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[youtubedl] / 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 write_xattr,
17 XAttrMetadataError,
18 XAttrUnavailableError,
19 )
20
21
22 class HttpFD(FileDownloader):
23 def real_download(self, filename, info_dict):
24 url = info_dict['url']
25 tmpfilename = self.temp_name(filename)
26 stream = None
27
28 # Do not include the Accept-Encoding header
29 headers = {'Youtubedl-no-compression': 'True'}
30 add_headers = info_dict.get('http_headers')
31 if add_headers:
32 headers.update(add_headers)
33 basic_request = sanitized_Request(url, None, headers)
34 request = sanitized_Request(url, None, headers)
35
36 is_test = self.params.get('test', False)
37
38 if is_test:
39 request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))
40
41 # Establish possible resume length
42 if os.path.isfile(encodeFilename(tmpfilename)):
43 resume_len = os.path.getsize(encodeFilename(tmpfilename))
44 else:
45 resume_len = 0
46
47 open_mode = 'wb'
48 if resume_len != 0:
49 if self.params.get('continuedl', True):
50 self.report_resuming_byte(resume_len)
51 request.add_header('Range', 'bytes=%d-' % resume_len)
52 open_mode = 'ab'
53 else:
54 resume_len = 0
55
56 count = 0
57 retries = self.params.get('retries', 0)
58 while count <= retries:
59 # Establish connection
60 try:
61 data = self.ydl.urlopen(request)
62 # When trying to resume, Content-Range HTTP header of response has to be checked
63 # to match the value of requested Range HTTP header. This is due to a webservers
64 # that don't support resuming and serve a whole file with no Content-Range
65 # set in response despite of requested Range (see
66 # https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
67 if resume_len > 0:
68 content_range = data.headers.get('Content-Range')
69 if content_range:
70 content_range_m = re.search(r'bytes (\d+)-', content_range)
71 # Content-Range is present and matches requested Range, resume is possible
72 if content_range_m and resume_len == int(content_range_m.group(1)):
73 break
74 # Content-Range is either not present or invalid. Assuming remote webserver is
75 # trying to send the whole file, resume is not possible, so wiping the local file
76 # and performing entire redownload
77 self.report_unable_to_resume()
78 resume_len = 0
79 open_mode = 'wb'
80 break
81 except (compat_urllib_error.HTTPError, ) as err:
82 if (err.code < 500 or err.code >= 600) and err.code != 416:
83 # Unexpected HTTP error
84 raise
85 elif err.code == 416:
86 # Unable to resume (requested range not satisfiable)
87 try:
88 # Open the connection again without the range header
89 data = self.ydl.urlopen(basic_request)
90 content_length = data.info()['Content-Length']
91 except (compat_urllib_error.HTTPError, ) as err:
92 if err.code < 500 or err.code >= 600:
93 raise
94 else:
95 # Examine the reported length
96 if (content_length is not None and
97 (resume_len - 100 < int(content_length) < resume_len + 100)):
98 # The file had already been fully downloaded.
99 # Explanation to the above condition: in issue #175 it was revealed that
100 # YouTube sometimes adds or removes a few bytes from the end of the file,
101 # changing the file size slightly and causing problems for some users. So
102 # I decided to implement a suggested change and consider the file
103 # completely downloaded if the file size differs less than 100 bytes from
104 # the one in the hard drive.
105 self.report_file_already_downloaded(filename)
106 self.try_rename(tmpfilename, filename)
107 self._hook_progress({
108 'filename': filename,
109 'status': 'finished',
110 'downloaded_bytes': resume_len,
111 'total_bytes': resume_len,
112 })
113 return True
114 else:
115 # The length does not match, we start the download over
116 self.report_unable_to_resume()
117 resume_len = 0
118 open_mode = 'wb'
119 break
120 except socket.error as e:
121 if e.errno != errno.ECONNRESET:
122 # Connection reset is no problem, just retry
123 raise
124
125 # Retry
126 count += 1
127 if count <= retries:
128 self.report_retry(count, retries)
129
130 if count > retries:
131 self.report_error('giving up after %s retries' % retries)
132 return False
133
134 data_len = data.info().get('Content-length', None)
135
136 # Range HTTP header may be ignored/unsupported by a webserver
137 # (e.g. extractor/scivee.py, extractor/bambuser.py).
138 # However, for a test we still would like to download just a piece of a file.
139 # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
140 # block size when downloading a file.
141 if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
142 data_len = self._TEST_FILE_SIZE
143
144 if data_len is not None:
145 data_len = int(data_len) + resume_len
146 min_data_len = self.params.get('min_filesize')
147 max_data_len = self.params.get('max_filesize')
148 if min_data_len is not None and data_len < min_data_len:
149 self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
150 return False
151 if max_data_len is not None and data_len > max_data_len:
152 self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
153 return False
154
155 byte_counter = 0 + resume_len
156 block_size = self.params.get('buffersize', 1024)
157 start = time.time()
158
159 # measure time over whole while-loop, so slow_down() and best_block_size() work together properly
160 now = None # needed for slow_down() in the first loop run
161 before = start # start measuring
162 while True:
163
164 # Download and write
165 data_block = data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
166 byte_counter += len(data_block)
167
168 # exit loop when download is finished
169 if len(data_block) == 0:
170 break
171
172 # Open destination file just in time
173 if stream is None:
174 try:
175 (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
176 assert stream is not None
177 filename = self.undo_temp_name(tmpfilename)
178 self.report_destination(filename)
179 except (OSError, IOError) as err:
180 self.report_error('unable to open for writing: %s' % str(err))
181 return False
182
183 if self.params.get('xattr_set_filesize', False) and data_len is not None:
184 try:
185 write_xattr(tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8'))
186 except (XAttrUnavailableError, XAttrMetadataError) as err:
187 self.report_error('unable to set filesize xattr: %s' % str(err))
188
189 try:
190 stream.write(data_block)
191 except (IOError, OSError) as err:
192 self.to_stderr('\n')
193 self.report_error('unable to write data: %s' % str(err))
194 return False
195
196 # Apply rate limit
197 self.slow_down(start, now, byte_counter - resume_len)
198
199 # end measuring of one loop run
200 now = time.time()
201 after = now
202
203 # Adjust block size
204 if not self.params.get('noresizebuffer', False):
205 block_size = self.best_block_size(after - before, len(data_block))
206
207 before = after
208
209 # Progress message
210 speed = self.calc_speed(start, now, byte_counter - resume_len)
211 if data_len is None:
212 eta = None
213 else:
214 eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
215
216 self._hook_progress({
217 'status': 'downloading',
218 'downloaded_bytes': byte_counter,
219 'total_bytes': data_len,
220 'tmpfilename': tmpfilename,
221 'filename': filename,
222 'eta': eta,
223 'speed': speed,
224 'elapsed': now - start,
225 })
226
227 if is_test and byte_counter == data_len:
228 break
229
230 if stream is None:
231 self.to_stderr('\n')
232 self.report_error('Did not get any data blocks')
233 return False
234 if tmpfilename != '-':
235 stream.close()
236
237 if data_len is not None and byte_counter != data_len:
238 raise ContentTooShortError(byte_counter, int(data_len))
239 self.try_rename(tmpfilename, filename)
240
241 # Update file modification time
242 if self.params.get('updatetime', True):
243 info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
244
245 self._hook_progress({
246 'downloaded_bytes': byte_counter,
247 'total_bytes': byte_counter,
248 'filename': filename,
249 'status': 'finished',
250 'elapsed': time.time() - start,
251 })
252
253 return True