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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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/. */
#include "nsServerTiming.h"
#include "nsHttp.h"
NS_IMPL_ISUPPORTS(nsServerTiming, nsIServerTiming)
NS_IMETHODIMP
nsServerTiming::GetName(nsACString& aName) {
aName.Assign(mName);
return NS_OK;
}
NS_IMETHODIMP
nsServerTiming::GetDuration(double* aDuration) {
*aDuration = mDuration;
return NS_OK;
}
NS_IMETHODIMP
nsServerTiming::GetDescription(nsACString& aDescription) {
aDescription.Assign(mDescription);
return NS_OK;
}
namespace mozilla {
namespace net {
static double ParseDouble(const nsACString& aString) {
nsresult rv;
double val = PromiseFlatCString(aString).ToDouble(&rv);
return NS_FAILED(rv) ? 0.0f : val;
}
void ServerTimingParser::Parse() {
// https://w3c.github.io/server-timing/#the-server-timing-header-field
// Server-Timing = #server-timing-metric
// server-timing-metric = metric-name *( OWS ";" OWS server-timing-param
// ) metric-name = token server-timing-param =
// server-timing-param-name OWS "=" OWS
// server-timing-param-value
// server-timing-param-name = token
// server-timing-param-value = token / quoted-string
ParsedHeaderValueListList parsedHeader(mValue, false);
for (uint32_t index = 0; index < parsedHeader.mValues.Length(); ++index) {
if (parsedHeader.mValues[index].mValues.IsEmpty()) {
continue;
}
// According to spec, the first ParsedHeaderPair's name is metric-name.
RefPtr<nsServerTiming> timingHeader = new nsServerTiming();
mServerTimingHeaders.AppendElement(timingHeader);
timingHeader->SetName(parsedHeader.mValues[index].mValues[0].mName);
if (parsedHeader.mValues[index].mValues.Length() == 1) {
continue;
}
// Try to find duration and description from the rest ParsedHeaderPairs.
bool foundDuration = false;
bool foundDescription = false;
for (uint32_t pairIndex = 1;
pairIndex < parsedHeader.mValues[index].mValues.Length();
++pairIndex) {
nsDependentCSubstring& currentName =
parsedHeader.mValues[index].mValues[pairIndex].mName;
nsDependentCSubstring& currentValue =
parsedHeader.mValues[index].mValues[pairIndex].mValue;
// We should only take the value from the first
// occurrence of server-timing-param-name ("dur" and "desc").
// This is true whether or not the value makes any sense (or, indeed, if
// there even is a value).
if (currentName.LowerCaseEqualsASCII("dur") && !foundDuration) {
if (currentValue.BeginReading()) {
timingHeader->SetDuration(ParseDouble(currentValue));
} else {
timingHeader->SetDuration(0.0);
}
foundDuration = true;
} else if (currentName.LowerCaseEqualsASCII("desc") &&
!foundDescription) {
if (!currentValue.IsEmpty()) {
timingHeader->SetDescription(currentValue);
} else {
timingHeader->SetDescription(""_ns);
}
foundDescription = true;
}
if (foundDuration && foundDescription) {
break;
}
}
}
}
nsTArray<nsCOMPtr<nsIServerTiming>>&&
ServerTimingParser::TakeServerTimingHeaders() {
return std::move(mServerTimingHeaders);
}
} // namespace net
} // namespace mozilla
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