Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/FileDownloader.py

   1 import math
   2 import os
   3 import re
   4 import subprocess
   5 import sys
   6 import time
   7 import traceback
   8
   9 if os.name == 'nt':
  10     import ctypes
  11
  12 from .utils import *
  13
  14
  15 class FileDownloader(object):
  16     """File Downloader class.
  17
  18     File downloader objects are the ones responsible of downloading the
  19     actual video file and writing it to disk.
  20
  21     File downloaders accept a lot of parameters. In order not to saturate
  22     the object constructor with arguments, it receives a dictionary of
  23     options instead.
  24
  25     Available options:
  26
  27     verbose:           Print additional info to stdout.
  28     quiet:             Do not print messages to stdout.
  29     ratelimit:         Download speed limit, in bytes/sec.
  30     retries:           Number of times to retry for HTTP error 5xx
  31     buffersize:        Size of download buffer in bytes.
  32     noresizebuffer:    Do not automatically resize the download buffer.
  33     continuedl:        Try to continue downloads if possible.
  34     noprogress:        Do not print the progress bar.
  35     logtostderr:       Log messages to stderr instead of stdout.
  36     consoletitle:      Display progress in console window's titlebar.
  37     nopart:            Do not use temporary .part files.
  38     updatetime:        Use the Last-modified header to set output file timestamps.
  39     test:              Download only first bytes to test the downloader.
  40     min_filesize:      Skip files smaller than this size
  41     max_filesize:      Skip files larger than this size
  42     """
  43
  44     params = None
  45
  46     def __init__(self, ydl, params):
  47         """Create a FileDownloader object with the given options."""
  48         self.ydl = ydl
  49         self._progress_hooks = []
  50         self.params = params
  51
  52     @staticmethod
  53     def format_bytes(bytes):
  54         if bytes is None:
  55             return 'N/A'
  56         if type(bytes) is str:
  57             bytes = float(bytes)
  58         if bytes == 0.0:
  59             exponent = 0
  60         else:
  61             exponent = int(math.log(bytes, 1024.0))
  62         suffix = ['B','KiB','MiB','GiB','TiB','PiB','EiB','ZiB','YiB'][exponent]
  63         converted = float(bytes) / float(1024 ** exponent)
  64         return '%.2f%s' % (converted, suffix)
  65
  66     @staticmethod
  67     def calc_percent(byte_counter, data_len):
  68         if data_len is None:
  69             return '---.-%'
  70         return '%6s' % ('%3.1f%%' % (float(byte_counter) / float(data_len) * 100.0))
  71
  72     @staticmethod
  73     def calc_eta(start, now, total, current):
  74         if total is None:
  75             return '--:--'
  76         dif = now - start
  77         if current == 0 or dif < 0.001: # One millisecond
  78             return '--:--'
  79         rate = float(current) / dif
  80         eta = int((float(total) - float(current)) / rate)
  81         (eta_mins, eta_secs) = divmod(eta, 60)
  82         if eta_mins > 99:
  83             return '--:--'
  84         return '%02d:%02d' % (eta_mins, eta_secs)
  85
  86     @staticmethod
  87     def calc_speed(start, now, bytes):
  88         dif = now - start
  89         if bytes == 0 or dif < 0.001: # One millisecond
  90             return '%10s' % '---b/s'
  91         return '%10s' % ('%s/s' % FileDownloader.format_bytes(float(bytes) / dif))
  92
  93     @staticmethod
  94     def best_block_size(elapsed_time, bytes):
  95         new_min = max(bytes / 2.0, 1.0)
  96         new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
  97         if elapsed_time < 0.001:
  98             return int(new_max)
  99         rate = bytes / elapsed_time
 100         if rate > new_max:
 101             return int(new_max)
 102         if rate < new_min:
 103             return int(new_min)
 104         return int(rate)
 105
 106     @staticmethod
 107     def parse_bytes(bytestr):
 108         """Parse a string indicating a byte quantity into an integer."""
 109         matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
 110         if matchobj is None:
 111             return None
 112         number = float(matchobj.group(1))
 113         multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
 114         return int(round(number * multiplier))
 115
 116     def to_screen(self, *args, **kargs):
 117         self.ydl.to_screen(*args, **kargs)
 118
 119     def to_stderr(self, message):
 120         self.ydl.to_screen(message)
 121
 122     def to_cons_title(self, message):
 123         """Set console/terminal window title to message."""
 124         if not self.params.get('consoletitle', False):
 125             return
 126         if os.name == 'nt' and ctypes.windll.kernel32.GetConsoleWindow():
 127             # c_wchar_p() might not be necessary if `message` is
 128             # already of type unicode()
 129             ctypes.windll.kernel32.SetConsoleTitleW(ctypes.c_wchar_p(message))
 130         elif 'TERM' in os.environ:
 131             self.to_screen('\033]0;%s\007' % message, skip_eol=True)
 132
 133     def trouble(self, *args, **kargs):
 134         self.ydl.trouble(*args, **kargs)
 135
 136     def report_warning(self, *args, **kargs):
 137         self.ydl.report_warning(*args, **kargs)
 138
 139     def report_error(self, *args, **kargs):
 140         self.ydl.error(*args, **kargs)
 141
 142     def slow_down(self, start_time, byte_counter):
 143         """Sleep if the download speed is over the rate limit."""
 144         rate_limit = self.params.get('ratelimit', None)
 145         if rate_limit is None or byte_counter == 0:
 146             return
 147         now = time.time()
 148         elapsed = now - start_time
 149         if elapsed <= 0.0:
 150             return
 151         speed = float(byte_counter) / elapsed
 152         if speed > rate_limit:
 153             time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
 154
 155     def temp_name(self, filename):
 156         """Returns a temporary filename for the given filename."""
 157         if self.params.get('nopart', False) or filename == u'-' or \
 158                 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
 159             return filename
 160         return filename + u'.part'
 161
 162     def undo_temp_name(self, filename):
 163         if filename.endswith(u'.part'):
 164             return filename[:-len(u'.part')]
 165         return filename
 166
 167     def try_rename(self, old_filename, new_filename):
 168         try:
 169             if old_filename == new_filename:
 170                 return
 171             os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
 172         except (IOError, OSError) as err:
 173             self.report_error(u'unable to rename file')
 174
 175     def try_utime(self, filename, last_modified_hdr):
 176         """Try to set the last-modified time of the given file."""
 177         if last_modified_hdr is None:
 178             return
 179         if not os.path.isfile(encodeFilename(filename)):
 180             return
 181         timestr = last_modified_hdr
 182         if timestr is None:
 183             return
 184         filetime = timeconvert(timestr)
 185         if filetime is None:
 186             return filetime
 187         # Ignore obviously invalid dates
 188         if filetime == 0:
 189             return
 190         try:
 191             os.utime(filename, (time.time(), filetime))
 192         except:
 193             pass
 194         return filetime
 195
 196     def report_destination(self, filename):
 197         """Report destination filename."""
 198         self.to_screen(u'[download] Destination: ' + filename)
 199
 200     def report_progress(self, percent_str, data_len_str, speed_str, eta_str):
 201         """Report download progress."""
 202         if self.params.get('noprogress', False):
 203             return
 204         clear_line = (u'\x1b[K' if sys.stderr.isatty() and os.name != 'nt' else u'')
 205         if self.params.get('progress_with_newline', False):
 206             self.to_screen(u'[download] %s of %s at %s ETA %s' %
 207                 (percent_str, data_len_str, speed_str, eta_str))
 208         else:
 209             self.to_screen(u'\r%s[download] %s of %s at %s ETA %s' %
 210                 (clear_line, percent_str, data_len_str, speed_str, eta_str), skip_eol=True)
 211         self.to_cons_title(u'youtube-dl - %s of %s at %s ETA %s' %
 212                 (percent_str.strip(), data_len_str.strip(), speed_str.strip(), eta_str.strip()))
 213
 214     def report_resuming_byte(self, resume_len):
 215         """Report attempt to resume at given byte."""
 216         self.to_screen(u'[download] Resuming download at byte %s' % resume_len)
 217
 218     def report_retry(self, count, retries):
 219         """Report retry in case of HTTP error 5xx"""
 220         self.to_screen(u'[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
 221
 222     def report_file_already_downloaded(self, file_name):
 223         """Report file has already been fully downloaded."""
 224         try:
 225             self.to_screen(u'[download] %s has already been downloaded' % file_name)
 226         except (UnicodeEncodeError) as err:
 227             self.to_screen(u'[download] The file has already been downloaded')
 228
 229     def report_unable_to_resume(self):
 230         """Report it was impossible to resume download."""
 231         self.to_screen(u'[download] Unable to resume')
 232
 233     def report_finish(self):
 234         """Report download finished."""
 235         if self.params.get('noprogress', False):
 236             self.to_screen(u'[download] Download completed')
 237         else:
 238             self.to_screen(u'')
 239
 240     def _download_with_rtmpdump(self, filename, url, player_url, page_url, play_path, tc_url):
 241         self.report_destination(filename)
 242         tmpfilename = self.temp_name(filename)
 243
 244         # Check for rtmpdump first
 245         try:
 246             subprocess.call(['rtmpdump', '-h'], stdout=(open(os.path.devnull, 'w')), stderr=subprocess.STDOUT)
 247         except (OSError, IOError):
 248             self.report_error(u'RTMP download detected but "rtmpdump" could not be run')
 249             return False
 250         verbosity_option = '--verbose' if self.params.get('verbose', False) else '--quiet'
 251
 252         # Download using rtmpdump. rtmpdump returns exit code 2 when
 253         # the connection was interrumpted and resuming appears to be
 254         # possible. This is part of rtmpdump's normal usage, AFAIK.
 255         basic_args = ['rtmpdump', verbosity_option, '-r', url, '-o', tmpfilename]
 256         if player_url is not None:
 257             basic_args += ['--swfVfy', player_url]
 258         if page_url is not None:
 259             basic_args += ['--pageUrl', page_url]
 260         if play_path is not None:
 261             basic_args += ['--playpath', play_path]
 262         if tc_url is not None:
 263             basic_args += ['--tcUrl', url]
 264         args = basic_args + [[], ['--resume', '--skip', '1']][self.params.get('continuedl', False)]
 265         if self.params.get('verbose', False):
 266             try:
 267                 import pipes
 268                 shell_quote = lambda args: ' '.join(map(pipes.quote, args))
 269             except ImportError:
 270                 shell_quote = repr
 271             self.to_screen(u'[debug] rtmpdump command line: ' + shell_quote(args))
 272         retval = subprocess.call(args)
 273         while retval == 2 or retval == 1:
 274             prevsize = os.path.getsize(encodeFilename(tmpfilename))
 275             self.to_screen(u'\r[rtmpdump] %s bytes' % prevsize, skip_eol=True)
 276             time.sleep(5.0) # This seems to be needed
 277             retval = subprocess.call(basic_args + ['-e'] + [[], ['-k', '1']][retval == 1])
 278             cursize = os.path.getsize(encodeFilename(tmpfilename))
 279             if prevsize == cursize and retval == 1:
 280                 break
 281              # Some rtmp streams seem abort after ~ 99.8%. Don't complain for those
 282             if prevsize == cursize and retval == 2 and cursize > 1024:
 283                 self.to_screen(u'\r[rtmpdump] Could not download the whole video. This can happen for some advertisements.')
 284                 retval = 0
 285                 break
 286         if retval == 0:
 287             fsize = os.path.getsize(encodeFilename(tmpfilename))
 288             self.to_screen(u'\r[rtmpdump] %s bytes' % fsize)
 289             self.try_rename(tmpfilename, filename)
 290             self._hook_progress({
 291                 'downloaded_bytes': fsize,
 292                 'total_bytes': fsize,
 293                 'filename': filename,
 294                 'status': 'finished',
 295             })
 296             return True
 297         else:
 298             self.to_stderr(u"\n")
 299             self.report_error(u'rtmpdump exited with code %d' % retval)
 300             return False
 301
 302     def _download_with_mplayer(self, filename, url):
 303         self.report_destination(filename)
 304         tmpfilename = self.temp_name(filename)
 305
 306         args = ['mplayer', '-really-quiet', '-vo', 'null', '-vc', 'dummy', '-dumpstream', '-dumpfile', tmpfilename, url]
 307         # Check for mplayer first
 308         try:
 309             subprocess.call(['mplayer', '-h'], stdout=(open(os.path.devnull, 'w')), stderr=subprocess.STDOUT)
 310         except (OSError, IOError):
 311             self.report_error(u'MMS or RTSP download detected but "%s" could not be run' % args[0] )
 312             return False
 313
 314         # Download using mplayer.
 315         retval = subprocess.call(args)
 316         if retval == 0:
 317             fsize = os.path.getsize(encodeFilename(tmpfilename))
 318             self.to_screen(u'\r[%s] %s bytes' % (args[0], fsize))
 319             self.try_rename(tmpfilename, filename)
 320             self._hook_progress({
 321                 'downloaded_bytes': fsize,
 322                 'total_bytes': fsize,
 323                 'filename': filename,
 324                 'status': 'finished',
 325             })
 326             return True
 327         else:
 328             self.to_stderr(u"\n")
 329             self.report_error(u'mplayer exited with code %d' % retval)
 330             return False
 331
 332
 333     def _do_download(self, filename, info_dict):
 334         url = info_dict['url']
 335
 336         # Check file already present
 337         if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
 338             self.report_file_already_downloaded(filename)
 339             self._hook_progress({
 340                 'filename': filename,
 341                 'status': 'finished',
 342             })
 343             return True
 344
 345         # Attempt to download using rtmpdump
 346         if url.startswith('rtmp'):
 347             return self._download_with_rtmpdump(filename, url,
 348                                                 info_dict.get('player_url', None),
 349                                                 info_dict.get('page_url', None),
 350                                                 info_dict.get('play_path', None),
 351                                                 info_dict.get('tc_url', None))
 352
 353         # Attempt to download using mplayer
 354         if url.startswith('mms') or url.startswith('rtsp'):
 355             return self._download_with_mplayer(filename, url)
 356
 357         tmpfilename = self.temp_name(filename)
 358         stream = None
 359
 360         # Do not include the Accept-Encoding header
 361         headers = {'Youtubedl-no-compression': 'True'}
 362         if 'user_agent' in info_dict:
 363             headers['Youtubedl-user-agent'] = info_dict['user_agent']
 364         basic_request = compat_urllib_request.Request(url, None, headers)
 365         request = compat_urllib_request.Request(url, None, headers)
 366
 367         if self.params.get('test', False):
 368             request.add_header('Range','bytes=0-10240')
 369
 370         # Establish possible resume length
 371         if os.path.isfile(encodeFilename(tmpfilename)):
 372             resume_len = os.path.getsize(encodeFilename(tmpfilename))
 373         else:
 374             resume_len = 0
 375
 376         open_mode = 'wb'
 377         if resume_len != 0:
 378             if self.params.get('continuedl', False):
 379                 self.report_resuming_byte(resume_len)
 380                 request.add_header('Range','bytes=%d-' % resume_len)
 381                 open_mode = 'ab'
 382             else:
 383                 resume_len = 0
 384
 385         count = 0
 386         retries = self.params.get('retries', 0)
 387         while count <= retries:
 388             # Establish connection
 389             try:
 390                 if count == 0 and 'urlhandle' in info_dict:
 391                     data = info_dict['urlhandle']
 392                 data = compat_urllib_request.urlopen(request)
 393                 break
 394             except (compat_urllib_error.HTTPError, ) as err:
 395                 if (err.code < 500 or err.code >= 600) and err.code != 416:
 396                     # Unexpected HTTP error
 397                     raise
 398                 elif err.code == 416:
 399                     # Unable to resume (requested range not satisfiable)
 400                     try:
 401                         # Open the connection again without the range header
 402                         data = compat_urllib_request.urlopen(basic_request)
 403                         content_length = data.info()['Content-Length']
 404                     except (compat_urllib_error.HTTPError, ) as err:
 405                         if err.code < 500 or err.code >= 600:
 406                             raise
 407                     else:
 408                         # Examine the reported length
 409                         if (content_length is not None and
 410                                 (resume_len - 100 < int(content_length) < resume_len + 100)):
 411                             # The file had already been fully downloaded.
 412                             # Explanation to the above condition: in issue #175 it was revealed that
 413                             # YouTube sometimes adds or removes a few bytes from the end of the file,
 414                             # changing the file size slightly and causing problems for some users. So
 415                             # I decided to implement a suggested change and consider the file
 416                             # completely downloaded if the file size differs less than 100 bytes from
 417                             # the one in the hard drive.
 418                             self.report_file_already_downloaded(filename)
 419                             self.try_rename(tmpfilename, filename)
 420                             self._hook_progress({
 421                                 'filename': filename,
 422                                 'status': 'finished',
 423                             })
 424                             return True
 425                         else:
 426                             # The length does not match, we start the download over
 427                             self.report_unable_to_resume()
 428                             open_mode = 'wb'
 429                             break
 430             # Retry
 431             count += 1
 432             if count <= retries:
 433                 self.report_retry(count, retries)
 434
 435         if count > retries:
 436             self.report_error(u'giving up after %s retries' % retries)
 437             return False
 438
 439         data_len = data.info().get('Content-length', None)
 440         if data_len is not None:
 441             data_len = int(data_len) + resume_len
 442             min_data_len = self.params.get("min_filesize", None)
 443             max_data_len =  self.params.get("max_filesize", None)
 444             if min_data_len is not None and data_len < min_data_len:
 445                 self.to_screen(u'\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
 446                 return False
 447             if max_data_len is not None and data_len > max_data_len:
 448                 self.to_screen(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
 449                 return False
 450
 451         data_len_str = self.format_bytes(data_len)
 452         byte_counter = 0 + resume_len
 453         block_size = self.params.get('buffersize', 1024)
 454         start = time.time()
 455         while True:
 456             # Download and write
 457             before = time.time()
 458             data_block = data.read(block_size)
 459             after = time.time()
 460             if len(data_block) == 0:
 461                 break
 462             byte_counter += len(data_block)
 463
 464             # Open file just in time
 465             if stream is None:
 466                 try:
 467                     (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
 468                     assert stream is not None
 469                     filename = self.undo_temp_name(tmpfilename)
 470                     self.report_destination(filename)
 471                 except (OSError, IOError) as err:
 472                     self.report_error(u'unable to open for writing: %s' % str(err))
 473                     return False
 474             try:
 475                 stream.write(data_block)
 476             except (IOError, OSError) as err:
 477                 self.to_stderr(u"\n")
 478                 self.report_error(u'unable to write data: %s' % str(err))
 479                 return False
 480             if not self.params.get('noresizebuffer', False):
 481                 block_size = self.best_block_size(after - before, len(data_block))
 482
 483             # Progress message
 484             speed_str = self.calc_speed(start, time.time(), byte_counter - resume_len)
 485             if data_len is None:
 486                 self.report_progress('Unknown %', data_len_str, speed_str, 'Unknown ETA')
 487             else:
 488                 percent_str = self.calc_percent(byte_counter, data_len)
 489                 eta_str = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
 490                 self.report_progress(percent_str, data_len_str, speed_str, eta_str)
 491
 492             self._hook_progress({
 493                 'downloaded_bytes': byte_counter,
 494                 'total_bytes': data_len,
 495                 'tmpfilename': tmpfilename,
 496                 'filename': filename,
 497                 'status': 'downloading',
 498             })
 499
 500             # Apply rate limit
 501             self.slow_down(start, byte_counter - resume_len)
 502
 503         if stream is None:
 504             self.to_stderr(u"\n")
 505             self.report_error(u'Did not get any data blocks')
 506             return False
 507         stream.close()
 508         self.report_finish()
 509         if data_len is not None and byte_counter != data_len:
 510             raise ContentTooShortError(byte_counter, int(data_len))
 511         self.try_rename(tmpfilename, filename)
 512
 513         # Update file modification time
 514         if self.params.get('updatetime', True):
 515             info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
 516
 517         self._hook_progress({
 518             'downloaded_bytes': byte_counter,
 519             'total_bytes': byte_counter,
 520             'filename': filename,
 521             'status': 'finished',
 522         })
 523
 524         return True
 525
 526     def _hook_progress(self, status):
 527         for ph in self._progress_hooks:
 528             ph(status)
 529
 530     def add_progress_hook(self, ph):
 531         """ ph gets called on download progress, with a dictionary with the entries
 532         * filename: The final filename
 533         * status: One of "downloading" and "finished"
 534
 535         It can also have some of the following entries:
 536
 537         * downloaded_bytes: Bytes on disks
 538         * total_bytes: Total bytes, None if unknown
 539         * tmpfilename: The filename we're currently writing to
 540
 541         Hooks are guaranteed to be called at least once (with status "finished")
 542         if the download is successful.
 543         """
 544         self._progress_hooks.append(ph)