Reload all devices after wake from suspend

include/modules/upower/upower.hpp

@@ -25,6 +25,10 @@ class UPower : public AModule {
   static void deviceAdded_cb(UpClient *client, UpDevice *device, gpointer data);
   static void deviceRemoved_cb(UpClient *client, const gchar *object_path, gpointer data);
   static void deviceNotify_cb(gpointer data);
+  static void prepareForSleep_cb(GDBusConnection *system_bus, const gchar *sender_name,
+                                 const gchar *object_path, const gchar *interface_name,
+                                 const gchar *signal_name, GVariant *parameters,
+                                 gpointer user_data);
   void        removeDevice(const std::string devicePath);
   void        addDevice(UpDevice *device);
   void        setDisplayDevice();
@@ -41,6 +45,8 @@ class UPower : public AModule {
   UpClient                         *client = NULL;
   UpDevice                         *displayDevice = NULL;
   std::map<std::string, UpDevice *> devices;
+  guint                             login1_id;
+  GDBusConnection                  *login1_connection;
 };
 
 }  // namespace waybar::modules

meson.build

@@ -86,7 +86,7 @@ wayland_cursor = dependency('wayland-cursor')
 wayland_protos = dependency('wayland-protocols')
 gtkmm = dependency('gtkmm-3.0', version : ['>=3.22.0'])
 dbusmenu_gtk = dependency('dbusmenu-gtk3-0.4', required: get_option('dbusmenu-gtk'))
-giounix = dependency('gio-unix-2.0', required: (get_option('dbusmenu-gtk').enabled() or get_option('logind').enabled()))
+giounix = dependency('gio-unix-2.0', required: (get_option('dbusmenu-gtk').enabled() or get_option('logind').enabled() or get_option('upower_glib').enabled()))
 jsoncpp = dependency('jsoncpp')
 sigcpp = dependency('sigc++-2.0')
 libepoll = dependency('epoll-shim', required: false)
@@ -204,7 +204,7 @@ if libnl.found() and libnlgen.found()
     src_files += 'src/modules/network.cpp'
 endif
 
-if upower_glib.found()
+if (upower_glib.found() and giounix.found() and not get_option('logind').disabled())
     add_project_arguments('-DHAVE_UPOWER', language: 'cpp')
     src_files += 'src/modules/upower/upower.cpp'
 endif

src/modules/upower/upower.cpp

@@ -1,5 +1,7 @@
 #include "modules/upower/upower.hpp"
 
+#include <gio/gio.h>
+
 #include <iostream>
 #include <map>
 #include <string>
@@ -35,7 +37,22 @@ UPower::UPower(const std::string& id, const Json::Value& config)
     throw std::runtime_error("Unable to create UPower client!");
   }
 
-  // TODO: Connect to login1 prepare_for_sleep signal
+  // Connect to Login1 PrepareForSleep signal
+  login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
+  if (!login1_connection) {
+    throw std::runtime_error("Unable to connect to the SYSTEM Bus!...");
+  } else {
+    login1_id = g_dbus_connection_signal_subscribe(login1_connection,
+                                                   "org.freedesktop.login1",
+                                                   "org.freedesktop.login1.Manager",
+                                                   "PrepareForSleep",
+                                                   "/org/freedesktop/login1",
+                                                   NULL,
+                                                   G_DBUS_SIGNAL_FLAGS_NONE,
+                                                   prepareForSleep_cb,
+                                                   this,
+                                                   NULL);
+  }
 
   g_signal_connect(client, "device-added", G_CALLBACK(deviceAdded_cb), this);
   g_signal_connect(client, "device-removed", G_CALLBACK(deviceRemoved_cb), this);
@@ -46,7 +63,13 @@ UPower::UPower(const std::string& id, const Json::Value& config)
   dp.emit();
 }
 
-UPower::~UPower() {}
+UPower::~UPower() {
+  if (client != NULL) g_object_unref(client);
+  if (login1_id > 0) {
+    g_dbus_connection_signal_unsubscribe(login1_connection, login1_id);
+    login1_id = 0;
+  }
+}
 
 void UPower::deviceAdded_cb(UpClient* client, UpDevice* device, gpointer data) {
   UPower* up = static_cast<UPower*>(data);
@@ -67,6 +90,19 @@ void UPower::deviceNotify_cb(gpointer data) {
   // Update the widget
   up->dp.emit();
 }
+void UPower::prepareForSleep_cb(GDBusConnection* system_bus, const gchar* sender_name,
+                                const gchar* object_path, const gchar* interface_name,
+                                const gchar* signal_name, GVariant* parameters, gpointer data) {
+  if (g_variant_is_of_type(parameters, G_VARIANT_TYPE("(b)"))) {
+    gboolean sleeping;
+    g_variant_get(parameters, "(b)", &sleeping);
+
+    if (!sleeping) {
+      UPower* up = static_cast<UPower*>(data);
+      up->resetDevices();
+    }
+  }
+}
 
 void UPower::removeDevice(const std::string devicePath) { devices.erase(devicePath); }