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Logger.cs
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Logger.cs
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using CircularBuffer;
using System.Diagnostics;
using System.Reflection;
using System.Runtime.CompilerServices;
using System.Text;
namespace Voidway_Bot
{
internal static class Logger
{
internal struct Reason
{
public string name = "???";
public bool logCaller = false;
public bool writeToFile = true;
public ConsoleColor nameColor = ConsoleColor.Blue;
public ConsoleColor textColor = ConsoleColor.White;
public static readonly Reason Normal = new()
{
name = "Normal",
};
public static readonly Reason Debug = new()
{
name = "Debug",
logCaller = true,
writeToFile = true,
nameColor = ConsoleColor.Gray,
textColor = ConsoleColor.DarkGray
};
public static readonly Reason Trace = new()
{
name = "Trace",
logCaller = true,
writeToFile = false,
nameColor = ConsoleColor.DarkGray,
textColor = ConsoleColor.DarkGray
};
public static readonly Reason Warn = new()
{
name = "Warning",
logCaller = true,
writeToFile = true,
nameColor = ConsoleColor.DarkYellow,
textColor = ConsoleColor.Yellow
};
public static readonly Reason Fatal = new()
{
name = "Fatal",
logCaller = true,
writeToFile = true,
nameColor = ConsoleColor.DarkRed,
textColor = ConsoleColor.Red
};
public Reason() { }
}
const string PUT_DATE_FORMAT = "hh:mm:sstt"; // example: "12:33:05AM"
const string FILE_DATE_FORMAT = "yyyy-MM-dd h_m_stt"; // example: "2022-10-23 12_01_47AM"
readonly static int maxPutDateLength = PUT_DATE_FORMAT.Length;
internal static readonly CircularBuffer<string> logStatements = new(128);
static readonly StreamWriter logFile;
static Logger()
{
int maxFiles = Config.GetMaxLogFiles();
if (!Directory.Exists(Config.GetLogPath())) Directory.CreateDirectory(Config.GetLogPath());
string filePath = Path.Combine(Config.GetLogPath(), DateTime.Now.ToString(FILE_DATE_FORMAT) + ".log");
Console.WriteLine("Initializing logger");
logFile = File.AppendText(filePath);
Put("Created stream writer - logger now active, writing to " + filePath);
// delete oldest log files over max log file count
// https://stackoverflow.com/questions/20486559/get-a-list-of-files-in-a-directory-in-descending-order-by-creation-date-using-c#20486570
DirectoryInfo dir = new(Config.GetLogPath());
FileInfo[] files = dir.GetFiles().OrderByDescending(f => f.LastWriteTime).ToArray();
foreach (FileInfo file in files.Skip(maxFiles))
{
Put($"Deleting old log {file.Name}", Reason.Debug);
file.Delete();
}
if (files.Length > maxFiles) Put($"Deleted {files.Length - maxFiles} old log file{(files.Length - maxFiles == 1 ? "" : "s")}.");
}
public static void Error(string str) => Put(str, Reason.Fatal, false);
public static void Error(string str, Exception ex) => Put(str + "\n\t" + ex.ToString(), Reason.Fatal, false);
public static void Warn(string str) => Put(str, Reason.Warn, false);
public static void Warn(string str, Exception ex) => Put(str + "\n\t" + ex.ToString(), Reason.Warn, false);
public static void Put(string str) => Put(str, Reason.Normal);
public static void Put(string str, Reason reason, bool cleanMultiline = true)
{
if (string.IsNullOrWhiteSpace(str)) str = "<N/A>";
else if (cleanMultiline) str = str.Replace("\r\n", " // ").Replace("\n", " // ");
string starter = $"[{GetPutTime()}] ";
string reasonStr = reason.logCaller ? $"{reason.name} @ {GetCaller()}" : reason.name;
string fileString = $"{starter}{reasonStr} -> {str}";
Console.ForegroundColor = ConsoleColor.Yellow;
Console.Write(starter);
Console.ForegroundColor = reason.nameColor;
Console.Write(reasonStr);
Console.ForegroundColor = reason.textColor;
Console.Write(" -> ");
Console.WriteLine(str);
Console.ResetColor();
if (reason.writeToFile)
{
logFile.WriteLine($"{starter}{reasonStr} -> {str}");
logFile.Flush();
}
logStatements.PushBack(fileString);
}
public static string EnsureShorterThan(string str, int maxLen)
{
if (str.Length < maxLen) return str;
return str[..(maxLen - 3)] + "...";
}
static string GetPutTime() => DateTime.Now.ToString(PUT_DATE_FORMAT).PadLeft(maxPutDateLength);
static string GetCaller()
{
StackTrace trace = new(1, true);
foreach (StackFrame frame in trace.GetFrames())
{
MethodBase? method = frame.GetMethod();
Type? decType = method?.DeclaringType;
if (method is null || decType is null) continue;
if (IsVoidwayMoveNext(decType))
{
return decType.DeclaringType!.Name + '.' + decType.Name.Split('>').First().Substring(1);
}
else if (decType != typeof(Logger) && decType != typeof(DiscordLogger) && IsTypeLoggable(decType))
{
return decType.Name + '.' + method.Name;
}
}
return "???";
}
static bool IsTypeLoggable(Type t)
{
// all this to avoid seeing "<MainAsync>d__1.MoveNext"
return t.GetCustomAttribute(typeof(CompilerGeneratedAttribute)) is null && t.Assembly == typeof(Logger).Assembly;
}
static bool IsVoidwayMoveNext(Type t)
{
return t.GetCustomAttribute(typeof(CompilerGeneratedAttribute)) is not null && t.GetInterfaces().Any(i => i == typeof(IAsyncStateMachine));
}
}
}