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Log4NetTraceListener.cs
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Log4NetTraceListener.cs
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// This code is taken from the Cavity project (https://code.google.com/p/cavity/) by Alan Dean
// Retrieved on 2015-06-22 from:
// https://code.google.com/p/cavity/source/browse/trunk/src/Cavity%20Diagnostics%20log4net/Class%20Libraries/Diagnostics.Log4Net/Diagnostics/Log4NetTraceListener.cs
// Code License: MIT License (http://www.opensource.org/licenses/mit-license.php)
// Source for similar implementation targeting NLog (included in the NLog assembly) is here: https://github.com/jkowalski/NLog/blob/master/src/NLog/NLogTraceListener.cs
namespace Cavity.Diagnostics
{
using System;
using System.Diagnostics;
using System.Diagnostics.CodeAnalysis;
using System.Globalization;
using System.Linq;
using log4net;
public class Log4NetTraceListener : TraceListener
{
public override void Fail(string message)
{
Fail(message, string.Empty);
}
public override void Fail(string message,
string detailMessage)
{
var stack = new StackTrace();
var frame = GetTracingStackFrame(stack);
var log = LogManager.GetLogger(frame.GetMethod().DeclaringType);
if (!log.IsWarnEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
message = string.IsNullOrEmpty(detailMessage)
? message
: string.Format(CultureInfo.InvariantCulture, "{0}{1}{2}", message, Environment.NewLine, detailMessage);
log.WarnFormat("[Fail] {0}", message);
}
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Temporary")]
public override void TraceData(TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id,
object data)
{
var array = new[]
{
data
};
TraceData(eventCache,
source,
eventType,
id,
array);
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Temporary")]
public override void TraceData(TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id,
params object[] data)
{
if (null == data ||
0 == data.Length)
{
TraceEvent(eventCache, source, eventType, id);
return;
}
#if NET20
foreach (var datum in data)
{
if (TraceException(eventType, datum))
{
continue;
}
var array = new[]
{
datum
};
TraceEvent(eventCache,
source,
eventType,
id,
"{0}",
array);
}
#else
foreach (var datum in data.Where(x => !TraceException(eventType, x)))
{
var array = new[]
{
datum
};
TraceEvent(eventCache,
source,
eventType,
id,
"{0}",
array);
}
#endif
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Temporary")]
public override void TraceEvent(TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id)
{
var frame = GetTracingStackFrame(new StackTrace());
var log = LogManager.GetLogger(frame.GetMethod().DeclaringType);
switch (eventType)
{
case TraceEventType.Critical:
if (!log.IsFatalEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Fatal(string.Empty);
}
break;
case TraceEventType.Error:
if (!log.IsFatalEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Error(string.Empty);
}
break;
case TraceEventType.Information:
if (!log.IsInfoEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Info(string.Empty);
}
break;
case TraceEventType.Resume:
case TraceEventType.Start:
case TraceEventType.Stop:
case TraceEventType.Suspend:
case TraceEventType.Transfer:
case TraceEventType.Verbose:
if (!log.IsDebugEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Debug(string.Empty);
}
break;
case TraceEventType.Warning:
if (!log.IsWarnEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Warn(string.Empty);
}
break;
}
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Argument cannot be null")]
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "5", Justification = "Argument cannot be null")]
public override void TraceEvent(TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id,
string format,
// ReSharper disable MethodOverloadWithOptionalParameter
params object[] args)
{
// ReSharper restore MethodOverloadWithOptionalParameter
if (0 == args.Length)
{
TraceEvent(eventCache, source, eventType, id);
}
var frame = GetTracingStackFrame(new StackTrace());
var log = LogManager.GetLogger(frame.GetMethod().DeclaringType);
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
switch (eventType)
{
case TraceEventType.Critical:
if (!log.IsFatalEnabled)
{
return;
}
log.FatalFormat(CultureInfo.CurrentCulture, format, args);
break;
case TraceEventType.Error:
if (!log.IsFatalEnabled)
{
return;
}
log.ErrorFormat(CultureInfo.CurrentCulture, format, args);
break;
case TraceEventType.Information:
if (!log.IsInfoEnabled)
{
return;
}
log.InfoFormat(CultureInfo.CurrentCulture, format, args);
break;
case TraceEventType.Resume:
case TraceEventType.Start:
case TraceEventType.Stop:
case TraceEventType.Suspend:
case TraceEventType.Transfer:
case TraceEventType.Verbose:
if (!log.IsDebugEnabled)
{
return;
}
log.DebugFormat(CultureInfo.CurrentCulture, format, args);
break;
case TraceEventType.Warning:
if (!log.IsWarnEnabled)
{
return;
}
log.WarnFormat(CultureInfo.CurrentCulture, format, args);
break;
}
}
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Temporary")]
public override void TraceEvent(TraceEventCache eventCache,
string source,
TraceEventType eventType,
int id,
string message)
{
var array = new[]
{
message
};
TraceEvent(eventCache,
source,
eventType,
id,
"{0}",
// ReSharper disable CoVariantArrayConversion
array);
// ReSharper restore CoVariantArrayConversion
}
[SuppressMessage("Microsoft.Design", "CA1062:Validate arguments of public methods", MessageId = "0", Justification = "Temporary")]
public override void TraceTransfer(TraceEventCache eventCache,
string source,
int id,
string message,
Guid relatedActivityId)
{
var array = new object[]
{
message, relatedActivityId
};
TraceEvent(eventCache,
source,
TraceEventType.Transfer,
id,
"{0}",
array);
}
public override void Write(object o)
{
WriteLine(o, string.Empty);
}
public override void Write(object o,
string category)
{
WriteLine(o, category);
}
public override void Write(string message)
{
WriteLine(message, string.Empty);
}
public override void Write(string message,
string category)
{
WriteLine((object)message, category);
}
public override void WriteLine(object o)
{
WriteLine(o, string.Empty);
}
[SuppressMessage("Microsoft.Globalization", "CA1303:Do not pass literals as localized parameters", MessageId = "log4net.Util.ThreadContextStack.Push(System.String)", Justification = "Temporary")]
public override void WriteLine(object o,
string category)
{
var stack = new StackTrace();
var frame = GetTracingStackFrame(stack);
var log = LogManager.GetLogger(frame.GetMethod().DeclaringType);
if (!log.IsInfoEnabled)
{
return;
}
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
if (string.IsNullOrEmpty(category))
{
log.Debug(o);
}
else
{
log.DebugFormat("[{0}] {1}", category, o);
}
}
}
public override void WriteLine(string message,
string category)
{
WriteLine((object)message, category);
}
public override void WriteLine(string message)
{
WriteLine(message, string.Empty);
}
private static StackFrame GetTracingStackFrame(StackTrace stack)
{
for (var i = 0; i < stack.FrameCount; i++)
{
var frame = stack.GetFrame(i);
var method = frame.GetMethod();
if (null == method)
{
continue;
}
// ReSharper disable PossibleNullReferenceException
if ("System.Diagnostics" == method.DeclaringType.Namespace)
{
// ReSharper restore PossibleNullReferenceException
continue;
}
if ("System.Threading" == method.DeclaringType.Namespace)
{
continue;
}
if ("Log4NetTraceListener" == method.DeclaringType.Name)
{
continue;
}
return stack.GetFrame(i);
}
return null;
}
private static bool TraceException(TraceEventType eventType,
object datum)
{
if (TraceEventType.Critical != eventType &&
TraceEventType.Error != eventType)
{
return false;
}
var exception = datum as Exception;
if (null == exception)
{
return false;
}
var frame = GetTracingStackFrame(new StackTrace());
var log = LogManager.GetLogger(frame.GetMethod().DeclaringType);
switch (eventType)
{
case TraceEventType.Critical:
if (log.IsFatalEnabled)
{
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Fatal(exception.Message, exception);
}
}
break;
case TraceEventType.Error:
if (log.IsErrorEnabled)
{
using (ThreadContext.Stacks["signature"].Push(frame.GetMethod().Name))
{
log.Error(exception.Message, exception);
}
}
break;
}
return true;
}
}
}