public async Task Invoke(HttpContext context)
{
if (context.Request.Path.HasValue && context.Request.Path.StartsWithSegments(FhirServerApplicationBuilderExtensions.HealthCheckPath, System.StringComparison.InvariantCultureIgnoreCase))
{
// Don't emit events for health check
await _next(context);
return;
}
var apiNotification = new ApiResponseNotification();
using (var timer = _logger.BeginTimedScope("ApiNotificationMiddleware") as ActionTimer)
{
try
{
await _next(context);
}
finally
{
apiNotification.Latency = timer.GetElapsedTime();
try
{
IFhirRequestContext fhirRequestContext = _fhirRequestContextAccessor.FhirRequestContext;
// For now, we will only emit metrics for audited actions (e.g., metadata will not emit metrics).
if (fhirRequestContext?.AuditEventType != null)
{
apiNotification.Authentication = fhirRequestContext.Principal?.Identity.AuthenticationType;
apiNotification.FhirOperation = fhirRequestContext.AuditEventType;
apiNotification.Protocol = context.Request.Scheme;
apiNotification.ResourceType = fhirRequestContext.ResourceType;
apiNotification.StatusCode = (HttpStatusCode)context.Response.StatusCode;
await _mediator.Publish(apiNotification, CancellationToken.None);
if (fhirRequestContext.StorageRequestMetrics != null)
{
await _mediator.Publish(fhirRequestContext.StorageRequestMetrics, CancellationToken.None);
}
}
}
catch (Exception e)
{
// Failures in publishing API notifications should not cause the API to return an error.
_logger.LogCritical(e, "Failure while publishing API notification.");
}
}
}
}
protected virtual async Task PublishNotificationAsync(HttpContext context, RequestDelegate next)
{
var apiNotification = new ApiResponseNotification();
using (var timer = _logger.BeginTimedScope(nameof(ApiNotificationMiddleware)) as ActionTimer)
{
try
{
await next(context);
}
finally
{
apiNotification.Latency = timer.GetElapsedTime();
try
{
IFhirRequestContext fhirRequestContext = _fhirRequestContextAccessor.FhirRequestContext;
// For now, we will only emit metrics for audited actions (e.g., metadata will not emit metrics).
// if (fhirRequestContext?.AuditEventType != null)
// {
apiNotification.Authentication = fhirRequestContext.Principal?.Identity.AuthenticationType;
apiNotification.FhirOperation = fhirRequestContext.AuditEventType;
apiNotification.Protocol = context.Request.Scheme;
apiNotification.ResourceType = fhirRequestContext.ResourceType;
apiNotification.StatusCode = (HttpStatusCode)context.Response.StatusCode;
await _mediator.Publish(apiNotification, CancellationToken.None);
// }
}
catch (Exception e)
{
// Failures in publishing API notifications should not cause the API to return an error.
_logger.LogCritical(e, "Failure while publishing API notification.");
}
}
}
}
