lotsa frontend changes

frontend/create.html

@@ -39,12 +39,12 @@
           placeholder="English"
         />
         <button>Create</button>
-      </form>
 
         <p>
           Already have a session?
           <a href="/">Join your session</a> instead.
         </p>
+      </form>
     </div>
 
     <script type="module" src="/create.mjs?v=9"></script>

frontend/index.html

@@ -41,11 +41,11 @@
           required
         />
         <button id="join-session-button">Join</button>
-      </form>
 
         <p>
           No session to join? <a href="/create.html">Create a session</a> instead.
         </p>
+      </form>
     </div>
 
     <div id="video-container"></div>

frontend/lib/chat.mjs

@@ -29,6 +29,7 @@ const setupChatboxEvents = (socket) => {
 	autocompleting = false;
   }
   messageInput.addEventListener("input", autocomplete)
+  messageInput.addEventListener("selectionchange", autocomplete);
 
   chatForm.addEventListener("submit", async (e) => {
     e.preventDefault();

frontend/lib/join-session.mjs

@@ -72,13 +72,18 @@ export const setupJoinSessionForm = () => {
     sessionId.value = window.location.hash.substring(1);
   }
 
-  form.addEventListener("submit", (event) => {
+  form.addEventListener("submit", async (event) => {
     event.preventDefault();
 
     button.disabled = true;
 
     saveNickname(nickname);
     saveColour(colour);
-    joinSession(nickname.value, sessionId.value, colour.value.replace(/^#/, ""));
+    try {
+      await joinSession(nickname.value, sessionId.value, colour.value.replace(/^#/, ""));
+    } catch (e) {
+      alert(e.message)
+	  button.disabled = false;
+    }
   });
 };

frontend/lib/reconnecting-web-socket.mjs

@@ -0,0 +1,59 @@
+export default class ReconnectingWebSocket {
+  constructor(url){
+    if(url instanceof URL) {
+      this.url = url;
+    } else {
+      this.url = new URL(url)
+    }
+    this.connected = false;
+    this._eventTarget = new EventTarget();
+    this._backoff = 250; // milliseconds, doubled before use
+	this._lastConnect = 0;
+    this._socket = null;
+    this._unsent = [];
+    this._connect(true);
+  }
+  _connect(first) {
+    if(this._socket) try { this._socket.close() } catch (e) {};
+    try {
+      this._socket = new WebSocket(this.url.href);
+    } catch (e) {
+      this._reconnecting = false;
+      return this._reconnect()
+    }
+    this._socket.addEventListener("close", () => this._reconnect())
+    this._socket.addEventListener("error", () => this._reconnect())
+    this._socket.addEventListener("message", ({data}) => this._eventTarget.dispatchEvent(new MessageEvent("message", {data})))
+    this._socket.addEventListener("open", e => {
+      if(first) this._eventTarget.dispatchEvent(new Event("open"));
+      if(this._reconnecting) this._eventTarget.dispatchEvent(new Event("reconnected"));
+      this._reconnecting = false;
+      this._backoff = 250;
+      this.connected = true;
+      while(this._unsent.length > 0) this._socket.send(this._unsent.shift())
+    })
+  }
+  _reconnect(){
+    if(this._reconnecting) return;
+    this._eventTarget.dispatchEvent(new Event("reconnecting"));
+    this._reconnecting = true;
+    this.connected = false;
+    this._backoff *= 2; // exponential backoff
+    setTimeout(() => {
+      this._connect();
+    }, Math.floor(this._backoff+(Math.random()*this._backoff*0.25)-(this._backoff*0.125)))
+  }
+  send(message) {
+    if(this.connected) {
+      this._socket.send(message);
+    } else {
+      this._unsent.push(message);
+    }
+  }
+  addEventListener(...a) {
+    return this._eventTarget.addEventListener(...a)
+  }
+  removeEventListener(...a) {
+    return this._eventTarget.removeEventListener(...a)
+  }
+}

frontend/lib/watch-session.mjs

@@ -1,10 +1,11 @@
 import { setupVideo } from "./video.mjs?v=9";
 import { setupChat, logEventToChat, updateViewerList } from "./chat.mjs?v=9";
+import ReconnectingWebSocket from "./reconnecting-web-socket.mjs"
 
 /**
  * @param {string} sessionId
  * @param {string} nickname
- * @returns {WebSocket}
+ * @returns {ReconnectingWebSocket}
  */
 const createWebSocket = (sessionId, nickname, colour) => {
   const wsUrl = new URL(
@@ -13,8 +14,8 @@ const createWebSocket = (sessionId, nickname, colour) => {
       `&colour=${encodeURIComponent(colour)}`,
     window.location.href
   );
-  wsUrl.protocol = { "http:": "ws:", "https:": "wss:" }[wsUrl.protocol];
-  const socket = new WebSocket(wsUrl.toString());
+  wsUrl.protocol = "ws" + window.location.protocol.slice(4);
+  const socket = new ReconnectingWebSocket(wsUrl);
 
   return socket;
 };
@@ -60,7 +61,7 @@ export const setPlaying = async (playing, video = null) => {
 
 /**
  * @param {HTMLVideoElement} video
- * @param {WebSocket} socket
+ * @param {ReconnectingWebSocket} socket
  */
 const setupIncomingEvents = (video, socket) => {
   socket.addEventListener("message", async (messageEvent) => {
@@ -97,7 +98,7 @@ const setupIncomingEvents = (video, socket) => {
 
 /**
  * @param {HTMLVideoElement} video
- * @param {WebSocket} socket
+ * @param {ReconnectingWebSocket} socket
  */
 const setupOutgoingEvents = (video, socket) => {
   const currentVideoTime = () => (video.currentTime * 1000) | 0;
@@ -167,11 +168,33 @@ const setupOutgoingEvents = (video, socket) => {
  * @param {string} sessionId
  */
 export const joinSession = async (nickname, sessionId, colour) => {
-  try {
+  // try { // we are handling errors in the join form.
+  const genericConnectionError = new Error("There was an issue getting the session information.");
   window.location.hash = sessionId;
-
-    const { video_url, subtitle_tracks, current_time_ms, is_playing } =
-      await fetch(`/sess/${sessionId}`).then((r) => r.json());
+  let response, video_url, subtitle_tracks, current_time_ms, is_playing;
+  try {
+    response = await fetch(`/sess/${sessionId}`);
+  } catch (e) {
+    console.error(e);
+    throw genericConnectionError;
+  }
+  if(!response.ok) {
+    let error;
+    try {
+      ({ error } = await response.json());
+      if(!error) throw new Error();
+    } catch (e) {
+      console.error(e);
+      throw genericConnectionError;
+    }
+    throw new Error(error)
+  }
+  try {
+    ({ video_url, subtitle_tracks, current_time_ms, is_playing } = await response.json());
+  } catch (e) {
+    console.error(e);
+    throw genericConnectionError;
+  }
 
   const socket = createWebSocket(sessionId, nickname, colour);
   socket.addEventListener("open", async () => {
@@ -193,11 +216,15 @@ export const joinSession = async (nickname, sessionId, colour) => {
     setupIncomingEvents(video, socket);
     setupChat(socket);
   });
-    // TODO: Close listener ?
-  } catch (err) {
-    // TODO: Show an error on the screen
-    console.error(err);
-  }
+  socket.addEventListener("reconnecting", e => {
+    console.log("Reconnecting...");
+  });
+  socket.addEventListener("reconnected", e => {
+    console.log("Reconnected.");
+  });
+  //} catch (e) {
+  //  alert(e.message)
+  //}
 };
 
 /**

frontend/styles.css

@@ -1,3 +1,7 @@
+* {
+  box-sizing: border-box;
+}
+
 :root {
   --bg-rgb: 28, 23, 36;
   --fg-rgb: 234, 234, 248;
@@ -57,8 +61,6 @@ label {
 
 input[type="url"],
 input[type="text"] {
-  box-sizing: border-box;
-
   background: #fff;
   background-clip: padding-box;
   border: 1px solid rgba(0, 0, 0, 0.12);
@@ -72,8 +74,7 @@ input[type="text"] {
 
   font-family: sans-serif;
   font-size: 1em;
-  width: 500px;
-  max-width: 100%;
+  width: 100%;
 
   resize: none;
   overflow-x: wrap;
@@ -84,7 +85,7 @@ button {
   background-color: var(--accent);
   border: var(--accent);
   border-radius: 6px;
-  color: var(--fg);
+  color: #fff;
   padding: 0.5em 1em;
   display: inline-block;
   font-weight: 400;
@@ -94,13 +95,19 @@ button {
 
   font-family: sans-serif;
   font-size: 1em;
-  width: 500px;
-  max-width: 100%;
+  width: 100%;
 
   user-select: none;
   border: 1px solid rgba(0, 0, 0, 0);
   line-height: 1.5;
   cursor: pointer;
+  margin: 0.5em 0;
+}
+
+button:disabled {
+  filter: saturate(0.75);
+  opacity: 0.75;
+  cursor: default;
 }
 
 button.small-button {
@@ -121,20 +128,25 @@ button.small-button {
 
 #pre-join-controls,
 #create-controls {
-  width: 60%;
-  margin: 0 auto;
-  margin-top: 4em;
+  margin: 0;
+  flex-grow: 1;
+  overflow-y: auto;
+  display: flex;
+  flex-direction: column;
+  align-items: center;
+  justify-content: center;
 }
 
 #join-session-form,
 #create-session-form {
-  margin-bottom: 4em;
+  width: 500px;
+  max-width: 100%;
+  padding: 1rem;
 }
 
 #post-create-message {
   display: none;
-  width: 500px;
-  max-width: 100%;
+  width: 100%;
   font-size: 0.85em;
 }
 
@@ -245,13 +257,35 @@ button.small-button {
   border-radius: 4px;
   width: 100%;
 }
+
 .emoji-option:hover, .emoji-option:focus {
   background: var(--fg-transparent);
 }
+
 .emoji-option:last-child {
   margin: 0;
 }
 
+#join-session-colour {
+  -moz-appearance: none;
+  -webkit-appearance: none;
+  appearance: none;
+  border: none;
+  padding: 0;
+  border-radius: 6px;
+  overflow: hidden;
+  margin: 0.5em 0;
+  height: 2rem;
+  width: 2.5rem;
+  cursor: pointer;
+}
+
+input[type="color"]::-moz-color-swatch, input[type="color"]::-webkit-color-swatch, input[type="color"]::-webkit-color-swatch-wrapper { /* This *should* be working in Chrome, but it doesn't for reasons that are beyond me. */
+  border: none;
+  margin: 0;
+  padding: 0;
+}
+
 @media (min-aspect-ratio: 4/3) {
   body {
     flex-direction: row;