TCP Health probe

We provide a TCP health probe endpoint that allows a runtime to periodically check the liveness/readiness of the host based on the .NET Core health checks.

Installation

This features requires to install our NuGet package:

PM > Install-Package Arcus.Messaging.Health

Usage

To include the TCP endpoint, add the following line of code in the Startup.ConfigureServices method:

using Microsoft.Extensions.DependencyInjection;using Microsoft.Extensions.Diagnostics.HealthChecks;
public class Startup{    public void ConfigureServices(IServiceCollection services)    {        // Add TCP health probe without extra health checks.        services.AddTcpHealthProbes("MyConfigurationKeyToTcpHealthPort");
        // Or, add your extra health checks in a configuration delegate.        services.AddTcpHealthProbes(            "MyConfigurationKeyToTcpHealthPort",            configureHealthChecks: healthBuilder =>             {                healthBuilder.AddCheck("Example", () => HealthCheckResult.Healthy("Example is OK!"), tags: new[] { "example" })            });    }}

Configuration

The TCP probe allows several additional configuration options.

using Microsoft.Extensions.DependencyInjection;
public class Startup{    public void ConfigureServices(IServiceCollection services)    {        // Add TCP health probe with or without extra health checks.        services.AddTcpHealthProbes(            "MyConfigurationKeyToTcpHealthPort",            configureTcpListenerOptions: options =>            {                // Configure the configuration key on which the health report is exposed.                options.TcpPortConfigurationKey = "MyConfigurationKey";
                // Configure how the health report should be serialized.                options.HealthReportSerializer = new MyHealthReportSerializer();
                // Configure how the health report status should affect the TCP probe's availability.                // When set to `true`, unhealthy health reports will result in rejecting of TCP client connection attempts.                // When set to `false` (default), TCP client connection attempts will be accepted but the returned health report will have a unhealthy health status.                options.RejectTcpConnectionWhenUnhealthy = true;            },            configureHealthCheckPublisherOptions: options =>            {                // Configures additional options regarding how fast or slow changes in the health report should affect the TCP probe's availability.                // When the RejectTcpConnectionWhenUnhealthy is set to `true`.
                // The initial delay after the application starts with monitoring the health report changes.                options.Delay = TimeSpan.Zero;
                // The interval in which the health report is monitored for changes.                options.Period = TimeSpan.FromSeconds(5);
                // See https://docs.microsoft.com/en-us/dotnet/api/microsoft.extensions.diagnostics.healthchecks.healthcheckpublisheroptions?view=dotnet-plat-ext-5.0 for more information.            });    }}
using Arcus.Messaging.Health;using Microsoft.Extensions.Diagnostics.HealthChecks;
public class MyHealthReportSerializer : IHealthReportSerializer{    public byte[] Serialize(HealthReport healthReport)    {        return Array.Empty<byte>();    }}

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