A simple music bot written using discord.py rewrite and youtube_dl.

music_bot_example.py

# -*- coding: utf-8 -*-

"""
Copyright (c) 2019 Valentin B.
A simple music bot written in discord.py using youtube-dl.
Though it's a simple example, music bots are complex and require much time and knowledge until they work perfectly.
Use this as an example or a base for your own bot and extend it as you want. If there are any bugs, please let me know.
Requirements:
Python 3.5+
pip install -U discord.py pynacl youtube-dl
You also need FFmpeg in your PATH environment variable or the FFmpeg.exe binary in your bot's directory on Windows.
"""

import asyncio
import functools
import itertools
import math
import random

import discord
import youtube_dl
from async_timeout import timeout
from discord.ext import commands
import httpx
from bs4 import BeautifulSoup

# Silence useless bug reports messages
youtube_dl.utils.bug_reports_message = lambda: ''

token = open("token.txt", "r").read()

class VoiceError(Exception):
    pass


class YTDLError(Exception):
    pass


class YTDLSource(discord.PCMVolumeTransformer):
    YTDL_OPTIONS = {
        'format': 'bestaudio/best',
        'extractaudio': True,
        'audioformat': 'mp3',
        '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': 'ytsearch',
        'source_address': '0.0.0.0',
    }

    FFMPEG_OPTIONS = {
        'before_options': '-reconnect 1 -reconnect_streamed 1 -reconnect_delay_max 5',
        'options': '-vn',
    }

    ytdl = youtube_dl.YoutubeDL(YTDL_OPTIONS)

    def __init__(self, ctx: commands.Context, source: discord.FFmpegPCMAudio, *, data: dict, volume: float = 0.5):
        super().__init__(source, volume)

        self.requester = ctx.author
        self.channel = ctx.channel
        self.data = data

        self.uploader = data.get('uploader')
        self.uploader_url = data.get('uploader_url')
        date = data.get('upload_date')
        self.upload_date = date[6:8] + '.' + date[4:6] + '.' + date[0:4]
        self.title = data.get('title')
        self.thumbnail = data.get('thumbnail')
        self.description = data.get('description')
        self.duration = self.parse_duration(int(data.get('duration')))
        self.tags = data.get('tags')
        self.url = data.get('webpage_url')
        self.views = data.get('view_count')
        self.likes = data.get('like_count')
        self.dislikes = data.get('dislike_count')
        self.stream_url = data.get('url')

    def __str__(self):
        return '**{0.title}** by **{0.uploader}**'.format(self)

    @classmethod
    async def create_source(cls, ctx: commands.Context, search: str, *, loop: asyncio.BaseEventLoop = None):
        loop = loop or asyncio.get_event_loop()

        partial = functools.partial(cls.ytdl.extract_info, search, download=False, process=False)
        data = await loop.run_in_executor(None, partial)

        if data is None:
            raise YTDLError('Couldn\'t find anything that matches `{}`'.format(search))

        if 'entries' not in data:
            process_info = data
        else:
            process_info = None
            for entry in data['entries']:
                if entry:
                    process_info = entry
                    break

            if process_info is None:
                raise YTDLError('Couldn\'t find anything that matches `{}`'.format(search))

        webpage_url = process_info['webpage_url']
        partial = functools.partial(cls.ytdl.extract_info, webpage_url, download=False)
        processed_info = await loop.run_in_executor(None, partial)

        if processed_info is None:
            raise YTDLError('Couldn\'t fetch `{}`'.format(webpage_url))

        if 'entries' not in processed_info:
            info = processed_info
        else:
            info = None
            while info is None:
                try:
                    info = processed_info['entries'].pop(0)
                except IndexError:
                    raise YTDLError('Couldn\'t retrieve any matches for `{}`'.format(webpage_url))
        
        return cls(ctx, discord.FFmpegPCMAudio(info['url'], **cls.FFMPEG_OPTIONS), data=info)

    @classmethod
    async def search_source(cls, ctx: commands.Context, search: str, *, loop: asyncio.BaseEventLoop = None):
        channel = ctx.channel
        loop = loop or asyncio.get_event_loop()

        cls.search_query = '%s%s:%s' % ('ytsearch', 10, ''.join(search))

        partial = functools.partial(cls.ytdl.extract_info, cls.search_query, download=False, process=False)
        info = await loop.run_in_executor(None, partial)

        cls.search = {}
        cls.search["title"] = f'Search results for:\n**{search}**'
        cls.search["type"] = 'rich'
        cls.search["color"] = 7506394
        cls.search["author"] = {'name': f'{ctx.author.name}', 'url': f'{ctx.author.avatar_url}', 'icon_url': f'{ctx.author.avatar_url}'}
        
        lst = []

        for e in info['entries']:
            #lst.append(f'`{info["entries"].index(e) + 1}.` {e.get("title")} **[{YTDLSource.parse_duration(int(e.get("duration")))}]**\n')
            VId = e.get('id')
            VUrl = 'https://www.youtube.com/watch?v=%s' % (VId)
            lst.append(f'`{info["entries"].index(e) + 1}.` [{e.get("title")}]({VUrl})\n')

        lst.append('\n**Type a number to make a choice, Type `cancel` to exit**')
        cls.search["description"] = "\n".join(lst)

        em = discord.Embed.from_dict(cls.search)
        await ctx.send(embed=em, delete_after=45.0)

        def check(msg):
            return msg.content.isdigit() == True and msg.channel == channel or msg.content == 'cancel' or msg.content == 'Cancel'
        
        try:
            m = await bot.wait_for('message', check=check, timeout=45.0)

        except asyncio.TimeoutError:
            rtrn = 'timeout'

        else:
            if m.content.isdigit() == True:
                sel = int(m.content)
                if 0 < sel <= 10:
                    for key, value in info.items():
                        if key == 'entries':
                            """data = value[sel - 1]"""
                            VId = value[sel - 1]['id']
                            VUrl = 'https://www.youtube.com/watch?v=%s' % (VId)
                            partial = functools.partial(cls.ytdl.extract_info, VUrl, download=False)
                            data = await loop.run_in_executor(None, partial)
                    rtrn = cls(ctx, discord.FFmpegPCMAudio(data['url'], **cls.FFMPEG_OPTIONS), data=data)
                else:
                    rtrn = 'sel_invalid'
            elif m.content == 'cancel':
                rtrn = 'cancel'
            else:
                rtrn = 'sel_invalid'
        
        return rtrn

    @staticmethod
    def parse_duration(duration: int):
        if duration > 0:
            minutes, seconds = divmod(duration, 60)
            hours, minutes = divmod(minutes, 60)
            days, hours = divmod(hours, 24)

            duration = []
            if days > 0:
                duration.append('{}'.format(days))
            if hours > 0:
                duration.append('{}'.format(hours))
            if minutes > 0:
                duration.append('{}'.format(minutes))
            if seconds > 0:
                duration.append('{}'.format(seconds))
            
            value = ':'.join(duration)
        
        elif duration == 0:
            value = "LIVE"
        
        return value


class Song:
    __slots__ = ('source', 'requester')

    def __init__(self, source: YTDLSource):
        self.source = source
        self.requester = source.requester
    
    def create_embed(self):
        embed = (discord.Embed(title='Now playing', description='```css\n{0.source.title}\n```'.format(self), color=discord.Color.blurple())
                .add_field(name='Duration', value=self.source.duration)
                .add_field(name='Requested by', value=self.requester.mention)
                .add_field(name='Uploader', value='[{0.source.uploader}]({0.source.uploader_url})'.format(self))
                .add_field(name='URL', value='[Click]({0.source.url})'.format(self))
                .set_thumbnail(url=self.source.thumbnail)
                .set_author(name=self.requester.name, icon_url=self.requester.avatar_url))
        return embed


class SongQueue(asyncio.Queue):
    def __getitem__(self, item):
        if isinstance(item, slice):
            return list(itertools.islice(self._queue, item.start, item.stop, item.step))
        else:
            return self._queue[item]

    def __iter__(self):
        return self._queue.__iter__()

    def __len__(self):
        return self.qsize()

    def clear(self):
        self._queue.clear()

    def shuffle(self):
        random.shuffle(self._queue)

    def remove(self, index: int):
        del self._queue[index]


class VoiceState:
    def __init__(self, bot: commands.Bot, ctx: commands.Context):
        self.bot = bot
        self._ctx = ctx

        self.current = None
        self.voice = None
        self.next = asyncio.Event()
        self.songs = SongQueue()
        self.exists = True

        self._loop = False
        self._autoplay = True
        self._volume = 0.5
        self.skip_votes = set()

        self.audio_player = bot.loop.create_task(self.audio_player_task())

    def __del__(self):
        self.audio_player.cancel()

    @property
    def loop(self):
        return self._loop

    @loop.setter
    def loop(self, value: bool):
        self._loop = value

    @property
    def autoplay(self):
        return self._autoplay

    @autoplay.setter
    def autoplay(self, value: bool):
        self._autoplay = value

    @property
    def volume(self):
        return self._volume

    @volume.setter
    def volume(self, value: float):
        self._volume = value

    @property
    def is_playing(self):
        return self.voice and self.current

    async def audio_player_task(self):
        while True:
            self.next.clear()
            self.now = None

            if self.loop == False:
                # If autoplay is turned on wait 3 seconds for a new song.
                # If no song is found find a new one,
                # else if autoplay is turned off try to get the
                # next song within 3 minutes.
                # If no song will be added to the queue in time,
                # the player will disconnect due to performance
                # reasons.
                if self.autoplay:
                    try:
                        async with timeout(3): 
                            self.current = await self.songs.get()
                    except asyncio.TimeoutError:
                        # Spoof user agent to show whole page.
                        headers = {'User-Agent' : 'Mozilla/5.0 (compatible; Bingbot/2.0; +http://www.bing.com/bingbot.htm)'}
                        song_url = self.current.source.url
                        # Get the page
                        async with httpx.AsyncClient() as client:
                            response = await client.get(song_url, headers=headers)

                        soup = BeautifulSoup(response.text, features='lxml')

                        # Parse all the recommended videos out of the response and store them in a list
                        recommended_urls = []
                        for li in soup.find_all('li', class_='related-list-item'):
                            a = li.find('a')

                            # Only videos (no mixes or playlists)
                            if 'content-link' in a.attrs['class']:
                                recommended_urls.append(f'https://www.youtube.com{a.get("href")}')

                        ctx = self._ctx

                        async with ctx.typing():
                            try:
                                source = await YTDLSource.create_source(ctx, recommended_urls[0], loop=self.bot.loop)
                            except YTDLError as e:
                                await ctx.send('An error occurred while processing this request: {}'.format(str(e)))
                                self.bot.loop.create_task(self.stop())
                                self.exists = False
                                return
                            else:
                                song = Song(source)
                                self.current = song
                                await ctx.send('Enqueued {}'.format(str(source)))
                        
                else:
                    try:
                        async with timeout(180):  # 3 minutes
                            self.current = await self.songs.get()
                    except asyncio.TimeoutError:
                        self.bot.loop.create_task(self.stop())
                        self.exists = False
                        return
                
                self.current.source.volume = self._volume
                self.voice.play(self.current.source, after=self.play_next_song)
                await self.current.source.channel.send(embed=self.current.create_embed())
            
            #If the song is looped
            elif self.loop == True:
                self.now = discord.FFmpegPCMAudio(self.current.source.stream_url, **YTDLSource.FFMPEG_OPTIONS)
                self.voice.play(self.now, after=self.play_next_song)
            
            await self.next.wait()

    def play_next_song(self, error=None):
        if error:
            raise VoiceError(str(error))

        self.next.set()

    def skip(self):
        self.skip_votes.clear()

        if self.is_playing:
            self.voice.stop()

    async def stop(self):
        self.songs.clear()

        if self.voice:
            await self.voice.disconnect()
            self.voice = None


class Music(commands.Cog):
    def __init__(self, bot: commands.Bot):
        self.bot = bot
        self.voice_states = {}

    def get_voice_state(self, ctx: commands.Context):
        state = self.voice_states.get(ctx.guild.id)
        if not state or not state.exists:
            state = VoiceState(self.bot, ctx)
            self.voice_states[ctx.guild.id] = state

        return state

    def cog_unload(self):
        for state in self.voice_states.values():
            self.bot.loop.create_task(state.stop())

    def cog_check(self, ctx: commands.Context):
        if not ctx.guild:
            raise commands.NoPrivateMessage('This command can\'t be used in DM channels.')

        return True

    async def cog_before_invoke(self, ctx: commands.Context):
        ctx.voice_state = self.get_voice_state(ctx)

    async def cog_command_error(self, ctx: commands.Context, error: commands.CommandError):
        await ctx.send('An error occurred: {}'.format(str(error)))

    @commands.Cog.listener()
    async def on_message(self, message):
        if message.author.id != bot.user.id:
            print(f"{message.guild}/{message.channel}/{message.author.name}>{message.content}")
            if message.embeds:
                print(message.embeds[0].to_dict())

    @commands.command(name='join', invoke_without_subcommand=True)
    async def _join(self, ctx: commands.Context):
        """Joins a voice channel."""

        destination = ctx.author.voice.channel
        if ctx.voice_state.voice:
            await ctx.voice_state.voice.move_to(destination)
            return

        ctx.voice_state.voice = await destination.connect()

    @commands.command(name='summon')
    @commands.has_permissions(manage_guild=True)
    async def _summon(self, ctx: commands.Context, *, channel: discord.VoiceChannel = None):
        """Summons the bot to a voice channel.
        If no channel was specified, it joins your channel.
        """

        if not channel and not ctx.author.voice:
            raise VoiceError('You are neither connected to a voice channel nor specified a channel to join.')

        destination = channel or ctx.author.voice.channel
        if ctx.voice_state.voice:
            await ctx.voice_state.voice.move_to(destination)
            return

        ctx.voice_state.voice = await destination.connect()

    @commands.command(name='leave', aliases=['disconnect'])
    @commands.has_permissions(manage_guild=True)
    async def _leave(self, ctx: commands.Context):
        """Clears the queue and leaves the voice channel."""

        if not ctx.voice_state.voice:
            return await ctx.send('Not connected to any voice channel.')

        await ctx.voice_state.stop()
        del self.voice_states[ctx.guild.id]

    @commands.command(name='volume')
    @commands.is_owner()
    async def _volume(self, ctx: commands.Context, *, volume: int):
        """Sets the volume of the player."""

        if not ctx.voice_state.is_playing:
            return await ctx.send('Nothing being played at the moment.')

        if 0 > volume > 100:
            return await ctx.send('Volume must be between 0 and 100')

        ctx.voice_state.volume = volume / 100
        await ctx.send('Volume of the player set to {}%'.format(volume))

    @commands.command(name='now', aliases=['current', 'playing'])
    async def _now(self, ctx: commands.Context):
        """Displays the currently playing song."""
        embed = ctx.voice_state.current.create_embed()
        await ctx.send(embed=embed)

    @commands.command(name='pause', aliases=['pa'])
    @commands.has_permissions(manage_guild=True)
    async def _pause(self, ctx: commands.Context):
        """Pauses the currently playing song."""
        print(">>>Pause Command:")
        if ctx.voice_state.is_playing and ctx.voice_state.voice.is_playing():
            ctx.voice_state.voice.pause()
            await ctx.message.add_reaction('⏯')

    @commands.command(name='resume', aliases=['re', 'res'])
    @commands.has_permissions(manage_guild=True)
    async def _resume(self, ctx: commands.Context):
        """Resumes a currently paused song."""

        if ctx.voice_state.is_playing and ctx.voice_state.voice.is_paused():
            ctx.voice_state.voice.resume()
            await ctx.message.add_reaction('⏯')

    @commands.command(name='stop')
    @commands.has_permissions(manage_guild=True)
    async def _stop(self, ctx: commands.Context):
        """Stops playing song and clears the queue."""

        ctx.voice_state.songs.clear()

        if ctx.voice_state.is_playing:
            ctx.voice_state.voice.stop()
            await ctx.message.add_reaction('⏹')

    @commands.command(name='skip', aliases=['s'])
    async def _skip(self, ctx: commands.Context):
        """Vote to skip a song. The requester can automatically skip.
        3 skip votes are needed for the song to be skipped.
        """

        if not ctx.voice_state.is_playing:
            return await ctx.send('Not playing any music right now...')

        voter = ctx.message.author
        if voter == ctx.voice_state.current.requester:
            await ctx.message.add_reaction('⏭')
            ctx.voice_state.skip()

        elif voter.id not in ctx.voice_state.skip_votes:
            ctx.voice_state.skip_votes.add(voter.id)
            total_votes = len(ctx.voice_state.skip_votes)

            if total_votes >= 3:
                await ctx.message.add_reaction('⏭')
                ctx.voice_state.skip()
            else:
                await ctx.send('Skip vote added, currently at **{}/3**'.format(total_votes))

        else:
            await ctx.send('You have already voted to skip this song.')

    @commands.command(name='queue')
    async def _queue(self, ctx: commands.Context, *, page: int = 1):
        """Shows the player's queue.
        You can optionally specify the page to show. Each page contains 10 elements.
        """

        if len(ctx.voice_state.songs) == 0:
            return await ctx.send('Empty queue.')

        items_per_page = 10
        pages = math.ceil(len(ctx.voice_state.songs) / items_per_page)

        start = (page - 1) * items_per_page
        end = start + items_per_page

        queue = ''
        for i, song in enumerate(ctx.voice_state.songs[start:end], start=start):
            queue += '`{0}.` [**{1.source.title}**]({1.source.url})\n'.format(i + 1, song)

        embed = (discord.Embed(description='**{} tracks:**\n\n{}'.format(len(ctx.voice_state.songs), queue))
                 .set_footer(text='Viewing page {}/{}'.format(page, pages)))
        await ctx.send(embed=embed)

    @commands.command(name='shuffle')
    async def _shuffle(self, ctx: commands.Context):
        """Shuffles the queue."""

        if len(ctx.voice_state.songs) == 0:
            return await ctx.send('Empty queue.')

        ctx.voice_state.songs.shuffle()
        await ctx.message.add_reaction('✅')

    @commands.command(name='remove')
    async def _remove(self, ctx: commands.Context, index: int):
        """Removes a song from the queue at a given index."""

        if len(ctx.voice_state.songs) == 0:
            return await ctx.send('Empty queue.')

        ctx.voice_state.songs.remove(index - 1)
        await ctx.message.add_reaction('✅')

    @commands.command(name='loop')
    async def _loop(self, ctx: commands.Context):
        """Loops the currently playing song.
        Invoke this command again to unloop the song.
        """

        if not ctx.voice_state.is_playing:
            return await ctx.send('Nothing being played at the moment.')

        # Inverse boolean value to loop and unloop.
        ctx.voice_state.loop = not ctx.voice_state.loop
        await ctx.message.add_reaction('✅')
        await ctx.send('Looping a song is now turned ' + ('on' if ctx.voice_state.loop else 'off') )

    @commands.command(name='autoplay')
    async def _autoplay(self, ctx: commands.Context):
        """Automatically queue a new song that is related to the song at the end of the queue.
        Invoke this command again to toggle autoplay the song.
        """

        if not ctx.voice_state.is_playing:
            return await ctx.send('Nothing being played at the moment.')

        # Inverse boolean value to loop and unloop.
        ctx.voice_state.autoplay = not ctx.voice_state.autoplay
        await ctx.message.add_reaction('✅')
        await ctx.send('Autoplay after end of queue is now ' + ('on' if ctx.voice_state.autoplay else 'off') )

    @commands.command(name='play', aliases=['p'])
    async def _play(self, ctx: commands.Context, *, search: str):
        """Plays a song.
        If there are songs in the queue, this will be queued until the
        other songs finished playing.
        This command automatically searches from various sites if no URL is provided.
        A list of these sites can be found here: https://rg3.github.io/youtube-dl/supportedsites.html
        """

        async with ctx.typing():
            try:
                source = await YTDLSource.create_source(ctx, search, loop=self.bot.loop)
            except YTDLError as e:
                await ctx.send('An error occurred while processing this request: {}'.format(str(e)))
            else:
                if not ctx.voice_state.voice:
                    await ctx.invoke(self._join)

                song = Song(source)
                await ctx.voice_state.songs.put(song)
                await ctx.send('Enqueued {}'.format(str(source)))

    @commands.command(name='search')
    async def _search(self, ctx: commands.Context, *, search: str):
        """Searches youtube.
        It returns an imbed of the first 10 results collected from youtube.
        Then the user can choose one of the titles by typing a number
        in chat or they can cancel by typing "cancel" in chat.
        Each title in the list can be clicked as a link.
        """
        async with ctx.typing():
            try:
                source = await YTDLSource.search_source(ctx, search, loop=self.bot.loop)
            except YTDLError as e:
                await ctx.send('An error occurred while processing this request: {}'.format(str(e)))
            else:
                if source == 'sel_invalid':
                    await ctx.send('Invalid selection')
                elif source == 'cancel':
                    await ctx.send(':white_check_mark:')
                elif source == 'timeout':
                    await ctx.send(':alarm_clock: **Time\'s up bud**')
                else:
                    if not ctx.voice_state.voice:
                        await ctx.invoke(self._join)

                    song = Song(source)
                    await ctx.voice_state.songs.put(song)
                    await ctx.send('Enqueued {}'.format(str(source)))
            
    @_join.before_invoke
    @_play.before_invoke
    async def ensure_voice_state(self, ctx: commands.Context):
        if not ctx.author.voice or not ctx.author.voice.channel:
            raise commands.CommandError('You are not connected to any voice channel.')

        if ctx.voice_client:
            if ctx.voice_client.channel != ctx.author.voice.channel:
                raise commands.CommandError('Bot is already in a voice channel.')


bot = commands.Bot(command_prefix='|', case_insensitive=True, description="The Superior Bot")
bot.add_cog(Music(bot))


@bot.event
async def on_ready():
    print('Logged in as:\n{0.user.name}\n{0.user.id}'.format(bot))

@bot.command(name='botstop', aliases=['bstop'])
@commands.is_owner()
async def botstop(ctx):
    print('Goodbye')
    await ctx.send('Goodbye')
    await bot.logout()
    return

bot.run(token)

on line 164, im getting bot is not defined

@justanothernoob4648 If you modify where you're defining the search_source function to look like this async def search_source(self, ctx: commands.Context, search: str, *, loop: asyncio.BaseEventLoop = None, bot):

and then in the _search function in the Music class you modify where it calls the search_source function to look like this source = await YTDLSource.search_source(ctx, search, loop=self.bot.loop, bot=self.bot)

This makes it so that you're passing in the bot object into the search_source function, resolving the problem

def init(self, ctx: commands.Context, source: discord.FFmpegPCMAudio, *, data: dict, volume: float = 0.5):
^
SyntaxError: invalid syntax
[Finished in 0.045s]

So how to fix this?

@MalGamerz I think you're problem might be that you've put init(self, instead of __init__(self,

It should look something like this def __init__(self, ctx: commands.Context, source: discord.FFmpegPCMAudio, *, data: dict, volume: float = 0.5):

i have got a error called raceback (most recent call last):
File "d:\Discord Bots\Mika_Bot\index.py", line 13, in
import httpx
ModuleNotFoundError: No module named 'httpx'
PS D:\Discord Bots\Mika_Bot>

@Dinethrashmika-Coder

1. You'll have to install it:
   pip install httpx
   Also u have to do th above command in the cmd...

How to get to cmd???

1. [WIN] + [R] 
2. Type cmd
3. Hit [ENTER]
4. Execute the pip command

Everything works fine but the bot does not play music even after printing await ctx.send('Enqueued {}'.format(str(source)))

despite adding search_source
Command raised an exception: AttributeError: type object 'YTDLSource' has no attribute 'search_source'
An error occurs.

i am getting error when use play command Unable to extract uploader id