aggregation-based mapReduce there are no known restrictions to broader support, but work
* would need to be done confirm support for both command and aggregation stages as is done for
* the aggregate command.
*/
virtual ReadConcernSupportResult supportsReadConcern(const BSONObj& cmdObj,
repl::ReadConcernLevel level) const {
static const Status kReadConcernNotSupported{ErrorCodes::InvalidOptions,
"read concern not supported"};
static const Status kDefaultReadConcernNotPermitted{ErrorCodes::InvalidOptions,
"default read concern not permitted"};
return {{level != repl::ReadConcernLevel::kLocalReadConcern &&
level != repl::ReadConcernLevel::kAvailableReadConcern,
kReadConcernNotSupported},
{kDefaultReadConcernNotPermitted}};
}
virtual bool supportsWriteConcern(const BSONObj& cmd) const override {
return map_reduce_common::mrSupportsWriteConcern(cmd);
}
bool allowsAfterClusterTime(const BSONObj& cmd) const override {
return false;
}
bool canIgnorePrepareConflicts() const override {
// Map-Reduce is a special case for prepare conflicts. It may do writes to an output
// collection, but it enables enforcement of prepare conflicts before doing so. See use of
// EnforcePrepareConflictsBlock.
return true;
}
virtual void addRequiredPrivileges(const std::string& dbname,
const BSONObj& cmdObj,
std::vector<Privilege>* out) const {
map_reduce_common::addPrivilegesRequiredForMapReduce(this, dbname, cmdObj, out);
}
virtual void _explainImpl(OperationContext* opCtx,
const BSONObj& cmd,
BSONObjBuilder& result,
boost::optional<ExplainOptions::Verbosity> verbosity) const = 0;
Status explain(OperationContext* opCtx,
const OpMsgRequest& request,
ExplainOptions::Verbosity verbosity,
rpc::ReplyBuilderInterface* result) const override {
if (serverGlobalParams.featureCompatibility.getVersion() ==
ServerGlobalParams::FeatureCompatibility::Version::kFullyUpgradedTo44) {
auto builder = result->getBodyBuilder();
auto explain = boost::make_optional(verbosity);
try {
_explainImpl(opCtx, request.body, builder, explain);
} catch (...) {
return exceptionToStatus();
}
return Status::OK();
} else {
return Status(
ErrorCodes::IllegalOperation,
"explain for mapReduce is not available prior to featureCompatibilityVersion 4.4");
}
MONGO_UNREACHABLE;
}
bool errmsgRun(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmd,
std::string& errmsg,
BSONObjBuilder& result) {
return _runImpl(opCtx, dbname, cmd, errmsg, result);
}
private:
virtual bool _runImpl(OperationContext* opCtx,
const std::string& dbname,
const BSONObj& cmd,
std::string& errmsg,
BSONObjBuilder& result) = 0;
};
} // namespace mongo
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