Added LDAP health checks

src/HealthChecks/LDAPHealthChecks.cs

@@ -0,0 +1,31 @@
+using Berufsschule_HAM.Services;
+using Microsoft.Extensions.Diagnostics.HealthChecks;
+namespace Berufsschule_HAM.HealthChecks;
+
+public class DatabaseHealthCheck : IHealthCheck
+{
+    private readonly ILogger<DatabaseHealthCheck> _logger;
+    private readonly LdapService _ldapService;
+
+    public DatabaseHealthCheck(ILogger<DatabaseHealthCheck> logger, LdapService ldapService)
+    {
+        _logger = logger;
+        _ldapService = ldapService;
+    }
+
+    public async Task<HealthCheckResult> CheckHealthAsync(HealthCheckContext context, CancellationToken cancellationToken = default)
+    {
+        _logger.LogTrace("CheckHealthAsync - Checking health");
+        try
+        {
+            await _ldapService.ListUsersAsync();
+        }
+        catch (Exception ex)
+        {
+            _logger.LogError(ex, "CheckHealthAsync - Unable to list users due to exception {ex.Message} - {ex.StackTrace}", [ex.Message, ex.StackTrace]);
+            return HealthCheckResult.Unhealthy();
+        }
+        _logger.LogTrace("CheckHealthAsync - Health check successful");
+        return HealthCheckResult.Healthy();
+    }
+}

src/Program.cs

@@ -4,6 +4,7 @@ using Serilog;
 using Microsoft.AspNetCore.Authentication.Cookies;
 using Berufsschule_HAM.Services;
 using Berufsschule_HAM.Models;
+using Berufsschule_HAM.HealthChecks;
 var builder = WebApplication.CreateBuilder(args);
 
 // Bind options
@@ -26,6 +27,9 @@ builder.Services.AddElmah<XmlFileErrorLog>(Options =>
 builder.Services.AddSingleton<LdapService>();
 builder.Services.AddSingleton<MigrationService>();
 
+builder.Services.AddHealthChecks()
+    .AddCheck<DatabaseHealthCheck>("DatabaseHealthCheck");
+
 builder.Services.AddAuthentication(CookieAuthenticationDefaults.AuthenticationScheme)
     .AddCookie(options =>
     {
@@ -53,6 +57,8 @@ app.MapControllerRoute(
     name: "default",
     pattern: "{controller=Home}/{action=Index}/{id?}");
 
+app.MapHealthChecks("/healthz");
+
 // Run migrations
 using var scope = app.Services.CreateScope();
 var migrationService = scope.ServiceProvider.GetRequiredService<MigrationService>();