youtube-dl完成下载后运行异步函数(python)

我一直在使用discord.py重写为python编写音乐机器人.它通过youtube-dl下载视频并在语音聊天中播放.我一直在努力扩展音乐,最近意识到我完全忽视了一些东西. youtube-dl的progress hooks选项是同步的,而discord.py是异步的. youtube-dl在下载视频时产生子进程,而不是在当前线程上运行它,因此它不会挂起程序.我需要在下载完成时运行的函数是一个协同程序,因为它是discord.py的一部分

TL; DR我需要在youtube-dl下载完成后运行协同程序

我知道这是可能的,我以前看过它,但不太明白.

这是我到目前为止所拥有的：

def log(text):
  print(Style.BRIGHT + Fore.WHITE + '[' + Fore.RED + 'Music' + Fore.WHITE + '] ' + Style.RESET_ALL + text)
def sync_config():
  raw_config.seek(0)
  raw_config.write(json.dumps(config))
  raw_config.truncate()
lookup_opts = {
    "simulate": True,
    "quiet" : True, #TODO: make this part of config.json
}

if not os.path.exists("plugins/music"):
  log("Config does not exist! Creating it for you..")
  os.makedirs("plugins/music")
if not os.path.exists("plugins/music/cache"):
  os.makedirs("plugins/music/cache")
if not os.path.exists("plugins/music/config.json"):
    with open('plugins/music/config.json', 'w+') as f:
      f.write('{}')
      log('Created config.json')
raw_config = open('plugins/music/config.json', 'r+')
config = json.load(raw_config)

class Music:
  def __init__(self, bot):
      self.bot = bot
  @commands.command(hidden=True)
  async def clearcache(self, ctx):
    if ctx.author.id in ctx.bot.config["admins"]:
      log("Cache cleared!")
      await ctx.message.add_reaction("✅")
      shutil.rmtree("plugins/music/cache")
      os.makedirs("plugins/music/cache")
    else:
      await ctx.send(ctx.bot.denied())
  @commands.command()
  async def play(self, ctx, url):
    """Download and play a link from youtube"""
    message = await ctx.send(f"Downloading <{url}>..")
    with youtube_dl.YoutubeDL(lookup_opts) as ydl:
      try:
        info = ydl.extract_info(url)
        await message.edit(content=f"Downloading {info['title']}..")
      except:
        await ctx.send("An error occured downloading that video! Are you sure that URL is correct?")
      def callback(d):
        if d['status'] == 'finished':
              loop = asyncio.new_event_loop()
              asyncio.set_event_loop(loop)
              loop.run_until_complete(ctx.send("Done!"))
              print("Done!")
      download_opts = {
        "format": 'm4a/bestaudio/best',
        "quiet" : True, #TODO: make this part of config.json
        'progress_hooks': [callback],
      }
      with youtube_dl.YoutubeDL(download_opts) as ydl:
          ydl.download([url])

解决方法:

从阻塞代码安排协同程序的异步执行的最简单方法是loop.create_task.由于回调继承了封闭play方法的范围,我们可以直接使用self.bot.loop：

  def callback(d):
    if d['status'] == 'finished':
          self.bot.loop.create_task(ctx.send("Done!"))
          print("Done!")

标签：python,python-3-x,discord-py,youtube-dl,discord-py-rewrite
来源： https://codeday.me/bug/20191006/1863166.html