Saturday, May 18, 2013

MVC - Message Handler

Code to log message received or send from Web API:

 using System;  
 using System.Diagnostics;  
 using System.Net.Http;  
 using System.Text;  
 using System.Threading;  
 using System.Threading.Tasks;  
 namespace Program.Api.Web.ActionFilters  
 {  
   /// <br />  
 <br />  
 <summary>  
   /// Class to log the request/response received from the client  
   /// </summary>  
   public abstract class MessageHandler : DelegatingHandler  
   {  
     protected override async Task<httpresponsemessage> SendAsync(HttpRequestMessage request, CancellationToken cancellationToken)  
     {  
       var corrId = string.Format("{0}{1}", DateTime.Now.Ticks, Thread.CurrentThread.ManagedThreadId);  
       var requestInfo = string.Format("{0} {1}", request.Method, request.RequestUri);  
       var requestMessage = await request.Content.ReadAsByteArrayAsync();  
       await IncommingMessageAsync(corrId, requestInfo, requestMessage);  
       var response = await base.SendAsync(request, cancellationToken);  
       byte[] responseMessage;  
       if (response.IsSuccessStatusCode)  
         responseMessage = await response.Content.ReadAsByteArrayAsync();  
       else  
         responseMessage = Encoding.UTF8.GetBytes(response.ReasonPhrase);  
       await OutgoingMessageAsync(corrId, requestInfo, responseMessage);  
       return response;  
     }  
     protected abstract Task IncommingMessageAsync(string correlationId, string requestInfo, byte[] message);  
     protected abstract Task OutgoingMessageAsync(string correlationId, string requestInfo, byte[] message);  
   }  
   /// <summary>  
   /// The logger class which will log to the database or text file  
   /// </summary>  
   public class MessageLoggingHandler : MessageHandler  
   {  
     protected override async Task IncommingMessageAsync(string correlationId, string requestInfo, byte[] message)  
     {  
       if(WebConfig.LogMessages) // Based on web.config property  
       await Task.Run(() =&gt;  
         Trace.WriteLine(string.Format("{0} - Request: {1}\r\n{2}", correlationId, requestInfo, Encoding.UTF8.GetString(message))));  
     }  
     protected override async Task OutgoingMessageAsync(string correlationId, string requestInfo, byte[] message)  
     {  
       if (WebConfig.LogMessages)  
       await Task.Run(() =&gt;  
         Trace.WriteLine(string.Format("{0} - Response: {1}\r\n{2}", correlationId, requestInfo, Encoding.UTF8.GetString(message))));  
     }  
   }  
 }  

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