.net core 3.0 logging middleware by pipereader

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I have migrated my source code to .net core 3.0. I had a middleware to log request and response of api request.
This middleware used stream (HttpContext.Request.Body and HttpContext.Response.Body) to get json request and response data.

Now I want to replace the stream by PipeReader (HttpContext.Request.BodyReader). I am able to get the request data, but my request body does not validated. I am receiving following error.

"errors": {
"$": [
  "The input does not contain any JSON tokens. Expected the input to start with a valid JSON token, when isFinalBlock is true. Path: $ | LineNumber: 0 | BytePositionInLine: 0."
],

I guess at some point, I have to reset the position of the request body. (I am not sure).

For reference I am uploading the sample project on One drive Sample Project.
Please I need to fix the issue discussed above.
Also please guide me how to log the response data. Should I use the stream as I did in .net core 2.2?

What I have tried:

I tried to Reset the HttpRequest.Body stream to intial position. But get an error, as this is readyonly stream.

I tried to use HttpRequest.EnableBuffering(), but i received exception of disposed object. (HttpRequest.EnbleBuffering() can be used with stream. Therefore it is not valid option).

If i disable to LogRequest() method, then the middleware works fine.

Posted 17-Nov-19 19:53pm

M.Kamran Asim

Updated 18-Dec-19 5:48am

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wkchee · Accepted Answer · 2019-12-18T05:49:00

Solution 1

By default, the stream will be closed after read, hence threw an exception of disposed object. Hence, got to obtain the BodyReader with leaveOpen flag set to true.

var body = request.BodyReader.AsStream(true);
using var streamReader = new StreamReader(body);

Posted 18-Dec-19 5:49am

wkchee