static IApplicationBuilder UseRequestMetricCore(this IApplicationBuilder app, Action <RequestMetricOptions> init)
{
var options = new RequestMetricOptions();
init(options);
app.UseMiddleware <RequestMetricMiddleware>(Options.Create(options));
return(app);
}
public RequestMetricMiddleware(
RequestDelegate next,
IOptions <RequestMetricOptions> options,
IMetricFactory <RequestMetricMiddleware> factory)
{
_next = next;
_options = options.Value;
var labels = new List <string>();
if (_options.IncludeStatusCode)
{
labels.Add("status_code");
}
if (_options.IncludeMethod)
{
labels.Add("method");
}
if (_options.IncludePath)
{
labels.Add("path");
}
if (_options.CustomLabels != null)
{
foreach (var customLabel in _options.CustomLabels)
{
labels.Add(customLabel.Key);
}
}
var helpTextEnd = string.Join(", ", labels);
_labelsCount = labels.Count;
_requestDurations = factory.CreateSummary(_options.RequestDurationMetricName, opts =>
{
opts.Help = DurationHelpText + helpTextEnd;
opts.LabelNames = labels;
if (_options.RequestDurationObjectives != null)
{
opts.Objectives = _options.RequestDurationObjectives;
}
});
}
