fix(sway): resolve destruction dependency between Ipc and SleeperThread

Ipc destructor closes socket and thus wakes up SleeperThread which was
waiting for socket data in Ipc::handleEvent.
Ipc::handleEvent then proceeds with sending signal to already destroyed
object, causing heap-use-after-free Address Sanitizer error.

src/modules/sway/ipc/client.cpp

@@ -10,19 +10,23 @@ Ipc::Ipc() {
 }
 
 Ipc::~Ipc() {
-  // To fail the IPC header
-  write(fd_, "close-sway-ipc", 14);
-  write(fd_event_, "close-sway-ipc", 14);
+  thread_.stop();
+
   if (fd_ > 0) {
+    // To fail the IPC header
+    write(fd_, "close-sway-ipc", 14);
     close(fd_);
     fd_ = -1;
   }
   if (fd_event_ > 0) {
+    write(fd_event_, "close-sway-ipc", 14);
     close(fd_event_);
     fd_event_ = -1;
   }
 }
 
+void Ipc::setWorker(std::function<void()>&& func) { thread_ = func; }
+
 const std::string Ipc::getSocketPath() const {
   const char* env = getenv("SWAYSOCK");
   if (env != nullptr) {

src/modules/sway/mode.cpp

@@ -8,7 +8,13 @@ Mode::Mode(const std::string& id, const Json::Value& config)
   ipc_.subscribe(R"(["mode"])");
   ipc_.signal_event.connect(sigc::mem_fun(*this, &Mode::onEvent));
   // Launch worker
-  worker();
+  ipc_.setWorker([this] {
+    try {
+      ipc_.handleEvent();
+    } catch (const std::exception& e) {
+      spdlog::error("Mode: {}", e.what());
+    }
+  });
   dp.emit();
 }
 
@@ -31,16 +37,6 @@ void Mode::onEvent(const struct Ipc::ipc_response& res) {
   }
 }
 
-void Mode::worker() {
-  thread_ = [this] {
-    try {
-      ipc_.handleEvent();
-    } catch (const std::exception& e) {
-      spdlog::error("Mode: {}", e.what());
-    }
-  };
-}
-
 auto Mode::update() -> void {
   if (mode_.empty()) {
     event_box_.hide();

src/modules/sway/window.cpp

@@ -11,7 +11,13 @@ Window::Window(const std::string& id, const Bar& bar, const Json::Value& config)
   // Get Initial focused window
   getTree();
   // Launch worker
-  worker();
+  ipc_.setWorker([this] {
+    try {
+      ipc_.handleEvent();
+    } catch (const std::exception& e) {
+      spdlog::error("Window: {}", e.what());
+    }
+  });
 }
 
 void Window::onEvent(const struct Ipc::ipc_response& res) { getTree(); }
@@ -28,16 +34,6 @@ void Window::onCmd(const struct Ipc::ipc_response& res) {
   }
 }
 
-void Window::worker() {
-  thread_ = [this] {
-    try {
-      ipc_.handleEvent();
-    } catch (const std::exception& e) {
-      spdlog::error("Window: {}", e.what());
-    }
-  };
-}
-
 auto Window::update() -> void {
   if (!old_app_id_.empty()) {
     bar_.window.get_style_context()->remove_class(old_app_id_);

src/modules/sway/workspaces.cpp

@@ -22,7 +22,13 @@ Workspaces::Workspaces(const std::string &id, const Bar &bar, const Json::Value
     window.signal_scroll_event().connect(sigc::mem_fun(*this, &Workspaces::handleScroll));
   }
   // Launch worker
-  worker();
+  ipc_.setWorker([this] {
+    try {
+      ipc_.handleEvent();
+    } catch (const std::exception &e) {
+      spdlog::error("Workspaces: {}", e.what());
+    }
+  });
 }
 
 void Workspaces::onEvent(const struct Ipc::ipc_response &res) {
@@ -102,16 +108,6 @@ void Workspaces::onCmd(const struct Ipc::ipc_response &res) {
   }
 }
 
-void Workspaces::worker() {
-  thread_ = [this] {
-    try {
-      ipc_.handleEvent();
-    } catch (const std::exception &e) {
-      spdlog::error("Workspaces: {}", e.what());
-    }
-  };
-}
-
 bool Workspaces::filterButtons() {
   bool needReorder = false;
   for (auto it = buttons_.begin(); it != buttons_.end();) {