2022-06-17 00:48:15 +00:00
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<!DOCTYPE html>
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<html lang='en'>
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<head>
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2022-09-16 02:08:53 +00:00
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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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<title>JS-Waku store script tag example</title>
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2022-06-17 00:48:15 +00:00
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</head>
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<body>
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2022-09-16 02:08:53 +00:00
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<div><h1>Timestamp of the latest message seen in store</h1></div>
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2022-06-17 00:48:15 +00:00
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<div id='timestamp'></div>
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2022-08-31 03:18:24 +00:00
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<script type='module'>
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2022-09-21 01:58:02 +00:00
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import {Protocols} from 'https://unpkg.com/js-waku@0.29.0/bundle/index.js';
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import {createWaku} from 'https://unpkg.com/js-waku@0.29.0/bundle/lib/create_waku.js'
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import {waitForRemotePeer} from 'https://unpkg.com/js-waku@0.29.0/bundle/lib/wait_for_remote_peer.js'
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import {DecoderV0} from 'https://unpkg.com/js-waku@0.29.0/bundle/lib/waku_message/version_0.js'
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2022-08-31 03:18:24 +00:00
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2022-09-16 02:08:53 +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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2022-06-17 00:48:15 +00:00
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2022-08-31 03:18:24 +00:00
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timestampDiv.innerHTML = '<p>Creating waku.</p>';
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2022-09-16 02:08:53 +00:00
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const node = await createWaku({defaultBootstrap: true});
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2022-08-31 03:18:24 +00:00
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2022-06-17 00:48:15 +00:00
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timestampDiv.innerHTML = '<p>Starting waku.</p>';
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2022-08-31 03:18:24 +00:00
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await node.start();
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2022-06-17 00:48:15 +00:00
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2022-08-31 03:18:24 +00:00
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timestampDiv.innerHTML = '<p>Connecting to a peer.</p>';
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await waitForRemotePeer(node, [Protocols.Store]);
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timestampDiv.innerHTML = '<p>Retrieving messages.</p>';
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2022-09-16 02:08:53 +00:00
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const callback = (wakuMessage) => {
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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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2022-06-17 00:48:15 +00:00
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2022-09-16 02:08:53 +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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2022-08-31 03:18:24 +00:00
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};
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2022-06-17 00:48:15 +00:00
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2022-08-31 03:18:24 +00:00
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const startTime = new Date();
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// Only retrieve a week of messages
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startTime.setTime(Date.now() - 7 * 24 * 60 * 60 * 1000);
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2022-09-16 02:08:53 +00:00
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try {
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await node.store
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2022-09-21 01:58:02 +00:00
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.queryOrderedCallback([new DecoderV0("/relay-ping/1/ping/null")],
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callback,
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{
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pageDirection: 'backward',
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pageSize: 1,
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timeFilter: {
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startTime,
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endTime: new Date()
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}
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});
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} catch (e) {
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// Known issue: https://github.com/status-im/nwaku/issues/1157
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console.log(e)
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}
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2022-06-17 00:48:15 +00:00
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</script>
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</body>
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</html>
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