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Copy pathcommon.js
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149 lines (121 loc) · 3.25 KB
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(function() {
let wsUrl = /[\?&]OVERLAY_WS=([^&]+)/.exec(location.href);
let ws = null;
let queue = [];
let rseqCounter = 0;
let responsePromises = {};
let subscribers = {};
let sendMessage = null;
let eventsStarted = false;
if (wsUrl) {
sendMessage = (obj) => {
if (queue)
queue.push(obj);
else
ws.send(JSON.stringify(obj));
};
function connectWs() {
ws = new WebSocket(wsUrl[1]);
ws.addEventListener('error', (e) => {
console.error(e);
});
ws.addEventListener('open', () => {
console.log('Connected!');
let q = queue;
queue = null;
for (let msg of q)
sendMessage(msg);
});
ws.addEventListener('message', (msg) => {
try {
msg = JSON.parse(msg.data);
} catch (e) {
console.error('Invalid message received: ', msg);
return;
}
if (msg.rseq !== undefined && responsePromises[msg.rseq]) {
responsePromises[msg.rseq](msg);
delete responsePromises[msg.rseq];
} else {
processEvent(msg);
}
});
ws.addEventListener('close', () => {
queue = [];
console.log('Trying to reconnect...');
// Don't spam the server with retries.
setTimeout(() => {
connectWs();
}, 300);
});
}
connectWs();
} else {
sendMessage = (obj, cb) => {
if (queue)
queue.push([obj, cb]);
else
OverlayPluginApi.callHandler(JSON.stringify(obj), cb);
};
function waitForApi() {
if (!window.OverlayPluginApi || !window.OverlayPluginApi.ready) {
setTimeout(waitForApi, 300);
return;
}
let q = queue;
queue = null;
window.__OverlayCallback = processEvent;
for (let [msg, resolve] of q)
sendMessage(msg, resolve);
}
waitForApi();
}
function processEvent(msg) {
if (subscribers[msg.type]) {
for (let sub of subscribers[msg.type])
sub(msg);
}
}
window.addOverlayListener = (event, cb) => {
if (eventsStarted && subscribers[event]) {
console.warn(`A new listener for ${event} has been registered after event transmission has already begun.
Some events might have been missed and no cached values will be transmitted.
Please register your listeners before calling startOverlayEvents().`);
}
if (!subscribers[event]) {
subscribers[event] = [];
}
subscribers[event].push(cb);
};
window.removeOverlayListener = (event, cb) => {
if (subscribers[event]) {
let list = subscribers[event];
let pos = list.indexOf(cb);
if (pos > -1) list.splice(pos, 1);
}
};
window.callOverlayHandler = (msg) => {
let p;
if (ws) {
msg.rseq = rseqCounter++;
p = new Promise((resolve) => {
responsePromises[msg.rseq] = resolve;
});
sendMessage(msg);
} else {
p = new Promise((resolve) => {
sendMessage(msg, (data) => {
resolve(data == null ? null : JSON.parse(data));
});
});
}
return p;
};
window.startOverlayEvents = () => {
eventsStarted = false;
sendMessage({
call: 'subscribe',
events: Object.keys(subscribers),
});
};
})();