Add error reporting on connect and main page

components/app.js

@@ -98,6 +98,7 @@ export default class App extends Component {
 		status: Status.DISCONNECTED,
 		buffers: new Map(),
 		activeBuffer: null,
+		error: null,
 	};
 	pendingHistory = Promise.resolve(null);
 	endOfHistory = new Map();
@@ -115,6 +116,7 @@ export default class App extends Component {
 		this.handleJoinClick = this.handleJoinClick.bind(this);
 		this.autocomplete = this.autocomplete.bind(this);
 		this.handleBufferScrollTop = this.handleBufferScrollTop.bind(this);
+		this.dismissError = this.dismissError.bind(this);
 
 		this.saveReceipts = debounce(this.saveReceipts.bind(this), 500);
 
@@ -157,6 +159,11 @@ export default class App extends Component {
 		}
 	}
 
+	dismissError(event) {
+		event.preventDefault();
+		this.setState({ error: null });
+	}
+
 	setBufferState(name, updater, callback) {
 		this.setState((state) => {
 			var buf = state.buffers.get(name);
@@ -353,6 +360,12 @@ export default class App extends Component {
 			this.handleMessage(event.detail.message);
 		});
 
+		this.client.addEventListener("error", (event) => {
+			this.setState({
+				error: event.detail,
+			});
+		});
+
 		this.createBuffer(SERVER_BUFFER);
 		this.switchBuffer(SERVER_BUFFER);
 	}
@@ -461,7 +474,7 @@ export default class App extends Component {
 				var after = receipt;
 				var before = { time: msg.tags.time || irc.formatDate(new Date()) };
 				this.fetchHistoryBetween(channel, after, before, CHATHISTORY_MAX_SIZE).catch((err) => {
-					console.error("Failed to fetch history:", err);
+					this.setState({ error: "Failed to fetch history: " + err });
 					this.receipts.delete(channel);
 					this.saveReceipts();
 				});
@@ -605,20 +618,20 @@ export default class App extends Component {
 
 		var cmd = commands[name];
 		if (!cmd) {
-			console.error("Unknwon command '" + name + "'");
+			this.setState({ error: "Unknown command '" + name + "'" });
 			return;
 		}
 
 		try {
 			cmd(this, args);
-		} catch (err) {
-			console.error(err);
+		} catch (error) {
+			this.setState({ error });
 		}
 	}
 
 	privmsg(target, text) {
 		if (target == SERVER_BUFFER) {
-			console.error("Cannot send message in server buffer");
+			this.setState({ error: "Cannot send message in server buffer" });
 			return;
 		}
 
@@ -787,7 +800,7 @@ export default class App extends Component {
 		if (this.state.status != Status.REGISTERED) {
 			return html`
 				<section id="connect">
-					<${Connect} params=${this.state.connectParams} disabled=${this.state.status != Status.DISCONNECTED} onSubmit=${this.handleConnectSubmit}/>
+					<${Connect} error=${this.state.error} params=${this.state.connectParams} disabled=${this.state.status != Status.DISCONNECTED} onSubmit=${this.handleConnectSubmit}/>
 				</section>
 			`;
 		}
@@ -833,6 +846,9 @@ export default class App extends Component {
 			</>
 			${memberList}
 			<${Composer} ref=${this.composer} readOnly=${this.state.activeBuffer == SERVER_BUFFER} onSubmit=${this.handleComposerSubmit} autocomplete=${this.autocomplete}/>
+			${this.state.error ? html`
+				<p id="error-msg">${this.state.error} <a href="#" onClick=${this.dismissError}>×</a></p>
+			` : null}
 		`;
 	}
 }

components/connect.js

@@ -140,7 +140,9 @@ export default class Connect extends Component {
 				</details>
 
 				<br/>
-
+				${this.props.error ? html`
+					<p class="error-text">${this.props.error || ""}</p>
+				` : null}
 				<button disabled=${this.props.disabled}>Connect</button>
 			</form>
 		`;

lib/client.js

@@ -36,11 +36,10 @@ export default class Client extends EventTarget {
 		try {
 			this.ws = new WebSocket(params.url);
 		} catch (err) {
-			console.error("Failed to create connection:", err);
+			this.dispatchEvent(new CustomEvent("error", { detail: "Failed to create connection: " + err }));
 			setTimeout(() => this.dispatchEvent(new CustomEvent("close")), 0);
 			return;
 		}
-
 		this.ws.addEventListener("open", this.handleOpen.bind(this));
 		this.ws.addEventListener("message", this.handleMessage.bind(this));
 
@@ -50,7 +49,7 @@ export default class Client extends EventTarget {
 		});
 
 		this.ws.addEventListener("error", () => {
-			console.error("Connection error");
+			this.dispatchEvent(new CustomEvent("error", { detail: "Connection Error" }));
 		});
 	}
 
@@ -95,7 +94,7 @@ export default class Client extends EventTarget {
 			this.registered = true;
 			break;
 		case irc.ERR_PASSWDMISMATCH:
-			console.error("Password mismatch");
+			this.dispatchEvent(new CustomEvent("error", { detail: "Password mismatch" }));
 			this.close();
 			break;
 		case "CAP":
@@ -121,7 +120,7 @@ export default class Client extends EventTarget {
 		case irc.ERR_SASLTOOLONG:
 		case irc.ERR_SASLABORTED:
 		case irc.ERR_SASLALREADY:
-			console.error("SASL error:", msg);
+			this.dispatchEvent(new CustomEvent("error", { detail: "SASL error: " + msg }));
 			this.close();
 			break;
 		case "PING":
@@ -258,7 +257,7 @@ export default class Client extends EventTarget {
 
 		// For now only PLAIN is supported
 		if (challengeStr != "+") {
-			console.error("Expected an empty challenge, got:", challengeStr);
+			this.dispatchEvent(new CustomEvent("error", { detail: "Expected an empty challenge, got: " + challengeStr }));
 			this.send({ command: "AUTHENTICATE", params: ["*"] });
 			return;
 		}

style.css

@@ -234,3 +234,22 @@ details summary {
 #buffer .nick-16 {
 	color: #ec273e;
 }
+
+#error-msg {
+	color: white;
+	background-color: red;
+	position: fixed;
+	bottom: 2rem;
+	right: 0;
+	padding: 0.5rem;
+	margin: 0.5rem;
+}
+
+#error-msg a {
+	color: white;
+	text-decoration: none;
+}
+
+.error-text {
+	color: red;
+}