Merge branch '1-queue' into 'develop'

Resolve "Implement queue"

Closes #1

See merge request ekzyis/musicube!6

src/bot.py

@@ -1,40 +1,91 @@
 import os
 import sys
+import asyncio
 
-from discord.ext import commands
+import discord
+from discord.ext import commands, tasks
 from dotenv import load_dotenv
+import youtube_dl
 
-from yt import YTDLSource
 from error import ErrorHandler
 
 load_dotenv()
 
+# Suppress noise about console usage from errors
+youtube_dl.utils.bug_reports_message = lambda: ''
+
 
 class Music(commands.Cog):
   def __init__(self, bot):
-    self.bot = bot
+    self._bot = bot
+    self._queue = asyncio.Queue()
+    self._queue_lock = asyncio.Lock()
+    self._ytdl_format_options = {
+        'format': 'bestaudio/best',
+        'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
+        'restrictfilenames': True,
+        'noplaylist': True,
+        'nocheckcertificate': True,
+        'ignoreerrors': False,
+        'logtostderr': False,
+        'quiet': True,
+        'no_warnings': True,
+        'default_search': 'auto',
+        'source_address': '0.0.0.0'  # bind to ipv4 since ipv6 addresses cause issues sometimes
+    }
+    self._ffmpeg_options = {
+        'options': '-vn'
+    }
+    self._ytdl = youtube_dl.YoutubeDL(self._ytdl_format_options)
+    # pylint: disable=no-member
+    self._handle_playback.start()
+
+  def cog_unload(self):
+    # pylint: disable=no-member
+    self._handle_playback.cancel()
+
+  @tasks.loop()
+  async def _handle_playback(self):
+    while True:
+      await self._queue_lock.acquire()
+      ctx, url, title = await self._queue.get()
+      audio = discord.FFmpegPCMAudio(url, **self._ffmpeg_options)
+
+      def after(err):
+        if err:
+          print(f"Player error: {err}")
+        self._queue.task_done()
+        self._queue_lock.release()
+      ctx.voice_client.play(audio, after=after)
+      await ctx.send(f"Now playing: {title}")
+
+  @_handle_playback.before_loop
+  async def before_handle_playback(self):
+    await self._bot.wait_until_ready()
 
   @commands.command()
-  async def stream(self, ctx, *, url):
+  async def play(self, ctx, *, query):
     async with ctx.typing():
-      player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
+      data = self._ytdl.extract_info(query, download=False)
-      ctx.voice_client.play(player, after=lambda e: print(f"Player error: {e}") if e else None)
+      if 'entries' in data:
-
+        data = data['entries'][0]
-    await ctx.send(f"Now playing: {player.title}")
+        title = data.get('title')
+        url = data.get('url')
+        await self._queue.put((ctx, url, title))
+        if ctx.voice_client.is_playing():
+          await ctx.send(f"Queued: {title}")
 
   @commands.command()
   async def stop(self, ctx):
     await ctx.voice_client.disconnect()
 
-  @stream.before_invoke
+  @play.before_invoke
   async def ensure_voice(self, ctx):
     if ctx.voice_client is None:
       if ctx.author.voice:
         await ctx.author.voice.channel.connect()
       else:
         raise commands.CommandError("Author not connected to a voice channel.")
-    elif ctx.voice_client.is_playing():
-      ctx.voice_client.stop()
 
 
 if __name__ == "__main__":

src/error.py

@@ -15,6 +15,8 @@ class ErrorHandler(commands.Cog):
       message = "You are missing the required permissions to run this command!"
     elif isinstance(error, commands.UserInputError):
       message = "Something about your input was wrong, please check your input and try again!"
+    elif isinstance(error, commands.CommandError):
+      message = str(error)
     else:
       message = "Oh no! Something went wrong while running the command!"
 

src/yt.py

@@ -1,50 +0,0 @@
-import asyncio
-
-import discord
-import youtube_dl
-
-# Suppress noise about console usage from errors
-youtube_dl.utils.bug_reports_message = lambda: ''
-
-
-ytdl_format_options = {
-    'format': 'bestaudio/best',
-    'outtmpl': '%(extractor)s-%(id)s-%(title)s.%(ext)s',
-    'restrictfilenames': True,
-    'noplaylist': True,
-    'nocheckcertificate': True,
-    'ignoreerrors': False,
-    'logtostderr': False,
-    'quiet': True,
-    'no_warnings': True,
-    'default_search': 'auto',
-    'source_address': '0.0.0.0'  # bind to ipv4 since ipv6 addresses cause issues sometimes
-}
-
-ffmpeg_options = {
-    'options': '-vn'
-}
-
-ytdl = youtube_dl.YoutubeDL(ytdl_format_options)
-
-
-class YTDLSource(discord.PCMVolumeTransformer):
-  def __init__(self, source, *, data, volume=0.5):
-    super().__init__(source, volume)
-
-    self.data = data
-
-    self.title = data.get('title')
-    self.url = data.get('url')
-
-  @classmethod
-  async def from_url(cls, url, *, loop=None, stream=False):
-    loop = loop or asyncio.get_event_loop()
-    data = await loop.run_in_executor(None, lambda: ytdl.extract_info(url, download=not stream))
-
-    if 'entries' in data:
-      # take first item from a playlist
-      data = data['entries'][0]
-
-    filename = data['url'] if stream else ytdl.prepare_filename(data)
-    return cls(discord.FFmpegPCMAudio(filename, **ffmpeg_options), data=data)

test/conftest.py

@@ -1,3 +1,4 @@
+import asyncio
 import sys
 from pathlib import Path
 from unittest.mock import Mock
@@ -9,6 +10,8 @@ from pytest_mock import MockerFixture
 SRC_PATH = str(Path(__file__).parent / '..' / 'src')
 sys.path.insert(0, SRC_PATH)
 
+from bot import Music
+
 
 @pytest.fixture
 def bot(mocker: MockerFixture):
@@ -17,6 +20,21 @@ def bot(mocker: MockerFixture):
   yield bot_mock
 
 
+@pytest.fixture
+def mbot(bot):
+  mbot_mock = Music(bot)
+  yield mbot_mock
+  mbot_mock.cog_unload()
+
+
 @pytest.fixture
 def ctx(mocker: MockerFixture):
   yield mocker.patch('discord.ext.commands.Context', autospec=True)
+
+
+@pytest.fixture
+def event_loop():
+  loop = asyncio.get_event_loop()
+  yield loop
+  pending = asyncio.all_tasks(loop=loop)
+  asyncio.ensure_future(asyncio.gather(*pending))

test/test_bot.py

@@ -1,54 +1,98 @@
+import asyncio
 from unittest.mock import Mock, AsyncMock, patch
 
 import pytest
 from discord.ext import commands
 
-from bot import Music
-
 
 @pytest.mark.asyncio
-async def test_bot_ensure_voice(bot, ctx):
+async def test_bot_ensure_voice(mbot, ctx):
-  mbot = Music(bot)
+  # Connects to voice channel of author if possible
-
-  # 1. Inside a voice channel
-  # 1.1 Does not call stop if no sound is playing
-  ctx.voice_client.is_playing.return_value = False
-  await mbot.ensure_voice(ctx)
-  assert ctx.voice_client.stop.call_count == 0
-  ctx.reset_mock(return_value=True)
-
-  # 1.2 Does call stop if sound is playing
-  ctx.voice_client.is_playing.return_value = True
-  await mbot.ensure_voice(ctx)
-  assert ctx.voice_client.stop.call_count == 1
-  ctx.reset_mock(return_value=True)
-
-  # 2. Not inside a voice channel
-  # 2.1 Connects to voice channel of author if possible
   ctx.voice_client = None
   ctx.author.voice = AsyncMock()
   await mbot.ensure_voice(ctx)
-  assert ctx.author.voice.channel.connect.call_count == 1
+  assert ctx.author.voice.channel.connect.call_count == 1, "Did not connect to voice channel of author"
   ctx.reset_mock(return_value=True)
 
-  # 2.2 Error if author not inside a channel
+  # Error if author not inside a channel
   ctx.voice_client = None
   ctx.author.voice = None
   with pytest.raises(commands.CommandError):
     await mbot.ensure_voice(ctx)
 
 
-@pytest.mark.asyncio
+def mock_ytdl_extract_info(ytdl, url, title):
-async def test_bot_stream(bot, ctx):
+  ytdl.extract_info.return_value = {"entries": [{"url": url, "title": title}]}
-  mbot = Music(bot)
 
-  with patch('bot.YTDLSource', new_callable=AsyncMock) as ytdl_source:
+
-    player = Mock()
+def mock_ffmpeg_pcm_audio(ffmpeg_pcm_audio):
-    ytdl_source.from_url.return_value = player
+  deliver_us_audio = Mock()
-    url = 'A Day To Remember - All I Want'
+  ffmpeg_pcm_audio.return_value = deliver_us_audio
-    # pylint: disable=too-many-function-args
+  return deliver_us_audio
-    await mbot.stream(mbot, ctx, url=url)
+
-    assert ytdl_source.from_url.await_args.args == (url,)
+
-    assert ytdl_source.from_url.await_args.kwargs == {"loop": bot.loop, "stream": True}
+@pytest.mark.asyncio
-    assert ctx.voice_client.play.call_args.args == (player,)
+async def test_bot_playback(mbot, ctx):
-    assert ctx.send.call_count == 1
+  with patch.object(mbot, '_ytdl') as ytdl:
+    with patch('discord.FFmpegPCMAudio') as ffmpeg_pcm_audio:
+      ctx.voice_client.is_playing.return_value = False
+      url = "https://www.youtube.com/watch?v=Wr9LZ1hAFpQ"
+      title = "In Flames - Deliver Us (Official Video)"
+      mock_ytdl_extract_info(ytdl, url, title)
+      deliver_us_audio = mock_ffmpeg_pcm_audio(ffmpeg_pcm_audio)
+      query = 'in flames deliver us'
+      # pylint: disable=too-many-function-args
+      await mbot.play(mbot, ctx, query=query)
+      assert \
+          ytdl.extract_info.call_args.args == (query,) and ytdl.extract_info.call_args.kwargs == {"download": False}, \
+          f"ytdl.extract_info was not called with {query}, {{ download: False }}"
+      assert \
+          ffmpeg_pcm_audio.call_args is None, \
+          f"FFmpegPCMAudio was immediately called with {url} instead of being queued"
+      assert \
+          ctx.voice_client.play.call_args is None, \
+          "Did immediately playback audio instead of being queued"
+      assert \
+          ctx.send.call_args is None, \
+          "Did immediately send 'Now playing:' message of being queued"
+      await asyncio.sleep(0)
+      assert \
+          ffmpeg_pcm_audio.call_args.args == (url,), \
+          f"FFmpegPCMAudio was not called with {url}"
+      assert \
+          ctx.voice_client.play.call_args.args == (deliver_us_audio,), \
+          "Did not playback correct audio"
+      assert \
+          ctx.send.call_args.args == (f"Now playing: {title}",), \
+          "Did not send 'Now playing:' message"
+
+      ctx.voice_client.is_playing.return_value = True
+      url = "https://www.youtube.com/watch?v=pMDcYX2wRSg"
+      title = "Three Days Grace - Time of Dying (lyrics)"
+      mock_ytdl_extract_info(ytdl, url, title)
+      time_of_dying_audio = mock_ffmpeg_pcm_audio(ffmpeg_pcm_audio)
+      # pylint: disable=too-many-function-args
+      query = "three days grace time of dying"
+      await mbot.play(mbot, ctx, query=query)
+      assert \
+          ytdl.extract_info.call_args.args == (query,) and ytdl.extract_info.call_args.kwargs == {"download": False}, \
+          f"ytdl.extract_info was not called with {query}, {{ download: False }}"
+      assert \
+          not ffmpeg_pcm_audio.call_args.args == (url,), \
+          f"FFmpegPCMAudio was immediately called with {url} instead of being queued"
+      assert \
+          not ctx.voice_client.play.call_args.args == (time_of_dying_audio,), \
+          "Did immediately playback audio instead of being queued"
+      assert \
+          ctx.send.call_args.args == (f"Queued: {title}",), \
+          "Did not send 'Queued:' message"
+      await asyncio.sleep(0)
+      # Still no playback because previous song not finished
+      assert \
+          not ffmpeg_pcm_audio.call_args.args == (url,), \
+          f"FFmpegPCMAudio was called with {url} before previous song finished"
+      ctx.voice_client.play.call_args.kwargs["after"](None)  # Execute callback for song finish event
+      await asyncio.sleep(0)
+      assert \
+          ffmpeg_pcm_audio.call_args.args == (url,), \
+          f"FFmpegPCMAudio was not called with {url}"