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TransformLevelsLogExtensions.cs
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TransformLevelsLogExtensions.cs
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using System;
using System.Collections.Generic;
using JetBrains.Annotations;
namespace Vostok.Logging.Abstractions
{
[PublicAPI]
public static class TransformLevelsLogExtensions
{
private static IReadOnlyDictionary<LogLevel, LogLevel> errorToWarn = new Dictionary<LogLevel, LogLevel>
{
[LogLevel.Error] = LogLevel.Warn
};
/// <summary>
/// Returns a wrapper log that transforms log levels of incoming log events according to provided mapping.
/// </summary>
[Pure]
public static ILog WithLevelsTransformation([NotNull] this ILog log, [NotNull] IReadOnlyDictionary<LogLevel, LogLevel> mapping)
=> new TransformLevelsLog(log, mapping);
/// <summary>
/// Returns a wrapper log that transforms error level of incoming log events to warning level.
/// </summary>
[Pure]
public static ILog WithErrorsTransformedToWarns([NotNull] this ILog log)
=> log.WithLevelsTransformation(errorToWarn);
private class TransformLevelsLog : ILog
{
private readonly ILog baseLog;
private readonly IReadOnlyDictionary<LogLevel, LogLevel> mapping;
public TransformLevelsLog(ILog baseLog, IReadOnlyDictionary<LogLevel, LogLevel> mapping)
{
this.baseLog = baseLog ?? throw new ArgumentNullException(nameof(baseLog));
this.mapping = mapping ?? throw new ArgumentNullException(nameof(mapping));
}
public void Log(LogEvent @event)
{
if (@event != null)
{
var transformedLevel = TransformLevel(@event.Level);
if (transformedLevel != @event.Level)
@event = @event.WithLevel(transformedLevel);
}
baseLog.Log(@event);
}
public bool IsEnabledFor(LogLevel level) =>
baseLog.IsEnabledFor(TransformLevel(level));
public ILog ForContext(string context)
{
var baseLogForContext = baseLog.ForContext(context);
return ReferenceEquals(baseLogForContext, baseLog) ? this : new TransformLevelsLog(baseLogForContext, mapping);
}
private LogLevel TransformLevel(LogLevel level)
=> mapping.TryGetValue(level, out var mappedLevel) ? mappedLevel : level;
}
}
}