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[youtubedl] / youtube_dl / downloader / fragment.py
1 from __future__ import division, unicode_literals
2
3 import os
4 import time
5 import json
6
7 from .common import FileDownloader
8 from .http import HttpFD
9 from ..utils import (
10 error_to_compat_str,
11 encodeFilename,
12 sanitize_open,
13 sanitized_Request,
14 )
15
16
17 class HttpQuietDownloader(HttpFD):
18 def to_screen(self, *args, **kargs):
19 pass
20
21
22 class FragmentFD(FileDownloader):
23 """
24 A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests).
25
26 Available options:
27
28 fragment_retries: Number of times to retry a fragment for HTTP error (DASH
29 and hlsnative only)
30 skip_unavailable_fragments:
31 Skip unavailable fragments (DASH and hlsnative only)
32 keep_fragments: Keep downloaded fragments on disk after downloading is
33 finished
34
35 For each incomplete fragment download youtube-dl keeps on disk a special
36 bookkeeping file with download state and metadata (in future such files will
37 be used for any incomplete download handled by youtube-dl). This file is
38 used to properly handle resuming, check download file consistency and detect
39 potential errors. The file has a .ytdl extension and represents a standard
40 JSON file of the following format:
41
42 extractor:
43 Dictionary of extractor related data. TBD.
44
45 downloader:
46 Dictionary of downloader related data. May contain following data:
47 current_fragment:
48 Dictionary with current (being downloaded) fragment data:
49 index: 0-based index of current fragment among all fragments
50 fragment_count:
51 Total count of fragments
52
53 This feature is experimental and file format may change in future.
54 """
55
56 def report_retry_fragment(self, err, frag_index, count, retries):
57 self.to_screen(
58 '[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...'
59 % (error_to_compat_str(err), frag_index, count, self.format_retries(retries)))
60
61 def report_skip_fragment(self, frag_index):
62 self.to_screen('[download] Skipping fragment %d...' % frag_index)
63
64 def _prepare_url(self, info_dict, url):
65 headers = info_dict.get('http_headers')
66 return sanitized_Request(url, None, headers) if headers else url
67
68 def _prepare_and_start_frag_download(self, ctx):
69 self._prepare_frag_download(ctx)
70 self._start_frag_download(ctx)
71
72 @staticmethod
73 def __do_ytdl_file(ctx):
74 return not ctx['live'] and not ctx['tmpfilename'] == '-'
75
76 def _read_ytdl_file(self, ctx):
77 assert 'ytdl_corrupt' not in ctx
78 stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r')
79 try:
80 ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index']
81 except Exception:
82 ctx['ytdl_corrupt'] = True
83 finally:
84 stream.close()
85
86 def _write_ytdl_file(self, ctx):
87 frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w')
88 downloader = {
89 'current_fragment': {
90 'index': ctx['fragment_index'],
91 },
92 }
93 if ctx.get('fragment_count') is not None:
94 downloader['fragment_count'] = ctx['fragment_count']
95 frag_index_stream.write(json.dumps({'downloader': downloader}))
96 frag_index_stream.close()
97
98 def _download_fragment(self, ctx, frag_url, info_dict, headers=None):
99 fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], ctx['fragment_index'])
100 success = ctx['dl'].download(fragment_filename, {
101 'url': frag_url,
102 'http_headers': headers or info_dict.get('http_headers'),
103 })
104 if not success:
105 return False, None
106 down, frag_sanitized = sanitize_open(fragment_filename, 'rb')
107 ctx['fragment_filename_sanitized'] = frag_sanitized
108 frag_content = down.read()
109 down.close()
110 return True, frag_content
111
112 def _append_fragment(self, ctx, frag_content):
113 try:
114 ctx['dest_stream'].write(frag_content)
115 ctx['dest_stream'].flush()
116 finally:
117 if self.__do_ytdl_file(ctx):
118 self._write_ytdl_file(ctx)
119 if not self.params.get('keep_fragments', False):
120 os.remove(encodeFilename(ctx['fragment_filename_sanitized']))
121 del ctx['fragment_filename_sanitized']
122
123 def _prepare_frag_download(self, ctx):
124 if 'live' not in ctx:
125 ctx['live'] = False
126 if not ctx['live']:
127 total_frags_str = '%d' % ctx['total_frags']
128 ad_frags = ctx.get('ad_frags', 0)
129 if ad_frags:
130 total_frags_str += ' (not including %d ad)' % ad_frags
131 else:
132 total_frags_str = 'unknown (live)'
133 self.to_screen(
134 '[%s] Total fragments: %s' % (self.FD_NAME, total_frags_str))
135 self.report_destination(ctx['filename'])
136 dl = HttpQuietDownloader(
137 self.ydl,
138 {
139 'continuedl': True,
140 'quiet': True,
141 'noprogress': True,
142 'ratelimit': self.params.get('ratelimit'),
143 'retries': self.params.get('retries', 0),
144 'nopart': self.params.get('nopart', False),
145 'test': self.params.get('test', False),
146 }
147 )
148 tmpfilename = self.temp_name(ctx['filename'])
149 open_mode = 'wb'
150 resume_len = 0
151
152 # Establish possible resume length
153 if os.path.isfile(encodeFilename(tmpfilename)):
154 open_mode = 'ab'
155 resume_len = os.path.getsize(encodeFilename(tmpfilename))
156
157 # Should be initialized before ytdl file check
158 ctx.update({
159 'tmpfilename': tmpfilename,
160 'fragment_index': 0,
161 })
162
163 if self.__do_ytdl_file(ctx):
164 if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))):
165 self._read_ytdl_file(ctx)
166 is_corrupt = ctx.get('ytdl_corrupt') is True
167 is_inconsistent = ctx['fragment_index'] > 0 and resume_len == 0
168 if is_corrupt or is_inconsistent:
169 message = (
170 '.ytdl file is corrupt' if is_corrupt else
171 'Inconsistent state of incomplete fragment download')
172 self.report_warning(
173 '%s. Restarting from the beginning...' % message)
174 ctx['fragment_index'] = resume_len = 0
175 if 'ytdl_corrupt' in ctx:
176 del ctx['ytdl_corrupt']
177 self._write_ytdl_file(ctx)
178 else:
179 self._write_ytdl_file(ctx)
180 assert ctx['fragment_index'] == 0
181
182 dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode)
183
184 ctx.update({
185 'dl': dl,
186 'dest_stream': dest_stream,
187 'tmpfilename': tmpfilename,
188 # Total complete fragments downloaded so far in bytes
189 'complete_frags_downloaded_bytes': resume_len,
190 })
191
192 def _start_frag_download(self, ctx):
193 resume_len = ctx['complete_frags_downloaded_bytes']
194 total_frags = ctx['total_frags']
195 # This dict stores the download progress, it's updated by the progress
196 # hook
197 state = {
198 'status': 'downloading',
199 'downloaded_bytes': resume_len,
200 'fragment_index': ctx['fragment_index'],
201 'fragment_count': total_frags,
202 'filename': ctx['filename'],
203 'tmpfilename': ctx['tmpfilename'],
204 }
205
206 start = time.time()
207 ctx.update({
208 'started': start,
209 # Amount of fragment's bytes downloaded by the time of the previous
210 # frag progress hook invocation
211 'prev_frag_downloaded_bytes': 0,
212 })
213
214 def frag_progress_hook(s):
215 if s['status'] not in ('downloading', 'finished'):
216 return
217
218 time_now = time.time()
219 state['elapsed'] = time_now - start
220 frag_total_bytes = s.get('total_bytes') or 0
221 if not ctx['live']:
222 estimated_size = (
223 (ctx['complete_frags_downloaded_bytes'] + frag_total_bytes)
224 / (state['fragment_index'] + 1) * total_frags)
225 state['total_bytes_estimate'] = estimated_size
226
227 if s['status'] == 'finished':
228 state['fragment_index'] += 1
229 ctx['fragment_index'] = state['fragment_index']
230 state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes']
231 ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes']
232 ctx['prev_frag_downloaded_bytes'] = 0
233 else:
234 frag_downloaded_bytes = s['downloaded_bytes']
235 state['downloaded_bytes'] += frag_downloaded_bytes - ctx['prev_frag_downloaded_bytes']
236 if not ctx['live']:
237 state['eta'] = self.calc_eta(
238 start, time_now, estimated_size - resume_len,
239 state['downloaded_bytes'] - resume_len)
240 state['speed'] = s.get('speed') or ctx.get('speed')
241 ctx['speed'] = state['speed']
242 ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes
243 self._hook_progress(state)
244
245 ctx['dl'].add_progress_hook(frag_progress_hook)
246
247 return start
248
249 def _finish_frag_download(self, ctx):
250 ctx['dest_stream'].close()
251 if self.__do_ytdl_file(ctx):
252 ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename']))
253 if os.path.isfile(ytdl_filename):
254 os.remove(ytdl_filename)
255 elapsed = time.time() - ctx['started']
256
257 if ctx['tmpfilename'] == '-':
258 downloaded_bytes = ctx['complete_frags_downloaded_bytes']
259 else:
260 self.try_rename(ctx['tmpfilename'], ctx['filename'])
261 downloaded_bytes = os.path.getsize(encodeFilename(ctx['filename']))
262
263 self._hook_progress({
264 'downloaded_bytes': downloaded_bytes,
265 'total_bytes': downloaded_bytes,
266 'filename': ctx['filename'],
267 'status': 'finished',
268 'elapsed': elapsed,
269 })