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[youtubedl] / youtube_dl / downloader / common.py
1 from __future__ import division, unicode_literals
2
3 import os
4 import re
5 import sys
6 import time
7 import random
8
9 from ..compat import compat_os_name
10 from ..utils import (
11 decodeArgument,
12 encodeFilename,
13 error_to_compat_str,
14 format_bytes,
15 shell_quote,
16 timeconvert,
17 )
18
19
20 class FileDownloader(object):
21 """File Downloader class.
22
23 File downloader objects are the ones responsible of downloading the
24 actual video file and writing it to disk.
25
26 File downloaders accept a lot of parameters. In order not to saturate
27 the object constructor with arguments, it receives a dictionary of
28 options instead.
29
30 Available options:
31
32 verbose: Print additional info to stdout.
33 quiet: Do not print messages to stdout.
34 ratelimit: Download speed limit, in bytes/sec.
35 retries: Number of times to retry for HTTP error 5xx
36 buffersize: Size of download buffer in bytes.
37 noresizebuffer: Do not automatically resize the download buffer.
38 continuedl: Try to continue downloads if possible.
39 noprogress: Do not print the progress bar.
40 logtostderr: Log messages to stderr instead of stdout.
41 consoletitle: Display progress in console window's titlebar.
42 nopart: Do not use temporary .part files.
43 updatetime: Use the Last-modified header to set output file timestamps.
44 test: Download only first bytes to test the downloader.
45 min_filesize: Skip files smaller than this size
46 max_filesize: Skip files larger than this size
47 xattr_set_filesize: Set ytdl.filesize user xattribute with expected size.
48 (experimental)
49 external_downloader_args: A list of additional command-line arguments for the
50 external downloader.
51 hls_use_mpegts: Use the mpegts container for HLS videos.
52 http_chunk_size: Size of a chunk for chunk-based HTTP downloading. May be
53 useful for bypassing bandwidth throttling imposed by
54 a webserver (experimental)
55
56 Subclasses of this one must re-define the real_download method.
57 """
58
59 _TEST_FILE_SIZE = 10241
60 params = None
61
62 def __init__(self, ydl, params):
63 """Create a FileDownloader object with the given options."""
64 self.ydl = ydl
65 self._progress_hooks = []
66 self.params = params
67 self.add_progress_hook(self.report_progress)
68
69 @staticmethod
70 def format_seconds(seconds):
71 (mins, secs) = divmod(seconds, 60)
72 (hours, mins) = divmod(mins, 60)
73 if hours > 99:
74 return '--:--:--'
75 if hours == 0:
76 return '%02d:%02d' % (mins, secs)
77 else:
78 return '%02d:%02d:%02d' % (hours, mins, secs)
79
80 @staticmethod
81 def calc_percent(byte_counter, data_len):
82 if data_len is None:
83 return None
84 return float(byte_counter) / float(data_len) * 100.0
85
86 @staticmethod
87 def format_percent(percent):
88 if percent is None:
89 return '---.-%'
90 return '%6s' % ('%3.1f%%' % percent)
91
92 @staticmethod
93 def calc_eta(start, now, total, current):
94 if total is None:
95 return None
96 if now is None:
97 now = time.time()
98 dif = now - start
99 if current == 0 or dif < 0.001: # One millisecond
100 return None
101 rate = float(current) / dif
102 return int((float(total) - float(current)) / rate)
103
104 @staticmethod
105 def format_eta(eta):
106 if eta is None:
107 return '--:--'
108 return FileDownloader.format_seconds(eta)
109
110 @staticmethod
111 def calc_speed(start, now, bytes):
112 dif = now - start
113 if bytes == 0 or dif < 0.001: # One millisecond
114 return None
115 return float(bytes) / dif
116
117 @staticmethod
118 def format_speed(speed):
119 if speed is None:
120 return '%10s' % '---b/s'
121 return '%10s' % ('%s/s' % format_bytes(speed))
122
123 @staticmethod
124 def format_retries(retries):
125 return 'inf' if retries == float('inf') else '%.0f' % retries
126
127 @staticmethod
128 def best_block_size(elapsed_time, bytes):
129 new_min = max(bytes / 2.0, 1.0)
130 new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
131 if elapsed_time < 0.001:
132 return int(new_max)
133 rate = bytes / elapsed_time
134 if rate > new_max:
135 return int(new_max)
136 if rate < new_min:
137 return int(new_min)
138 return int(rate)
139
140 @staticmethod
141 def parse_bytes(bytestr):
142 """Parse a string indicating a byte quantity into an integer."""
143 matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
144 if matchobj is None:
145 return None
146 number = float(matchobj.group(1))
147 multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
148 return int(round(number * multiplier))
149
150 def to_screen(self, *args, **kargs):
151 self.ydl.to_screen(*args, **kargs)
152
153 def to_stderr(self, message):
154 self.ydl.to_screen(message)
155
156 def to_console_title(self, message):
157 self.ydl.to_console_title(message)
158
159 def trouble(self, *args, **kargs):
160 self.ydl.trouble(*args, **kargs)
161
162 def report_warning(self, *args, **kargs):
163 self.ydl.report_warning(*args, **kargs)
164
165 def report_error(self, *args, **kargs):
166 self.ydl.report_error(*args, **kargs)
167
168 def slow_down(self, start_time, now, byte_counter):
169 """Sleep if the download speed is over the rate limit."""
170 rate_limit = self.params.get('ratelimit')
171 if rate_limit is None or byte_counter == 0:
172 return
173 if now is None:
174 now = time.time()
175 elapsed = now - start_time
176 if elapsed <= 0.0:
177 return
178 speed = float(byte_counter) / elapsed
179 if speed > rate_limit:
180 time.sleep(max((byte_counter // rate_limit) - elapsed, 0))
181
182 def temp_name(self, filename):
183 """Returns a temporary filename for the given filename."""
184 if self.params.get('nopart', False) or filename == '-' or \
185 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
186 return filename
187 return filename + '.part'
188
189 def undo_temp_name(self, filename):
190 if filename.endswith('.part'):
191 return filename[:-len('.part')]
192 return filename
193
194 def ytdl_filename(self, filename):
195 return filename + '.ytdl'
196
197 def try_rename(self, old_filename, new_filename):
198 try:
199 if old_filename == new_filename:
200 return
201 os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
202 except (IOError, OSError) as err:
203 self.report_error('unable to rename file: %s' % error_to_compat_str(err))
204
205 def try_utime(self, filename, last_modified_hdr):
206 """Try to set the last-modified time of the given file."""
207 if last_modified_hdr is None:
208 return
209 if not os.path.isfile(encodeFilename(filename)):
210 return
211 timestr = last_modified_hdr
212 if timestr is None:
213 return
214 filetime = timeconvert(timestr)
215 if filetime is None:
216 return filetime
217 # Ignore obviously invalid dates
218 if filetime == 0:
219 return
220 try:
221 os.utime(filename, (time.time(), filetime))
222 except Exception:
223 pass
224 return filetime
225
226 def report_destination(self, filename):
227 """Report destination filename."""
228 self.to_screen('[download] Destination: ' + filename)
229
230 def _report_progress_status(self, msg, is_last_line=False):
231 fullmsg = '[download] ' + msg
232 if self.params.get('progress_with_newline', False):
233 self.to_screen(fullmsg)
234 else:
235 if compat_os_name == 'nt':
236 prev_len = getattr(self, '_report_progress_prev_line_length',
237 0)
238 if prev_len > len(fullmsg):
239 fullmsg += ' ' * (prev_len - len(fullmsg))
240 self._report_progress_prev_line_length = len(fullmsg)
241 clear_line = '\r'
242 else:
243 clear_line = ('\r\x1b[K' if sys.stderr.isatty() else '\r')
244 self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line)
245 self.to_console_title('youtube-dl ' + msg)
246
247 def report_progress(self, s):
248 if s['status'] == 'finished':
249 if self.params.get('noprogress', False):
250 self.to_screen('[download] Download completed')
251 else:
252 msg_template = '100%%'
253 if s.get('total_bytes') is not None:
254 s['_total_bytes_str'] = format_bytes(s['total_bytes'])
255 msg_template += ' of %(_total_bytes_str)s'
256 if s.get('elapsed') is not None:
257 s['_elapsed_str'] = self.format_seconds(s['elapsed'])
258 msg_template += ' in %(_elapsed_str)s'
259 self._report_progress_status(
260 msg_template % s, is_last_line=True)
261
262 if self.params.get('noprogress'):
263 return
264
265 if s['status'] != 'downloading':
266 return
267
268 if s.get('eta') is not None:
269 s['_eta_str'] = self.format_eta(s['eta'])
270 else:
271 s['_eta_str'] = 'Unknown ETA'
272
273 if s.get('total_bytes') and s.get('downloaded_bytes') is not None:
274 s['_percent_str'] = self.format_percent(100 * s['downloaded_bytes'] / s['total_bytes'])
275 elif s.get('total_bytes_estimate') and s.get('downloaded_bytes') is not None:
276 s['_percent_str'] = self.format_percent(100 * s['downloaded_bytes'] / s['total_bytes_estimate'])
277 else:
278 if s.get('downloaded_bytes') == 0:
279 s['_percent_str'] = self.format_percent(0)
280 else:
281 s['_percent_str'] = 'Unknown %'
282
283 if s.get('speed') is not None:
284 s['_speed_str'] = self.format_speed(s['speed'])
285 else:
286 s['_speed_str'] = 'Unknown speed'
287
288 if s.get('total_bytes') is not None:
289 s['_total_bytes_str'] = format_bytes(s['total_bytes'])
290 msg_template = '%(_percent_str)s of %(_total_bytes_str)s at %(_speed_str)s ETA %(_eta_str)s'
291 elif s.get('total_bytes_estimate') is not None:
292 s['_total_bytes_estimate_str'] = format_bytes(s['total_bytes_estimate'])
293 msg_template = '%(_percent_str)s of ~%(_total_bytes_estimate_str)s at %(_speed_str)s ETA %(_eta_str)s'
294 else:
295 if s.get('downloaded_bytes') is not None:
296 s['_downloaded_bytes_str'] = format_bytes(s['downloaded_bytes'])
297 if s.get('elapsed'):
298 s['_elapsed_str'] = self.format_seconds(s['elapsed'])
299 msg_template = '%(_downloaded_bytes_str)s at %(_speed_str)s (%(_elapsed_str)s)'
300 else:
301 msg_template = '%(_downloaded_bytes_str)s at %(_speed_str)s'
302 else:
303 msg_template = '%(_percent_str)s % at %(_speed_str)s ETA %(_eta_str)s'
304
305 self._report_progress_status(msg_template % s)
306
307 def report_resuming_byte(self, resume_len):
308 """Report attempt to resume at given byte."""
309 self.to_screen('[download] Resuming download at byte %s' % resume_len)
310
311 def report_retry(self, err, count, retries):
312 """Report retry in case of HTTP error 5xx"""
313 self.to_screen(
314 '[download] Got server HTTP error: %s. Retrying (attempt %d of %s)...'
315 % (error_to_compat_str(err), count, self.format_retries(retries)))
316
317 def report_file_already_downloaded(self, file_name):
318 """Report file has already been fully downloaded."""
319 try:
320 self.to_screen('[download] %s has already been downloaded' % file_name)
321 except UnicodeEncodeError:
322 self.to_screen('[download] The file has already been downloaded')
323
324 def report_unable_to_resume(self):
325 """Report it was impossible to resume download."""
326 self.to_screen('[download] Unable to resume')
327
328 def download(self, filename, info_dict):
329 """Download to a filename using the info from info_dict
330 Return True on success and False otherwise
331 """
332
333 nooverwrites_and_exists = (
334 self.params.get('nooverwrites', False) and
335 os.path.exists(encodeFilename(filename))
336 )
337
338 if not hasattr(filename, 'write'):
339 continuedl_and_exists = (
340 self.params.get('continuedl', True) and
341 os.path.isfile(encodeFilename(filename)) and
342 not self.params.get('nopart', False)
343 )
344
345 # Check file already present
346 if filename != '-' and (nooverwrites_and_exists or continuedl_and_exists):
347 self.report_file_already_downloaded(filename)
348 self._hook_progress({
349 'filename': filename,
350 'status': 'finished',
351 'total_bytes': os.path.getsize(encodeFilename(filename)),
352 })
353 return True
354
355 min_sleep_interval = self.params.get('sleep_interval')
356 if min_sleep_interval:
357 max_sleep_interval = self.params.get('max_sleep_interval', min_sleep_interval)
358 sleep_interval = random.uniform(min_sleep_interval, max_sleep_interval)
359 self.to_screen(
360 '[download] Sleeping %s seconds...' % (
361 int(sleep_interval) if sleep_interval.is_integer()
362 else '%.2f' % sleep_interval))
363 time.sleep(sleep_interval)
364
365 return self.real_download(filename, info_dict)
366
367 def real_download(self, filename, info_dict):
368 """Real download process. Redefine in subclasses."""
369 raise NotImplementedError('This method must be implemented by subclasses')
370
371 def _hook_progress(self, status):
372 for ph in self._progress_hooks:
373 ph(status)
374
375 def add_progress_hook(self, ph):
376 # See YoutubeDl.py (search for progress_hooks) for a description of
377 # this interface
378 self._progress_hooks.append(ph)
379
380 def _debug_cmd(self, args, exe=None):
381 if not self.params.get('verbose', False):
382 return
383
384 str_args = [decodeArgument(a) for a in args]
385
386 if exe is None:
387 exe = os.path.basename(str_args[0])
388
389 self.to_screen('[debug] %s command line: %s' % (
390 exe, shell_quote(str_args)))