Joseph Doherty
e719dd51c1
The single auto-refreshing zero-JS status page gave operators a 25-column wall and no way to drill into one connection. This adds a Bootstrap fleet dashboard (filterable/sortable KPI table) and a per-PLC detail page with a real-time debug view of raw PLC-side BCD vs. decoded client-side values, streamed live over a SignalR feed. The debug view is fed by an on-demand per-tag value capture, armed only while a detail page is open. All assets (Bootstrap, SignalR client, fonts) are embedded so the UI works unchanged on firewalled networks; GET /status.json is untouched for scrapers. Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
68 lines
2.7 KiB
C#
68 lines
2.7 KiB
C#
using Mbproxy.Proxy;
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using Microsoft.AspNetCore.SignalR;
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namespace Mbproxy.Admin;
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/// <summary>
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/// SignalR hub backing the live admin dashboard. Two subscription scopes:
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/// <list type="bullet">
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/// <item><see cref="SubscribeFleet"/> — the fleet dashboard (<c>GET /</c>) joins the
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/// <see cref="FleetGroup"/> group and receives a <c>"fleet"</c> message every
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/// push tick.</item>
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/// <item><see cref="SubscribePlc"/> — a connection-detail page (<c>GET /plc/{name}</c>)
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/// joins <see cref="PlcGroup"/> and receives a <c>"plc"</c> message. The first
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/// subscriber to a PLC arms that PLC's tag-value capture; the last to leave
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/// disarms it (on-demand capture).</item>
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/// </list>
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///
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/// <para>The hub itself is transient (one instance per call). Cross-call state — the
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/// subscriber counts that drive capture arming — lives in the singleton
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/// <see cref="PlcSubscriptionTracker"/>. The actual pushes are issued by
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/// <see cref="StatusBroadcaster"/>, not the hub.</para>
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/// </summary>
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internal sealed class StatusHub : Hub
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{
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/// <summary>SignalR group name for fleet-dashboard subscribers.</summary>
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public const string FleetGroup = "fleet";
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/// <summary>SignalR group name for a single PLC's detail-page subscribers.</summary>
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public static string PlcGroup(string plcName) => "plc:" + plcName;
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private readonly PlcSubscriptionTracker _tracker;
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private readonly TagCaptureRegistry _captureRegistry;
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public StatusHub(PlcSubscriptionTracker tracker, TagCaptureRegistry captureRegistry)
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{
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_tracker = tracker;
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_captureRegistry = captureRegistry;
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}
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/// <summary>Subscribes the calling connection to fleet-wide status pushes.</summary>
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public Task SubscribeFleet()
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=> Groups.AddToGroupAsync(Context.ConnectionId, FleetGroup);
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/// <summary>
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/// Subscribes the calling connection to one PLC's detail pushes and arms that PLC's
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/// tag-value capture if this is its first viewer.
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/// </summary>
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public async Task SubscribePlc(string plcName)
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{
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await Groups.AddToGroupAsync(Context.ConnectionId, PlcGroup(plcName)).ConfigureAwait(false);
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if (_tracker.Add(Context.ConnectionId, plcName))
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_captureRegistry.Arm(plcName); // no-op for an unknown PLC name
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}
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/// <summary>
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/// On disconnect, drops every subscription the connection held and disarms the
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/// capture of any PLC whose last viewer just left.
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/// </summary>
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public override Task OnDisconnectedAsync(Exception? exception)
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{
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foreach (var plcName in _tracker.RemoveConnection(Context.ConnectionId))
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_captureRegistry.Disarm(plcName);
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return base.OnDisconnectedAsync(exception);
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}
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}
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