waku-lab/examples/light-js/index.html

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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 light node example</title>
<link rel="apple-touch-icon" href="./favicon.png" />
<link rel="manifest" href="./manifest.json" />
<link rel="icon" href="./favicon.ico" />
</head>
<body>
<div>
<h2>Status</h2>
</div>
<div id="status"></div>
<div>
<h2>Local Peer Id</h2>
</div>
<div id="peer-id"></div>
<div>
<h2>Select Peer</h2>
</div>
<div>
<button id="getPeersButton" type="button">Refresh Peers</button>
<select id="peer-select">
<option value=""></option>
</select>
</div>
<div>
<label for="remote-multiaddr">Remote peer's multiaddr</label>
</div>
<div style="margin-right: 1em">
<input
id="remote-multiaddr"
type="text"
value=""
style="width: 100%; max-width: 900px"
/>
</div>
<button disabled id="dial" type="button">Dial</button>
<div>
<h2>Remote Peers</h2>
</div>
<div id="remote-peer-id"></div>
<br />
<button disabled id="subscribe" type="button">Subscribe with Filter</button>
<button disabled id="unsubscribe" type="button">
Unsubscribe with Filter
</button>
<br />
<label for="textInput">Message text</label>
<input id="textInput" placeholder="Type your message here" type="text" />
<button disabled id="sendButton" type="button">
Send message using Light Push
</button>
<br />
<div id="messages"></div>
<div>
<h2>Store</h2>
</div>
<button disabled id="queryStoreButton" type="button">
Retrieve past messages
</button>
<script src="https://unpkg.com/@multiformats/multiaddr@12.1.1/dist/index.min.js"></script>
<script type="module">
import {
createLightNode,
waitForRemotePeer,
createEncoder,
createDecoder,
utf8ToBytes,
bytesToUtf8,
} from "https://unpkg.com/@waku/sdk@0.0.20/bundle/index.js";
import {
enrTree,
DnsNodeDiscovery,
} from "https://unpkg.com/@waku/dns-discovery@0.0.16/bundle/index.js";
import { messageHash } from "https://unpkg.com/@waku/message-hash@0.1.8/bundle/index.js";
const peerIdDiv = document.getElementById("peer-id");
const remotePeerIdDiv = document.getElementById("remote-peer-id");
const statusDiv = document.getElementById("status");
const remoteMultiAddrDiv = document.getElementById("remote-multiaddr");
const dialButton = document.getElementById("dial");
const subscribeButton = document.getElementById("subscribe");
const unsubscribeButton = document.getElementById("unsubscribe");
const queryStoreButton = document.getElementById("queryStoreButton");
const messagesDiv = document.getElementById("messages");
const textInput = document.getElementById("textInput");
const sendButton = document.getElementById("sendButton");
const getPeersButton = document.getElementById("getPeersButton");
const peersSelector = document.getElementById("peer-select");
const ContentTopic = "/js-waku-examples/1/chat/utf8";
const decoder = createDecoder(ContentTopic);
const encoder = createEncoder({ contentTopic: ContentTopic });
// Each key is a unique identifier for the message. Each value is an obj { text, timestamp }
let messages = {};
let unsubscribe;
const updateMessages = (msgs, div) => {
div.innerHTML = "<ul>";
Object.values(msgs)
.sort((a, b) => a.timestamp.getTime() - b.timestamp.getTime())
.forEach(
(msg) =>
(div.innerHTML +=
"<li>" + `${msg.text} - ${msg.timestamp}` + "</li>")
);
div.innerHTML += "</ul>";
};
try {
await getPeers();
} catch (e) {
console.log("Failed to find a peer", e);
remoteMultiAddrDiv.value =
"/dns4/node-01.ac-cn-hongkong-c.wakuv2.test.statusim.net/tcp/8000/wss/p2p/16Uiu2HAkvWiyFsgRhuJEb9JfjYxEkoHLgnUQmr1N5mKWnYjxYRVm";
}
statusDiv.innerHTML = "<p>Creating Waku node.</p>";
const node = await createLightNode();
statusDiv.innerHTML = "<p>Starting Waku node.</p>";
await node.start();
window.waku = node;
console.info(
"Use window.waku to access the waku node running in the browser directly through the console."
);
// Queries all peers from libp2p peer store and updates list of connected peers
const updatePeersList = async () => {
// Generate <p> element with connection string from each peer
const peers = await node.libp2p.peerStore.all();
const peerIdElements = peers.map((peer) => {
const element = document.createElement("p");
element.textContent = `${peer.addresses[1].multiaddr}/p2p/${peer.id}`;
return element;
});
// Update elements displaying list of peers
remotePeerIdDiv.replaceChildren(...peerIdElements);
};
// Refreshes list of connected peers each time a new one is detected
node.store.addLibp2pEventListener("peer:connect", async (event) => {
const peerId = event.detail;
console.log(`Peer connected with peer id: ${peerId}`);
// Wait half a second after receiving event for peer to show up in peer store
setTimeout(async () => {
updatePeersList();
}, 500);
// Update status
statusDiv.innerHTML = `<p>Peer dialed: ${peerId}</p>`;
// Enable send and subscribe inputs as we are now connected to a peer
textInput.disabled = false;
sendButton.disabled = false;
subscribeButton.disabled = false;
queryStoreButton.disabled = false;
});
statusDiv.innerHTML = "<p>Waku node started.</p>";
peerIdDiv.innerHTML = "<p>" + node.libp2p.peerId.toString() + "</p>";
dialButton.disabled = false;
dialButton.onclick = async () => {
const ma = remoteMultiAddrDiv.value;
if (!ma) {
statusDiv.innerHTML = "<p>Error: No multiaddr provided.</p>";
return;
}
statusDiv.innerHTML = "<p>Dialing peer.</p>";
let multiaddr;
try {
multiaddr = MultiformatsMultiaddr.multiaddr(ma);
} catch (err) {
statusDiv.innerHTML = "<p>Error: invalid multiaddr provided</p>";
throw err;
}
await node.dial(multiaddr, ["filter", "lightpush", "store"]);
};
const messageReceivedCallback = (wakuMessage) => {
// create a unique key for the message
const msgHash =
bytesToUtf8(messageHash(ContentTopic, wakuMessage)) +
wakuMessage.proto.timestamp;
const text = bytesToUtf8(wakuMessage.payload);
// store message by its key
messages[msgHash + wakuMessage.proto.timestamp] = {
text,
timestamp: wakuMessage.timestamp,
};
// call function to refresh display of messages
updateMessages(messages, messagesDiv);
};
subscribeButton.onclick = async () => {
unsubscribe = await node.filter.subscribe(
[decoder],
messageReceivedCallback
);
unsubscribeButton.disabled = false;
subscribeButton.disabled = true;
};
queryStoreButton.onclick = async () => {
await node.store.queryWithOrderedCallback(
[decoder],
messageReceivedCallback
);
};
unsubscribeButton.onclick = async () => {
await unsubscribe();
unsubscribe = undefined;
unsubscribeButton.disabled = true;
subscribeButton.disabled = false;
};
sendButton.onclick = async () => {
const text = textInput.value;
await node.lightPush.send(encoder, {
payload: utf8ToBytes(text),
});
console.log("Message sent!");
textInput.value = null;
};
getPeersButton.onclick = async () => {
await getPeers(statusDiv, remoteMultiAddrDiv);
};
peersSelector.addEventListener("change", function (event) {
remoteMultiAddrDiv.value = event.target.value;
});
async function getPeers() {
// Display status
statusDiv.innerHTML = "<p>Discovering peers</p>";
// Clear all options in select element
peersSelector.innerHTML = "";
// Get peers using DNS discovery
const defaultNodeCount = 5;
const dnsDiscovery = await DnsNodeDiscovery.dnsOverHttp();
const peers = await dnsDiscovery.getPeers([enrTree["TEST"]], {
relay: defaultNodeCount,
store: defaultNodeCount,
filter: defaultNodeCount,
lightPush: defaultNodeCount,
});
// Create an option element for each peer's multiaddr and append to select element
const optionElements = peers.map((peer) => {
const optionElement = document.createElement("option");
optionElement.value = `${peer.multiaddrs[1]}/p2p/${peer.peerId}`;
optionElement.text = `${peer.multiaddrs[1]}/p2p/${peer.peerId}`;
return optionElement;
});
peersSelector.append(...optionElements);
// Set first peer as selected
peersSelector.options[0].selected = true;
remoteMultiAddrDiv.value = peersSelector.options[0].value;
statusDiv.innerHTML = "<p>Peers discovered</p>";
}
</script>
</body>
</html>