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index.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
body {
font-family: monospace;
}
</style>
</head>
<body>
<script type="module">
import partysocket from 'https://cdn.jsdelivr.net/npm/[email protected]/+esm';
// const PARTYKIT_HOST = "http://127.0.0.1:1999";
const PARTYKIT_HOST = "https://test.a-saq.partykit.dev";
let conn;
async function connect() {
return new Promise((resolve) => {
conn = new partysocket({
host: PARTYKIT_HOST,
room: `room`,
});
conn.addEventListener("open", () => {
resolve(conn);
});
})
}
let i = 0;
function send(type, payload = {}) {
conn.send(JSON.stringify({
type,
payload: {
...payload,
timestamp: Date.now(),
packetId: i++,
}
}));
}
async function start() {
await connect();
conn.addEventListener("message", packet => {
try {
const data = JSON.parse(packet.data);
const container = document.createElement("div");
container.style.display = "flex";
container.style.gap = "8px";
const label = document.createElement("p");
label.innerHTML = `Packet <b>#${ data.payload.packetId }</b>`;
container.appendChild(label);
const serverDeltaElement = document.createElement("p");
const serverDelta = data.payload.timestamp - data.payload.prevTimestamp;
serverDeltaElement.innerHTML = `Server delta: <b>${ serverDelta }ms</b>`;
container.appendChild(serverDeltaElement);
const clientDeltaElement = document.createElement("p");
const clientDelta = data.payload.clientTimestamp - data.payload.prevClientTimestamp;
clientDeltaElement.innerHTML = `Client delta: <b>${ clientDelta }ms</b>`;
container.appendChild(clientDeltaElement);
if (serverDelta < clientDelta) {
const errorElement = document.createElement("p");
if (serverDelta + 100 < clientDelta) {
errorElement.innerText = `big error`;
} else {
errorElement.innerText = `error`;
}
errorElement.style.color = "red";
container.appendChild(errorElement);
}
document.body.appendChild(container)
window.scrollTo(0, document.body.getBoundingClientRect().height)
} catch (err) {
console.log("eroror", err)
}
});
setInterval(() => {
send("ping");
}, 1000)
}
start()
</script>
</body>
</html>