/Echo/Program.cs

using System;

using System.Collections.Generic;

using System.IO;

using System.Linq;

using System.Text.RegularExpressions;

using System.Threading;

using CsvLogTailing;

using Mono.Options;



namespace Echo

{

	/// <summary>

	/// This is a little test program that will echo tailed logs to console and optionally to 

	/// file also (means you can do a quick file diff to make sure you are picking up all logs)

	/// </summary>

	class Program

	{

		static void Main(string[] args)

		{

			string logFileOrDirPath = null;

			string directoryFilter = null;

			string excludeRegexString = null;

			string[] columns = null;

			bool echoToFile = false;



			var optionSet = new OptionSet

			{

				{ "p|path=", p => logFileOrDirPath = p },

				{ "f|filter=", f => directoryFilter = f },

				{ "x|excludeRegex=", x => excludeRegexString = x },

				{ "c|columns=", c => columns = c.Split(',').Select(x => x.Trim()).ToArray() },

				{ "ef|echotofile", p => echoToFile = true }

			};



			optionSet.Parse(args);



			Console.WriteLine("Press return to finish");



			var tailer = new CsvLogTailer(forceMemoryCollectionThreshold: 1000);



			var exceptions = new List<Exception>();

			var exSub = tailer.Exceptions.Subscribe(ex =>

				{

					Console.WriteLine("PARSE EXCEPTION");

					exceptions.Add(ex);

				});



			int i = 0;

			tailer

				.Tail(new CsvLogTailerSettings

					{

						FileOrDirectoryPath = logFileOrDirPath,

						DirectoryFilter = directoryFilter,

						FileNameExcludeRegex = String.IsNullOrWhiteSpace(excludeRegexString) ? null : new Regex(excludeRegexString, RegexOptions.IgnoreCase | RegexOptions.Compiled),

						ColumnNamesProvider = file => columns,

						BookmarkRepositoryUpdateFrequency = TimeSpan.FromSeconds(2)

					})

				.Subscribe(

					log =>

					{

						var fileName = Path.GetFileName(log.FilePath);

						string logLine = String.Join("|", log.LogFields);



						if (echoToFile)

						{

							var dir = Path.GetDirectoryName(log.FilePath);

							var echoFilePath = Path.Combine(dir, fileName + ".echo");

							File.AppendAllText(echoFilePath, logLine + Environment.NewLine);

						}



						//if (i++ % 100 == 0)

						//	Console.WriteLine("[{0} {1}]: {2}", log.LogDateTime, fileName, logLine);

					},

					error => Console.WriteLine("ERROR (SUBSCRIPTION STOPPED): " + error.ToString()));



			Console.ReadLine();



			exSub.Dispose();

			if (exceptions.Any())

			{

				foreach (Exception exception in exceptions)

					Console.WriteLine(exception);



				Console.WriteLine("Showing {0} exceptions", exceptions.Count);

			}

		}

	}

}