/// <summary>
        /// Occurs when a request is received
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        protected virtual void OnRequestReceived(object sender, HttpRequestCancelEventArgs e)
        {
            // dispatch the request out to be handled
            if (_dispatcher != null)
            {
                _dispatcher.DispatchRequest(sender, ref e);
            }
            else
            {
                Debug.WriteLine(string.Format("Received a message, however there is no dispatcher available to handle the message for connection '{0}'.", _id.ToString()));
            }

            // did someone cancel the request?
            if (e.Cancel)
            {
                return;                 // do not send a response, some will have done this manually
            }

            /*
             * IMPORTANT!!! - We are providing a mechanism to override the default HTTP/1.1 specification's behaviour.
             * The specs state explicitly under all conditions a response must be sent to a request. We have certain scenarious where
             * we only need to send a request, no further processing is required as to the result of the request by the user-agent, so
             * the 'Reponse-Needed' header can be included to prevent the 'Server' from responding to the request.
             * */
            if (e.Request.ResponseNeeded)
            {
                // if there is a response prepared let's send it now
                HttpRequest  request  = e.Request;
                HttpResponse response = e.Response;

                // send a response to the request
                this.SendResponseToRequest(ref request, ref response);
            }
        }
Пример #2
0
        /// <summary>
        /// Dispatches the request to each handler registered to receive notification of this request's method
        /// </summary>
        /// <param name="dispatcher"></param>
        /// <param name="request"></param>
        /// <param name="sender"></param>
        /// <param name="cancel"></param>
        private Delegate[] InternalDispatchRequest(object sender, ref HttpRequestCancelEventArgs e)
        {
            // look up the list of handlers for the specified hook point, and then look up the method in that list to
            Hashtable requestHandlers = this[HttpRequestHookPoints.BeforeHttpRuntimeProcessing];

            // receive the list of handlers that is handling callback notification for methods in that list
            EventHandler <HttpRequestCancelEventArgs> handlers = requestHandlers[e.Request.Method] as EventHandler <HttpRequestCancelEventArgs>;

            // there is a list of handlers waiting to be notified
            if (handlers == null)
            {
                return new Delegate[] {}
            }
            ;

            // extract the list of handlers to be notified when this method is received
            Delegate[] delegates = handlers.GetInvocationList();
            if (delegates == null)
            {
                return new Delegate[] {}
            }
            ;

            // enumerate each handler
            foreach (Delegate d in delegates)
            {
                try
                {
                    // notify the handler
                    ((EventHandler <HttpRequestCancelEventArgs>)d)(sender, e);

                    // someone may have created a response that is ready to be sent for this event so no further processing is required
                    if (e.Response != null)
                    {
                        return(delegates);
                    }

                    // someone may have handled the request manually and there for this event is cancelled and no further processing is required
                    if (e.Cancel)
                    {
                        return(delegates);
                    }
                }
                catch (Exception ex)
                {
                    Debug.WriteLine(ex);
                }
            }

            return(delegates);
        }
		/// <summary>
		/// Dispatches the request to each handler registered to receive notification of this request's method
		/// </summary>
		/// <param name="dispatcher"></param>
		/// <param name="request"></param>
		/// <param name="sender"></param>
		/// <param name="cancel"></param>
		private Delegate[] InternalDispatchRequest(object sender, ref HttpRequestCancelEventArgs e)
		{
			// look up the list of handlers for the specified hook point, and then look up the method in that list to 
			Hashtable requestHandlers = this[HttpRequestHookPoints.BeforeHttpRuntimeProcessing];

			// receive the list of handlers that is handling callback notification for methods in that list
			EventHandler<HttpRequestCancelEventArgs> handlers = requestHandlers[e.Request.Method] as EventHandler<HttpRequestCancelEventArgs>;

			// there is a list of handlers waiting to be notified
			if (handlers == null)				
				return new Delegate[] {};
						
			// extract the list of handlers to be notified when this method is received
			Delegate[] delegates = handlers.GetInvocationList();
			if (delegates == null)
				return new Delegate[] {};
									
			// enumerate each handler
			foreach(Delegate d in delegates)
			{
				try
				{
					// notify the handler
					((EventHandler<HttpRequestCancelEventArgs>)d)(sender, e);

					// someone may have created a response that is ready to be sent for this event so no further processing is required
					if (e.Response != null)
						return delegates;					

					// someone may have handled the request manually and there for this event is cancelled and no further processing is required
					if (e.Cancel)					
						return delegates;										
				}
				catch(Exception ex)
				{
					Debug.WriteLine(ex);
				}
			}

			return delegates;
		}
//		/// <summary>
//		/// Unregisters for notification for when the specified method is received in a HttpRequest
//		/// </summary>
//		/// <param name="method">The method notification was registered for</param>
//		/// <param name="onRequest">The callback to be notified when/if the method is received</param>
//		public void UnregisterForRequestMethodNotification(string method, HttpRequestEventHandler onRequest)
//		{
//			// we must have a valid method
//			HttpUtils.ValidateToken(@"method", method);	
//			
//			// and we must have a valid callback
//			if (onRequest == null)
//				throw new ArgumentNullException("onRequest");
//
//			// look up the list of handlers for the specified hook point, and then look up the method in that list to 
//			Hashtable requestHandlers = this[HttpRequestHookPoints.AfterHttpRuntimeProcessing];
//
//			// receive the list of handlers that is handling callback notification for methods in that list
//			HttpRequestEventHandler handlers = requestHandlers[method] as HttpRequestEventHandler;
//
//			// if the handler list is null
//			if (handlers != null)
//				// add the handlers into the list by the method we're registering for
//				handlers = (HttpRequestEventHandler)Delegate.Remove(handlers, onRequest);
//
//			// if there are still some handlers, and the list is zero length, remove the list entirely
//			if (handlers != null)
//				if (handlers.GetInvocationList().Length == 0)
//				{
//					requestHandlers.Remove(method);
//					return;
//				}
//			
//			// save the list of handlers for the next guy
//			requestHandlers[method] = handlers;
//		}

		/// <summary>
		/// Dispatches the HttpRequest to the registered handlers for processing. If no response is created or sent, then a default response will be prepared.
		/// </summary>
		/// <param name="dispatcher"></param>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		public void DispatchRequest(object sender, ref HttpRequestCancelEventArgs e)
		{
//			Debug.WriteLine(string.Format("Dispatching request '{0}'.", e.Request.Method));

			// internally dispatch the request to the registered handler(s) until someone responds to the request
			Delegate[] delegates = this.InternalDispatchRequest(sender, ref e);
						
			if (!e.Cancel && e.Response == null)
			{			
				#region Asp Processing

				// if we have an asp host
				if (_aspHost != null)
				{
					bool alreadyRetried = false;
				
				RetryAspProcessing:
				
					try
					{
						// use the asp host to process the request
						_aspHost.ProcessRequest((HttpConnection)sender, ref e);
					}
					catch(AppDomainUnloadedException)
					{						
//						Debug.WriteLine(ex);

						// it might have unloaded on us, so we can try once more
						if (!alreadyRetried)
						{
							// recreate the host
							this.CreateAspHost();
							alreadyRetried = true;

							// jump back and try again
							goto RetryAspProcessing;
						}
					}
				}

				#endregion

				// after the asp processing, it might have already sent the response so watch out that it didn't cancel 
				// the remaining processing we had to do
				if (e.Cancel)
					return;

				// and finally if we still have no response for the request, let's fill in which ever is appropriate
				if (e.Response == null)
				{
					// if there are no handlers that were registered for the request's method
					if (delegates.Length == 0)
					{
						// then the method is not allowed
						e.Response = new HttpResponse(new MethodNotAllowedStatus());
						e.Response.SetBodyFromString(string.Format("405 - The '{0}' method is not allowed.\nThe request for the '{1}' resource cannot be processed.", e.Request.Method, e.Request.RequestUri), HttpUtils.Encoding, MIME.Text.Plain);
					}
					else
					{
						// resource not found (there was a handler but it didn't respond) so obviously the resource couldn't be found
						e.Response = new HttpResponse(new NotFoundStatus());
						e.Response.SetBodyFromString(string.Format("404 - The resource '{0}' could not be found.", e.Request.RequestUri), HttpUtils.Encoding, MIME.Text.Plain);
					}
				}
			}			
		}
		/// <summary>
		/// Occurs when a request is received
		/// </summary>
		/// <param name="sender"></param>
		/// <param name="e"></param>
		protected virtual void OnRequestReceived(object sender, HttpRequestCancelEventArgs e)
		{	
			// dispatch the request out to be handled
			if (_dispatcher != null)
				_dispatcher.DispatchRequest(sender, ref e);
            else
				Debug.WriteLine(string.Format("Received a message, however there is no dispatcher available to handle the message for connection '{0}'.", _id.ToString()));

			// did someone cancel the request?
			if (e.Cancel)
				return; // do not send a response, some will have done this manually

			/*
			 * IMPORTANT!!! - We are providing a mechanism to override the default HTTP/1.1 specification's behaviour.
			 * The specs state explicitly under all conditions a response must be sent to a request. We have certain scenarious where
			 * we only need to send a request, no further processing is required as to the result of the request by the user-agent, so
			 * the 'Reponse-Needed' header can be included to prevent the 'Server' from responding to the request.
			 * */ 			 
			if (e.Request.ResponseNeeded)
			{
				// if there is a response prepared let's send it now
				HttpRequest request = e.Request;
				HttpResponse response = e.Response;

				// send a response to the request
				this.SendResponseToRequest(ref request, ref response);
			}
		}
Пример #6
0
//		/// <summary>
//		/// Unregisters for notification for when the specified method is received in a HttpRequest
//		/// </summary>
//		/// <param name="method">The method notification was registered for</param>
//		/// <param name="onRequest">The callback to be notified when/if the method is received</param>
//		public void UnregisterForRequestMethodNotification(string method, HttpRequestEventHandler onRequest)
//		{
//			// we must have a valid method
//			HttpUtils.ValidateToken(@"method", method);
//
//			// and we must have a valid callback
//			if (onRequest == null)
//				throw new ArgumentNullException("onRequest");
//
//			// look up the list of handlers for the specified hook point, and then look up the method in that list to
//			Hashtable requestHandlers = this[HttpRequestHookPoints.AfterHttpRuntimeProcessing];
//
//			// receive the list of handlers that is handling callback notification for methods in that list
//			HttpRequestEventHandler handlers = requestHandlers[method] as HttpRequestEventHandler;
//
//			// if the handler list is null
//			if (handlers != null)
//				// add the handlers into the list by the method we're registering for
//				handlers = (HttpRequestEventHandler)Delegate.Remove(handlers, onRequest);
//
//			// if there are still some handlers, and the list is zero length, remove the list entirely
//			if (handlers != null)
//				if (handlers.GetInvocationList().Length == 0)
//				{
//					requestHandlers.Remove(method);
//					return;
//				}
//
//			// save the list of handlers for the next guy
//			requestHandlers[method] = handlers;
//		}

        /// <summary>
        /// Dispatches the HttpRequest to the registered handlers for processing. If no response is created or sent, then a default response will be prepared.
        /// </summary>
        /// <param name="dispatcher"></param>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public void DispatchRequest(object sender, ref HttpRequestCancelEventArgs e)
        {
//			Debug.WriteLine(string.Format("Dispatching request '{0}'.", e.Request.Method));

            // internally dispatch the request to the registered handler(s) until someone responds to the request
            Delegate[] delegates = this.InternalDispatchRequest(sender, ref e);

            if (!e.Cancel && e.Response == null)
            {
                #region Asp Processing

                // if we have an asp host
                if (_aspHost != null)
                {
                    bool alreadyRetried = false;

RetryAspProcessing:

                    try
                    {
                        // use the asp host to process the request
                        _aspHost.ProcessRequest((HttpConnection)sender, ref e);
                    }
                    catch (AppDomainUnloadedException)
                    {
//						Debug.WriteLine(ex);

                        // it might have unloaded on us, so we can try once more
                        if (!alreadyRetried)
                        {
                            // recreate the host
                            this.CreateAspHost();
                            alreadyRetried = true;

                            // jump back and try again
                            goto RetryAspProcessing;
                        }
                    }
                }

                #endregion

                // after the asp processing, it might have already sent the response so watch out that it didn't cancel
                // the remaining processing we had to do
                if (e.Cancel)
                {
                    return;
                }

                // and finally if we still have no response for the request, let's fill in which ever is appropriate
                if (e.Response == null)
                {
                    // if there are no handlers that were registered for the request's method
                    if (delegates.Length == 0)
                    {
                        // then the method is not allowed
                        e.Response = new HttpResponse(new MethodNotAllowedStatus());
                        e.Response.SetBodyFromString(string.Format("405 - The '{0}' method is not allowed.\nThe request for the '{1}' resource cannot be processed.", e.Request.Method, e.Request.RequestUri), HttpUtils.Encoding, MIME.Text.Plain);
                    }
                    else
                    {
                        // resource not found (there was a handler but it didn't respond) so obviously the resource couldn't be found
                        e.Response = new HttpResponse(new NotFoundStatus());
                        e.Response.SetBodyFromString(string.Format("404 - The resource '{0}' could not be found.", e.Request.RequestUri), HttpUtils.Encoding, MIME.Text.Plain);
                    }
                }
            }
        }