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/*
* Copyright 2018 The WebRTC project authors. All Rights Reserved.
*
* Use of this source code is governed by a BSD-style license
* that can be found in the LICENSE file in the root of the source
* tree. An additional intellectual property rights grant can be found
* in the file PATENTS. All contributing project authors may
* be found in the AUTHORS file in the root of the source tree.
*/
#include "rtc_base/unique_id_generator.h"
#include <cstdint>
#include <limits>
#include <optional>
#include <string>
#include "absl/strings/str_cat.h"
#include "absl/strings/string_view.h"
#include "api/array_view.h"
#include "rtc_base/checks.h"
#include "rtc_base/crypto_random.h"
#include "rtc_base/string_to_number.h"
#include "rtc_base/synchronization/mutex.h"
namespace webrtc {
UniqueRandomIdGenerator::UniqueRandomIdGenerator() : known_ids_() {}
UniqueRandomIdGenerator::UniqueRandomIdGenerator(ArrayView<uint32_t> known_ids)
: known_ids_(known_ids.begin(), known_ids.end()) {}
UniqueRandomIdGenerator::~UniqueRandomIdGenerator() = default;
uint32_t UniqueRandomIdGenerator::GenerateId() {
MutexLock lock(&mutex_);
RTC_CHECK_LT(known_ids_.size(), std::numeric_limits<uint32_t>::max() - 1);
while (true) {
auto pair = known_ids_.insert(CreateRandomNonZeroId());
if (pair.second) {
return *pair.first;
}
}
}
bool UniqueRandomIdGenerator::AddKnownId(uint32_t value) {
MutexLock lock(&mutex_);
return known_ids_.insert(value).second;
}
UniqueStringGenerator::UniqueStringGenerator() : unique_number_generator_() {}
UniqueStringGenerator::UniqueStringGenerator(ArrayView<std::string> known_ids) {
for (const std::string& str : known_ids) {
AddKnownId(str);
}
}
UniqueStringGenerator::~UniqueStringGenerator() = default;
std::string UniqueStringGenerator::GenerateString() {
return absl::StrCat(unique_number_generator_.GenerateNumber());
}
bool UniqueStringGenerator::AddKnownId(absl::string_view value) {
// TODO(webrtc:13579): remove string copy here once absl::string_view version
// of StringToNumber is available.
std::optional<uint32_t> int_value =
StringToNumber<uint32_t>(std::string(value));
// The underlying generator works for uint32_t values, so if the provided
// value is not a uint32_t it will never be generated anyway.
if (int_value.has_value()) {
return unique_number_generator_.AddKnownId(int_value.value());
}
return false;
}
} // namespace webrtc
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