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Programming language: C#
License: MIT License
Tags: Logging     Logfiles     NetCore     Netstandard     File    

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README

NReco.Logging.File

Simple and efficient file logger provider for .NET Core (any version) without additional dependencies.

NuGet Release

  • very similar to standard ConsoleLogger but writes to a file
  • can append to existing file or overwrite log file on restart
  • supports a 'rolling file' behaviour and can control total log size
  • it is possible to change log file name on-the-fly
  • suitable for intensive concurrent usage: has internal message queue to avoid threads blocking

How to use

Add NReco.Logging.File package reference and initialize a file logging provider in services.AddLogging (Startup.cs):

services.AddLogging(loggingBuilder => {
    loggingBuilder.AddFile("app.log", append:true);
});

or

services.AddLogging(loggingBuilder => {
    var loggingSection = Configuration.GetSection("Logging");
    loggingBuilder.AddFile(loggingSection);
});

Example of the configuration section in appsettings.json:

"Logging": {
    "LogLevel": {
      "Default": "Debug",
      "System": "Information",
      "Microsoft": "Error"
    },
    "File": {
        "Path": "app.log",
        "Append": "True",
        "FileSizeLimitBytes": 0,  // use to activate rolling file behaviour
        "MaxRollingFiles": 0  // use to specify max number of log files
    }
}

Rolling File

This feature is activated with FileLoggerOptions properties: FileSizeLimitBytes and MaxRollingFiles. Lets assume that file logger is configured for "test.log":

  • if only FileSizeLimitBytes is specified file logger will create "test.log", "test1.log", "test2.log" etc
  • use MaxRollingFiles in addition to FileSizeLimitBytes to limit number of log files; for example, for value "3" file logger will create "test.log", "test1.log", "test2.log" and again "test.log", "test1.log" (old files will be overwritten).

Change log file name on-the-fly

It is possible to specify a custom log file name formatter with FileLoggerOptions property FormatLogFileName. Log file name may change in time - for example, to create a new log file per day:

services.AddLogging(loggingBuilder => {
    loggingBuilder.AddFile("app_{0:yyyy}-{0:MM}-{0:dd}.log", fileLoggerOpts => {
        fileLoggerOpts.FormatLogFileName = fName => {
            return String.Format(fName, DateTime.UtcNow);
        };
    });
});

Note that this handler is called on every log message 'write'; you may cache the log file name calculation in your handler to avoid any potential overhead in case of high-load logger usage.

Custom log entry formatting

You can specify FileLoggerProvider.FormatLogEntry handler to customize log entry content. For example, it is possible to write log entry as JSON array:

loggerFactory.AddProvider(new NReco.Logging.File.FileLoggerProvider("logs/app.js", true) {
    FormatLogEntry = (msg) => {
        var sb = new System.Text.StringBuilder();
        StringWriter sw = new StringWriter(sb);
        var jsonWriter = new Newtonsoft.Json.JsonTextWriter(sw);
        jsonWriter.WriteStartArray();
        jsonWriter.WriteValue(DateTime.Now.ToString("o"));
        jsonWriter.WriteValue(msg.LogLevel.ToString());
        jsonWriter.WriteValue(msg.LogName);
        jsonWriter.WriteValue(msg.EventId.Id);
        jsonWriter.WriteValue(msg.Message);
        jsonWriter.WriteValue(msg.Exception?.ToString());
        jsonWriter.WriteEndArray();
        return sb.ToString();
    }
});

(in case of .NET Core 2 use loggingBuilder.AddProvider instead of loggerFactory.AddProvider).

License

Copyright 2017-2020 Vitaliy Fedorchenko and contributors

Distributed under the MIT license


*Note that all licence references and agreements mentioned in the NReco.Logging.File README section above are relevant to that project's source code only.