C# EasyRequest.FailRequest方法代码示例

            private void FindAndFailActiveRequest(SafeCurlMultiHandle multiHandle, EasyRequest easy, Exception error)
            {
                VerboseTrace("Error: " + error.Message, easy: easy);

                IntPtr gcHandlePtr;
                ActiveRequest activeRequest;
                if (FindActiveRequest(easy, out gcHandlePtr, out activeRequest))
                {
                    DeactivateActiveRequest(multiHandle, easy, gcHandlePtr, activeRequest.CancellationRegistration);
                    easy.FailRequest(error);
                    easy.Cleanup(); // no active processing remains, so we can cleanup
                }
                else
                {
                    Debug.Assert(easy.Task.IsCompleted, "We should only not be able to find the request if it failed or we started to send back the response.");
                }
            }

            private void FinishRequest(EasyRequest completedOperation, int messageResult)
            {
                VerboseTrace("messageResult: " + messageResult, easy: completedOperation);

                if (completedOperation._responseMessage.StatusCode != HttpStatusCode.Unauthorized && completedOperation._handler.PreAuthenticate)
                {
                    ulong availedAuth;
                    if (Interop.libcurl.curl_easy_getinfo(completedOperation._easyHandle, CURLINFO.CURLINFO_HTTPAUTH_AVAIL, out availedAuth) == CURLcode.CURLE_OK)
                    {
                        // TODO: fix locking in AddCredentialToCache
                        completedOperation._handler.AddCredentialToCache(
                            completedOperation._requestMessage.RequestUri, availedAuth, completedOperation._networkCredential);
                    }
                    // Ignore errors: no need to fail for the sake of putting the credentials into the cache
                }

                switch (messageResult)
                {
                    case CURLcode.CURLE_OK:
                        completedOperation.EnsureResponseMessagePublished();
                        break;
                    default:
                        completedOperation.FailRequest(CreateHttpRequestException(new CurlException(messageResult, isMulti: false)));
                        break;
                }

                // At this point, we've completed processing the entire request, either due to error
                // or due to completing the entire response.
                completedOperation.Cleanup();
            }

            private void ActivateNewRequest(SafeCurlMultiHandle multiHandle, EasyRequest easy)
            {
                Debug.Assert(easy != null, "We should never get a null request");
                Debug.Assert(easy._associatedMultiAgent == null, "New requests should not be associated with an agent yet");

                // If cancellation has been requested, complete the request proactively
                if (easy._cancellationToken.IsCancellationRequested)
                {
                    easy.FailRequest(new OperationCanceledException(easy._cancellationToken));
                    easy.Cleanup(); // no active processing remains, so cleanup
                    return;
                }

                // Otherwise, configure it.  Most of the configuration was already done when the EasyRequest
                // was created, but there's additional configuration we need to do specific to this
                // multi agent, specifically telling the easy request about its own GCHandle and setting
                // up callbacks for data processing.  Once it's configured, add it to the multi handle.
                GCHandle gcHandle = GCHandle.Alloc(easy);
                IntPtr gcHandlePtr = GCHandle.ToIntPtr(gcHandle);
                try
                {
                    easy._associatedMultiAgent = this;
                    easy.SetCurlOption(CURLoption.CURLOPT_PRIVATE, gcHandlePtr);
                    SetCurlCallbacks(easy, gcHandlePtr);
                    ThrowIfCURLMError(Interop.libcurl.curl_multi_add_handle(multiHandle, easy._easyHandle));
                }
                catch (Exception exc)
                {
                    gcHandle.Free();
                    easy.FailRequest(exc);
                    easy.Cleanup();  // no active processing remains, so cleanup
                    return;
                }

                // And if cancellation can be requested, hook up a cancellation callback.
                // This callback will put the easy request back into the queue, which will
                // ensure that a wake-up request has been issued.  When we pull
                // the easy request out of the request queue, we'll see that it's already
                // associated with this agent, meaning that it's a cancellation request,
                // and we'll deal with it appropriately.
                var cancellationReg = default(CancellationTokenRegistration);
                if (easy._cancellationToken.CanBeCanceled)
                {
                    cancellationReg = easy._cancellationToken.Register(s =>
                    {
                        var state = (Tuple<MultiAgent, EasyRequest>)s;
                        state.Item1.Queue(new IncomingRequest { Easy = state.Item2, Type = IncomingRequestType.Cancel });
                    }, Tuple.Create<MultiAgent, EasyRequest>(this, easy));
                }

                // Finally, add it to our map.
                _activeOperations.Add(
                    gcHandlePtr, 
                    new ActiveRequest { Easy = easy, CancellationRegistration = cancellationReg });
            }

            private void FinishRequest(EasyRequest completedOperation, CURLcode messageResult)
            {
                VerboseTrace("messageResult: " + messageResult, easy: completedOperation);

                if (completedOperation._responseMessage.StatusCode != HttpStatusCode.Unauthorized)
                {
                    if (completedOperation._handler.PreAuthenticate)
                    {
                        long authAvailable;
                        if (Interop.Http.EasyGetInfoLong(completedOperation._easyHandle, CURLINFO.CURLINFO_HTTPAUTH_AVAIL, out authAvailable) == CURLcode.CURLE_OK)
                        {
                            completedOperation._handler.AddCredentialToCache(
                               completedOperation._requestMessage.RequestUri, (CURLAUTH)authAvailable, completedOperation._networkCredential);
                        }
                        // Ignore errors: no need to fail for the sake of putting the credentials into the cache
                    }

                    completedOperation._handler.AddResponseCookies(
                        completedOperation._requestMessage.RequestUri, completedOperation._responseMessage);
                }

                // Complete or fail the request
                try
                {
                    bool unsupportedProtocolRedirect = messageResult == CURLcode.CURLE_UNSUPPORTED_PROTOCOL && completedOperation._isRedirect;
                    if (!unsupportedProtocolRedirect)
                    {
                        ThrowIfCURLEError(messageResult);
                    }
                    completedOperation.EnsureResponseMessagePublished();
                }
                catch (Exception exc)
                {
                    completedOperation.FailRequest(exc);
                }

                // At this point, we've completed processing the entire request, either due to error
                // or due to completing the entire response.
                completedOperation.Cleanup();
            }

        protected internal override Task<HttpResponseMessage> SendAsync(
            HttpRequestMessage request,
            CancellationToken cancellationToken)
        {
            if (request == null)
            {
                throw new ArgumentNullException("request", SR.net_http_handler_norequest);
            }

            if (request.RequestUri.Scheme == UriSchemeHttps)
            {
                if (!s_supportsSSL)
                {
                    throw new PlatformNotSupportedException(SR.net_http_unix_https_support_unavailable_libcurl);
                }
            }
            else
            {
                Debug.Assert(request.RequestUri.Scheme == UriSchemeHttp, "HttpClient expected to validate scheme as http or https.");
            }

            if (request.Headers.TransferEncodingChunked.GetValueOrDefault() && (request.Content == null))
            {
                throw new InvalidOperationException(SR.net_http_chunked_not_allowed_with_empty_content);
            }

            if (_useCookie && _cookieContainer == null)
            {
                throw new InvalidOperationException(SR.net_http_invalid_cookiecontainer);
            }

            CheckDisposed();
            SetOperationStarted();

            // Do an initial cancellation check to avoid initiating the async operation if
            // cancellation has already been requested.  After this, we'll rely on CancellationToken.Register
            // to notify us of cancellation requests and shut down the operation if possible.
            if (cancellationToken.IsCancellationRequested)
            {
                return Task.FromCanceled<HttpResponseMessage>(cancellationToken);
            }

            // Create the easy request.  This associates the easy request with this handler and configures
            // it based on the settings configured for the handler.
            var easy = new EasyRequest(this, request, cancellationToken);
            try
            {
                easy.InitializeCurl();
                if (easy._requestContentStream != null)
                {
                    easy._requestContentStream.Run();
                }
                _agent.Queue(new MultiAgent.IncomingRequest { Easy = easy, Type = MultiAgent.IncomingRequestType.New });
            }
            catch (Exception exc)
            {
                easy.FailRequest(exc);
                easy.Cleanup(); // no active processing remains, so we can cleanup
            }
            return easy.Task;
        }

        /// <summary>
        /// Loads the request's request content stream asynchronously and 
        /// then submits the request to the multi agent.
        /// </summary>
        private async Task<HttpResponseMessage> QueueOperationWithRequestContentAsync(EasyRequest easy)
        {
            Debug.Assert(easy._requestMessage.Content != null, "Expected request to have non-null request content");

            easy._requestContentStream = await easy._requestMessage.Content.ReadAsStreamAsync().ConfigureAwait(false);
            if (easy._cancellationToken.IsCancellationRequested)
            {
                easy.FailRequest(new OperationCanceledException(easy._cancellationToken));
                easy.Cleanup(); // no active processing remains, so we can cleanup
            }
            else
            {
                ConfigureAndQueue(easy);
            }
            return await easy.Task.ConfigureAwait(false);
        }

 private void ConfigureAndQueue(EasyRequest easy)
 {
     try
     {
         easy.InitializeCurl();
         _agent.Queue(new MultiAgent.IncomingRequest { Easy = easy, Type = MultiAgent.IncomingRequestType.New });
     }
     catch (Exception exc)
     {
         easy.FailRequest(exc);
         easy.Cleanup(); // no active processing remains, so we can cleanup
     }
 }