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using Azure.Monitor.OpenTelemetry.AspNetCore;

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Diagnostics.HealthChecks;

using Microsoft.Extensions.DependencyInjection;

using Microsoft.Extensions.Diagnostics.HealthChecks;

using Microsoft.Extensions.Hosting;

using Microsoft.Extensions.Logging;

using OpenTelemetry;

using OpenTelemetry.Exporter;

using OpenTelemetry.Logs;

using OpenTelemetry.Metrics;

using OpenTelemetry.Resources;

using OpenTelemetry.Trace;

namespace ControlR.Web.ServiceDefaults;

// Adds common .NET Aspire services: service discovery, resilience, health checks, and OpenTelemetry.

// This project should be referenced by each service project in your solution.

// To learn more about using this project, see https://aka.ms/dotnet/aspire/service-defaults

public static class Extensions

{

public static IHostApplicationBuilder AddDefaultHealthChecks(this IHostApplicationBuilder builder)

{

builder.Services

.AddHealthChecks()

// Add a default liveness check to ensure app is responsive

.AddCheck("self", () => HealthCheckResult.Healthy(), ["live"]);

return builder;

}

public static IHostApplicationBuilder AddServiceDefaults(

this IHostApplicationBuilder builder,

string serviceName,

string? hostId = null,

bool useServiceDiscovery = false,

bool useResilience = false,

Action<OpenTelemetryLoggerOptions>? configureLogging = null,

Action<MeterProviderBuilder>? configureMetrics = null,

Action<TracerProviderBuilder>? configureTracing = null)

{

builder.ConfigureOpenTelemetry(

serviceName,

hostId,

configureLogging,

configureMetrics,

configureTracing);

builder.AddDefaultHealthChecks();

if (useServiceDiscovery)

{

builder.Services.AddServiceDiscovery();

}

builder.Services.ConfigureHttpClientDefaults(http =>

{

if (useResilience)

{

// Turn on resilience

http.AddStandardResilienceHandler();

}

if (useServiceDiscovery)

{

// Turn on service discovery

http.AddServiceDiscovery();

}

});

return builder;

}

public static IHostApplicationBuilder ConfigureOpenTelemetry(

this IHostApplicationBuilder builder,

string serviceName,

string? hostId = null,

Action<OpenTelemetryLoggerOptions>? configureLogging = null,

Action<MeterProviderBuilder>? configureMetrics = null,

Action<TracerProviderBuilder>? configureTracing = null)

{

builder.Logging.AddOpenTelemetry(logging =>

{

var resourceBuilder = ResourceBuilder.CreateDefault();

resourceBuilder.AddService(

serviceName: serviceName,

serviceNamespace: "controlr");

if (hostId is not null)

{

resourceBuilder.AddAttributes([new KeyValuePair<string, object>("host.id", hostId)]);

}

logging.IncludeFormattedMessage = true;

logging.IncludeScopes = true;

logging.ParseStateValues = true;

logging.SetResourceBuilder(resourceBuilder);

configureLogging?.Invoke(logging);

});

builder.Services.AddOpenTelemetry()

.ConfigureResource(resourceBuilder =>

{

resourceBuilder.AddService(

serviceName: serviceName,

serviceNamespace: "controlr");

if (hostId is not null)

{

resourceBuilder.AddAttributes([new KeyValuePair<string, object>("host.id", hostId)]);

}

})

.WithMetrics(metrics =>

{

metrics

.AddAspNetCoreInstrumentation()

.AddHttpClientInstrumentation()

.AddRuntimeInstrumentation();

configureMetrics?.Invoke(metrics);

})

.WithTracing(tracing =>

{

tracing

.AddAspNetCoreInstrumentation(options =>

{

options.Filter = httpContext =>

{

return httpContext.Request.Path.Value?.StartsWith("/health") != true;

};

})

.AddHttpClientInstrumentation(options =>

{

options.FilterHttpWebRequest = request =>

{

return !request.RequestUri.PathAndQuery.StartsWith("/health");

};

});

configureTracing?.Invoke(tracing);

});

builder.AddOpenTelemetryExporters();

return builder;

}

public static WebApplication MapDefaultEndpoints(this WebApplication app)

{

// All health checks must pass for app to be considered ready to accept traffic after starting

app

.MapHealthChecks("/health")

.WithRequestTimeout(TimeSpan.FromSeconds(5))

.CacheOutput(policy => { policy.Expire(TimeSpan.FromSeconds(5)); });

// Only health checks tagged with the "live" tag must pass for app to be considered alive

app

.MapHealthChecks("/alive", new HealthCheckOptions

{

Predicate = r => r.Tags.Contains("live")

})

.WithRequestTimeout(TimeSpan.FromSeconds(5))

.CacheOutput(policy => { policy.Expire(TimeSpan.FromSeconds(5)); });

return app;

}

private static IHostApplicationBuilder AddOpenTelemetryExporters(

this IHostApplicationBuilder builder)

{

// The orchestrator-provided endpoint wins. The Aspire AppHost sets OTEL_EXPORTER_OTLP_ENDPOINT

// to its managed dashboard, while OTLP_ENDPOINT_URL is the checked-in default for compose runs.

var otlpEndpoint = builder.Configuration["OTEL_EXPORTER_OTLP_ENDPOINT"];

if (string.IsNullOrWhiteSpace(otlpEndpoint))

{

otlpEndpoint = builder.Configuration["OTLP_ENDPOINT_URL"];

}

var azureMonitorConnectionString = builder.Configuration["AzureMonitor:ConnectionString"];

if (Uri.TryCreate(otlpEndpoint, UriKind.Absolute, out var otlpUri))

{

builder.Services

.AddOpenTelemetry()

.UseOtlpExporter(OtlpExportProtocol.Grpc, otlpUri);

}

if (!string.IsNullOrWhiteSpace(azureMonitorConnectionString))

{

builder.Services

.AddOpenTelemetry()

.UseAzureMonitor(options => { options.ConnectionString = azureMonitorConnectionString; });

}

return builder;

}

}