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/**
* Copyright (C) 2018-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/repl/idempotency_scalar_generator.h"
#include <vector>
#include "mongo/bson/bsonobj.h"
#include "mongo/bson/bsonobjbuilder.h"
#include "mongo/db/pipeline/value.h"
namespace mongo {
Value TrivialScalarGenerator::generateScalar() const {
return Value(0);
}
RandomizedScalarGenerator::RandomizedScalarGenerator(PseudoRandom random) : _random(random) {}
Value RandomizedScalarGenerator::generateScalar() const {
auto randomInt = this->_random.nextInt32(static_cast<int32_t>(ScalarChoice::kNumChoices));
auto choice = static_cast<ScalarChoice>(randomInt);
auto randomBit = this->_random.nextInt32(2);
auto multiplier = randomBit == 1 ? 1 : -1;
switch (choice) {
case ScalarChoice::kNull:
return Value(BSONNULL);
case ScalarChoice::kBool:
return Value(randomBit == 1);
case ScalarChoice::kDouble:
return Value(this->_random.nextCanonicalDouble() * INT_MAX * multiplier);
case ScalarChoice::kInteger:
return Value(this->_random.nextInt32(INT_MAX) * multiplier);
case ScalarChoice::kString:
return Value(_generateRandomString());
case ScalarChoice::kNumChoices:
MONGO_UNREACHABLE
}
MONGO_UNREACHABLE;
}
std::string RandomizedScalarGenerator::_generateRandomString() const {
const std::size_t kMaxStrLength = 500;
const StringData kViableChars =
"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
"abcdefghijklmnopqrstuvwxyz"
"0123456789"
"$.\0"_sd;
std::size_t randomStrLength = this->_random.nextInt32(kMaxStrLength);
std::string randomStr(randomStrLength, '\0');
for (std::size_t i = 0; i < randomStrLength; i++) {
randomStr[i] = kViableChars[this->_random.nextInt32(kViableChars.size())];
}
return randomStr;
}
} // namespace mongo
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