unsigned long long PerformanceTiming::responseStart() const {
ResourceLoadTiming* timing = resourceLoadTiming();
if (!timing || timing->receiveHeadersEnd() == 0.0)
return requestStart();
// FIXME: Response start needs to be the time of the first received byte.
// However, the ResourceLoadTiming API currently only supports the time
// the last header byte was received. For many responses with reasonable
// sized cookies, the HTTP headers fit into a single packet so this time
// is basically equivalent. But for some responses, particularly those with
// headers larger than a single packet, this time will be too late.
return monotonicTimeToIntegerMilliseconds(timing->receiveHeadersEnd());
}
void PerformanceBase::addResourceTiming(const ResourceTimingInfo& info) {
if (isResourceTimingBufferFull() &&
!hasObserverFor(PerformanceEntry::Resource))
return;
SecurityOrigin* securityOrigin = nullptr;
ExecutionContext* context = getExecutionContext();
if (context)
securityOrigin = context->getSecurityOrigin();
if (!securityOrigin)
return;
const ResourceResponse& finalResponse = info.finalResponse();
bool allowTimingDetails =
passesTimingAllowCheck(finalResponse, *securityOrigin,
info.originalTimingAllowOrigin(), context);
double startTime = info.initialTime();
if (info.redirectChain().isEmpty()) {
PerformanceEntry* entry = PerformanceResourceTiming::create(
info, timeOrigin(), startTime, allowTimingDetails);
notifyObserversOfEntry(*entry);
if (!isResourceTimingBufferFull())
addResourceTimingBuffer(*entry);
return;
}
const Vector<ResourceResponse>& redirectChain = info.redirectChain();
bool allowRedirectDetails = allowsTimingRedirect(redirectChain, finalResponse,
*securityOrigin, context);
if (!allowRedirectDetails) {
ResourceLoadTiming* finalTiming = finalResponse.resourceLoadTiming();
ASSERT(finalTiming);
if (finalTiming)
startTime = finalTiming->requestTime();
}
ResourceLoadTiming* lastRedirectTiming =
redirectChain.back().resourceLoadTiming();
ASSERT(lastRedirectTiming);
double lastRedirectEndTime = lastRedirectTiming->receiveHeadersEnd();
PerformanceEntry* entry = PerformanceResourceTiming::create(
info, timeOrigin(), startTime, lastRedirectEndTime, allowTimingDetails,
allowRedirectDetails);
notifyObserversOfEntry(*entry);
if (!isResourceTimingBufferFull())
addResourceTimingBuffer(*entry);
}
