Re-enable XHR as fallback for fetch on webview (#22026)

In #22015 we switched `readAsync` to be based on fetch rather than XHR. However that broke the assumption in `getBinaryenPromise` that was assuming `readAsync` was XHR-based. This change reinstates the XHR fallback in the case of webviews where loading from `file://` URLs is not only possible but (apparently) common. Sadly we don't have any webview tests so I have no way to actually test this within our current frameworks.
emscripten-core · May 31, 2024 · 67fa4c1 · 67fa4c1
1 parent b0ec4e1
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diff --git a/src/preamble.js b/src/preamble.js
@@ -642,36 +642,21 @@ function getBinarySync(file) {
 
 function getBinaryPromise(binaryFile) {
 #if !SINGLE_FILE
-  // If we don't have the binary yet, try to load it asynchronously.
-  // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
-  // See https://github.com/github/fetch/pull/92#issuecomment-140665932
-  // Cordova or Electron apps are typically loaded from a file:// url.
-  // So use fetch if it is available and the url is not a file, otherwise fall back to XHR.
+  // If we don't have the binary yet, load it asynchronously using readAsync.
   if (!wasmBinary
 #if SUPPORT_BASE64_EMBEDDING
-      && !isDataURI(binaryFile)
-#endif
-      && (ENVIRONMENT_IS_WEB || ENVIRONMENT_IS_WORKER)) {
-    if (typeof fetch == 'function'
-#if ENVIRONMENT_MAY_BE_WEBVIEW
-      && !isFileURI(binaryFile)
-#endif
-    ) {
-      return fetch(binaryFile, {{{ makeModuleReceiveExpr('fetchSettings', "{ credentials: 'same-origin' }") }}}).then((response) => {
-        if (!response['ok']) {
-          throw `failed to load wasm binary file at '${binaryFile}'`;
-        }
-        return response['arrayBuffer']();
-      }).catch(() => getBinarySync(binaryFile));
-    }
-#if ENVIRONMENT_MAY_BE_WEBVIEW
-    else if (readAsync) {
-      // fetch is not available or url is file => try XHR (readAsync uses XHR internally)
-      return new Promise((resolve, reject) => {
-        readAsync(binaryFile, (response) => resolve(new Uint8Array(/** @type{!ArrayBuffer} */(response))), reject)
-      });
-    }
+      || isDataURI(binaryFile)
 #endif
+      ) {
+    // Fetch the binary use readAsync
+    return new Promise((resolve, reject) => {
+      readAsync(binaryFile,
+        (response) => resolve(new Uint8Array(/** @type{!ArrayBuffer} */(response))),
+        (error) => {
+          try { resolve(getBinarySync(binaryFile)); }
+          catch (e) { reject(e); }
+        });
+    });
   }
 #endif
 

diff --git a/src/web_or_worker_shell_read.js b/src/web_or_worker_shell_read.js
@@ -22,12 +22,35 @@
   }
 
   readAsync = (url, onload, onerror) => {
-    fetch(url)
+#if ENVIRONMENT_MAY_BE_WEBVIEW
+    // Fetch has some additional restrictions over XHR, like it can't be used on a file:// url.
+    // See https://github.com/github/fetch/pull/92#issuecomment-140665932
+    // Cordova or Electron apps are typically loaded from a file:// url.
+    // So use XHR on webview if URL is a file URL.
+    if (isFileURI(url)) {
+      var xhr = new XMLHttpRequest();
+      xhr.open('GET', url, true);
+      xhr.responseType = 'arraybuffer';
+      xhr.onload = () => {
+        if (xhr.status == 200 || (xhr.status == 0 && xhr.response)) { // file URLs can return 0
+          onload(xhr.response);
+          return;
+        }
+        onerror();
+      };
+      xhr.onerror = onerror;
+      xhr.send(null);
+      return;
+    }
+#elif ASSERTIONS
+    assert(!isFileURI(url), "readAsync does not work with file:// URLs");
+#endif
+    fetch(url, {{{ makeModuleReceiveExpr('fetchSettings', "{ credentials: 'same-origin' }") }}})
     .then((response) => {
       if (response.ok) {
         return response.arrayBuffer();
       }
-      return Promise.reject(new Error(response.statusText + ' : ' + response.url));
+      return Promise.reject(new Error(response.status + ' : ' + response.url));
     })
     .then(onload, onerror)
   };
diff --git a/test/other/metadce/test_metadce_cxx_ctors1.gzsize b/test/other/metadce/test_metadce_cxx_ctors1.gzsize
@@ -1 +1 @@
-9813
+9817
diff --git a/test/other/metadce/test_metadce_cxx_ctors1.jssize b/test/other/metadce/test_metadce_cxx_ctors1.jssize
@@ -1 +1 @@
-24096
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diff --git a/test/other/metadce/test_metadce_cxx_ctors2.gzsize b/test/other/metadce/test_metadce_cxx_ctors2.gzsize
@@ -1 +1 @@
-9797
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diff --git a/test/other/metadce/test_metadce_cxx_ctors2.jssize b/test/other/metadce/test_metadce_cxx_ctors2.jssize
@@ -1 +1 @@
-24064
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diff --git a/test/other/metadce/test_metadce_cxx_except.gzsize b/test/other/metadce/test_metadce_cxx_except.gzsize
@@ -1 +1 @@
-10897
+10895
diff --git a/test/other/metadce/test_metadce_cxx_except.jssize b/test/other/metadce/test_metadce_cxx_except.jssize
@@ -1 +1 @@
-28002
+28008
diff --git a/test/other/metadce/test_metadce_cxx_except_wasm.gzsize b/test/other/metadce/test_metadce_cxx_except_wasm.gzsize
@@ -1 +1 @@
-9777
+9774
diff --git a/test/other/metadce/test_metadce_cxx_except_wasm.jssize b/test/other/metadce/test_metadce_cxx_except_wasm.jssize
@@ -1 +1 @@
-23989
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diff --git a/test/other/metadce/test_metadce_cxx_except_wasm_exnref.gzsize b/test/other/metadce/test_metadce_cxx_except_wasm_exnref.gzsize
@@ -1 +1 @@
-9777
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diff --git a/test/other/metadce/test_metadce_cxx_except_wasm_exnref.jssize b/test/other/metadce/test_metadce_cxx_except_wasm_exnref.jssize
@@ -1 +1 @@
-23989
+23995
diff --git a/test/other/metadce/test_metadce_cxx_mangle.gzsize b/test/other/metadce/test_metadce_cxx_mangle.gzsize
@@ -1 +1 @@
-10904
+10900
diff --git a/test/other/metadce/test_metadce_cxx_mangle.jssize b/test/other/metadce/test_metadce_cxx_mangle.jssize
@@ -1 +1 @@
-28002
+28008
diff --git a/test/other/metadce/test_metadce_cxx_noexcept.gzsize b/test/other/metadce/test_metadce_cxx_noexcept.gzsize
@@ -1 +1 @@
-9813
+9817
diff --git a/test/other/metadce/test_metadce_cxx_noexcept.jssize b/test/other/metadce/test_metadce_cxx_noexcept.jssize
@@ -1 +1 @@
-24096
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diff --git a/test/other/metadce/test_metadce_cxx_wasmfs.jssize b/test/other/metadce/test_metadce_cxx_wasmfs.jssize
@@ -1 +1 @@
-11922
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diff --git a/test/other/metadce/test_metadce_files_js_fs.gzsize b/test/other/metadce/test_metadce_files_js_fs.gzsize
@@ -1 +1 @@
-7774
+7766
diff --git a/test/other/metadce/test_metadce_files_js_fs.jssize b/test/other/metadce/test_metadce_files_js_fs.jssize
@@ -1 +1 @@
-19120
+19126
diff --git a/test/other/metadce/test_metadce_files_wasmfs.gzsize b/test/other/metadce/test_metadce_files_wasmfs.gzsize
@@ -1 +1 @@
-3095
+3088
diff --git a/test/other/metadce/test_metadce_files_wasmfs.jssize b/test/other/metadce/test_metadce_files_wasmfs.jssize
@@ -1 +1 @@
-6672
+6680
diff --git a/test/other/metadce/test_metadce_hello_O0.gzsize b/test/other/metadce/test_metadce_hello_O0.gzsize
@@ -1 +1 @@
-8122
+8111
diff --git a/test/other/metadce/test_metadce_hello_O0.jssize b/test/other/metadce/test_metadce_hello_O0.jssize
@@ -1 +1 @@
-21887
+21927
diff --git a/test/other/metadce/test_metadce_hello_O1.gzsize b/test/other/metadce/test_metadce_hello_O1.gzsize
@@ -1 +1 @@
-2938
+2937
diff --git a/test/other/metadce/test_metadce_hello_O1.jssize b/test/other/metadce/test_metadce_hello_O1.jssize
@@ -1 +1 @@
-7529
+7568
diff --git a/test/other/metadce/test_metadce_hello_O2.gzsize b/test/other/metadce/test_metadce_hello_O2.gzsize
@@ -1 +1 @@
-2594
+2589
diff --git a/test/other/metadce/test_metadce_hello_O2.jssize b/test/other/metadce/test_metadce_hello_O2.jssize
@@ -1 +1 @@
-5362
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diff --git a/test/other/metadce/test_metadce_hello_O3.gzsize b/test/other/metadce/test_metadce_hello_O3.gzsize
@@ -1 +1 @@
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+2505
diff --git a/test/other/metadce/test_metadce_hello_O3.jssize b/test/other/metadce/test_metadce_hello_O3.jssize
@@ -1 +1 @@
-5208
+5216
diff --git a/test/other/metadce/test_metadce_hello_Os.gzsize b/test/other/metadce/test_metadce_hello_Os.gzsize
@@ -1 +1 @@
-2509
+2505
diff --git a/test/other/metadce/test_metadce_hello_Os.jssize b/test/other/metadce/test_metadce_hello_Os.jssize
@@ -1 +1 @@
-5208
+5216
diff --git a/test/other/metadce/test_metadce_hello_Oz.gzsize b/test/other/metadce/test_metadce_hello_Oz.gzsize
@@ -1 +1 @@
-2495
+2487
diff --git a/test/other/metadce/test_metadce_hello_Oz.jssize b/test/other/metadce/test_metadce_hello_Oz.jssize
@@ -1 +1 @@
-5175
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diff --git a/test/other/metadce/test_metadce_hello_dylink.gzsize b/test/other/metadce/test_metadce_hello_dylink.gzsize
@@ -1 +1 @@
-6405
+6409
diff --git a/test/other/metadce/test_metadce_hello_dylink.jssize b/test/other/metadce/test_metadce_hello_dylink.jssize
@@ -1 +1 @@
-14186
+14194
diff --git a/test/other/metadce/test_metadce_hello_export_nothing.gzsize b/test/other/metadce/test_metadce_hello_export_nothing.gzsize
@@ -1 +1 @@
-1862
+1858
diff --git a/test/other/metadce/test_metadce_hello_export_nothing.jssize b/test/other/metadce/test_metadce_hello_export_nothing.jssize
@@ -1 +1 @@
-3999
+4008
diff --git a/test/other/metadce/test_metadce_hello_wasmfs.gzsize b/test/other/metadce/test_metadce_hello_wasmfs.gzsize
@@ -1 +1 @@
-2509
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diff --git a/test/other/metadce/test_metadce_hello_wasmfs.jssize b/test/other/metadce/test_metadce_hello_wasmfs.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_libcxxabi_message_O3.gzsize b/test/other/metadce/test_metadce_libcxxabi_message_O3.gzsize
@@ -1 +1 @@
-2074
+2071
diff --git a/test/other/metadce/test_metadce_libcxxabi_message_O3.jssize b/test/other/metadce/test_metadce_libcxxabi_message_O3.jssize
@@ -1 +1 @@
-4433
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diff --git a/test/other/metadce/test_metadce_libcxxabi_message_O3_standalone.gzsize b/test/other/metadce/test_metadce_libcxxabi_message_O3_standalone.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_libcxxabi_message_O3_standalone.jssize b/test/other/metadce/test_metadce_libcxxabi_message_O3_standalone.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3.gzsize b/test/other/metadce/test_metadce_mem_O3.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3.jssize b/test/other/metadce/test_metadce_mem_O3.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_grow.gzsize b/test/other/metadce/test_metadce_mem_O3_grow.gzsize
@@ -1 +1 @@
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+2685
diff --git a/test/other/metadce/test_metadce_mem_O3_grow.jssize b/test/other/metadce/test_metadce_mem_O3_grow.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_grow_standalone.gzsize b/test/other/metadce/test_metadce_mem_O3_grow_standalone.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_grow_standalone.jssize b/test/other/metadce/test_metadce_mem_O3_grow_standalone.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone.gzsize b/test/other/metadce/test_metadce_mem_O3_standalone.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone.jssize b/test/other/metadce/test_metadce_mem_O3_standalone.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_lib.gzsize b/test/other/metadce/test_metadce_mem_O3_standalone_lib.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_lib.jssize b/test/other/metadce/test_metadce_mem_O3_standalone_lib.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_narg.gzsize b/test/other/metadce/test_metadce_mem_O3_standalone_narg.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_narg.jssize b/test/other/metadce/test_metadce_mem_O3_standalone_narg.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_narg_flto.gzsize b/test/other/metadce/test_metadce_mem_O3_standalone_narg_flto.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_mem_O3_standalone_narg_flto.jssize b/test/other/metadce/test_metadce_mem_O3_standalone_narg_flto.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_64.gzsize b/test/other/metadce/test_metadce_minimal_64.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_64.jssize b/test/other/metadce/test_metadce_minimal_64.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O0.gzsize b/test/other/metadce/test_metadce_minimal_O0.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O0.jssize b/test/other/metadce/test_metadce_minimal_O0.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O1.gzsize b/test/other/metadce/test_metadce_minimal_O1.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O1.jssize b/test/other/metadce/test_metadce_minimal_O1.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O2.gzsize b/test/other/metadce/test_metadce_minimal_O2.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O2.jssize b/test/other/metadce/test_metadce_minimal_O2.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O3.gzsize b/test/other/metadce/test_metadce_minimal_O3.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_O3.jssize b/test/other/metadce/test_metadce_minimal_O3.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_Os.gzsize b/test/other/metadce/test_metadce_minimal_Os.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_Os.jssize b/test/other/metadce/test_metadce_minimal_Os.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_Oz-ctors.gzsize b/test/other/metadce/test_metadce_minimal_Oz-ctors.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_Oz-ctors.jssize b/test/other/metadce/test_metadce_minimal_Oz-ctors.jssize
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diff --git a/test/other/metadce/test_metadce_minimal_Oz.gzsize b/test/other/metadce/test_metadce_minimal_Oz.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_Oz.jssize b/test/other/metadce/test_metadce_minimal_Oz.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_pthreads.gzsize b/test/other/metadce/test_metadce_minimal_pthreads.gzsize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_pthreads.jssize b/test/other/metadce/test_metadce_minimal_pthreads.jssize
@@ -1 +1 @@
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diff --git a/test/other/metadce/test_metadce_minimal_wasmfs.gzsize b/test/other/metadce/test_metadce_minimal_wasmfs.gzsize
@@ -1 +1 @@
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+1504
diff --git a/test/other/metadce/test_metadce_minimal_wasmfs.jssize b/test/other/metadce/test_metadce_minimal_wasmfs.jssize
@@ -1 +1 @@
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diff --git a/test/other/test_unoptimized_code_size.js.size b/test/other/test_unoptimized_code_size.js.size
@@ -1 +1 @@
-55401
+55440
diff --git a/test/other/test_unoptimized_code_size_no_asserts.js.size b/test/other/test_unoptimized_code_size_no_asserts.js.size
@@ -1 +1 @@
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diff --git a/test/other/test_unoptimized_code_size_strict.js.size b/test/other/test_unoptimized_code_size_strict.js.size
@@ -1 +1 @@
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+54303
diff --git a/test/test_browser.py b/test/test_browser.py
@@ -4331,7 +4331,7 @@ def test_small_js_flags(self):
     print('size:', size)
     # Note that this size includes test harness additions (for reporting the result, etc.).
     if not self.is_wasm64() and not self.is_2gb():
-      self.assertLess(abs(size - 4510), 100)
+      self.assertLess(abs(size - 4477), 100)
 
   # Tests that it is possible to initialize and render WebGL content in a
   # pthread by using OffscreenCanvas.