_ Git - youtube-dl/blob - youtube_dl/downloader/http.py

   1 import os
   2 import re
   3 import subprocess
   4 import sys
   5 import time
   6
   7 from .common import FileDownloader
   8 from ..utils import (
   9     compat_urllib_request,
  10     compat_urllib_error,
  11     ContentTooShortError,
  12
  13     encodeFilename,
  14     sanitize_open,
  15     format_bytes,
  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         if 'user_agent' in info_dict:
  28             headers['Youtubedl-user-agent'] = info_dict['user_agent']
  29         basic_request = compat_urllib_request.Request(url, None, headers)
  30         request = compat_urllib_request.Request(url, None, headers)
  31
  32         if self.params.get('test', False):
  33             request.add_header('Range','bytes=0-10240')
  34
  35         # Establish possible resume length
  36         if os.path.isfile(encodeFilename(tmpfilename)):
  37             resume_len = os.path.getsize(encodeFilename(tmpfilename))
  38         else:
  39             resume_len = 0
  40
  41         open_mode = 'wb'
  42         if resume_len != 0:
  43             if self.params.get('continuedl', False):
  44                 self.report_resuming_byte(resume_len)
  45                 request.add_header('Range','bytes=%d-' % resume_len)
  46                 open_mode = 'ab'
  47             else:
  48                 resume_len = 0
  49
  50         count = 0
  51         retries = self.params.get('retries', 0)
  52         while count <= retries:
  53             # Establish connection
  54             try:
  55                 if count == 0 and 'urlhandle' in info_dict:
  56                     data = info_dict['urlhandle']
  57                 data = compat_urllib_request.urlopen(request)
  58                 break
  59             except (compat_urllib_error.HTTPError, ) as err:
  60                 if (err.code < 500 or err.code >= 600) and err.code != 416:
  61                     # Unexpected HTTP error
  62                     raise
  63                 elif err.code == 416:
  64                     # Unable to resume (requested range not satisfiable)
  65                     try:
  66                         # Open the connection again without the range header
  67                         data = compat_urllib_request.urlopen(basic_request)
  68                         content_length = data.info()['Content-Length']
  69                     except (compat_urllib_error.HTTPError, ) as err:
  70                         if err.code < 500 or err.code >= 600:
  71                             raise
  72                     else:
  73                         # Examine the reported length
  74                         if (content_length is not None and
  75                                 (resume_len - 100 < int(content_length) < resume_len + 100)):
  76                             # The file had already been fully downloaded.
  77                             # Explanation to the above condition: in issue #175 it was revealed that
  78                             # YouTube sometimes adds or removes a few bytes from the end of the file,
  79                             # changing the file size slightly and causing problems for some users. So
  80                             # I decided to implement a suggested change and consider the file
  81                             # completely downloaded if the file size differs less than 100 bytes from
  82                             # the one in the hard drive.
  83                             self.report_file_already_downloaded(filename)
  84                             self.try_rename(tmpfilename, filename)
  85                             self._hook_progress({
  86                                 'filename': filename,
  87                                 'status': 'finished',
  88                             })
  89                             return True
  90                         else:
  91                             # The length does not match, we start the download over
  92                             self.report_unable_to_resume()
  93                             open_mode = 'wb'
  94                             break
  95             # Retry
  96             count += 1
  97             if count <= retries:
  98                 self.report_retry(count, retries)
  99
 100         if count > retries:
 101             self.report_error(u'giving up after %s retries' % retries)
 102             return False
 103
 104         data_len = data.info().get('Content-length', None)
 105         if data_len is not None:
 106             data_len = int(data_len) + resume_len
 107             min_data_len = self.params.get("min_filesize", None)
 108             max_data_len =  self.params.get("max_filesize", None)
 109             if min_data_len is not None and data_len < min_data_len:
 110                 self.to_screen(u'\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
 111                 return False
 112             if max_data_len is not None and data_len > max_data_len:
 113                 self.to_screen(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
 114                 return False
 115
 116         data_len_str = format_bytes(data_len)
 117         byte_counter = 0 + resume_len
 118         block_size = self.params.get('buffersize', 1024)
 119         start = time.time()
 120         while True:
 121             # Download and write
 122             before = time.time()
 123             data_block = data.read(block_size)
 124             after = time.time()
 125             if len(data_block) == 0:
 126                 break
 127             byte_counter += len(data_block)
 128
 129             # Open file just in time
 130             if stream is None:
 131                 try:
 132                     (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
 133                     assert stream is not None
 134                     filename = self.undo_temp_name(tmpfilename)
 135                     self.report_destination(filename)
 136                 except (OSError, IOError) as err:
 137                     self.report_error(u'unable to open for writing: %s' % str(err))
 138                     return False
 139             try:
 140                 stream.write(data_block)
 141             except (IOError, OSError):
 142                 self.to_stderr(u"\n")
 143                 self.report_error(u'unable to write data: %s' % str(err))
 144                 return False
 145             if not self.params.get('noresizebuffer', False):
 146                 block_size = self.best_block_size(after - before, len(data_block))
 147
 148             # Progress message
 149             speed = self.calc_speed(start, time.time(), byte_counter - resume_len)
 150             if data_len is None:
 151                 eta = percent = None
 152             else:
 153                 percent = self.calc_percent(byte_counter, data_len)
 154                 eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
 155             self.report_progress(percent, data_len_str, speed, eta)
 156
 157             self._hook_progress({
 158                 'downloaded_bytes': byte_counter,
 159                 'total_bytes': data_len,
 160                 'tmpfilename': tmpfilename,
 161                 'filename': filename,
 162                 'status': 'downloading',
 163                 'eta': eta,
 164                 'speed': speed,
 165             })
 166
 167             # Apply rate limit
 168             self.slow_down(start, byte_counter - resume_len)
 169
 170         if stream is None:
 171             self.to_stderr(u"\n")
 172             self.report_error(u'Did not get any data blocks')
 173             return False
 174         stream.close()
 175         self.report_finish(data_len_str, (time.time() - start))
 176         if data_len is not None and byte_counter != data_len:
 177             raise ContentTooShortError(byte_counter, int(data_len))
 178         self.try_rename(tmpfilename, filename)
 179
 180         # Update file modification time
 181         if self.params.get('updatetime', True):
 182             info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
 183
 184         self._hook_progress({
 185             'downloaded_bytes': byte_counter,
 186             'total_bytes': byte_counter,
 187             'filename': filename,
 188             'status': 'finished',
 189         })
 190
 191         return True