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