public async Task Invoke(HttpContext httpContext)
{
if (httpContext.Request.Path.HasValue && httpContext.Request.Path.Value == "/metrics")
{
_logger.LogTrace($"{DateTime.Now:o} - Start scraping");
var status = 1;
try
{
//todo: validate settings
Stopwatch sw = new Stopwatch();
sw.Start();
var gaugeModels = new List <GaugeModel>();
if (_serviceBusNamespace == null)
{
var azureCredentials = SdkContext.AzureCredentialsFactory.FromServicePrincipal(_config.Value.ClientId, _config.Value.ClientSecret, _config.Value.TenantId, AzureEnvironment.AzureGlobalCloud);
var serviceBusManager = ServiceBusManager.Authenticate(azureCredentials, _config.Value.SubscriptionId);
_serviceBusNamespace = serviceBusManager.Namespaces.GetByResourceGroup(_config.Value.ResourceGroupName, _config.Value.ResourceName);
}
gaugeModels.AddRange(_queueService.CreateMetricsAsync(_serviceBusNamespace).GetAwaiter().GetResult());
gaugeModels.AddRange(_topicService.CreateMetricsAsync(_serviceBusNamespace).GetAwaiter().GetResult());
gaugeModels.AddRange(_subscriptionService.CreateMetricsAsync(_serviceBusNamespace).GetAwaiter().GetResult());
gaugeModels.Add(new GaugeModel()
{
Name = "scrape_duration_milliseconds",
Value = (sw.ElapsedMilliseconds),
Help = "The duration of the scrape in seconds",
});
foreach (var gaugeModel in gaugeModels)
{
var gauge = Metrics.CreateGauge(gaugeModel.Name, gaugeModel.Help, new GaugeConfiguration()
{
LabelNames = gaugeModel.Labels
});
gauge.WithLabels(gaugeModel.LabelValues).Set(gaugeModel.Value);
}
}
catch (Exception e)
{
status = 0;
_logger.LogError($"{DateTime.Now:o} - {e.Message}");
}
finally
{
var gauge = Metrics.CreateGauge("azureservicebusexporter_up",
"The status if the scrape was successful", new GaugeConfiguration());
gauge.Set(status);
_logger.LogTrace($"{DateTime.Now:o} - End scraping");
}
}
await _next.Invoke(httpContext);
}