gecko-dev/ipc/glue/IPCStreamParent.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 "mozilla/ipc/IPCStreamSource.h"
#include "mozilla/ipc/InputStreamUtils.h"
#include "mozilla/ipc/PChildToParentStreamParent.h"
#include "mozilla/ipc/PParentToChildStreamParent.h"
#include "mozilla/Unused.h"

namespace mozilla {
namespace ipc {

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

namespace {

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

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

    return source;
  }

  // PParentToChildStreamParent 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 IPCStreamSourceParent(nsIAsyncInputStream* aInputStream)
      : IPCStreamSource(aInputStream) {}
};

}  // anonymous namespace

/* static */
PParentToChildStreamParent* IPCStreamSource::Create(
    nsIAsyncInputStream* aInputStream,
    ParentToChildStreamActorManager* aManager) {
  MOZ_ASSERT(aInputStream);
  MOZ_ASSERT(aManager);

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

  if (!aManager->SendPParentToChildStreamConstructor(source)) {
    // no delete here, the manager will delete the actor for us.
    return nullptr;
  }

  source->ActorConstructed();
  return source;
}

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

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

namespace {

class IPCStreamDestinationParent final : public PChildToParentStreamParent,
                                         public IPCStreamDestination {
 public:
  nsresult Initialize() { return IPCStreamDestination::Initialize(); }

  ~IPCStreamDestinationParent() = default;

 private:
  // PChildToParentStreamParent 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

PChildToParentStreamParent* AllocPChildToParentStreamParent() {
  IPCStreamDestinationParent* actor = new IPCStreamDestinationParent();

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

  return actor;
}

void DeallocPChildToParentStreamParent(PChildToParentStreamParent* aActor) {
  delete aActor;
}

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

}  // namespace ipc
}  // namespace mozilla