Revert "Revert "Fix potential memory leaks""

This reverts commit 2d33c20 and
reapplies various patches for memory leaks.
The reason for the revert was a bug for a maximum duration interval
which caused sleep_for() to cause unpredictable behavior.

include/modules/upower/upower.hpp

@@ -69,7 +69,7 @@ class UPower : public AModule {
   UpDevice *displayDevice;
   guint login1_id;
   GDBusConnection *login1_connection;
-  UPowerTooltip *upower_tooltip;
+  std::unique_ptr<UPowerTooltip> upower_tooltip;
   std::string lastStatus;
   bool showAltText;
   bool upowerRunning;

include/modules/upower/upower_tooltip.hpp

@@ -2,6 +2,7 @@
 
 #include <libupower-glib/upower.h>
 
+#include <memory>
 #include <unordered_map>
 
 #include "gtkmm/box.h"
@@ -16,7 +17,7 @@ class UPowerTooltip : public Gtk::Window {
 
   const std::string getDeviceIcon(UpDeviceKind& kind);
 
-  Gtk::Box* contentBox;
+  std::unique_ptr<Gtk::Box> contentBox;
 
   uint iconSize;
   uint tooltipSpacing;

include/util/scope_guard.hpp

@@ -0,0 +1,21 @@
+#pragma once
+
+#include <utility>
+
+namespace waybar::util {
+
+template <typename Func>
+class scope_guard {
+ public:
+  explicit scope_guard(Func&& exit_function) : f{std::forward<Func>(exit_function)} {}
+  scope_guard(const scope_guard&) = delete;
+  scope_guard(scope_guard&&) = default;
+  scope_guard& operator=(const scope_guard&) = delete;
+  scope_guard& operator=(scope_guard&&) = default;
+  ~scope_guard() { f(); }
+
+ private:
+  Func f;
+};
+
+}  // namespace waybar::util

src/ALabel.cpp

@@ -12,7 +12,7 @@ ALabel::ALabel(const Json::Value& config, const std::string& name, const std::st
     : AModule(config, name, id, config["format-alt"].isString() || enable_click, enable_scroll),
       format_(config_["format"].isString() ? config_["format"].asString() : format),
       interval_(config_["interval"] == "once"
-                    ? std::chrono::seconds(100000000)
+                    ? std::chrono::seconds::max()
                     : std::chrono::seconds(
                           config_["interval"].isUInt() ? config_["interval"].asUInt() : interval)),
       default_format_(format_) {

src/modules/bluetooth.cpp

@@ -6,20 +6,26 @@
 #include <algorithm>
 #include <sstream>
 
+#include "util/scope_guard.hpp"
+
 namespace {
 
 using GDBusManager = std::unique_ptr<GDBusObjectManager, void (*)(GDBusObjectManager*)>;
 
 auto generateManager() -> GDBusManager {
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error) {
+      g_error_free(error);
+    }
+  });
   GDBusObjectManager* manager = g_dbus_object_manager_client_new_for_bus_sync(
       G_BUS_TYPE_SYSTEM,
       GDBusObjectManagerClientFlags::G_DBUS_OBJECT_MANAGER_CLIENT_FLAGS_DO_NOT_AUTO_START,
       "org.bluez", "/", NULL, NULL, NULL, NULL, &error);
 
   if (error) {
     spdlog::error("g_dbus_object_manager_client_new_for_bus_sync() failed: {}", error->message);
-    g_error_free(error);
   }
 
   auto destructor = [](GDBusObjectManager* manager) {

src/modules/cpu_usage/bsd.cpp

@@ -9,6 +9,7 @@
 #include <cstdlib>  // malloc
 
 #include "modules/cpu_usage.hpp"
+#include "util/scope_guard.hpp"
 
 #if defined(__NetBSD__) || defined(__OpenBSD__)
 #include <sys/sched.h>
@@ -33,6 +34,11 @@ std::vector<std::tuple<size_t, size_t>> waybar::modules::CpuUsage::parseCpuinfo(
   int ncpu = sysconf(_SC_NPROCESSORS_CONF);
   size_t sz = CPUSTATES * (ncpu + 1) * sizeof(pcp_time_t);
   pcp_time_t *cp_time = static_cast<pcp_time_t *>(malloc(sz)), *pcp_time = cp_time;
+  waybar::util::scope_guard cp_time_deleter([cp_time]() {
+    if (cp_time) {
+      free(cp_time);
+    }
+  });
 #if defined(__NetBSD__)
   int mib[] = {
       CTL_KERN,
@@ -97,6 +103,5 @@ std::vector<std::tuple<size_t, size_t>> waybar::modules::CpuUsage::parseCpuinfo(
     }
     cpuinfo.emplace_back(single_cp_time[CP_IDLE], total);
   }
-  free(cp_time);
   return cpuinfo;
 }

src/modules/custom.cpp

@@ -2,6 +2,8 @@
 
 #include <spdlog/spdlog.h>
 
+#include "util/scope_guard.hpp"
+
 waybar::modules::Custom::Custom(const std::string& name, const std::string& id,
                                 const Json::Value& config)
     : ALabel(config, "custom-" + name, id, "{}"),
@@ -57,6 +59,11 @@ void waybar::modules::Custom::continuousWorker() {
   }
   thread_ = [this, cmd] {
     char* buff = nullptr;
+    waybar::util::scope_guard buff_deleter([buff]() {
+      if (buff) {
+        free(buff);
+      }
+    });
     size_t len = 0;
     if (getline(&buff, &len, fp_) == -1) {
       int exit_code = 1;
@@ -90,7 +97,6 @@ void waybar::modules::Custom::continuousWorker() {
       output_ = {0, output};
       dp.emit();
     }
-    free(buff);
   };
 }
 

src/modules/mpris/mpris.cpp

@@ -6,6 +6,8 @@
 #include <sstream>
 #include <string>
 
+#include "util/scope_guard.hpp"
+
 extern "C" {
 #include <playerctl/playerctl.h>
 }
@@ -117,6 +119,11 @@ Mpris::Mpris(const std::string& id, const Json::Value& config)
   }
 
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error) {
+      g_error_free(error);
+    }
+  });
   manager = playerctl_player_manager_new(&error);
   if (error) {
     throw std::runtime_error(fmt::format("unable to create MPRIS client: {}", error->message));
@@ -136,9 +143,7 @@ Mpris::Mpris(const std::string& id, const Json::Value& config)
   } else {
     GList* players = playerctl_list_players(&error);
     if (error) {
-      auto e = fmt::format("unable to list players: {}", error->message);
-      g_error_free(error);
-      throw std::runtime_error(e);
+      throw std::runtime_error(fmt::format("unable to list players: {}", error->message));
     }
 
     for (auto p = players; p != NULL; p = p->next) {
@@ -410,8 +415,7 @@ auto Mpris::onPlayerNameAppeared(PlayerctlPlayerManager* manager, PlayerctlPlaye
     return;
   }
 
-  GError* error = nullptr;
-  mpris->player = playerctl_player_new_from_name(player_name, &error);
+  mpris->player = playerctl_player_new_from_name(player_name, NULL);
   g_object_connect(mpris->player, "signal::play", G_CALLBACK(onPlayerPlay), mpris, "signal::pause",
                    G_CALLBACK(onPlayerPause), mpris, "signal::stop", G_CALLBACK(onPlayerStop),
                    mpris, "signal::stop", G_CALLBACK(onPlayerStop), mpris, "signal::metadata",
@@ -478,6 +482,11 @@ auto Mpris::getPlayerInfo() -> std::optional<PlayerInfo> {
   }
 
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error) {
+      g_error_free(error);
+    }
+  });
 
   char* player_status = nullptr;
   auto player_playback_status = PLAYERCTL_PLAYBACK_STATUS_STOPPED;
@@ -487,9 +496,7 @@ auto Mpris::getPlayerInfo() -> std::optional<PlayerInfo> {
   if (player_name == "playerctld") {
     GList* players = playerctl_list_players(&error);
     if (error) {
-      auto e = fmt::format("unable to list players: {}", error->message);
-      g_error_free(error);
-      throw std::runtime_error(e);
+      throw std::runtime_error(fmt::format("unable to list players: {}", error->message));
     }
     // > get the list of players [..] in order of activity
     // https://github.com/altdesktop/playerctl/blob/b19a71cb9dba635df68d271bd2b3f6a99336a223/playerctl/playerctl-common.c#L248-L249
@@ -568,12 +575,16 @@ auto Mpris::getPlayerInfo() -> std::optional<PlayerInfo> {
 
 errorexit:
   spdlog::error("mpris[{}]: {}", info.name, error->message);
-  g_error_free(error);
   return std::nullopt;
 }
 
 bool Mpris::handleToggle(GdkEventButton* const& e) {
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error) {
+      g_error_free(error);
+    }
+  });
 
   auto info = getPlayerInfo();
   if (!info) return false;
@@ -603,7 +614,6 @@ bool Mpris::handleToggle(GdkEventButton* const& e) {
   if (error) {
     spdlog::error("mpris[{}]: error running builtin on-click action: {}", (*info).name,
                   error->message);
-    g_error_free(error);
     return false;
   }
   return true;

src/modules/sni/host.cpp

@@ -2,6 +2,8 @@
 
 #include <spdlog/spdlog.h>
 
+#include "util/scope_guard.hpp"
+
 namespace waybar::modules::SNI {
 
 Host::Host(const std::size_t id, const Json::Value& config, const Bar& bar,
@@ -57,17 +59,20 @@ void Host::nameVanished(const Glib::RefPtr<Gio::DBus::Connection>& conn, const G
 
 void Host::proxyReady(GObject* src, GAsyncResult* res, gpointer data) {
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error != nullptr) {
+      g_error_free(error);
+    }
+  });
   SnWatcher* watcher = sn_watcher_proxy_new_finish(res, &error);
   if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
     spdlog::error("Host: {}", error->message);
-    g_error_free(error);
     return;
   }
   auto host = static_cast<SNI::Host*>(data);
   host->watcher_ = watcher;
   if (error != nullptr) {
     spdlog::error("Host: {}", error->message);
-    g_error_free(error);
     return;
   }
   sn_watcher_call_register_host(host->watcher_, host->object_path_.c_str(), host->cancellable_,
@@ -76,16 +81,19 @@ void Host::proxyReady(GObject* src, GAsyncResult* res, gpointer data) {
 
 void Host::registerHost(GObject* src, GAsyncResult* res, gpointer data) {
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error != nullptr) {
+      g_error_free(error);
+    }
+  });
   sn_watcher_call_register_host_finish(SN_WATCHER(src), res, &error);
   if (g_error_matches(error, G_IO_ERROR, G_IO_ERROR_CANCELLED)) {
     spdlog::error("Host: {}", error->message);
-    g_error_free(error);
     return;
   }
   auto host = static_cast<SNI::Host*>(data);
   if (error != nullptr) {
     spdlog::error("Host: {}", error->message);
-    g_error_free(error);
     return;
   }
   g_signal_connect(host->watcher_, "item-registered", G_CALLBACK(&Host::itemRegistered), data);

src/modules/sni/watcher.cpp

@@ -2,6 +2,8 @@
 
 #include <spdlog/spdlog.h>
 
+#include "util/scope_guard.hpp"
+
 using namespace waybar::modules::SNI;
 
 Watcher::Watcher()
@@ -29,14 +31,18 @@ Watcher::~Watcher() {
 
 void Watcher::busAcquired(const Glib::RefPtr<Gio::DBus::Connection>& conn, Glib::ustring name) {
   GError* error = nullptr;
+  waybar::util::scope_guard error_deleter([error]() {
+    if (error) {
+      g_error_free(error);
+    }
+  });
   g_dbus_interface_skeleton_export(G_DBUS_INTERFACE_SKELETON(watcher_), conn->gobj(),
                                    "/StatusNotifierWatcher", &error);
   if (error != nullptr) {
     // Don't print an error when a watcher is already present
     if (error->code != 2) {
       spdlog::error("Watcher: {}", error->message);
     }
-    g_error_free(error);
     return;
   }
   g_signal_connect_swapped(watcher_, "handle-register-item",

src/modules/upower/upower.cpp

@@ -63,7 +63,7 @@ UPower::UPower(const std::string& id, const Json::Value& config)
   box_.set_has_tooltip(tooltip_enabled);
   if (tooltip_enabled) {
     // Sets the window to use when showing the tooltip
-    upower_tooltip = new UPowerTooltip(iconSize, tooltip_spacing, tooltip_padding);
+    upower_tooltip = std::make_unique<UPowerTooltip>(iconSize, tooltip_spacing, tooltip_padding);
     box_.set_tooltip_window(*upower_tooltip);
     box_.signal_query_tooltip().connect(sigc::mem_fun(*this, &UPower::show_tooltip_callback));
   }
@@ -72,14 +72,13 @@ UPower::UPower(const std::string& id, const Json::Value& config)
                                       G_BUS_NAME_WATCHER_FLAGS_AUTO_START, upowerAppear,
                                       upowerDisappear, this, NULL);
 
-  GError* error = NULL;
-  client = up_client_new_full(NULL, &error);
+  client = up_client_new_full(NULL, NULL);
   if (client == NULL) {
     throw std::runtime_error("Unable to create UPower client!");
   }
 
   // Connect to Login1 PrepareForSleep signal
-  login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
+  login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, NULL);
   if (!login1_connection) {
     throw std::runtime_error("Unable to connect to the SYSTEM Bus!...");
   } else {
@@ -99,6 +98,7 @@ UPower::UPower(const std::string& id, const Json::Value& config)
 }
 
 UPower::~UPower() {
+  if (displayDevice != NULL) g_object_unref(displayDevice);
   if (client != NULL) g_object_unref(client);
   if (login1_id > 0) {
     g_dbus_connection_signal_unsubscribe(login1_connection, login1_id);

src/modules/upower/upower_tooltip.cpp

@@ -9,11 +9,10 @@
 namespace waybar::modules::upower {
 UPowerTooltip::UPowerTooltip(uint iconSize_, uint tooltipSpacing_, uint tooltipPadding_)
     : Gtk::Window(),
+      contentBox(std::make_unique<Gtk::Box>(Gtk::ORIENTATION_VERTICAL)),
       iconSize(iconSize_),
       tooltipSpacing(tooltipSpacing_),
       tooltipPadding(tooltipPadding_) {
-  contentBox = new Gtk::Box(Gtk::ORIENTATION_VERTICAL);
-
   // Sets the Tooltip Padding
   contentBox->set_margin_top(tooltipPadding);
   contentBox->set_margin_bottom(tooltipPadding);

src/util/prepare_for_sleep.cpp

@@ -7,8 +7,7 @@ namespace {
 class PrepareForSleep {
  private:
   PrepareForSleep() {
-    GError *error = NULL;
-    login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, &error);
+    login1_connection = g_bus_get_sync(G_BUS_TYPE_SYSTEM, NULL, NULL);
     if (!login1_connection) {
       spdlog::warn("Unable to connect to the SYSTEM Bus!...");
     } else {