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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 "MessagePort.h"
#include "MessageEvent.h"
#include "MessagePortChild.h"
#include "mozilla/dom/BlobBinding.h"
#include "mozilla/dom/Event.h"
#include "mozilla/dom/File.h"
#include "mozilla/dom/MessageChannel.h"
#include "mozilla/dom/MessageEventBinding.h"
#include "mozilla/dom/MessagePortBinding.h"
#include "mozilla/dom/MessagePortChild.h"
#include "mozilla/dom/PMessagePort.h"
#include "mozilla/dom/ScriptSettings.h"
#include "mozilla/dom/StructuredCloneTags.h"
#include "mozilla/dom/WorkerRef.h"
#include "mozilla/dom/WorkerScope.h"
#include "mozilla/ipc/BackgroundChild.h"
#include "mozilla/dom/RefMessageBodyService.h"
#include "mozilla/dom/SharedMessageBody.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/MessagePortTimelineMarker.h"
#include "mozilla/ScopeExit.h"
#include "mozilla/TimelineConsumers.h"
#include "mozilla/TimelineMarker.h"
#include "mozilla/Unused.h"
#include "nsContentUtils.h"
#include "nsGlobalWindow.h"
#include "nsPresContext.h"
#include "nsIBFCacheEntry.h"
#include "mozilla/dom/Document.h"
#include "nsServiceManagerUtils.h"
#ifdef XP_WIN
# undef PostMessage
#endif
namespace mozilla {
namespace dom {
void UniqueMessagePortId::ForceClose() {
if (!mIdentifier.neutered()) {
MessagePort::ForceClose(mIdentifier);
mIdentifier.neutered() = true;
}
}
class PostMessageRunnable final : public CancelableRunnable {
friend class MessagePort;
public:
PostMessageRunnable(MessagePort* aPort, SharedMessageBody* aData)
: CancelableRunnable("dom::PostMessageRunnable"),
mPort(aPort),
mData(aData) {
MOZ_ASSERT(aPort);
MOZ_ASSERT(aData);
}
NS_IMETHOD
Run() override {
NS_ASSERT_OWNINGTHREAD(Runnable);
// The port can be cycle collected while this runnable is pending in
// the event queue.
if (!mPort) {
return NS_OK;
}
MOZ_ASSERT(mPort->mPostMessageRunnable == this);
DispatchMessage();
// We must check if we were waiting for this message in order to shutdown
// the port.
mPort->UpdateMustKeepAlive();
mPort->mPostMessageRunnable = nullptr;
mPort->Dispatch();
return NS_OK;
}
nsresult Cancel() override {
NS_ASSERT_OWNINGTHREAD(Runnable);
mPort = nullptr;
mData = nullptr;
return NS_OK;
}
private:
void DispatchMessage() const {
NS_ASSERT_OWNINGTHREAD(Runnable);
if (NS_FAILED(mPort->CheckCurrentGlobalCorrectness())) {
return;
}
nsCOMPtr<nsIGlobalObject> globalObject = mPort->GetParentObject();
AutoJSAPI jsapi;
if (!globalObject || !jsapi.Init(globalObject)) {
NS_WARNING("Failed to initialize AutoJSAPI object.");
return;
}
JSContext* cx = jsapi.cx();
IgnoredErrorResult rv;
JS::Rooted<JS::Value> value(cx);
UniquePtr<AbstractTimelineMarker> start;
UniquePtr<AbstractTimelineMarker> end;
RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
bool isTimelineRecording = timelines && !timelines->IsEmpty();
if (isTimelineRecording) {
start = MakeUnique<MessagePortTimelineMarker>(
ProfileTimelineMessagePortOperationType::DeserializeData,
MarkerTracingType::START);
}
mData->Read(cx, &value, mPort->mRefMessageBodyService,
SharedMessageBody::ReadMethod::StealRefMessageBody, rv);
if (isTimelineRecording) {
end = MakeUnique<MessagePortTimelineMarker>(
ProfileTimelineMessagePortOperationType::DeserializeData,
MarkerTracingType::END);
timelines->AddMarkerForAllObservedDocShells(start);
timelines->AddMarkerForAllObservedDocShells(end);
}
if (NS_WARN_IF(rv.Failed())) {
JS_ClearPendingException(cx);
mPort->DispatchError();
return;
}
// Create the event
nsCOMPtr<mozilla::dom::EventTarget> eventTarget =
do_QueryInterface(mPort->GetOwner());
RefPtr<MessageEvent> event =
new MessageEvent(eventTarget, nullptr, nullptr);
Sequence<OwningNonNull<MessagePort>> ports;
if (!mData->TakeTransferredPortsAsSequence(ports)) {
mPort->DispatchError();
return;
}
event->InitMessageEvent(nullptr, NS_LITERAL_STRING("message"),
CanBubble::eNo, Cancelable::eNo, value,
EmptyString(), EmptyString(), nullptr, ports);
event->SetTrusted(true);
mPort->DispatchEvent(*event);
}
private:
~PostMessageRunnable() = default;
RefPtr<MessagePort> mPort;
RefPtr<SharedMessageBody> mData;
};
NS_IMPL_CYCLE_COLLECTION_CLASS(MessagePort)
NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MessagePort,
DOMEventTargetHelper)
if (tmp->mPostMessageRunnable) {
NS_IMPL_CYCLE_COLLECTION_UNLINK(mPostMessageRunnable->mPort);
}
NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessagesForTheOtherPort);
tmp->CloseForced();
NS_IMPL_CYCLE_COLLECTION_UNLINK_END
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MessagePort,
DOMEventTargetHelper)
if (tmp->mPostMessageRunnable) {
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mPostMessageRunnable->mPort);
}
NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mUnshippedEntangledPort);
NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(MessagePort)
NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
NS_IMPL_ADDREF_INHERITED(MessagePort, DOMEventTargetHelper)
NS_IMPL_RELEASE_INHERITED(MessagePort, DOMEventTargetHelper)
MessagePort::MessagePort(nsIGlobalObject* aGlobal, State aState)
: DOMEventTargetHelper(aGlobal),
mRefMessageBodyService(RefMessageBodyService::GetOrCreate()),
mState(aState),
mMessageQueueEnabled(false),
mIsKeptAlive(false),
mHasBeenTransferredOrClosed(false) {
MOZ_ASSERT(aGlobal);
mIdentifier = MakeUnique<MessagePortIdentifier>();
mIdentifier->neutered() = true;
mIdentifier->sequenceId() = 0;
}
MessagePort::~MessagePort() {
CloseForced();
MOZ_ASSERT(!mWorkerRef);
}
/* static */
already_AddRefed<MessagePort> MessagePort::Create(nsIGlobalObject* aGlobal,
const nsID& aUUID,
const nsID& aDestinationUUID,
ErrorResult& aRv) {
MOZ_ASSERT(aGlobal);
RefPtr<MessagePort> mp = new MessagePort(aGlobal, eStateUnshippedEntangled);
mp->Initialize(aUUID, aDestinationUUID, 1 /* 0 is an invalid sequence ID */,
false /* Neutered */, aRv);
return mp.forget();
}
/* static */
already_AddRefed<MessagePort> MessagePort::Create(
nsIGlobalObject* aGlobal, UniqueMessagePortId& aIdentifier,
ErrorResult& aRv) {
MOZ_ASSERT(aGlobal);
RefPtr<MessagePort> mp = new MessagePort(aGlobal, eStateEntangling);
mp->Initialize(aIdentifier.uuid(), aIdentifier.destinationUuid(),
aIdentifier.sequenceId(), aIdentifier.neutered(), aRv);
aIdentifier.neutered() = true;
return mp.forget();
}
void MessagePort::UnshippedEntangle(MessagePort* aEntangledPort) {
MOZ_DIAGNOSTIC_ASSERT(aEntangledPort);
MOZ_DIAGNOSTIC_ASSERT(!mUnshippedEntangledPort);
mUnshippedEntangledPort = aEntangledPort;
}
void MessagePort::Initialize(const nsID& aUUID, const nsID& aDestinationUUID,
uint32_t aSequenceID, bool aNeutered,
ErrorResult& aRv) {
MOZ_ASSERT(mIdentifier);
mIdentifier->uuid() = aUUID;
mIdentifier->destinationUuid() = aDestinationUUID;
mIdentifier->sequenceId() = aSequenceID;
if (aNeutered) {
// If this port is neutered we don't want to keep it alive artificially nor
// we want to add listeners or WorkerRefs.
mState = eStateDisentangled;
return;
}
if (mState == eStateEntangling) {
if (!ConnectToPBackground()) {
aRv.Throw(NS_ERROR_FAILURE);
return;
}
} else {
MOZ_ASSERT(mState == eStateUnshippedEntangled);
}
// The port has to keep itself alive until it's entangled.
UpdateMustKeepAlive();
if (WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate()) {
RefPtr<MessagePort> self = this;
// When the callback is executed, we cannot process messages anymore because
// we cannot dispatch new runnables. Let's force a Close().
RefPtr<StrongWorkerRef> strongWorkerRef = StrongWorkerRef::Create(
workerPrivate, "MessagePort", [self]() { self->CloseForced(); });
if (NS_WARN_IF(!strongWorkerRef)) {
// The worker is shutting down.
mState = eStateDisentangled;
UpdateMustKeepAlive();
aRv.Throw(NS_ERROR_FAILURE);
return;
}
MOZ_ASSERT(!mWorkerRef);
mWorkerRef = std::move(strongWorkerRef);
}
}
JSObject* MessagePort::WrapObject(JSContext* aCx,
JS::Handle<JSObject*> aGivenProto) {
return MessagePort_Binding::Wrap(aCx, this, aGivenProto);
}
void MessagePort::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const Sequence<JSObject*>& aTransferable,
ErrorResult& aRv) {
// We *must* clone the data here, or the JS::Value could be modified
// by script
// Here we want to check if the transerable object list contains
// this port.
for (uint32_t i = 0; i < aTransferable.Length(); ++i) {
JS::Rooted<JSObject*> object(aCx, aTransferable[i]);
if (!object) {
continue;
}
MessagePort* port = nullptr;
nsresult rv = UNWRAP_OBJECT(MessagePort, &object, port);
if (NS_SUCCEEDED(rv) && port == this) {
aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
return;
}
}
JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
aRv = nsContentUtils::CreateJSValueFromSequenceOfObject(aCx, aTransferable,
&transferable);
if (NS_WARN_IF(aRv.Failed())) {
return;
}
Maybe<nsID> agentClusterId;
nsCOMPtr<nsIGlobalObject> global = GetOwnerGlobal();
if (global) {
agentClusterId = global->GetAgentClusterId();
}
RefPtr<SharedMessageBody> data = new SharedMessageBody(
StructuredCloneHolder::TransferringSupported, agentClusterId);
UniquePtr<AbstractTimelineMarker> start;
UniquePtr<AbstractTimelineMarker> end;
RefPtr<TimelineConsumers> timelines = TimelineConsumers::Get();
bool isTimelineRecording = timelines && !timelines->IsEmpty();
if (isTimelineRecording) {
start = MakeUnique<MessagePortTimelineMarker>(
ProfileTimelineMessagePortOperationType::SerializeData,
MarkerTracingType::START);
}
data->Write(aCx, aMessage, transferable, mIdentifier->uuid(),
mRefMessageBodyService, aRv);
if (isTimelineRecording) {
end = MakeUnique<MessagePortTimelineMarker>(
ProfileTimelineMessagePortOperationType::SerializeData,
MarkerTracingType::END);
timelines->AddMarkerForAllObservedDocShells(start);
timelines->AddMarkerForAllObservedDocShells(end);
}
if (NS_WARN_IF(aRv.Failed())) {
return;
}
// This message has to be ignored.
if (mState > eStateEntangled) {
return;
}
// If we are unshipped we are connected to the other port on the same thread.
if (mState == eStateUnshippedEntangled) {
MOZ_DIAGNOSTIC_ASSERT(mUnshippedEntangledPort);
mUnshippedEntangledPort->mMessages.AppendElement(data);
mUnshippedEntangledPort->Dispatch();
return;
}
// Not entangled yet, but already closed/disentangled.
if (mState == eStateEntanglingForDisentangle ||
mState == eStateEntanglingForClose) {
return;
}
RemoveDocFromBFCache();
// Not entangled yet.
if (mState == eStateEntangling) {
mMessagesForTheOtherPort.AppendElement(data);
return;
}
MOZ_ASSERT(mActor);
MOZ_ASSERT(mMessagesForTheOtherPort.IsEmpty());
AutoTArray<RefPtr<SharedMessageBody>, 1> array;
array.AppendElement(data);
AutoTArray<MessageData, 1> messages;
// note: `messages` will borrow the underlying buffer, but this is okay
// because reverse destruction order means `messages` will be destroyed prior
// to `array`/`data`.
SharedMessageBody::FromSharedToMessagesChild(mActor->Manager(), array,
messages);
mActor->SendPostMessages(messages);
}
void MessagePort::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
const PostMessageOptions& aOptions,
ErrorResult& aRv) {
PostMessage(aCx, aMessage, aOptions.mTransfer, aRv);
}
void MessagePort::Start() {
if (mMessageQueueEnabled) {
return;
}
mMessageQueueEnabled = true;
Dispatch();
}
void MessagePort::Dispatch() {
if (!mMessageQueueEnabled || mMessages.IsEmpty() || mPostMessageRunnable) {
return;
}
switch (mState) {
case eStateUnshippedEntangled:
// Everything is fine here. We have messages because the other
// port populates our queue directly.
break;
case eStateEntangling:
// Everything is fine here as well. We have messages because the other
// port populated our queue directly when we were in the
// eStateUnshippedEntangled state.
break;
case eStateEntanglingForDisentangle:
// Here we don't want to ship messages because these messages must be
// delivered by the cloned version of this one. They will be sent in the
// SendDisentangle().
return;
case eStateEntanglingForClose:
// We still want to deliver messages if we are closing. These messages
// are here from the previous eStateUnshippedEntangled state.
break;
case eStateEntangled:
// This port is up and running.
break;
case eStateDisentangling:
// If we are in the process to disentangle the port, we cannot dispatch
// messages. They will be sent to the cloned version of this port via
// SendDisentangle();
return;
case eStateDisentangled:
MOZ_CRASH("This cannot happen.");
// It cannot happen because Disentangle should take off all the pending
// messages.
break;
case eStateDisentangledForClose:
// If we are here is because the port has been closed. We can still
// process the pending messages.
break;
}
RefPtr<SharedMessageBody> data = mMessages.ElementAt(0);
mMessages.RemoveElementAt(0);
mPostMessageRunnable = new PostMessageRunnable(this, data);
nsCOMPtr<nsIGlobalObject> global = GetOwnerGlobal();
if (NS_IsMainThread() && global) {
MOZ_ALWAYS_SUCCEEDS(
global->Dispatch(TaskCategory::Other, do_AddRef(mPostMessageRunnable)));
return;
}
MOZ_ALWAYS_SUCCEEDS(NS_DispatchToCurrentThread(mPostMessageRunnable));
}
void MessagePort::Close() {
mHasBeenTransferredOrClosed = true;
CloseInternal(true /* aSoftly */);
}
void MessagePort::CloseForced() { CloseInternal(false /* aSoftly */); }
void MessagePort::CloseInternal(bool aSoftly) {
// If we have some messages to send but we don't want a 'soft' close, we have
// to flush them now.
if (!aSoftly) {
mMessages.Clear();
}
// Let's inform the RefMessageBodyService that any our shared messages are
// now invalid.
mRefMessageBodyService->ForgetPort(mIdentifier->uuid());
if (mState == eStateUnshippedEntangled) {
MOZ_DIAGNOSTIC_ASSERT(mUnshippedEntangledPort);
// This avoids loops.
RefPtr<MessagePort> port = std::move(mUnshippedEntangledPort);
mState = eStateDisentangledForClose;
port->CloseInternal(aSoftly);
UpdateMustKeepAlive();
return;
}
// Not entangled yet, we have to wait.
if (mState == eStateEntangling) {
mState = eStateEntanglingForClose;
return;
}
// Not entangled but already cloned or closed
if (mState == eStateEntanglingForDisentangle ||
mState == eStateEntanglingForClose) {
return;
}
// Maybe we were already closing the port but softly. In this case we call
// UpdateMustKeepAlive() to consider the empty pending message queue.
if (mState == eStateDisentangledForClose && !aSoftly) {
UpdateMustKeepAlive();
return;
}
if (mState > eStateEntangled) {
return;
}
// We don't care about stopping the sending of messages because from now all
// the incoming messages will be ignored.
mState = eStateDisentangledForClose;
MOZ_ASSERT(mActor);
mActor->SendClose();
mActor->SetPort(nullptr);
mActor = nullptr;
UpdateMustKeepAlive();
}
EventHandlerNonNull* MessagePort::GetOnmessage() {
return GetEventHandler(nsGkAtoms::onmessage);
}
void MessagePort::SetOnmessage(EventHandlerNonNull* aCallback) {
SetEventHandler(nsGkAtoms::onmessage, aCallback);
// When using onmessage, the call to start() is implied.
Start();
}
// This method is called when the PMessagePortChild actor is entangled to
// another actor. It receives a list of messages to be dispatch. It can be that
// we were waiting for this entangling step in order to disentangle the port or
// to close it.
void MessagePort::Entangled(nsTArray<MessageData>& aMessages) {
MOZ_ASSERT(mState == eStateEntangling ||
mState == eStateEntanglingForDisentangle ||
mState == eStateEntanglingForClose);
State oldState = mState;
mState = eStateEntangled;
// If we have pending messages, these have to be sent.
if (!mMessagesForTheOtherPort.IsEmpty()) {
{
nsTArray<MessageData> messages;
SharedMessageBody::FromSharedToMessagesChild(
mActor->Manager(), mMessagesForTheOtherPort, messages);
mActor->SendPostMessages(messages);
}
// Because `messages` borrow the underlying JSStructuredCloneData buffers,
// only clear after `messages` have gone out of scope.
mMessagesForTheOtherPort.Clear();
}
// We must convert the messages into SharedMessageBodys to avoid leaks.
FallibleTArray<RefPtr<SharedMessageBody>> data;
if (NS_WARN_IF(
!SharedMessageBody::FromMessagesToSharedChild(aMessages, data))) {
DispatchError();
return;
}
// If the next step is to close the port, we do it ignoring the received
// messages.
if (oldState == eStateEntanglingForClose) {
CloseForced();
return;
}
mMessages.AppendElements(data);
// We were waiting for the entangling callback in order to disentangle this
// port immediately after.
if (oldState == eStateEntanglingForDisentangle) {
StartDisentangling();
return;
}
Dispatch();
}
void MessagePort::StartDisentangling() {
MOZ_ASSERT(mActor);
MOZ_ASSERT(mState == eStateEntangled);
mState = eStateDisentangling;
// Sending this message we communicate to the parent actor that we don't want
// to receive any new messages. It is possible that a message has been
// already sent but not received yet. So we have to collect all of them and
// we send them in the SendDispatch() request.
mActor->SendStopSendingData();
}
void MessagePort::MessagesReceived(nsTArray<MessageData>& aMessages) {
MOZ_ASSERT(mState == eStateEntangled || mState == eStateDisentangling ||
// This last step can happen only if Close() has been called
// manually. At this point SendClose() is sent but we can still
// receive something until the Closing request is processed.
mState == eStateDisentangledForClose);
MOZ_ASSERT(mMessagesForTheOtherPort.IsEmpty());
RemoveDocFromBFCache();
FallibleTArray<RefPtr<SharedMessageBody>> data;
if (NS_WARN_IF(
!SharedMessageBody::FromMessagesToSharedChild(aMessages, data))) {
DispatchError();
return;
}
mMessages.AppendElements(data);
if (mState == eStateEntangled) {
Dispatch();
}
}
void MessagePort::StopSendingDataConfirmed() {
MOZ_ASSERT(mState == eStateDisentangling);
MOZ_ASSERT(mActor);
Disentangle();
}
void MessagePort::Disentangle() {
MOZ_ASSERT(mState == eStateDisentangling);
MOZ_ASSERT(mActor);
mState = eStateDisentangled;
{
nsTArray<MessageData> messages;
SharedMessageBody::FromSharedToMessagesChild(mActor->Manager(), mMessages,
messages);
mActor->SendDisentangle(messages);
}
// Let's inform the RefMessageBodyService that any our shared messages are
// now invalid.
mRefMessageBodyService->ForgetPort(mIdentifier->uuid());
// Only clear mMessages after the MessageData instances have gone out of scope
// because they borrow mMessages' underlying JSStructuredCloneDatas.
mMessages.Clear();
mActor->SetPort(nullptr);
mActor = nullptr;
UpdateMustKeepAlive();
}
void MessagePort::CloneAndDisentangle(UniqueMessagePortId& aIdentifier) {
MOZ_ASSERT(mIdentifier);
MOZ_ASSERT(!mHasBeenTransferredOrClosed);
mHasBeenTransferredOrClosed = true;
// We can clone a port that has already been transfered. In this case, on the
// otherside will have a neutered port. Here we set neutered to true so that
// we are safe in case a early return.
aIdentifier.neutered() = true;
if (mState > eStateEntangled) {
return;
}
// We already have a 'next step'. We have to consider this port as already
// cloned/closed/disentangled.
if (mState == eStateEntanglingForDisentangle ||
mState == eStateEntanglingForClose) {
return;
}
aIdentifier.uuid() = mIdentifier->uuid();
aIdentifier.destinationUuid() = mIdentifier->destinationUuid();
aIdentifier.sequenceId() = mIdentifier->sequenceId() + 1;
aIdentifier.neutered() = false;
// We have to entangle first.
if (mState == eStateUnshippedEntangled) {
MOZ_ASSERT(mUnshippedEntangledPort);
MOZ_ASSERT(mMessagesForTheOtherPort.IsEmpty());
RefPtr<MessagePort> port = std::move(mUnshippedEntangledPort);
// Disconnect the entangled port and connect it to PBackground.
if (!port->ConnectToPBackground()) {
// We are probably shutting down. We cannot proceed.
mState = eStateDisentangled;
UpdateMustKeepAlive();
return;
}
// In this case, we don't need to be connected to the PBackground service.
if (mMessages.IsEmpty()) {
aIdentifier.sequenceId() = mIdentifier->sequenceId();
mState = eStateDisentangled;
UpdateMustKeepAlive();
return;
}
// Register this component to PBackground.
if (!ConnectToPBackground()) {
// We are probably shutting down. We cannot proceed.
return;
}
mState = eStateEntanglingForDisentangle;
return;
}
// Not entangled yet, we have to wait.
if (mState == eStateEntangling) {
mState = eStateEntanglingForDisentangle;
return;
}
MOZ_ASSERT(mState == eStateEntangled);
StartDisentangling();
}
void MessagePort::Closed() {
if (mState >= eStateDisentangled) {
return;
}
mState = eStateDisentangledForClose;
if (mActor) {
mActor->SetPort(nullptr);
mActor = nullptr;
}
UpdateMustKeepAlive();
}
bool MessagePort::ConnectToPBackground() {
RefPtr<MessagePort> self = this;
auto raii = MakeScopeExit([self] {
self->mState = eStateDisentangled;
self->UpdateMustKeepAlive();
});
mozilla::ipc::PBackgroundChild* actorChild =
mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread();
if (NS_WARN_IF(!actorChild)) {
return false;
}
PMessagePortChild* actor = actorChild->SendPMessagePortConstructor(
mIdentifier->uuid(), mIdentifier->destinationUuid(),
mIdentifier->sequenceId());
if (NS_WARN_IF(!actor)) {
return false;
}
mActor = static_cast<MessagePortChild*>(actor);
MOZ_ASSERT(mActor);
mActor->SetPort(this);
mState = eStateEntangling;
raii.release();
return true;
}
void MessagePort::UpdateMustKeepAlive() {
if (mState >= eStateDisentangled && mMessages.IsEmpty() && mIsKeptAlive) {
mIsKeptAlive = false;
// The DTOR of this WorkerRef will release the worker for us.
mWorkerRef = nullptr;
Release();
return;
}
if (mState < eStateDisentangled && !mIsKeptAlive) {
mIsKeptAlive = true;
AddRef();
}
}
void MessagePort::DisconnectFromOwner() {
CloseForced();
DOMEventTargetHelper::DisconnectFromOwner();
}
void MessagePort::RemoveDocFromBFCache() {
if (!NS_IsMainThread()) {
return;
}
nsPIDOMWindowInner* window = GetOwner();
if (!window) {
return;
}
Document* doc = window->GetExtantDoc();
if (!doc) {
return;
}
nsCOMPtr<nsIBFCacheEntry> bfCacheEntry = doc->GetBFCacheEntry();
if (!bfCacheEntry) {
return;
}
bfCacheEntry->RemoveFromBFCacheSync();
}
/* static */
void MessagePort::ForceClose(const MessagePortIdentifier& aIdentifier) {
mozilla::ipc::PBackgroundChild* actorChild =
mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread();
if (NS_WARN_IF(!actorChild)) {
MOZ_CRASH("Failed to create a PBackgroundChild actor!");
}
Unused << actorChild->SendMessagePortForceClose(aIdentifier.uuid(),
aIdentifier.destinationUuid(),
aIdentifier.sequenceId());
}
void MessagePort::DispatchError() {
nsCOMPtr<nsIGlobalObject> globalObject = GetParentObject();
AutoJSAPI jsapi;
if (!globalObject || !jsapi.Init(globalObject)) {
NS_WARNING("Failed to initialize AutoJSAPI object.");
return;
}
RootedDictionary<MessageEventInit> init(jsapi.cx());
init.mBubbles = false;
init.mCancelable = false;
RefPtr<Event> event =
MessageEvent::Constructor(this, NS_LITERAL_STRING("messageerror"), init);
event->SetTrusted(true);
DispatchEvent(*event);
}
} // namespace dom
} // namespace mozilla