Stabilize panel speed label width

Cap formatBytesShort at four characters by rolling the mantissa up to the
next unit once it reaches 1000, and give .sbx-speed-label a fixed min-width
so the panel widget no longer shifts horizontally as speed values change.

Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

LICENSE

@@ -0,0 +1,21 @@
+MIT License
+
+Copyright (c) 2026 Anton Vakhrushev
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.

README.md

@@ -7,20 +7,33 @@ GNOME, используя встроенный **Clash API**.
 
 **В панели (компактно):**
 
-- монохромный индикатор-кружок — залит, когда API доступен и прокси жив; полый
+- монохромный индикатор-кружок (цвет берётся из цвета текста панели, поэтому
-  (тускнее), когда API недоступен. Цвет берётся из цвета текста панели, поэтому
+  индикатор одинаково читается на тёмной и светлой теме):
-  индикатор одинаково читается на тёмной и светлой теме;
+  - **яркий залитый круг** — сервис работает и через активный outbound есть связь;
-- имя активного outbound (текущий узел Selector-группы);
+  - **тусклый залитый круг** — сервис работает, связь ещё проверяется;
-- текущую скорость, например `↓2.4M ↑120k`.
+  - **яркое сплошное кольцо** — сервис работает, но связи через outbound нет;
+  - **пунктирное тусклое кольцо** — сервис (Clash API) недоступен / подключение.
+
+  Различие «есть связь / нет связи / проверяется» доступно только при включённой
+  опции «Connectivity check» (см. ниже) — иначе кружок просто залит, когда API
+  отвечает, и пунктирный, когда нет. Связь измеряется только для узла группы,
+  показанной в панели; реальный трафик может идти по другим правилам и группам —
+  см. разбивку соединений в меню;
+- имя активного outbound (текущий узел группы);
+- текущую скорость, например `↓2.4M ↑120K`.
 
 **В выпадающем меню (подробности):**
 
-- `sing-box · Active / Unreachable`;
+- строка статуса: `sing-box · Active` / `Unreachable`, а при включённой проверке
+  связности также `Active (checking…)` (связь проверяется) и `No connectivity`
+  (связи через outbound нет);
 - полная скорость (`↓ 2.4 MB/s   ↑ 120 KB/s`);
-- каждая Selector-группа отдельным подменю — выбор узла **переключает активный
+- каждая группа outbound'ов отдельным подменю. **Selector**-группы переключаемы —
-  outbound** (текущий помечен точкой, рядом — последняя измеренная задержка, если она
+  выбор узла меняет активный outbound; **URLTest/Fallback**-группы показываются только
-  есть). Пункт **Test latency** в подменю запускает ручной замер задержки всех узлов
+  для просмотра (узел выбирает сам sing-box). Текущий узел помечен точкой, рядом —
-  группы и обновляет значения на месте (меню при этом не закрывается);
+  последняя измеренная задержка, если она есть. Пункт **Test latency** в подменю
+  запускает ручной замер задержки всех узлов группы по адресу `connectivity-url` и
+  обновляет значения на месте (меню при этом не закрывается);
 - число активных соединений с разбивкой по outbound;
 - **Open dashboard** (MetaCubeXD или ваш дашборд Clash) и **Settings**.
 
@@ -41,23 +54,86 @@ GNOME, используя встроенный **Clash API**.
 }
 ```
 
-## Установка (из исходников)
+## Установка
+
+Полная последовательность после свежего `git clone` (в репозитории нет собранной
+схемы — её нужно скомпилировать локально, шаг 3):
 
 ```sh
+# 1. Клонировать репозиторий
+git clone https://git.vakhrushev.me/av/sing-box-gnome-extension.git
+cd sing-box-gnome-extension
+
+# 2. Установить как пользовательское расширение. Симлинк на клон удобен тем, что
+#    обновления затем подтягиваются простым `git pull` (не удаляйте каталог клона).
 UUID="sing-box-status@git.vakhrushev.me"
+mkdir -p "$HOME/.local/share/gnome-shell/extensions"
 ln -s "$PWD" "$HOME/.local/share/gnome-shell/extensions/$UUID"
+
+# 3. Скомпилировать схему GSettings (обязательно: gschemas.compiled не хранится в git)
 glib-compile-schemas schemas/
-# На Wayland: выйдите из сессии и войдите снова, чтобы shell зарегистрировал
+
-# новое расширение, затем:
+# 4. Перезапустить GNOME Shell, чтобы он увидел новое расширение:
+#      X11     — Alt+F2, ввести «r», Enter
+#      Wayland — выйти из сессии и войти снова (перезапуск на лету невозможен)
+
+# 5. Включить расширение
 gnome-extensions enable "$UUID"
 ```
 
-Откройте **Settings** из меню (или `gnome-extensions prefs "$UUID"`) и задайте:
+Вместо симлинка можно скопировать файлы
+(`cp -r . "$HOME/.local/share/gnome-shell/extensions/$UUID"`), но тогда каждое
+обновление придётся копировать заново.
+
+Проверить состояние:
+
+```sh
+gnome-extensions info sing-box-status@git.vakhrushev.me   # ENABLED / DISABLED / ошибки
+```
+
+После включения откройте **Settings** из меню расширения (или
+`gnome-extensions prefs "$UUID"`) и задайте:
 
 - **API URL** — например `http://127.0.0.1:9090` (ваш `external_controller`);
 - **Secret** — ваш `clash_api.secret`;
 - **Dashboard URL** — например `http://127.0.0.1:9091`.
 
+### Обновление
+
+```sh
+cd sing-box-gnome-extension && git pull
+glib-compile-schemas schemas/          # если менялась схема
+# перезапуск GNOME Shell (см. шаг 4) — на Wayland через перелогин
+```
+
+## Отключение и удаление
+
+Временно **отключить** (расширение остаётся установленным, настройки сохраняются):
+
+```sh
+gnome-extensions disable sing-box-status@git.vakhrushev.me
+```
+
+Снова **включить**:
+
+```sh
+gnome-extensions enable sing-box-status@git.vakhrushev.me
+```
+
+Отключать и включать можно и через GUI — приложение **Extensions** («Расширения»)
+или **Extension Manager**.
+
+Полностью **удалить**:
+
+```sh
+UUID="sing-box-status@git.vakhrushev.me"
+gnome-extensions disable "$UUID"
+rm "$HOME/.local/share/gnome-shell/extensions/$UUID"   # симлинк (или каталог при копировании)
+dconf reset -f /org/gnome/shell/extensions/sing-box-status/   # необязательно: сбросить настройки
+```
+
+На Wayland индикатор из панели исчезнет после перелогина.
+
 ## Как это работает
 
 Каждые *N* секунд (по умолчанию 2) расширение опрашивает две точки Clash API:
@@ -71,14 +147,28 @@ gnome-extensions enable "$UUID"
 показываются только те, что sing-box измерил сам. Ручной замер (пункт **Test latency**)
 выполняется через `GET /proxies/{name}/delay` только по нажатию.
 
+**Проверка связности (опция).** Если включить `check-connectivity` в настройках,
+расширение раз в `connectivity-interval` секунд (по умолчанию 30) делает
+`GET /proxies/{активный-узел}/delay` по адресу `connectivity-url`
+(по умолчанию `https://www.gstatic.com/generate_204`). Успех → кружок залит и в меню
+показывается задержка (`Active · N ms`); ошибка/таймаут → сплошное кольцо и
+`No connectivity`. Это единственный режим, когда расширение шлёт трафик в фоне; по
+умолчанию он выключен.
+
 Сетевой слой (авторизация, разбор ответов, переключение outbound) проверен на живом
 API sing-box 1.13.13.
 
 ## Файлы
 
 - `extension.js` — точка входа, добавляет кнопку в панель.
+- `metadata.json` — метаданные расширения (UUID, версии GNOME Shell).
 - `lib/indicator.js` — виджет панели, меню, цикл опроса, отрисовка.
 - `lib/clashApi.js` — асинхронный клиент Clash API на libsoup 3.
 - `lib/format.js` — форматирование байтов и скорости.
 - `prefs.js` — настройки на Adwaita.
+- `stylesheet.css` — стили индикатора и меню.
 - `schemas/` — схема GSettings.
+
+## Лицензия
+
+MIT — см. [LICENSE](LICENSE).

lib/clashApi.js

@@ -16,7 +16,9 @@ const textEncoder = new TextEncoder();
 export class ClashApi {
     constructor({ url = 'http://127.0.0.1:9090', secret = '' } = {}) {
         this._session = new Soup.Session();
-        this._session.timeout = 5;
+        // Above the 5 s /delay probe budget so libsoup's inactivity timeout
+        // doesn't abort a slow-but-alive latency measurement client-side.
+        this._session.timeout = 10;
         this.setEndpoint(url, secret);
     }
 
@@ -25,8 +27,16 @@ export class ClashApi {
         this._secret = secret || '';
     }
 
+    // Abort all in-flight requests and drop idle keep-alive connections.
+    destroy() {
+        this._session.abort();
+    }
+
     _message(method, path, body) {
-        const msg = Soup.Message.new(method, `${this._baseUrl}${path}`);
+        const uri = `${this._baseUrl}${path}`;
+        const msg = Soup.Message.new(method, uri);
+        if (!msg)
+            throw new Error(`Invalid API URL: ${uri}`);
         const headers = msg.get_request_headers();
         headers.append('Accept', 'application/json');
         if (this._secret)

lib/format.js

@@ -21,8 +21,15 @@ export function formatBytes(n) {
 }
 
 // Compact for the panel: "2.4M", "120K", "0".
+// Keeps the mantissa under three integer digits so a value is at most four
+// characters wide ("999K", "9.9M", "1023") — the panel field has a fixed width
+// and must never overflow it (see .sbx-speed-label in stylesheet.css).
 export function formatBytesShort(n) {
-    const [v, i] = scale(n);
+    let [v, i] = scale(n);
+    if (i > 0 && v >= 1000 && i < SHORT_UNITS.length - 1) {
+        v /= 1024;
+        i += 1;
+    }
     if (i === 0)
         return `${Math.round(v)}`;
     const digits = v < 10 ? 1 : 0;

lib/indicator.js

@@ -14,22 +14,20 @@ import { gettext as _ } from 'resource:///org/gnome/shell/extensions/extension.j
 import { ClashApi } from './clashApi.js';
 import { formatSpeed, formatSpeedShort } from './format.js';
 
-const STATE = {
-    CONNECTING: 'connecting',
-    ONLINE: 'online',
-    OFFLINE: 'offline',
-};
-
 export const SingBoxIndicator = GObject.registerClass(
 class SingBoxIndicator extends PanelMenu.Button {
     _init(extension) {
-        super._init(0.0, 'sing-box Status', false);
+        super._init(0.5, 'sing-box Status', false);
 
         this._extension = extension;
         this._settings = extension.getSettings();
         this._api = new ClashApi();
 
-        this._state = STATE.CONNECTING;
+        this._apiUp = null;          // null = connecting, true/false = reachable
+        this._connectivity = 'unknown'; // 'unknown' | 'ok' | 'down'
+        this._connectivityDelay = null; // ms of last successful outbound ping
+        this._activeOutbound = null; // node to probe for connectivity
+        this._dotState = 'connecting'; // 'connecting'|'down'|'nocon'|'ok'
         this._prevSample = null;     // { down, up, t } for speed diffing
         this._selectorSignature = null;
         this._selectorItems = new Map();
@@ -37,7 +35,11 @@ class SingBoxIndicator extends PanelMenu.Button {
         this._delays = new Map();    // node name -> ms number | 'timeout'
         this._probing = new Set();   // nodes with a latency probe in flight
         this._apiUrl = '';
+        this._apiSecret = '';
         this._polling = false;
+        this._pollAgain = false;     // a refresh arrived while polling
+        this._pinging = false;       // connectivity probe in flight
+        this._settingsDebounceId = 0;
         this._cancellable = new Gio.Cancellable();
 
         this._buildPanel();
@@ -47,6 +49,7 @@ class SingBoxIndicator extends PanelMenu.Button {
         this._applySettings();
 
         this._startPolling();
+        this._startConnectivityCheck();
     }
 
     // ---- Panel widget -------------------------------------------------
@@ -57,9 +60,11 @@ class SingBoxIndicator extends PanelMenu.Button {
             y_align: Clutter.ActorAlign.CENTER,
         });
 
-        // Monochrome status dot: a ring in the panel's text color, filled when
+        // Monochrome status dot in the panel's text color (adapts to theme):
-        // the proxy is alive, hollow when it is not. Adapts to light/dark theme.
+        //   filled bright disc — service up and outbound has connectivity;
-        this._dotFilled = false;
+        //   filled dim disc    — service up, connectivity not yet measured;
+        //   bright ring        — service up but no connectivity through the outbound;
+        //   dashed dim ring    — service (Clash API) unreachable / connecting.
         this._dot = new St.DrawingArea({
             style_class: 'sbx-dot',
             y_align: Clutter.ActorAlign.CENTER,
@@ -132,25 +137,54 @@ class SingBoxIndicator extends PanelMenu.Button {
 
     // ---- Settings -----------------------------------------------------
 
+    // Debounce: prefs entry rows emit "changed" per keystroke, and a multi-key
+    // reset fires once per key — collapse the burst into a single apply.
     _onSettingsChanged() {
+        if (this._settingsDebounceId)
+            GLib.Source.remove(this._settingsDebounceId);
+        this._settingsDebounceId = GLib.timeout_add(GLib.PRIORITY_DEFAULT, 300, () => {
+            this._settingsDebounceId = 0;
+            this._reconfigure();
+            return GLib.SOURCE_REMOVE;
+        });
+    }
+
+    _reconfigure() {
         // Latencies measured against one instance are meaningless for another.
-        if (this._settings.get_string('api-url') !== this._apiUrl)
+        // If the endpoint (URL or secret) changed, drop cached latencies and
+        // rotate the cancellable so stale old-endpoint responses are discarded.
+        const urlChanged = this._settings.get_string('api-url') !== this._apiUrl;
+        const secretChanged = this._settings.get_string('api-secret') !== this._apiSecret;
+        if (urlChanged || secretChanged) {
             this._delays.clear();
+            this._cancellable.cancel();
+            this._cancellable = new Gio.Cancellable();
+        }
         this._applySettings();
         this._restartPolling();
+        this._restartConnectivityCheck();
+        if (!this._checkConnectivity) {
+            this._connectivity = 'unknown';
+            this._connectivityDelay = null;
+        }
         this._poll();
+        this._updateStatus();
     }
 
     _applySettings() {
         this._apiUrl = this._settings.get_string('api-url');
+        this._apiSecret = this._settings.get_string('api-secret');
         this._api.setEndpoint(
             this._apiUrl,
-            this._settings.get_string('api-secret')
+            this._apiSecret
         );
         this._interval = this._settings.get_int('refresh-interval');
         this._showOutbound = this._settings.get_boolean('show-outbound');
         this._showSpeed = this._settings.get_boolean('show-speed');
         this._selectorPref = this._settings.get_string('selector-group');
+        this._checkConnectivity = this._settings.get_boolean('check-connectivity');
+        this._connectivityInterval = this._settings.get_int('connectivity-interval');
+        this._connectivityUrl = this._settings.get_string('connectivity-url');
         this._outboundLabel.visible = this._showOutbound;
         this._speedLabel.visible = this._showSpeed;
     }
@@ -185,25 +219,127 @@ class SingBoxIndicator extends PanelMenu.Button {
     }
 
     async _poll() {
-        if (this._polling)
+        if (this._polling) {
+            this._pollAgain = true;
             return;
+        }
         this._polling = true;
         const c = this._cancellable;
         try {
-            const [conn, proxies] = await Promise.all([
+            let conn, proxies;
-                this._api.getConnections(c),
+            try {
-                this._api.getProxies(c),
+                [conn, proxies] = await Promise.all([
-            ]);
+                    this._api.getConnections(c),
+                    this._api.getProxies(c),
+                ]);
+            } catch (e) {
+                if (c.is_cancelled())
+                    return;
+                // Service (Clash API) unreachable: connectivity is moot.
+                this._apiUp = false;
+                this._connectivity = 'unknown';
+                this._connectivityDelay = null;
+                this._prevSample = null;
+                this._clearMenuData();
+                this._updateStatus();
+                return;
+            }
             if (c.is_cancelled())
                 return;
-            this._updateFromData(conn, proxies);
+            this._apiUp = true;
-            this._setState(STATE.ONLINE);
+            // Note: _updateFromData is UI code — keep it out of the API try so
-        } catch (e) {
+            // a rendering bug isn't misreported as "API unreachable". A render
-            if (c.is_cancelled())
+            // failure is logged but must not skip status/connectivity handling.
-                return;
+            try {
-            this._setState(STATE.OFFLINE, e);
+                this._updateFromData(conn, proxies);
+            } catch (e) {
+                logError(e, 'sing-box-status: render failed');
+            }
+            this._updateStatus();
+            // Resolve unknown connectivity promptly (startup, recovery, switch).
+            if (this._checkConnectivity && this._connectivity === 'unknown')
+                this._pingConnectivity();
         } finally {
             this._polling = false;
+            // A refresh arrived mid-poll and was swallowed by the guard: run it.
+            if (this._pollAgain) {
+                this._pollAgain = false;
+                this._poll();
+            }
+        }
+    }
+
+    // ---- Connectivity check (optional active probe) -------------------
+
+    _startConnectivityCheck() {
+        if (!this._checkConnectivity)
+            return;
+        this._connectivityTimeoutId = GLib.timeout_add_seconds(
+            GLib.PRIORITY_DEFAULT,
+            Math.max(5, this._connectivityInterval),
+            () => {
+                this._pingConnectivity();
+                return GLib.SOURCE_CONTINUE;
+            }
+        );
+        this._pingConnectivity();
+    }
+
+    _stopConnectivityCheck() {
+        if (this._connectivityTimeoutId) {
+            GLib.Source.remove(this._connectivityTimeoutId);
+            this._connectivityTimeoutId = 0;
+        }
+    }
+
+    _restartConnectivityCheck() {
+        this._stopConnectivityCheck();
+        this._startConnectivityCheck();
+    }
+
+    // Probe the active outbound to tell "up but no internet" from "up and OK".
+    async _pingConnectivity() {
+        if (!this._checkConnectivity || this._apiUp === false || this._pinging)
+            return;
+        const node = this._activeOutbound;
+        if (!node)
+            return;
+        this._pinging = true;
+        const c = this._cancellable;
+        try {
+            const res = await this._api.getDelay(
+                node, { url: this._connectivityUrl || undefined, timeout: 5000 }, c);
+            // Discard if cancelled or the active outbound changed mid-flight.
+            if (c.is_cancelled() || node !== this._activeOutbound)
+                return;
+            const d = Number(res?.delay);
+            if (Number.isFinite(d) && d > 0) {
+                this._connectivity = 'ok';
+                this._connectivityDelay = d;
+                this._delays.set(node, d);
+            } else {
+                this._connectivity = 'down';
+                this._connectivityDelay = null;
+                this._delays.set(node, 'timeout');
+            }
+            this._updateStatus();
+        } catch (e) {
+            if (c.is_cancelled() || node !== this._activeOutbound)
+                return;
+            // An HTTP error is a real outbound-failure verdict; a transport/API
+            // error (unreachable, aborted) is not — don't record it as a timeout.
+            const httpFail = typeof e?.message === 'string' && e.message.startsWith('HTTP');
+            if (httpFail) {
+                this._connectivity = 'down';
+                this._connectivityDelay = null;
+                this._delays.set(node, 'timeout');
+            } else {
+                this._connectivity = 'unknown';
+                this._connectivityDelay = null;
+            }
+            this._updateStatus();
+        } finally {
+            this._pinging = false;
         }
     }
 
@@ -276,33 +412,51 @@ class SingBoxIndicator extends PanelMenu.Button {
     _updateSelectors(proxies) {
         const map = proxies?.proxies ?? {};
         this._proxiesMap = map;
-        const selectors = [];
+
+        // Outbound groups the extension understands. Selector is switchable
+        // (PUT); URLTest/Fallback are shown read-only (sing-box picks the node).
+        const groups = [];
         for (const name of Object.keys(map)) {
             const p = map[name];
-            if (p && p.type === 'Selector' && Array.isArray(p.all))
+            if (!p || !Array.isArray(p.all))
-                selectors.push({ name, now: p.now, all: p.all });
+                continue;
+            if (p.type === 'Selector')
+                groups.push({ name, now: p.now, all: p.all, type: p.type, switchable: true });
+            else if (p.type === 'URLTest' || p.type === 'Fallback')
+                groups.push({ name, now: p.now, all: p.all, type: p.type, switchable: false });
         }
 
-        // Panel outbound label: chosen group's current node.
+        // Switchable (Selector) groups first; sort is stable within each class.
-        const panelGroup = this._pickPanelGroup(selectors);
+        groups.sort((a, b) => (b.switchable ? 1 : 0) - (a.switchable ? 1 : 0));
-        this._outboundLabel.text = panelGroup ? panelGroup.now ?? '' : '';
 
-        // Rebuild the selector section only when the structure changes.
+        // Panel outbound label: chosen group's current node.
-        const signature = JSON.stringify(selectors.map(s => [s.name, s.all]));
+        const panelGroup = this._pickPanelGroup(groups);
+        this._outboundLabel.text = panelGroup ? panelGroup.now ?? '' : '';
+        const newActive = panelGroup ? panelGroup.now ?? null : null;
+        // If the active outbound changed outside _selectOutbound (e.g. a
+        // URLTest re-pick or an external switch), the last connectivity verdict
+        // is stale — reset it so the poll-side re-ping re-probes the new node.
+        if (newActive !== this._activeOutbound && this._checkConnectivity && newActive) {
+            this._connectivity = 'unknown';
+            this._connectivityDelay = null;
+        }
+        this._activeOutbound = newActive;
+
+        // Rebuild the group section only when the structure changes.
+        const signature = JSON.stringify(groups.map(g => [g.name, g.all, g.switchable]));
         if (signature !== this._selectorSignature) {
-            this._rebuildSelectors(selectors);
+            this._rebuildSelectors(groups);
             this._selectorSignature = signature;
         }
 
         // Update current selection + latencies every poll.
-        for (const sel of selectors) {
+        for (const g of groups) {
-            const stored = this._selectorItems.get(sel.name);
+            const stored = this._selectorItems.get(g.name);
             if (!stored)
                 continue;
-            stored.subMenu.label.text = `${sel.name}: ${sel.now ?? '—'}`;
+            stored.subMenu.label.text = this._groupTitle(g);
             for (const [member, entry] of stored.members) {
-                const isCurrent = member === sel.now;
+                entry.setOrnament(member === g.now
-                entry.setOrnament(isCurrent
                     ? PopupMenu.Ornament.DOT
                     : PopupMenu.Ornament.NONE);
                 // Don't overwrite the "…" placeholder while a probe is running.
@@ -313,12 +467,12 @@ class SingBoxIndicator extends PanelMenu.Button {
         }
     }
 
-    _rebuildSelectors(selectors) {
+    _rebuildSelectors(groups) {
         this._selectorsSection.removeAll();
         this._selectorItems.clear();
 
-        if (selectors.length === 0) {
+        if (groups.length === 0) {
-            const none = new PopupMenu.PopupMenuItem(_('No selector groups'), {
+            const none = new PopupMenu.PopupMenuItem(_('No outbound groups'), {
                 reactive: false,
                 can_focus: false,
             });
@@ -326,26 +480,31 @@ class SingBoxIndicator extends PanelMenu.Button {
             return;
         }
 
-        for (const sel of selectors) {
+        for (const g of groups) {
-            const subMenu = new PopupMenu.PopupSubMenuMenuItem(`${sel.name}: ${sel.now ?? '—'}`, true);
+            const subMenu = new PopupMenu.PopupSubMenuMenuItem(this._groupTitle(g), true);
             subMenu.icon.icon_name = 'network-workgroup-symbolic';
 
             // Manual latency probe for all nodes in this group. Override
             // activate() so clicking it runs the probe without closing the menu.
             const testItem = new PopupMenu.PopupImageMenuItem(_('Test latency'), 'view-refresh-symbolic');
             testItem.add_style_class_name('sbx-test-item');
-            testItem.activate = () => this._testLatencies(sel.name);
+            testItem.activate = () => this._testLatencies(g.name);
             subMenu.menu.addMenuItem(testItem);
 
             const members = new Map();
-            for (const member of sel.all) {
+            for (const member of g.all) {
-                const item = new PopupMenu.PopupMenuItem(member);
+                // Switchable groups: click a node to select it. Read-only groups
-                item.connect('activate', () => this._selectOutbound(sel.name, member));
+                // (URLTest/Fallback): show nodes but don't try to PUT-switch.
+                const item = g.switchable
+                    ? new PopupMenu.PopupMenuItem(member)
+                    : new PopupMenu.PopupMenuItem(member, { reactive: false, can_focus: false });
+                if (g.switchable)
+                    item.connect('activate', () => this._selectOutbound(g.name, member));
                 subMenu.menu.addMenuItem(item);
                 members.set(member, item);
             }
             this._selectorsSection.addMenuItem(subMenu);
-            this._selectorItems.set(sel.name, { subMenu, members });
+            this._selectorItems.set(g.name, { subMenu, members });
         }
     }
 
@@ -359,15 +518,23 @@ class SingBoxIndicator extends PanelMenu.Button {
         this._connItem.label.text = `${_('Connections')}: —`;
     }
 
-    _pickPanelGroup(selectors) {
+    // Submenu title: read-only groups also show their type (URLTest/Fallback).
-        if (selectors.length === 0)
+    _groupTitle(g) {
+        return g.switchable
+            ? `${g.name}: ${g.now ?? '—'}`
+            : `${g.name} [${g.type}]: ${g.now ?? '—'}`;
+    }
+
+    _pickPanelGroup(groups) {
+        if (groups.length === 0)
             return null;
         if (this._selectorPref) {
-            const match = selectors.find(s => s.name === this._selectorPref);
+            const match = groups.find(g => g.name === this._selectorPref);
             if (match)
                 return match;
         }
-        return selectors[0];
+        // Default to a switchable (Selector) group; else the first group.
+        return groups.find(g => g.switchable) ?? groups[0];
     }
 
     // Latest known latency: a manual probe result wins over sing-box's own
@@ -403,9 +570,12 @@ class SingBoxIndicator extends PanelMenu.Button {
         if (!stored)
             return;
         for (const [member, item] of stored.members) {
+            // Skip nodes already being probed (manual re-click or overlap).
+            if (this._probing.has(member))
+                continue;
             this._probing.add(member);
             item.label.text = `${member}  ·  …`;
-            this._api.getDelay(member, {}, this._cancellable)
+            this._api.getDelay(member, { url: this._connectivityUrl || undefined }, this._cancellable)
                 .then(res => {
                     const d = Number(res?.delay);
                     this._delays.set(member, Number.isFinite(d) && d > 0 ? d : 'timeout');
@@ -429,8 +599,18 @@ class SingBoxIndicator extends PanelMenu.Button {
     async _selectOutbound(group, name) {
         try {
             await this._api.selectProxy(group, name, this._cancellable);
+            if (this._cancellable.is_cancelled())
+                return;
+            // The outbound changed: the last connectivity verdict is stale.
+            // Reset it; the poll below refreshes the active node and re-probes.
+            if (this._checkConnectivity) {
+                this._connectivity = 'unknown';
+                this._connectivityDelay = null;
+            }
             this._poll();
         } catch (e) {
+            if (this._cancellable.is_cancelled())
+                return;
             Main.notifyError(_('sing-box'), `${_('Failed to switch outbound')}: ${e.message}`);
             logError(e, 'sing-box-status: selectProxy failed');
         }
@@ -438,56 +618,84 @@ class SingBoxIndicator extends PanelMenu.Button {
 
     // ---- State / visuals ---------------------------------------------
 
-    _setState(state, error) {
+    // Derive the dot state and status text from API + connectivity state.
-        this._state = state;
+    _updateStatus() {
-
+        let dot;
-        switch (state) {
+        if (this._apiUp === null) {
-        case STATE.ONLINE:
+            dot = 'connecting';
-            this._dotFilled = true;
+            this._statusItem.label.text = _('sing-box  ·  Connecting…');
-            this._statusItem.label.text = _('sing-box  ·  Active');
+        } else if (!this._apiUp) {
-            break;
+            dot = 'down';
-        case STATE.OFFLINE:
-            this._dotFilled = false;
             this._statusItem.label.text = _('sing-box  ·  Unreachable');
             this._outboundLabel.text = '';
             this._speedLabel.text = '';
             this._speedItem.label.text = _('API unreachable — check URL and secret in Settings');
-            this._prevSample = null;
+        } else if (this._checkConnectivity && this._activeOutbound && this._connectivity === 'unknown') {
-            this._clearMenuData();
+            // Service up, connectivity not measured yet — don't claim it works.
-            break;
+            dot = 'checking';
-        default:
+            this._statusItem.label.text = _('sing-box  ·  Active (checking…)');
-            this._dotFilled = false;
+        } else if (this._checkConnectivity && this._connectivity === 'down') {
-            this._statusItem.label.text = _('sing-box  ·  Connecting…');
+            dot = 'nocon';
-            break;
+            this._statusItem.label.text = _('sing-box  ·  No connectivity');
+        } else {
+            dot = 'ok';
+            const ms = this._checkConnectivity && this._connectivityDelay
+                ? `  ·  ${this._connectivityDelay} ms` : '';
+            this._statusItem.label.text = `${_('sing-box  ·  Active')}${ms}`;
+        }
+
+        if (dot !== this._dotState) {
+            this._dotState = dot;
+            this._dot.queue_repaint();
         }
-        this._dot.queue_repaint();
     }
 
     _drawDot(area) {
         const cr = area.get_context();
-        const [w, h] = area.get_surface_size();
+        try {
-        const color = area.get_theme_node().get_foreground_color();
+            const [w, h] = area.get_surface_size();
-        const r = color.red / 255;
+            const color = area.get_theme_node().get_foreground_color();
-        const g = color.green / 255;
+            const r = color.red / 255;
-        const b = color.blue / 255;
+            const g = color.green / 255;
-        const a = color.alpha / 255;
+            const b = color.blue / 255;
+            const a = color.alpha / 255;
 
-        const cx = w / 2;
+            const cx = w / 2;
-        const cy = h / 2;
+            const cy = h / 2;
-        const radius = Math.min(w, h) / 2 - 2;
+            const radius = Math.min(w, h) / 2 - 2;
 
-        cr.setLineWidth(1.5);
+            cr.setLineWidth(1.5);
-        cr.arc(cx, cy, radius, 0, 2 * Math.PI);
+            cr.arc(cx, cy, radius, 0, 2 * Math.PI);
-        if (this._dotFilled) {
+
-            cr.setSourceRGBA(r, g, b, a);
+            switch (this._dotState) {
-            cr.fillPreserve();
+            case 'ok':
-            cr.stroke();
+                // Filled disc: service up and outbound reachable.
-        } else {
+                cr.setSourceRGBA(r, g, b, a);
-            // Hollow ring, slightly dimmed so "off" reads as inactive.
+                cr.fillPreserve();
-            cr.setSourceRGBA(r, g, b, a * 0.6);
+                cr.stroke();
-            cr.stroke();
+                break;
+            case 'nocon':
+                // Bright solid ring: service up but no connectivity.
+                cr.setSourceRGBA(r, g, b, a);
+                cr.stroke();
+                break;
+            case 'checking':
+                // Dim filled disc: service up, connectivity not measured yet.
+                cr.setSourceRGBA(r, g, b, a * 0.5);
+                cr.fillPreserve();
+                cr.stroke();
+                break;
+            default:
+                // Dashed dim ring: service unreachable ('down') or connecting.
+                cr.setDash([2, 2], 0);
+                cr.setSourceRGBA(r, g, b, a * 0.5);
+                cr.stroke();
+                cr.setDash([], 0);
+                break;
+            }
+        } finally {
+            cr.$dispose();
         }
-        cr.$dispose();
     }
 
     _openDashboard() {
@@ -504,10 +712,16 @@ class SingBoxIndicator extends PanelMenu.Button {
             GLib.Source.remove(this._timeoutId);
             this._timeoutId = 0;
         }
+        this._stopConnectivityCheck();
+        if (this._settingsDebounceId) {
+            GLib.Source.remove(this._settingsDebounceId);
+            this._settingsDebounceId = 0;
+        }
         if (this._settingsChangedId) {
             this._settings.disconnect(this._settingsChangedId);
             this._settingsChangedId = 0;
         }
+        this._api.destroy();
         super.destroy();
     }
 });

prefs.js

@@ -37,7 +37,7 @@ export default class SingBoxStatusPreferences extends ExtensionPreferences {
         dispGroup.add(this._switchRow(settings, 'show-speed', _('Show speed'),
             _('Show upload/download speed in the top bar.')));
         dispGroup.add(this._entryRow(settings, 'selector-group', _('Panel selector group'),
-            _('Selector group shown in the panel. Empty = first one found.')));
+            _('Group shown in the panel; a URLTest/Fallback name is also accepted. Empty = first switchable (Selector) group, otherwise the first group.')));
 
         const intervalRow = new Adw.SpinRow({
             title: _('Refresh interval'),
@@ -46,6 +46,31 @@ export default class SingBoxStatusPreferences extends ExtensionPreferences {
         });
         settings.bind('refresh-interval', intervalRow, 'value', Gio.SettingsBindFlags.DEFAULT);
         dispGroup.add(intervalRow);
+
+        // --- Connectivity ---------------------------------------------
+        const connCheckGroup = new Adw.PreferencesGroup({
+            title: _('Connectivity check'),
+            description: _('Actively probe the active outbound to tell “up but no internet” from “up and reachable”. Adds connectivity-based status-dot states (four in total).'),
+        });
+        page.add(connCheckGroup);
+
+        const checkRow = this._switchRow(settings, 'check-connectivity',
+            _('Probe active outbound'),
+            _('Periodically sends a background request through the current outbound to the Probe URL below (an external site by default). Off = no background traffic.'));
+        connCheckGroup.add(checkRow);
+
+        const connIntervalRow = new Adw.SpinRow({
+            title: _('Probe interval'),
+            subtitle: _('Seconds between outbound probes.'),
+            adjustment: new Gtk.Adjustment({ lower: 5, upper: 600, step_increment: 5 }),
+        });
+        settings.bind('connectivity-interval', connIntervalRow, 'value', Gio.SettingsBindFlags.DEFAULT);
+        settings.bind('check-connectivity', connIntervalRow, 'sensitive', Gio.SettingsBindFlags.GET);
+        connCheckGroup.add(connIntervalRow);
+
+        const connUrlRow = this._entryRow(settings, 'connectivity-url', _('Probe / test URL'),
+            _('Used by both the connectivity check and the manual Test latency action.'));
+        connCheckGroup.add(connUrlRow);
     }
 
     _entryRow(settings, key, title, subtitle) {

schemas/org.gnome.shell.extensions.sing-box-status.gschema.xml

@@ -26,7 +26,7 @@
     <key name="selector-group" type="s">
       <default>''</default>
       <summary>Outbound selector group shown in the panel</summary>
-      <description>Name of the Selector group whose current node is shown in the top bar. Empty means auto-detect the first Selector.</description>
+      <description>Name of the group whose current node is shown in the top bar. Accepts any group name (Selector, URLTest or Fallback). Empty means auto-pick the first switchable (Selector) group, or the first group if none is switchable.</description>
     </key>
     <key name="show-outbound" type="b">
       <default>true</default>
@@ -38,5 +38,21 @@
       <summary>Show speed in the panel</summary>
       <description>Show upload/download speed in the top bar.</description>
     </key>
+    <key name="check-connectivity" type="b">
+      <default>false</default>
+      <summary>Periodically probe the active outbound</summary>
+      <description>When enabled, the extension periodically measures latency through the active outbound to distinguish "service up but no connectivity" from "service up and reachable".</description>
+    </key>
+    <key name="connectivity-interval" type="i">
+      <default>30</default>
+      <range min="5" max="600"/>
+      <summary>Connectivity probe interval (seconds)</summary>
+      <description>How often to probe the active outbound when connectivity checking is enabled.</description>
+    </key>
+    <key name="connectivity-url" type="s">
+      <default>'https://www.gstatic.com/generate_204'</default>
+      <summary>Connectivity probe URL</summary>
+      <description>Target URL used both by the active-outbound connectivity probe and by the manual "Test latency" action.</description>
+    </key>
   </schema>
 </schemalist>

stylesheet.css

@@ -15,6 +15,10 @@
 .sbx-speed-label {
     font-feature-settings: "tnum";
     font-size: 0.9em;
+    /* Fixed width so the panel widget doesn't shift as speed values change.
+       Sized for the widest field: "↓1023 ↑1023" (see formatBytesShort). */
+    min-width: 7.5em;
+    text-align: left;
 }
 
 .sbx-status-item {