fourth commit

README.md

@@ -3,7 +3,7 @@ A music streaming application.
 
 ## Requirements  
 Python 3.8+  
-Python packages: `gunicorn aiohttp aiohttp_jinja2 uvloop mutagen`  
+Python packages: `gunicorn aiohttp aiohttp_jinja2 uvloop mutagen asyncpg`  
 
 ## Install  
 ```

events.py

@@ -0,0 +1,22 @@
+#!/usr/bin/env python3
+"""
+WebSocket events.
+"""
+import types
+
+async def select(request, ws, data):
+	"""Retrieve information about an artist, album or track."""
+	if data.get('type') == 'artist':
+		async with request.app['pool'].acquire() as conn:
+			albums = await conn.fetch(
+				"SELECT DISTINCT album, date FROM track "
+				"WHERE albumartist = $1 ORDER BY date ASC",
+				data.get('artist', ''))
+		albums = [record['album'] for record in albums]
+		ret = {'event': 'albums', 'ok': True, 'data': albums}
+		await ws.send_json(ret)
+
+events = {}
+for obj in dir():
+	if type(locals()[obj]) == types.FunctionType:
+		events[locals()[obj].__name__] = locals()[obj]

scorch.py

@@ -2,6 +2,7 @@
 """
 A music streaming application.
 """
+import json
 import asyncio
 
 import aiohttp
@@ -13,6 +14,7 @@ import uvloop
 import asyncpg
 
 import config
+import events
 import database
 import buckler_aiohttp
 
@@ -23,9 +25,10 @@ routes = web.RouteTableDef()
 async def index(request):
 	"""The index page."""
 	async with request.app['pool'].acquire() as conn:
-		artists = await conn.execute(
+		artists = await conn.fetch(
 			"SELECT DISTINCT albumartist FROM track ORDER BY albumartist ASC")
-	return render_template('index.html', request, {})
+	artists = [record['albumartist'] for record in artists]
+	return render_template('index.html', request, locals())
 
 
 @routes.get('/ws', name='ws')
@@ -41,10 +44,15 @@ async def websocket_handler(request):
 		if msg.type != WSMsgType.TEXT:
 			break
 
-		if msg.data == "ping":
-			print('ping')
-			await ws.send_str("pong")
+		try:
+			data = json.loads(msg.data)
+		except json.JSONDecodeError:
+			break
 
+		event = data.get('event')
+		if not event or event not in events.events.keys():
+			break
+		await events.events[event](request, ws, data.get('data'))
 	await ws.close()
 	return ws
 

static/scorch.css

@@ -0,0 +1,46 @@
+body {
+	height: 100vh;
+	margin: 0;
+	padding: 8px;
+	box-sizing: border-box;
+}
+
+main {
+	height: 100%;
+	display: grid;
+	grid-template-columns: repeat(3, 1fr);
+	grid-template-rows: auto 1fr auto;
+	grid-template-areas:
+		"h h h"
+		"a b c"
+		"f f f";
+}
+
+#header {
+	grid-area: h;
+}
+
+.list {
+	height: 100%;
+	width: 100%;
+}
+
+#artistListContainer {
+	grid-area: a;
+}
+
+#albumListContainer {
+	grid-area: b;
+}
+
+#trackListContainer {
+	grid-area: c;
+}
+
+#playerContainer {
+	grid-area: f;
+	height: auto;
+	max-height: 30vh;
+	display: flex;
+	justify-content: center;
+}

static/scorch.js

@@ -12,31 +12,90 @@ function init_websocket() {
 	socket.onclose = onclose;
 	socket.onerror = onerror;
 	socket.events = {};
+	socket.events['albums'] = albums_recv;
 	return socket;
 }
 
 function send_event(event_title, data) {
 	data = JSON.stringify({'event': event_title, 'data': data});
-	if (socket.readyState == 0) {
+	if (this.readyState == 0) {
 		console.log("Socket is still opening!");
 		return;
 	}
-	socket.send(data);
+	this.send(data);
 }
 
-function onmessage(e) {
-	console.log(e);
+function onmessage(event) {
+	let data;
+	let event_title;
+	try {
+		data = JSON.parse(event.data);
+	} catch(err) {
+		// not JSON
+		console.log(err);
+		console.log(event);
+		throw new Error("Error decoding JSON");
+		return;
+	}
+
+	if (!data.ok) {
+		throw new Error("Socket error: event = " + event_title + ", error = " + data.error);
+	}
+
+	try {
+		event_title = data.event;
+		data = data.data;
+	} catch(err) {
+		// not proper event
+		console.log(err);
+		console.log(event);
+		throw new Error("Event malformed");
+		return;
+	}
+
+	if (socket.events[event_title] === undefined) {
+		console.log("Unknown socket event: " + event_title);
+		return;
+	}
+	socket.events[event_title](data);
 }
 
-function onclose(e) {
-	if (e.wasClean) { return; } // no need to reconnect
-	console.log(e);
+async function onclose(event) {
+	if (event.wasClean) { return; } // no need to reconnect
+	console.log(event);
 	console.log('Websocket lost connection to server. Re-trying...');
-	//socket = init_websocket();
-	//await sleep(5000);
+	await sleep(3000);
+	socket = init_websocket();
 }
 
-function onerror(e) {
-	console.log("Websocket error!")
-	console.log(e);
+function sleep(ms) {
+	return new Promise(resolve => setTimeout(resolve, ms));
 }
+
+function onerror(event) {
+	console.log("Websocket error!")
+	console.log(event);
+}
+
+/* Websocket receive */
+function albums_recv(data) {
+	let albums_list = document.querySelector('#albumList');
+	while (albums_list.firstChild) {
+		albums_list.removeChild(albums_list.lastChild);
+	}
+	for (let album of data) {
+		let option = document.createElement('option');
+		option.value = album;
+		option.innerText = album;
+		albums_list.appendChild(option);
+	}
+}
+
+/* Websocket send */
+function select_artist(option) {
+	let artist = option.value;
+	let data = {'type': 'artist', 'artist': artist};
+	socket.send_event('select', data);
+}
+
+/* DOM */

templates/index.html

@@ -7,15 +7,42 @@
 		<script type="text/javascript" src="/static/scorch.js"></script>
 		<script>window.onload = load;</script>
 		<meta name="viewport" content="width=device-width, initial-scale=0.8">
-		<meta name="description" content="A music streaming service.">
+		<meta name="description" content="A music streaming platform.">
 	</head>
 	<body>
-		<header>
-			<h1>Scorch</h1>
-		</header>
 		<main>
-			<button onclick="socket.send('test')">Test</button>
-			<audio controls></audio>
+			<div id="header">
+				<h1>Scorch</h1>
+			</div>
+			<div id="artistListContainer" class="list">
+				<select id="artistList" size="2" class="list" onchange="select_artist(this)">
+					{% for artist in artists %}
+					<option value="{{ artist }}">{{ artist }}</option>
+					{% endfor %}
+				</select>
+			</div>
+			<div id="albumListContainer" class="list">
+				<select id="albumList" size="2" class="list" onchange="select_album(this)">
+				</select>
+			</div>
+			<div id="trackListContainer" class="list">
+				<select id="trackList" size="2" class="list" onchange="select_track(this)">
+				</select>
+			</div>
+			<div id="playerContainer">
+				<span id="albumCover"><img src=""></span>
+				<span id="playerControls">
+					<h4><span id="nowPlayingArtist"></span> - <span id="nowPlayingAlbum"></span></h4>
+					<h3 id="nowPlayingTitle"></h3>
+					<audio id="player" controls>
+						<source id="stream" src="" type="audio/ogg">
+					</audio>
+					<div>
+						<input type="checkbox" name="shuffle" id="shuffle" checked="true">
+						<label for="shuffle">Shuffle</label>
+					</div>
+				</span>
+			</div>
 		</main>
 	</body>
 </html>