/// <summary>
/// Adds the needed services for Google Cloud Tracing. Used with <see cref="UseGoogleTrace"/>.
/// </summary>
/// <param name="services">The service collection. Cannot be null.</param>
/// <param name="setupAction">Action to set up options. Cannot be null.</param>
/// <remarks>
/// If <see cref="RetryOptions.ExceptionHandling"/> is set to <see cref="ExceptionHandling.Propagate"/>
/// and the <see cref="RequestDelegate"/> executed by this middleware throws ad exception and this
/// diagnostics library also throws an exception trying to report it and <see cref="AggregateException"/>
/// with both exceptions will be thrown. Otherwise only the exception from the <see cref="RequestDelegate"/>
/// will be thrown.
/// </remarks>
public static IServiceCollection AddGoogleTrace(
this IServiceCollection services, Action <TraceServiceOptions> setupAction)
{
GaxPreconditions.CheckNotNull(services, nameof(services));
GaxPreconditions.CheckNotNull(setupAction, nameof(setupAction));
var serviceOptions = new TraceServiceOptions();
setupAction(serviceOptions);
var client = serviceOptions.Client ?? TraceServiceClient.Create();
var options = serviceOptions.Options ?? TraceOptions.Create();
var traceFallbackPredicate = serviceOptions.TraceFallbackPredicate ?? TraceDecisionPredicate.Default;
var projectId = Project.GetAndCheckProjectId(serviceOptions.ProjectId);
var consumer = ManagedTracer.CreateConsumer(client, options);
var tracerFactory = ManagedTracer.CreateTracerFactory(projectId, consumer, options);
services.AddScoped(CreateTraceHeaderContext);
services.AddSingleton(tracerFactory);
// Only add the HttpContextAccessor if it's not already added.
// This is needed to get the `TraceHeaderContext`. See `CreateTraceHeaderContext`.
services.TryAddSingleton <IHttpContextAccessor, HttpContextAccessor>();
services.AddSingleton(ManagedTracer.CreateDelegatingTracer(() => ContextTracerManager.GetCurrentTracer()));
services.AddSingleton(new TraceHeaderPropagatingHandler(() => ContextTracerManager.GetCurrentTracer()));
return(services.AddSingleton(traceFallbackPredicate));
}
/// <summary>
/// Adds the needed services for Google Cloud Tracing. Used with <see cref="UseGoogleTrace"/>.
/// </summary>
/// <param name="services">The service collection. Must not be null.</param>
/// <param name="setupAction">Action to set up options. Must not be null.</param>
/// <remarks>
/// If <see cref="RetryOptions.ExceptionHandling"/> is set to <see cref="ExceptionHandling.Propagate"/>
/// and the <see cref="RequestDelegate"/> executed by this middleware throws ad exception and this
/// diagnostics library also throws an exception trying to report it and <see cref="AggregateException"/>
/// with both exceptions will be thrown. Otherwise only the exception from the <see cref="RequestDelegate"/>
/// will be thrown.
/// </remarks>
public static IServiceCollection AddGoogleTrace(
this IServiceCollection services, Action <TraceServiceOptions> setupAction)
{
GaxPreconditions.CheckNotNull(services, nameof(services));
GaxPreconditions.CheckNotNull(setupAction, nameof(setupAction));
var serviceOptions = new TraceServiceOptions();
setupAction(serviceOptions);
var client = serviceOptions.Client ?? TraceServiceClient.Create();
var options = serviceOptions.Options ?? TraceOptions.Create();
var traceFallbackPredicate = serviceOptions.TraceFallbackPredicate ?? TraceDecisionPredicate.Default;
var projectId = Project.GetAndCheckProjectId(serviceOptions.ProjectId);
var consumer = ManagedTracer.CreateConsumer(client, options);
var tracerFactory = ManagedTracer.CreateTracerFactory(projectId, consumer, options);
services.AddScoped(CreateTraceHeaderContext);
services.AddSingleton(tracerFactory);
services.AddHttpContextAccessor();
services.AddSingleton(ManagedTracer.CreateDelegatingTracer(ContextTracerManager.GetCurrentTracer));
// On .Net Standard 2.0 or higher, we can use the System.Net.Http.IHttpClientFactory defined in Microsoft.Extensions.Http,
// for which we need a DelagatingHandler with no InnerHandler set. This is the recommended way.
// It should be registered as follows.
services.AddTransient(sp => new UnchainedTraceHeaderPropagatingHandler(ContextTracerManager.GetCurrentTracer));
// This is to be used for explicitly creating an HttpClient instance. Valid for all platforms.
services.AddSingleton(new TraceHeaderPropagatingHandler(ContextTracerManager.GetCurrentTracer));
return(services.AddSingleton(traceFallbackPredicate));
}
public void CreateDelegatingTracer()
{
var mockTracer = new Mock <IManagedTracer>();
string traceId = Guid.NewGuid().ToString("N");
mockTracer.Setup(p => p.GetCurrentTraceId()).Returns(traceId);
var tracer = ManagedTracer.CreateDelegatingTracer(() => mockTracer.Object);
Assert.IsType <DelegatingTracer>(tracer);
Assert.Equal(traceId, tracer.GetCurrentTraceId());
mockTracer.Verify();
}
/// <summary>
/// Creates a singleton <see cref="IManagedTracer"/> that is a <see cref="DelegatingTracer"/>.
/// The <see cref="DelegatingTracer"/> will use an <see cref="IHttpContextAccessor"/> under the hood
/// to get the current tracer which is set by the <see cref="ContextTracerManager"/>.
/// </summary>
internal static IManagedTracer CreateManagedTracer(IServiceProvider provider)
{
var accessor = provider.GetServiceCheckNotNull <IHttpContextAccessor>();
return(ManagedTracer.CreateDelegatingTracer(() => ContextTracerManager.GetCurrentTracer(accessor)));
}