Server-side caching of viewmodels

src/DotVVM.Framework.Tests.Owin/DefaultViewModelSerializerTests.cs

@@ -18,6 +18,9 @@
 using Microsoft.Owin.Security.DataProtection;
 using Newtonsoft.Json.Linq;
 using Microsoft.Owin.Infrastructure;
+using DotVVM.Framework.Runtime.Caching;
+using DotVVM.Framework.Hosting.Owin.Runtime.Caching;
+using DotVVM.Framework.Routing;
 
 namespace DotVVM.Framework.Tests.Runtime
 {
@@ -37,6 +40,7 @@ public void TestInit()
                 services.AddTransient<IViewModelProtector, DefaultViewModelProtector>();
                 services.AddTransient<ICsrfProtector, DefaultCsrfProtector>();
                 services.AddSingleton<ICookieManager, ChunkingCookieManager>();
+                services.AddSingleton<IDotvvmCacheAdapter, OwinDotvvmCacheAdapter>();
             });
 			configuration.Security.SigningKey = Convert.FromBase64String("Uiq1FXs016lC6QaWIREB7H2P/sn4WrxkvFkqaIKpB27E7RPuMipsORgSgnT+zJmUu8zXNSJ4BdL73JEMRDiF6A1ScRNwGyDxDAVL3nkpNlGrSoLNM1xHnVzSbocLFDrdEiZD2e3uKujguycvWSNxYzjgMjXNsaqvCtMu/qRaEGc=");
 			configuration.Security.EncryptionKey = Convert.FromBase64String("jNS9I3ZcxzsUSPYJSwzCOm/DEyKFNlBmDGo9wQ6nxKg=");
@@ -54,11 +58,11 @@ public void TestInit()
 
 
 			serializer = configuration.ServiceLocator.GetService<IViewModelSerializer>() as DefaultViewModelSerializer;
-            context = new DotvvmRequestContext()
-            {
+            context = new DotvvmRequestContext() {
                 Configuration = configuration,
                 HttpContext = contextMock.Object,
                 Presenter = configuration.RouteTable.GetDefaultPresenter(configuration.ServiceProvider),
+                Route = new DotvvmRoute("TestRoute", "test.dothtml", new { }, p => p.GetService<DotvvmPresenter>(), configuration)
             };
         }
 

src/DotVVM.Framework/Configuration/DotvvmExperimentalFeaturesConfiguration.cs

@@ -8,9 +8,13 @@ public class DotvvmExperimentalFeaturesConfiguration
     {
 
         // Add a property od DotvvmExperimentalFeatureFlag for each experimental feature here
+
         [JsonProperty("lazyCsrfToken", DefaultValueHandling = DefaultValueHandling.Ignore)]
         public DotvvmExperimentalFeatureFlag LazyCsrfToken { get; private set; } = new DotvvmExperimentalFeatureFlag();
 
+        [JsonProperty("serverSideViewModelCache", DefaultValueHandling = DefaultValueHandling.Ignore)]
+        public DotvvmExperimentalFeatureFlag ServerSideViewModelCache { get; private set; } = new DotvvmExperimentalFeatureFlag();
+
     }
 
 }

src/DotVVM.Framework/DependencyInjection/DotVVMServiceCollectionExtensions.cs

@@ -36,6 +36,8 @@ public static IServiceCollection RegisterDotVVMServices(IServiceCollection servi
             services.TryAddSingleton<IDotvvmViewBuilder, DefaultDotvvmViewBuilder>();
             services.TryAddSingleton<IViewModelSerializer, DefaultViewModelSerializer>();
             services.TryAddSingleton<IViewModelLoader, DefaultViewModelLoader>();
+            services.TryAddSingleton<IViewModelServerCache, DefaultViewModelServerCache>();
+            services.TryAddSingleton<IViewModelServerStore, InMemoryViewModelServerStore>();
             services.TryAddSingleton<IStaticCommandServiceLoader, DefaultStaticCommandServiceLoader>();
             services.TryAddSingleton<IViewModelValidationMetadataProvider, AttributeViewModelValidationMetadataProvider>();
             services.TryAddSingleton<IValidationRuleTranslator, ViewModelValidationRuleTranslator>();

src/DotVVM.Framework/DotVVM.Framework.csproj

@@ -101,6 +101,7 @@
   </ItemGroup>
   <ItemGroup>
     <PackageReference Include="Newtonsoft.Json" Version="10.0.3" />
+    <PackageReference Include="Newtonsoft.Json.Bson" Version="1.0.1" />
     <PackageReference Include="System.ValueTuple" Version="4.4.0" />
   </ItemGroup>
   <ItemGroup Condition=" '$(TargetFramework)' == 'netstandard2.0' ">

src/DotVVM.Framework/Hosting/DotvvmPresenter.cs

@@ -271,6 +271,12 @@ public async Task ProcessRequestCore(IDotvvmRequestContext context)
 
                 foreach (var f in requestFilters) await f.OnPageRenderedAsync(context);
             }
+            catch (DotvvmInterruptRequestExecutionException ex) when (ex.InterruptReason == InterruptReason.CachedViewModelMissing)
+            {
+                // the client needs to repeat the postback and send the full viewmodel
+                context.SetCachedViewModelMissingResponse();
+                throw;
+            }
             catch (DotvvmInterruptRequestExecutionException) { throw; }
             catch (DotvvmHttpException) { throw; }
             catch (Exception ex)

src/DotVVM.Framework/Hosting/DotvvmRequestContextExtensions.cs

@@ -131,6 +131,12 @@ public static void RedirectToRoutePermanent(this IDotvvmRequestContext context,
     public static void SetRedirectResponse(this IDotvvmRequestContext context, string url, int statusCode = (int)HttpStatusCode.Redirect, bool replaceInHistory = false, bool allowSpaRedirect = false) =>
         context.Configuration.ServiceProvider.GetRequiredService<IHttpRedirectService>().WriteRedirectResponse(context.HttpContext, url, statusCode, replaceInHistory, allowSpaRedirect);
 
+    internal static void SetCachedViewModelMissingResponse(this IDotvvmRequestContext context)
+    {
+        context.HttpContext.Response.StatusCode = 200;
+        context.HttpContext.Response.ContentType = "application/json";
+        context.HttpContext.Response.Write(DefaultViewModelSerializer.GenerateMissingCachedViewModelResponse());
+    }
 
     /// <summary>
     /// Ends the request execution when the <see cref="ModelState"/> is not valid and displays the validation errors in <see cref="ValidationSummary"/> control.

src/DotVVM.Framework/Hosting/InterruptReason.cs

@@ -7,6 +7,7 @@ public enum InterruptReason
         Redirect,
         RedirectPermanent,
         ReturnFile,
-        ModelValidationFailed
+        ModelValidationFailed,
+        CachedViewModelMissing
     }
 }

src/DotVVM.Framework/Resources/Scripts/DotVVM.d.ts

@@ -247,6 +247,8 @@ interface IDotvvmExtensions {
 }
 interface IDotvvmViewModelInfo {
     viewModel?: any;
+    viewModelCacheId?: string;
+    viewModelCache?: any;
     renderedResources?: string[];
     url?: string;
     virtualDirectory?: string;
@@ -333,6 +335,8 @@ declare class DotVVM {
     private addLeadingSlash;
     private concatUrl;
     patch(source: any, patch: any): any;
+    diff(source: any, modified: any): any;
+    readonly diffEqual: {};
     private updateDynamicPathFragments;
     private postJSON;
     private getJSON;