public string Health([FromServices] IManagedTracer tracer)
{
string message = "/_ah/health";
using (tracer.StartSpan(message))
{
Thread.Sleep(10);
}
return(message);
}
public async Task <string> CreateFirstSpan(string id)
{
string createNoSpanUri = $"/Propagation/{nameof(CreateNoSpan)}/{id}";
string createSecondSpanUri = $"/Propagation/{nameof(CreatesSecondSpan)}/{id}";
string message = EntryData.GetMessage(nameof(CreateFirstSpan), id);
// This will guarantee that our requests are to the first server instead
// of to a published app in localhost.
using (_propagatingHandler.InnerHandler = FirstCallServer.CreateHandler())
using (var client = new HttpClient(_propagatingHandler, false))
using (_tracer.StartSpan(message))
{
client.BaseAddress = new Uri("http://localhost");
await client.GetAsync(createNoSpanUri);
await client.GetAsync(createSecondSpanUri);
}
return(message);
}
/// <summary>Traces a 10ms sleep.</summary>
public string Trace(string id, [FromServices] IManagedTracer tracer)
{
string message = EntryData.GetMessage(nameof(Trace), id);
using (tracer.StartSpan(message))
{
Thread.Sleep(10);
}
return(message);
}
/// <summary>Traces a 10ms sleep and throws an exception.</summary>
public string ThrowException(string id, [FromServices] IManagedTracer tracer)
{
// Add a span with the test id to allow for the trace to be found.
string message = GetMessage(nameof(ThrowException), id);
tracer.StartSpan(message);
Thread.Sleep(10);
tracer.EndSpan();
throw new DivideByZeroException();
}
/// <summary>Traces a 10ms sleep and adds a stacktrace.</summary>
public string TraceStackTrace(string id, [FromServices] IManagedTracer tracer)
{
string message = GetMessage(nameof(TraceStackTrace), id);
tracer.StartSpan(message);
Thread.Sleep(10);
tracer.SetStackTrace(CreateStackTrace());
tracer.EndSpan();
return(message);
}
// This incoming HTTP request should be captured by Trace.
public IActionResult Index([FromServices] IManagedTracer tracer)
{
using (tracer.StartSpan(nameof(Index)))
{
var traceHeaderHandler = new TraceHeaderPropagatingHandler(() => tracer);
var response = TraceOutgoing(traceHeaderHandler);
ViewData["text"] = response.Result.ToString();
return(View());
}
}
public async Task <string> TraceOutgoing(string id, [FromServices] IManagedTracer tracer, [FromServices] TraceHeaderPropagatingHandler propagatingHandler)
{
string message = EntryData.GetMessage(nameof(TraceOutgoing), id);
using (tracer.StartSpan(message))
using (var httpClient = new HttpClient(propagatingHandler))
{
await httpClient.GetAsync("https://google.com/");
}
return(message);
}
public async Task <string> TraceOutgoingClientFactory(string id, [FromServices] IManagedTracer tracer, [FromServices] IHttpClientFactory httpClientFactory)
{
string message = EntryData.GetMessage(nameof(TraceOutgoingClientFactory), id);
using (tracer.StartSpan(message))
{
var httpClient = httpClientFactory.CreateClient("google");
await httpClient.GetAsync("");
}
return(message);
}
/// <summary>Traces a 10ms sleep and adds an annotation.</summary>
public string TraceLabels(string id, [FromServices] IManagedTracer tracer)
{
string message = GetMessage(nameof(TraceLabels), id);
tracer.StartSpan(message);
Thread.Sleep(10);
tracer.AnnotateSpan(new Dictionary <string, string> {
{ Label, LabelValue }
});
tracer.EndSpan();
return(message);
}
/// <summary>
/// Handles received HTTP request. For details of the expected request,
/// please see Dialogflow fulfillment doc: https://dialogflow.com/docs/fulfillment
/// </summary>
/// <param name="httpRequest">HTTP request</param>
/// <returns>Webhook response</returns>
public async Task <WebhookResponse> HandleRequest(HttpRequest httpRequest)
{
using (_tracer.StartSpan(nameof(DialogflowApp)))
{
WebhookRequest request;
using (var reader = new StreamReader(httpRequest.Body))
{
request = jsonParser.Parse <WebhookRequest>(reader);
}
_logger.LogInformation($"Intent: '{request.QueryResult.Intent.DisplayName}', QueryText: '{request.QueryResult.QueryText}'");
var conversation = GetOrCreateConversation(request.Session);
using (_tracer.StartSpan("Conversation"))
{
return(await conversation.HandleAsync(request));
}
}
}
/// <summary>Traces a 10ms sleep and adds an annotation.</summary>
public string TraceLabels(string id, [FromServices] IManagedTracer tracer)
{
string message = EntryData.GetMessage(nameof(TraceLabels), id);
using (tracer.StartSpan(message))
{
Thread.Sleep(10);
tracer.AnnotateSpan(new Dictionary <string, string> {
{ TraceEntryData.TraceLabel, TraceEntryData.TraceLabelValue }
});
return(message);
}
}
public async Task TraceIncomingAsync()
{
IHost host = null;
// Hides that we use different classes so that we can have multiple CreateHostBuilder methods.
Func <IHostBuilder> CreateHostBuilder = DefaultHostBuilder.CreateHostBuilder;
try
{
// Sample: Start
host = CreateHostBuilder().Build();
await host.StartAsync();
// End sample
object request = null;
// Sample: IncomingContext
ITraceContext traceContext = GetTraceContextFromIncomingRequest(request);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
// End sample
// Let's just start a span with the test ID so we can find it faster.
// But we don't show this in sample code.
using (tracer.StartSpan(_testId))
{
// Sample: Trace
IManagedTracer currentTracer = host.Services.GetRequiredService <IManagedTracer>();
using (currentTracer.StartSpan("testing_tracing"))
{
Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app");
}
// End sample
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "testing_tracing");
Assert.Equal(traceContext.TraceId, trace.TraceId);
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}
/// <summary>
/// Creates a <see cref="TraceHeaderPropagatingHandler"/> and traces the sending of a
/// GET request to the given Uri. The trace is wrapped in a parent span.
/// </summary>
/// <param name="rootSpanName">The name of the root span that will wrap the span
/// that traces the request.</param>
/// <param name="uri">The Uri to request.</param>
/// <param name="exceptionExpected">True if an exception from the request to the Uri is expected.</param>
private async Task TraceOutGoingRequest(string rootSpanName, string uri, bool exceptionExpected)
{
using (_tracer.StartSpan(rootSpanName))
using (var traceHeaderHandler = new TraceHeaderPropagatingHandler(() => _tracer))
using (var httpClient = new HttpClient(traceHeaderHandler))
{
try
{
await httpClient.GetAsync(uri);
Assert.False(exceptionExpected);
}
catch (Exception e) when(exceptionExpected && !(e is Xunit.Sdk.XunitException))
{
}
}
}
public async Task TraceAsync()
{
// Naming it like an instance variable so that it looks like that on sample code.
IHost _host = null;
try
{
// Sample: Start
_host = CreateHostBuilder().Build();
await _host.StartAsync();
// End sample
// Sample: IncomingContext
ITraceContext traceContext = GetTraceContextFromIncomingRequest();
var tracerFactory = _host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
// End sample
// Let's just start a span with the test ID so we can find it faster.
// But we don't show this in sample code.
using (tracer.StartSpan(_testId))
{
// Sample: Trace
IManagedTracer currentTracer = _host.Services.GetRequiredService <IManagedTracer>();
using (currentTracer.StartSpan("standalone_tracing"))
{
Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app");
}
// End sample
}
var trace = s_polling.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "standalone_tracing");
Assert.Equal(traceContext.TraceId, trace.TraceId);
}
finally
{
if (_host != null)
{
await _host.StopAsync();
}
}
}
public async Task TraceOutgoingAsync()
{
IHost host = null;
try
{
host = OutgoingHostBuilder.CreateHostBuilder().Build();
await host.StartAsync();
ITraceContext traceContext = new SimpleTraceContext(null, null, true);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
// Let's just start a span with the test ID so we can find it faster.
// But we don't show this in sample code.
using (tracer.StartSpan(_testId))
{
// Sample: TraceOutgoingClientFactory
IHttpClientFactory clientFactory = host.Services.GetRequiredService <IHttpClientFactory>();
var httpClient = clientFactory.CreateClient("tracesOutgoing");
// Any code that makes outgoing requests.
var response = await httpClient.GetAsync("http://weather.com/");
// End sample
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "http://weather.com/");
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}
public async Task TraceSingleAsync()
{
IHost host = null;
try
{
host = TroubleshootingHostBuilder.CreateHostBuilder().Build();
await host.StartAsync();
// Sample: SingleContext
ITraceContext traceContext = new SimpleTraceContext(null, null, true);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
// End sample
// Let's just start a span with the test ID so we can find it faster.
// But we don't show this in sample code.
using (tracer.StartSpan(_testId))
{
// Sample: RunIn
IManagedTracer currentTracer = host.Services.GetRequiredService <IManagedTracer>();
currentTracer.RunInSpan(
() => Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app"),
"testing_tracing");
// End sample
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "testing_tracing");
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}
/// <summary>
/// Handle a DialogFlow conversation request.
/// An instance of this class handles just one conversation,
/// which is tracked external to this class, using the DialogFlow sessionID.
/// </summary>
/// <param name="req">Webhook request</param>
/// <returns>Webhook response</returns>
public async Task <WebhookResponse> HandleAsync(WebhookRequest req)
{
// Use reflection to find the handler method for the requested DialogFlow intent
var intentName = req.QueryResult.Intent.DisplayName;
var handler = FindHandler(intentName);
if (handler == null)
{
return(new WebhookResponse
{
FulfillmentText = $"Sorry, no handler found for intent: {intentName}"
});
}
try
{
using (_tracer.StartSpan(intentName))
{
// Call the sync handler, if there is one. If not, call the async handler.
// Otherwise, it's an error.
return(handler.Handle(req) ??
await handler.HandleAsync(req) ??
new WebhookResponse
{
FulfillmentText = "Error. Handler did not return a valid response."
});
}
}
catch (Exception e) when(req.QueryResult.Intent.DisplayName != "exception.throw")
{
_exceptionLogger.Log(e);
var msg = (e as GoogleApiException)?.Error.Message ?? e.Message;
return(new WebhookResponse
{
FulfillmentText = $"Sorry, there's a problem: {msg}"
});
}
}
public async Task TraceSingleAsync()
{
IHost host = null;
// Hides that we use different classes so that we can have multiple CreateHostBuilder methods.
Func <IHostBuilder> CreateHostBuilder = DefaultHostBuilder.CreateHostBuilder;
try
{
// Sample: Start
host = CreateHostBuilder().Build();
await host.StartAsync();
// End sample
ITraceContext traceContext = new SimpleTraceContext(null, null, true);
var tracerFactory = host.Services.GetRequiredService <Func <ITraceContext, IManagedTracer> >();
IManagedTracer tracer = tracerFactory(traceContext);
ContextTracerManager.SetCurrentTracer(tracer);
using (tracer.StartSpan(_testId))
{
IManagedTracer currentTracer = host.Services.GetRequiredService <IManagedTracer>();
currentTracer.RunInSpan(
() => Console.WriteLine("Using Cloud Trace from a non ASP.NET Core app"),
"testing_tracing");
}
var trace = TraceEntryPolling.Default.GetTrace(_testId, _startTime);
TraceEntryVerifiers.AssertParentChildSpan(trace, _testId, "testing_tracing");
}
finally
{
if (host is object)
{
await host.StopAsync();
}
}
}
public async Task <IActionResult> PostAsync(
[FromBody] WeatherForecastModel model,
CancellationToken cancellationToken)
{
using (_tracer.StartSpan("save"))
{
try
{
//These two lines are for example
var traceHeaderHandler = new TraceHeaderPropagatingHandler(() => _tracer);
var response = TraceOutgoing(traceHeaderHandler);
await _storageLogic.SaveToFileAsync(model, cancellationToken);
return(Ok());
}
catch (Exception e)
{
_logger.LogError(e, "Service Error, attention!!!!");
return(StatusCode(StatusCodes.Status500InternalServerError,
e.Message));
}
}
}
