internal async Task OnResponseCompleted(HttpContext httpContext, IServerTiming serverTiming, IReadOnlyList <IServerTimingCallback> callbacks)
{
var metrics = serverTiming.GetMetrics();
var timingEvent = new ServerTimingEvent(httpContext, metrics);
var tasks = new Task[callbacks.Count];
for (var i = 0; i < callbacks.Count; i++)
{
tasks[i] = callbacks[i].OnServerTiming(timingEvent);
}
var aggregationTask = Task.WhenAll(tasks);
try
{
await aggregationTask;
}
// ReSharper disable once EmptyGeneralCatchClause
catch (Exception)
{
// AggregateException will be available below with exceptions from all tasks.
}
if (aggregationTask.Exception == null)
{
return;
}
var innerExceptions = aggregationTask.Exception.InnerExceptions;
// ReSharper disable once ForCanBeConvertedToForeach
for (var i = 0; i < innerExceptions.Count; i++)
{
_logger.LogError(innerExceptions[i], "Exception was thrown invoking Server Timing callback");
}
}
internal Task OnResponseStarting(HttpContext httpContext, IManualMetric totalMetric, IServerTiming serverTiming, RequestTimingOptions requestOptions)
{
totalMetric.Stop();
var metrics = serverTiming.GetMetrics();
if (_options.ValidateMetrics && httpContext.Response.StatusCode != 500)
{
// ReSharper disable once ForCanBeConvertedToForeach
for (var i = 0; i < metrics.Count; i++)
{
if (metrics[i] is IValidatableMetric validatableMetric)
{
if (!validatableMetric.Validate(out var message))
{
_logger.LogWarning(message);
}
}
}
}
if (!requestOptions.WriteHeader)
{
return(Task.CompletedTask);
}
if (!requestOptions.IncludeCustomMetrics)
{
metrics = new[] { (IMetric)totalMetric }
}
;
_headerWriter.WriteHeaders(httpContext.Response.Headers, requestOptions.IncludeDescriptions, metrics);
return(Task.CompletedTask);
}
