SerialPort.h - mozsearch

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */

/* vim:set ts=2 sw=2 sts=2 et cindent: */

/* 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/. */

#ifndef mozilla_dom_SerialPort_h

#define mozilla_dom_SerialPort_h

#include "mozilla/DOMEventTargetHelper.h"

#include "mozilla/dom/SerialPortChild.h"

#include "mozilla/dom/SerialPortInfo.h"

#include "mozilla/dom/WorkerRef.h"

namespace mozilla::ipc {

class DataPipeReceiver;

class DataPipeSender;

}  // namespace mozilla::ipc

namespace mozilla::dom {

class Promise;

class ReadableStream;

class Serial;

class SerialPortReadAlgorithms;

class SerialPortWriteAlgorithms;

class WritableStream;

struct SerialOptions;

struct SerialOutputSignals;

struct SerialPortInfo;

class SerialPort final : public DOMEventTargetHelper {

 public:

  NS_DECL_ISUPPORTS_INHERITED

  NS_DECL_CYCLE_COLLECTION_CLASS_INHERITED(SerialPort, DOMEventTargetHelper)

  SerialPort(const IPCSerialPortInfo& aInfo, Serial* aSerial);

  void EventListenerAdded(nsAtom* aType) override;

  void EventListenerRemoved(nsAtom* aType) override;

  JSObject* WrapObject(JSContext* aCx,

                       JS::Handle<JSObject*> aGivenProto) override;

  void GetEventTargetParent(EventChainPreVisitor& aVisitor) override;

  already_AddRefed<Promise> Open(const SerialOptions& aOptions,

                                 ErrorResult& aRv);

  already_AddRefed<Promise> SetSignals(const SerialOutputSignals& aSignals,

                                       ErrorResult& aRv);

  already_AddRefed<Promise> GetSignals(ErrorResult& aRv);

  MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> Close(ErrorResult& aRv);

  MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> Forget(ErrorResult& aRv);

  // Mark this port as forgotten without the full Forget() flow (no IPC,

  // no manager callback). Used when another context (e.g. a worker) has

  // already performed the forget and the manager has been updated.

  MOZ_CAN_RUN_SCRIPT void MarkForgotten();

  // https://wicg.github.io/serial/#dom-serialport-connected

  // Returns this.[[connected]]: whether the device is physically connected.

  bool Connected() const { return mPhysicallyPresent; }

  bool IsForgotten() const {

    return mForgottenState == ForgottenState::Forgotten;

  // Returns whether the device is physically connected to the system.

  // This does not indicate whether the port is open or being used.

  bool PhysicallyPresent() const { return mPhysicallyPresent; }

  // Silently marks this port as physically present without dispatching a

  // connect event. Used when returning a port from requestPort(), since the

  // port is guaranteed to be connected (GetAvailablePorts only lists connected

  // devices) but the async RecvPortConnected notification may not have arrived.

  void MarkPhysicallyPresent() { mPhysicallyPresent = true; }

  void GetInfo(SerialPortInfo& aRetVal, ErrorResult& aRv);

  MOZ_CAN_RUN_SCRIPT ReadableStream* GetReadable();

  // https://wicg.github.io/serial/#dom-serialport-writable

  MOZ_CAN_RUN_SCRIPT WritableStream* GetWritable();

  IMPL_EVENT_HANDLER(connect)

  IMPL_EVENT_HANDLER(disconnect)

  const nsString& Id() const { return mInfo.id(); }

  const IPCSerialPortInfo& GetPortInfo() const { return mInfo; }

  MOZ_CAN_RUN_SCRIPT void NotifyConnected();

  MOZ_CAN_RUN_SCRIPT void NotifyDisconnected();

  // Called when the PSerialPort child actor is destroyed externally (e.g.

  // by the parent closing the channel due to permission revocation).

  MOZ_CAN_RUN_SCRIPT void OnActorDestroyed();

  MOZ_CAN_RUN_SCRIPT_BOUNDARY void Shutdown();

  void DisconnectFromOwner() override;

  RefPtr<SerialPortChild> GetChild() const { return mChild; }

  void SetChild(SerialPortChild* aChild) { mChild = aChild; }

 private:

  ~SerialPort() override;

  MOZ_CAN_RUN_SCRIPT ReadableStream* CreateReadableStream();

  MOZ_CAN_RUN_SCRIPT WritableStream* CreateWritableStream();

  void CloseAfterStreamsClosed();

  void SettleClosePromise(nsresult aResult);

  MOZ_CAN_RUN_SCRIPT already_AddRefed<Promise> CloseStreams();

  void NotifySharingStateChanged(bool aConnected);

  void UpdateWorkerRef();

  RefPtr<Serial> mSerial;

  IPCSerialPortInfo mInfo;

  // Whether the port is currently open (between Open() and Close())

  bool mIsOpen = false;

  // Whether the hardware device is physically connected to the system

  bool mPhysicallyPresent = true;

  bool mHasShutdown = false;

  // Whether the user has called forget() on this port

  enum class ForgottenState { NotForgotten, Forgetting, Forgotten };

  ForgottenState mForgottenState = ForgottenState::NotForgotten;

  uint32_t mBufferSize = 0;

  uint32_t mPipeCapacity = 0;

  RefPtr<ReadableStream> mReadable;

  RefPtr<WritableStream> mWritable;

  RefPtr<SerialPortChild> mChild;

  RefPtr<Promise> mOpenPromise;

  RefPtr<Promise> mClosePromise;

  // Prevents the worker from shutting down while this port is open or

  // has connect/disconnect event listeners. Managed by UpdateWorkerRef().

  RefPtr<StrongWorkerRef> mWorkerRef;

};

}  // namespace mozilla::dom

#endif  // mozilla_dom_SerialPort_h