Raphaël G. Git Repositories - youtubedl/blob - youtube_dl/downloader/http.py

   1 from __future__ import unicode_literals
   2
   3 import errno
   4 import os
   5 import socket
   6 import time
   7 import re
   8
   9 from .common import FileDownloader
  10 from ..compat import compat_urllib_error
  11 from ..utils import (
  12     ContentTooShortError,
  13     encodeFilename,
  14     sanitize_open,
  15     sanitized_Request,
  16 )
  17
  18
  19 class HttpFD(FileDownloader):
  20     def real_download(self, filename, info_dict):
  21         url = info_dict['url']
  22         tmpfilename = self.temp_name(filename)
  23         stream = None
  24
  25         # Do not include the Accept-Encoding header
  26         headers = {'Youtubedl-no-compression': 'True'}
  27         add_headers = info_dict.get('http_headers')
  28         if add_headers:
  29             headers.update(add_headers)
  30         basic_request = sanitized_Request(url, None, headers)
  31         request = sanitized_Request(url, None, headers)
  32
  33         is_test = self.params.get('test', False)
  34
  35         if is_test:
  36             request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))
  37
  38         # Establish possible resume length
  39         if os.path.isfile(encodeFilename(tmpfilename)):
  40             resume_len = os.path.getsize(encodeFilename(tmpfilename))
  41         else:
  42             resume_len = 0
  43
  44         open_mode = 'wb'
  45         if resume_len != 0:
  46             if self.params.get('continuedl', True):
  47                 self.report_resuming_byte(resume_len)
  48                 request.add_header('Range', 'bytes=%d-' % resume_len)
  49                 open_mode = 'ab'
  50             else:
  51                 resume_len = 0
  52
  53         count = 0
  54         retries = self.params.get('retries', 0)
  55         while count <= retries:
  56             # Establish connection
  57             try:
  58                 data = self.ydl.urlopen(request)
  59                 # When trying to resume, Content-Range HTTP header of response has to be checked
  60                 # to match the value of requested Range HTTP header. This is due to a webservers
  61                 # that don't support resuming and serve a whole file with no Content-Range
  62                 # set in response despite of requested Range (see
  63                 # https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
  64                 if resume_len > 0:
  65                     content_range = data.headers.get('Content-Range')
  66                     if content_range:
  67                         content_range_m = re.search(r'bytes (\d+)-', content_range)
  68                         # Content-Range is present and matches requested Range, resume is possible
  69                         if content_range_m and resume_len == int(content_range_m.group(1)):
  70                             break
  71                     # Content-Range is either not present or invalid. Assuming remote webserver is
  72                     # trying to send the whole file, resume is not possible, so wiping the local file
  73                     # and performing entire redownload
  74                     self.report_unable_to_resume()
  75                     resume_len = 0
  76                     open_mode = 'wb'
  77                 break
  78             except (compat_urllib_error.HTTPError, ) as err:
  79                 if (err.code < 500 or err.code >= 600) and err.code != 416:
  80                     # Unexpected HTTP error
  81                     raise
  82                 elif err.code == 416:
  83                     # Unable to resume (requested range not satisfiable)
  84                     try:
  85                         # Open the connection again without the range header
  86                         data = self.ydl.urlopen(basic_request)
  87                         content_length = data.info()['Content-Length']
  88                     except (compat_urllib_error.HTTPError, ) as err:
  89                         if err.code < 500 or err.code >= 600:
  90                             raise
  91                     else:
  92                         # Examine the reported length
  93                         if (content_length is not None and
  94                                 (resume_len - 100 < int(content_length) < resume_len + 100)):
  95                             # The file had already been fully downloaded.
  96                             # Explanation to the above condition: in issue #175 it was revealed that
  97                             # YouTube sometimes adds or removes a few bytes from the end of the file,
  98                             # changing the file size slightly and causing problems for some users. So
  99                             # I decided to implement a suggested change and consider the file
 100                             # completely downloaded if the file size differs less than 100 bytes from
 101                             # the one in the hard drive.
 102                             self.report_file_already_downloaded(filename)
 103                             self.try_rename(tmpfilename, filename)
 104                             self._hook_progress({
 105                                 'filename': filename,
 106                                 'status': 'finished',
 107                                 'downloaded_bytes': resume_len,
 108                                 'total_bytes': resume_len,
 109                             })
 110                             return True
 111                         else:
 112                             # The length does not match, we start the download over
 113                             self.report_unable_to_resume()
 114                             resume_len = 0
 115                             open_mode = 'wb'
 116                             break
 117             except socket.error as e:
 118                 if e.errno != errno.ECONNRESET:
 119                     # Connection reset is no problem, just retry
 120                     raise
 121
 122             # Retry
 123             count += 1
 124             if count <= retries:
 125                 self.report_retry(count, retries)
 126
 127         if count > retries:
 128             self.report_error('giving up after %s retries' % retries)
 129             return False
 130
 131         data_len = data.info().get('Content-length', None)
 132
 133         # Range HTTP header may be ignored/unsupported by a webserver
 134         # (e.g. extractor/scivee.py, extractor/bambuser.py).
 135         # However, for a test we still would like to download just a piece of a file.
 136         # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
 137         # block size when downloading a file.
 138         if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
 139             data_len = self._TEST_FILE_SIZE
 140
 141         if data_len is not None:
 142             data_len = int(data_len) + resume_len
 143             min_data_len = self.params.get('min_filesize')
 144             max_data_len = self.params.get('max_filesize')
 145             if min_data_len is not None and data_len < min_data_len:
 146                 self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
 147                 return False
 148             if max_data_len is not None and data_len > max_data_len:
 149                 self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
 150                 return False
 151
 152         byte_counter = 0 + resume_len
 153         block_size = self.params.get('buffersize', 1024)
 154         start = time.time()
 155
 156         # measure time over whole while-loop, so slow_down() and best_block_size() work together properly
 157         now = None  # needed for slow_down() in the first loop run
 158         before = start  # start measuring
 159         while True:
 160
 161             # Download and write
 162             data_block = data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
 163             byte_counter += len(data_block)
 164
 165             # exit loop when download is finished
 166             if len(data_block) == 0:
 167                 break
 168
 169             # Open destination file just in time
 170             if stream is None:
 171                 try:
 172                     (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
 173                     assert stream is not None
 174                     filename = self.undo_temp_name(tmpfilename)
 175                     self.report_destination(filename)
 176                 except (OSError, IOError) as err:
 177                     self.report_error('unable to open for writing: %s' % str(err))
 178                     return False
 179
 180                 if self.params.get('xattr_set_filesize', False) and data_len is not None:
 181                     try:
 182                         import xattr
 183                         xattr.setxattr(tmpfilename, 'user.ytdl.filesize', str(data_len))
 184                     except(OSError, IOError, ImportError) as err:
 185                         self.report_error('unable to set filesize xattr: %s' % str(err))
 186
 187             try:
 188                 stream.write(data_block)
 189             except (IOError, OSError) as err:
 190                 self.to_stderr('\n')
 191                 self.report_error('unable to write data: %s' % str(err))
 192                 return False
 193
 194             # Apply rate limit
 195             self.slow_down(start, now, byte_counter - resume_len)
 196
 197             # end measuring of one loop run
 198             now = time.time()
 199             after = now
 200
 201             # Adjust block size
 202             if not self.params.get('noresizebuffer', False):
 203                 block_size = self.best_block_size(after - before, len(data_block))
 204
 205             before = after
 206
 207             # Progress message
 208             speed = self.calc_speed(start, now, byte_counter - resume_len)
 209             if data_len is None:
 210                 eta = None
 211             else:
 212                 eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
 213
 214             self._hook_progress({
 215                 'status': 'downloading',
 216                 'downloaded_bytes': byte_counter,
 217                 'total_bytes': data_len,
 218                 'tmpfilename': tmpfilename,
 219                 'filename': filename,
 220                 'eta': eta,
 221                 'speed': speed,
 222                 'elapsed': now - start,
 223             })
 224
 225             if is_test and byte_counter == data_len:
 226                 break
 227
 228         if stream is None:
 229             self.to_stderr('\n')
 230             self.report_error('Did not get any data blocks')
 231             return False
 232         if tmpfilename != '-':
 233             stream.close()
 234
 235         if data_len is not None and byte_counter != data_len:
 236             raise ContentTooShortError(byte_counter, int(data_len))
 237         self.try_rename(tmpfilename, filename)
 238
 239         # Update file modification time
 240         if self.params.get('updatetime', True):
 241             info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
 242
 243         self._hook_progress({
 244             'downloaded_bytes': byte_counter,
 245             'total_bytes': byte_counter,
 246             'filename': filename,
 247             'status': 'finished',
 248             'elapsed': time.time() - start,
 249         })
 250
 251         return True