[英]Reload Serilog JSON Configuration on changes in .NET Core 2.1
我目前正在开发一个 ASP.NET Core 2.1 应用程序,我使用 Serilog 进行日志记录。 我想在运行时为我的 Serilog 实现重新加载应用程序设置文件。
我的目标是在运行时更改日志级别,例如我写入 minimumLevel Debug而不是Information并保存文件。 我想触发设置的实时重新加载。 我的appsettings.json
看起来像这样:
{
"serilog": {
"using": [ "Serilog.Sinks.File", "Serilog.Sinks.Console" ],
"minimumLevel": "Information",
"writeTo": [
{
"name": "File",
"args": {
"fileSizeLimitBytes": 256000000,
"retainedFileCountLimit": 62,
"rollingInterval": "Day",
"rollOnFileSizeLimit": true,
},
{
"name": "Console",
}
]
}
}
在我的Program.cs 中,我使用标志reloadOnChange: true
加载设置。
public class Program
{
public static readonly ServiceSettings Settings = new ServiceSettings();
public static void Main(string[] args)
{
//...
}
public static IWebHostBuilder CreateWebHostBuilder(string[] args)
{
var config = new ConfigurationBuilder()
.SetBasePath(Directory.GetCurrentDirectory())
.AddJsonFile(Path.GetFullPath(CoreServiceBase.Instance.ConfigFilePath), optional: false, reloadOnChange: true)
.AddCommandLine(args)
.Build();
config.Bind(Settings);
return WebHost.CreateDefaultBuilder(args)
.UseStartup<Startup>()
.UseSerilog((hostingContext, loggerConfiguration) =>
loggerConfiguration.ReadFrom.Configuration(hostingContext.Configuration))
.UseConfiguration(config);
}
}
我的启动看起来像这样:
public class Startup
{
public Startup(IConfiguration configuration)
{
Configuration = configuration;
}
public IConfiguration Configuration { get; }
public void ConfigureServices(IServiceCollection services)
{
// ...
}
public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
{
// Custom application logging
ApplicationLogging.LoggerFactory = loggerFactory;
// ...
}
}
如果我以某种方式更改了 appsettings.json,您知道如何在运行时重新加载 Serilog 配置。 => 实时重新加载 appsettings.json。
谢谢!!
您可以使用Serilog.Settings.Reloader
我没有 ASP 示例,但在控制台程序上你可以这样做:
// Service collection
IServiceCollection serviceCollection = new ServiceCollection()
.AddLogging(loggingBuilder =>
loggingBuilder
.AddSerilog(SwitchableLogger.Instance, true)
.AddSerilogConfigurationLoader(configuration, SwitchableLogger.Instance)
);
// Services
using (var services = serviceCollection.BuildServiceProvider())
{
// Create logger
Microsoft.Extensions.Logging.ILogger logger = services.GetService<Microsoft.Extensions.Logging.ILogger<Program>>();
// Write
logger.LogInformation("Hello World");
// Modify config
config.Set("Serilog:WriteTo:0:Args:OutputTemplate", "[{SourceContext}] {Message:lj}{NewLine}{Exception}");
configuration.Reload();
// Write with the previous logger instance, but with different settings
logger.LogInformation("Hello world again");
}
当前的 Serilog 实现 (2.9.0) 无法完全重新加载设置。 要在不引入其他依赖项的情况下解决此问题,请避免创建静态记录器并按照此处提供的示例进行操作: https : //github.com/akovac35/Logging/blob/v1.0.4/src/com.github.akovac35.Logging.Serilog /SerilogHelper.cs
public static void CreateLogger()
{
CreateLogger(configure =>
{
configure.AddJsonFile("serilog.json", optional: false, reloadOnChange: true);
});
}
public static void CreateLogger(Action<IConfigurationBuilder> configure)
{
if (configure == null) throw new ArgumentNullException(nameof(configure));
UpdateLogger(configure);
}
public static void UpdateLogger(Action<IConfigurationBuilder> configure)
{
if (configure == null) throw new ArgumentNullException(nameof(configure));
// The following pattern fires the reload token only once per settings change
var configurationBuilder = new ConfigurationBuilder();
try
{
configure(configurationBuilder);
IConfiguration configuration = configurationBuilder.Build();
// Release previous callback - will be released only if this line is reached, allowing for another reload
_changeCallback?.Dispose();
_changeCallback = null;
// .NET will not trigger a reload for invalid config file format, so reaching this line signals Json is OK
_changeCallback = configuration.GetReloadToken().RegisterChangeCallback(state =>
{
UpdateLogger(configure);
}, null);
// Reading configuration will fail for invalid properties, that is why reload registration must happen
// before this line or subsequent file updates may not be detected
global::Serilog.ILogger newLogger = new LoggerConfiguration()
.ReadFrom.Configuration(configuration)
.Enrich.FromLogContext()
.CreateLogger();
Log.Logger = newLogger;
GetLogger().Here(l => l.LogInformation("Updated logger: {@configuration}", configuration));
}
catch (Exception ex)
{
GetLogger().Here(l => l.LogError(ex, ex.Message));
}
}
或者你可以简单地使用Logging.Serilog库,它为此提供了实用功能。
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