gecko-dev/ipc/glue/IPCStreamChild.cpp

/* -*- 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 "IPCStreamDestination.h"
#include "IPCStreamSource.h"

#include "mozilla/Unused.h"
#include "mozilla/dom/nsIContentChild.h"
#include "mozilla/ipc/PBackgroundChild.h"
#include "mozilla/ipc/PChildToParentStreamChild.h"
#include "mozilla/ipc/PParentToChildStreamChild.h"

namespace mozilla {
namespace ipc {

// Child to Parent implementation
// ----------------------------------------------------------------------------

namespace {

class IPCStreamSourceChild final : public PChildToParentStreamChild,
                                   public IPCStreamSource {
 public:
  static IPCStreamSourceChild* Create(nsIAsyncInputStream* aInputStream) {
    MOZ_ASSERT(aInputStream);

    IPCStreamSourceChild* source = new IPCStreamSourceChild(aInputStream);
    if (!source->Initialize()) {
      delete source;
      return nullptr;
    }

    return source;
  }

  // PChildToParentStreamChild methods

  void ActorDestroy(ActorDestroyReason aReason) override { ActorDestroyed(); }

  IPCResult RecvStartReading() override {
    Start();
    return IPC_OK();
  }

  IPCResult RecvRequestClose(const nsresult& aRv) override {
    OnEnd(aRv);
    return IPC_OK();
  }

  void Close(nsresult aRv) override {
    MOZ_ASSERT(IPCStreamSource::mState == IPCStreamSource::eClosed);
    Unused << SendClose(aRv);
  }

  void SendData(const wr::ByteBuffer& aBuffer) override {
    Unused << SendBuffer(aBuffer);
  }

 private:
  explicit IPCStreamSourceChild(nsIAsyncInputStream* aInputStream)
      : IPCStreamSource(aInputStream) {}
};

}  // anonymous namespace

/* static */ PChildToParentStreamChild* IPCStreamSource::Create(
    nsIAsyncInputStream* aInputStream, dom::nsIContentChild* aManager) {
  MOZ_ASSERT(aInputStream);
  MOZ_ASSERT(aManager);

  // PContent can only be used on the main thread
  MOZ_ASSERT(NS_IsMainThread());

  IPCStreamSourceChild* source = IPCStreamSourceChild::Create(aInputStream);
  if (!source) {
    return nullptr;
  }

  if (!aManager->SendPChildToParentStreamConstructor(source)) {
    return nullptr;
  }

  source->ActorConstructed();
  return source;
}

/* static */ PChildToParentStreamChild* IPCStreamSource::Create(
    nsIAsyncInputStream* aInputStream, PBackgroundChild* aManager) {
  MOZ_ASSERT(aInputStream);
  MOZ_ASSERT(aManager);

  IPCStreamSourceChild* source = IPCStreamSourceChild::Create(aInputStream);
  if (!source) {
    return nullptr;
  }

  if (!aManager->SendPChildToParentStreamConstructor(source)) {
    return nullptr;
  }

  source->ActorConstructed();
  return source;
}

/* static */ IPCStreamSource* IPCStreamSource::Cast(
    PChildToParentStreamChild* aActor) {
  MOZ_ASSERT(aActor);
  return static_cast<IPCStreamSourceChild*>(aActor);
}

// Parent to Child implementation
// ----------------------------------------------------------------------------

namespace {

class IPCStreamDestinationChild final : public PParentToChildStreamChild,
                                        public IPCStreamDestination {
 public:
  nsresult Initialize() { return IPCStreamDestination::Initialize(); }

  ~IPCStreamDestinationChild() {}

 private:
  // PParentToChildStreamChild methods

  void ActorDestroy(ActorDestroyReason aReason) override { ActorDestroyed(); }

  IPCResult RecvBuffer(const wr::ByteBuffer& aBuffer) override {
    BufferReceived(aBuffer);
    return IPC_OK();
  }

  IPCResult RecvClose(const nsresult& aRv) override {
    CloseReceived(aRv);
    return IPC_OK();
  }

  // IPCStreamDestination methods

  void StartReading() override {
    MOZ_ASSERT(HasDelayedStart());
    Unused << SendStartReading();
  }

  void RequestClose(nsresult aRv) override { Unused << SendRequestClose(aRv); }

  void TerminateDestination() override { Unused << Send__delete__(this); }
};

}  // anonymous namespace

PParentToChildStreamChild* AllocPParentToChildStreamChild() {
  IPCStreamDestinationChild* actor = new IPCStreamDestinationChild();

  if (NS_WARN_IF(NS_FAILED(actor->Initialize()))) {
    delete actor;
    actor = nullptr;
  }

  return actor;
}

void DeallocPParentToChildStreamChild(PParentToChildStreamChild* aActor) {
  delete aActor;
}

/* static */ IPCStreamDestination* IPCStreamDestination::Cast(
    PParentToChildStreamChild* aActor) {
  MOZ_ASSERT(aActor);
  return static_cast<IPCStreamDestinationChild*>(aActor);
}

}  // namespace ipc
}  // namespace mozilla