.Net Core使用Logger实现log写入本地文件系统
.net core 自带一个基础的logger框架Microsoft.Extensions.Logging。
微软默认实现了Microsoft.Extensions.Logging.Console.dll。控制台的日志输出和Microsoft.Extensions.Logging.Debug.dll调试输出。
下面我们写一个我们自己的本地文件输出模块demo,简单理解一下自带的这个logger系统。
logger框架主要几个类:LoggerFactory,Logger,LoggerProvider。
看名字就很好理解,都不需要解释。
实现我们自己的file logger只需要实现logger,loggerProvider即可。
第一步:入口。
loggerFactory.AddFile(this.Configuration.GetSection("FileLogging"));
为LoggerFactory扩张一个方法,提供增加日志写文件方式的入口。相关的配置来自appsettings.json
public static class FileLoggerExtensions { //add 日志文件创建规则,分割规则,格式化规则,过滤规则 to appsettings.json public static ILoggerFactory AddFile(this ILoggerFactory factory, IConfiguration configuration) { return AddFile(factory, new FileLoggerSettings(configuration)); } public static ILoggerFactory AddFile(this ILoggerFactory factory, FileLoggerSettings fileLoggerSettings) { factory.AddProvider(new FileLoggerProvider(fileLoggerSettings)); return factory; } }
第二步:实现我们的logger提供程序,实现ILoggerProvider接口
public class FileLoggerProvider : ILoggerProvider, Idisposable
关键方法CreateLogger,创建真正写日志的logger。对当前的logger可以做适当的缓存,配置logger
public class FileLoggerProvider : ILoggerProvider, IDisposable { FileLoggerSettings _configuration; readonly ConcurrentDictionary<string, InitLoggerModel> _loggerKeys = new ConcurrentDictionary<string, InitLoggerModel>(); readonly ConcurrentDictionary<string, FileLogger> _loggers = new ConcurrentDictionary<string, FileLogger>(); public FileLoggerProvider(FileLoggerSettings configuration) { _configuration = configuration; _configuration.ChangeToken.RegisterChangeCallback(p => { //appsettings.json changed. reload settings. _configuration.Reload(); //update loggers settings form new settings foreach (var item in this._loggers.Values) { InitLoggerModel model = new InitLoggerModel(); InitLoggerSettings(item.Name, model); InitLogger(model, item); } }, null); } public ILogger CreateLogger(string categoryName) { var loggerKey = this._loggerKeys.GetOrAdd(categoryName, p => { InitLoggerModel model = new InitLoggerModel(); InitLoggerSettings(categoryName, model); return model; }); var key = loggerKey.FileDiretoryPath + loggerKey.FileNameTemplate; return this._loggers.GetOrAdd(key, p => { var logger = new FileLogger(categoryName); InitLogger(loggerKey, logger); return logger; }); } private static void InitLogger(InitLoggerModel model, FileLogger logger) { logger.FileNameTemplate = model.FileNameTemplate; logger.FileDiretoryPath = model.FileDiretoryPath; logger.MinLevel = model.MinLevel; } class InitLoggerModel { public LogLevel MinLevel { get; set; } public string FileDiretoryPath { get; set; } public string FileNameTemplate { get; set; } public override int GetHashCode() { return this.MinLevel.GetHashCode() + this.FileDiretoryPath.GetHashCode() + this.FileNameTemplate.GetHashCode(); } public override bool Equals(object obj) { var b = obj as InitLoggerModel; if (b == null) return false; return this.MinLevel == b.MinLevel && this.FileDiretoryPath == b.FileDiretoryPath && this.FileNameTemplate == b.FileNameTemplate; } } private void InitLoggerSettings(string categoryName, InitLoggerModel model) { model.MinLevel = LogLevel.Debug; var keys = this.GetKeys(categoryName); foreach (var item in keys) { var switchV = _configuration.GetSwitch(item); if (switchV.Item1) { model.MinLevel = switchV.Item2; break; } } model.FileDiretoryPath = this._configuration.DefaultPath; foreach (var item in keys) { var switchV = _configuration.GetDiretoryPath(item); if (switchV.Item1) { model.FileDiretoryPath = switchV.Item2; break; } } model.FileNameTemplate = this._configuration.DefaultFileName; foreach (var item in keys) { var switchV = _configuration.GetFileName(item); if (switchV.Item1) { model.FileNameTemplate = switchV.Item2; break; } } } IEnumerable<string> GetKeys(string categoryName) { while (!String.IsNullOrEmpty(categoryName)) { // a.b.c //--result // a.b.c,a.b,a,Default yield return categoryName; var last = categoryName.LastIndexOf('.'); if (last <= 0) { yield return "Default"; yield break; } System.Diagnostics.Debug.WriteLine(categoryName + "--" + last); categoryName = categoryName.Substring(0, last); } yield break; } public void Dispose() { } }
第三步:实现我们的logger,实现ILogger接口。真正将log写入file
public class FileLogger : Ilogger
public class FileLogger : ILogger { static protected string delimiter = new string(new char[] { (char)1 }); public FileLogger(string categoryName) { this.Name = categoryName; } class Disposable : IDisposable { public void Dispose() { } } Disposable _DisposableInstance = new Disposable(); public IDisposable BeginScope<TState>(TState state) { return _DisposableInstance; } public bool IsEnabled(LogLevel logLevel) { return this.MinLevel <= logLevel; } public void Reload() { _Expires = true; } public string Name { get; private set; } public LogLevel MinLevel { get; set; } public string FileDiretoryPath { get; set; } public string FileNameTemplate { get; set; } public void Log<TState>(LogLevel logLevel, EventId eventId, TState state, Exception exception, Func<TState, Exception, string> formatter) { if (!this.IsEnabled(logLevel)) return; var msg = formatter(state, exception); this.Write(logLevel, eventId, msg, exception); } void Write(LogLevel logLevel, EventId eventId, string message, Exception ex) { EnsureInitFile(); //TODO 提高效率 队列写!!! var log = String.Concat(DateTime.Now.ToString("HH:mm:ss"), '[', logLevel.ToString(), ']', '[', Thread.CurrentThread.ManagedThreadId.ToString(), ',', eventId.Id.ToString(), ',', eventId.Name, ']', delimiter, message, delimiter, ex?.ToString()); lock (this) { this._sw.WriteLine(log); } } bool _Expires = true; string _FileName; protected StreamWriter _sw; void EnsureInitFile() { if (CheckNeedCreateNewFile()) { lock (this) { if (CheckNeedCreateNewFile()) { InitFile(); _Expires = false; } } } } bool CheckNeedCreateNewFile() { if (_Expires) { return true; } //TODO 使用 RollingType判断是否需要创建文件。提高效率!!! if (_FileName != DateTime.Now.ToString(this.FileNameTemplate)) { return true; } return false; } void InitFile() { if (!Directory.Exists(this.FileDiretoryPath)) { Directory.CreateDirectory(this.FileDiretoryPath); } var path = ""; int i = 0; do { _FileName = DateTime.Now.ToString(this.FileNameTemplate); path = Path.Combine(this.FileDiretoryPath, _FileName + "_" + i + ".log"); i++; } while (System.IO.File.Exists(path)); var oldsw = _sw; _sw = new StreamWriter(new FileStream(path, FileMode.CreateNew, FileAccess.ReadWrite, FileShare.Read), Encoding.UTF8); _sw.AutoFlush = true; if (oldsw != null) { try { _sw.Flush(); _sw.Dispose(); } catch { } } } }
到此这篇关于.Net Core使用Logger实现log写入本地文件系统的文章就介绍到这了。希望对大家的学习有所帮助,也希望大家多多支持脚本之家。
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