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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.
*/
#include <string>
#include <utility>
#include "mongo/db/commands/map_reduce_out_options.h"
namespace mongo {
using namespace std::string_literals;
MapReduceOutOptions MapReduceOutOptions::parseFromBSON(const BSONElement& element) {
if (element.type() == BSONType::String) {
return MapReduceOutOptions("", element.str(), OutputType::Replace, false);
} else if (element.type() == BSONType::Object) {
const auto obj = element.embeddedObject();
// The inline option is allowed alone.
if (const auto inMemory = obj["inline"]) {
uassert(ErrorCodes::BadValue, "'inline' must be specified alone", obj.nFields() == 1);
uassert(
ErrorCodes::BadValue, "'inline' takes only numeric '1'", inMemory.number() == 1.0);
return MapReduceOutOptions("", "", OutputType::InMemory, false);
}
int allowedNFields = 3;
const auto sharded = [&]() {
if (const auto sharded = obj["sharded"]) {
uassert(ErrorCodes::BadValue,
"sharded field value must be boolean",
sharded.type() == Bool);
return sharded.boolean();
} else {
--allowedNFields;
return false;
}
}();
const auto databaseName = [&]() {
if (const auto db = obj["db"]) {
uassert(ErrorCodes::BadValue,
"db field value must be string",
db.type() == BSONType::String);
return db.str();
} else {
--allowedNFields;
return ""s;
}
}();
const auto [collectionName, outputType] = [&]() {
auto stringOrError = [](auto&& element) {
uassert(ErrorCodes::BadValue,
"'"s + element.fieldName() +
"' supports only string consisting of output collection name",
element.type() == BSONType::String);
return element.str();
};
if (const auto replace = obj["replace"])
return std::pair{stringOrError(replace), OutputType::Replace};
else if (const auto merge = obj["merge"])
return std::pair{stringOrError(merge), OutputType::Merge};
else if (const auto reduce = obj["reduce"])
return std::pair{stringOrError(reduce), OutputType::Reduce};
else
uasserted(ErrorCodes::BadValue, "'out' requires 'replace', 'merge' or 'reduce'");
}();
uassert(ErrorCodes::BadValue,
"'out' supports only output type with collection name, optional 'sharded' and "
"optional 'db'",
obj.nFields() == allowedNFields);
return MapReduceOutOptions(
std::move(databaseName), std::move(collectionName), outputType, sharded);
} else {
uasserted(ErrorCodes::BadValue, "'out' must be either a string or an object");
}
}
} // namespace mongo
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