.net core webapi通过中间件获取请求和响应内容的方法

本文主要根据中间件来实现对.net core webapi中产生的请求和响应数据进行获取并存入日志文件中；

这里不详细介绍日志文件的使用。你可以自己接入NLog,log4net，Exceptionless等

创建接口记录的中间件

using Microliu.Core.Loggers;

using Microsoft.AspNetCore.Builder;

using Microsoft.AspNetCore.Http;

using Microsoft.AspNetCore.Http.Internal;

using Newtonsoft.Json;

using System;

using System.Collections.Generic;

using System.Diagnostics;

using System.IO;

using System.Linq;

using System.Text;

using System.Threading.Tasks;

namespace Ptibro.Partner.API.Extensions

{

public class RequestResponseLoggingMiddleware

{

private readonly RequestDelegate _next;

private readonly ILogger _logger;

private SortedDictionary<string, object> _data;

private Stopwatch _stopwatch;

public RequestResponseLoggingMiddleware(RequestDelegate next, ILogger logger)

{

_next = next;

_logger = logger;

_stopwatch = new Stopwatch();

}

public async Task Invoke(HttpContext context)

{

_stopwatch.Restart();

_data = new SortedDictionary<string, object>();

HttpRequest request = context.Request;

_data.Add("request.url", request.Path.ToString());

_data.Add("request.headers", request.Headers.ToDictionary(x => x.Key, v => string.Join(";", v.Value.ToList())));

_data.Add("request.method", request.Method);

_data.Add("request.executeStartTime", DateTimeOffset.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));

// 获取请求body内容

if (request.Method.ToLower().Equals("post"))

{

// 启用倒带功能，就可以让 Request.Body 可以再次读取

request.EnableRewind();

Stream stream = request.Body;

byte[] buffer = new byte[request.ContentLength.Value];

stream.Read(buffer, 0, buffer.Length);

_data.Add("request.body", Encoding.UTF8.GetString(buffer));

request.Body.Position = 0;

}

else if (request.Method.ToLower().Equals("get"))

{

_data.Add("request.body", request.QueryString.Value);

}

// 获取Response.Body内容

var originalBodyStream = context.Response.Body;

using (var responseBody = new MemoryStream())

{

context.Response.Body = responseBody;

await _next(context);

_data.Add("response.body", await GetResponse(context.Response));

_data.Add("response.executeEndTime", DateTimeOffset.Now.ToString("yyyy-MM-dd HH:mm:ss.fff"));

await responseBody.CopyToAsync(originalBodyStream);

}

// 响应完成记录时间和存入日志

context.Response.OnCompleted(() =>

{

_stopwatch.Stop();

_data.Add("elaspedTime", _stopwatch.ElapsedMilliseconds + "ms");

var json = JsonConvert.SerializeObject(_data);

_logger.Debug(json, "api", request.Method.ToUpper());

return Task.CompletedTask;

});

}

/// <summary>

/// 获取响应内容

/// </summary>

/// <param name="response"></param>

/// <returns></returns>

public async Task<string> GetResponse(HttpResponse response)

{

response.Body.Seek(0, SeekOrigin.Begin);

var text = await new StreamReader(response.Body).ReadToEndAsync();

response.Body.Seek(0, SeekOrigin.Begin);

return text;

}

/// <summary>

/// 扩展中间件

/// </summary>

public static class RequestResponseLoggingMiddlewareExtensions

{

public static IApplicationBuilder UseRequestResponseLogging(this IApplicationBuilder app)

{

return app.UseMiddleware<RequestResponseLoggingMiddleware>();

}

在startup.cs中Configure方法中使用中间件

.net core webapi通过中间件获取请求和响应内容的方法

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