For logging whole request and response in the ASP.NET Core filter pipeline you can use Result filter attribute
public class LogRequestResponseAttribute : TypeFilterAttribute
{
public LogRequestResponseAttribute() : base(typeof(LogRequestResponseImplementation)) { }
private class LogRequestResponseImplementation : IAsyncResultFilter
{
public async Task OnResultExecutionAsync(ResultExecutingContext context, ResultExecutionDelegate next)
{
var requestHeadersText = CommonLoggingTools.SerializeHeaders(context.HttpContext.Request.Headers);
Log.Information("requestHeaders: " + requestHeadersText);
var requestBodyText = await CommonLoggingTools.FormatRequestBody(context.HttpContext.Request);
Log.Information("requestBody: " + requestBodyText);
await next();
var responseHeadersText = CommonLoggingTools.SerializeHeaders(context.HttpContext.Response.Headers);
Log.Information("responseHeaders: " + responseHeadersText);
var responseBodyText = await CommonLoggingTools.FormatResponseBody(context.HttpContext.Response);
Log.Information("responseBody: " + responseBodyText);
}
}
}
In Startup.cs add
app.UseMiddleware<ResponseRewindMiddleware>();
services.AddScoped<LogRequestResponseAttribute>();
Somewhere add static class
public static class CommonLoggingTools
{
public static async Task<string> FormatRequestBody(HttpRequest request)
{
//This line allows us to set the reader for the request back at the beginning of its stream.
request.EnableRewind();
//We now need to read the request stream. First, we create a new byte[] with the same length as the request stream...
var buffer = new byte[Convert.ToInt32(request.ContentLength)];
//...Then we copy the entire request stream into the new buffer.
await request.Body.ReadAsync(buffer, 0, buffer.Length).ConfigureAwait(false);
//We convert the byte[] into a string using UTF8 encoding...
var bodyAsText = Encoding.UTF8.GetString(buffer);
//..and finally, assign the read body back to the request body, which is allowed because of EnableRewind()
request.Body.Position = 0;
return $"{request.Scheme} {request.Host}{request.Path} {request.QueryString} {bodyAsText}";
}
public static async Task<string> FormatResponseBody(HttpResponse response)
{
//We need to read the response stream from the beginning...
response.Body.Seek(0, SeekOrigin.Begin);
//...and copy it into a string
string text = await new StreamReader(response.Body).ReadToEndAsync();
//We need to reset the reader for the response so that the client can read it.
response.Body.Seek(0, SeekOrigin.Begin);
response.Body.Position = 0;
//Return the string for the response, including the status code (e.g. 200, 404, 401, etc.)
return $"{response.StatusCode}: {text}";
}
public static string SerializeHeaders(IHeaderDictionary headers)
{
var dict = new Dictionary<string, string>();
foreach (var item in headers.ToList())
{
//if (item.Value != null)
//{
var header = string.Empty;
foreach (var value in item.Value)
{
header += value + " ";
}
// Trim the trailing space and add item to the dictionary
header = header.TrimEnd(" ".ToCharArray());
dict.Add(item.Key, header);
//}
}
return JsonConvert.SerializeObject(dict, Formatting.Indented);
}
}
public class ResponseRewindMiddleware {
private readonly RequestDelegate next;
public ResponseRewindMiddleware(RequestDelegate next) {
this.next = next;
}
public async Task Invoke(HttpContext context) {
Stream originalBody = context.Response.Body;
try {
using (var memStream = new MemoryStream()) {
context.Response.Body = memStream;
await next(context);
//memStream.Position = 0;
//string responseBody = new StreamReader(memStream).ReadToEnd();
memStream.Position = 0;
await memStream.CopyToAsync(originalBody);
}
} finally {
context.Response.Body = originalBody;
}
}
context.Resultcould be much more elegant. – Fascinator