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Fall back to legacy asm.js Olm

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This commit is contained in:
David Baker 2018-10-04 20:11:34 +01:00
parent 30f0a7932b
commit c5ee92f4c3
2 changed files with 38 additions and 13 deletions
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1
scripts/copy-res.js
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@ -61,6 +61,7 @@ const COPY_LIST = [
// in the bundle dir with the js to avoid caching issues giving us wasm that
// doesn't match our js, but I cannot find any way to get webpack to do this.
["node_modules/olm/olm.wasm", "webapp", { directwatch: 1 }],
["node_modules/olm/olm_legacy.js", "webapp", { directwatch: 1 }],
["./config.json", "webapp", { directwatch: 1 }],
];

50
src/vector/index.js
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@ -229,19 +229,7 @@ async function loadApp() {
window.addEventListener('hashchange', onHashChange);
/* Start loading Olm. Note that we *don't* wait for this to load: the
* js-sdk will also call this and actually wait on the promise before it
* tries to use the library. It can be loading its wasm while the rest of
* the app loads though.
*
* We also need to tell the Olm js to look for its wasm file at the same
* level as index.html. It really should be in the same place as the js,
* ie. in the bundle directory, to avoid caching issues, but as far as I
* can tell this is completely impossible with webpack.
*/
Olm.init({
locateFile: () => 'olm.wasm',
});
await loadOlm();
await loadLanguage();
@ -365,6 +353,42 @@ async function loadApp() {
}
}
function loadOlm() {
/* Load Olm. We try the WebAssembly version first, and then the legacy,
* asm.js version if that fails. For this reason we need to wait for this
* to finish before continuing to load the rest of the app. In future
* we could somehow pass a promise down to react-sdk and have it wait on
* that so olm can be loading in parallel with the rest of the app.
*
* We also need to tell the Olm js to look for its wasm file at the same
* level as index.html. It really should be in the same place as the js,
* ie. in the bundle directory, to avoid caching issues, but as far as I
* can tell this is completely impossible with webpack.
*/
return Olm.init({
locateFile: () => 'olm.wasm',
}).then(() => {
console.log("Using WebAssembly Olm");
}).catch((e) => {
console.log("Failed to load Olm: trying legacy version");
return new Promise((resolve, reject) => {
const s = document.createElement('script');
s.src = 'olm_legacy.js';
s.onload = resolve;
s.onerror = reject;
document.body.appendChild(s);
}).then(() => {
// Init window.Olm, ie. the one just loaded by the script tag,
// not 'Olm' which is still the failed wasm version.
return window.Olm.init();
}).then(() => {
console.log("Using legacy Olm");
}).catch((e) => {
console.log("Both WebAssembly and asm.js Olm failed!", e);
});
});
}
async function loadLanguage() {
const prefLang = SettingsStore.getValue("language", null, /*excludeDefault=*/true);
let langs = [];