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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,
/* -*- 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 "RTCStatsReport.h"
#include "WebrtcGlobal.h"
namespace mozilla {
RTCStatsIdGenerator::RTCStatsIdGenerator()
: mSalt(RandomUint64().valueOr(0xa5a5a5a5)), mCounter(0) {}
void RTCStatsIdGenerator::RewriteIds(
nsTArray<UniquePtr<dom::RTCStatsCollection>> aFromStats,
dom::RTCStatsCollection* aIntoReport) {
// Rewrite an Optional id
auto rewriteId = [&](dom::Optional<nsString>& id) {
if (id.WasPassed()) {
id.Value() = Id(id.Value());
}
};
auto rewriteIds = [&](auto& aList, auto... aParam) {
for (auto& stat : aList) {
(rewriteId(stat.*aParam), ...);
}
};
// Involves a lot of copying, since webidl dictionaries don't have
// move semantics. Oh well.
// Create a temporary to avoid double-rewriting any stats already in
// aIntoReport.
auto stats = MakeUnique<dom::RTCStatsCollection>();
dom::FlattenStats(std::move(aFromStats), stats.get());
using S = dom::RTCStats;
using ICPS = dom::RTCIceCandidatePairStats;
using RSS = dom::RTCRtpStreamStats;
using IRSS = dom::RTCInboundRtpStreamStats;
using ORSS = dom::RTCOutboundRtpStreamStats;
using RIRSS = dom::RTCRemoteInboundRtpStreamStats;
using RORSS = dom::RTCRemoteOutboundRtpStreamStats;
rewriteIds(stats->mIceCandidatePairStats, &S::mId, &ICPS::mLocalCandidateId,
&ICPS::mRemoteCandidateId);
rewriteIds(stats->mIceCandidateStats, &S::mId);
rewriteIds(stats->mInboundRtpStreamStats, &S::mId, &IRSS::mRemoteId,
&RSS::mCodecId);
rewriteIds(stats->mOutboundRtpStreamStats, &S::mId, &ORSS::mRemoteId,
&RSS::mCodecId);
rewriteIds(stats->mRemoteInboundRtpStreamStats, &S::mId, &RIRSS::mLocalId,
&RSS::mCodecId);
rewriteIds(stats->mRemoteOutboundRtpStreamStats, &S::mId, &RORSS::mLocalId,
&RSS::mCodecId);
rewriteIds(stats->mCodecStats, &S::mId);
rewriteIds(stats->mRtpContributingSourceStats, &S::mId);
rewriteIds(stats->mTrickledIceCandidateStats, &S::mId);
rewriteIds(stats->mDataChannelStats, &S::mId);
dom::MergeStats(std::move(stats), aIntoReport);
}
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