feat(dotnet): add galaxy-browse CLI (§4.6); chore: verify version subcommand (§4.4)

clients/dotnet/README.md

@@ -244,6 +244,19 @@ foreach (LazyBrowseNode root in roots)
 and is safe under concurrent callers. To refresh after a Galaxy redeploy, call
 `BrowseAsync` again from the root.
 
+The CLI counterpart is `galaxy-browse`. Without `--parent` it walks the root
+objects and eagerly expands `--depth` further levels into an indented tree; with
+`--parent <gobject-id>` it fetches exactly one level of children for that object
+(`--depth` is ignored there). Filter flags map onto `BrowseChildrenOptions`:
+`--category-ids` and `--template-contains` are comma-separated lists,
+`--tag-name-glob` / `--alarm-bearing-only` / `--historized-only` are scalar, and
+`--include-attributes` overrides the server default for attribute population.
+
+```powershell
+dotnet run --project clients/dotnet/ZB.MOM.WW.MxGateway.Client.Cli -- galaxy-browse --endpoint http://localhost:5000 --api-key-env MXGATEWAY_API_KEY --depth 1
+dotnet run --project clients/dotnet/ZB.MOM.WW.MxGateway.Client.Cli -- galaxy-browse --endpoint http://localhost:5000 --api-key-env MXGATEWAY_API_KEY --parent 42 --json
+```
+
 ### Watching deploy events
 
 `WatchDeployEventsAsync` opens the `WatchDeployEvents` server-streaming RPC. The

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Cli/IMxGatewayCliClient.cs

@@ -105,4 +105,16 @@ public interface IMxGatewayCliClient : IAsyncDisposable
     IAsyncEnumerable<DeployEvent> GalaxyWatchDeployEventsAsync(
         WatchDeployEventsRequest request,
         CancellationToken cancellationToken);
+
+    /// <summary>
+    /// Fetches one page of direct children of a Galaxy parent (or the root
+    /// objects when the parent selector is unset), the primitive that backs the
+    /// lazy-browse helper.
+    /// </summary>
+    /// <param name="request">The browse-children request.</param>
+    /// <param name="cancellationToken">Cancellation token for the operation.</param>
+    /// <returns>The browse-children reply.</returns>
+    Task<BrowseChildrenReply> GalaxyBrowseChildrenAsync(
+        BrowseChildrenRequest request,
+        CancellationToken cancellationToken);
 }

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Cli/MxGatewayCliClientAdapter.cs

@@ -100,6 +100,14 @@ internal sealed class MxGatewayCliClientAdapter : IMxGatewayCliClient
         return _galaxyClient.Value.WatchDeployEventsRawAsync(request, cancellationToken);
     }
 
+    /// <inheritdoc />
+    public Task<BrowseChildrenReply> GalaxyBrowseChildrenAsync(
+        BrowseChildrenRequest request,
+        CancellationToken cancellationToken)
+    {
+        return _galaxyClient.Value.BrowseChildrenRawAsync(request, cancellationToken);
+    }
+
     /// <inheritdoc />
     public async ValueTask DisposeAsync()
     {

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Cli/MxGatewayClientCli.cs

@@ -144,6 +144,8 @@ public static class MxGatewayClientCli
                     .ConfigureAwait(false),
                 "galaxy-discover" => await GalaxyDiscoverAsync(arguments, client, standardOutput, cancellation.Token)
                     .ConfigureAwait(false),
+                "galaxy-browse" => await GalaxyBrowseAsync(arguments, client, standardOutput, standardError, cancellation.Token)
+                    .ConfigureAwait(false),
                 "galaxy-watch" => await GalaxyWatchAsync(arguments, client, standardOutput, cancellation.Token)
                     .ConfigureAwait(false),
                 _ => WriteUnknownCommand(command, standardError),
@@ -1607,6 +1609,270 @@ public static class MxGatewayClientCli
         return aggregate;
     }
 
+    /// <summary>
+    ///     Per-request page size for the galaxy-browse single-level walks. Mirrors
+    ///     the library's <c>BrowseChildrenPageSize</c> so the CLI and the
+    ///     lazy-browse helper page identically.
+    /// </summary>
+    private const int BrowseChildrenCliPageSize = 500;
+
+    /// <summary>
+    ///     Drives the lazy-browse Galaxy surface from the CLI. Without
+    ///     <c>--parent</c> it walks the root objects and eagerly expands
+    ///     <c>--depth</c> further levels (each level reuses the same
+    ///     <see cref="BrowseChildrenOptions"/>, like the library helper). With
+    ///     <c>--parent</c> it fetches exactly one level of children for that
+    ///     gobject id via a parent-scoped BrowseChildren request; <c>--depth</c>
+    ///     is not meaningful there and a warning is emitted if combined, mirroring
+    ///     the Go/Rust CLIs.
+    /// </summary>
+    private static async Task<int> GalaxyBrowseAsync(
+        CliArguments arguments,
+        IMxGatewayCliClient client,
+        TextWriter output,
+        TextWriter standardError,
+        CancellationToken cancellationToken)
+    {
+        BrowseChildrenOptions options = ParseBrowseChildrenOptions(arguments);
+        bool json = arguments.HasFlag("json");
+        int parent = arguments.GetInt32("parent", -1);
+        int depth = arguments.GetInt32("depth", 0);
+
+        // A specific parent → one level of children via the parent-scoped RPC.
+        if (parent >= 0)
+        {
+            if (depth > 0)
+            {
+                standardError.WriteLine("warning: --depth is ignored when --parent is specified.");
+            }
+
+            IReadOnlyList<GalaxyObject> children = await BrowseOneLevelAsync(
+                    client,
+                    options,
+                    parent,
+                    cancellationToken)
+                .ConfigureAwait(false);
+
+            if (json)
+            {
+                output.WriteLine(JsonSerializer.Serialize(
+                    new
+                    {
+                        command = "galaxy-browse",
+                        parentId = parent,
+                        children = children.Select(GalaxyObjectToJsonElement).ToArray(),
+                    },
+                    JsonOptions));
+                return 0;
+            }
+
+            output.WriteLine(children.Count.ToString(CultureInfo.InvariantCulture));
+            foreach (GalaxyObject child in children)
+            {
+                output.WriteLine(FormatGalaxyObject(child, level: 0, hasChildrenHint: null));
+            }
+
+            return 0;
+        }
+
+        // No parent → walk the root objects, eagerly expanding --depth levels.
+        IReadOnlyList<BrowseTreeNode> roots = await BrowseTreeAsync(
+                client,
+                options,
+                parentGobjectId: 0,
+                remainingDepth: depth,
+                cancellationToken)
+            .ConfigureAwait(false);
+
+        if (json)
+        {
+            output.WriteLine(JsonSerializer.Serialize(
+                new
+                {
+                    command = "galaxy-browse",
+                    nodes = roots.Select(BrowseTreeNodeToJson).ToArray(),
+                },
+                JsonOptions));
+            return 0;
+        }
+
+        output.WriteLine(roots.Count.ToString(CultureInfo.InvariantCulture));
+        foreach (BrowseTreeNode node in roots)
+        {
+            WriteBrowseTreeNode(output, node, level: 0);
+        }
+
+        return 0;
+    }
+
+    /// <summary>
+    ///     One node in the eagerly-expanded galaxy-browse tree: the Galaxy object,
+    ///     the server's has-children hint, and any children fetched up to the
+    ///     requested depth.
+    /// </summary>
+    private sealed record BrowseTreeNode(
+        GalaxyObject Object,
+        bool HasChildrenHint,
+        IReadOnlyList<BrowseTreeNode> Children);
+
+    /// <summary>
+    ///     Fetches the direct children of <paramref name="parentGobjectId"/>
+    ///     (0 = root) and recursively expands <paramref name="remainingDepth"/>
+    ///     further levels. Paging is followed to completion at each level.
+    /// </summary>
+    private static async Task<IReadOnlyList<BrowseTreeNode>> BrowseTreeAsync(
+        IMxGatewayCliClient client,
+        BrowseChildrenOptions options,
+        int parentGobjectId,
+        int remainingDepth,
+        CancellationToken cancellationToken)
+    {
+        List<BrowseTreeNode> nodes = [];
+        string pageToken = string.Empty;
+        HashSet<string> seenPageTokens = new(StringComparer.Ordinal);
+        do
+        {
+            BrowseChildrenRequest request = BuildBrowseChildrenRequest(options, parentGobjectId, pageToken);
+            BrowseChildrenReply reply = await client.GalaxyBrowseChildrenAsync(request, cancellationToken)
+                .ConfigureAwait(false);
+
+            for (int i = 0; i < reply.Children.Count; i++)
+            {
+                GalaxyObject child = reply.Children[i];
+                bool hint = i < reply.ChildHasChildren.Count && reply.ChildHasChildren[i];
+                IReadOnlyList<BrowseTreeNode> grandChildren = remainingDepth > 0
+                    ? await BrowseTreeAsync(client, options, child.GobjectId, remainingDepth - 1, cancellationToken)
+                        .ConfigureAwait(false)
+                    : [];
+                nodes.Add(new BrowseTreeNode(child, hint, grandChildren));
+            }
+
+            pageToken = reply.NextPageToken;
+            if (!string.IsNullOrWhiteSpace(pageToken) && !seenPageTokens.Add(pageToken))
+            {
+                throw new MxGatewayException(
+                    $"Galaxy BrowseChildren returned a repeated page token '{pageToken}'.");
+            }
+        }
+        while (!string.IsNullOrWhiteSpace(pageToken));
+
+        return nodes;
+    }
+
+    /// <summary>Fetches exactly one level of children for a parent gobject id, paging to completion.</summary>
+    private static async Task<IReadOnlyList<GalaxyObject>> BrowseOneLevelAsync(
+        IMxGatewayCliClient client,
+        BrowseChildrenOptions options,
+        int parentGobjectId,
+        CancellationToken cancellationToken)
+    {
+        List<GalaxyObject> children = [];
+        string pageToken = string.Empty;
+        HashSet<string> seenPageTokens = new(StringComparer.Ordinal);
+        do
+        {
+            BrowseChildrenRequest request = BuildBrowseChildrenRequest(options, parentGobjectId, pageToken);
+            BrowseChildrenReply reply = await client.GalaxyBrowseChildrenAsync(request, cancellationToken)
+                .ConfigureAwait(false);
+
+            children.AddRange(reply.Children);
+            pageToken = reply.NextPageToken;
+            if (!string.IsNullOrWhiteSpace(pageToken) && !seenPageTokens.Add(pageToken))
+            {
+                throw new MxGatewayException(
+                    $"Galaxy BrowseChildren returned a repeated page token '{pageToken}'.");
+            }
+        }
+        while (!string.IsNullOrWhiteSpace(pageToken));
+
+        return children;
+    }
+
+    private static BrowseChildrenOptions ParseBrowseChildrenOptions(CliArguments arguments)
+    {
+        return new BrowseChildrenOptions
+        {
+            CategoryIds = ParseOptionalInt32List(arguments.GetOptional("category-ids")),
+            TemplateChainContains = ParseOptionalStringList(arguments.GetOptional("template-contains")),
+            TagNameGlob = arguments.GetOptional("tag-name-glob"),
+            AlarmBearingOnly = arguments.HasFlag("alarm-bearing-only"),
+            HistorizedOnly = arguments.HasFlag("historized-only"),
+            // Tri-state: only override the server default when the flag is present.
+            IncludeAttributes = arguments.HasFlag("include-attributes") ? true : null,
+        };
+    }
+
+    private static BrowseChildrenRequest BuildBrowseChildrenRequest(
+        BrowseChildrenOptions options,
+        int parentGobjectId,
+        string pageToken)
+    {
+        BrowseChildrenRequest request = new()
+        {
+            PageSize = BrowseChildrenCliPageSize,
+            PageToken = pageToken,
+            ParentGobjectId = parentGobjectId,
+            AlarmBearingOnly = options.AlarmBearingOnly,
+            HistorizedOnly = options.HistorizedOnly,
+        };
+        request.CategoryIds.Add(options.CategoryIds);
+        request.TemplateChainContains.Add(options.TemplateChainContains);
+        if (!string.IsNullOrWhiteSpace(options.TagNameGlob))
+        {
+            request.TagNameGlob = options.TagNameGlob;
+        }
+
+        if (options.IncludeAttributes.HasValue)
+        {
+            request.IncludeAttributes = options.IncludeAttributes.Value;
+        }
+
+        return request;
+    }
+
+    private static void WriteBrowseTreeNode(TextWriter output, BrowseTreeNode node, int level)
+    {
+        output.WriteLine(FormatGalaxyObject(node.Object, level, node.HasChildrenHint));
+        foreach (BrowseTreeNode child in node.Children)
+        {
+            WriteBrowseTreeNode(output, child, level + 1);
+        }
+    }
+
+    private static string FormatGalaxyObject(GalaxyObject galaxyObject, int level, bool? hasChildrenHint)
+    {
+        string indent = new(' ', level * 2);
+        string suffix = hasChildrenHint is null
+            ? $"(attrs={galaxyObject.Attributes.Count})"
+            : $"(attrs={galaxyObject.Attributes.Count}, hasChildren={hasChildrenHint.Value})";
+        return $"{indent}{galaxyObject.GobjectId}\t{galaxyObject.TagName}\t{galaxyObject.BrowseName}\t{suffix}";
+    }
+
+    private static object BrowseTreeNodeToJson(BrowseTreeNode node)
+    {
+        return new
+        {
+            @object = GalaxyObjectToJsonElement(node.Object),
+            hasChildren = node.HasChildrenHint,
+            children = node.Children.Select(BrowseTreeNodeToJson).ToArray(),
+        };
+    }
+
+    private static JsonElement GalaxyObjectToJsonElement(GalaxyObject galaxyObject)
+    {
+        return JsonDocument.Parse(ProtobufJsonFormatter.Format(galaxyObject)).RootElement.Clone();
+    }
+
+    private static IReadOnlyList<int> ParseOptionalInt32List(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? [] : ParseInt32List(value);
+    }
+
+    private static IReadOnlyList<string> ParseOptionalStringList(string? value)
+    {
+        return string.IsNullOrWhiteSpace(value) ? [] : ParseStringList(value);
+    }
+
     private static async Task<int> GalaxyWatchAsync(
         CliArguments arguments,
         IMxGatewayCliClient client,
@@ -1736,6 +2002,7 @@ public static class MxGatewayClientCli
             or "galaxy-test-connection"
             or "galaxy-last-deploy"
             or "galaxy-discover"
+            or "galaxy-browse"
             or "galaxy-watch";
     }
 
@@ -1797,6 +2064,7 @@ public static class MxGatewayClientCli
         writer.WriteLine("mxgw-dotnet galaxy-test-connection [--json]");
         writer.WriteLine("mxgw-dotnet galaxy-last-deploy [--json]");
         writer.WriteLine("mxgw-dotnet galaxy-discover [--json]");
+        writer.WriteLine("mxgw-dotnet galaxy-browse [--parent <gobject-id>] [--depth <n>] [--category-ids <n,n>] [--template-contains <s,s>] [--tag-name-glob <glob>] [--alarm-bearing-only] [--historized-only] [--include-attributes] [--json]");
         writer.WriteLine("mxgw-dotnet galaxy-watch [--last-seen-deploy-time <iso8601>] [--max-events <n>] [--json]");
     }
 }

clients/dotnet/ZB.MOM.WW.MxGateway.Client.Tests/MxGatewayClientCliTests.cs

@@ -360,6 +360,146 @@ public sealed class MxGatewayClientCliTests
         Assert.Equal(string.Empty, error.ToString());
     }
 
+    /// <summary>
+    /// Verifies galaxy-browse walks root objects and eagerly expands one further
+    /// level when --depth 1 is passed, printing an indented tree.
+    /// </summary>
+    [Fact]
+    public async Task RunAsync_GalaxyBrowse_TextTreeExpandsToDepth()
+    {
+        using var output = new StringWriter();
+        using var error = new StringWriter();
+        FakeCliClient fakeClient = new();
+        // Root level (parent 0): one area with a child hint.
+        fakeClient.GalaxyBrowseChildrenReplies[0] = new Queue<BrowseChildrenReply>(
+        [
+            new BrowseChildrenReply
+            {
+                Children = { new GalaxyObject { GobjectId = 10, TagName = "Area_001", BrowseName = "Area" } },
+                ChildHasChildren = { true },
+            },
+        ]);
+        // Children of gobject 10.
+        fakeClient.GalaxyBrowseChildrenReplies[10] = new Queue<BrowseChildrenReply>(
+        [
+            new BrowseChildrenReply
+            {
+                Children = { new GalaxyObject { GobjectId = 20, TagName = "Tank_001", BrowseName = "Tank" } },
+            },
+        ]);
+
+        int exitCode = await MxGatewayClientCli.RunAsync(
+            [
+                "galaxy-browse",
+                "--endpoint",
+                "http://localhost:5000",
+                "--api-key",
+                "test-api-key",
+                "--depth",
+                "1",
+            ],
+            output,
+            error,
+            _ => fakeClient);
+
+        Assert.Equal(0, exitCode);
+        string text = output.ToString();
+        Assert.Contains("Area_001", text);
+        Assert.Contains("Tank_001", text);
+        // Children are indented beneath their parent (two-space indent per level).
+        Assert.Matches(@"\n  \d+\tTank_001", text);
+        // Root fetched with the parent oneof unset; child fetch used parent 10.
+        Assert.Contains(
+            fakeClient.GalaxyBrowseChildrenRequests,
+            request => request.ParentCase == BrowseChildrenRequest.ParentOneofCase.ParentGobjectId
+                && request.ParentGobjectId == 10);
+        Assert.Equal(string.Empty, error.ToString());
+    }
+
+    /// <summary>
+    /// Verifies galaxy-browse --json emits a nested JSON document and forwards
+    /// the filter flags onto the BrowseChildren request.
+    /// </summary>
+    [Fact]
+    public async Task RunAsync_GalaxyBrowse_JsonForwardsFilters()
+    {
+        using var output = new StringWriter();
+        using var error = new StringWriter();
+        FakeCliClient fakeClient = new();
+        fakeClient.GalaxyBrowseChildrenReplies[0] = new Queue<BrowseChildrenReply>(
+        [
+            new BrowseChildrenReply
+            {
+                Children = { new GalaxyObject { GobjectId = 10, TagName = "Area_001", BrowseName = "Area" } },
+            },
+        ]);
+
+        int exitCode = await MxGatewayClientCli.RunAsync(
+            [
+                "galaxy-browse",
+                "--endpoint",
+                "http://localhost:5000",
+                "--api-key",
+                "test-api-key",
+                "--tag-name-glob",
+                "Area*",
+                "--alarm-bearing-only",
+                "--json",
+            ],
+            output,
+            error,
+            _ => fakeClient);
+
+        Assert.Equal(0, exitCode);
+        using System.Text.Json.JsonDocument document = System.Text.Json.JsonDocument.Parse(output.ToString());
+        Assert.Equal("galaxy-browse", document.RootElement.GetProperty("command").GetString());
+        Assert.True(document.RootElement.GetProperty("nodes").GetArrayLength() >= 1);
+        BrowseChildrenRequest request = Assert.Single(fakeClient.GalaxyBrowseChildrenRequests);
+        Assert.Equal("Area*", request.TagNameGlob);
+        Assert.True(request.AlarmBearingOnly);
+        Assert.Equal(string.Empty, error.ToString());
+    }
+
+    /// <summary>
+    /// Verifies galaxy-browse --parent fetches exactly one level of children for
+    /// the supplied gobject id via a parent-scoped BrowseChildren request.
+    /// </summary>
+    [Fact]
+    public async Task RunAsync_GalaxyBrowse_ParentFetchesSingleLevel()
+    {
+        using var output = new StringWriter();
+        using var error = new StringWriter();
+        FakeCliClient fakeClient = new();
+        fakeClient.GalaxyBrowseChildrenReplies[10] = new Queue<BrowseChildrenReply>(
+        [
+            new BrowseChildrenReply
+            {
+                Children = { new GalaxyObject { GobjectId = 20, TagName = "Tank_001", BrowseName = "Tank" } },
+            },
+        ]);
+
+        int exitCode = await MxGatewayClientCli.RunAsync(
+            [
+                "galaxy-browse",
+                "--endpoint",
+                "http://localhost:5000",
+                "--api-key",
+                "test-api-key",
+                "--parent",
+                "10",
+            ],
+            output,
+            error,
+            _ => fakeClient);
+
+        Assert.Equal(0, exitCode);
+        Assert.Contains("Tank_001", output.ToString());
+        BrowseChildrenRequest request = Assert.Single(fakeClient.GalaxyBrowseChildrenRequests);
+        Assert.Equal(BrowseChildrenRequest.ParentOneofCase.ParentGobjectId, request.ParentCase);
+        Assert.Equal(10, request.ParentGobjectId);
+        Assert.Equal(string.Empty, error.ToString());
+    }
+
     /// <summary>Verifies that galaxy-watch command prints text output for deploy events.</summary>
     [Fact]
     public async Task RunAsync_GalaxyWatch_PrintsTextOutputForEvents()
@@ -1051,5 +1191,33 @@ public sealed class MxGatewayClientCliTests
                 yield return deployEvent;
             }
         }
+
+        /// <summary>List of received galaxy browse-children requests, in call order.</summary>
+        public List<BrowseChildrenRequest> GalaxyBrowseChildrenRequests { get; } = [];
+
+        /// <summary>
+        /// Per-parent browse-children replies keyed by <c>parent_gobject_id</c>
+        /// (0 = root). Each parent's queue is dequeued in page order; an absent
+        /// or exhausted queue yields an empty reply.
+        /// </summary>
+        public Dictionary<int, Queue<BrowseChildrenReply>> GalaxyBrowseChildrenReplies { get; } = [];
+
+        /// <inheritdoc />
+        public Task<BrowseChildrenReply> GalaxyBrowseChildrenAsync(
+            BrowseChildrenRequest request,
+            CancellationToken cancellationToken)
+        {
+            GalaxyBrowseChildrenRequests.Add(request);
+            int parentId = request.ParentCase == BrowseChildrenRequest.ParentOneofCase.ParentGobjectId
+                ? request.ParentGobjectId
+                : 0;
+            if (GalaxyBrowseChildrenReplies.TryGetValue(parentId, out Queue<BrowseChildrenReply>? queue)
+                && queue.TryDequeue(out BrowseChildrenReply? reply))
+            {
+                return Task.FromResult(reply);
+            }
+
+            return Task.FromResult(new BrowseChildrenReply());
+        }
     }
 }