mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-09-11 02:56:06 +00:00
995 lines
25 KiB
C++
995 lines
25 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "MessagePort.h"
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#include "MessageEvent.h"
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#include "MessagePortChild.h"
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#include "mozilla/dom/BlobBinding.h"
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#include "mozilla/dom/Event.h"
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#include "mozilla/dom/File.h"
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#include "mozilla/dom/MessageChannel.h"
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#include "mozilla/dom/MessagePortBinding.h"
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#include "mozilla/dom/MessagePortChild.h"
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#include "mozilla/dom/MessagePortList.h"
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#include "mozilla/dom/PMessagePort.h"
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#include "mozilla/dom/StructuredCloneTags.h"
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#include "mozilla/dom/WorkerPrivate.h"
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#include "mozilla/dom/WorkerScope.h"
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#include "mozilla/ipc/BackgroundChild.h"
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#include "mozilla/ipc/PBackgroundChild.h"
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#include "mozilla/unused.h"
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#include "nsContentUtils.h"
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#include "nsGlobalWindow.h"
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#include "nsPresContext.h"
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#include "ScriptSettings.h"
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#include "SharedMessagePortMessage.h"
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#include "nsIBFCacheEntry.h"
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#include "nsIDocument.h"
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#include "nsIDOMFileList.h"
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#include "nsIPresShell.h"
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#include "nsISupportsPrimitives.h"
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#include "nsServiceManagerUtils.h"
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#ifdef XP_WIN
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#undef PostMessage
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#endif
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using namespace mozilla::dom::workers;
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namespace mozilla {
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namespace dom {
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class DispatchEventRunnable final : public nsICancelableRunnable
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{
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friend class MessagePort;
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public:
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NS_DECL_ISUPPORTS
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explicit DispatchEventRunnable(MessagePort* aPort)
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: mPort(aPort)
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{ }
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NS_IMETHOD
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Run() override
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{
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MOZ_ASSERT(mPort);
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MOZ_ASSERT(mPort->mDispatchRunnable == this);
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mPort->mDispatchRunnable = nullptr;
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mPort->Dispatch();
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return NS_OK;
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}
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NS_IMETHOD
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Cancel() override
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{
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mPort = nullptr;
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return NS_OK;
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}
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private:
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~DispatchEventRunnable()
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{}
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RefPtr<MessagePort> mPort;
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};
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NS_IMPL_ISUPPORTS(DispatchEventRunnable, nsICancelableRunnable, nsIRunnable)
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class PostMessageRunnable final : public nsICancelableRunnable
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{
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public:
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NS_DECL_ISUPPORTS
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PostMessageRunnable(MessagePort* aPort, SharedMessagePortMessage* aData)
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: mPort(aPort)
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, mData(aData)
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{
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MOZ_ASSERT(aPort);
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MOZ_ASSERT(aData);
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}
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NS_IMETHOD
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Run() override
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{
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nsCOMPtr<nsIGlobalObject> globalObject;
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if (NS_IsMainThread()) {
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globalObject = do_QueryInterface(mPort->GetParentObject());
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} else {
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WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
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MOZ_ASSERT(workerPrivate);
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globalObject = workerPrivate->GlobalScope();
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}
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AutoJSAPI jsapi;
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if (!globalObject || !jsapi.Init(globalObject)) {
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NS_WARNING("Failed to initialize AutoJSAPI object.");
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return NS_ERROR_FAILURE;
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}
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JSContext* cx = jsapi.cx();
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nsCOMPtr<nsPIDOMWindow> window =
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do_QueryInterface(mPort->GetParentObject());
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ErrorResult rv;
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JS::Rooted<JS::Value> value(cx);
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mData->Read(window, cx, &value, rv);
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if (NS_WARN_IF(rv.Failed())) {
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return rv.StealNSResult();
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}
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// Create the event
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nsCOMPtr<mozilla::dom::EventTarget> eventTarget =
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do_QueryInterface(mPort->GetOwner());
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RefPtr<MessageEvent> event =
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new MessageEvent(eventTarget, nullptr, nullptr);
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event->InitMessageEvent(NS_LITERAL_STRING("message"),
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false /* non-bubbling */,
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false /* cancelable */, value, EmptyString(),
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EmptyString(), nullptr);
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event->SetTrusted(true);
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event->SetSource(mPort);
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nsTArray<RefPtr<MessagePort>> ports = mData->TakeTransferredPorts();
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RefPtr<MessagePortList> portList =
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new MessagePortList(static_cast<dom::Event*>(event.get()),
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ports);
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event->SetPorts(portList);
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bool dummy;
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mPort->DispatchEvent(static_cast<dom::Event*>(event.get()), &dummy);
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// We must check if we were waiting for this message in order to shutdown
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// the port.
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mPort->UpdateMustKeepAlive();
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return NS_OK;
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}
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NS_IMETHOD
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Cancel() override
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{
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mPort = nullptr;
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mData = nullptr;
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return NS_OK;
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}
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private:
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~PostMessageRunnable()
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{}
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RefPtr<MessagePort> mPort;
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RefPtr<SharedMessagePortMessage> mData;
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};
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NS_IMPL_ISUPPORTS(PostMessageRunnable, nsICancelableRunnable, nsIRunnable)
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NS_IMPL_CYCLE_COLLECTION_CLASS(MessagePort)
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NS_IMPL_CYCLE_COLLECTION_UNLINK_BEGIN_INHERITED(MessagePort,
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DOMEventTargetHelper)
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if (tmp->mDispatchRunnable) {
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mDispatchRunnable->mPort);
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}
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessages);
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mMessagesForTheOtherPort);
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NS_IMPL_CYCLE_COLLECTION_UNLINK(mUnshippedEntangledPort);
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NS_IMPL_CYCLE_COLLECTION_UNLINK_END
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_BEGIN_INHERITED(MessagePort,
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DOMEventTargetHelper)
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if (tmp->mDispatchRunnable) {
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mDispatchRunnable->mPort);
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}
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE(mUnshippedEntangledPort);
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NS_IMPL_CYCLE_COLLECTION_TRAVERSE_END
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NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION_INHERITED(MessagePort)
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NS_INTERFACE_MAP_ENTRY(nsIIPCBackgroundChildCreateCallback)
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NS_INTERFACE_MAP_ENTRY(nsIObserver)
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NS_INTERFACE_MAP_END_INHERITING(DOMEventTargetHelper)
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NS_IMPL_ADDREF_INHERITED(MessagePort, DOMEventTargetHelper)
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NS_IMPL_RELEASE_INHERITED(MessagePort, DOMEventTargetHelper)
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namespace {
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class MessagePortFeature final : public workers::WorkerFeature
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{
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MessagePort* mPort;
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public:
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explicit MessagePortFeature(MessagePort* aPort)
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: mPort(aPort)
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{
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MOZ_ASSERT(aPort);
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MOZ_COUNT_CTOR(MessagePortFeature);
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}
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virtual bool Notify(JSContext* aCx, workers::Status aStatus) override
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{
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if (aStatus > Running) {
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// We cannot process messages anymore because we cannot dispatch new
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// runnables. Let's force a Close().
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mPort->CloseForced();
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}
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return true;
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}
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private:
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~MessagePortFeature()
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{
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MOZ_COUNT_DTOR(MessagePortFeature);
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}
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};
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class ForceCloseHelper final : public nsIIPCBackgroundChildCreateCallback
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{
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public:
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NS_DECL_ISUPPORTS
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static void ForceClose(const MessagePortIdentifier& aIdentifier)
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{
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PBackgroundChild* actor =
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mozilla::ipc::BackgroundChild::GetForCurrentThread();
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if (actor) {
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Unused << actor->SendMessagePortForceClose(aIdentifier.uuid(),
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aIdentifier.destinationUuid(),
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aIdentifier.sequenceId());
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return;
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}
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RefPtr<ForceCloseHelper> helper = new ForceCloseHelper(aIdentifier);
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if (NS_WARN_IF(!mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread(helper))) {
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MOZ_CRASH();
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}
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}
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private:
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explicit ForceCloseHelper(const MessagePortIdentifier& aIdentifier)
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: mIdentifier(aIdentifier)
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{}
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~ForceCloseHelper() {}
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void ActorFailed() override
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{
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MOZ_CRASH("Failed to create a PBackgroundChild actor!");
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}
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void ActorCreated(mozilla::ipc::PBackgroundChild* aActor) override
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{
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ForceClose(mIdentifier);
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}
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const MessagePortIdentifier mIdentifier;
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};
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NS_IMPL_ISUPPORTS(ForceCloseHelper, nsIIPCBackgroundChildCreateCallback)
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} // namespace
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MessagePort::MessagePort(nsPIDOMWindow* aWindow)
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: DOMEventTargetHelper(aWindow)
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, mInnerID(0)
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, mMessageQueueEnabled(false)
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, mIsKeptAlive(false)
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{
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mIdentifier = new MessagePortIdentifier();
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mIdentifier->neutered() = true;
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mIdentifier->sequenceId() = 0;
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}
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MessagePort::~MessagePort()
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{
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CloseForced();
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MOZ_ASSERT(!mWorkerFeature);
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}
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/* static */ already_AddRefed<MessagePort>
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MessagePort::Create(nsPIDOMWindow* aWindow, const nsID& aUUID,
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const nsID& aDestinationUUID, ErrorResult& aRv)
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{
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RefPtr<MessagePort> mp = new MessagePort(aWindow);
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mp->Initialize(aUUID, aDestinationUUID, 1 /* 0 is an invalid sequence ID */,
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false /* Neutered */, eStateUnshippedEntangled, aRv);
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return mp.forget();
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}
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/* static */ already_AddRefed<MessagePort>
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MessagePort::Create(nsPIDOMWindow* aWindow,
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const MessagePortIdentifier& aIdentifier,
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ErrorResult& aRv)
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{
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RefPtr<MessagePort> mp = new MessagePort(aWindow);
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mp->Initialize(aIdentifier.uuid(), aIdentifier.destinationUuid(),
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aIdentifier.sequenceId(), aIdentifier.neutered(),
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eStateEntangling, aRv);
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return mp.forget();
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}
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void
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MessagePort::UnshippedEntangle(MessagePort* aEntangledPort)
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{
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MOZ_ASSERT(aEntangledPort);
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MOZ_ASSERT(!mUnshippedEntangledPort);
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mUnshippedEntangledPort = aEntangledPort;
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}
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void
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MessagePort::Initialize(const nsID& aUUID,
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const nsID& aDestinationUUID,
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uint32_t aSequenceID, bool mNeutered,
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State aState, ErrorResult& aRv)
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{
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MOZ_ASSERT(mIdentifier);
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mIdentifier->uuid() = aUUID;
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mIdentifier->destinationUuid() = aDestinationUUID;
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mIdentifier->sequenceId() = aSequenceID;
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mState = aState;
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if (mNeutered) {
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// If this port is neutered we don't want to keep it alive artificially nor
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// we want to add listeners or workerFeatures.
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mState = eStateDisentangled;
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return;
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}
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if (mState == eStateEntangling) {
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ConnectToPBackground();
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} else {
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MOZ_ASSERT(mState == eStateUnshippedEntangled);
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}
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// The port has to keep itself alive until it's entangled.
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UpdateMustKeepAlive();
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if (!NS_IsMainThread()) {
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WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
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MOZ_ASSERT(workerPrivate);
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MOZ_ASSERT(!mWorkerFeature);
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nsAutoPtr<WorkerFeature> feature(new MessagePortFeature(this));
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JSContext* cx = workerPrivate->GetJSContext();
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if (NS_WARN_IF(!workerPrivate->AddFeature(cx, feature))) {
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aRv.Throw(NS_ERROR_FAILURE);
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return;
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}
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mWorkerFeature = Move(feature);
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} else if (GetOwner()) {
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MOZ_ASSERT(NS_IsMainThread());
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MOZ_ASSERT(GetOwner()->IsInnerWindow());
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mInnerID = GetOwner()->WindowID();
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nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
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if (obs) {
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obs->AddObserver(this, "inner-window-destroyed", false);
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}
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}
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}
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JSObject*
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MessagePort::WrapObject(JSContext* aCx, JS::Handle<JSObject*> aGivenProto)
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{
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return MessagePortBinding::Wrap(aCx, this, aGivenProto);
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}
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void
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MessagePort::PostMessage(JSContext* aCx, JS::Handle<JS::Value> aMessage,
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const Optional<Sequence<JS::Value>>& aTransferable,
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ErrorResult& aRv)
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{
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// We *must* clone the data here, or the JS::Value could be modified
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// by script
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JS::Rooted<JS::Value> transferable(aCx, JS::UndefinedValue());
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if (aTransferable.WasPassed()) {
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const Sequence<JS::Value>& realTransferable = aTransferable.Value();
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// Here we want to check if the transerable object list contains
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// this port. No other checks are done.
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for (const JS::Value& value : realTransferable) {
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if (!value.isObject()) {
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continue;
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}
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MessagePort* port = nullptr;
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nsresult rv = UNWRAP_OBJECT(MessagePort, &value.toObject(), port);
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if (NS_FAILED(rv)) {
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continue;
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}
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if (port == this) {
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aRv.Throw(NS_ERROR_DOM_DATA_CLONE_ERR);
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return;
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}
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}
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// The input sequence only comes from the generated bindings code, which
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// ensures it is rooted.
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JS::HandleValueArray elements =
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JS::HandleValueArray::fromMarkedLocation(realTransferable.Length(),
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realTransferable.Elements());
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JSObject* array =
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JS_NewArrayObject(aCx, elements);
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if (!array) {
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aRv.Throw(NS_ERROR_OUT_OF_MEMORY);
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return;
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}
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transferable.setObject(*array);
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}
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RefPtr<SharedMessagePortMessage> data = new SharedMessagePortMessage();
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data->Write(aCx, aMessage, transferable, aRv);
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if (NS_WARN_IF(aRv.Failed())) {
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return;
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}
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// This message has to be ignored.
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if (mState > eStateEntangled) {
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return;
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}
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// If we are unshipped we are connected to the other port on the same thread.
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if (mState == eStateUnshippedEntangled) {
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MOZ_ASSERT(mUnshippedEntangledPort);
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mUnshippedEntangledPort->mMessages.AppendElement(data);
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mUnshippedEntangledPort->Dispatch();
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return;
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}
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// Not entangled yet, but already closed/disentangled.
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if (mState == eStateEntanglingForDisentangle ||
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mState == eStateEntanglingForClose) {
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return;
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}
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RemoveDocFromBFCache();
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// Not entangled yet.
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if (mState == eStateEntangling) {
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mMessagesForTheOtherPort.AppendElement(data);
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return;
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}
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MOZ_ASSERT(mActor);
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MOZ_ASSERT(mMessagesForTheOtherPort.IsEmpty());
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nsAutoTArray<RefPtr<SharedMessagePortMessage>, 1> array;
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array.AppendElement(data);
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nsAutoTArray<MessagePortMessage, 1> messages;
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SharedMessagePortMessage::FromSharedToMessagesChild(mActor, array, messages);
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mActor->SendPostMessages(messages);
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}
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void
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MessagePort::Start()
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{
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if (mMessageQueueEnabled) {
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return;
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}
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mMessageQueueEnabled = true;
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Dispatch();
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}
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void
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MessagePort::Dispatch()
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{
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if (!mMessageQueueEnabled || mMessages.IsEmpty() || mDispatchRunnable) {
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return;
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}
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switch (mState) {
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case eStateUnshippedEntangled:
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// Everything is fine here. We have messages because the other
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// port populates our queue directly.
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break;
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case eStateEntangling:
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// Everything is fine here as well. We have messages because the other
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// port populated our queue directly when we were in the
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// eStateUnshippedEntangled state.
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break;
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case eStateEntanglingForDisentangle:
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// Here we don't want to ship messages because these messages must be
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// delivered by the cloned version of this one. They will be sent in the
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// SendDisentangle().
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return;
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case eStateEntanglingForClose:
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// We still want to deliver messages if we are closing. These messages
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// are here from the previous eStateUnshippedEntangled state.
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break;
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case eStateEntangled:
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// This port is up and running.
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break;
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case eStateDisentangling:
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// If we are in the process to disentangle the port, we cannot dispatch
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// messages. They will be sent to the cloned version of this port via
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// SendDisentangle();
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return;
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case eStateDisentangled:
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MOZ_CRASH("This cannot happen.");
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// It cannot happen because Disentangle should take off all the pending
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// messages.
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break;
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case eStateDisentangledForClose:
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// If we are here is because the port has been closed. We can still
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// process the pending messages.
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break;
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}
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RefPtr<SharedMessagePortMessage> data = mMessages.ElementAt(0);
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mMessages.RemoveElementAt(0);
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RefPtr<PostMessageRunnable> runnable = new PostMessageRunnable(this, data);
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MOZ_ALWAYS_TRUE(NS_SUCCEEDED(NS_DispatchToCurrentThread(runnable)));
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mDispatchRunnable = new DispatchEventRunnable(this);
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|
|
MOZ_ALWAYS_TRUE(NS_SUCCEEDED(NS_DispatchToCurrentThread(mDispatchRunnable)));
|
|
}
|
|
|
|
void
|
|
MessagePort::Close()
|
|
{
|
|
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();
|
|
}
|
|
|
|
if (mState == eStateUnshippedEntangled) {
|
|
MOZ_ASSERT(mUnshippedEntangledPort);
|
|
|
|
// This avoids loops.
|
|
RefPtr<MessagePort> port = Move(mUnshippedEntangledPort);
|
|
MOZ_ASSERT(mUnshippedEntangledPort == nullptr);
|
|
|
|
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()
|
|
{
|
|
if (NS_IsMainThread()) {
|
|
return GetEventHandler(nsGkAtoms::onmessage, EmptyString());
|
|
}
|
|
return GetEventHandler(nullptr, NS_LITERAL_STRING("message"));
|
|
}
|
|
|
|
void
|
|
MessagePort::SetOnmessage(EventHandlerNonNull* aCallback)
|
|
{
|
|
if (NS_IsMainThread()) {
|
|
SetEventHandler(nsGkAtoms::onmessage, EmptyString(), aCallback);
|
|
} else {
|
|
SetEventHandler(nullptr, NS_LITERAL_STRING("message"), 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<MessagePortMessage>& 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<MessagePortMessage> messages;
|
|
SharedMessagePortMessage::FromSharedToMessagesChild(mActor,
|
|
mMessagesForTheOtherPort,
|
|
messages);
|
|
mMessagesForTheOtherPort.Clear();
|
|
mActor->SendPostMessages(messages);
|
|
}
|
|
|
|
// We must convert the messages into SharedMessagePortMessages to avoid leaks.
|
|
FallibleTArray<RefPtr<SharedMessagePortMessage>> data;
|
|
if (NS_WARN_IF(!SharedMessagePortMessage::FromMessagesToSharedChild(aMessages,
|
|
data))) {
|
|
// OOM, we cannot continue.
|
|
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<MessagePortMessage>& 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<SharedMessagePortMessage>> data;
|
|
if (NS_WARN_IF(!SharedMessagePortMessage::FromMessagesToSharedChild(aMessages,
|
|
data))) {
|
|
// OOM, We cannot continue.
|
|
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<MessagePortMessage> messages;
|
|
SharedMessagePortMessage::FromSharedToMessagesChild(mActor, mMessages,
|
|
messages);
|
|
mMessages.Clear();
|
|
mActor->SendDisentangle(messages);
|
|
|
|
mActor->SetPort(nullptr);
|
|
mActor = nullptr;
|
|
|
|
UpdateMustKeepAlive();
|
|
}
|
|
|
|
void
|
|
MessagePort::CloneAndDisentangle(MessagePortIdentifier& aIdentifier)
|
|
{
|
|
MOZ_ASSERT(mIdentifier);
|
|
|
|
// 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());
|
|
|
|
// Disconnect the entangled port and connect it to PBackground.
|
|
mUnshippedEntangledPort->ConnectToPBackground();
|
|
mUnshippedEntangledPort = nullptr;
|
|
|
|
// 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.
|
|
ConnectToPBackground();
|
|
|
|
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();
|
|
}
|
|
|
|
void
|
|
MessagePort::ConnectToPBackground()
|
|
{
|
|
mState = eStateEntangling;
|
|
|
|
PBackgroundChild* actor =
|
|
mozilla::ipc::BackgroundChild::GetForCurrentThread();
|
|
if (actor) {
|
|
ActorCreated(actor);
|
|
} else {
|
|
if (NS_WARN_IF(
|
|
!mozilla::ipc::BackgroundChild::GetOrCreateForCurrentThread(this))) {
|
|
MOZ_CRASH();
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
MessagePort::ActorFailed()
|
|
{
|
|
MOZ_CRASH("Failed to create a PBackgroundChild actor!");
|
|
}
|
|
|
|
void
|
|
MessagePort::ActorCreated(mozilla::ipc::PBackgroundChild* aActor)
|
|
{
|
|
MOZ_ASSERT(aActor);
|
|
MOZ_ASSERT(!mActor);
|
|
MOZ_ASSERT(mIdentifier);
|
|
MOZ_ASSERT(mState == eStateEntangling ||
|
|
mState == eStateEntanglingForDisentangle ||
|
|
mState == eStateEntanglingForClose);
|
|
|
|
PMessagePortChild* actor =
|
|
aActor->SendPMessagePortConstructor(mIdentifier->uuid(),
|
|
mIdentifier->destinationUuid(),
|
|
mIdentifier->sequenceId());
|
|
|
|
mActor = static_cast<MessagePortChild*>(actor);
|
|
MOZ_ASSERT(mActor);
|
|
|
|
mActor->SetPort(this);
|
|
}
|
|
|
|
void
|
|
MessagePort::UpdateMustKeepAlive()
|
|
{
|
|
if (mState >= eStateDisentangled &&
|
|
mMessages.IsEmpty() &&
|
|
mIsKeptAlive) {
|
|
mIsKeptAlive = false;
|
|
|
|
if (mWorkerFeature) {
|
|
WorkerPrivate* workerPrivate = GetCurrentThreadWorkerPrivate();
|
|
MOZ_ASSERT(workerPrivate);
|
|
|
|
workerPrivate->RemoveFeature(workerPrivate->GetJSContext(),
|
|
mWorkerFeature);
|
|
mWorkerFeature = nullptr;
|
|
}
|
|
|
|
if (NS_IsMainThread()) {
|
|
nsCOMPtr<nsIObserverService> obs =
|
|
do_GetService("@mozilla.org/observer-service;1");
|
|
if (obs) {
|
|
obs->RemoveObserver(this, "inner-window-destroyed");
|
|
}
|
|
}
|
|
|
|
Release();
|
|
return;
|
|
}
|
|
|
|
if (mState < eStateDisentangled && !mIsKeptAlive) {
|
|
mIsKeptAlive = true;
|
|
AddRef();
|
|
}
|
|
}
|
|
|
|
NS_IMETHODIMP
|
|
MessagePort::Observe(nsISupports* aSubject, const char* aTopic,
|
|
const char16_t* aData)
|
|
{
|
|
MOZ_ASSERT(NS_IsMainThread());
|
|
|
|
if (strcmp(aTopic, "inner-window-destroyed")) {
|
|
return NS_OK;
|
|
}
|
|
|
|
// If the window id destroyed we have to release the reference that we are
|
|
// keeping.
|
|
if (!mIsKeptAlive) {
|
|
return NS_OK;
|
|
}
|
|
|
|
nsCOMPtr<nsISupportsPRUint64> wrapper = do_QueryInterface(aSubject);
|
|
NS_ENSURE_TRUE(wrapper, NS_ERROR_FAILURE);
|
|
|
|
uint64_t innerID;
|
|
nsresult rv = wrapper->GetData(&innerID);
|
|
NS_ENSURE_SUCCESS(rv, rv);
|
|
|
|
if (innerID == mInnerID) {
|
|
CloseForced();
|
|
}
|
|
|
|
return NS_OK;
|
|
}
|
|
|
|
void
|
|
MessagePort::RemoveDocFromBFCache()
|
|
{
|
|
if (!NS_IsMainThread()) {
|
|
return;
|
|
}
|
|
|
|
nsPIDOMWindow* window = GetOwner();
|
|
if (!window) {
|
|
return;
|
|
}
|
|
|
|
nsIDocument* doc = window->GetExtantDoc();
|
|
if (!doc) {
|
|
return;
|
|
}
|
|
|
|
nsCOMPtr<nsIBFCacheEntry> bfCacheEntry = doc->GetBFCacheEntry();
|
|
if (!bfCacheEntry) {
|
|
return;
|
|
}
|
|
|
|
bfCacheEntry->RemoveFromBFCacheSync();
|
|
}
|
|
|
|
/* static */ void
|
|
MessagePort::ForceClose(const MessagePortIdentifier& aIdentifier)
|
|
{
|
|
ForceCloseHelper::ForceClose(aIdentifier);
|
|
}
|
|
|
|
} // namespace dom
|
|
} // namespace mozilla
|