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sync.js
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sync.js
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var Module = {};
function printStats() {
console.log(document.querySelectorAll('*').length, 'elements');
console.log(document.querySelectorAll('*[widget]').length, 'widgets');
}
function applyElementUpdate(element, update) {
if (update.hasOwnProperty("update-elements")) {
let childUpdates = update["update-elements"];
for (let i = 0; i < childUpdates.length; i++) {
let childUpdate = childUpdates[i];
let index = childUpdate["index"];
let child = element.childNodes.item(index);
if (child == null) {
console.log('Element child', index, 'not found in:');
console.log(element);
let parent = element.parentNode;
while(parent.id != 'host') {
console.log(parent);
parent = parent.parentNode;
}
}
applyElementUpdate(child, childUpdate);
}
}
let removes = null;
if (update.hasOwnProperty("remove")) {
removes = [];
let removeIndices = update["remove"];
for (let i = 0; i < removeIndices.length; i++) {
removes.push(element.childNodes.item(removeIndices[i]));
}
}
let moves = null;
if (update.hasOwnProperty("move")) {
moves = [];
let moveIndices = update["move"];
for (let i = 0; i < moveIndices.length; i++) {
moves.push(element.childNodes.item(moveIndices[i]));
}
}
let insertions = null;
let insertionPoints = null;
if (update.hasOwnProperty("insert")) {
insertions = [];
insertionPoints = [];
let descriptors = update["insert"];
for (let i = 0; i < descriptors.length; i++) {
let html = descriptors[i]["html"];
let insertionIndex = descriptors[i]["index"];
insertions.push(html);
insertionPoints.push(element.childNodes.item(insertionIndex));
}
}
if (update.hasOwnProperty("classes")) {
// TODO(yjbanov): properly diff the class list.
let classes = update['classes'];
if (classes.length > 0) {
element.className = "";
for (let i = 0; i < classes.length; i++) {
let className = classes[i];
if (className != '__clear__') {
element.classList.add(className);
}
}
}
}
if (removes != null) {
for (let i = 0; i < removes.length; i++) {
removes[i].remove();
}
}
if (moves != null) {
for (let i = 0; i < moves.length; i += 2) {
element.insertBefore(moves[i + 1], moves[i]);
}
}
if (insertions != null) {
for (let i = 0; i < insertions.length; i++) {
let template = document.createElement("template");
template.innerHTML = insertions[i];
element.insertBefore(template.content.firstChild, insertionPoints[i]);
}
}
if (update.hasOwnProperty("bid")) {
element.setAttribute("_bid", update["bid"]);
}
if (update.hasOwnProperty("text")) {
element.innerText = update["text"];
}
if (update.hasOwnProperty("attrs")) {
let attrs = update["attrs"];
for (let name in attrs) {
if (attrs.hasOwnProperty(name)) {
if (name == "value") {
element.value = attrs[name];
}
element.setAttribute(name, attrs[name]);
}
}
}
}
function printPerf(category, start, end) {
console.log('>>>', category, ':', end - start, 'ms');
}
let compileStart = 0;
function enteredMain() {
let compileEnd = performance.now();
printPerf('time to main', compileStart, compileEnd);
}
function allReady() {
console.timeStamp('In main');
let renderFrame = Module.cwrap('RenderFrame', 'string', []);
let dispatchEvent = Module.cwrap('DispatchEvent', 'void', ['string', 'string', 'string']);
let host = document.querySelector('#host');
function syncFromNative() {
console.log('>>> ====== syncFromNative =======');
console.timeStamp('Start frame build');
let renderStart = performance.now();
let json = renderFrame();
console.timeStamp('End frame build');
setTimeout(() => {
let renderFullEnd = performance.now();
printPerf('renderFull', renderStart, renderFullEnd);
}, 0);
let renderEnd = performance.now();
printPerf('renderFrame', renderStart, renderEnd);
console.log('>>> diff size: ', json.length);
let jsonParseStart = performance.now();
let diff = JSON.parse(json);
if (!diff) {
return;
}
console.timeStamp('Parse diff');
let jsonParseEnd = performance.now();
printPerf('parseJson', jsonParseStart, jsonParseEnd);
if (diff.hasOwnProperty("create")) {
let createStart = performance.now();
host.innerHTML = diff["create"];
let createEnd = performance.now();
printPerf('create', createStart, createEnd);
} else if (diff.hasOwnProperty("update")) {
let updateStart = performance.now();
applyElementUpdate(host.firstElementChild, diff["update"]);
let updateEnd = performance.now();
printPerf('update', updateStart, updateEnd);
}
console.timeStamp('End apply diff');
}
function serializeEvent(type, event) {
let data = {};
if (type == 'keyup') {
data['keyCode'] = event.keyCode;
}
if (event.target && event.target.value) {
data['value'] = event.target.value;
}
return JSON.stringify(data);
}
function handleEvent(type, event) {
// Look for the nearest parent with a _bid, then dispatch to it.
let bid = null;
let parent = event.target;
while(bid == null && parent && parent != document) {
bid = parent.getAttribute("_bid");
parent = parent.parentNode;
}
if (bid) {
dispatchEvent(type, bid, serializeEvent(type, event));
syncFromNative();
} else {
console.log(">>> caught event on target with no _bid:", event.target);
}
}
let eventTypes = ["click", "keyup"];
eventTypes.forEach((type) => {
host.addEventListener(type, function(event) {
handleEvent(type, event);
});
});
syncFromNative();
}
function openDB() {
return new Promise(function(resolve, reject) {
var dbOpen = indexedDB.open("WasmCache");
dbOpen.onerror = function(event) {
reject("Failed to open IndexedDB 'WasmCache'");
};
dbOpen.onupgradeneeded = function(event) {
var db = event.target.result;
db.createObjectStore("modules", { keyPath: "name" });
}
dbOpen.onsuccess = function(event) {
var db = event.target.result;
db.onerror = function(event) {
alert("Database error: " + event.target.errorCode);
};
resolve(db);
};
});
}
function loadModuleFromIndexedDB() {
return new Promise(function(resolve, reject) {
openDB().then(function(db) {
var transaction = db.transaction(["modules"], "readwrite");
var objectStore = transaction.objectStore("modules");
var getRequest = objectStore.get(window.location.pathname);
getRequest.onerror = function(event) {
console.log('[ERROR] Failed to load module from IDB', event);
reject(event);
};
getRequest.onsuccess = function(event) {
if (getRequest.result) {
resolve(getRequest.result.module);
} else {
resolve(null);
}
};
});
});
}
function storeModuleInIndexedDB(module) {
return new Promise(function(resolve, reject) {
openDB().then(function(db) {
var transaction = db.transaction(["modules"], "readwrite");
var objectStore = transaction.objectStore("modules");
var addRequest = objectStore.put({name: window.location.pathname, module: module});
addRequest.onerror = function(event) {
console.log('[ERROR] Failed to store module in IDB', event);
reject(event);
};
addRequest.onsuccess = function(event) {
if (addRequest.result) {
resolve(addRequest.result.module);
} else {
resolve(null);
}
};
});
});
}
function loadModuleFromNetwork(fileNameWithoutExtension) {
return fetch(`${fileNameWithoutExtension}.wasm`)
.then(function (response) {
return response.arrayBuffer();
})
.then(function (bytes) {
var beforeCompile = performance.now();
return WebAssembly.compile(bytes).then(function(module) {
var afterCompile = performance.now();
console.log('>>> wasm compile', afterCompile - beforeCompile);
return module;
});
});
}
let loadStart = null;
function bootstrapWasm(fileNameWithoutExtension, module, bytes) {
if (module) {
Module['module'] = module;
} else if (bytes) {
Module['wasmBinary'] = bytes;
}
let script = document.createElement('script');
script.src = `${fileNameWithoutExtension}.js`;
document.body.appendChild(script);
let loadEnd = performance.now();
printPerf('load', loadStart, loadEnd);
}
function loadApp(fileNameWithoutExtension) {
if(window.location.hash && window.location.hash.indexOf('idb') != -1) {
loadAppWithIDB(fileNameWithoutExtension);
} else {
loadAppWithoutIDB(fileNameWithoutExtension);
}
}
function loadAppWithoutIDB(fileNameWithoutExtension) {
loadStart = performance.now();
console.log('>>> loading from network');
return fetch(`${fileNameWithoutExtension}.wasm`)
.then(function (response) {
return response.arrayBuffer();
})
.then(function (bytes) {
bootstrapWasm(fileNameWithoutExtension, null, bytes);
});
}
function loadAppWithIDB(fileNameWithoutExtension) {
loadStart = performance.now();
loadModuleFromIndexedDB().then(function(module) {
if (module) {
loadIdb = performance.now();
console.log('>>> loaded from IndexedDB in ', loadIdb - loadStart, 'ms');
bootstrapWasm(fileNameWithoutExtension, module);
} else {
console.log('>>> loading from network');
loadModuleFromNetwork(fileNameWithoutExtension).then(function(module) {
storeModuleInIndexedDB(module).then(function(_) {
bootstrapWasm(fileNameWithoutExtension, module);
});
});
}
});
}