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ColoredConsoleLogProvider.cs
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160 lines (138 loc) · 5.5 KB
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using System;
using System.Collections.Generic;
using System.Globalization;
using ScriptCs.Contracts;
namespace ScriptCs.Hosting
{
public class ColoredConsoleLogProvider : ILogProvider
{
private static readonly Disposable disposable = new Disposable();
private static readonly Dictionary<LogLevel, ConsoleColor> colors =
new Dictionary<LogLevel, ConsoleColor>
{
{ LogLevel.Fatal, ConsoleColor.Red },
{ LogLevel.Error, ConsoleColor.Red },
{ LogLevel.Warn, ConsoleColor.DarkYellow },
{ LogLevel.Info, ConsoleColor.Gray },
{ LogLevel.Debug, ConsoleColor.DarkGray },
{ LogLevel.Trace, ConsoleColor.DarkMagenta },
};
private readonly LogLevel _logLevel;
private readonly IConsole _console;
public ColoredConsoleLogProvider(LogLevel logLevel, IConsole console)
{
Guard.AgainstNullArgument("console", console);
_logLevel = logLevel;
_console = console;
}
public Logger GetLogger(string name)
{
return (logLevel, messageFunc, exception, formatParameters) =>
Log(name, logLevel, messageFunc, exception, formatParameters);
}
public IDisposable OpenNestedContext(string message) => disposable;
public IDisposable OpenMappedContext(string key, string value) => disposable;
public bool Log(
string name, LogLevel logLevel, Func<string> messageFunc, Exception exception, params object[] formatParameters)
{
Guard.AgainstNullArgument("formatParameters", formatParameters);
var isEnabled = IsEnabled(logLevel);
if (!isEnabled || messageFunc == null)
{
return isEnabled;
}
var prefix = logLevel == LogLevel.Info
? null
: string.Concat(logLevel.ToString().ToUpperInvariant(), ": ");
if (_logLevel == LogLevel.Debug || _logLevel == LogLevel.Trace)
{
prefix = string.Concat(prefix, "[", name, "] ");
}
var message = string.Format(CultureInfo.InvariantCulture, messageFunc(), formatParameters);
var suffix = string.Empty;
if (exception != null)
{
if (_logLevel == LogLevel.Debug || _logLevel == LogLevel.Trace)
{
var exceptions = new List<string>();
while (exception != null)
{
var exceptionString = string.Format(
CultureInfo.InvariantCulture,
"[{0}] {1}{2}{3}",
exception.GetType().FullName,
exception.Message,
Environment.NewLine,
exception.StackTrace);
exceptions.Add(exceptionString);
exception = exception.InnerException;
}
var divider = string.Format(
CultureInfo.InvariantCulture, "{0}{1}{0}", Environment.NewLine, "=== INNER EXCEPTION ===");
suffix = " " + string.Join(divider, exceptions);
}
else
{
suffix = string.Format(
CultureInfo.InvariantCulture, " [{0}] {1}", exception.GetType().Name, exception.Message);
}
}
ConsoleColor color;
if (!colors.TryGetValue(logLevel, out color))
{
color = ConsoleColor.White;
}
var originalColor = _console.ForegroundColor;
_console.ForegroundColor = color;
try
{
_console.WriteLine(string.Concat(prefix, message, suffix));
}
finally
{
_console.ForegroundColor = originalColor;
}
return true;
}
private bool IsEnabled(LogLevel logLevel)
{
switch (logLevel)
{
case LogLevel.Fatal:
return true;
case LogLevel.Error:
return
_logLevel == LogLevel.Error ||
_logLevel == LogLevel.Warn ||
_logLevel == LogLevel.Info ||
_logLevel == LogLevel.Debug ||
_logLevel == LogLevel.Trace;
case LogLevel.Warn:
return
_logLevel == LogLevel.Warn ||
_logLevel == LogLevel.Info ||
_logLevel == LogLevel.Debug ||
_logLevel == LogLevel.Trace;
case LogLevel.Info:
return
_logLevel == LogLevel.Info ||
_logLevel == LogLevel.Debug ||
_logLevel == LogLevel.Trace;
case LogLevel.Debug:
return
_logLevel == LogLevel.Debug ||
_logLevel == LogLevel.Trace;
case LogLevel.Trace:
return
_logLevel == LogLevel.Trace;
}
return true;
}
private sealed class Disposable : IDisposable
{
public void Dispose()
{
}
}
}
}