lmxopcua/tools/opcuacli-dotnet/Commands/RedundancyCommand.cs

using CliFx;
using CliFx.Attributes;
using CliFx.Infrastructure;
using Opc.Ua;
using Opc.Ua.Client;

namespace OpcUaCli.Commands;

[Command("redundancy", Description = "Read redundancy state from an OPC UA server")]
public class RedundancyCommand : ICommand
{
    [CommandOption("url", 'u', Description = "OPC UA server endpoint URL", IsRequired = true)]
    public string Url { get; init; } = default!;

    [CommandOption("username", 'U', Description = "Username for authentication")]
    public string? Username { get; init; }

    [CommandOption("password", 'P', Description = "Password for authentication")]
    public string? Password { get; init; }

    [CommandOption("security", 'S', Description = "Transport security: none, sign, encrypt (default: none)")]
    public string Security { get; init; } = "none";

    [CommandOption("failover-urls", 'F', Description = "Comma-separated failover endpoint URLs for redundancy")]
    public string? FailoverUrls { get; init; }

    public async ValueTask ExecuteAsync(IConsole console)
    {
        var urls = FailoverUrlParser.Parse(Url, FailoverUrls);
        using var failover = new OpcUaFailoverHelper(urls, Username, Password, Security);
        using var session = await failover.ConnectAsync();

        // Read RedundancySupport
        var redundancySupportValue = await session.ReadValueAsync(VariableIds.Server_ServerRedundancy_RedundancySupport);
        var redundancyMode = (RedundancySupport)(int)redundancySupportValue.Value;
        await console.Output.WriteLineAsync($"Redundancy Mode:  {redundancyMode}");

        // Read ServiceLevel
        var serviceLevelValue = await session.ReadValueAsync(VariableIds.Server_ServiceLevel);
        var serviceLevel = (byte)serviceLevelValue.Value;
        await console.Output.WriteLineAsync($"Service Level:    {serviceLevel}");

        // Read ServerUriArray (only present for non-transparent redundancy)
        try
        {
            var serverUriArrayValue = await session.ReadValueAsync(VariableIds.Server_ServerRedundancy_ServerUriArray);
            if (serverUriArrayValue.Value is string[] uris && uris.Length > 0)
            {
                await console.Output.WriteLineAsync("Server URIs:");
                foreach (var uri in uris)
                {
                    await console.Output.WriteLineAsync($"  - {uri}");
                }
            }
        }
        catch
        {
            // ServerUriArray may not be present when RedundancySupport is None
        }

        // Read ServerArray for the local server's ApplicationUri
        try
        {
            var serverArrayValue = await session.ReadValueAsync(VariableIds.Server_ServerArray);
            if (serverArrayValue.Value is string[] serverArray && serverArray.Length > 0)
            {
                await console.Output.WriteLineAsync($"Application URI:  {serverArray[0]}");
            }
        }
        catch
        {
            // Informational only
        }
    }
}