[release/8.0][browser] fix emscripten out/err overrides (#100818)

* backport of #100630

* fix

* fix

eng/testing/scenarios/BuildWasmAppsJobsList.txt

@@ -41,5 +41,5 @@ Wasm.Build.Tests.WasmRunOutOfAppBundleTests
 Wasm.Build.Tests.WasmSIMDTests
 Wasm.Build.Tests.WasmTemplateTests
 Wasm.Build.Tests.WorkloadTests
-Wasm.Build.Tests.TestAppScenarios.DownloadResourceProgressTests
+Wasm.Build.Tests.TestAppScenarios.ModuleConfigTests
 Wasm.Build.Tests.MT.Blazor.SimpleMultiThreadedTests

src/mono/sample/wasm/browser-advanced/main.js

@@ -59,6 +59,7 @@ try {
                 console.log('user code Module.onDotnetReady');
             },
             postRun: () => { console.log('user code Module.postRun'); },
+            out: (text) => { console.log("ADVANCED:" + text) },
         })
         .withResourceLoader((type, name, defaultUri, integrity, behavior) => {
             // loadBootResource could return string with unqualified name of resource. It assumes that we resolve it with document.baseURI

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

@@ -13,9 +13,9 @@
 
 namespace Wasm.Build.Tests.TestAppScenarios;
 
-public class DownloadResourceProgressTests : AppTestBase
+public class ModuleConfigTests : AppTestBase
 {
-    public DownloadResourceProgressTests(ITestOutputHelper output, SharedBuildPerTestClassFixture buildContext)
+    public ModuleConfigTests(ITestOutputHelper output, SharedBuildPerTestClassFixture buildContext)
         : base(output, buildContext)
     {
     }
@@ -25,7 +25,7 @@ public DownloadResourceProgressTests(ITestOutputHelper output, SharedBuildPerTes
     [InlineData(true)]
     public async Task DownloadProgressFinishes(bool failAssemblyDownload)
     {
-        CopyTestAsset("WasmBasicTestApp", $"DownloadResourceProgressTests_{failAssemblyDownload}");
+        CopyTestAsset("WasmBasicTestApp", $"ModuleConfigTests_DownloadProgressFinishes_{failAssemblyDownload}");
         PublishProject("Debug");
 
         var result = await RunSdkStyleApp(new(
@@ -54,4 +54,24 @@ public async Task DownloadProgressFinishes(bool failAssemblyDownload)
                 : "The download progress test did emit unexpected message about failing download"
         );
     }
+
+    [Fact]
+    public async Task OutErrOverrideWorks()
+    {
+        CopyTestAsset("WasmBasicTestApp", $"ModuleConfigTests_OutErrOverrideWorks");
+        PublishProject("Debug");
+
+        var result = await RunSdkStyleApp(new(
+            Configuration: "Debug",
+            TestScenario: "OutErrOverrideWorks"
+        ));
+        Assert.True(
+            result.ConsoleOutput.Any(m => m.Contains("Emscripten out override works!")),
+            "Emscripten out override doesn't work"
+        );
+        Assert.True(
+            result.ConsoleOutput.Any(m => m.Contains("Emscripten err override works!")),
+            "Emscripten err override doesn't work"
+        );
+    }
 }

src/mono/wasm/runtime/loader/assets.ts

@@ -12,6 +12,7 @@ import { mono_exit } from "./exit";
 import { addCachedReponse, findCachedResponse } from "./assetsCache";
 import { getIcuResourceName } from "./icu";
 import { makeURLAbsoluteWithApplicationBase } from "./polyfills";
+import { mono_log_info } from "./logging";
 
 
 let throttlingPromise: PromiseAndController<void> | undefined;
@@ -545,7 +546,7 @@ async function start_asset_download_sources(asset: AssetEntryInternal): Promise<
         err.status = response.status;
         throw err;
     } else {
-        loaderHelpers.out(`optional download '${response.url}' for ${asset.name} failed ${response.status} ${response.statusText}`);
+        mono_log_info(`optional download '${response.url}' for ${asset.name} failed ${response.status} ${response.statusText}`);
         return undefined;
     }
 }

src/mono/wasm/runtime/loader/icu.ts

@@ -1,6 +1,7 @@
 // Licensed to the .NET Foundation under one or more agreements.
 // The .NET Foundation licenses this file to you under the MIT license.
 
+import { mono_log_error } from "./logging";
 import { GlobalizationMode, MonoConfig } from "../types";
 import { ENVIRONMENT_IS_WEB, loaderHelpers } from "./globals";
 import { mono_log_info, mono_log_debug } from "./logging";
@@ -18,7 +19,7 @@ export function init_globalization() {
             loaderHelpers.preferredIcuAsset = null;
         } else {
             const msg = "invariant globalization mode is inactive and no ICU data archives are available";
-            loaderHelpers.err(`ERROR: ${msg}`);
+            mono_log_error(`ERROR: ${msg}`);
             throw new Error(msg);
         }
     }

src/mono/wasm/runtime/loader/run.ts

@@ -458,7 +458,7 @@ async function initializeModules(es6Modules: [RuntimeModuleExportsInternal, Nati
     const { default: emscriptenFactory } = es6Modules[1];
     setRuntimeGlobals(globalObjectsRoot);
     initializeExports(globalObjectsRoot);
-    await configureRuntimeStartup();
+    await configureRuntimeStartup(globalObjectsRoot.module);
     loaderHelpers.runtimeModuleLoaded.promise_control.resolve();
 
     emscriptenFactory((originalModule: EmscriptenModuleInternal) => {

src/mono/wasm/runtime/startup.ts

@@ -39,7 +39,23 @@ import { assertNoProxies } from "./gc-handles";
 // default size if MonoConfig.pthreadPoolSize is undefined
 const MONO_PTHREAD_POOL_SIZE = 4;
 
-export async function configureRuntimeStartup(): Promise<void> {
+export async function configureRuntimeStartup (module: DotnetModuleInternal): Promise<void> {
+    if (!module.out) {
+        // eslint-disable-next-line no-console
+        module.out = console.log.bind(console);
+    }
+    if (!module.err) {
+        // eslint-disable-next-line no-console
+        module.err = console.error.bind(console);
+    }
+    if (!module.print) {
+        module.print = module.out;
+    }
+    if (!module.printErr) {
+        module.printErr = module.err;
+    }
+    loaderHelpers.out = module.print;
+    loaderHelpers.err = module.printErr;
     await init_polyfills_async();
     await checkMemorySnapshotSize();
 }
@@ -54,17 +70,6 @@ export function configureEmscriptenStartup(module: DotnetModuleInternal): void {
         module.locateFile = module.__locateFile = (path) => loaderHelpers.scriptDirectory + path;
     }
 
-    if (!module.out) {
-        // eslint-disable-next-line no-console
-        module.out = console.log.bind(console);
-    }
-
-    if (!module.err) {
-        // eslint-disable-next-line no-console
-        module.err = console.error.bind(console);
-    }
-    loaderHelpers.out = module.out;
-    loaderHelpers.err = module.err;
     module.mainScriptUrlOrBlob = loaderHelpers.scriptUrl;// this is needed by worker threads
 
     // these all could be overridden on DotnetModuleConfig, we are chaing them to async below, as opposed to emscripten

src/mono/wasm/runtime/types/internal.ts

@@ -464,6 +464,8 @@ export declare interface EmscriptenModuleInternal {
     runtimeKeepalivePush(): void;
     runtimeKeepalivePop(): void;
     maybeExit(): void;
+    print(message: string): void;
+    printErr(message: string): void;
 }
 
 /// A PromiseController encapsulates a Promise together with easy access to its resolve and reject functions.
@@ -492,7 +494,7 @@ export type setGlobalObjectsType = (globalObjects: GlobalObjects) => void;
 export type initializeExportsType = (globalObjects: GlobalObjects) => RuntimeAPI;
 export type initializeReplacementsType = (replacements: EmscriptenReplacements) => void;
 export type configureEmscriptenStartupType = (module: DotnetModuleInternal) => void;
-export type configureRuntimeStartupType = () => Promise<void>;
+export type configureRuntimeStartupType = (module: DotnetModuleInternal) => Promise<void>;
 export type configureWorkerStartupType = (module: DotnetModuleInternal) => Promise<void>
 
 
@@ -508,4 +510,4 @@ export type RuntimeModuleExportsInternal = {
 
 export type NativeModuleExportsInternal = {
     default: (unificator: Function) => EmscriptenModuleInternal
-}
+}

src/mono/wasm/testassets/WasmBasicTestApp/App/Common/Program.cs

@@ -2,3 +2,4 @@
 // The .NET Foundation licenses this file to you under the MIT license.
 
 System.Console.WriteLine("WasmBasicTestApp");
+System.Console.Error.WriteLine("WasmBasicTestApp stderr");

src/mono/wasm/testassets/WasmBasicTestApp/App/wwwroot/main.js

@@ -63,6 +63,18 @@ switch (testCase) {
             }
         });
         break;
+    case "OutErrOverrideWorks":
+        dotnet.withModuleConfig({
+            out: (message) => {
+                console.log("Emscripten out override works!");
+                console.log(message)
+            },
+            err: (message) => {
+                console.error("Emscripten err override works!");
+                console.error(message)
+            },
+        });
+        break;
 }
 
 const { getAssemblyExports, getConfig, INTERNAL } = await dotnet.create();
@@ -94,6 +106,9 @@ try {
         case "DownloadResourceProgressTest":
             exit(0);
             break;
+        case "OutErrOverrideWorks":
+            dotnet.run();
+            break;
         default:
             console.error(`Unknown test case: ${testCase}`);
             exit(3);