зеркало из https://github.com/mozilla/gecko-dev.git
91 строка
3.0 KiB
C++
91 строка
3.0 KiB
C++
/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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#include "RTCStatsIdGenerator.h"
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#include <iostream>
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#include "mozilla/RandomNum.h"
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#include "RTCStatsReport.h"
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#include "WebrtcGlobal.h"
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namespace mozilla {
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RTCStatsIdGenerator::RTCStatsIdGenerator()
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: mSalt(RandomUint64().valueOr(0xa5a5a5a5)), mCounter(0) {}
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void RTCStatsIdGenerator::RewriteIds(
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nsTArray<UniquePtr<dom::RTCStatsCollection>> aFromStats,
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dom::RTCStatsCollection* aIntoReport) {
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// Rewrite an Optional id
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auto rewriteId = [&](dom::Optional<nsString>& id) {
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if (id.WasPassed()) {
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id.Value() = Id(id.Value());
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}
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};
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auto rewriteIds = [&](auto& aList, auto... aParam) {
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for (auto& stat : aList) {
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(rewriteId(stat.*aParam), ...);
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}
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};
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// Involves a lot of copying, since webidl dictionaries don't have
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// move semantics. Oh well.
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// Create a temporary to avoid double-rewriting any stats already in
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// aIntoReport.
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auto stats = MakeUnique<dom::RTCStatsCollection>();
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dom::FlattenStats(std::move(aFromStats), stats.get());
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using S = dom::RTCStats;
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using ICPS = dom::RTCIceCandidatePairStats;
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using RSS = dom::RTCRtpStreamStats;
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using IRSS = dom::RTCInboundRtpStreamStats;
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using ORSS = dom::RTCOutboundRtpStreamStats;
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using RIRSS = dom::RTCRemoteInboundRtpStreamStats;
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using RORSS = dom::RTCRemoteOutboundRtpStreamStats;
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rewriteIds(stats->mIceCandidatePairStats, &S::mId, &ICPS::mLocalCandidateId,
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&ICPS::mRemoteCandidateId);
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rewriteIds(stats->mIceCandidateStats, &S::mId);
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rewriteIds(stats->mInboundRtpStreamStats, &S::mId, &IRSS::mRemoteId,
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&RSS::mCodecId);
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rewriteIds(stats->mOutboundRtpStreamStats, &S::mId, &ORSS::mRemoteId,
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&RSS::mCodecId);
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rewriteIds(stats->mRemoteInboundRtpStreamStats, &S::mId, &RIRSS::mLocalId,
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&RSS::mCodecId);
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rewriteIds(stats->mRemoteOutboundRtpStreamStats, &S::mId, &RORSS::mLocalId,
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&RSS::mCodecId);
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rewriteIds(stats->mCodecStats, &S::mId);
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rewriteIds(stats->mRtpContributingSourceStats, &S::mId);
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rewriteIds(stats->mTrickledIceCandidateStats, &S::mId);
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rewriteIds(stats->mDataChannelStats, &S::mId);
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dom::MergeStats(std::move(stats), aIntoReport);
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}
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nsString RTCStatsIdGenerator::Id(const nsString& aKey) {
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if (!aKey.Length()) {
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MOZ_ASSERT(aKey.Length(), "Stats IDs should never be empty.");
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return aKey;
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}
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if (mAllocated.find(aKey) == mAllocated.end()) {
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mAllocated[aKey] = Generate();
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}
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return mAllocated[aKey];
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}
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nsString RTCStatsIdGenerator::Generate() {
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auto random = RandomUint64().valueOr(0x1a22);
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auto idNum = static_cast<uint32_t>(mSalt ^ ((mCounter++ << 16) | random));
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nsString id;
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id.AppendInt(idNum, 16); // Append as hex
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return id;
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}
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} // namespace mozilla
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