Serilog and Seq works fine when I log from WinForm/web application. I am facing problem only when I am using console application. Without writing Log.CloseAndFlush() it is not working. Following is my LoggerConfiguration
Log.Logger = new LoggerConfiguration() .WriteTo.Seq("") .CreateLogger(); Is there any way to log without invoking Log.CloseAndFlush() so that it works with seq, serilog in console application.
2 Answers
Log.CloseAndFlush() only needs to be called once in a console application, before the application exits. It's a "shutdown" method that ensures any buffered events are processed before the application exits.
The Serilog Lifecycle of Loggers documentation has some more detail on CloseAndFlush().
Just tried to understand why Dispose() or CloseAndFlush() not works for AWS Lambda function. And looks like, that Dispose/CloseAndFlush has no guarantee, that all buffered events will be sent during calling this method. Sic!
Here we can see confirmation of such behaviour:
public async Task<string> FunctionHandler(JObject input, ILambdaContext context) { var logger = LogService.GetInstance(); //wrapped Logger instance try { throw new ApplicationException("lambda test error"); } catch (Exception e) { Console.WriteLine(e); logger.Error(e, "AWS_Lambda call failed"); } logger.Dispose(); // here CloseAndFlush or dispose calling (tried both variants) Thread.Sleep(3000); //not work without it return input.ToString().ToUpper(); } So, you can just call Thread.Sleep(3000) to hold 2-3 seconds that ... MAYBE will send all logs to your sinks. Not an option for AWS Lambdas of course, so if someone will find a working solution, put it here, please. Thanks!
Possible workaround : Just one solution see here : making this thread delay in case during request/lifecycle you collected some logs in general, so in my case I just set bool flag to true in case of any logging and then checking it before lambda will be finished, if it is true - making thread sleep to allow logs be pushed.Weird, but works well... And of course you need to control that it should happens only for exceptions or other words - rare.
