Quelle  JSProcessActorChild.cpp

/* 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 "mozilla/dom/JSProcessActorChild.h"

#include "mozilla/dom/ContentChild.h"
#include "mozilla/dom/InProcessChild.h"
#include "mozilla/dom/InProcessParent.h"
#include "mozilla/dom/JSIPCValue.h"
#include "mozilla/dom/JSIPCValueUtils.h"
#include "mozilla/dom/JSProcessActorBinding.h"

namespace mozilla::dom {

NS_IMPL_CYCLE_COLLECTION_INHERITED(JSProcessActorChild, JSActor, mManager)

NS_INTERFACE_MAP_BEGIN_CYCLE_COLLECTION(JSProcessActorChild)
NS_INTERFACE_MAP_END_INHERITING(JSActor)

NS_IMPL_ADDREF_INHERITED(JSProcessActorChild, JSActor)
NS_IMPL_RELEASE_INHERITED(JSProcessActorChild, JSActor)

JSObject* JSProcessActorChild::WrapObject(JSContext* aCx,
                                          JS::Handle<JSObject*> aGivenProto) {
  return JSProcessActorChild_Binding::Wrap(aCx, this, aGivenProto);
}

void JSProcessActorChild::SendRawMessage(const JSActorMessageMeta& aMeta,
                                         JSIPCValue&& aData,
                                         ipc::StructuredCloneData* aStack,
                                         ErrorResult& aRv) {
  if (NS_WARN_IF(!CanSend() || !mManager || !mManager->GetCanSend())) {
    aRv.ThrowInvalidStateError("JSProcessActorChild cannot send at the moment");
    return;
  }

  // If the parent side is in the same process, we have a PInProcess manager,
  // and can dispatch the message directly to the event loop.
  ContentChild* contentChild = mManager->AsContentChild();
  if (!contentChild) {
    SendRawMessageInProcess(aMeta, std::move(aData), std::move(aStack), []() {
      return do_AddRef(InProcessParent::Singleton());
    });
    return;
  }

  // Cross-process case - send data over ContentChild to other side.
  if (NS_WARN_IF(!contentChild->SendRawMessage(aMeta, aData, aStack))) {
    aRv.ThrowOperationError(
        nsPrintfCString("JSProcessActorChild send error in actor '%s'",
                        PromiseFlatCString(aMeta.actorName()).get()));
    return;
  }
}

void JSProcessActorChild::Init(const nsACString& aName,
                               nsIDOMProcessChild* aManager) {
  MOZ_ASSERT(!mManager, "Cannot Init() a JSProcessActorChild twice!");
  mManager = aManager;
  bool sendTyped =
      !!mManager->AsContentChild() && JSActorSupportsTypedSend(aName);
  JSActor::Init(aName, sendTyped);
}

void JSProcessActorChild::ClearManager() { mManager = nullptr; }

}  // namespace mozilla::dom