UaLens — multi-tab Avalonia desktop client for OPC UA

.azurepipelines/preview.yml

@@ -98,7 +98,7 @@ jobs:
         dir /b /s Stack\Opc.Ua*.dll > .\list.txt
         dir /b /s Tools\Opc.Ua*.dll >> .\list.txt
         dir /b /s Libraries\Opc.Ua*.dll >> .\list.txt
-        dir /b /s Applications\McpServer\bin\Opc.Ua*.dll >> .\list.txt
+        dir /b /s Applications\Opc.Ua.Mcp\bin\Opc.Ua*.dll >> .\list.txt
         dir /b /s .azurepipelines\*.* >> .\list.txt
         type .\list.txt
   - task: CmdLine@2

.azurepipelines/signlistDebug.txt

@@ -96,4 +96,4 @@ Libraries\Opc.Ua.WotCon.Server\bin\Debug\net48\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Debug\net8.0\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Debug\net9.0\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Debug\net10.0\Opc.Ua.WotCon.Server.dll
-Applications\McpServer\bin\Debug\net10.0\Opc.Ua.Mcp.dll
+Applications\Opc.Ua.Mcp\bin\Debug\net10.0\Opc.Ua.Mcp.dll

.azurepipelines/signlistRelease.txt

@@ -96,4 +96,4 @@ Libraries\Opc.Ua.WotCon.Server\bin\Release\net48\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Release\net8.0\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Release\net9.0\Opc.Ua.WotCon.Server.dll
 Libraries\Opc.Ua.WotCon.Server\bin\Release\net10.0\Opc.Ua.WotCon.Server.dll
-Applications\McpServer\bin\Release\net10.0\Opc.Ua.Mcp.dll
+Applications\Opc.Ua.Mcp\bin\Release\net10.0\Opc.Ua.Mcp.dll

.github/agents/opcua-interop-tester.agent.md

@@ -9,7 +9,7 @@ You are an expert OPC UA interoperability test engineer. Your role is to systema
 
 ## MCP Tools — Primary Test Method
 
-This repository includes an **OPC UA MCP Server** (`Applications/McpServer`) that exposes all OPC UA Part 4 services as MCP tools. **Always prefer using the MCP tools over writing custom C# test code** — they are faster, require no compilation, and cover all standard services.
+This repository includes an **OPC UA MCP Server** (`Applications/Opc.Ua.Mcp`) that exposes all OPC UA Part 4 services as MCP tools. **Always prefer using the MCP tools over writing custom C# test code** — they are faster, require no compilation, and cover all standard services.
 
 ### When to Use MCP Tools
 - **Always** for initial connection, browsing, reading, writing, method calling, subscription testing

Applications/ConsoleReferenceServer/Program.cs

@@ -144,7 +144,16 @@ public static Task<int> Main(string[] args)
                     var sw = Stopwatch.StartNew();
 
                     // create the UA server
-                    var server = new UAServer<ReferenceServer>(telemetry, t => new ReferenceServer(t))
+                    var server = new UAServer<ReferenceServer>(
+                        telemetry,
+                        // The console reference server is the canonical
+                        // host that exposes the full address space — turn
+                        // FileSystem (Part 20) on by default so clients
+                        // can browse Server.FileSystem without extra
+                        // configuration. Unit-test fixtures construct
+                        // ReferenceServer directly and keep the property
+                        // at its default false.
+                        t => new ReferenceServer(t) { EnableFileSystemNodeManager = true })
                     {
                         AutoAccept = autoAccept,
                         Password = password

Applications/ConsoleReferenceServer/Quickstarts.ReferenceServer.Config.xml

@@ -263,19 +263,24 @@
     <MaxQueryContinuationPoints>10</MaxQueryContinuationPoints>
     <MaxHistoryContinuationPoints>100</MaxHistoryContinuationPoints>
     <MaxRequestAge>600000</MaxRequestAge>
-    <MinPublishingInterval>50</MinPublishingInterval>
+    <MinPublishingInterval>1</MinPublishingInterval>
     <MaxPublishingInterval>3600000</MaxPublishingInterval>
-    <PublishingResolution>50</PublishingResolution>
+    <PublishingResolution>1</PublishingResolution>
     <MaxSubscriptionLifetime>3600000</MaxSubscriptionLifetime>
     <MaxMessageQueueSize>100</MaxMessageQueueSize>
     <MaxNotificationQueueSize>100</MaxNotificationQueueSize>
     <MaxNotificationsPerPublish>1000</MaxNotificationsPerPublish>
     <MinMetadataSamplingInterval>1000</MinMetadataSamplingInterval>
     <AvailableSamplingRates>
       <SamplingRateGroup>
-        <Start>5</Start>
-        <Increment>5</Increment>
-        <Count>20</Count>
+        <Start>1</Start>
+        <Increment>1</Increment>
+        <Count>10</Count>
+      </SamplingRateGroup>
+      <SamplingRateGroup>
+        <Start>10</Start>
+        <Increment>10</Increment>
+        <Count>9</Count>
       </SamplingRateGroup>
       <SamplingRateGroup>
         <Start>100</Start>

Applications/Opc.Ua.Lens/AdapterRaceProbe.cs

@@ -0,0 +1,140 @@
+/* ========================================================================
+ * Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
+ *
+ * OPC Foundation MIT License 1.00
+ *
+ * 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.
+ *
+ * The complete license agreement can be found here:
+ * http://opcfoundation.org/License/MIT/1.00/
+ * ======================================================================*/
+
+using System;
+using System.Diagnostics;
+using System.Diagnostics.Metrics;
+using System.Linq;
+using System.Threading;
+using System.Threading.Tasks;
+using Microsoft.Extensions.Logging;
+using Microsoft.Extensions.Logging.Abstractions;
+using Opc.Ua;
+using UaLens.Connection;
+using UaLens.Subscriptions;
+
+namespace UaLens;
+
+/// <summary>
+/// Adapter-lifecycle race stress test: spawns many tasks that create +
+/// forget adapters concurrently with a disconnect.  Asserts that
+/// <see cref="ConnectionService.ForgetAdapter"/>'s new bool return value
+/// correctly differentiates "you own disposal" vs "Disconnect already
+/// owned it" so no zombies leak through either path.
+/// </summary>
+internal static class AdapterRaceProbe
+{
+    public static async Task<int> RunAsync(string endpointUrl, CancellationToken ct = default)
+    {
+        var telemetry = new ConsoleTelemetry();
+        Console.WriteLine("== AdapterRace probe ==");
+        Console.WriteLine($"   endpoint: {endpointUrl}");
+
+        var conn = new ConnectionService(telemetry);
+        await using (conn.ConfigureAwait(false))
+        {
+            await conn.ConnectAsync(new ConnectionOptions
+            {
+                EndpointUrl = endpointUrl,
+                Engine = SubscriptionEngineKind.ChannelV2
+            }, ct).ConfigureAwait(false);
+
+            const int N = 24;
+            var adapters = new ISubscriptionAdapter[N];
+            for (int i = 0; i < N; i++)
+            {
+                adapters[i] = conn.CreateAdapter();
+            }
+
+            // Pre-disconnect: each adapter should be forget-able exactly once.
+            int forgottenCount = 0;
+            for (int i = 0; i < N / 2; i++)
+            {
+                if (conn.ForgetAdapter(adapters[i]))
+                {
+                    forgottenCount++;
+                    await adapters[i].DisposeAsync().ConfigureAwait(false);
+                }
+            }
+            if (forgottenCount != N / 2)
+            {
+                Console.WriteLine($"FAIL: expected {N / 2} ForgetAdapter=true, got {forgottenCount}");
+                return 1;
+            }
+
+            // Disconnect — should dispose the remaining N/2 adapters that are
+            // still tracked; ForgetAdapter for any of those AFTER disconnect
+            // must return false (already disposed).
+            Task disconnectTask = conn.DisconnectAsync();
+
+            // Race: try ForgetAdapter on the not-yet-forgotten adapters
+            // concurrently with the disconnect.  Outcome must be EITHER:
+            //   - ForgetAdapter returns true → caller disposes (no double dispose).
+            //   - ForgetAdapter returns false → DisconnectInternalAsync is/was disposing.
+            int doubleDisposalAttempts = 0;
+            var forgotAfter = new bool[N];
+            Parallel.For(N / 2, N, i =>
+            {
+                forgotAfter[i] = conn.ForgetAdapter(adapters[i]);
+                if (forgotAfter[i])
+                {
+                    try
+                    {
+                        adapters[i].DisposeAsync().AsTask().Wait();
+                    }
+                    catch (Exception)
+                    {
+                        Interlocked.Increment(ref doubleDisposalAttempts);
+                    }
+                }
+            });
+
+            await disconnectTask.ConfigureAwait(false);
+
+            Console.WriteLine($"  forgot pre-disconnect : {forgottenCount}");
+            Console.WriteLine($"  forgot during disconn : {forgotAfter.Skip(N / 2).Count(b => b)}");
+            Console.WriteLine($"  double-dispose excepts: {doubleDisposalAttempts}");
+
+            if (doubleDisposalAttempts > 0)
+            {
+                Console.WriteLine("FAIL: double-disposal detected.");
+                return 1;
+            }
+            Console.WriteLine("ADAPTER RACE PROBE PASS");
+            return 0;
+        }
+    }
+
+    private sealed class ConsoleTelemetry : ITelemetryContext
+    {
+        public ILoggerFactory LoggerFactory { get; } = NullLoggerFactory.Instance;
+        public Meter CreateMeter() => new("UaLens.AdapterRaceProbe");
+        public ActivitySource ActivitySource { get; } = new("UaLens.AdapterRaceProbe");
+    }
+}

Applications/Opc.Ua.Lens/App.axaml

@@ -0,0 +1,133 @@
+<!-- ========================================================================
+   Copyright (c) 2005-2025 The OPC Foundation, Inc. All rights reserved.
+
+   OPC Foundation MIT License 1.00
+
+   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.
+
+   The complete license agreement can be found here:
+   http://opcfoundation.org/License/MIT/1.00/
+======================================================================== -->
+<Application xmlns="https://github.com/avaloniaui"
+             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+             x:Class="UaLens.App"
+             RequestedThemeVariant="Dark">
+  <Application.Resources>
+    <ResourceInclude x:Key="ThemeDictionary" Source="avares://UaLens/Themes/DarkNavy.axaml" />
+  </Application.Resources>
+  <Application.Styles>
+    <FluentTheme />
+
+    <!-- Toolbar styles (apply to every WrapPanel / StackPanel / Border whose
+         Classes attribute carries "toolbar").  Forces a single 28 px height
+         on every interactive control inside the strip and vertically centres
+         all content + labels so action bars look tidy across plug-ins. -->
+    <Style Selector="WrapPanel.toolbar Button">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="HorizontalContentAlignment" Value="Center"/>
+      <Setter Property="Padding" Value="10,0"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar ToggleButton">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="HorizontalContentAlignment" Value="Center"/>
+      <Setter Property="Padding" Value="10,0"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar ComboBox">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+      <Setter Property="Padding" Value="8,0"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar CheckBox">
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar TextBox">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar TextBlock">
+      <Setter Property="VerticalAlignment" Value="Center"/>
+    </Style>
+    <Style Selector="WrapPanel.toolbar StackPanel">
+      <Setter Property="VerticalAlignment" Value="Center"/>
+    </Style>
+
+    <!-- Same rules for toolbars where the strip is a horizontal StackPanel. -->
+    <Style Selector="StackPanel.toolbar Button">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="HorizontalContentAlignment" Value="Center"/>
+      <Setter Property="Padding" Value="10,0"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="StackPanel.toolbar ToggleButton">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="HorizontalContentAlignment" Value="Center"/>
+      <Setter Property="Padding" Value="10,0"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="StackPanel.toolbar ComboBox">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+      <Setter Property="Padding" Value="8,0"/>
+    </Style>
+    <Style Selector="StackPanel.toolbar CheckBox">
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="StackPanel.toolbar TextBox">
+      <Setter Property="Height" Value="28"/>
+      <Setter Property="MinHeight" Value="28"/>
+      <Setter Property="VerticalAlignment" Value="Center"/>
+      <Setter Property="VerticalContentAlignment" Value="Center"/>
+      <Setter Property="FontSize" Value="12"/>
+    </Style>
+    <Style Selector="StackPanel.toolbar TextBlock">
+      <Setter Property="VerticalAlignment" Value="Center"/>
+    </Style>
+  </Application.Styles>
+</Application>