iot/projects/Platform/Program.cs

using Microsoft.AspNetCore;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Serilog;
using Serilog.Formatting.Elasticsearch;
using Serilog.Formatting.Json;
using Serilog.Settings.Configuration;
using Serilog.Sinks.Elasticsearch;
using Serilog.Sinks.RollingFile;
using System;
using System.IO;
using System.Text;

namespace Platform
{
    public class Program
    {
        public static void Main(string[] args)
        {
            Console.OutputEncoding = Encoding.UTF8;
            IConfigurationRoot config = GetConfig();
            Log.Logger = GetLogger(config);

            try
            {
                Log.Information("web host start");
                WebHost.CreateDefaultBuilder(args)
                .UseConfiguration(config)
                .UseSerilog()
                .UseStartup<Startup>()
                .Build()
                .Run();
                Log.Information("web host end");
            }
            catch (Exception ex)
            {
                Log.Fatal(ex, "Host terminated unexpectedly");
                return;
            }
            finally
            {
                Log.CloseAndFlush();
            }
        }

        private static IConfigurationRoot GetConfig()
        {
            return new ConfigurationBuilder().SetBasePath(Directory.GetCurrentDirectory())
                .AddJsonFile("appsettings.json", optional: true, reloadOnChange: true)
                .AddJsonFile($"appsettings.{Environment.GetEnvironmentVariable("ASPNETCORE_ENVIRONMENT")}.json", optional: true, reloadOnChange: true)
                .Build();
        }

        private static ILogger GetLogger(IConfigurationRoot config)
        {
            return new LoggerConfiguration()
                .ReadFrom.Configuration(config, ConfigurationAssemblySource.AlwaysScanDllFiles)
                .WriteTo.Console()
                .WriteTo.Elasticsearch(new ElasticsearchSinkOptions(new Uri(config.GetConnectionString("Log")))
                {
                    AutoRegisterTemplate = true,
                    AutoRegisterTemplateVersion = AutoRegisterTemplateVersion.ESv7,
                    CustomFormatter = new ExceptionAsObjectJsonFormatter(renderMessage: true),
                    FailureCallback = e => Console.WriteLine("Unable to submit event " + e.MessageTemplate),
                    EmitEventFailure = EmitEventFailureHandling.WriteToSelfLog |EmitEventFailureHandling.WriteToFailureSink | EmitEventFailureHandling.RaiseCallback,
                    FailureSink = new RollingFileSink("logs/log.json", new JsonFormatter(), 100 * 1024 * 1024, 1, Encoding.UTF8)
                })
                .CreateLogger();
        }
    }
}