private async Task<AspNetWebSocket> ProcessRequestImplAsync() {
AspNetWebSocket webSocket = null;
try {
// SendResponse and other asynchronous notifications cannot be process by ASP.NET after this point.
_root.WorkerRequest.SuppressSendResponseNotifications();
// A flush is necessary to activate the WebSocket module so that we can get its pointer.
//
// DevDiv #401948: We can't allow a flush failure to propagate out, otherwise the rest of
// this method doesn't run, which could leak resources (by not invoking the user callback)
// or cause weird behavior (by not calling CompleteTransitionToWebSocket, which could corrupt
// server state). If the flush fails, we'll wait to propagate the exception until a safe
// point later in this method.
ExceptionDispatchInfo flushExceptionDispatchInfo = DoFlush();
// Create the AspNetWebSocket. There's a chance that the client disconnected before we
// hit this code. If this is the case, we'll pass a null WebSocketPipe to the
// AspNetWebSocket ctor, which immediately sets the socket into an aborted state.
UnmanagedWebSocketContext unmanagedWebSocketContext = _root.WorkerRequest.GetWebSocketContext();
WebSocketPipe pipe = (unmanagedWebSocketContext != null) ? new WebSocketPipe(unmanagedWebSocketContext, PerfCounters.Instance) : null;
webSocket = new AspNetWebSocket(pipe, _subProtocol);
// slim down the HttpContext as much as possible to allow the GC to reclaim memory
_httpContext.CompleteTransitionToWebSocket();
// always install a new SynchronizationContext, even if the user is running in legacy SynchronizationContext mode
AspNetSynchronizationContext syncContext = new AspNetSynchronizationContext(this);
_httpContext.SyncContext = syncContext;
bool webSocketRequestSucceeded = false;
try {
// need to keep track of this in the manager so that we can abort if it the AppDomain goes down
AspNetWebSocketManager.Current.Add(webSocket);
// bump up the total count (the currently-executing count is recorded separately)
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_TOTAL_WEBSOCKETS);
// Release the reference to the user delegate (which might just be a simple initialization routine) so that
// the GC can claim it. The only thing that needs to remain alive is the Task itself, which we're referencing.
Task task = null;
syncContext.Send(_ => {
task = _userFunc(new AspNetWebSocketContextImpl(new HttpContextWrapper(_httpContext), _root.WorkerRequest, webSocket));
}, null);
// Was there an exception from user code? If so, rethrow (which logs).
ExceptionDispatchInfo exception = syncContext.ExceptionDispatchInfo;
if (exception != null) {
exception.Throw();
}
_userFunc = null;
await task.ConfigureAwait(continueOnCapturedContext: false);
// Was there an exception from the earlier call to DoFlush? If so, rethrow (which logs).
// This needs to occur after the user's callback finishes, otherwise ASP.NET could try
// to complete the request while the callback is still accessing it.
if (flushExceptionDispatchInfo != null) {
flushExceptionDispatchInfo.Throw();
}
// Any final state except Aborted is marked as 'success'.
// It's possible execution never reaches this point, e.g. if the user's
// callback throws an exception. In that case, 'webSocketRequestSucceeded'
// will keep its default value of false, and the performance counter
// will mark this request as having failed.
if (webSocket.State != WebSocketState.Aborted) {
webSocketRequestSucceeded = true;
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_SUCCEEDED_WEBSOCKETS);
}
}
finally {
// we need to make sure the user can't call the WebSocket any more after this point
_isProcessingComplete = true;
webSocket.DisposeInternal();
AspNetWebSocketManager.Current.Remove(webSocket);
if (!webSocketRequestSucceeded) {
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_FAILED_WEBSOCKETS);
}
}
}
catch (Exception ex) {
// don't let the exception propagate upward; just log it instead
WebBaseEvent.RaiseRuntimeError(ex, null);
}
return webSocket;
}
internal void RestoreSavedAspNetSynchronizationContext(AspNetSynchronizationContext syncContext)
{
AsyncOperationManager.SynchronizationContext = syncContext;
this._syncContext = syncContext;
}
private void ExecuteInternal(IHttpHandler handler, TextWriter writer, bool preserveForm, bool setPreviousPage, VirtualPath path, VirtualPath filePath, string physPath, Exception error, string queryStringOverride)
{
if (handler == null)
{
throw new ArgumentNullException("handler");
}
HttpRequest request = this._context.Request;
HttpResponse response = this._context.Response;
HttpApplication applicationInstance = this._context.ApplicationInstance;
HttpValueCollection form = null;
VirtualPath path2 = null;
string queryStringText = null;
TextWriter writer2 = null;
AspNetSynchronizationContext syncContext = null;
this.VerifyTransactionFlow(handler);
this._context.PushTraceContext();
this._context.SetCurrentHandler(handler);
bool enabled = this._context.SyncContext.Enabled;
this._context.SyncContext.Disable();
try
{
try
{
this._context.ServerExecuteDepth++;
path2 = request.SwitchCurrentExecutionFilePath(filePath);
if (!preserveForm)
{
form = request.SwitchForm(new HttpValueCollection());
if (queryStringOverride == null)
{
queryStringOverride = string.Empty;
}
}
if (queryStringOverride != null)
{
queryStringText = request.QueryStringText;
request.QueryStringText = queryStringOverride;
}
if (writer != null)
{
writer2 = response.SwitchWriter(writer);
}
Page page = handler as Page;
if (page != null)
{
if (setPreviousPage)
{
page.SetPreviousPage(this._context.PreviousHandler as Page);
}
Page page2 = this._context.Handler as Page;
if ((page2 != null) && page2.SmartNavigation)
{
page.SmartNavigation = true;
}
if (page is IHttpAsyncHandler)
{
syncContext = this._context.InstallNewAspNetSynchronizationContext();
}
}
if (((handler is StaticFileHandler) || (handler is DefaultHttpHandler)) && !DefaultHttpHandler.IsClassicAspRequest(filePath.VirtualPathString))
{
try
{
response.WriteFile(physPath);
}
catch
{
error = new HttpException(0x194, string.Empty);
}
}
else if (!(handler is Page))
{
error = new HttpException(0x194, string.Empty);
}
else
{
if (handler is IHttpAsyncHandler)
{
bool isInCancellablePeriod = this._context.IsInCancellablePeriod;
if (isInCancellablePeriod)
{
this._context.EndCancellablePeriod();
}
try
{
IHttpAsyncHandler handler2 = (IHttpAsyncHandler)handler;
IAsyncResult result = handler2.BeginProcessRequest(this._context, null, null);
if (!result.IsCompleted)
{
bool flag3 = false;
try
{
try
{
}
finally
{
Monitor.Exit(applicationInstance);
flag3 = true;
}
WaitHandle asyncWaitHandle = result.AsyncWaitHandle;
if (asyncWaitHandle == null)
{
goto Label_0210;
}
asyncWaitHandle.WaitOne();
goto Label_0226;
Label_020A:
Thread.Sleep(1);
Label_0210:
if (!result.IsCompleted)
{
goto Label_020A;
}
}
finally
{
if (flag3)
{
Monitor.Enter(applicationInstance);
}
}
}
Label_0226:
try
{
handler2.EndProcessRequest(result);
}
catch (Exception exception)
{
error = exception;
}
goto Label_0306;
}
finally
{
if (isInCancellablePeriod)
{
this._context.BeginCancellablePeriod();
}
}
}
using (new DisposableHttpContextWrapper(this._context))
{
try
{
handler.ProcessRequest(this._context);
}
catch (Exception exception2)
{
error = exception2;
}
}
}
}
finally
{
this._context.ServerExecuteDepth--;
this._context.RestoreCurrentHandler();
if (writer2 != null)
{
response.SwitchWriter(writer2);
}
if ((queryStringOverride != null) && (queryStringText != null))
{
request.QueryStringText = queryStringText;
}
if (form != null)
{
request.SwitchForm(form);
}
request.SwitchCurrentExecutionFilePath(path2);
if (syncContext != null)
{
this._context.RestoreSavedAspNetSynchronizationContext(syncContext);
}
if (enabled)
{
this._context.SyncContext.Enable();
}
this._context.PopTraceContext();
}
}
catch
{
throw;
}
Label_0306:
if (error == null)
{
return;
}
if ((error is HttpException) && (((HttpException)error).GetHttpCode() != 500))
{
error = null;
}
if (path != null)
{
throw new HttpException(System.Web.SR.GetString("Error_executing_child_request_for_path", new object[] { path }), error);
}
throw new HttpException(System.Web.SR.GetString("Error_executing_child_request_for_handler", new object[] { handler.GetType().ToString() }), error);
}
internal AspNetSynchronizationContext InstallNewAspNetSynchronizationContext()
{
AspNetSynchronizationContext context = this._syncContext;
if ((context != null) && (context == AsyncOperationManager.SynchronizationContext))
{
this._syncContext = new AspNetSynchronizationContext(this.ApplicationInstance);
AsyncOperationManager.SynchronizationContext = this._syncContext;
return context;
}
return null;
}
internal void ClearReferences()
{
this._appInstance = null;
this._handler = null;
this._handlerStack = null;
this._currentHandler = null;
if (this._isIntegratedPipeline)
{
this._items = null;
this._syncContext = null;
}
}
internal void RestoreSavedAspNetSynchronizationContext(AspNetSynchronizationContext syncContext);
internal PageAsyncInfo(Page page)
{
this._page = page;
this._app = page.Context.ApplicationInstance;
this._syncContext = page.Context.SyncContext;
this._completionCallback = new AsyncCallback(this.OnAsyncHandlerCompletion);
this._callHandlersThreadpoolCallback = new WaitCallback(this.CallHandlersFromThreadpoolThread);
this._callHandlersCancellableCallback = new WaitCallback(this.CallHandlersCancellableCallback);
}
private async Task <AspNetWebSocket> ProcessRequestImplAsync()
{
AspNetWebSocket webSocket = null;
try {
// SendResponse and other asynchronous notifications cannot be process by ASP.NET after this point.
_root.WorkerRequest.SuppressSendResponseNotifications();
// A flush is necessary to activate the WebSocket module so that we can get its pointer.
//
// DevDiv #401948: We can't allow a flush failure to propagate out, otherwise the rest of
// this method doesn't run, which could leak resources (by not invoking the user callback)
// or cause weird behavior (by not calling CompleteTransitionToWebSocket, which could corrupt
// server state). If the flush fails, we'll wait to propagate the exception until a safe
// point later in this method.
ExceptionDispatchInfo flushExceptionDispatchInfo = DoFlush();
// Create the AspNetWebSocket. There's a chance that the client disconnected before we
// hit this code. If this is the case, we'll pass a null WebSocketPipe to the
// AspNetWebSocket ctor, which immediately sets the socket into an aborted state.
UnmanagedWebSocketContext unmanagedWebSocketContext = _root.WorkerRequest.GetWebSocketContext();
WebSocketPipe pipe = (unmanagedWebSocketContext != null) ? new WebSocketPipe(unmanagedWebSocketContext, PerfCounters.Instance) : null;
webSocket = new AspNetWebSocket(pipe, _subProtocol);
// slim down the HttpContext as much as possible to allow the GC to reclaim memory
_httpContext.CompleteTransitionToWebSocket();
// always install a new SynchronizationContext, even if the user is running in legacy SynchronizationContext mode
AspNetSynchronizationContext syncContext = new AspNetSynchronizationContext(this);
_httpContext.SyncContext = syncContext;
bool webSocketRequestSucceeded = false;
try {
// need to keep track of this in the manager so that we can abort if it the AppDomain goes down
AspNetWebSocketManager.Current.Add(webSocket);
// bump up the total count (the currently-executing count is recorded separately)
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_TOTAL_WEBSOCKETS);
// Release the reference to the user delegate (which might just be a simple initialization routine) so that
// the GC can claim it. The only thing that needs to remain alive is the Task itself, which we're referencing.
Task task = null;
syncContext.Send(_ => {
task = _userFunc(new AspNetWebSocketContextImpl(new HttpContextWrapper(_httpContext), _root.WorkerRequest, webSocket));
}, null);
// Was there an exception from user code? If so, rethrow (which logs).
ExceptionDispatchInfo exception = syncContext.ExceptionDispatchInfo;
if (exception != null)
{
exception.Throw();
}
_userFunc = null;
await task.ConfigureAwait(continueOnCapturedContext : false);
// Was there an exception from the earlier call to DoFlush? If so, rethrow (which logs).
// This needs to occur after the user's callback finishes, otherwise ASP.NET could try
// to complete the request while the callback is still accessing it.
if (flushExceptionDispatchInfo != null)
{
flushExceptionDispatchInfo.Throw();
}
// Any final state except Aborted is marked as 'success'.
// It's possible execution never reaches this point, e.g. if the user's
// callback throws an exception. In that case, 'webSocketRequestSucceeded'
// will keep its default value of false, and the performance counter
// will mark this request as having failed.
if (webSocket.State != WebSocketState.Aborted)
{
webSocketRequestSucceeded = true;
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_SUCCEEDED_WEBSOCKETS);
}
}
finally {
// we need to make sure the user can't call the WebSocket any more after this point
_isProcessingComplete = true;
webSocket.DisposeInternal();
AspNetWebSocketManager.Current.Remove(webSocket);
if (!webSocketRequestSucceeded)
{
PerfCounters.IncrementCounter(AppPerfCounter.REQUESTS_FAILED_WEBSOCKETS);
}
}
}
catch (Exception ex) {
// don't let the exception propagate upward; just log it instead
WebBaseEvent.RaiseRuntimeError(ex, null);
}
return(webSocket);
}
