private void StopTimerAndReport(IInvocation invocation, Exception exception = null)
{
if (!StatsdClientWrapper.IsEnabled)
{
return;
}
var stopwatch = _stopWatchThreadLocal.Value[invocation.Method.MethodHandle];
var elapsedMilliseconds = (int)stopwatch.ElapsedMilliseconds;
stopwatch.Reset();
var actionName = invocation.Method.Name.ToLower();
var metricName = GetMetricName(invocation, actionName, exception);
StatsdClientWrapper.Timer(metricName, elapsedMilliseconds);
StatsdClientWrapper.Counter(metricName);
}
public void Dispose()
{
if (string.IsNullOrEmpty(ActionName))
{
return;
}
_stopwatch.Stop();
//=======================================
// .NET has a technique to detect whether an exception has been thrown from within a finally:
// http://stackoverflow.com/questions/2830073/detecting-a-dispose-from-an-exception-inside-using-block
// (Marshal.GetExceptionPointers() != IntPtr.Zero || Marshal.GetExceptionCode() != 0);
// however, this is not yet implemented in Mono
// http://www.go-mono.com/momareports/apis/System.Int32%20System.Runtime.InteropServices.Marshal;;GetExceptionCode%28%29
// so: caller can manage this property manually in a try-catch nested witin the attribute, if desired
//=======================================
var metricName = CommonHelpers.MetricName(ExceptionThrown, ActionName);
StatsdClientWrapper.Timer(metricName, (int)_stopwatch.ElapsedMilliseconds);
StatsdClientWrapper.Counter(metricName);
}
public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
{
try
{
if (!StatsdClientWrapper.IsEnabled)
{
return;
}
var stopwatch = actionExecutedContext.Request.Properties[StopwatchKey] as Stopwatch;
if (stopwatch == null)
{
return;
}
var elapsedMilliseconds = (int)stopwatch.ElapsedMilliseconds;
stopwatch.Reset();
var actionName = string.IsNullOrEmpty(SuppliedActionName)
? actionExecutedContext.ActionContext.ActionDescriptor.ActionName
: SuppliedActionName;
var apiVersion = GetApiVersion(actionExecutedContext);
var httpVerb = actionExecutedContext.Request.Method.ToString();
int statusCode = 0;
var otEndpoint = string.Format("{0}-{1}", actionName, apiVersion).ToLower();
if (actionExecutedContext.Response != null)
{
// controller returns HttpResponseMessage or threw a HttpResponseException
statusCode = (int)actionExecutedContext.Response.StatusCode;
// Look for endpoint name in the response headers, if one exists we will use it to
// publish metircs. If not will default to action name and will set the header
// value as such for upstream services.
IEnumerable <string> headerValues;
if (actionExecutedContext.Response.Headers.TryGetValues(StatsdConstants.OtEndpoint, out headerValues))
{
otEndpoint = string.Format("{0}-{1}", headerValues.FirstOrDefault() ?? actionName, apiVersion).ToLower();
}
else
{
actionExecutedContext.Response.Headers.Add(StatsdConstants.OtEndpoint, otEndpoint);
}
}
else if (actionExecutedContext.Exception != null)
{
// controllers threw exception that is not typeof(HttpResponseException)
if (CommonHelpers.ExceptionToStatusCode != null)
{
var statusCodeEnum = CommonHelpers.ExceptionToStatusCode(actionExecutedContext.Exception,
actionExecutedContext);
statusCode = (int)statusCodeEnum;
actionExecutedContext.Response = actionExecutedContext.Request.CreateResponse(statusCodeEnum);
actionExecutedContext.Response.Headers.Add(StatsdConstants.OtEndpoint, otEndpoint);
}
}
var status = CommonHelpers.GetHighlevelStatus(IsSuccessStatusCode(statusCode));
// not being able to read status code will result in status code being set to undefined
var statusCodeString = statusCode == 0
? StatsdConstants.Undefined
: statusCode.ToString(CultureInfo.InvariantCulture);
var metricName = string.Format(
"{0}.{1}.{2}.{3}.{4}.{5}",
StatsdConstants.HttpRequestIn,
GetReferringService(actionExecutedContext),
otEndpoint,
status,
httpVerb,
statusCodeString).Replace('_', '-').ToLower();
StatsdClientWrapper.Timer(metricName, elapsedMilliseconds);
StatsdClientWrapper.Counter(metricName);
EnrichResponseHeaders(actionExecutedContext);
}
finally
{
base.OnActionExecuted(actionExecutedContext);
}
}