dom/serviceworkers/ServiceWorkerCloneData.cpp

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 #include "ServiceWorkerCloneData.h"
   8
   9 #include <utility>
  10 #include "mozilla/RefPtr.h"
  11 #include "mozilla/dom/DOMTypes.h"
  12 #include "mozilla/dom/StructuredCloneHolder.h"
  13 #include "nsISerialEventTarget.h"
  14 #include "nsProxyRelease.h"
  15 #include "nsThreadUtils.h"
  16
  17 namespace mozilla::dom {
  18
  19 ServiceWorkerCloneData::~ServiceWorkerCloneData() {
  20   RefPtr<ipc::SharedJSAllocatedData> sharedData = TakeSharedData();
  21   if (sharedData) {
  22     NS_ProxyRelease(__func__, mEventTarget, sharedData.forget());
  23   }
  24 }
  25
  26 ServiceWorkerCloneData::ServiceWorkerCloneData()
  27     : ipc::StructuredCloneData(
  28           StructuredCloneHolder::StructuredCloneScope::UnknownDestination,
  29           StructuredCloneHolder::TransferringSupported),
  30       mEventTarget(GetCurrentSerialEventTarget()),
  31       mIsErrorMessageData(false) {
  32   MOZ_DIAGNOSTIC_ASSERT(mEventTarget);
  33 }
  34
  35 bool ServiceWorkerCloneData::BuildClonedMessageData(
  36     ClonedOrErrorMessageData& aClonedData) {
  37   if (IsErrorMessageData()) {
  38     aClonedData = ErrorMessageData();
  39     return true;
  40   }
  41
  42   MOZ_DIAGNOSTIC_ASSERT(
  43       CloneScope() ==
  44       StructuredCloneHolder::StructuredCloneScope::DifferentProcess);
  45
  46   ClonedMessageData messageData;
  47   if (!StructuredCloneData::BuildClonedMessageData(messageData)) {
  48     return false;
  49   }
  50
  51   aClonedData = std::move(messageData);
  52
  53   return true;
  54 }
  55
  56 void ServiceWorkerCloneData::CopyFromClonedMessageData(
  57     const ClonedOrErrorMessageData& aClonedData) {
  58   if (aClonedData.type() == ClonedOrErrorMessageData::TErrorMessageData) {
  59     mIsErrorMessageData = true;
  60     return;
  61   }
  62
  63   MOZ_DIAGNOSTIC_ASSERT(aClonedData.type() ==
  64                         ClonedOrErrorMessageData::TClonedMessageData);
  65
  66   StructuredCloneData::CopyFromClonedMessageData(aClonedData);
  67 }
  68
  69 void ServiceWorkerCloneData::SetAsErrorMessageData() {
  70   MOZ_ASSERT(CloneScope() ==
  71              StructuredCloneHolder::StructuredCloneScope::SameProcess);
  72
  73   mIsErrorMessageData = true;
  74 }
  75
  76 bool ServiceWorkerCloneData::IsErrorMessageData() const {
  77   return mIsErrorMessageData;
  78 }
  79
  80 }  // namespace mozilla::dom