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/*-
* Public Domain 2014-present MongoDB, Inc.
* Public Domain 2008-2014 WiredTiger, Inc.
*
* This is free and unencumbered software released into the public domain.
*
* Anyone is free to copy, modify, publish, use, compile, sell, or
* distribute this software, either in source code form or as a compiled
* binary, for any purpose, commercial or non-commercial, and by any
* means.
*
* In jurisdictions that recognize copyright laws, the author or authors
* of this software dedicate any and all copyright interest in the
* software to the public domain. We make this dedication for the benefit
* of the public at large and to the detriment of our heirs and
* successors. We intend this dedication to be an overt act of
* relinquishment in perpetuity of all present and future rights to this
* software under copyright law.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
* IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
* OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
* ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
#include "random_generator.h"
#include <algorithm>
extern "C" {
#include "test_util.h"
}
namespace test_harness {
random_generator &
random_generator::instance()
{
thread_local random_generator _instance;
return (_instance);
}
std::string
random_generator::generate_random_string(std::size_t length, characters_type type)
{
std::string str;
while (str.size() < length)
str += get_characters(type);
std::shuffle(str.begin(), str.end(), _generator);
return (str.substr(0, length));
}
std::string
random_generator::generate_pseudo_random_string(std::size_t length, characters_type type)
{
std::string random_string;
std::uniform_int_distribution<> &distribution = get_distribution(type);
std::size_t start_location = distribution(_generator);
const std::string &characters = get_characters(type);
for (std::size_t i = 0; i < length; ++i) {
random_string += characters[start_location];
if (start_location == characters.size() - 1)
start_location = 0;
else
start_location++;
}
return (random_string);
}
random_generator::random_generator()
{
_generator = std::mt19937(std::random_device{}());
_alphanum_distrib = std::uniform_int_distribution<>(0, _pseudo_alphanum.size() - 1);
_alpha_distrib = std::uniform_int_distribution<>(0, _alphabet.size() - 1);
}
std::uniform_int_distribution<> &
random_generator::get_distribution(characters_type type)
{
switch (type) {
case characters_type::ALPHABET:
return (_alpha_distrib);
break;
case characters_type::PSEUDO_ALPHANUMERIC:
return (_alphanum_distrib);
break;
default:
testutil_die(type, "Unexpected characters_type");
break;
}
}
const std::string &
random_generator::get_characters(characters_type type)
{
switch (type) {
case characters_type::ALPHABET:
return (_alphabet);
break;
case characters_type::PSEUDO_ALPHANUMERIC:
return (_pseudo_alphanum);
break;
default:
testutil_die(type, "Unexpected characters_type");
break;
}
}
} // namespace test_harness
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