ConnectedAccessoriesEnumerator_8cpp

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title: src/USB/ConnectedAccessoriesEnumerator.cpp

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src/USB/ConnectedAccessoriesEnumerator.cpp

Namespaces

Name
aasdk
aasdk::usb

Source code

// This file is part of aasdk library project.
// Copyright (C) 2018 f1x.studio (Michal Szwaj)
// Copyright (C) 2024 CubeOne (Simon Dean - simon.dean@cubeone.co.uk)
// Copyright (C) 2026 OpenCarDev (Matthew Hilton - matthilton2005@gmail.com)
//
// aasdk is free software: you can redistribute it and/or modify
// it under the terms of the GNU General Public License as published by
// the Free Software Foundation; either version 3 of the License, or
// (at your option) any later version.
//
// aasdk is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with aasdk. If not, see <http://www.gnu.org/licenses/>.

#include <aasdk/USB/ConnectedAccessoriesEnumerator.hpp>


namespace aasdk {
  namespace usb {

    ConnectedAccessoriesEnumerator::ConnectedAccessoriesEnumerator(IUSBWrapper &usbWrapper,
                                                                   boost::asio::io_service &ioService,
                                                                   IAccessoryModeQueryChainFactory &queryChainFactory)
        : usbWrapper_(usbWrapper), strand_(ioService), queryChainFactory_(queryChainFactory) {

    }

    void ConnectedAccessoriesEnumerator::enumerate(Promise::Pointer promise) {
      strand_.dispatch([this, self = this->shared_from_this(), promise = std::move(promise)]() mutable {
        if (promise_ != nullptr) {
          promise->reject(error::Error(error::ErrorCode::OPERATION_IN_PROGRESS));
        } else {
          promise_ = std::move(promise);

          auto result = usbWrapper_.getDeviceList(deviceListHandle_);

          if (result < 0) {
            promise_->reject(error::Error(error::ErrorCode::USB_LIST_DEVICES));
          } else if (deviceListHandle_->empty()) {
            promise_->resolve(false);
          } else {
            actualDeviceIter_ = deviceListHandle_->begin();
            this->queryNextDevice();
          }
        }
      });
    }

    void ConnectedAccessoriesEnumerator::cancel() {
      strand_.dispatch([this, self = this->shared_from_this()]() mutable {
        if (queryChain_ != nullptr) {
          queryChain_->cancel();
        }
      });
    }

    void ConnectedAccessoriesEnumerator::queryNextDevice() {
      auto deviceHandle = this->getNextDeviceHandle();

      if (deviceHandle != nullptr) {
        queryChain_ = queryChainFactory_.create();
        auto queryChainPromise = IAccessoryModeQueryChain::Promise::defer(strand_);

        queryChainPromise->then([this, self = this->shared_from_this()](DeviceHandle) mutable {
                                  promise_->resolve(true);
                                  this->reset();
                                },
                                [this, self = this->shared_from_this()](const error::Error &e) mutable {
                                  if (e != error::ErrorCode::OPERATION_ABORTED) {
                                    this->queryNextDevice();
                                  } else {
                                    promise_->reject(e);
                                    this->reset();
                                  }
                                });

        queryChain_->start(std::move(deviceHandle), std::move(queryChainPromise));
      } else if (actualDeviceIter_ == deviceListHandle_->end()) {
        promise_->resolve(false);
        this->reset();
      }
    }

    DeviceHandle ConnectedAccessoriesEnumerator::getNextDeviceHandle() {
      DeviceHandle handle;

      while (actualDeviceIter_ != deviceListHandle_->end()) {
        auto openResult = usbWrapper_.open(*actualDeviceIter_, handle);
        ++actualDeviceIter_;

        if (openResult == 0) {
          break;
        }
      }

      return handle;
    }

    void ConnectedAccessoriesEnumerator::reset() {
      queryChain_.reset();
      deviceListHandle_.reset();
      actualDeviceIter_ = DeviceList::iterator();
      promise_.reset();
    }

  }
}

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Updated on 2026-03-15 at 09:02:41 +0000