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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
* You can obtain one at http://mozilla.org/MPL/2.0/. */
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
#include "RTCStatsIdGenerator.h"
#include "mozilla/RandomNum.h"
#include <iostream>
namespace mozilla {
RTCStatsIdGenerator::RTCStatsIdGenerator()
: mSalt(RandomUint64().valueOr(0xa5a5a5a5)), mCounter(0) {}
nsString RTCStatsIdGenerator::Id(const nsString& aKey) {
if (!aKey.Length()) {
MOZ_ASSERT(aKey.Length(), "Stats IDs should never be empty.");
return aKey;
}
if (mAllocated.find(aKey) == mAllocated.end()) {
mAllocated[aKey] = Generate();
}
return mAllocated[aKey];
}
nsString RTCStatsIdGenerator::Generate() {
auto random = RandomUint64().valueOr(0x1a22);
auto idNum = static_cast<uint32_t>(mSalt ^ ((mCounter++ << 16) | random));
nsString id;
id.AppendInt(idNum, 16); // Append as hex
return id;
}
} // namespace mozilla
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