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SqlEventSourceListener.netfx.cs
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SqlEventSourceListener.netfx.cs
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// <copyright file="SqlEventSourceListener.netfx.cs" company="OpenTelemetry Authors">
// Copyright The OpenTelemetry Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// </copyright>
#if NETFRAMEWORK
using System;
using System.Diagnostics;
using System.Diagnostics.Tracing;
using OpenTelemetry.Trace;
namespace OpenTelemetry.Instrumentation.SqlClient.Implementation
{
/// <summary>
/// On .NET Framework, neither System.Data.SqlClient nor Microsoft.Data.SqlClient emit DiagnosticSource events.
/// Instead they use EventSource:
/// For System.Data.SqlClient see: <a href="https://github.com/microsoft/referencesource/blob/3b1eaf5203992df69de44c783a3eda37d3d4cd10/System.Data/System/Data/Common/SqlEventSource.cs#L29">reference source</a>.
/// For Microsoft.Data.SqlClient see: <a href="https://github.com/dotnet/SqlClient/blob/ac8bb3f9132e6c104dc3e307fe2d569daed0776f/src/Microsoft.Data.SqlClient/src/Microsoft/Data/SqlClient/SqlClientEventSource.cs#L15">SqlClientEventSource</a>.
///
/// We hook into these event sources and process their BeginExecute/EndExecute events.
/// </summary>
/// <remarks>
/// Note that before version 2.0.0, Microsoft.Data.SqlClient used "Microsoft-AdoNet-SystemData"
/// EventSource (same as System.Data.SqlClient), but since 2.0.0 has switched to "Microsoft.Data.SqlClient.EventSource".
///
/// Due to the limitation of the "Microsoft-AdoNet-SystemData", it is not possible to capture sql statement text
/// for CommandType.Text when using that EventSource. It only reports text for CommandType.StoredProcedure.
///
/// "Microsoft.Data.SqlClient.EventSource" doesn't have that issue.
/// </remarks>
internal class SqlEventSourceListener : EventListener
{
internal const string AdoNetEventSourceName = "Microsoft-AdoNet-SystemData";
internal const string MdsEventSourceName = "Microsoft.Data.SqlClient.EventSource";
internal const int BeginExecuteEventId = 1;
internal const int EndExecuteEventId = 2;
private readonly SqlClientInstrumentationOptions options;
private EventSource adoNetEventSource;
private EventSource mdsEventSource;
public SqlEventSourceListener(SqlClientInstrumentationOptions options = null)
{
this.options = options ?? new SqlClientInstrumentationOptions();
}
public override void Dispose()
{
if (this.adoNetEventSource != null)
{
this.DisableEvents(this.adoNetEventSource);
}
if (this.mdsEventSource != null)
{
this.DisableEvents(this.mdsEventSource);
}
base.Dispose();
}
protected override void OnEventSourceCreated(EventSource eventSource)
{
if (eventSource?.Name.StartsWith(AdoNetEventSourceName, StringComparison.Ordinal) == true)
{
this.adoNetEventSource = eventSource;
this.EnableEvents(eventSource, EventLevel.Informational, (EventKeywords)1);
}
else if (eventSource?.Name.StartsWith(MdsEventSourceName, StringComparison.Ordinal) == true)
{
this.mdsEventSource = eventSource;
this.EnableEvents(eventSource, EventLevel.Informational, (EventKeywords)1);
}
base.OnEventSourceCreated(eventSource);
}
protected override void OnEventWritten(EventWrittenEventArgs eventData)
{
try
{
if (eventData.EventId == BeginExecuteEventId)
{
this.OnBeginExecute(eventData);
}
else if (eventData.EventId == EndExecuteEventId)
{
this.OnEndExecute(eventData);
}
}
catch (Exception exc)
{
SqlClientInstrumentationEventSource.Log.UnknownErrorProcessingEvent(nameof(SqlEventSourceListener), nameof(this.OnEventWritten), exc);
}
}
private void OnBeginExecute(EventWrittenEventArgs eventData)
{
/*
Expected payload:
[0] -> ObjectId
[1] -> DataSource
[2] -> Database
[3] -> CommandText
Note:
- For "Microsoft-AdoNet-SystemData": [3] CommandText = (CommandType == CommandType.StoredProcedure ? CommandText : string.Empty;
- For "Microsoft.Data.SqlClient.EventSource": [3] CommandText = sqlCommand.CommandText (so it is set for all command types).
*/
if ((eventData?.Payload?.Count ?? 0) < 4)
{
SqlClientInstrumentationEventSource.Log.InvalidPayload(nameof(SqlEventSourceListener), nameof(this.OnBeginExecute));
return;
}
var activity = SqlActivitySourceHelper.ActivitySource.StartActivity(SqlActivitySourceHelper.ActivityName, ActivityKind.Client);
if (activity == null)
{
// There is no listener or it decided not to sample the current request.
return;
}
string databaseName = (string)eventData.Payload[2];
activity.DisplayName = databaseName;
if (activity.IsAllDataRequested)
{
activity.SetTag(SemanticConventions.AttributeDbSystem, SqlActivitySourceHelper.MicrosoftSqlServerDatabaseSystemName);
activity.SetTag(SemanticConventions.AttributeDbName, databaseName);
this.options.AddConnectionLevelDetailsToActivity((string)eventData.Payload[1], activity);
string commandText = (string)eventData.Payload[3];
if (!string.IsNullOrEmpty(commandText) && this.options.SetDbStatement)
{
activity.SetTag(SemanticConventions.AttributeDbStatement, commandText);
}
}
}
private void OnEndExecute(EventWrittenEventArgs eventData)
{
/*
Expected payload:
[0] -> ObjectId
[1] -> CompositeState bitmask (0b001 -> successFlag, 0b010 -> isSqlExceptionFlag , 0b100 -> synchronousFlag)
[2] -> SqlExceptionNumber
*/
if ((eventData?.Payload?.Count ?? 0) < 3)
{
SqlClientInstrumentationEventSource.Log.InvalidPayload(nameof(SqlEventSourceListener), nameof(this.OnEndExecute));
return;
}
var activity = Activity.Current;
if (activity?.Source != SqlActivitySourceHelper.ActivitySource)
{
return;
}
try
{
if (activity.IsAllDataRequested)
{
int compositeState = (int)eventData.Payload[1];
if ((compositeState & 0b001) == 0b001)
{
activity.SetStatus(Status.Unset);
}
else if ((compositeState & 0b010) == 0b010)
{
var errorText = $"SqlExceptionNumber {eventData.Payload[2]} thrown.";
activity.SetStatus(Status.Error.WithDescription(errorText));
}
else
{
activity.SetStatus(Status.Error.WithDescription("Unknown Sql failure."));
}
}
}
finally
{
activity.Stop();
}
}
}
}
#endif