[browser] Integrate DevServer into WasmAppHost

src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/Microsoft.NET.Sdk.WebAssembly.Pack.pkgproj

@@ -7,8 +7,20 @@
 
   <ItemGroup>
     <ProjectReference Include="$(RepoTasksDir)Microsoft.NET.Sdk.WebAssembly.Pack.Tasks\Microsoft.NET.Sdk.WebAssembly.Pack.Tasks.csproj" />
+    <ProjectReference Include="$(RepoRoot)src\mono\wasm\host\WasmAppHost.csproj" />
     <PackageFile Include="build\*.props;build\*.targets;build\*.web.config" TargetPath="build" />
   </ItemGroup>
 
+  <Target Name="_PrepareForPack" BeforeTargets="GetPackageFiles">
+    <ItemGroup>
+      <PackageFile Include="$(SdkTargetsPath)" TargetPath="Sdk" />
+
+      <_WasmAppHostFiles Include="$(WasmAppHostDir)\*" TargetPath="WasmAppHost" />
+      <PackageFile Include="@(_WasmAppHostFiles)" />
+    </ItemGroup>
+
+    <Error Text="Could not find WasmAppHost files in $(WasmAppHostDir)" Condition="@(_WasmAppHostFiles->Count()) == 0" />
+  </Target>
+
   <Import Project="$([MSBuild]::GetPathOfFileAbove(Directory.Build.targets))" />
 </Project>

src/mono/nuget/Microsoft.NET.Sdk.WebAssembly.Pack/build/Microsoft.NET.Sdk.WebAssembly.Browser.targets

@@ -11,6 +11,19 @@ Copyright (c) .NET Foundation. All rights reserved.
 -->
 <Project ToolsVersion="14.0">
 
+  <PropertyGroup>
+    <_UseBlazorDevServer>$(RunArguments.Contains('blazor-devserver.dll').ToString().ToLower())</_UseBlazorDevServer>
+  </PropertyGroup>
+  <PropertyGroup Condition="'$(_WebAssemblyUserRunParameters)' == '' and '$(_UseBlazorDevServer)' == 'false'">
+    <RunCommand Condition="'$(DOTNET_HOST_PATH)' != '' and Exists($(DOTNET_HOST_PATH))">$(DOTNET_HOST_PATH)</RunCommand>
+    <RunCommand Condition="'$(RunCommand)' == ''">dotnet</RunCommand>
+
+    <WasmAppHostDir>$([MSBuild]::NormalizeDirectory($(MSBuildThisFileDirectory), '..', 'WasmAppHost'))</WasmAppHostDir>
+    <_RuntimeConfigJsonPath>$([MSBuild]::NormalizePath($(OutputPath), '$(AssemblyName).runtimeconfig.json'))</_RuntimeConfigJsonPath>
+    <RunArguments>exec &quot;$([MSBuild]::NormalizePath($(WasmAppHostDir), 'WasmAppHost.dll'))&quot; --use-staticwebassets --runtime-config &quot;$(_RuntimeConfigJsonPath)&quot; $(WasmHostArguments)</RunArguments>
+    <RunWorkingDirectory>$(OutputPath)</RunWorkingDirectory>
+  </PropertyGroup>
+
   <PropertyGroup>
     <EnableDefaultContentItems Condition=" '$(EnableDefaultContentItems)' == '' ">true</EnableDefaultContentItems>
 
@@ -61,7 +74,6 @@ Copyright (c) .NET Foundation. All rights reserved.
 
     <!-- Turn off parts of the build that do not apply to WASM projects -->
     <GenerateDependencyFile>false</GenerateDependencyFile>
-    <GenerateRuntimeConfigurationFiles>false</GenerateRuntimeConfigurationFiles>
     <PreserveCompilationContext>false</PreserveCompilationContext>
     <PreserveCompilationReferences>false</PreserveCompilationReferences>
     <IsWebConfigTransformDisabled>true</IsWebConfigTransformDisabled>

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/AppSettingsTests.cs

@@ -30,7 +30,6 @@ public async Task LoadAppSettingsBasedOnApplicationEnvironment(string applicatio
 
         var result = await RunSdkStyleApp(new(
             Configuration: "Debug",
-            ForPublish: true,
             TestScenario: "AppSettingsTest",
             BrowserQueryString: new Dictionary<string, string> { ["applicationEnvironment"] = applicationEnvironment }
         ));

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/AppTestBase.cs

@@ -57,8 +57,8 @@ protected string GetBinLogFilePath(string suffix = null)
 
     protected async Task<RunResult> RunSdkStyleApp(RunOptions options)
     {
-        string runArgs = $"{s_xharnessRunnerCommand} wasm webserver --app=. --web-server-use-default-files";
-        string workingDirectory = Path.GetFullPath(Path.Combine(FindBlazorBinFrameworkDir(options.Configuration, forPublish: options.ForPublish), ".."));
+        string runArgs = $"run -c {options.Configuration}";
+        string workingDirectory = _projectDir;
 
         using var runCommand = new RunCommand(s_buildEnv, _testOutput)
             .WithWorkingDirectory(workingDirectory);
@@ -123,7 +123,6 @@ protected record RunOptions(
         string Configuration,
         string TestScenario,
         Dictionary<string, string> BrowserQueryString = null,
-        bool ForPublish = false,
         Action<IConsoleMessage, IPage> OnConsoleMessage = null,
         int? ExpectedExitCode = 0
     );

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/DownloadResourceProgressTests.cs

@@ -30,7 +30,6 @@ public async Task DownloadProgressFinishes(bool failAssemblyDownload)
 
         var result = await RunSdkStyleApp(new(
             Configuration: "Debug",
-            ForPublish: true,
             TestScenario: "DownloadResourceProgressTest",
             BrowserQueryString: new Dictionary<string, string> { ["failAssemblyDownload"] = failAssemblyDownload.ToString().ToLowerInvariant() }
         ));

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/LazyLoadingTests.cs

@@ -26,7 +26,7 @@ public async Task LoadLazyAssemblyBeforeItIsNeeded()
         CopyTestAsset("WasmBasicTestApp", "LazyLoadingTests");
         PublishProject("Debug");
 
-        var result = await RunSdkStyleApp(new(Configuration: "Debug", ForPublish: true, TestScenario: "LazyLoadingTest"));
+        var result = await RunSdkStyleApp(new(Configuration: "Debug", TestScenario: "LazyLoadingTest"));
         Assert.True(result.TestOutput.Any(m => m.Contains("FirstName")), "The lazy loading test didn't emit expected message with JSON");
     }
 
@@ -38,7 +38,6 @@ public async Task FailOnMissingLazyAssembly()
 
         var result = await RunSdkStyleApp(new(
             Configuration: "Debug",
-            ForPublish: true,
             TestScenario: "LazyLoadingTest",
             BrowserQueryString: new Dictionary<string, string> { ["loadRequiredAssembly"] = "false" },
             ExpectedExitCode: 1

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/LibraryInitializerTests.cs

@@ -29,7 +29,7 @@ public async Task LoadLibraryInitializer()
         CopyTestAsset("WasmBasicTestApp", "LibraryInitializerTests_LoadLibraryInitializer");
         PublishProject("Debug");
 
-        var result = await RunSdkStyleApp(new(Configuration: "Debug", ForPublish: true, TestScenario: "LibraryInitializerTest"));
+        var result = await RunSdkStyleApp(new(Configuration: "Debug", TestScenario: "LibraryInitializerTest"));
         Assert.Collection(
             result.TestOutput,
             m => Assert.Equal("LIBRARY_INITIALIZER_TEST = 1", m)
@@ -44,7 +44,6 @@ public async Task AbortStartupOnError()
 
         var result = await RunSdkStyleApp(new(
             Configuration: "Debug",
-            ForPublish: true,
             TestScenario: "LibraryInitializerTest",
             BrowserQueryString: new Dictionary<string, string> { ["throwError"] = "true" },
             ExpectedExitCode: 1

src/mono/wasm/Wasm.Build.Tests/TestAppScenarios/SatelliteLoadingTests.cs

@@ -27,9 +27,8 @@ public SatelliteLoadingTests(ITestOutputHelper output, SharedBuildPerTestClassFi
     public async Task LoadSatelliteAssembly()
     {
         CopyTestAsset("WasmBasicTestApp", "SatelliteLoadingTests");
-        PublishProject("Debug");
 
-        var result = await RunSdkStyleApp(new(Configuration: "Debug", ForPublish: true, TestScenario: "SatelliteAssembliesTest"));
+        var result = await RunSdkStyleApp(new(Configuration: "Debug", TestScenario: "SatelliteAssembliesTest"));
         Assert.Collection(
             result.TestOutput,
             m => Assert.Equal("default: hello", m),

src/mono/wasm/host/BrowserArguments.cs

@@ -4,6 +4,7 @@
 #nullable enable
 
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.Text.Json;
 using Mono.Options;
 
@@ -37,8 +38,8 @@ public void ParseJsonProperties(IDictionary<string, JsonElement>? properties)
             ForwardConsoleOutput = forwardConsoleElement.GetBoolean();
     }
 
+    [SuppressMessage("Performance", "CA1822:Mark members as static", Justification = "Needs to validate instance members")]
     public void Validate()
     {
-        CommonConfiguration.CheckPathOrInAppPath(CommonConfig.AppPath, HTMLPath, "html-path");
     }
 }

src/mono/wasm/host/BrowserHost.cs

@@ -4,14 +4,17 @@
 using System;
 using System.Collections;
 using System.Collections.Generic;
+using System.Diagnostics.CodeAnalysis;
 using System.IO;
+using System.Linq;
 using System.Net.WebSockets;
 using System.Text;
 using System.Threading;
 using System.Threading.Tasks;
 using System.Web;
 using Microsoft.AspNetCore.Hosting;
 using Microsoft.Extensions.Logging;
+using Microsoft.WebAssembly.AppHost.DevServer;
 using Microsoft.WebAssembly.Diagnostics;
 
 #nullable enable
@@ -44,7 +47,7 @@ public static async Task<int> InvokeAsync(CommonConfiguration commonArgs,
 
     private async Task RunAsync(ILoggerFactory loggerFactory, CancellationToken token)
     {
-        if (_args.CommonConfig.Debugging)
+        if (_args.CommonConfig.Debugging && !_args.CommonConfig.UseStaticWebAssets)
         {
             ProxyOptions options = _args.CommonConfig.ToProxyOptions();
             _ = Task.Run(() => DebugProxyHost.RunDebugProxyAsync(options, Array.Empty<string>(), loggerFactory, token), token)
@@ -75,8 +78,7 @@ private async Task RunAsync(ILoggerFactory loggerFactory, CancellationToken toke
                             ? aspnetUrls.Split(';', StringSplitOptions.RemoveEmptyEntries)
                             : new string[] { $"http://127.0.0.1:{_args.CommonConfig.HostProperties.WebServerPort}", "https://127.0.0.1:0" };
 
-        (ServerURLs serverURLs, IWebHost host) = await StartWebServerAsync(_args.CommonConfig.AppPath,
-                                                                           _args.ForwardConsoleOutput ?? false,
+        (ServerURLs serverURLs, IWebHost host) = await StartWebServerAsync(_args,
                                                                            urls,
                                                                            token);
 
@@ -85,32 +87,104 @@ private async Task RunAsync(ILoggerFactory loggerFactory, CancellationToken toke
         foreach (string url in fullUrls)
             Console.WriteLine($"App url: {url}");
 
+        if (serverURLs.DebugPath != null)
+        {
+            Console.WriteLine($"Debug at url: {BuildUrl(serverURLs.Http, serverURLs.DebugPath, string.Empty)}");
+
+            if (serverURLs.Https != null)
+                Console.WriteLine($"Debug at url: {BuildUrl(serverURLs.Https, serverURLs.DebugPath, string.Empty)}");
+        }
+
         await host.WaitForShutdownAsync(token);
     }
 
-    private async Task<(ServerURLs, IWebHost)> StartWebServerAsync(string appPath, bool forwardConsole, string[] urls, CancellationToken token)
+    private async Task<(ServerURLs, IWebHost)> StartWebServerAsync(BrowserArguments args, string[] urls, CancellationToken token)
     {
-        WasmTestMessagesProcessor? logProcessor = null;
-        if (forwardConsole)
+        Func<WebSocket, Task>? onConsoleConnected = null;
+        if (args.ForwardConsoleOutput ?? false)
         {
-            logProcessor = new(_logger);
+            WasmTestMessagesProcessor logProcessor = new(_logger);
+            onConsoleConnected = socket => RunConsoleMessagesPump(socket, logProcessor!, token);
         }
 
-        WebServerOptions options = new
-        (
-            OnConsoleConnected: forwardConsole
-                                    ? socket => RunConsoleMessagesPump(socket, logProcessor!, token)
-                                    : null,
-            ContentRootPath: Path.GetFullPath(appPath),
-            WebServerUseCors: true,
-            WebServerUseCrossOriginPolicy: true,
-            Urls: urls
-        );
-
-        (ServerURLs serverURLs, IWebHost host) = await WebServer.StartAsync(options, _logger, token);
-        return (serverURLs, host);
+        // If we are using new browser template, use dev server
+        if (args.CommonConfig.UseStaticWebAssets)
+        {
+            DevServerOptions devServerOptions = CreateDevServerOptions(args, urls, onConsoleConnected);
+            return await DevServer.DevServer.StartAsync(devServerOptions, _logger, token);
+        }
+
+        // Otherwise for old template, use web server
+        WebServerOptions webServerOptions = CreateWebServerOptions(urls, args.CommonConfig.AppPath, onConsoleConnected);
+        return await WebServer.StartAsync(webServerOptions, _logger, token);
     }
 
+    private static WebServerOptions CreateWebServerOptions(string[] urls, string appPath, Func<WebSocket, Task>? onConsoleConnected) => new
+    (
+        OnConsoleConnected: onConsoleConnected,
+        ContentRootPath: Path.GetFullPath(appPath),
+        WebServerUseCors: true,
+        WebServerUseCrossOriginPolicy: true,
+        Urls: urls
+    );
+
+    private static DevServerOptions CreateDevServerOptions(BrowserArguments args, string[] urls, Func<WebSocket, Task>? onConsoleConnected)
+    {
+        const string staticWebAssetsV1Extension = ".StaticWebAssets.xml";
+        const string staticWebAssetsV2Extension = ".staticwebassets.runtime.json";
+
+        DevServerOptions? devServerOptions = null;
+
+        string appPath = args.CommonConfig.AppPath;
+        if (args.CommonConfig.HostProperties.MainAssembly != null)
+        {
+            // If we have main assembly name, try to find static web assets manifest by precise name.
+
+            var mainAssemblyPath = Path.Combine(appPath, args.CommonConfig.HostProperties.MainAssembly);
+            var staticWebAssetsPath = Path.ChangeExtension(mainAssemblyPath, staticWebAssetsV2Extension);
+            if (File.Exists(staticWebAssetsPath))
+            {
+                devServerOptions = CreateDevServerOptions(urls, staticWebAssetsPath, onConsoleConnected);
+            }
+            else
+            {
+                staticWebAssetsPath = Path.ChangeExtension(mainAssemblyPath, staticWebAssetsV1Extension);
+                if (File.Exists(staticWebAssetsPath))
+                    devServerOptions = CreateDevServerOptions(urls, staticWebAssetsPath, onConsoleConnected);
+            }
+
+            if (devServerOptions == null)
+                devServerOptions = CreateDevServerOptions(urls, mainAssemblyPath, onConsoleConnected);
+        }
+        else
+        {
+            // If we don't have main assembly name, try to find static web assets manifest by search in the directory.
+
+            var staticWebAssetsPath = FindFirstFileWithExtension(appPath, staticWebAssetsV2Extension)
+                ?? FindFirstFileWithExtension(appPath, staticWebAssetsV1Extension);
+
+            if (staticWebAssetsPath != null)
+                devServerOptions = CreateDevServerOptions(urls, staticWebAssetsPath, onConsoleConnected);
+
+            if (devServerOptions == null)
+                throw new CommandLineException("Please, provide mainAssembly in hostProperties of runtimeconfig");
+        }
+
+        return devServerOptions;
+    }
+
+    private static DevServerOptions CreateDevServerOptions(string[] urls, string staticWebAssetsPath, Func<WebSocket, Task>? onConsoleConnected) => new
+    (
+        OnConsoleConnected: onConsoleConnected,
+        StaticWebAssetsPath: staticWebAssetsPath,
+        WebServerUseCors: true,
+        WebServerUseCrossOriginPolicy: true,
+        Urls: urls
+    );
+
+    private static string? FindFirstFileWithExtension(string directory, string extension)
+        => Directory.EnumerateFiles(directory, "*" + extension).First();
+
     private async Task RunConsoleMessagesPump(WebSocket socket, WasmTestMessagesProcessor messagesProcessor, CancellationToken token)
     {
         byte[] buff = new byte[4000];
@@ -169,7 +243,7 @@ private string[] BuildUrls(ServerURLs serverURLs, IEnumerable<string> passThroug
         }
 
         string query = sb.ToString();
-        string filename = Path.GetFileName(_args.HTMLPath!);
+        string? filename = _args.HTMLPath != null ? Path.GetFileName(_args.HTMLPath) : null;
         string httpUrl = BuildUrl(serverURLs.Http, filename, query);
 
         return string.IsNullOrEmpty(serverURLs.Https)
@@ -179,12 +253,18 @@ private string[] BuildUrls(ServerURLs serverURLs, IEnumerable<string> passThroug
                     httpUrl,
                     BuildUrl(serverURLs.Https!, filename, query)
                 });
+    }
 
-        static string BuildUrl(string baseUrl, string htmlFileName, string query)
-            => new UriBuilder(baseUrl)
-            {
-                Query = query,
-                Path = htmlFileName
-            }.ToString();
+    private static string BuildUrl(string baseUrl, string? htmlFileName, string query)
+    {
+        var uriBuilder = new UriBuilder(baseUrl)
+        {
+            Query = query
+        };
+
+        if (htmlFileName != null)
+            uriBuilder.Path = htmlFileName;
+
+        return uriBuilder.ToString();
     }
 }