From cc73ac0908b73f5e834b734b7ec99ebea7620255 Mon Sep 17 00:00:00 2001
From: Franck Royer <franck@status.im>
Date: Wed, 27 Jul 2022 13:18:32 +1000
Subject: [PATCH] feat(example): migrate relay-js to esm

---
 examples/relay-js/index.html | 160 ++++++++++++++---------------------
 1 file changed, 63 insertions(+), 97 deletions(-)

diff --git a/examples/relay-js/index.html b/examples/relay-js/index.html
index 914adf759a..dec722d157 100644
--- a/examples/relay-js/index.html
+++ b/examples/relay-js/index.html
@@ -13,40 +13,25 @@
 <div id='status'></div>
 
 <input id='textInput' placeholder='Type your message here' type='text'>
-<button id='sendButton' onclick='sendMessage();' type='button'>Send Message
+<button id='sendButton' type='button'>Send Message
 </button>
 
 <div><h1>Messages</h1></div>
 <div id='messages'></div>
 
 
-<script
-  src='https://unpkg.com/js-waku@latest/build/umd/js-waku.min.bundle.js'></script>
-<script>
+<script type='module'>
   /**
    * Demonstrate usage of js-waku in the browser. Use relay, gossip sub protocol to send and receive messages.
    * Recommended payload is protobuf. Using simple utf-8 string for demo purposes only.
-   *
-   * - API documentation: https://js-waku.wakuconnect.dev/
-   * - Guides: https://docs.wakuconnect.dev/
-   *
-   * Note: open this HTML in two different browsers to experience decentralized communication.
-   * A node will not show its own messages, this can be changed by modifying the `Waku.create` call:
-   *
-   * Waku.create({
-   *     bootstrap: {default: true}, libp2p: {
-   *         config: {
-   *             pubsub: {
-   *                 enabled: true,
-   *                 emitSelf: true,
-   *             },
-   *         },
-   *     },
-   * })
-   *
    */
 
-  const { Waku, WakuMessage } = jswaku;
+  import {
+    createWaku,
+    waitForRemotePeer,
+    WakuMessage
+  } from '../../dist/bundle.js';
+
   const statusDiv = document.getElementById('status');
   const messagesDiv = document.getElementById('messages');
   const textInput = document.getElementById('textInput');
@@ -63,10 +48,6 @@
   // for simplicity's sake.
   const contentTopic = '/relay-demo/1/message/utf-8';
 
-  // Function to be used to send the text input over Waku.
-  let sendMessage = () => {
-  };
-
   try {
     statusDiv.innerHTML = '<p>Starting</p>';
 
@@ -75,86 +56,71 @@
     // We are currently working on migrating this method to DNS Discovery.
     //
     // https://js-waku.wakuconnect.dev/classes/waku.Waku.html#create
-    Waku.create({ bootstrap: { default: true } }).catch(e => {
-        statusDiv.innerHTML = 'Error';
-        console.log('Issue starting Waku node', e);
-      }
-    ).then(wakuNode => {
+    const waku = await createWaku({ bootstrap: { default: true } });
+    await waku.start();
 
-      // Had a hook to process all incoming messages on a specified content topic.
+    // Had a hook to process all incoming messages on a specified content topic.
+    //
+    // https://js-waku.wakuconnect.dev/classes/waku_relay.WakuRelay.html#addObserver
+    waku.relay.addObserver((wakuMessage) => {
+
+      // Checks there is a payload on the message.
+      // Waku Message is encoded in protobuf, in proto v3 fields are always optional.
       //
-      // https://js-waku.wakuconnect.dev/classes/waku_relay.WakuRelay.html#addObserver
-      wakuNode.relay.addObserver((wakuMessage) => {
+      // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#payload
+      if (!wakuMessage.payload)
+        return;
 
-        // Checks there is a payload on the message.
-        // Waku Message is encoded in protobuf, in proto v3 fields are always optional.
-        //
-        // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#payload
-        if (!wakuMessage.payload)
-          return;
-
-        // Helper method to decode the payload to utf-8. A production dApp should
-        // use `wakuMessage.payload` (Uint8Array) which enables encoding a data
-        // structure of their choice.
-        //
-        // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#payloadAsUtf8
-        const text = wakuMessage.payloadAsUtf8;
-        messagesDiv.innerHTML = `<p>${text}</p><br />` + messagesDiv.innerHTML;
-      }, [contentTopic]);
-
-      statusDiv.innerHTML = '<p>Connecting to a peer</p>';
-
-      // Best effort method that waits for the Waku node to be connected to remote
-      // waku nodes (peers) and for appropriate handshakes to be done.
+      // Helper method to decode the payload to utf-8. A production dApp should
+      // use `wakuMessage.payload` (Uint8Array) which enables encoding a data
+      // structure of their choice.
       //
-      // https://js-waku.wakuconnect.dev/classes/waku.Waku.html#waitForRemotePeer
-      wakuNode.waitForRemotePeer()
-        .catch((e) => {
-          statusDiv.innerHTML = 'Failed to connect to peers: ' + e.toString();
-        })
-        .then(() => {
+      // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#payloadAsUtf8
+      const text = wakuMessage.payloadAsUtf8;
+      messagesDiv.innerHTML = `<p>${text}</p><br />` + messagesDiv.innerHTML;
+    }, [contentTopic]);
 
-          // We are now connected to a remote peer, let's define the `sendMessage`
-          // function that sends the text input over Waku Relay, the gossipsub
-          // protocol.
-          sendMessage = () => {
-            const text = textInput.value;
-            // Reset the text input.
-            textInput.value = null;
+    statusDiv.innerHTML = '<p>Connecting to a peer</p>';
 
-            // Helper functions are available to create a Waku Message.
-            // These functions also provide native symmetric, asymmetric encryption,
-            // signing and signature verification. Check the `Options` object for details:
-            // https://js-waku.wakuconnect.dev/interfaces/waku_message.Options.html
-            //
-            // `WakuMessage.fromBytes` should be preferred for a production dApp to
-            // serialize a data structure.
-            //
-            // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#fromUtf8String
-            WakuMessage.fromUtf8String(text, contentTopic).catch(e => console.log('Error encoding message', e)).then(
-              wakuMessage => {
-                // Once the message is constructed, send it over Waku Relay.
-                //
-                // https://js-waku.wakuconnect.dev/classes/waku_relay.WakuRelay.html#send
-                wakuNode.relay.send(wakuMessage).catch((e) => {
-                  console.log('Error sending message', e);
-                }).then(() => {
-                  console.log('Message sent', text);
-                });
-              }
-            );
+    // Best effort method that waits for the Waku node to be connected to remote
+    // waku nodes (peers) and for appropriate handshakes to be done.
+    //
+    // https://js-waku.wakuconnect.dev/classes/waku.Waku.html#waitForRemotePeer
+    await waitForRemotePeer(waku);
 
-          };
+    // We are now connected to a remote peer, let's define the `sendMessage`
+    // function that sends the text input over Waku Relay, the gossipsub
+    // protocol.
+    sendButton.onclick = async () => {
+      const text = textInput.value;
 
-          // Ready to send & receive messages, enable text input.
-          textInput.disabled = false;
-          sendButton.disabled = false;
-          statusDiv.innerHTML = '<p>Ready!</p>';
+      // Helper functions are available to create a Waku Message.
+      // These functions also provide native symmetric, asymmetric encryption,
+      // signing and signature verification. Check the `Options` object for details:
+      // https://js-waku.wakuconnect.dev/interfaces/waku_message.Options.html
+      //
+      // `WakuMessage.fromBytes` should be preferred for a production dApp to
+      // serialize a data structure.
+      //
+      // https://js-waku.wakuconnect.dev/classes/waku_message.WakuMessage.html#fromUtf8String
+      const wakuMessage = await WakuMessage.fromUtf8String(text, contentTopic);
+      // Once the message is constructed, send it over Waku Relay.
+      //
+      // https://js-waku.wakuconnect.dev/classes/waku_relay.WakuRelay.html#send
+      await waku.relay.send(wakuMessage);
+      console.log('Message sent!');
+
+      // Reset the text input.
+      textInput.value = null;
+    };
+
+    // Ready to send & receive messages, enable text input.
+    textInput.disabled = false;
+    sendButton.disabled = false;
+    statusDiv.innerHTML = '<p>Ready!</p>';
 
-        });
-    });
   } catch (e) {
-    timestampDiv.innerHTML = 'Failed to start application';
+    statusDiv.innerHTML = 'Failed to start application';
     console.log(e);
   }
 </script>