js-waku-examples/examples/store-js/index.html

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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta content="width=device-width, initial-scale=1.0" name="viewport" />
<title>JS-Waku store script tag example</title>
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<link rel="apple-touch-icon" href="./favicon.png" />
<link rel="manifest" href="./manifest.json" />
<link rel="icon" href="./favicon.ico" />
</head>
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<body>
<div><h1>Timestamp of the latest message seen in store</h1></div>
<div id="timestamp"></div>
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<script type="module">
import {
defaultLibp2p,
defaultPeerDiscovery,
WakuNode,
waitForRemotePeer,
createDecoder,
waku
} from "https://unpkg.com/@waku/sdk@0.0.18/bundle/index.js";
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/**
* This example demonstrates how to use the js-waku minified bundle
* available on unpkg.com.
*
* It is a simple script that uses Waku Store to retrieve ping relay messages
* and displays the timestamp of the most recent ping relay message.
*/
const timestampDiv = document.getElementById("timestamp");
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timestampDiv.innerHTML = "<p>Creating waku.</p>";
const libp2p = await defaultLibp2p(undefined, {
peerDiscovery: [defaultPeerDiscovery()],
});
const store = waku.wakuStore();
const node = new WakuNode({}, libp2p, store);
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timestampDiv.innerHTML = "<p>Starting waku.</p>";
await node.start();
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timestampDiv.innerHTML = "<p>Connecting to a peer.</p>";
await waitForRemotePeer(node, ["store"]);
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timestampDiv.innerHTML = "<p>Retrieving messages.</p>";
const callback = (wakuMessage) => {
// When `backward` direction is passed, first message is the most recent
timestampDiv.innerHTML = wakuMessage.timestamp;
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// When returning true, `queryHistory` stops retrieving pages
// In our case, we only want one message, hence one page.
return true;
};
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await node.store.queryOrderedCallback(
[createDecoder("/relay-ping/1/ping/null")],
callback,
{ pageDirection: "backward" }
);
</script>
</body>
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</html>