TekH
5b67035a07
- Change HealthCheckHtmlGenerator to use DateTime.Now instead of DateTime.UtcNow - Change ProfileWorker health check timestamps to use DateTime.Now - Change Program health check endpoint to use DateTime.Now - Ensures consistent local time usage across the application
338 lines
13 KiB
C#
338 lines
13 KiB
C#
using Microsoft.Extensions.Diagnostics.HealthChecks;
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using System.Text;
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namespace ECMJobRunner.WebCron.HealthCheck;
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/// <summary>
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/// Generates HTML representation of ASP.NET Core health check reports.
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/// Produces a Bootstrap 5-based UI with auto-refresh, status indicators, and detailed metrics.
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/// </summary>
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public static class HealthCheckHtmlGenerator
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{
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private static readonly string CacheId = Guid.NewGuid().ToString();
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/// <summary>
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/// Generates a complete HTML page for displaying health check results.
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/// </summary>
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/// <param name="report">The health check report containing service status information.</param>
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/// <returns>A complete HTML document string ready to be sent as HTTP response.</returns>
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/// <remarks>
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/// The generated UI includes:
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/// <list type="bullet">
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/// <item><description>Navigation links to Hangfire, Serilog.UI, and health endpoints</description></item>
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/// <item><description>Overall health status with color-coded badge</description></item>
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/// <item><description>Summary card with total duration and check count</description></item>
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/// <item><description>Individual check cards with detailed metrics and exception info</description></item>
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/// <item><description>Auto-refresh countdown (10 seconds)</description></item>
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/// </list>
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/// External dependencies:
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/// <list type="bullet">
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/// <item><description>Bootstrap 5.3.0 (CDN)</description></item>
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/// <item><description>/css/health-ui.css (custom styles)</description></item>
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/// <item><description>/js/health-ui.js (auto-refresh logic)</description></item>
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/// </list>
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/// </remarks>
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public static string Generate(HealthReport report)
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{
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var sb = new StringBuilder();
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sb.AppendLine(@$"
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset=""UTF-8"">
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<meta name=""viewport"" content=""width=device-width, initial-scale=1.0"">
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<title>Health Check - ECMJobRunner</title>
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<link rel=""stylesheet"" href=""https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css"" />
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<link rel=""stylesheet"" href=""/css/health-ui.css?cache={CacheId}"" />
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<script src=""/js/health-ui.js?cache={CacheId}""></script>
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</head>
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<body>");
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// Navigation
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AppendNavigation(sb);
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// Overall Status Header
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AppendOverallStatus(sb, report);
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// Summary Card
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AppendSummaryCard(sb, report);
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// Individual Checks
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AppendIndividualChecks(sb, report);
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// Refresh Info
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AppendRefreshInfo(sb);
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sb.AppendLine(@"
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</body>
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</html>");
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return sb.ToString();
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}
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/// <summary>
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/// Appends the navigation menu with links to application dashboards.
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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private static void AppendNavigation(StringBuilder sb)
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{
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sb.Append(@"
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<div class=""container-fluid"">
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<div class=""nav-links"">");
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// Append emojis separately (not in verbatim string)
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sb.AppendLine();
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sb.Append(" <a href=\"/\">🏠 Home</a>");
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sb.AppendLine();
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sb.Append(" <a href=\"/hangfire\">🔧 Hangfire Dashboard</a>");
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sb.AppendLine();
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sb.Append(" <a href=\"/serilog-ui\">📋 Logs (Serilog.UI)</a>");
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sb.AppendLine();
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sb.Append(" <a href=\"/health\">📊 Health API</a>");
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sb.AppendLine();
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sb.AppendLine(" </div>");
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}
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/// <summary>
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/// Appends the overall status header showing aggregate health and timestamp.
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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/// <param name="report">The health check report.</param>
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private static void AppendOverallStatus(StringBuilder sb, HealthReport report)
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{
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var statusClass = GetStatusClass(report.Status);
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var badgeClass = GetBadgeClass(report.Status);
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var icon = GetStatusIcon(report.Status);
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sb.Append($@"
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<div class=""header-card"">
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<div class=""d-flex justify-content-between align-items-center"">
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<div>
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<h1 class=""mb-2"">");
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sb.Append(icon);
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sb.Append($@" Health Check Status</h1>
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<p class=""text-muted mb-0"">Last checked: {DateTime.Now:yyyy-MM-dd HH:mm:ss} UTC</p>
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</div>
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<div>
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<h2><span class=""badge {badgeClass} fs-3"">{report.Status}</span></h2>
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</div>
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</div>
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</div>
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<div class=""row"">
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<div class=""col-md-4"">");
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}
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/// <summary>
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/// Appends the summary card displaying aggregate metrics (status, duration, check count).
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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/// <param name="report">The health check report.</param>
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private static void AppendSummaryCard(StringBuilder sb, HealthReport report)
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{
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var statusClass = GetStatusClass(report.Status);
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sb.Append(@"
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<div class=""card"">
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<div class=""card-header bg-primary text-white"">");
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sb.AppendLine();
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sb.Append(" 📊 Summary");
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sb.AppendLine();
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sb.Append($@" </div>
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<div class=""card-body"">
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<div class=""metric"">
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<span class=""metric-label"">Overall Status:</span>
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<strong class=""{statusClass}"">{report.Status}</strong>
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</div>
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<div class=""metric"">
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<span class=""metric-label"">Total Duration:</span>
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<span class=""metric-value"">{report.TotalDuration.TotalMilliseconds:F0} ms</span>
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</div>
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<div class=""metric"">
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<span class=""metric-label"">Checks:</span>
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<span class=""metric-value"">{report.Entries.Count}</span>
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</div>
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</div>
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</div>
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</div>
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<div class=""col-md-8"">");
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}
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/// <summary>
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/// Appends individual health check result cards with detailed metrics.
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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/// <param name="report">The health check report containing check entries.</param>
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private static void AppendIndividualChecks(StringBuilder sb, HealthReport report)
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{
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foreach (var entry in report.Entries)
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{
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var checkStatusClass = GetStatusClass(entry.Value.Status);
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var checkBadgeClass = GetBadgeClass(entry.Value.Status);
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var checkIcon = GetStatusIcon(entry.Value.Status);
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sb.Append($@"
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<div class=""card"">
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<div class=""card-header bg-light"">
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<div class=""d-flex justify-content-between align-items-center"">
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<span>");
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sb.Append(checkIcon);
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sb.Append($@" <strong>{entry.Key}</strong></span>
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<span class=""badge {checkBadgeClass}"">{entry.Value.Status}</span>
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</div>
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</div>
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<div class=""card-body"">
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<div class=""metric"">
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<span class=""metric-label"">Description:</span>
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<span class=""metric-value"">{entry.Value.Description ?? "N/A"}</span>
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</div>
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<div class=""metric"">
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<span class=""metric-label"">Duration:</span>
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<span class=""metric-value"">{entry.Value.Duration.TotalMilliseconds:F0} ms</span>
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</div>");
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if (entry.Value.Exception != null)
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{
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sb.AppendLine($@"
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<div class=""metric"">
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<span class=""metric-label"">Exception:</span>
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<span class=""metric-value text-danger"" style=""word-break: break-all;"">{System.Net.WebUtility.HtmlEncode(entry.Value.Exception.Message)}</span>
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</div>");
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}
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if (entry.Value.Data.Any())
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{
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AppendCheckDetails(sb, entry.Value.Data);
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}
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sb.AppendLine(@"
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</div>
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</div>");
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}
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sb.AppendLine(@"
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</div>
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</div>
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</div>");
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}
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/// <summary>
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/// Appends a detail table for additional health check data (e.g., timestamps, counters).
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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/// <param name="data">Dictionary of custom data provided by the health check.</param>
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private static void AppendCheckDetails(StringBuilder sb, IReadOnlyDictionary<string, object> data)
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{
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sb.AppendLine(@"
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<div class=""mt-3"">
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<strong class=""metric-label"">Details:</strong>
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<table class=""table table-sm table-borderless mt-2"">");
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foreach (var item in data)
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{
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var value = FormatDataValue(item.Value);
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sb.AppendLine($@"
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<tr>
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<td class=""text-muted"" style=""width: 40%;"">{item.Key}</td>
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<td><strong>{value}</strong></td>
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</tr>");
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}
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sb.AppendLine(@"
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</table>
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</div>");
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}
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/// <summary>
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/// Appends the auto-refresh indicator widget with countdown timer.
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/// </summary>
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/// <param name="sb">The StringBuilder to append HTML to.</param>
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private static void AppendRefreshInfo(StringBuilder sb)
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{
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sb.AppendLine(@"
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<div class=""refresh-info"">");
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sb.AppendLine();
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sb.Append(" <span class=\"spinner\"></span> Auto-refresh in <strong><span id=\"countdown\">3</span>s</strong>");
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sb.AppendLine();
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sb.AppendLine(@" </div>");
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}
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/// <summary>
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/// Maps a health status to the corresponding CSS class name for styling.
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/// </summary>
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/// <param name="status">The health status.</param>
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/// <returns>CSS class name (e.g., "status-healthy", "status-degraded").</returns>
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private static string GetStatusClass(HealthStatus status)
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{
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return status switch
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{
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HealthStatus.Healthy => "status-healthy",
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HealthStatus.Degraded => "status-degraded",
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HealthStatus.Unhealthy => "status-unhealthy",
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_ => ""
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};
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}
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/// <summary>
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/// Maps a health status to the corresponding Bootstrap badge CSS class.
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/// </summary>
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/// <param name="status">The health status.</param>
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/// <returns>Badge CSS class name (e.g., "badge-healthy", "badge-degraded").</returns>
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private static string GetBadgeClass(HealthStatus status)
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{
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return status switch
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{
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HealthStatus.Healthy => "badge-healthy",
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HealthStatus.Degraded => "badge-degraded",
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HealthStatus.Unhealthy => "badge-unhealthy",
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_ => "badge-secondary"
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};
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}
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/// <summary>
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/// Maps a health status to the corresponding emoji icon.
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/// </summary>
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/// <param name="status">The health status.</param>
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/// <returns>Unicode emoji character (✅ for healthy, ⚠️ for degraded, ❌ for unhealthy).</returns>
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private static string GetStatusIcon(HealthStatus status)
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{
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return status switch
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{
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HealthStatus.Healthy => "✅",
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HealthStatus.Degraded => "⚠️",
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HealthStatus.Unhealthy => "❌",
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_ => "❓"
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};
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}
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/// <summary>
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/// Formats health check data values for display.
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/// Applies special formatting for common types (DateTime, TimeSpan).
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/// </summary>
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/// <param name="value">The data value to format.</param>
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/// <returns>
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/// Formatted string representation:
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/// <list type="bullet">
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/// <item><description><see cref="DateTime"/> → "yyyy-MM-dd HH:mm:ss"</description></item>
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/// <item><description><see cref="TimeSpan"/> → "{seconds}s"</description></item>
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/// <item><description>Other types → ToString() or "N/A" if null</description></item>
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/// </list>
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/// </returns>
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private static string FormatDataValue(object? value)
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{
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if (value == null)
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return "N/A";
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if (value is DateTime dt)
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return dt.ToString("yyyy-MM-dd HH:mm:ss");
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if (value is TimeSpan ts)
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return $"{ts.TotalSeconds:F1}s";
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return value.ToString() ?? "N/A";
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}
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}
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