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

   1 from __future__ import unicode_literals
   2
   3 import os.path
   4 import subprocess
   5 import sys
   6
   7 from .common import FileDownloader
   8 from ..utils import (
   9     encodeFilename,
  10 )
  11
  12
  13 class ExternalFD(FileDownloader):
  14     def real_download(self, filename, info_dict):
  15         self.report_destination(filename)
  16         tmpfilename = self.temp_name(filename)
  17
  18         retval = self._call_downloader(tmpfilename, info_dict)
  19         if retval == 0:
  20             fsize = os.path.getsize(encodeFilename(tmpfilename))
  21             self.to_screen('\r[%s] Downloaded %s bytes' % (self.get_basename(), fsize))
  22             self.try_rename(tmpfilename, filename)
  23             self._hook_progress({
  24                 'downloaded_bytes': fsize,
  25                 'total_bytes': fsize,
  26                 'filename': filename,
  27                 'status': 'finished',
  28             })
  29             return True
  30         else:
  31             self.to_stderr('\n')
  32             self.report_error('%s exited with code %d' % (
  33                 self.get_basename(), retval))
  34             return False
  35
  36     @classmethod
  37     def get_basename(cls):
  38         return cls.__name__[:-2].lower()
  39
  40     @property
  41     def exe(self):
  42         return self.params.get('external_downloader')
  43
  44     @classmethod
  45     def supports(cls, info_dict):
  46         return info_dict['protocol'] in ('http', 'https', 'ftp', 'ftps')
  47
  48     def _source_address(self, command_option):
  49         source_address = self.params.get('source_address')
  50         if source_address is None:
  51             return []
  52         return [command_option, source_address]
  53
  54     def _configuration_args(self, default=[]):
  55         ex_args = self.params.get('external_downloader_args')
  56         if ex_args is None:
  57             return default
  58         assert isinstance(ex_args, list)
  59         return ex_args
  60
  61     def _call_downloader(self, tmpfilename, info_dict):
  62         """ Either overwrite this or implement _make_cmd """
  63         cmd = self._make_cmd(tmpfilename, info_dict)
  64
  65         if sys.platform == 'win32' and sys.version_info < (3, 0):
  66             # Windows subprocess module does not actually support Unicode
  67             # on Python 2.x
  68             # See http://stackoverflow.com/a/9951851/35070
  69             subprocess_encoding = sys.getfilesystemencoding()
  70             cmd = [a.encode(subprocess_encoding, 'ignore') for a in cmd]
  71         else:
  72             subprocess_encoding = None
  73         self._debug_cmd(cmd, subprocess_encoding)
  74
  75         p = subprocess.Popen(
  76             cmd, stderr=subprocess.PIPE)
  77         _, stderr = p.communicate()
  78         if p.returncode != 0:
  79             self.to_stderr(stderr)
  80         return p.returncode
  81
  82
  83 class CurlFD(ExternalFD):
  84     def _make_cmd(self, tmpfilename, info_dict):
  85         cmd = [self.exe, '--location', '-o', tmpfilename]
  86         for key, val in info_dict['http_headers'].items():
  87             cmd += ['--header', '%s: %s' % (key, val)]
  88         cmd += self._source_address('--interface')
  89         cmd += self._configuration_args()
  90         cmd += ['--', info_dict['url']]
  91         return cmd
  92
  93
  94 class WgetFD(ExternalFD):
  95     def _make_cmd(self, tmpfilename, info_dict):
  96         cmd = [self.exe, '-O', tmpfilename, '-nv', '--no-cookies']
  97         for key, val in info_dict['http_headers'].items():
  98             cmd += ['--header', '%s: %s' % (key, val)]
  99         cmd += self._source_address('--bind-address')
 100         cmd += self._configuration_args()
 101         cmd += ['--', info_dict['url']]
 102         return cmd
 103
 104
 105 class Aria2cFD(ExternalFD):
 106     def _make_cmd(self, tmpfilename, info_dict):
 107         cmd = [self.exe, '-c']
 108         cmd += self._configuration_args([
 109             '--min-split-size', '1M', '--max-connection-per-server', '4'])
 110         dn = os.path.dirname(tmpfilename)
 111         if dn:
 112             cmd += ['--dir', dn]
 113         cmd += ['--out', os.path.basename(tmpfilename)]
 114         for key, val in info_dict['http_headers'].items():
 115             cmd += ['--header', '%s: %s' % (key, val)]
 116         cmd += self._source_address('--interface')
 117         cmd += ['--', info_dict['url']]
 118         return cmd
 119
 120 _BY_NAME = dict(
 121     (klass.get_basename(), klass)
 122     for name, klass in globals().items()
 123     if name.endswith('FD') and name != 'ExternalFD'
 124 )
 125
 126
 127 def list_external_downloaders():
 128     return sorted(_BY_NAME.keys())
 129
 130
 131 def get_external_downloader(external_downloader):
 132     """ Given the name of the executable, see whether we support the given
 133         downloader . """
 134     bn = os.path.basename(external_downloader)
 135     return _BY_NAME[bn]