third commit

README.md

@@ -6,6 +6,16 @@ Python 3.8+
 Python packages: `gunicorn aiohttp aiohttp_jinja2 uvloop mutagen`  
 
 ## Install  
+```
+$ psql
+postgres=# CREATE DATABASE "scorch";
+postgres=# CREATE USER "scorch" WITH PASSWORD 'password';
+postgres=# ALTER ROLE "scorch" SET client_encoding TO 'utf8';
+postgres=# ALTER ROLE "scorch" SET default_transaction_isolation TO 'read committed';
+postgres=# ALTER ROLE "scorch" SET timezone TO 'UTC';
+postgres=# GRANT ALL PRIVILEGES ON DATABASE "scorch" TO "scorch";
+postgres=# \q
+```
 1. Get on the floor  
 2. Walk the dinosaur  
 

config.py.template

@@ -6,9 +6,18 @@ eg. https://example.com/scorch.
 `buckler` specifies settings pertaining to the Buckler server.
 """
 url_prefix = '/scorch'
+music_dir = "/home/iou1name/music/Music"
+db = {
+	'database': 'scorch',
+	'user': 'scorch',
+	'password': """password""",
+	'host': 'localhost',
+	'port': 5432,
+}
+
 buckler = {
 	'url': "http://127.0.0.1:5400/buckler",
-	'app_id': 2,
-	'app_key': """lol""",
+	'app_id': 1,
+	'app_key': """password""",
 	'login_url': "/buckler/login",
 }

database.py

@@ -0,0 +1,93 @@
+#!/usr/bin/env python3
+"""
+Database operations for Scorch.
+"""
+import os
+import multiprocessing
+from datetime import datetime, timezone
+
+import asyncpg
+import mutagen
+import mutagen.mp3
+
+import config
+
+MUSIC_EXT = ['flac', 'mp3']
+
+async def build_library(root_dir):
+	"""Walks the music directory and builds a library of tracks."""
+	print("Building library")
+	filepaths = []
+	for dir_name, sub_dirs, files in os.walk(root_dir):
+		for file in files:
+			if not os.path.splitext(file)[1][1:] in MUSIC_EXT:
+				continue
+			filepath = os.path.join(root_dir, dir_name, file)
+			last_modified = datetime.fromtimestamp(
+				os.path.getmtime(filepath), timezone.utc)
+			filepaths.append((filepath, last_modified))
+	db_pool = await asyncpg.create_pool(**config.db)
+	async with db_pool.acquire() as conn:
+		tracks_prev = await conn.fetch("SELECT * FROM track")
+	tracks_prev = {track['filepath']: track for track in tracks_prev}
+
+	global worker
+	def worker(tup):
+		"""Worker for multi-processing tracks."""
+		filepath, last_modified = tup
+		track_prev = tracks_prev.get(filepath)
+		if track_prev:
+			if track_prev['last_modified'] >= last_modified:
+				return tuple(track_prev)
+		data = read_track(filepath)
+		return data
+
+	with multiprocessing.Pool() as pool:
+		mapping = pool.imap(worker, filepaths)
+		tracks = []
+		prev_percent = 0
+		while True:
+			try:
+				tracks.append(mapping.next())
+			except StopIteration:
+				break
+			percent = round(len(tracks) / len(filepaths) * 100, 2)
+			if percent >= prev_percent + 2.5:
+				print(f"{percent}%")
+				prev_percent = percent
+	async with db_pool.acquire() as conn:
+		await conn.execute("DELETE FROM track")
+		await conn.executemany(
+			"INSERT INTO track VALUES ($1, $2, $3, $4, $5, $6, $7, $8, $9, $10, $11)",
+			tracks
+		)
+	print("Done")
+
+
+def read_track(filepath):
+	"""
+	Reads the specified file and extracts relevant information from it.
+	Returns a tuple.
+	"""
+	if filepath.endswith("mp3"):
+		m = mutagen.mp3.EasyMP3(filepath)
+	else:
+		m = mutagen.File(filepath)
+	artist = m.get('artist', [''])[0]
+	if m.get('albumartist'):
+		albumartist = m.get('albumartist', [''])[0]
+	else:
+		albumartist = m.get('artist', [''])[0]
+	date = m.get('date', [''])[0]
+	album = m.get('album', [''])[0]
+	discnumber = m.get('discnumber', [''])[0]
+	tracknumber = m.get('tracknumber', [''])[0]
+	title = m.get('title', [''])[0]
+	genre = m.get('genre', [''])[0]
+	length = m.info.length
+	last_modified = datetime.fromtimestamp(
+		os.path.getmtime(filepath), timezone.utc)
+
+	d = locals()
+	d.pop('m')
+	return tuple(d.values())

scorch.py

@@ -4,34 +4,27 @@ A music streaming application.
 """
 import asyncio
 
+import aiohttp
 from aiohttp import web, WSMsgType
 import jinja2
 import aiohttp_jinja2
 from aiohttp_jinja2 import render_template
 import uvloop
+import asyncpg
 
 import config
+import database
 import buckler_aiohttp
 
 uvloop.install()
 routes = web.RouteTableDef()
 
-with open ('test.opus', 'rb') as file:
-	test_data = file.read()
-
-def chunker(seq, size):
-	return (seq[pos:pos + size] for pos in range(0, len(seq), size))
-
-async def send_files(ws):
-	for n, chunk in enumerate(chunker(test_data, 200*1024)):
-		print(f"sending packet #{n}")
-		await ws.send_bytes(chunk)
-		await asyncio.sleep(5)
-	
-
 @routes.get('/', name='index')
 async def index(request):
 	"""The index page."""
+	async with request.app['pool'].acquire() as conn:
+		artists = await conn.execute(
+			"SELECT DISTINCT albumartist FROM track ORDER BY albumartist ASC")
 	return render_template('index.html', request, {})
 
 
@@ -52,11 +45,6 @@ async def websocket_handler(request):
 			print('ping')
 			await ws.send_str("pong")
 
-		if msg.data == 'test':
-			print('initiating test')
-			asyncio.create_task(send_files(ws))
-
-
 	await ws.close()
 	return ws
 
@@ -71,6 +59,10 @@ async def init_app():
 		undefined=jinja2.StrictUndefined,
 		loader=jinja2.FileSystemLoader('templates'),
 	)
+	app['pool'] = await asyncpg.create_pool(**config.db)
+	async with app['pool'].acquire() as conn:
+		with open('scorch.sql', 'r') as file:
+			await conn.execute(file.read())
 
 	app.router.add_routes(routes)
 
@@ -80,5 +72,8 @@ async def init_app():
 
 
 if __name__ == "__main__":
-	app = init_app()
-	aiohttp.web.run_app(app, host='0.0.0.0', port=5500)
+	import sys
+	if len(sys.argv) > 1:
+		asyncio.run(database.build_library(config.music_dir))
+	#app = asyncio.run(init_app())
+	#aiohttp.web.run_app(app, host='0.0.0.0', port=5500)

scorch.sql

@@ -0,0 +1,13 @@
+CREATE TABLE IF NOT EXISTS track (
+	filepath TEXT PRIMARY KEY,
+	artist TEXT,
+	albumartist TEXT,
+	date TEXT,
+	album TEXT,
+	discnumber TEXT,
+	tracknumber TEXT,
+	title TEXT,
+	genre TEXT,
+	length FLOAT,
+	last_modified TIMESTAMP WITH TIME ZONE
+)

static/scorch.js

@@ -1,27 +1,4 @@
 var socket;
-var audioCtx = new window.AudioContext();
-var source = audioCtx.createBufferSource();
-var total_raw;
-
-function appendBuffer(buffer1, buffer2) {
-	let numberOfChannels = Math.min( buffer1.numberOfChannels, buffer2.numberOfChannels );
-	let tmp = audioCtx.createBuffer( numberOfChannels, (buffer1.length + buffer2.length), buffer1.sampleRate );
-	for (let i=0; i<numberOfChannels; i++) {
-		let channel = tmp.getChannelData(i);
-		channel.set( buffer1.getChannelData(i), 0);
-		channel.set( buffer2.getChannelData(i), buffer1.length);
-	}
-	return tmp;
-}
-
-function appendBuffer2(buffer1, buffer2) {
-	var tmp = new Uint8Array(buffer1.byteLength + buffer2.byteLength);
-	var buff1 = new Uint8Array(buffer1);
-	var buff2 = new Uint8Array(buffer2);
-	tmp.set(buff1, 0);
-	tmp.set(buff2, buffer1.byteLength);
-	return tmp.buffer;
-};
 
 function load() {
 	socket = init_websocket();
@@ -30,7 +7,7 @@ function load() {
 /* Websocket setup */
 function init_websocket() {
 	let socket = new WebSocket('wss://' + window.location.hostname + ws_uri);
-	socket.binaryType = "arraybuffer";
+	socket.send_event = send_event;
 	socket.onmessage = onmessage;
 	socket.onclose = onclose;
 	socket.onerror = onerror;
@@ -38,25 +15,17 @@ function init_websocket() {
 	return socket;
 }
 
+function send_event(event_title, data) {
+	data = JSON.stringify({'event': event_title, 'data': data});
+	if (socket.readyState == 0) {
+		console.log("Socket is still opening!");
+		return;
+	}
+	socket.send(data);
+}
+
 function onmessage(e) {
 	console.log(e);
-	if (e.data.constructor === ArrayBuffer) {
-		console.log(e.data.byteLength);
-		if (source.buffer != null) {
-			total_raw = appendBuffer2(total_raw, e.data);
-		} else {
-			total_raw = e.data;
-		}
-		audioCtx.decodeAudioData(total_raw.slice(0)).then(function(decodedBuffer) {
-			if (source.buffer != null) {
-				source.stop();
-			}
-			source = audioCtx.createBufferSource();
-			source.buffer = decodedBuffer;
-			source.connect(audioCtx.destination);
-			source.start(0, audioCtx.currentTime);
-		});
-	}
 }
 
 function onclose(e) {