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//
// Copyright (c) 2004-2011 Jaroslaw Kowalski <jaak@jkowalski.net>
//
// All rights reserved.
//
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions
// are met:
//
// * Redistributions of source code must retain the above copyright notice,
// this list of conditions and the following disclaimer.
//
// * Redistributions in binary form must reproduce the above copyright notice,
// this list of conditions and the following disclaimer in the documentation
// and/or other materials provided with the distribution.
//
// * Neither the name of Jaroslaw Kowalski nor the names of its
// contributors may be used to endorse or promote products derived from this
// software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
// THE POSSIBILITY OF SUCH DAMAGE.
//
namespace NLog
{
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Reflection;
using System.Threading;
using NLog.Common;
using NLog.Config;
using NLog.Filters;
using NLog.Internal;
using NLog.Targets;
/// <summary>
/// Implementation of logging engine.
/// </summary>
internal static class LoggerImpl
{
private const int StackTraceSkipMethods = 0;
private static readonly Assembly nlogAssembly = typeof(LoggerImpl).Assembly;
private static readonly Assembly mscorlibAssembly = typeof(string).Assembly;
private static readonly Assembly systemAssembly = typeof(Debug).Assembly;
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", Justification = "Using 'NLog' in message.")]
internal static void Write(Type loggerType, TargetWithFilterChain targets, LogEventInfo logEvent, LogFactory factory)
{
if (targets == null)
{
return;
}
#if !NET_CF
StackTraceUsage stu = targets.GetStackTraceUsage();
if (stu != StackTraceUsage.None && !logEvent.HasStackTrace)
{
StackTrace stackTrace;
#if !SILVERLIGHT
stackTrace = new StackTrace(StackTraceSkipMethods, stu == StackTraceUsage.WithSource);
#else
stackTrace = new StackTrace();
#endif
int firstUserFrame = FindCallingMethodOnStackTrace(stackTrace, loggerType);
logEvent.SetStackTrace(stackTrace, firstUserFrame);
}
#endif
int originalThreadId = Thread.CurrentThread.ManagedThreadId;
AsyncContinuation exceptionHandler = ex =>
{
if (ex != null)
{
if (factory.ThrowExceptions && Thread.CurrentThread.ManagedThreadId == originalThreadId)
{
throw new NLogRuntimeException("Exception occurred in NLog", ex);
}
}
};
for (var t = targets; t != null; t = t.NextInChain)
{
if (!WriteToTargetWithFilterChain(t, logEvent, exceptionHandler))
{
break;
}
}
}
#if !NET_CF
private static int FindCallingMethodOnStackTrace(StackTrace stackTrace, Type loggerType)
{
int firstUserFrame = 0;
for (int i = 0; i < stackTrace.FrameCount; ++i)
{
StackFrame frame = stackTrace.GetFrame(i);
MethodBase mb = frame.GetMethod();
Assembly methodAssembly = null;
if (mb.DeclaringType != null)
{
methodAssembly = mb.DeclaringType.Assembly;
}
if (SkipAssembly(methodAssembly) || mb.DeclaringType == loggerType)
{
firstUserFrame = i + 1;
}
else
{
if (firstUserFrame != 0)
{
break;
}
}
}
return firstUserFrame;
}
private static bool SkipAssembly(Assembly assembly)
{
if (assembly == nlogAssembly)
{
return true;
}
if (assembly == mscorlibAssembly)
{
return true;
}
if (assembly == systemAssembly)
{
return true;
}
return false;
}
#endif
private static bool WriteToTargetWithFilterChain(TargetWithFilterChain targetListHead, LogEventInfo logEvent, AsyncContinuation onException)
{
Target target = targetListHead.Target;
FilterResult result = GetFilterResult(targetListHead.FilterChain, logEvent);
if ((result == FilterResult.Ignore) || (result == FilterResult.IgnoreFinal))
{
if (InternalLogger.IsDebugEnabled)
{
InternalLogger.Debug("{0}.{1} Rejecting message because of a filter.", logEvent.LoggerName, logEvent.Level);
}
if (result == FilterResult.IgnoreFinal)
{
return false;
}
return true;
}
target.WriteAsyncLogEvent(logEvent.WithContinuation(onException));
if (result == FilterResult.LogFinal)
{
return false;
}
return true;
}
/// <summary>
/// Gets the filter result.
/// </summary>
/// <param name="filterChain">The filter chain.</param>
/// <param name="logEvent">The log event.</param>
/// <returns>The result of the filter.</returns>
private static FilterResult GetFilterResult(IEnumerable<Filter> filterChain, LogEventInfo logEvent)
{
FilterResult result = FilterResult.Neutral;
try
{
foreach (Filter f in filterChain)
{
result = f.GetFilterResult(logEvent);
if (result != FilterResult.Neutral)
{
break;
}
}
return result;
}
catch (Exception exception)
{
if (exception.MustBeRethrown())
{
throw;
}
InternalLogger.Warn("Exception during filter evaluation: {0}", exception);
return FilterResult.Ignore;
}
}
}
}
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