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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 >
< / head >
< body >
< div > < h1 > Timestamp of latest message seen in store< / h1 > < / div >
< div id = 'timestamp' > < / div >
< script type = 'module' >
import {
Protocols
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} from 'https://unpkg.com/js-waku@0.27.0/bundle/index.js';
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import {
createWaku
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} from 'https://unpkg.com/js-waku@0.27.0/bundle/lib/create_waku.js'
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import {
waitForRemotePeer
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} from 'https://unpkg.com/js-waku@0.27.0/bundle/lib/wait_for_remote_peer.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');
try {
timestampDiv.innerHTML = '< p > Creating waku.< / p > ';
const node = await createWaku({ defaultBootstrap: true });
timestampDiv.innerHTML = '< p > Starting waku.< / p > ';
await node.start();
timestampDiv.innerHTML = '< p > Connecting to a peer.< / p > ';
await waitForRemotePeer(node, [Protocols.Store]);
timestampDiv.innerHTML = '< p > Retrieving messages.< / p > ';
const callback = (wakuMessages) => {
// Messages are ordered with oldest first
// even with page direction `backward`
const latestFirst = wakuMessages.reverse();
const latestMessage = latestFirst[0];
if (latestMessage) {
timestampDiv.innerHTML = latestMessage.timestamp;
} else {
timestampDiv.innerHTML = '< p > No message available, go to < a href = "https://js-waku.wakuconnect.dev/examples/web-chat/" > web-chat< / a > to send a message< / p > ';
}
// When returning true, `queryHistory` stops retrieving pages
// In our case, we only want one message, hence one page.
return true;
};
const startTime = new Date();
// Only retrieve a week of messages
startTime.setTime(Date.now() - 7 * 24 * 60 * 60 * 1000);
await node.store
.queryHistory([], {
callback,
pageDirection: 'backward',
pageSize: 1,
timeFilter: {
startTime,
endTime: new Date()
}
});
} catch (e) {
timestampDiv.innerHTML = 'Error encountered: ' + e.toString();
}
< / script >
< / body >
< / html >
