musicube/src/bot.py

import os
import sys

from discord.ext import commands
from dotenv import load_dotenv

from yt import YTDLSource
from error import ErrorHandler

load_dotenv()


class Music(commands.Cog):
  def __init__(self, bot):
    self.bot = bot

  @commands.command()
  async def stream(self, ctx, *, url):
    async with ctx.typing():
      player = await YTDLSource.from_url(url, loop=self.bot.loop, stream=True)
      ctx.voice_client.play(player, after=lambda e: print(f"Player error: {e}") if e else None)

    await ctx.send(f"Now playing: {player.title}")

  @commands.command()
  async def stop(self, ctx):
    await ctx.voice_client.disconnect()

  @stream.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__":
  bot = commands.Bot(command_prefix=commands.when_mentioned_or("!"), description='Relatively simple music bot example')

  @bot.event
  async def on_ready():
    print(f"Logged in as {bot.user} ({bot.user.id})")
    print('------')

  bot.add_cog(Music(bot))
  bot.add_cog(ErrorHandler(bot))

  token = os.environ.get("BOT_TOKEN", None)
  if not token:
    print("No token found in BOT_TOKEN")
    sys.exit(1)

  bot.run(token)