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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 "Worker.h"
#include "MessageEventRunnable.h"
#include "mozilla/dom/WorkerBinding.h"
#include "mozilla/ProfilerLabels.h"
#include "mozilla/ProfilerMarkers.h"
#include "mozilla/Unused.h"
#include "nsContentUtils.h"
#include "nsGlobalWindowInner.h"
#include "WorkerPrivate.h"
#include "EventWithOptionsRunnable.h"
#include "js/RootingAPI.h"
#include "mozilla/dom/BindingDeclarations.h"
#include "nsISupports.h"
#include "nsDebug.h"
#include "mozilla/dom/WorkerStatus.h"
#include "mozilla/RefPtr.h"
#ifdef XP_WIN
# undef PostMessage
#endif
namespace mozilla::dom {
/* static */
already_AddRefed<Worker> Worker::Constructor(const GlobalObject& aGlobal,
const nsAString& aScriptURL,
const WorkerOptions& aOptions,
ErrorResult& aRv) {
JSContext* cx = aGlobal.Context();
nsCOMPtr<nsIGlobalObject> globalObject =
do_QueryInterface(aGlobal.GetAsSupports());
if (globalObject->GetAsInnerWindow() &&
!globalObject->GetAsInnerWindow()->IsCurrentInnerWindow()) {
aRv.ThrowInvalidStateError(
"Cannot create worker for a going to be discarded document");
return nullptr;
}
RefPtr<WorkerPrivate> workerPrivate = WorkerPrivate::Constructor(
cx, aScriptURL, false /* aIsChromeWorker */, WorkerKindDedicated,
aOptions.mCredentials, aOptions.mType, aOptions.mName, VoidCString(),
nullptr /*aLoadInfo */, aRv);
if (NS_WARN_IF(aRv.Failed())) {
return nullptr;
}
RefPtr<Worker> worker = new Worker(globalObject, workerPrivate.forget());
return worker.forget();
}
Worker::Worker(nsIGlobalObject* aGlobalObject,
already_AddRefed<WorkerPrivate> aWorkerPrivate)
: DOMEventTargetHelper(aGlobalObject),
mWorkerPrivate(std::move(aWorkerPrivate)) {
MOZ_ASSERT(mWorkerPrivate);
mWorkerPrivate->SetParentEventTargetRef(this);
}
Worker::~Worker() { Terminate(); }
JSObject* Worker::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
JS::Rooted<JSObject*> wrapper(aCx,
Worker_Binding::Wrap(aCx, this, aGivenProto));
if (wrapper) {
// Most DOM objects don't assume they have a reflector. If they don't have
// one and need one, they create it. But in workers code, we assume that the
// reflector is always present. In order to guarantee that it's always
// present, we have to preserve it. Otherwise the GC will happily collect it
// as needed.
MOZ_ALWAYS_TRUE(TryPreserveWrapper(wrapper));
}
return wrapper;
}
bool Worker::IsEligibleForMessaging() {
NS_ASSERT_OWNINGTHREAD(Worker);
return mWorkerPrivate && mWorkerPrivate->ParentStatusProtected() <= Running;
}
void Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Sequence<JSObject*>& aTransferable,
ErrorResult& aRv) {
NS_ASSERT_OWNINGTHREAD(Worker);
if (!mWorkerPrivate || mWorkerPrivate->ParentStatusProtected() > Running) {
return;
}
RefPtr<WorkerPrivate> workerPrivate = mWorkerPrivate;
Unused << workerPrivate;
JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
&transferable);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
NS_ConvertUTF16toUTF8 nameOrScriptURL(
mWorkerPrivate->WorkerName().IsEmpty()
? Substring(
mWorkerPrivate->ScriptURL(), 0,
std::min(size_t(1024), mWorkerPrivate->ScriptURL().Length()))
: Substring(
mWorkerPrivate->WorkerName(), 0,
std::min(size_t(1024), mWorkerPrivate->WorkerName().Length())));
AUTO_PROFILER_MARKER_TEXT("Worker.postMessage", DOM, {}, nameOrScriptURL);
uint32_t flags = uint32_t(js::ProfilingStackFrame::Flags::RELEVANT_FOR_JS);
if (mWorkerPrivate->IsChromeWorker()) {
flags |= uint32_t(js::ProfilingStackFrame::Flags::NONSENSITIVE);
}
mozilla::AutoProfilerLabel PROFILER_RAII(
"Worker.postMessage", nameOrScriptURL.get(),
JS::ProfilingCategoryPair::DOM, flags);
RefPtr<MessageEventRunnable> runnable =
new MessageEventRunnable(mWorkerPrivate, WorkerRunnable::WorkerThread);
JS::CloneDataPolicy clonePolicy;
// DedicatedWorkers are always part of the same agent cluster.
clonePolicy.allowIntraClusterClonableSharedObjects();
if (NS_IsMainThread()) {
nsGlobalWindowInner* win = nsContentUtils::IncumbentInnerWindow();
if (win && win->IsSharedMemoryAllowed()) {
clonePolicy.allowSharedMemoryObjects();
}
} else {
WorkerPrivate* worker = GetCurrentThreadWorkerPrivate();
if (worker && worker->IsSharedMemoryAllowed()) {
clonePolicy.allowSharedMemoryObjects();
}
}
runnable->Write(aCx, aMessage, transferable, clonePolicy, aRv);
if (!mWorkerPrivate || mWorkerPrivate->ParentStatusProtected() > Running) {
return;
}
if (NS_WARN_IF(aRv.Failed())) {
return;
}
// The worker could have closed between the time we entered this function and
// checked ParentStatusProtected and now, which could cause the dispatch to
// fail.
Unused << NS_WARN_IF(!runnable->Dispatch());
}
void Worker::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const StructuredSerializeOptions& aOptions,
ErrorResult& aRv) {
PostMessage(aCx, aMessage, aOptions.mTransfer, aRv);
}
void Worker::PostEventWithOptions(JSContext* aCx,
JS::Handle<JS::Value> aOptions,
const Sequence<JSObject*>& aTransferable,
EventWithOptionsRunnable* aRunnable,
ErrorResult& aRv) {
NS_ASSERT_OWNINGTHREAD(Worker);
if (NS_WARN_IF(!mWorkerPrivate ||
mWorkerPrivate->ParentStatusProtected() > Running)) {
return;
}
RefPtr<WorkerPrivate> workerPrivate = mWorkerPrivate;
Unused << workerPrivate;
aRunnable->InitOptions(aCx, aOptions, aTransferable, aRv);
if (NS_WARN_IF(!mWorkerPrivate ||
mWorkerPrivate->ParentStatusProtected() > Running)) {
return;
}
if (NS_WARN_IF(aRv.Failed())) {
return;
}
Unused << NS_WARN_IF(!aRunnable->Dispatch());
}
void Worker::Terminate() {
NS_ASSERT_OWNINGTHREAD(Worker);
if (mWorkerPrivate) {
mWorkerPrivate->Cancel();
mWorkerPrivate = nullptr;
}
}
NS_IMPL_CYCLE_COLLECTION_CLASS(Worker)
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
if (tmp->mWorkerPrivate) {
tmp->mWorkerPrivate->Traverse(cb);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
tmp->Terminate();
NS_IMPL_CYCLE_COLLECTION_UNLINK_WEAK_PTR
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRACE_BEGIN_INHERITED(Worker, DOMEventTargetHelper)
NS_IMPL_CYCLE_COLLECTION_TRACE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(Worker)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(Worker, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(Worker, DOMEventTargetHelper)
} // namespace mozilla::dom
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