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import os
import sys
import youtube_dl
from collections import OrderedDict
import asyncio
import multiprocessing
import logging
log = logging.getLogger('ytdl')
class DownloadQueueNotifier:
async def added(self, dl):
raise NotImplementedError
async def updated(self, dl):
raise NotImplementedError
async def completed(self, dl):
raise NotImplementedError
async def canceled(self, id):
raise NotImplementedError
async def cleared(self, id):
raise NotImplementedError
class DownloadInfo:
def __init__(self, id, title, url):
self.id, self.title, self.url = id, title, url
self.status = self.msg = self.percent = self.speed = self.eta = None
class Download:
manager = None
def __init__(self, download_dir, info):
self.download_dir = download_dir
self.info = info
self.canceled = False
self.tmpfilename = None
self.status_queue = None
self.proc = None
self.loop = None
self.notifier = None
def _download(self):
try:
ret = youtube_dl.YoutubeDL(params={
'quiet': True,
'no_color': True,
#'skip_download': True,
'outtmpl': os.path.join(self.download_dir, '%(title)s.%(ext)s'),
'cachedir': False,
'socket_timeout': 30,
'progress_hooks': [lambda d: self.status_queue.put(d)],
}).download([self.info.url])
self.status_queue.put({'status': 'finished' if ret == 0 else 'error'})
except youtube_dl.utils.YoutubeDLError as exc:
self.status_queue.put({'status': 'error', 'msg': str(exc)})
async def start(self, notifier):
if Download.manager is None:
Download.manager = multiprocessing.Manager()
self.status_queue = Download.manager.Queue()
self.proc = multiprocessing.Process(target=self._download)
self.proc.start()
self.loop = asyncio.get_running_loop()
self.notifier = notifier
self.info.status = 'preparing'
await self.notifier.updated(self.info)
asyncio.ensure_future(self.update_status())
return await self.loop.run_in_executor(None, self.proc.join)
def cancel(self):
if self.running():
self.proc.kill()
self.canceled = True
def close(self):
if self.started():
self.proc.close()
self.status_queue.put(None)
def running(self):
try:
return self.proc is not None and self.proc.is_alive()
except ValueError:
return False
def started(self):
return self.proc is not None
async def update_status(self):
while True:
status = await self.loop.run_in_executor(None, self.status_queue.get)
if status is None:
return
self.tmpfilename = status.get('tmpfilename')
self.info.status = status['status']
self.info.msg = status.get('msg')
if 'downloaded_bytes' in status:
total = status.get('total_bytes') or status.get('total_bytes_estimate')
if total:
self.info.percent = status['downloaded_bytes'] / total * 100
self.info.speed = status.get('speed')
self.info.eta = status.get('eta')
await self.notifier.updated(self.info)
class DownloadQueue:
def __init__(self, config, notifier):
self.config = config
self.notifier = notifier
self.queue = OrderedDict()
self.done = OrderedDict()
self.event = asyncio.Event()
asyncio.ensure_future(self.__download())
def __extract_info(self, url):
return youtube_dl.YoutubeDL(params={
'quiet': True,
'no_color': True,
'extract_flat': True,
}).extract_info(url, download=False)
async def __add_entry(self, entry, already):
etype = entry.get('_type') or 'video'
if etype == 'playlist':
entries = entry['entries']
log.info(f'playlist detected with {len(entries)} entries')
results = []
for etr in entries:
results.append(await self.__add_entry(etr, already))
if any(res['status'] == 'error' for res in results):
return {'status': 'error', 'msg': ', '.join(res['msg'] for res in results if res['status'] == 'error' and 'msg' in res)}
return {'status': 'ok'}
elif etype == 'video' or etype == 'url' and 'id' in entry:
if entry['id'] not in self.queue:
dl = DownloadInfo(entry['id'], entry['title'], entry.get('webpage_url') or entry['url'])
self.queue[entry['id']] = Download(self.config.DOWNLOAD_DIR, dl)
self.event.set()
await self.notifier.added(dl)
return {'status': 'ok'}
elif etype == 'url':
return await self.add(entry['url'], already)
return {'status': 'error', 'msg': f'Unsupported resource "{etype}"'}
async def add(self, url, already=None):
log.info(f'adding {url}')
already = set() if already is None else already
if url in already:
log.info('recursion detected, skipping')
return {'status': 'ok'}
else:
already.add(url)
try:
entry = await asyncio.get_running_loop().run_in_executor(None, self.__extract_info, url)
except youtube_dl.utils.YoutubeDLError as exc:
return {'status': 'error', 'msg': str(exc)}
return await self.__add_entry(entry, already)
async def cancel(self, ids):
for id in ids:
if id not in self.queue:
log.warn(f'requested cancel for non-existent download {id}')
continue
if self.queue[id].started():
self.queue[id].cancel()
else:
del self.queue[id]
await self.notifier.canceled(id)
return {'status': 'ok'}
async def clear(self, ids):
for id in ids:
if id not in self.done:
log.warn(f'requested delete for non-existent download {id}')
continue
del self.done[id]
await self.notifier.cleared(id)
return {'status': 'ok'}
def get(self):
return(list((k, v.info) for k, v in self.queue.items()),
list((k, v.info) for k, v in self.done.items()))
async def __download(self):
while True:
while not self.queue:
log.info('waiting for item to download')
await self.event.wait()
self.event.clear()
id, entry = next(iter(self.queue.items()))
log.info(f'downloading {entry.info.title}')
await entry.start(self.notifier)
if entry.info.status != 'finished':
if entry.tmpfilename and os.path.isfile(entry.tmpfilename):
try:
os.remove(entry.tmpfilename)
except:
pass
entry.info.status = 'error'
entry.close()
if id in self.queue:
del self.queue[id]
if entry.canceled:
await self.notifier.canceled(id)
else:
self.done[id] = entry
await self.notifier.completed(entry.info)
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