jyoung/tools/cabana/streams/socketcanstream.cc

#include "tools/cabana/streams/socketcanstream.h"

#include <QDebug>
#include <QFormLayout>
#include <QHBoxLayout>
#include <QMessageBox>
#include <QPushButton>
#include <QThread>

SocketCanStream::SocketCanStream(QObject *parent, SocketCanStreamConfig config_) : config(config_), LiveStream(parent) {
  if (!available()) {
    throw std::runtime_error("SocketCAN plugin not available");
  }

  qDebug() << "Connecting to SocketCAN device" << config.device;
  if (!connect()) {
    throw std::runtime_error("Failed to connect to SocketCAN device");
  }
}

bool SocketCanStream::available() {
  return QCanBus::instance()->plugins().contains("socketcan");
}

bool SocketCanStream::connect() {
  // Connecting might generate some warnings about missing socketcan/libsocketcan libraries
  // These are expected and can be ignored, we don't need the advanced features of libsocketcan
  QString errorString;
  device.reset(QCanBus::instance()->createDevice("socketcan", config.device, &errorString));

  if (!device) {
    qDebug() << "Failed to create SocketCAN device" << errorString;
    return false;
  }

  if (!device->connectDevice()) {
    qDebug() << "Failed to connect to device";
    return false;
  }

  return true;
}

void SocketCanStream::streamThread() {
  while (!QThread::currentThread()->isInterruptionRequested()) {
    QThread::msleep(1);

    auto frames = device->readAllFrames();
    if (frames.size() == 0) continue;

    MessageBuilder msg;
    auto evt = msg.initEvent();
    auto canData = evt.initCan(frames.size());

    for (uint i = 0; i < frames.size(); i++) {
      if (!frames[i].isValid()) continue;

      canData[i].setAddress(frames[i].frameId());
      canData[i].setSrc(0);

      auto payload = frames[i].payload();
      canData[i].setDat(kj::arrayPtr((uint8_t*)payload.data(), payload.size()));
    }

    handleEvent(capnp::messageToFlatArray(msg));
  }
}

AbstractOpenStreamWidget *SocketCanStream::widget(AbstractStream **stream) {
  return new OpenSocketCanWidget(stream);
}

OpenSocketCanWidget::OpenSocketCanWidget(AbstractStream **stream) : AbstractOpenStreamWidget(stream) {
  QVBoxLayout *main_layout = new QVBoxLayout(this);
  main_layout->addStretch(1);

  QFormLayout *form_layout = new QFormLayout();

  QHBoxLayout *device_layout = new QHBoxLayout();
  device_edit = new QComboBox();
  device_edit->setFixedWidth(300);
  device_layout->addWidget(device_edit);

  QPushButton *refresh = new QPushButton(tr("Refresh"));
  refresh->setFixedWidth(100);
  device_layout->addWidget(refresh);
  form_layout->addRow(tr("Device"), device_layout);
  main_layout->addLayout(form_layout);

  main_layout->addStretch(1);

  QObject::connect(refresh, &QPushButton::clicked, this, &OpenSocketCanWidget::refreshDevices);
  QObject::connect(device_edit, &QComboBox::currentTextChanged, this, [=]{ config.device = device_edit->currentText(); });

  // Populate devices
  refreshDevices();
}

void OpenSocketCanWidget::refreshDevices() {
  device_edit->clear();
  for (auto device : QCanBus::instance()->availableDevices(QStringLiteral("socketcan"))) {
    device_edit->addItem(device.name());
  }
}


bool OpenSocketCanWidget::open() {
  try {
    *stream = new SocketCanStream(qApp, config);
  } catch (std::exception &e) {
    QMessageBox::warning(nullptr, tr("Warning"), tr("Failed to connect to SocketCAN device: '%1'").arg(e.what()));
    return false;
  }
  return true;
}