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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 "SerializedStackHolder.h"
#include "js/SavedFrameAPI.h"
#include "mozilla/dom/WorkerPrivate.h"
#include "nsJSPrincipals.h"
namespace mozilla::dom {
SerializedStackHolder::SerializedStackHolder()
: mHolder(StructuredCloneHolder::CloningSupported,
StructuredCloneHolder::TransferringNotSupported,
StructuredCloneHolder::StructuredCloneScope::SameProcess) {}
void SerializedStackHolder::WriteStack(JSContext* aCx,
JS::HandleObject aStack) {
JS::RootedValue stackValue(aCx, JS::ObjectValue(*aStack));
mHolder.Write(aCx, stackValue, IgnoreErrors());
// StructuredCloneHolder::Write can leave a pending exception on the context.
JS_ClearPendingException(aCx);
}
void SerializedStackHolder::SerializeMainThreadOrWorkletStack(
JSContext* aCx, JS::HandleObject aStack) {
MOZ_ASSERT(!IsCurrentThreadRunningWorker());
WriteStack(aCx, aStack);
}
void SerializedStackHolder::SerializeWorkerStack(JSContext* aCx,
WorkerPrivate* aWorkerPrivate,
JS::HandleObject aStack) {
MOZ_ASSERT(aWorkerPrivate->IsOnCurrentThread());
RefPtr<StrongWorkerRef> workerRef =
StrongWorkerRef::Create(aWorkerPrivate, "WorkerErrorReport");
if (workerRef) {
mWorkerRef = new ThreadSafeWorkerRef(workerRef);
} else {
// Don't write the stack if we can't create a ref to the worker.
return;
}
WriteStack(aCx, aStack);
}
void SerializedStackHolder::SerializeCurrentStack(JSContext* aCx) {
JS::RootedObject stack(aCx);
if (JS::CurrentGlobalOrNull(aCx) && !JS::CaptureCurrentStack(aCx, &stack)) {
JS_ClearPendingException(aCx);
return;
}
if (stack) {
if (NS_IsMainThread()) {
SerializeMainThreadOrWorkletStack(aCx, stack);
} else {
WorkerPrivate* currentWorker = GetCurrentThreadWorkerPrivate();
SerializeWorkerStack(aCx, currentWorker, stack);
}
}
}
JSObject* SerializedStackHolder::ReadStack(JSContext* aCx) {
MOZ_ASSERT(NS_IsMainThread());
if (!mHolder.HasData()) {
return nullptr;
}
JS::RootedValue stackValue(aCx);
{
Maybe<nsJSPrincipals::AutoSetActiveWorkerPrincipal> set;
if (mWorkerRef) {
set.emplace(mWorkerRef->Private()->GetPrincipal());
}
mHolder.Read(xpc::CurrentNativeGlobal(aCx), aCx, &stackValue,
IgnoreErrors());
}
return stackValue.isObject() ? &stackValue.toObject() : nullptr;
}
UniquePtr<SerializedStackHolder> GetCurrentStackForNetMonitor(JSContext* aCx) {
MOZ_ASSERT_IF(!NS_IsMainThread(),
GetCurrentThreadWorkerPrivate()->IsWatchedByDevTools());
UniquePtr<SerializedStackHolder> stack = MakeUnique<SerializedStackHolder>();
stack->SerializeCurrentStack(aCx);
return stack;
}
void NotifyNetworkMonitorAlternateStack(
nsISupports* aChannel, UniquePtr<SerializedStackHolder> aStackHolder) {
if (!aStackHolder) {
return;
}
nsString stackString;
ConvertSerializedStackToJSON(std::move(aStackHolder), stackString);
if (!stackString.IsEmpty()) {
NotifyNetworkMonitorAlternateStack(aChannel, stackString);
}
}
void ConvertSerializedStackToJSON(UniquePtr<SerializedStackHolder> aStackHolder,
nsAString& aStackString) {
// We need a JSContext to be able to stringify the SavedFrame stack.
// This will not run any scripts. A privileged scope is needed to fully
// inspect all stack frames we find.
AutoJSAPI jsapi;
DebugOnly<bool> ok = jsapi.Init(xpc::PrivilegedJunkScope());
JSContext* cx = jsapi.cx();
JS::RootedObject savedFrame(cx, aStackHolder->ReadStack(cx));
if (!savedFrame) {
return;
}
JS::RootedObject converted(cx);
converted = JS::ConvertSavedFrameToPlainObject(
cx, savedFrame, JS::SavedFrameSelfHosted::Exclude);
if (!converted) {
JS_ClearPendingException(cx);
return;
}
JS::RootedValue convertedValue(cx, JS::ObjectValue(*converted));
if (!nsContentUtils::StringifyJSON(cx, &convertedValue, aStackString)) {
JS_ClearPendingException(cx);
return;
}
}
void NotifyNetworkMonitorAlternateStack(nsISupports* aChannel,
const nsAString& aStackJSON) {
nsCOMPtr<nsIObserverService> obsService = services::GetObserverService();
if (!obsService) {
return;
}
obsService->NotifyObservers(aChannel, "network-monitor-alternate-stack",
PromiseFlatString(aStackJSON).get());
}
} // namespace mozilla::dom
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