qs/socket: improve resilience of socket detection and connection

related #2369
port 1.5

(cherry picked from commit 64461c534f)

quickshell/Services/DMSService.qml

@@ -11,7 +11,7 @@ Singleton {
     id: root
     readonly property var log: Log.scoped("DMSService")
 
-    property bool dmsAvailable: false
+    readonly property bool dmsAvailable: isConnected
     property var capabilities: []
     property int apiVersion: 0
     property string cliVersion: ""
@@ -21,7 +21,7 @@ Singleton {
     property var availableThemes: []
     property var installedThemes: []
     property bool isConnected: false
-    property bool isConnecting: false
+    readonly property bool isConnecting: requestSocket.connected && !requestSocket.linkUp
     property bool subscribeConnected: false
 
     readonly property string socketPath: Quickshell.env("DMS_SOCKET")
@@ -72,9 +72,10 @@ Singleton {
     property var activeSubscriptions: ["network", "network.credentials", "loginctl", "freedesktop", "freedesktop.screensaver", "gamma", "theme.auto", "wallpaper", "bluetooth", "bluetooth.pairing", "brightness", "wlroutput", "evdev", "browser", "dbus", "clipboard", "sysupdate"]
 
     Component.onCompleted: {
-        if (socketPath && socketPath.length > 0) {
+        if (!socketPath || socketPath.length === 0)
+            return;
         detectUpdateCommand();
-        }
+        requestSocket.connected = true;
     }
 
     function detectUpdateCommand() {
@@ -82,12 +83,6 @@ Singleton {
         checkAurHelper.running = true;
     }
 
-    function startSocketConnection() {
-        if (socketPath && socketPath.length > 0) {
-            testProcess.running = true;
-        }
-    }
-
     Process {
         id: checkAurHelper
         command: ["sh", "-c", "command -v paru || command -v yay"]
@@ -105,7 +100,6 @@ Singleton {
                 } else {
                     updateCommand = "dms update";
                     checkingUpdateCommand = false;
-                    startSocketConnection();
                 }
             }
         }
@@ -114,7 +108,6 @@ Singleton {
             if (exitCode !== 0) {
                 updateCommand = "dms update";
                 checkingUpdateCommand = false;
-                startSocketConnection();
             }
         }
     }
@@ -135,7 +128,6 @@ Singleton {
                     updateCommand = "dms update";
                 }
                 checkingUpdateCommand = false;
-                startSocketConnection();
             }
         }
 
@@ -143,53 +135,28 @@ Singleton {
             if (exitCode !== 0) {
                 updateCommand = "dms update";
                 checkingUpdateCommand = false;
-                startSocketConnection();
             }
         }
     }
 
-    Process {
-        id: testProcess
-        command: ["test", "-S", root.socketPath]
-
-        onExited: exitCode => {
-            if (exitCode === 0) {
-                root.dmsAvailable = true;
-                connectSocket();
-            } else {
-                root.dmsAvailable = false;
-            }
-        }
-    }
-
-    function connectSocket() {
-        if (!dmsAvailable || isConnected || isConnecting) {
-            return;
-        }
-
-        isConnecting = true;
-        requestSocket.connected = true;
-    }
-
     DankSocket {
         id: requestSocket
         path: root.socketPath
         connected: false
 
         onConnectionStateChanged: {
-            if (connected) {
+            if (linkUp) {
                 root.isConnected = true;
-                root.isConnecting = false;
                 root.connectionStateChanged();
                 subscribeSocket.connected = true;
-            } else {
+                return;
+            }
             root.isConnected = false;
-                root.isConnecting = false;
             root.apiVersion = 0;
             root.capabilities = [];
+            root.failPendingRequests();
             root.connectionStateChanged();
         }
-        }
 
         parser: SplitParser {
             onRead: line => {
@@ -219,11 +186,11 @@ Singleton {
         connected: false
 
         onConnectionStateChanged: {
-            root.subscribeConnected = connected;
+            root.subscribeConnected = linkUp;
-            if (connected) {
+            if (!linkUp)
+                return;
             sendSubscribeRequest();
         }
-        }
 
         parser: SplitParser {
             onRead: line => {
@@ -446,11 +413,21 @@ Singleton {
 
     function handleResponse(response) {
         const callback = pendingRequests[response.id];
-
+        if (!callback)
-        if (callback) {
+            return;
         delete pendingRequests[response.id];
         callback(response);
     }
+
+    function failPendingRequests() {
+        const pending = pendingRequests;
+        pendingRequests = {};
+        clipboardRequestIds = {};
+        for (const id in pending) {
+            pending[id]({
+                "error": "not connected to DMS socket"
+            });
+        }
     }
 
     function ping(callback) {