How do I get discord bot to send a message to channel after it disconnects?

Question

For my discord bot, I want it to send a message after it has left a voice channel to only the text channel that the command was used. I've tried doing this through an event, but that sent a message to every channel.

Here is my code:

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


    
    @commands.Cog.listener()
    async def on_voice_state_update(self, member, before, after):

        if not member.id == self.bot.user.id:                       
            return

        elif before.channel is None:                                
            voice = after.channel.guild.voice_client
            time = 0
            while True:
                await asyncio.sleep(1)                              
                time += 1
                if voice.is_playing() and not voice.is_paused():
                    time = 0
                if time == 10:
                    await voice.disconnect()
                if not voice.is_connected:                          
                    break
            
                    
    
    @commands.command(pass_context = True)
    async def play(self, ctx):
        if ctx.author.voice:
            channel = ctx.message.author.voice.channel
            await channel.connect()

Is there a way to detect when the bot leaves within the play command?

Answer 1

The on_voice_state_update event handler should handle any type of VoiceState change, and before and after hold data about the VoiceState before and after the change. In particular, after.channel is None if member got disconnected from before.channel. You can simply add the line at the beginning of your function.

VOICE_CHANNELS = {}

@commands.Cog.listener()
async def on_voice_state_update(self, member, before, after):
    # Make sure the member is the bot
    if not member.id == self.bot.user.id:                       
        return

    # Bot got disconnected
    if after.channel is None:
        text_channel = VOICE_CHANNELS.pop(before.channel.id)
        if text_channel:
            await text_channel.send("Disconnected!")

    # Bot got connected
    elif before.channel is None:                                
        voice = after.channel.guild.voice_client
        time = 0
        while True:
            await asyncio.sleep(1)                              
            time += 1
            if voice.is_playing() and not voice.is_paused():
                time = 0
            if time == 10:
                await voice.disconnect()
            if not voice.is_connected:                          
                break

@commands.command(pass_context = True)
async def play(self, ctx):
    if ctx.author.voice:
        channel = ctx.message.author.voice.channel
        await channel.connect()
        VOICE_CHANNELS[channel.id] = ctx.channel