waybar/src/modules/sni/host.cpp

#include "modules/sni/host.hpp"

#include <iostream>

using namespace waybar::modules::SNI;

Host::Host(const std::size_t id, const Json::Value &config,
  const std::function<void(std::unique_ptr<Item>&)>& on_add,
  const std::function<void(std::unique_ptr<Item>&)>& on_remove)
: bus_name_("org.kde.StatusNotifierHost-" + std::to_string(getpid()) + "-" + std::to_string(id)),
  object_path_("/StatusNotifierHost/" + std::to_string(id)),
  bus_name_id_(Gio::DBus::own_name(Gio::DBus::BusType::BUS_TYPE_SESSION, bus_name_,
    sigc::mem_fun(*this, &Host::busAcquired))),
  config_(config), on_add_(on_add), on_remove_(on_remove)
{
}

Host::~Host()
{
  Gio::DBus::unwatch_name(bus_name_id_);
}

void Host::busAcquired(const Glib::RefPtr<Gio::DBus::Connection>& conn, Glib::ustring name)
{
  watcher_id_ = Gio::DBus::watch_name(conn, "org.kde.StatusNotifierWatcher",
    sigc::mem_fun(*this, &Host::nameAppeared), sigc::mem_fun(*this, &Host::nameVanished));
}

void Host::nameAppeared(const Glib::RefPtr<Gio::DBus::Connection>& conn, const Glib::ustring name,
  const Glib::ustring& name_owner)
{
  if (cancellable_ != nullptr) {
    // TODO
    return;
  }
  cancellable_ = g_cancellable_new();
  sn_watcher_proxy_new(
    conn->gobj(),
    G_DBUS_PROXY_FLAGS_NONE,
    "org.kde.StatusNotifierWatcher",
    "/StatusNotifierWatcher",
    cancellable_, &Host::proxyReady, this);
}

void Host::nameVanished(const Glib::RefPtr<Gio::DBus::Connection>& conn, const Glib::ustring name)
{
  g_cancellable_cancel(cancellable_);
  g_clear_object(&cancellable_);
  g_clear_object(&watcher_);
  items_.clear();
}

void Host::proxyReady(GObject* src, GAsyncResult* res,
  gpointer data)
{
  GError* error = nullptr;
  SnWatcher* watcher = sn_watcher_proxy_new_finish(res, &error);
  if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
    std::cerr << error->message << std::endl;
    g_error_free(error);
    return;
  }
  auto host = static_cast<SNI::Host *>(data);
  host->watcher_ = watcher;
  if (error != nullptr) {
    std::cerr << error->message << std::endl;
    g_error_free(error);
    return;
  }
  sn_watcher_call_register_host(
    host->watcher_, host->object_path_.c_str(), host->cancellable_,
    &Host::registerHost, data);
}

void Host::registerHost(GObject* src, GAsyncResult* res,
  gpointer data)
{
  GError* error = nullptr;
  sn_watcher_call_register_host_finish(SN_WATCHER(src), res, &error);
  if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
    std::cerr << error->message << std::endl;
    g_error_free(error);
    return;
  }
  auto host = static_cast<SNI::Host *>(data);
  if (error != nullptr) {
    std::cerr << error->message << std::endl;
    g_error_free(error);
    return; 
  }
  g_signal_connect(host->watcher_, "item-registered",
    G_CALLBACK(&Host::itemRegistered), data);
  g_signal_connect(host->watcher_, "item-unregistered",
    G_CALLBACK(&Host::itemUnregistered), data);
  auto items = sn_watcher_dup_registered_items(host->watcher_);
  if (items) {
    for (uint32_t i = 0; items[i] != nullptr; i += 1) {
      host->addRegisteredItem(items[i]);
    }
  }
  g_strfreev(items);
}

void Host::itemRegistered(SnWatcher* watcher, const gchar* service, gpointer data)
{
  auto host = static_cast<SNI::Host *>(data);
  host->addRegisteredItem(service);
}

void Host::itemUnregistered(
  SnWatcher* watcher, const gchar* service, gpointer data)
{
  auto host = static_cast<SNI::Host *>(data);
  auto [bus_name, object_path] = host->getBusNameAndObjectPath(service);
  for (auto it = host->items_.begin(); it != host->items_.end(); ++it) {
    if ((*it)->bus_name == bus_name && (*it)->object_path == object_path) {
      host->on_remove_(*it);
      host->items_.erase(it);
      break;
    }
  }
}

std::tuple<std::string, std::string> Host::getBusNameAndObjectPath(
  const std::string service)
{
  auto it = service.find("/");
  if (it != std::string::npos) {
    return {service.substr(0, it), service.substr(it)};
  }
  return {service, "/StatusNotifierItem"};
}

void Host::addRegisteredItem(std::string service)
{
  auto [bus_name, object_path] = getBusNameAndObjectPath(service);
  items_.emplace_back(new Item(bus_name, object_path, config_));
  on_add_(items_.back());
}