c# - 请求/响应日志记录的响应正文

Question

我正在尝试编写一个 Owin 中间件组件，它将记录每个传入的请求和对数据库的响应。

这是我设法取得的进展。

我在阅读 response.body 时卡住了。说:

Stream does not support reading.

如何阅读 Response.Body ？

 public class LoggingMiddleware : OwinMiddleware
 {
        private static Logger log = LogManager.GetLogger("WebApi");

        public LoggingMiddleware(OwinMiddleware next, IAppBuilder app)
            : base(next)
        {
        }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

            var sw = new Stopwatch();
            sw.Start();

            var logRequest = new log_Request
            {
                Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,
                Headers = Json.Encode(context.Request.Headers),
                IPTo = context.Request.LocalIpAddress,
                IpFrom = context.Request.RemoteIpAddress,
                Method = context.Request.Method,
                Service = "Api",
                Uri = context.Request.Uri.ToString(),
                UserName = context.Request.User.Identity.Name

            };
            db.log_Request.Add(logRequest);
            context.Request.Body.Position = 0;

            await Next.Invoke(context);

            var mem2 = new MemoryStream();
            await context.Response.Body.CopyToAsync(mem2);

            var logResponse = new log_Response
            {
                Headers = Json.Encode(context.Response.Headers),
                Body = new StreamReader(mem2).ReadToEndAsync().Result,
                ProcessingTime = sw.Elapsed,
                ResultCode = context.Response.StatusCode,
                log_Request = logRequest
            };

            db.log_Response.Add(logResponse);

            await db.SaveChangesAsync();
        }
    }
}

Answer 1

Response Body 可以这样记录:

public class LoggingMiddleware : OwinMiddleware
{
    private static Logger log = LogManager.GetLogger("WebApi");

    public LoggingMiddleware(OwinMiddleware next, IAppBuilder app)
        : base(next)
    {
    }

    public override async Task Invoke(IOwinContext context)
    {
        using (var db = new HermesEntities())
        {

           var sw = new Stopwatch();
           sw.Start();

           var logRequest = new log_Request
           {
               Body = new StreamReader(context.Request.Body).ReadToEndAsync().Result,
               Headers = Json.Encode(context.Request.Headers),
               IPTo = context.Request.LocalIpAddress,
               IpFrom = context.Request.RemoteIpAddress,
               Method = context.Request.Method,
               Service = "Api",
               Uri = context.Request.Uri.ToString(),
               UserName = context.Request.User.Identity.Name
           };

           db.log_Request.Add(logRequest);
           context.Request.Body.Position = 0;

           Stream stream = context.Response.Body;
           MemoryStream responseBuffer = new MemoryStream();
           context.Response.Body = responseBuffer;

           await Next.Invoke(context);

           responseBuffer.Seek(0, SeekOrigin.Begin);
           var responseBody = new StreamReader(responseBuffer).ReadToEnd();

           //do logging

           var logResponse = new log_Response
           {
               Headers = Json.Encode(context.Response.Headers),
               Body = responseBody,
               ProcessingTime = sw.Elapsed,
               ResultCode = context.Response.StatusCode,
               log_Request = logRequest
           };

           db.log_Response.Add(logResponse);

           responseBuffer.Seek(0, SeekOrigin.Begin);
           await responseBuffer.CopyToAsync(stream);

           await db.SaveChangesAsync();
        }
    }
}