269 lines
10 KiB
Python
269 lines
10 KiB
Python
from __future__ import division, unicode_literals
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import os
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import time
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import json
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from .common import FileDownloader
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from .http import HttpFD
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from ..utils import (
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error_to_compat_str,
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encodeFilename,
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sanitize_open,
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sanitized_Request,
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)
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class HttpQuietDownloader(HttpFD):
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def to_screen(self, *args, **kargs):
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pass
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class FragmentFD(FileDownloader):
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"""
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A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests).
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Available options:
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fragment_retries: Number of times to retry a fragment for HTTP error (DASH
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and hlsnative only)
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skip_unavailable_fragments:
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Skip unavailable fragments (DASH and hlsnative only)
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keep_fragments: Keep downloaded fragments on disk after downloading is
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finished
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For each incomplete fragment download youtube-dl keeps on disk a special
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bookkeeping file with download state and metadata (in future such files will
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be used for any incomplete download handled by youtube-dl). This file is
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used to properly handle resuming, check download file consistency and detect
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potential errors. The file has a .ytdl extension and represents a standard
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JSON file of the following format:
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extractor:
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Dictionary of extractor related data. TBD.
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downloader:
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Dictionary of downloader related data. May contain following data:
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current_fragment:
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Dictionary with current (being downloaded) fragment data:
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index: 0-based index of current fragment among all fragments
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fragment_count:
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Total count of fragments
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This feature is experimental and file format may change in future.
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"""
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def report_retry_fragment(self, err, frag_index, count, retries):
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self.to_screen(
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'[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...'
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% (error_to_compat_str(err), frag_index, count, self.format_retries(retries)))
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def report_skip_fragment(self, frag_index):
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self.to_screen('[download] Skipping fragment %d...' % frag_index)
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def _prepare_url(self, info_dict, url):
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headers = info_dict.get('http_headers')
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return sanitized_Request(url, None, headers) if headers else url
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def _prepare_and_start_frag_download(self, ctx):
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self._prepare_frag_download(ctx)
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self._start_frag_download(ctx)
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@staticmethod
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def __do_ytdl_file(ctx):
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return not ctx['live'] and not ctx['tmpfilename'] == '-'
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def _read_ytdl_file(self, ctx):
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assert 'ytdl_corrupt' not in ctx
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stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r')
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try:
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ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index']
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except Exception:
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ctx['ytdl_corrupt'] = True
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finally:
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stream.close()
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def _write_ytdl_file(self, ctx):
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frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
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downloader = {
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'current_fragment': {
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'index': ctx['fragment_index'],
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},
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}
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if ctx.get('fragment_count') is not None:
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downloader['fragment_count'] = ctx['fragment_count']
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frag_index_stream.write(json.dumps({'downloader': downloader}))
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frag_index_stream.close()
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def _download_fragment(self, ctx, frag_url, info_dict, headers=None):
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fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], ctx['fragment_index'])
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success = ctx['dl'].download(fragment_filename, {
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'url': frag_url,
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'http_headers': headers or info_dict.get('http_headers'),
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})
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if not success:
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return False, None
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down, frag_sanitized = sanitize_open(fragment_filename, 'rb')
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ctx['fragment_filename_sanitized'] = frag_sanitized
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frag_content = down.read()
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down.close()
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return True, frag_content
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def _append_fragment(self, ctx, frag_content):
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try:
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ctx['dest_stream'].write(frag_content)
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ctx['dest_stream'].flush()
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finally:
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if self.__do_ytdl_file(ctx):
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self._write_ytdl_file(ctx)
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if not self.params.get('keep_fragments', False):
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os.remove(encodeFilename(ctx['fragment_filename_sanitized']))
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del ctx['fragment_filename_sanitized']
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def _prepare_frag_download(self, ctx):
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if 'live' not in ctx:
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ctx['live'] = False
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if not ctx['live']:
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total_frags_str = '%d' % ctx['total_frags']
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ad_frags = ctx.get('ad_frags', 0)
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if ad_frags:
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total_frags_str += ' (not including %d ad)' % ad_frags
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else:
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total_frags_str = 'unknown (live)'
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self.to_screen(
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'[%s] Total fragments: %s' % (self.FD_NAME, total_frags_str))
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self.report_destination(ctx['filename'])
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dl = HttpQuietDownloader(
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self.ydl,
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{
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'continuedl': True,
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'quiet': True,
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'noprogress': True,
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'ratelimit': self.params.get('ratelimit'),
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'retries': self.params.get('retries', 0),
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'nopart': self.params.get('nopart', False),
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'test': self.params.get('test', False),
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}
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)
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tmpfilename = self.temp_name(ctx['filename'])
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open_mode = 'wb'
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resume_len = 0
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# Establish possible resume length
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if os.path.isfile(encodeFilename(tmpfilename)):
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open_mode = 'ab'
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resume_len = os.path.getsize(encodeFilename(tmpfilename))
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# Should be initialized before ytdl file check
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ctx.update({
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'tmpfilename': tmpfilename,
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'fragment_index': 0,
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})
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if self.__do_ytdl_file(ctx):
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if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))):
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self._read_ytdl_file(ctx)
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is_corrupt = ctx.get('ytdl_corrupt') is True
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is_inconsistent = ctx['fragment_index'] > 0 and resume_len == 0
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if is_corrupt or is_inconsistent:
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message = (
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'.ytdl file is corrupt' if is_corrupt else
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'Inconsistent state of incomplete fragment download')
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self.report_warning(
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'%s. Restarting from the beginning...' % message)
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ctx['fragment_index'] = resume_len = 0
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if 'ytdl_corrupt' in ctx:
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del ctx['ytdl_corrupt']
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self._write_ytdl_file(ctx)
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else:
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self._write_ytdl_file(ctx)
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assert ctx['fragment_index'] == 0
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dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode)
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ctx.update({
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'dl': dl,
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'dest_stream': dest_stream,
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'tmpfilename': tmpfilename,
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# Total complete fragments downloaded so far in bytes
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'complete_frags_downloaded_bytes': resume_len,
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})
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def _start_frag_download(self, ctx):
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total_frags = ctx['total_frags']
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# This dict stores the download progress, it's updated by the progress
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# hook
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state = {
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'status': 'downloading',
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'downloaded_bytes': ctx['complete_frags_downloaded_bytes'],
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'fragment_index': ctx['fragment_index'],
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'fragment_count': total_frags,
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'filename': ctx['filename'],
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'tmpfilename': ctx['tmpfilename'],
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}
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start = time.time()
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ctx.update({
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'started': start,
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# Amount of fragment's bytes downloaded by the time of the previous
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# frag progress hook invocation
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'prev_frag_downloaded_bytes': 0,
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})
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def frag_progress_hook(s):
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if s['status'] not in ('downloading', 'finished'):
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return
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time_now = time.time()
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state['elapsed'] = time_now - start
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frag_total_bytes = s.get('total_bytes') or 0
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if not ctx['live']:
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estimated_size = (
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(ctx['complete_frags_downloaded_bytes'] + frag_total_bytes)
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/ (state['fragment_index'] + 1) * total_frags)
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state['total_bytes_estimate'] = estimated_size
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if s['status'] == 'finished':
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state['fragment_index'] += 1
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ctx['fragment_index'] = state['fragment_index']
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state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
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ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
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ctx['prev_frag_downloaded_bytes'] = 0
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else:
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frag_downloaded_bytes = s['downloaded_bytes']
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state['downloaded_bytes'] += frag_downloaded_bytes - ctx['prev_frag_downloaded_bytes']
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if not ctx['live']:
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state['eta'] = self.calc_eta(
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start, time_now, estimated_size,
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state['downloaded_bytes'])
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state['speed'] = s.get('speed') or ctx.get('speed')
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ctx['speed'] = state['speed']
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ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes
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self._hook_progress(state)
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ctx['dl'].add_progress_hook(frag_progress_hook)
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return start
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def _finish_frag_download(self, ctx):
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ctx['dest_stream'].close()
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if self.__do_ytdl_file(ctx):
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ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename']))
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if os.path.isfile(ytdl_filename):
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os.remove(ytdl_filename)
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elapsed = time.time() - ctx['started']
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if ctx['tmpfilename'] == '-':
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downloaded_bytes = ctx['complete_frags_downloaded_bytes']
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else:
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self.try_rename(ctx['tmpfilename'], ctx['filename'])
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downloaded_bytes = os.path.getsize(encodeFilename(ctx['filename']))
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self._hook_progress({
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'downloaded_bytes': downloaded_bytes,
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'total_bytes': downloaded_bytes,
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'filename': ctx['filename'],
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'status': 'finished',
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'elapsed': elapsed,
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})
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