dom/messagechannel/MessagePortParent.cpp
author Cosmin Sabou <csabou@mozilla.com>
Sat, 02 Mar 2019 20:40:01 +0200
changeset 462132 bf3cbcc825276823afba2778333cf62cfa75039c
parent 461887 f41cee9bf14931b453838d1bbcbda528e3b064e8
permissions -rw-r--r--
Backed out 16 changesets (bug 827976) for causing bug 1532054. a=backout Backed out changeset 54c0b12443ed (bug 827976) Backed out changeset 92b45080d080 (bug 827976) Backed out changeset 443087a359f9 (bug 827976) Backed out changeset f976c2d4cebb (bug 827976) Backed out changeset 66cffb171024 (bug 827976) Backed out changeset 845e1d0b2402 (bug 827976) Backed out changeset fd94066a1d76 (bug 827976) Backed out changeset e253b264e7bd (bug 827976) Backed out changeset 07ef335770a8 (bug 827976) Backed out changeset 9d3805d77b99 (bug 827976) Backed out changeset eed600ceb606 (bug 827976) Backed out changeset 3b64368cff52 (bug 827976) Backed out changeset 69d0378e0c09 (bug 827976) Backed out changeset 9203871a5c6f (bug 827976) Backed out changeset 96a507c818e2 (bug 827976) Backed out changeset e254496ff95b (bug 827976)

/* -*- 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 "MessagePortParent.h"
#include "MessagePortService.h"
#include "SharedMessagePortMessage.h"
#include "mozilla/Unused.h"

namespace mozilla {
namespace dom {

MessagePortParent::MessagePortParent(const nsID& aUUID)
    : mService(MessagePortService::GetOrCreate()),
      mUUID(aUUID),
      mEntangled(false),
      mCanSendData(true) {
  MOZ_ASSERT(mService);
}

MessagePortParent::~MessagePortParent() {
  MOZ_ASSERT(!mService);
  MOZ_ASSERT(!mEntangled);
}

bool MessagePortParent::Entangle(const nsID& aDestinationUUID,
                                 const uint32_t& aSequenceID) {
  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return false;
  }

  MOZ_ASSERT(!mEntangled);

  return mService->RequestEntangling(this, aDestinationUUID, aSequenceID);
}

mozilla::ipc::IPCResult MessagePortParent::RecvPostMessages(
    nsTArray<ClonedMessageData>&& aMessages) {
  // This converts the object in a data struct where we have BlobImpls.
  FallibleTArray<RefPtr<SharedMessagePortMessage>> messages;
  if (NS_WARN_IF(!SharedMessagePortMessage::FromMessagesToSharedParent(
          aMessages, messages))) {
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mEntangled) {
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return IPC_FAIL_NO_REASON(this);
  }

  if (messages.IsEmpty()) {
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mService->PostMessages(this, messages)) {
    return IPC_FAIL_NO_REASON(this);
  }
  return IPC_OK();
}

mozilla::ipc::IPCResult MessagePortParent::RecvDisentangle(
    nsTArray<ClonedMessageData>&& aMessages) {
  // This converts the object in a data struct where we have BlobImpls.
  FallibleTArray<RefPtr<SharedMessagePortMessage>> messages;
  if (NS_WARN_IF(!SharedMessagePortMessage::FromMessagesToSharedParent(
          aMessages, messages))) {
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mEntangled) {
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mService) {
    NS_WARNING("Entangle is called after a shutdown!");
    return IPC_FAIL_NO_REASON(this);
  }

  if (!mService->DisentanglePort(this, messages)) {
    return IPC_FAIL_NO_REASON(this);
  }

  CloseAndDelete();
  return IPC_OK();
}

mozilla::ipc::IPCResult MessagePortParent::RecvStopSendingData() {
  if (!mEntangled) {
    return IPC_OK();
  }

  mCanSendData = false;
  Unused << SendStopSendingDataConfirmed();
  return IPC_OK();
}

mozilla::ipc::IPCResult MessagePortParent::RecvClose() {
  if (mService) {
    MOZ_ASSERT(mEntangled);

    if (!mService->ClosePort(this)) {
      return IPC_FAIL_NO_REASON(this);
    }

    Close();
  }

  MOZ_ASSERT(!mEntangled);

  Unused << Send__delete__(this);
  return IPC_OK();
}

void MessagePortParent::ActorDestroy(ActorDestroyReason aWhy) {
  if (mService && mEntangled) {
    // When the last parent is deleted, this service is freed but this cannot
    // be done when the hashtables are written by CloseAll.
    RefPtr<MessagePortService> kungFuDeathGrip = mService;
    kungFuDeathGrip->ParentDestroy(this);
  }
}

bool MessagePortParent::Entangled(
    const nsTArray<ClonedMessageData>& aMessages) {
  MOZ_ASSERT(!mEntangled);
  mEntangled = true;
  return SendEntangled(aMessages);
}

void MessagePortParent::CloseAndDelete() {
  Close();
  Unused << Send__delete__(this);
}

void MessagePortParent::Close() {
  mService = nullptr;
  mEntangled = false;
}

/* static */
bool MessagePortParent::ForceClose(const nsID& aUUID,
                                   const nsID& aDestinationUUID,
                                   const uint32_t& aSequenceID) {
  MessagePortService* service = MessagePortService::Get();
  if (!service) {
    NS_WARNING(
        "The service must exist if we want to close an existing MessagePort.");
    return false;
  }

  return service->ForceClose(aUUID, aDestinationUUID, aSequenceID);
}

}  // namespace dom
}  // namespace mozilla