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function waitForLoad() {
return new Promise(resolve => addEventListener('load', resolve))
.then(() => delay(10));
}
function delay(timeout) {
return new Promise(resolve => step_timeout(() => resolve(), 10));
}
function busy(work) {
return delay(10).then(() => new Promise(resolve => {
step_timeout(() => {
let end = performance.now() + work;
while (performance.now() < end) {
}
resolve();
}, 1);
}));
}
function getThrottlingRate(delay) {
return new Promise(resolve => {
let start = performance.now();
setTimeout(() => {
let rate = Math.floor((performance.now() - start) / delay);
resolve(rate);
}, delay);
});
}
function addElement(t, element, src) {
return new Promise((resolve, reject) => {
let e = document.createElement(element);
e.addEventListener('load', () => resolve(e));
if (src) {
e.src = src;
}
document.body.appendChild(e);
t.add_cleanup(() => e.remove());
});
}
function inFrame(t) {
return addElement(t, "iframe", "resources/test.html")
.then(frame => delay(10).then(() => Promise.resolve(frame.contentWindow)));
}
function addWebSocket(t, url) {
return new Promise((resolve, reject) => {
let socket = new WebSocket(url);
socket.onopen = () => {
t.add_cleanup(() => socket.close());
resolve();
};
socket.onerror = reject;
});
}
function addRTCPeerConnection(t) {
return new Promise((resolve, reject) => {
let connection = new RTCPeerConnection();
t.add_cleanup(() => {
connection.close()
});
resolve();
});
}
function addIndexedDB(t) {
return new Promise((resolve, reject) => {
let iDBState = {
running: false,
db: null
};
let req = indexedDB.open("testDB", 1);
req.onupgradeneeded = e => {
let db = e.target.result;
let store = db.createObjectStore("testOS", {keyPath: "id"});
let index = store.createIndex("index", ["col"]);
};
req.onsuccess = e => {
let db = iDBState.db = e.target.result;
let store = db.transaction("testOS", "readwrite").objectStore("testOS");
let ctr = 0;
iDBState.running = true;
function putLoop() {
if (!iDBState.running) {
return;
}
let req = store.put({id: ctr++, col: "foo"});
req.onsuccess = putLoop;
if (!iDBState.request) {
iDBState.request = req;
}
}
putLoop();
resolve();
};
t.add_cleanup(() => {
iDBState.running = false;
iDBState.db && iDBState.db.close();
iDBState.db = null;
});
});
}
function addWebAudio(t) {
return new Promise(resolve => {
let context = new (window.AudioContext || window.webkitAudioContext)();
context.onstatechange = () => (context.state === "running") && resolve();
let gain = context.createGain();
gain.gain.value = 0.1;
gain.connect(context.destination);
let webaudionode = context.createOscillator();
webaudionode.type = 'square';
webaudionode.frequency.value = 440; // value in hertz
webaudionode.connect(gain);
webaudionode.start();
t.add_cleanup(() => webaudionode.stop());
});
}
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