我一直在使用discord.py重写为python编写音乐bot。它通过youtube-dl下载视频,然后通过语音聊天播放。我一直在努力扩展音乐,最近发现我完全忽略了某些东西。 youtube-dl的progress hooks
选项是同步的,而discord.py是异步的。 youtube-dl在下载视频时会生成一个子进程,而不是在当前线程上运行它,因此它不会挂起程序。下载完成后,我需要运行的功能是协程,因为它是discord.py的一部分
TL; DR,当youtube-dl下载完成时,我需要运行协程
我知道这是可能的,我之前看过它,但是不太了解。
这是我到目前为止的内容:
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])
答案 0 :(得分:4)
从阻塞代码安排协程异步执行的最简单方法是loop.create_task
。由于callback
继承了封闭的play
方法的范围,因此我们可以直接使用self.bot.loop
:
def callback(d):
if d['status'] == 'finished':
self.bot.loop.create_task(ctx.send("Done!"))
print("Done!")