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ASP.NET Core中间件计算Http请求时间示例详解

muchengxin 2019-06-23 11:34 1051 查看

ASP.NET Core通过RequestDelegate这个委托类型来定义中间件

public delegate Task RequestDelegate(HttpContext context);

可将一个单独的请求委托并行指定为匿名方法(称为并行中间件),或在类中对其进行定义。可通过Use,或在Middleware类中配置要传递给委托执行的方法(参数类型HttpContext,返回值类型Task)。

public static IApplicationBuilder Use(this IApplicationBuilder app, Func<HttpContext, Func<Task>, Task> middleware);

public static IApplicationBuilder UseMiddleware<TMiddleware>(this IApplicationBuilder app, params object[] args);

通过定义一个中间件类 来计算http请求的时间,例:

public class ResponseTimeMiddleware
{
// Name of the Response Header, Custom Headers starts with "X-"
private const string RESPONSE_HEADER_RESPONSE_TIME = "X-Response-Time-ms";
// Handle to the next Middleware in the pipeline
private readonly RequestDelegate _next;
public ResponseTimeMiddleware(RequestDelegate next)
{
_next = next;
}
public Task InvokeAsync(HttpContext context)
{
// Start the Timer using Stopwatch
var watch = new Stopwatch();
watch.Start();
context.Response.OnStarting(() => {
// Stop the timer information and calculate the time
watch.Stop();
var responseTimeForCompleteRequest = watch.ElapsedMilliseconds;
// Add the Response time information in the Response headers.
context.Response.Headers[RESPONSE_HEADER_RESPONSE_TIME] = responseTimeForCompleteRequest.ToString();
return Task.CompletedTask;
});
// Call the next delegate/middleware in the pipeline
return this._next(context);
}
}

总结

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标签:  core 中间件 http请求