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Teknik/WebCommon/Middleware/PerformanceMonitorMiddleware.cs

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C#
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using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Teknik.Configuration;
using Teknik.Utilities;
namespace Teknik.WebCommon.Middleware
{
// You may need to install the Microsoft.AspNetCore.Http.Abstractions package into your project
public class PerformanceMonitorMiddleware
{
private readonly RequestDelegate _next;
public PerformanceMonitorMiddleware(RequestDelegate next)
{
_next = next;
}
public async Task Invoke(HttpContext httpContext, Config config)
{
Stopwatch timer = new Stopwatch();
timer.Start();
httpContext.Response.OnStarting(state =>
{
var context = (HttpContext)state;
timer.Stop();
double ms = (double)timer.ElapsedMilliseconds;
string result = string.Format("{0:F0}", ms);
if (!httpContext.Response.Headers.IsReadOnly)
httpContext.Response.Headers.Add("GenerationTime", result);
return Task.CompletedTask;
}, httpContext);
await _next(httpContext);
// Don't interfere with non-HTML responses
if (httpContext.Response.ContentType != null && httpContext.Response.ContentType.StartsWith("text/html") && httpContext.Response.StatusCode == 200 && !httpContext.Request.IsAjaxRequest())
{
double ms = (double)timer.ElapsedMilliseconds;
string result = string.Format("{0:F0}", ms);
await httpContext.Response.WriteAsync(
"<script nonce=\"" + httpContext.Items[Constants.NONCE_KEY] + "\">" +
"var pageGenerationTime = '" + result + "';" +
"pageloadStopTimer();" +
"</script >");
}
}
}
// Extension method used to add the middleware to the HTTP request pipeline.
public static class PerformanceMonitorMiddlewareExtensions
{
public static IApplicationBuilder UsePerformanceMonitor(this IApplicationBuilder builder)
{
return builder.UseMiddleware<PerformanceMonitorMiddleware>();
}
}
}