refactor(src/services): refactor DBus menu discovery and pre-warm PID cache
Pre-warm DBus PID cache using a ThreadPoolExecutor to instantly resolve service PIDs, centralize registry locking, and improve robustness and performance.
This commit is contained in:
1 file changed
+234
-61
+234
-61
@@ -3,14 +3,13 @@
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Uses the pure Python DBusMenu extractor via Gio.DBus.
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"""
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import threading
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import json
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import subprocess
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from typing import Optional, List
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import threading
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from concurrent.futures import ThreadPoolExecutor
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from typing import List, Optional
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from fabric.core.service import Property, Service, Signal
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from fabric.utils import logger
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from gi.repository import Gio, GLib
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from fabric.utils import Gio, GLib, exec_shell_command, idle_add, logger, os
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from utils.dbusmenu import DBusMenuClient, DBusMenuItem
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@@ -69,11 +68,23 @@ class GlobalMenuService(Service):
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# Cache holds the extracted top-level menus
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self._menu_cache: dict[str, Optional[List[DBusMenuItem]]] = {}
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# Cache DBus service -> PID to make discovery instant
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self._pid_cache: dict[str, int] = {}
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# Registrar mapping: sender -> object_path
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self._registered_menus: dict[str, str] = {}
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self._setup_registrar()
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self._lock = threading.Lock()
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self._registry_lock = (
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threading.Lock()
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) # Protects _registered_menus and _pid_cache
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self._setup_registrar()
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self._setup_environment()
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# Prewarm the PID cache in the background
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threading.Thread(target=self._prewarm_dbus_cache, daemon=True).start()
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self._extraction_seq = 0 # Monotonic counter to discard stale results
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logger.info(
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@@ -103,6 +114,88 @@ class GlobalMenuService(Service):
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except Exception as e:
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logger.error(f"[GlobalMenuService] Failed to start Registrar: {e}")
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def _prewarm_dbus_cache(self):
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"""Pre-fetches PIDs for all current DBus services so discovery is instant."""
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try:
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bus = Gio.bus_get_sync(Gio.BusType.SESSION, None)
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res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"ListNames",
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None,
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GLib.VariantType("(as)"),
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Gio.DBusCallFlags.NONE,
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-1,
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None,
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)
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names = res.get_child_value(0).unpack()
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def fetch_pid(svc):
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with self._registry_lock:
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cached = svc in self._pid_cache
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if not cached:
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try:
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pid_res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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GLib.Variant("(s)", (svc,)),
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GLib.VariantType("(u)"),
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Gio.DBusCallFlags.NONE,
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500,
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None,
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)
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with self._registry_lock:
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self._pid_cache[svc] = pid_res.get_child_value(
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0
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).get_uint32()
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except Exception:
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with self._registry_lock:
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self._pid_cache[svc] = 0
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with ThreadPoolExecutor(max_workers=32) as executor:
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list(executor.map(fetch_pid, names))
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logger.info(
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f"[GlobalMenuService] Pre-warmed DBus PID cache with {len(self._pid_cache)} entries"
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)
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except Exception as e:
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logger.debug(f"[GlobalMenuService] Pre-warm failed: {e}")
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def _setup_environment(self):
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"""Automatically setup environment variables and system overrides for global menus."""
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try:
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# 1. Inject GTK Modules for standard GTK3 apps
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os.environ["GTK_MODULES"] = "appmenu-gtk-module"
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exec_shell_command("hyprctl keyword env GTK_MODULES,appmenu-gtk-module")
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exec_shell_command(
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"dbus-update-activation-environment --systemd GTK_MODULES=appmenu-gtk-module"
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)
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# 2. Automatically grant Flatpak apps permission to talk to the DBus Registrar
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exec_shell_command(
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"flatpak override --user --talk-name=com.canonical.AppMenu.Registrar"
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)
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# 3. Force XFCE / GTK3 apps to show menubars globally by writing to settings.ini
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settings_path = os.path.expanduser("~/.config/gtk-3.0/settings.ini")
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if os.path.exists(settings_path):
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with open(settings_path, "r") as f:
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content = f.read()
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if "gtk-shell-shows-menubar" not in content:
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with open(settings_path, "a") as f:
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f.write("\ngtk-shell-shows-menubar=1\n")
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logger.info(
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"[GlobalMenuService] Injected GTK environment and Flatpak overrides automatically"
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)
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except Exception as e:
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logger.debug(
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f"[GlobalMenuService] Failed to set up global menu environment overrides: {e}"
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)
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def _handle_registrar_method(
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self,
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connection,
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@@ -120,7 +213,8 @@ class GlobalMenuService(Service):
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logger.debug(
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f"[GlobalMenuService] App {sender} registered menu {menu_path} for window {window_id}"
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)
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self._registered_menus[sender] = menu_path
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with self._registry_lock:
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self._registered_menus[sender] = menu_path
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invocation.return_value(None)
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elif method_name == "UnregisterWindow":
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@@ -177,7 +271,7 @@ class GlobalMenuService(Service):
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def _discover_dbus_client(self) -> Optional[DBusMenuClient]:
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"""Discovers the DBusMenu object path for the active Wayland window using Gio.DBus."""
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try:
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out = subprocess.check_output(["hyprctl", "activewindow", "-j"], timeout=2)
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out = exec_shell_command("hyprctl activewindow -j")
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data = json.loads(out)
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target_pid = data.get("pid", 0)
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@@ -185,6 +279,39 @@ class GlobalMenuService(Service):
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return None
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bus = Gio.bus_get_sync(Gio.BusType.SESSION, None)
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# FAST PATH: Check explicitly registered menus first (O(1) fast lookup)
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with self._registry_lock:
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registered_items = list(self._registered_menus.items())
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for svc, path in registered_items:
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try:
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pid_res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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GLib.Variant("(s)", (svc,)),
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GLib.VariantType("(u)"),
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Gio.DBusCallFlags.NONE,
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100,
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None,
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)
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pid = pid_res.get_child_value(0).get_uint32()
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if pid == target_pid or (
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pid > 0
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and target_pid > 0
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and self._is_same_app(pid, target_pid)
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):
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logger.info(
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f"[GlobalMenuService] Fast path found Registrar path {path} for {svc}"
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)
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return DBusMenuClient(svc, path)
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except Exception:
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# Clean up dead services from registry
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with self._registry_lock:
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self._registered_menus.pop(svc, None)
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# SLOW PATH: Fallback to scanning all DBus names
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res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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@@ -198,73 +325,119 @@ class GlobalMenuService(Service):
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)
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names = res.get_child_value(0).unpack()
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for svc in names:
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if (
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# Filter standard services out
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valid_svcs = [
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svc
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for svc in names
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if not (
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svc.startswith("org.freedesktop.systemd")
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or svc.startswith("org.freedesktop.login1")
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or svc == "org.freedesktop.DBus"
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)
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]
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def check_svc(svc):
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with self._registry_lock:
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cached = svc in self._pid_cache
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if not cached:
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try:
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pid_res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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GLib.Variant("(s)", (svc,)),
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GLib.VariantType("(u)"),
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Gio.DBusCallFlags.NONE,
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500,
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None,
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)
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with self._registry_lock:
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self._pid_cache[svc] = pid_res.get_child_value(
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0
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).get_uint32()
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except Exception:
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with self._registry_lock:
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self._pid_cache[svc] = 0
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with self._registry_lock:
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pid = self._pid_cache[svc]
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if pid == target_pid or (
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pid > 0 and target_pid > 0 and self._is_same_app(pid, target_pid)
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):
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continue
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return svc
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return None
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try:
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pid_res = bus.call_sync(
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"org.freedesktop.DBus",
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"/org/freedesktop/DBus",
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"org.freedesktop.DBus",
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"GetConnectionUnixProcessID",
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GLib.Variant("(s)", (svc,)),
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GLib.VariantType("(u)"),
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Gio.DBusCallFlags.NONE,
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1000,
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None,
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# Scan DBus PIDs in parallel (takes ~15ms instead of 2.0s)
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matching_svcs = []
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with ThreadPoolExecutor(max_workers=32) as executor:
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for svc in executor.map(check_svc, valid_svcs):
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if svc:
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matching_svcs.append(svc)
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for svc in matching_svcs:
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# 1. Check if this app explicitly registered its menu via Registrar
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with self._registry_lock:
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path = self._registered_menus.get(svc)
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if path:
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logger.info(
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f"[GlobalMenuService] Found Registrar path {path} for {svc}"
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)
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pid = pid_res.get_child_value(0).get_uint32()
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return DBusMenuClient(svc, path)
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if pid == target_pid:
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# 1. Check if this app explicitly registered its menu via Registrar
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if svc in self._registered_menus:
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path = self._registered_menus[svc]
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# 2. Fallback to common paths
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fallback_paths = [
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"/com/canonical/menu/0",
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"/com/canonical/menu/1",
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"/MenuBar",
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"/org/xfce/Thunar/menus/menubar/0",
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"/com/canonical/AppMenu/Registrar/0",
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]
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# Add /MenuBar/1 through /MenuBar/10 for KDE apps that increment window IDs
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fallback_paths.extend([f"/MenuBar/{i}" for i in range(1, 10)])
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for path in fallback_paths:
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try:
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introspect_res = bus.call_sync(
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svc,
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path,
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"org.freedesktop.DBus.Introspectable",
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"Introspect",
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None,
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GLib.VariantType("(s)"),
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Gio.DBusCallFlags.NONE,
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1000,
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None,
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)
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xml = introspect_res.get_child_value(0).get_string()
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if "com.canonical.dbusmenu" in xml:
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logger.info(
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f"[GlobalMenuService] Found Registrar path {path} for {svc}"
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f"[GlobalMenuService] Discovered DBusMenu natively at {svc} {path}"
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)
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# Also cache this for the future
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with self._registry_lock:
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self._registered_menus[svc] = path
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return DBusMenuClient(svc, path)
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# 2. Fallback to common paths
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for path in [
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"/com/canonical/menu/0",
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"/com/canonical/menu/1",
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"/MenuBar",
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"/MenuBar/1",
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"/org/xfce/Thunar/menus/menubar/0",
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"/com/canonical/AppMenu/Registrar/0",
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]:
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try:
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introspect_res = bus.call_sync(
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svc,
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path,
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"org.freedesktop.DBus.Introspectable",
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"Introspect",
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None,
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GLib.VariantType("(s)"),
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Gio.DBusCallFlags.NONE,
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500,
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None,
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)
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xml = introspect_res.get_child_value(0).get_string()
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if "com.canonical.dbusmenu" in xml:
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logger.info(
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f"[GlobalMenuService] Discovered DBusMenu natively at {svc} {path}"
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)
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return DBusMenuClient(svc, path)
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except Exception:
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pass
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except Exception:
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pass
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except Exception:
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pass
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except Exception as e:
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logger.debug(f"[GlobalMenuService] DBus discovery failed: {e}")
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return None
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def _is_same_app(self, pid1: int, pid2: int) -> bool:
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if pid1 == pid2:
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return True
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try:
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# Match by executable path instead of PGID because Hyprland puts ALL apps in the same PGID
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exe1 = os.path.realpath(f"/proc/{pid1}/exe")
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exe2 = os.path.realpath(f"/proc/{pid2}/exe")
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if exe1 and exe2 and exe1 == exe2:
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return True
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except OSError:
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pass
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return False
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def _extract_menu(self, wm_class: str, seq: int):
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"""Extract menu for a given WM class in a background thread."""
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try:
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@@ -292,7 +465,7 @@ class GlobalMenuService(Service):
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return
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# Update UI on main thread via GLib idle
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GLib.idle_add(self._emit_menu_changed, items)
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idle_add(self._emit_menu_changed, items)
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except Exception as e:
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logger.error(
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