2021-10-12 03:13:54 +00:00
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<!DOCTYPE html>
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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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<title>JS-Waku unpkg example</title>
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</head>
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<body>
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<div><h1>Timestamp of latest relay ping</h1></div>
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<div id='timestamp'></div>
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<script
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2021-10-13 00:45:26 +00:00
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src='https://unpkg.com/js-waku@latest/build/umd/js-waku.min.bundle.js'></script>
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2021-10-12 03:13:54 +00:00
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<script>
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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 scripts 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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* More explanations are provided in this guide (TODO).
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*/
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const timestampDiv = document.getElementById('timestamp');
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try {
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timestampDiv.innerHTML = '<p>Starting waku.</p>';
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jswaku.Waku.create({ bootstrap: true }).catch(e => {
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timestampDiv.innerHTML = 'Failed to create Waku: ' + e.toString();
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}
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).then(waku => {
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timestampDiv.innerHTML = '<p>Connecting to a peer.</p>';
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waku.waitForConnectedPeer()
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.catch((e) => {
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timestampDiv.innerHTML = 'Failed to connect to peers' + e.toString();
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})
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.then(() => {
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timestampDiv.innerHTML = '<p>Retrieving messages.</p>';
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const callback = (wakuMessages) => {
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// Messages are ordered with oldest first
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// even with page direction `backward`
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const latestFirst = wakuMessages.reverse();
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const latestMessage = latestFirst[0];
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if (latestMessage) {
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timestampDiv.innerHTML = latestMessage.timestamp;
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} else {
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timestampDiv.innerHTML = '<p>No ping message available</p>';
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}
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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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};
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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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waku.store
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.queryHistory(['/relay-ping/1/ping/null'], {
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callback,
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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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timestampDiv.innerHTML = 'Failed to retrieve messages' + e.toString();
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});
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});
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});
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} catch (e) {
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timestampDiv.innerHTML = 'Failed to start application' + e.toString();
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}
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</script>
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</body>
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</html>
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