2022-09-06 18:31:23 +00:00
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<!DOCTYPE html>
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2022-12-12 04:59:35 +00:00
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<html lang="en">
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<head>
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<meta charset="UTF-8" />
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<meta content="width=device-width, initial-scale=1.0" name="viewport" />
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2022-09-20 00:27:05 +00:00
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<title>JS-Waku store script tag example</title>
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2022-12-12 04:59:35 +00:00
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</head>
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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<body>
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<div><h1>Timestamp of the latest message seen in store</h1></div>
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<div id="timestamp"></div>
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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<script type="module">
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import {
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defaultLibp2p,
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defaultPeerDiscovery,
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} from "https://unpkg.com/@waku/create@0.0.4/bundle/index.js";
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import { waitForRemotePeer } from "https://unpkg.com/@waku/core@0.0.6/bundle/lib/wait_for_remote_peer.js";
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import {
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wakuStore,
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WakuNode,
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} from "https://unpkg.com/@waku/core@0.0.6/bundle/index.js";
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import { DecoderV0 } from "https://unpkg.com/@waku/core@0.0.6/bundle/lib/waku_message/version_0.js";
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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/**
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* This example demonstrates how to use the js-waku minified bundle
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* available on unpkg.com.
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*
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* It is a simple script that uses Waku Store to retrieve ping relay messages
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* and displays the timestamp of the most recent ping relay message.
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*/
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const timestampDiv = document.getElementById("timestamp");
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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timestampDiv.innerHTML = "<p>Creating waku.</p>";
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2022-11-20 01:31:52 +00:00
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2022-12-12 04:59:35 +00:00
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const libp2p = await defaultLibp2p(undefined, {
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peerDiscovery: [defaultPeerDiscovery()],
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});
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const store = wakuStore();
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const node = new WakuNode({}, libp2p, store);
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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timestampDiv.innerHTML = "<p>Starting waku.</p>";
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await node.start();
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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timestampDiv.innerHTML = "<p>Connecting to a peer.</p>";
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await waitForRemotePeer(node, ["store"]);
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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timestampDiv.innerHTML = "<p>Retrieving messages.</p>";
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const callback = (wakuMessage) => {
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2022-09-20 00:27:05 +00:00
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// When `backward` direction is passed, first message is the most recent
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timestampDiv.innerHTML = wakuMessage.timestamp;
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2022-09-06 18:31:23 +00:00
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2022-09-20 00:27:05 +00:00
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// When returning true, `queryHistory` stops retrieving pages
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// In our case, we only want one message, hence one page.
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return true;
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2022-12-12 04:59:35 +00:00
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};
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2022-09-06 18:31:23 +00:00
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2022-12-12 04:59:35 +00:00
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await node.store.queryOrderedCallback(
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[new DecoderV0("/relay-ping/1/ping/null")],
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callback,
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{ pageDirection: "backward" }
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);
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</script>
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</body>
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2022-09-06 18:31:23 +00:00
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</html>
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