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LoggerImpl.cs
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LoggerImpl.cs
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//
// Copyright (c) 2004-2018 Jaroslaw Kowalski <jaak@jkowalski.net>, Kim Christensen, Julian Verdurmen
//
// 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 JetBrains.Annotations;
using NLog.Common;
using NLog.Config;
using NLog.Filters;
using NLog.Internal;
/// <summary>
/// Implementation of logging engine.
/// </summary>
internal static class LoggerImpl
{
private const int StackTraceSkipMethods = 0;
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA2204:Literals should be spelled correctly", Justification = "Using 'NLog' in message.")]
internal static void Write([NotNull] Type loggerType, TargetWithFilterChain targets, LogEventInfo logEvent, LogFactory factory)
{
if (targets == null)
{
return;
}
#if !NETSTANDARD1_0 || NETSTANDARD1_5
StackTraceUsage stu = targets.GetStackTraceUsage();
if (stu != StackTraceUsage.None && !logEvent.HasStackTrace)
{
#if NETSTANDARD1_5
var stackTrace = (StackTrace)Activator.CreateInstance(typeof(StackTrace), new object[] { stu == StackTraceUsage.WithSource });
#elif !SILVERLIGHT
var stackTrace = new StackTrace(StackTraceSkipMethods, stu == StackTraceUsage.WithSource);
#else
var stackTrace = new StackTrace();
#endif
var stackFrames = stackTrace.GetFrames();
int? firstUserFrame = FindCallingMethodOnStackTrace(stackFrames, loggerType);
int? firstLegacyUserFrame = firstUserFrame.HasValue ? SkipToUserStackFrameLegacy(stackFrames, firstUserFrame.Value) : (int?)null;
logEvent.GetCallSiteInformationInternal().SetStackTrace(stackTrace, firstUserFrame ?? 0, firstLegacyUserFrame);
}
#endif
AsyncContinuation exceptionHandler = (ex) => { };
if (factory.ThrowExceptions)
{
int originalThreadId = AsyncHelpers.GetManagedThreadId();
exceptionHandler = ex =>
{
if (ex != null && AsyncHelpers.GetManagedThreadId() == originalThreadId)
{
throw new NLogRuntimeException("Exception occurred in NLog", ex);
}
};
}
if (targets.NextInChain == null && logEvent.CanLogEventDeferMessageFormat())
{
// Change MessageFormatter so it writes directly to StringBuilder without string-allocation
logEvent.MessageFormatter = LogMessageTemplateFormatter.DefaultAutoSingleTarget.MessageFormatter;
}
IList<Filter> prevFilterChain = null;
FilterResult prevFilterResult = FilterResult.Neutral;
for (var t = targets; t != null; t = t.NextInChain)
{
FilterResult result = ReferenceEquals(prevFilterChain, t.FilterChain) ?
prevFilterResult : GetFilterResult(t.FilterChain, logEvent, t.DefaultResult);
if (!WriteToTargetWithFilterChain(t.Target, result, logEvent, exceptionHandler))
{
break;
}
prevFilterResult = result; // Cache the result, and reuse it for the next target, if it comes from the same logging-rule
prevFilterChain = t.FilterChain;
}
}
/// <summary>
/// Finds first user stack frame in a stack trace
/// </summary>
/// <param name="stackFrames">The stack trace of the logging method invocation</param>
/// <param name="loggerType">Type of the logger or logger wrapper. This is still Logger if it's a subclass of Logger.</param>
/// <returns>Index of the first user stack frame or 0 if all stack frames are non-user</returns>
internal static int? FindCallingMethodOnStackTrace(StackFrame[] stackFrames, [NotNull] Type loggerType)
{
if (stackFrames == null || stackFrames.Length == 0)
return null;
int? firstStackFrameAfterLogger = null;
int? firstUserStackFrame = null;
for (int i = 0; i < stackFrames.Length; ++i)
{
var stackFrame = stackFrames[i];
if (SkipAssembly(stackFrame))
continue;
if (!firstUserStackFrame.HasValue)
firstUserStackFrame = i;
if (IsLoggerType(stackFrame, loggerType))
{
firstStackFrameAfterLogger = null;
continue;
}
if (!firstStackFrameAfterLogger.HasValue)
firstStackFrameAfterLogger = i;
}
return firstStackFrameAfterLogger ?? firstUserStackFrame;
}
/// <summary>
/// This is only done for legacy reason, as the correct method-name and line-number should be extracted from the MoveNext-StackFrame
/// </summary>
/// <param name="stackFrames">The stack trace of the logging method invocation</param>
/// <param name="firstUserStackFrame">Starting point for skipping async MoveNext-frames</param>
internal static int SkipToUserStackFrameLegacy(StackFrame[] stackFrames, int firstUserStackFrame)
{
#if NET4_5
for (int i = firstUserStackFrame; i < stackFrames.Length; ++i)
{
var stackFrame = stackFrames[i];
if (SkipAssembly(stackFrame))
continue;
if (stackFrame.GetMethod()?.Name == "MoveNext" && stackFrames.Length > i)
{
var nextStackFrame = stackFrames[i + 1];
var declaringType = nextStackFrame.GetMethod()?.DeclaringType;
if (declaringType == typeof(System.Runtime.CompilerServices.AsyncTaskMethodBuilder) ||
declaringType == typeof(System.Runtime.CompilerServices.AsyncTaskMethodBuilder<>))
{
//async, search futher
continue;
}
}
return i;
}
#endif
return firstUserStackFrame;
}
/// <summary>
/// Assembly to skip?
/// </summary>
/// <param name="frame">Find assembly via this frame. </param>
/// <returns><c>true</c>, we should skip.</returns>
private static bool SkipAssembly(StackFrame frame)
{
var assembly = StackTraceUsageUtils.LookupAssemblyFromStackFrame(frame);
return assembly == null || LogManager.IsHiddenAssembly(assembly);
}
/// <summary>
/// Is this the type of the logger?
/// </summary>
/// <param name="frame">get type of this logger in this frame.</param>
/// <param name="loggerType">Type of the logger.</param>
/// <returns></returns>
private static bool IsLoggerType(StackFrame frame, Type loggerType)
{
var method = frame.GetMethod();
Type declaringType = method?.DeclaringType;
var isLoggerType = declaringType != null && (loggerType == declaringType || declaringType.IsSubclassOf(loggerType) || loggerType.IsAssignableFrom(declaringType));
return isLoggerType;
}
private static bool WriteToTargetWithFilterChain(Targets.Target target, FilterResult result, LogEventInfo logEvent, AsyncContinuation onException)
{
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>
/// <param name="defaultFilterResult">default result if there are no filters, or none of the filters decides.</param>
/// <returns>The result of the filter.</returns>
private static FilterResult GetFilterResult(IList<Filter> filterChain, LogEventInfo logEvent, FilterResult defaultFilterResult)
{
FilterResult result = defaultFilterResult;
if (filterChain == null || filterChain.Count == 0)
return result;
try
{
//Memory profiling pointed out that using a foreach-loop was allocating
//an Enumerator. Switching to a for-loop avoids the memory allocation.
for (int i = 0; i < filterChain.Count; i++)
{
Filter f = filterChain[i];
result = f.GetFilterResult(logEvent);
if (result != FilterResult.Neutral)
{
return result;
}
}
return defaultFilterResult;
}
catch (Exception exception)
{
InternalLogger.Warn(exception, "Exception during filter evaluation. Message will be ignore.");
if (exception.MustBeRethrown())
{
throw;
}
return FilterResult.Ignore;
}
}
}
}