Created
March 15, 2021 23:13
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ASP.NET Core IHostingStartup that as soon as the site has started makes a request to itself then shuts itself down
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using System; | |
using System.Linq; | |
using System.Net.Http; | |
using Microsoft.AspNetCore.Builder; | |
using Microsoft.AspNetCore.Hosting; | |
using Microsoft.AspNetCore.Hosting.Server; | |
using Microsoft.AspNetCore.Hosting.Server.Features; | |
using Microsoft.Extensions.DependencyInjection; | |
using Microsoft.Extensions.Hosting; | |
using Microsoft.Extensions.Logging; | |
[assembly: HostingStartup(typeof(SelfShutdown.ShutdownHostingStartup))] | |
namespace SelfShutdown | |
{ | |
public class ShutdownHostingStartup : IHostingStartup | |
{ | |
public void Configure(IWebHostBuilder builder) | |
{ | |
builder.ConfigureServices(services => | |
{ | |
services.AddTransient<IStartupFilter, ShutdownStartupFilter>(); | |
}); | |
} | |
} | |
public class ShutdownStartupFilter : IStartupFilter | |
{ | |
private readonly IHostApplicationLifetime _appLifetime; | |
private readonly IServerAddressesFeature _serverAddresses; | |
private readonly ILogger<ShutdownStartupFilter> _logger; | |
public ShutdownStartupFilter(IHostApplicationLifetime appLifetime, IServer server, ILogger<ShutdownStartupFilter> logger) | |
{ | |
_appLifetime = appLifetime; | |
_serverAddresses = server.Features.Get<IServerAddressesFeature>(); | |
_logger = logger; | |
} | |
public Action<IApplicationBuilder> Configure(Action<IApplicationBuilder> next) | |
{ | |
return builder => | |
{ | |
_appLifetime.ApplicationStarted.Register(OnApplicationStarted); | |
next(builder); | |
}; | |
} | |
private void OnApplicationStarted() | |
{ | |
// Make a request to the site root to force full initialization | |
var url = _serverAddresses.Addresses.FirstOrDefault(s => s.StartsWith("https://")) | |
?? _serverAddresses.Addresses.FirstOrDefault(s => s.StartsWith("http://")); | |
_logger.LogInformation("App startup completed, initiating request to {url}", url); | |
using var http = new HttpClient(); | |
http.GetStringAsync(url).Wait(); | |
_logger.LogInformation("Request complete, requesting app shutdown"); | |
_appLifetime.StopApplication(); | |
} | |
} | |
} |
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