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Fix System.Net.Sockets telemetry (#42726)
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@MihaZupan
MihaZupan authored Sep 25, 2020
1 parent e79a543 commit c5a3f49
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Showing 7 changed files with 723 additions and 222 deletions.
109 changes: 55 additions & 54 deletions src/libraries/Common/tests/System/Diagnostics/Tracing/TestEventListener.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -9,90 +9,91 @@ namespace System.Diagnostics.Tracing
/// <summary>Simple event listener than invokes a callback for each event received.</summary>
internal sealed class TestEventListener : EventListener
{
private readonly string _targetSourceName;
private readonly Guid _targetSourceGuid;
private readonly EventLevel _level;
private class Settings
{
public EventLevel Level;
public EventKeywords Keywords;
}

private readonly Dictionary<string, Settings> _names = new Dictionary<string, Settings>();
private readonly Dictionary<Guid, Settings> _guids = new Dictionary<Guid, Settings>();

private readonly double? _eventCounterInterval;

private Action<EventWrittenEventArgs> _eventWritten;
private List<EventSource> _tmpEventSourceList = new List<EventSource>();
private readonly List<EventSource> _eventSourceList = new List<EventSource>();

public TestEventListener(string targetSourceName, EventLevel level, double? eventCounterInterval = null)
{
// Store the arguments
_targetSourceName = targetSourceName;
_level = level;
_eventCounterInterval = eventCounterInterval;

LoadSourceList();
AddSource(targetSourceName, level);
}

public TestEventListener(Guid targetSourceGuid, EventLevel level, double? eventCounterInterval = null)
{
// Store the arguments
_targetSourceGuid = targetSourceGuid;
_level = level;
_eventCounterInterval = eventCounterInterval;

LoadSourceList();
AddSource(targetSourceGuid, level);
}

private void LoadSourceList()
public void AddSource(string name, EventLevel level, EventKeywords keywords = EventKeywords.All) =>
AddSource(name, null, level, keywords);

public void AddSource(Guid guid, EventLevel level, EventKeywords keywords = EventKeywords.All) =>
AddSource(null, guid, level, keywords);

private void AddSource(string name, Guid? guid, EventLevel level, EventKeywords keywords)
{
// The base constructor, which is called before this constructor,
// will invoke the virtual OnEventSourceCreated method for each
// existing EventSource, which means OnEventSourceCreated will be
// called before _targetSourceGuid and _level have been set. As such,
// we store a temporary list that just exists from the moment this instance
// is created (instance field initializers run before the base constructor)
// and until we finish construction... in that window, OnEventSourceCreated
// will store the sources into the list rather than try to enable them directly,
// and then here we can enumerate that list, then clear it out.
List<EventSource> sources;
lock (_tmpEventSourceList)
lock (_eventSourceList)
{
sources = _tmpEventSourceList;
_tmpEventSourceList = null;
}
foreach (EventSource source in sources)
{
EnableSourceIfMatch(source);
var settings = new Settings()
{
Level = level,
Keywords = keywords
};

if (name is not null)
_names.Add(name, settings);

if (guid.HasValue)
_guids.Add(guid.Value, settings);

foreach (EventSource source in _eventSourceList)
{
if (name == source.Name || guid == source.Guid)
{
EnableEventSource(source, level, keywords);
}
}
}
}

public void AddActivityTracking() =>
AddSource("System.Threading.Tasks.TplEventSource", EventLevel.Informational, (EventKeywords)0x80 /* TasksFlowActivityIds */);

protected override void OnEventSourceCreated(EventSource eventSource)
{
List<EventSource> tmp = _tmpEventSourceList;
if (tmp != null)
lock (_eventSourceList)
{
lock (tmp)
_eventSourceList.Add(eventSource);

if (_names.TryGetValue(eventSource.Name, out Settings settings) ||
_guids.TryGetValue(eventSource.Guid, out settings))
{
if (_tmpEventSourceList != null)
{
_tmpEventSourceList.Add(eventSource);
return;
}
EnableEventSource(eventSource, settings.Level, settings.Keywords);
}
}

EnableSourceIfMatch(eventSource);
}

private void EnableSourceIfMatch(EventSource source)
private void EnableEventSource(EventSource source, EventLevel level, EventKeywords keywords)
{
if (source.Name.Equals(_targetSourceName) ||
source.Guid.Equals(_targetSourceGuid))
var args = new Dictionary<string, string>();

if (_eventCounterInterval != null)
{
if (_eventCounterInterval != null)
{
var args = new Dictionary<string, string> { { "EventCounterIntervalSec", _eventCounterInterval?.ToString() } };
EnableEvents(source, _level, EventKeywords.All, args);
}
else
{
EnableEvents(source, _level);
}
args.Add("EventCounterIntervalSec", _eventCounterInterval.ToString());
}

EnableEvents(source, level, keywords, args);
}

public void RunWithCallback(Action<EventWrittenEventArgs> handler, Action body)
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48 changes: 20 additions & 28 deletions src/libraries/System.Net.NameResolution/src/System/Net/Dns.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -466,34 +466,9 @@ private static Task GetHostEntryOrAddressesCoreAsync(string hostName, bool justR

if (NameResolutionTelemetry.Log.IsEnabled())
{
ValueStopwatch stopwatch = NameResolutionTelemetry.Log.BeforeResolution(hostName);

Task coreTask;
try
{
coreTask = NameResolutionPal.GetAddrInfoAsync(hostName, justAddresses);
}
catch when (LogFailure(stopwatch))
{
Debug.Fail("LogFailure should return false");
throw;
}

coreTask.ContinueWith(
(task, state) =>
{
NameResolutionTelemetry.Log.AfterResolution(
stopwatch: (ValueStopwatch)state!,
successful: task.IsCompletedSuccessfully);
},
state: stopwatch,
cancellationToken: default,
TaskContinuationOptions.ExecuteSynchronously,
TaskScheduler.Default);

// coreTask is not actually a base Task, but Task<IPHostEntry> / Task<IPAddress[]>
// We have to return it and not the continuation
return coreTask;
return justAddresses
? (Task)GetAddrInfoWithTelemetryAsync<IPAddress[]>(hostName, justAddresses)
: (Task)GetAddrInfoWithTelemetryAsync<IPHostEntry>(hostName, justAddresses);
}
else
{
Expand All @@ -506,6 +481,23 @@ private static Task GetHostEntryOrAddressesCoreAsync(string hostName, bool justR
RunAsync(s => GetHostEntryCore((string)s), hostName);
}

private static async Task<T> GetAddrInfoWithTelemetryAsync<T>(string hostName, bool justAddresses)
where T : class
{
ValueStopwatch stopwatch = NameResolutionTelemetry.Log.BeforeResolution(hostName);

T? result = null;
try
{
result = await ((Task<T>)NameResolutionPal.GetAddrInfoAsync(hostName, justAddresses)).ConfigureAwait(false);
return result;
}
finally
{
NameResolutionTelemetry.Log.AfterResolution(stopwatch, successful: result is not null);
}
}

private static Task<TResult> RunAsync<TResult>(Func<object, TResult> func, object arg) =>
Task.Factory.StartNew(func!, arg, CancellationToken.None, TaskCreationOptions.DenyChildAttach, TaskScheduler.Default);

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