Minecraft-Phantom-Panel/Web/Phantom.Web/Pages/Events.razor

@page "/events"
@attribute [Authorize(Permission.ViewEventsPolicy)]
@using System.Collections.Immutable
@using Phantom.Common.Data.Web.EventLog
@using Phantom.Common.Data.Web.Users
@using Phantom.Web.Services.Agents
@using Phantom.Web.Services.Events
@using Phantom.Web.Services.Instances
@inherits Phantom.Web.Components.PhantomComponent
@inject AgentManager AgentManager
@inject EventLogManager EventLogManager
@inject InstanceManager InstanceManager

<h1>Event Log</h1>

<Table TItem="EventLogItem" Items="logItems">
  <HeaderRow>
    <Column Class="text-end" MinWidth="200px">Time</Column>
    <Column>Agent</Column>
    <Column>Event Type</Column>
    <Column>Subject</Column>
    <Column Width="100%">Data</Column>
  </HeaderRow>
  <ItemRow Context="logItem">
    <Cell class="text-end">
      <TimeWithOffset Time="logItem.UtcTime.ToLocalTime()" />
    </Cell>
    <Cell>
      @if (logItem.AgentGuid is {} agentGuid) {
        <p class="fw-semibold">@(GetAgentName(agentGuid))</p>
        <small class="font-monospace text-uppercase">@agentGuid.ToString()</small>
      }
      else {
        <text>-</text>
      }
    </Cell>
    <Cell>@logItem.EventType.ToNiceString()</Cell>
    <Cell>
      <p class="fw-semibold">@(GetSubjectName(logItem.SubjectType, logItem.SubjectId) ?? "-")</p>
      <small class="font-monospace text-uppercase">@(logItem.SubjectId)</small>
    </Cell>
    <Cell>
      <code>@logItem.JsonData</code>
    </Cell>
  </ItemRow>
  <NoItemsRow>
    No event log entries found.
  </NoItemsRow>
</Table>

@code {

  private CancellationTokenSource? initializationCancellationTokenSource;
  private ImmutableArray<EventLogItem>? logItems;
  private ImmutableDictionary<Guid, string> agentNamesByGuid = ImmutableDictionary<Guid, string>.Empty;
  private ImmutableDictionary<Guid, string> instanceNamesByGuid = ImmutableDictionary<Guid, string>.Empty;

  protected override async Task OnInitializedAsync() {
    initializationCancellationTokenSource = new CancellationTokenSource();
    var cancellationToken = initializationCancellationTokenSource.Token;

    try {
      logItems = await EventLogManager.GetMostRecentItems(50, cancellationToken);
      agentNamesByGuid = AgentManager.GetAll().ToImmutableDictionary(static kvp => kvp.AgentGuid, static kvp => kvp.Configuration.AgentName);
      instanceNamesByGuid = InstanceManager.GetAll().Values.ToImmutableDictionary(static instance => instance.InstanceGuid, static instance => instance.Configuration.InstanceName);
    } finally {
      initializationCancellationTokenSource.Dispose();
    }
  }

  private string GetAgentName(Guid agentGuid) {
    return agentNamesByGuid.TryGetValue(agentGuid, out var name) ? name : "?";
  }

  private string? GetSubjectName(EventLogSubjectType type, string id) {
    return type switch {
      EventLogSubjectType.Instance => instanceNamesByGuid.TryGetValue(Guid.Parse(id), out var name) ? name : null,
      _                            => null
    };
  }

  protected override void OnDisposed() {
    try {
      initializationCancellationTokenSource?.Cancel();
    } catch (ObjectDisposedException) {}
  }

}