/// <summary>
/// </summary>
/// <param name="context"></param>
/// <returns></returns>
public async Task ProcessRequestCore(IDotvvmRequestContext context)
{
var requestTracer = context.Services.GetRequiredService <AggregateRequestTracer>();
if (context.HttpContext.Request.Method != "GET" && context.HttpContext.Request.Method != "POST")
{
// unknown HTTP method
context.HttpContext.Response.StatusCode = (int)HttpStatusCode.MethodNotAllowed;
throw new DotvvmHttpException("Only GET and POST methods are supported!");
}
if (context.HttpContext.Request.Headers["X-PostbackType"] == "StaticCommand")
{
await ProcessStaticCommandRequest(context);
await requestTracer.TraceEvent(RequestTracingConstants.StaticCommandExecuted, context);
return;
}
var isPostBack = context.IsPostBack = DetermineIsPostBack(context.HttpContext);
// build the page view
var page = DotvvmViewBuilder.BuildView(context);
page.SetValue(Internal.RequestContextProperty, context);
context.View = page;
await requestTracer.TraceEvent(RequestTracingConstants.ViewInitialized, context);
// locate and create the view model
context.ViewModel = ViewModelLoader.InitializeViewModel(context, page);
// get action filters
var viewModelFilters = ActionFilterHelper.GetActionFilters <IViewModelActionFilter>(context.ViewModel.GetType().GetTypeInfo())
.Concat(context.Configuration.Runtime.GlobalFilters.OfType <IViewModelActionFilter>());
var requestFilters = ActionFilterHelper.GetActionFilters <IPageActionFilter>(context.ViewModel.GetType().GetTypeInfo())
.Concat(context.Configuration.Runtime.GlobalFilters.OfType <IPageActionFilter>());
foreach (var f in requestFilters)
{
await f.OnPageInitializedAsync(context);
}
try
{
// run the preinit phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.PreInit);
page.DataContext = context.ViewModel;
// run OnViewModelCreated on action filters
foreach (var filter in viewModelFilters)
{
await filter.OnViewModelCreatedAsync(context);
}
await requestTracer.TraceEvent(RequestTracingConstants.ViewModelCreated, context);
// perform parameter binding
if (context.ViewModel is DotvvmViewModelBase dotvvmViewModelBase)
{
dotvvmViewModelBase.ExecuteOnViewModelRecursive(v => ViewModelParameterBinder.BindParameters(context, v));
}
else
{
ViewModelParameterBinder.BindParameters(context, context.ViewModel);
}
// init the view model lifecycle
if (context.ViewModel is IDotvvmViewModel viewModel)
{
viewModel.Context = context;
ChildViewModelsCache.SetViewModelClientPath(viewModel, ChildViewModelsCache.RootViewModelPath);
await viewModel.Init();
}
// run the init phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.Init);
await requestTracer.TraceEvent(RequestTracingConstants.InitCompleted, context);
object commandResult = null;
if (!isPostBack)
{
// perform standard get
if (context.ViewModel is IDotvvmViewModel)
{
await((IDotvvmViewModel)context.ViewModel).Load();
}
// run the load phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.Load);
await requestTracer.TraceEvent(RequestTracingConstants.LoadCompleted, context);
}
else
{
// perform the postback
string postData;
using (var sr = new StreamReader(context.HttpContext.Request.Body))
{
postData = await sr.ReadToEndAsync();
}
ViewModelSerializer.PopulateViewModel(context, postData);
// run OnViewModelDeserialized on action filters
foreach (var filter in viewModelFilters)
{
await filter.OnViewModelDeserializedAsync(context);
}
await requestTracer.TraceEvent(RequestTracingConstants.ViewModelDeserialized, context);
// validate CSRF token
try
{
CsrfProtector.VerifyToken(context, context.CsrfToken);
}
catch (SecurityException exc)
{
await context.InterruptRequestAsync(HttpStatusCode.BadRequest, exc.Message);
}
if (context.ViewModel is IDotvvmViewModel)
{
await((IDotvvmViewModel)context.ViewModel).Load();
}
// run the load phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.Load);
await requestTracer.TraceEvent(RequestTracingConstants.LoadCompleted, context);
// invoke the postback command
var actionInfo = ViewModelSerializer.ResolveCommand(context, page);
// get filters
var methodFilters = context.Configuration.Runtime.GlobalFilters.OfType <ICommandActionFilter>()
.Concat(ActionFilterHelper.GetActionFilters <ICommandActionFilter>(context.ViewModel.GetType().GetTypeInfo()));
if (actionInfo.Binding.GetProperty <ActionFiltersBindingProperty>(ErrorHandlingMode.ReturnNull) is ActionFiltersBindingProperty filters)
{
methodFilters = methodFilters.Concat(filters.Filters.OfType <ICommandActionFilter>());
}
commandResult = await ExecuteCommand(actionInfo, context, methodFilters);
await requestTracer.TraceEvent(RequestTracingConstants.CommandExecuted, context);
}
if (context.ViewModel is IDotvvmViewModel)
{
await((IDotvvmViewModel)context.ViewModel).PreRender();
}
// run the prerender phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.PreRender);
// run the prerender complete phase in the page
DotvvmControlCollection.InvokePageLifeCycleEventRecursive(page, LifeCycleEventType.PreRenderComplete);
await requestTracer.TraceEvent(RequestTracingConstants.PreRenderCompleted, context);
// generate CSRF token if required
if (string.IsNullOrEmpty(context.CsrfToken))
{
context.CsrfToken = CsrfProtector.GenerateToken(context);
}
// run OnViewModelSerializing on action filters
foreach (var filter in viewModelFilters)
{
await filter.OnViewModelSerializingAsync(context);
}
await requestTracer.TraceEvent(RequestTracingConstants.ViewModelSerialized, context);
// render the output
ViewModelSerializer.BuildViewModel(context);
if (commandResult != null)
{
context.ViewModelJson["commandResult"] = JToken.FromObject(commandResult);
}
if (!context.IsInPartialRenderingMode)
{
// standard get
await OutputRenderer.WriteHtmlResponse(context, page);
}
else
{
// postback or SPA content
var postBackUpdates = OutputRenderer.RenderPostbackUpdatedControls(context, page);
ViewModelSerializer.AddPostBackUpdatedControls(context, postBackUpdates);
await OutputRenderer.WriteViewModelResponse(context, page);
}
await requestTracer.TraceEvent(RequestTracingConstants.OutputRendered, context);
foreach (var f in requestFilters)
{
await f.OnPageRenderedAsync(context);
}
}
catch (DotvvmInterruptRequestExecutionException) { throw; }
catch (DotvvmHttpException) { throw; }
catch (Exception ex)
{
// run OnPageException on action filters
foreach (var filter in requestFilters)
{
await filter.OnPageExceptionAsync(context, ex);
if (context.IsPageExceptionHandled)
{
context.InterruptRequest();
}
}
throw;
}
finally
{
if (context.ViewModel != null)
{
ViewModelLoader.DisposeViewModel(context.ViewModel);
}
StaticCommandServiceLoader.DisposeStaticCommandServices(context);
}
}