feat: add light push + filter JavaScript example
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fryorcraken.eth
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@ -40,6 +40,7 @@ pipeline {
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parallel {
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stage('relay-js') { steps { script { copyExample() } } }
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stage('store-js') { steps { script { copyExample() } } }
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stage('light-js') { steps { script { copyExample() } } }
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}
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}
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@ -0,0 +1,13 @@
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# Using Waku Light Push and Filter in JavaScript
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**Demonstrates**:
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- Waku Light node: Waku Filter + Waku Light Push
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- Pure Javascript/HTML.
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- Use minified bundle of js from unpkg.com, no import, no package manager.
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This example uses Waku Filter to listen to messages and Waku Light Push to send messages.
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To test the example, simply download the `index.html` file from this folder and open it in a browser.
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The `master` branch's HEAD is deployed at https://js.waku.org/light-js/.
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@ -0,0 +1,126 @@
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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 light node example</title>
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</head>
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<body>
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<div><h2>Status</h2></div>
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<div id='status'></div>
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<div><h2>Local Peer Id</h2></div>
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<div id='peer-id'></div>
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<div><h2>Remote Peer Id</h2></div>
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<div id='remote-peer-id'></div>
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<input id='remote-multiaddr'
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type='text'
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value="/dns4/node-01.ac-cn-hongkong-c.wakuv2.test.statusim.net/tcp/443/wss/p2p/16Uiu2HAkvWiyFsgRhuJEb9JfjYxEkoHLgnUQmr1N5mKWnYjxYRVm">
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<button id='dial' type='button'>Dial</button>
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<br/>
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<button id='subscribe' type='button'>Subscribe</button>
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<button id='unsubscribe' type='button'>Unsubscribe</button>
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<br/>
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<input id='textInput' placeholder='Type your message here' type='text'>
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<button id='sendButton' type='button'>Send Message</button>
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<br/>
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<div id="messages"></div>
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<script type='module'>
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import {
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utils,
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WakuMessage
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} from 'https://unpkg.com/js-waku@next/bundle/index.js';
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import {
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createLightNode
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} from 'https://unpkg.com/js-waku@next/bundle/lib/create_waku.js'
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import {
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waitForRemotePeer
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} from 'https://unpkg.com/js-waku@next/bundle/lib/wait_for_remote_peer.js'
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const peerIdDiv = document.getElementById('peer-id');
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const remotePeerIdDiv = document.getElementById('remote-peer-id');
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const statusDiv = document.getElementById('status');
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const remoteMultiAddrDiv = document.getElementById('remote-multiaddr');
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const dialButton = document.getElementById('dial')
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const subscribeButton = document.getElementById('subscribe')
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const unsubscribeButton = document.getElementById('unsubscribe')
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const messagesDiv = document.getElementById('messages')
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const textInput = document.getElementById('textInput');
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const sendButton = document.getElementById('sendButton');
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const ContentTopic = "/light-js/0/message/utf8";
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let messages = []
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let unsubscribe;
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subscribeButton.disabled = true
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textInput.disabled = true;
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sendButton.disabled = true;
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unsubscribeButton.disabled = true;
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const updateMessages = (msgs, div) => {
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div.innerHTML = "<ul>"
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messages.forEach(msg => div.innerHTML += "<li>" + msg + "</li>")
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div.innerHTML += "</ul>"
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}
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statusDiv.innerHTML = '<p>Creating Waku node.</p>';
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const node = await createLightNode();
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statusDiv.innerHTML = '<p>Starting Waku node.</p>';
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await node.start();
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statusDiv.innerHTML = '<p>Waku node started.</p>';
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peerIdDiv.innerHTML = '<p>' + node.libp2p.peerId.toString() + '</p>'
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dialButton.onclick = async () => {
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const ma = remoteMultiAddrDiv.value
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if (!ma) {
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statusDiv.innerHTML = '<p>Error: No multiaddr provided.</p>';
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return;
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}
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statusDiv.innerHTML = '<p>Dialing peer.</p>';
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await node.dial(ma, ["filter", "lightpush"])
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await waitForRemotePeer(node, ["filter", "lightpush"]);
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const peers = await node.libp2p.peerStore.all();
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statusDiv.innerHTML = '<p>Peer dialed.</p>';
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remotePeerIdDiv.innerHTML = '<p>' + peers[0].id.toString() + '</p>'
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textInput.disabled = false;
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sendButton.disabled = false;
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subscribeButton.disabled = false;
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}
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const callback = (wakuMessage) => {
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const text = utils.bytesToUtf8(wakuMessage.payload)
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const timestamp = wakuMessage.timestamp.toString()
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messages.push(text + " - " + timestamp)
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updateMessages(messages, messagesDiv)
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}
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subscribeButton.onclick = async () => {
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unsubscribe = await node.filter.subscribe(callback, [ContentTopic])
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unsubscribeButton.disabled = false;
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}
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unsubscribeButton.onclick = async () => {
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await unsubscribe();
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unsubscribe = undefined
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unsubscribeButton.disabled = true;
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}
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sendButton.onclick = async () => {
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const text = textInput.value;
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const wakuMessage = await WakuMessage.fromUtf8String(text, ContentTopic);
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await node.lightPush.push(wakuMessage);
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console.log('Message sent!');
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textInput.value = null;
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};
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</script>
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</body>
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</html>
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