[Nats] Add overload for NatsOptions with IServiceProvider

src/HealthChecks.Nats/DependencyInjection/NatsHealthCheckBuilderExtensions.cs

@@ -48,4 +48,44 @@ public static IHealthChecksBuilder AddNats(
             tags,
             timeout));
     }
+
+    /// <summary>
+    /// Add a health check for Nats.
+    /// </summary>
+    /// <param name="builder">The <see cref="IHealthChecksBuilder"/>.</param>
+    /// <param name="setup">The factory to configure the Nats setup.</param>
+    /// <param name="name">
+    /// The health check name.
+    /// Optional.
+    /// If <see langword="null"/> the type name 'nats' will be used for the name.
+    /// </param>
+    /// <param name="failureStatus">
+    /// The <see cref="HealthStatus"/> that should be reported when the health check fails.
+    /// Optional.
+    /// If <see langword="null"/> then the default status of <see cref="HealthStatus.Unhealthy"/> will be reported.
+    /// </param>
+    /// <param name="tags">A list of tags that can be used to filter sets of health checks. Optional.</param>
+    /// <param name="timeout">An optional System.TimeSpan representing the timeout of the check.</param>
+    /// <returns>The <see cref="IHealthChecksBuilder"/>.</returns>
+    public static IHealthChecksBuilder AddNats(
+        this IHealthChecksBuilder builder,
+        Action<IServiceProvider, NatsOptions>? setup,
+        string? name = default,
+        HealthStatus? failureStatus = default,
+        IEnumerable<string>? tags = default,
+        TimeSpan? timeout = default)
+    {
+        return builder.Add(new HealthCheckRegistration(
+            name ?? NAME,
+            sp =>
+            {
+                var options = new NatsOptions();
+                setup?.Invoke(sp, options);
+
+                return new NatsHealthCheck(options);
+            },
+            failureStatus,
+            tags,
+            timeout));
+    }
 }

test/HealthChecks.Nats.Tests/DependencyInjection/RegistrationTests.cs

@@ -23,6 +23,27 @@ public void add_health_check_when_demo_instance_properly_configured() =>
             setup => setup.Url = DemoConnectionString,
             check => check.ShouldBeOfType<NatsHealthCheck>());
 
+    [Fact]
+    public void add_health_check_with_service_provider()
+    {
+        var services = new ServiceCollection();
+
+        services
+            .AddSingleton<IDependency, Dependency>()
+            .AddHealthChecks()
+            .AddNats((sp, setup) => setup.Url = sp.GetRequiredService<IDependency>().ConnectionString);
+
+        var serviceProvider = services.BuildServiceProvider();
+        var options = serviceProvider.GetRequiredService<IOptions<HealthCheckServiceOptions>>();
+
+        var registration = options.Value.Registrations.First();
+        registration.Name.ShouldBe(NatsName);
+
+        var check = registration.Factory(serviceProvider);
+
+        check.ShouldBeOfType<NatsHealthCheck>();
+    }
+
     private void RegistrationFact(Action<NatsOptions> setup, Action<IHealthCheck> assert, string? name = null)
     {
         var services = new ServiceCollection();
@@ -37,4 +58,14 @@ private void RegistrationFact(Action<NatsOptions> setup, Action<IHealthCheck> as
         var check = registration.Factory(serviceProvider);
         assert(check);
     }
+
+    private interface IDependency
+    {
+        string ConnectionString { get; }
+    }
+
+    private class Dependency : IDependency
+    {
+        public string ConnectionString => DemoConnectionString;
+    }
 }

test/HealthChecks.Nats.Tests/HealthChecks.Nats.approved.txt

@@ -20,5 +20,6 @@ namespace Microsoft.Extensions.DependencyInjection
     public static class NatsHealthCheckBuilderExtensions
     {
         public static Microsoft.Extensions.DependencyInjection.IHealthChecksBuilder AddNats(this Microsoft.Extensions.DependencyInjection.IHealthChecksBuilder builder, System.Action<HealthChecks.Nats.NatsOptions>? setup, string? name = null, Microsoft.Extensions.Diagnostics.HealthChecks.HealthStatus? failureStatus = default, System.Collections.Generic.IEnumerable<string>? tags = null, System.TimeSpan? timeout = default) { }
+        public static Microsoft.Extensions.DependencyInjection.IHealthChecksBuilder AddNats(this Microsoft.Extensions.DependencyInjection.IHealthChecksBuilder builder, System.Action<System.IServiceProvider, HealthChecks.Nats.NatsOptions>? setup, string? name = null, Microsoft.Extensions.Diagnostics.HealthChecks.HealthStatus? failureStatus = default, System.Collections.Generic.IEnumerable<string>? tags = null, System.TimeSpan? timeout = default) { }
     }
 }