private DataPoint AssembleDataPoint(CounterConfig counter, ManagementObject result)
{
var instance = counter.Instance;
var counterName = counter.Counter;
string applicationPoolName = string.Empty;
var friendlyName = counter.Name;
var resultName = GetPropertyString(result, "Name");
var value = Convert.ToSingle(result[counterName]);
var processId = GetPropertyInt(result, "IDProcess");
if (processId.HasValue)
{
applicationPoolName = GetAppPoolByProcessId(processId);
}
// Prefer in order of ApplicationName, ResultName, Instance or just use empty string.
var instanceName =
!string.IsNullOrWhiteSpace(applicationPoolName)
? applicationPoolName
: !string.IsNullOrWhiteSpace(resultName)
? resultName
: !string.IsNullOrWhiteSpace(instance)
? instance
: string.Empty;
Log.DebugFormat("{0}/{1} ({2}): {3}", friendlyName, instanceName,
applicationPoolName, value);
if (!string.IsNullOrWhiteSpace(instanceName))
{
friendlyName = string.Concat(friendlyName, " - ", instanceName);
}
return new DataPoint(friendlyName, value, DateTime.UtcNow, _instanceId);
}
private static string BuildQueryString(CounterConfig counter)
{
var providerName = counter.Provider;
var categoryName = counter.Category;
var instance = counter.Instance;
var counterName = counter.Counter;
if (string.IsNullOrWhiteSpace(providerName) || string.IsNullOrWhiteSpace(categoryName) ||
string.IsNullOrWhiteSpace(counterName))
{
Log.ErrorFormat("Invalid Counter. Provider={0}, Category={1}, Name={2}", providerName, categoryName,
counterName);
return null;
}
var whereClause = string.Empty;
if (!string.IsNullOrWhiteSpace(counter.Instance))
{
whereClause = string.Format(" Where Name Like '{0}'", instance);
}
var queryString = string.Format("Select * from Win32_PerfFormattedData_{0}_{1}{2}",
providerName, categoryName, whereClause);
return queryString;
}
private List<DataPoint> GetDataPoints(CounterConfig counter)
{
if (counter == null) return null;
var queryString = BuildQueryString(counter);
if (queryString == null) return null;
var search = new ManagementObjectSearcher(Scope, new ObjectQuery(queryString));
var dataPoints = new List<DataPoint>();
try
{
var queryResults = search.Get();
var results = queryResults.Cast<ManagementObject>();
try
{
// ReSharper disable once PossibleMultipleEnumeration
Log.DebugFormat("Retrieved {0} results from '{1}'", results.Count(), queryString);
}
catch (ManagementException ex)
{
Log.Warn(string.Format("Unable to read results of '{0}'", queryString), ex);
return null;
}
// ReSharper disable once PossibleMultipleEnumeration
foreach (var result in results)
{
try
{
dataPoints.Add(AssembleDataPoint(counter, result));
}
catch (Exception ex)
{
Log.Error(string.Format("Exception while retrieving metric results. Query: {0}", queryString),
ex);
}
}
}
catch (Exception ex)
{
Log.Error(string.Format("Exception while polling metrics. Query: {0}", queryString), ex);
}
return dataPoints;
}