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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
26 class DownloadContext(dict):
27 __getattr__ = dict.get
28 __setattr__ = dict.__setitem__
29 __delattr__ = dict.__delitem__
30
31 ctx = DownloadContext()
32 ctx.filename = filename
33 ctx.tmpfilename = self.temp_name(filename)
34 ctx.stream = None
35
36 # Do not include the Accept-Encoding header
37 headers = {'Youtubedl-no-compression': 'True'}
38 add_headers = info_dict.get('http_headers')
39 if add_headers:
40 headers.update(add_headers)
41 basic_request = sanitized_Request(url, None, headers)
42 request = sanitized_Request(url, None, headers)
43
44 is_test = self.params.get('test', False)
45
46 if is_test:
47 request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))
48
49 ctx.open_mode = 'wb'
50 ctx.resume_len = 0
51
52 if self.params.get('continuedl', True):
53 # Establish possible resume length
54 if os.path.isfile(encodeFilename(ctx.tmpfilename)):
55 ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
56
57 count = 0
58 retries = self.params.get('retries', 0)
59
60 class SucceedDownload(Exception):
61 pass
62
63 class RetryDownload(Exception):
64 def __init__(self, source_error):
65 self.source_error = source_error
66
67 def establish_connection():
68 if ctx.resume_len != 0:
69 self.report_resuming_byte(ctx.resume_len)
70 request.add_header('Range', 'bytes=%d-' % ctx.resume_len)
71 ctx.open_mode = 'ab'
72 # Establish connection
73 try:
74 ctx.data = self.ydl.urlopen(request)
75 # When trying to resume, Content-Range HTTP header of response has to be checked
76 # to match the value of requested Range HTTP header. This is due to a webservers
77 # that don't support resuming and serve a whole file with no Content-Range
78 # set in response despite of requested Range (see
79 # https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
80 if ctx.resume_len > 0:
81 content_range = ctx.data.headers.get('Content-Range')
82 if content_range:
83 content_range_m = re.search(r'bytes (\d+)-', content_range)
84 # Content-Range is present and matches requested Range, resume is possible
85 if content_range_m and ctx.resume_len == int(content_range_m.group(1)):
86 return
87 # Content-Range is either not present or invalid. Assuming remote webserver is
88 # trying to send the whole file, resume is not possible, so wiping the local file
89 # and performing entire redownload
90 self.report_unable_to_resume()
91 ctx.resume_len = 0
92 ctx.open_mode = 'wb'
93 return
94 except (compat_urllib_error.HTTPError, ) as err:
95 if (err.code < 500 or err.code >= 600) and err.code != 416:
96 # Unexpected HTTP error
97 raise
98 elif err.code == 416:
99 # Unable to resume (requested range not satisfiable)
100 try:
101 # Open the connection again without the range header
102 ctx.data = self.ydl.urlopen(basic_request)
103 content_length = ctx.data.info()['Content-Length']
104 except (compat_urllib_error.HTTPError, ) as err:
105 if err.code < 500 or err.code >= 600:
106 raise
107 else:
108 # Examine the reported length
109 if (content_length is not None and
110 (ctx.resume_len - 100 < int(content_length) < ctx.resume_len + 100)):
111 # The file had already been fully downloaded.
112 # Explanation to the above condition: in issue #175 it was revealed that
113 # YouTube sometimes adds or removes a few bytes from the end of the file,
114 # changing the file size slightly and causing problems for some users. So
115 # I decided to implement a suggested change and consider the file
116 # completely downloaded if the file size differs less than 100 bytes from
117 # the one in the hard drive.
118 self.report_file_already_downloaded(ctx.filename)
119 self.try_rename(ctx.tmpfilename, ctx.filename)
120 self._hook_progress({
121 'filename': ctx.filename,
122 'status': 'finished',
123 'downloaded_bytes': ctx.resume_len,
124 'total_bytes': ctx.resume_len,
125 })
126 raise SucceedDownload()
127 else:
128 # The length does not match, we start the download over
129 self.report_unable_to_resume()
130 ctx.resume_len = 0
131 ctx.open_mode = 'wb'
132 return
133 raise RetryDownload(err)
134 except socket.error as err:
135 if err.errno != errno.ECONNRESET:
136 # Connection reset is no problem, just retry
137 raise
138 raise RetryDownload(err)
139
140 def download():
141 data_len = ctx.data.info().get('Content-length', None)
142
143 # Range HTTP header may be ignored/unsupported by a webserver
144 # (e.g. extractor/scivee.py, extractor/bambuser.py).
145 # However, for a test we still would like to download just a piece of a file.
146 # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
147 # block size when downloading a file.
148 if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
149 data_len = self._TEST_FILE_SIZE
150
151 if data_len is not None:
152 data_len = int(data_len) + ctx.resume_len
153 min_data_len = self.params.get('min_filesize')
154 max_data_len = self.params.get('max_filesize')
155 if min_data_len is not None and data_len < min_data_len:
156 self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
157 return False
158 if max_data_len is not None and data_len > max_data_len:
159 self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
160 return False
161
162 byte_counter = 0 + ctx.resume_len
163 block_size = self.params.get('buffersize', 1024)
164 start = time.time()
165
166 # measure time over whole while-loop, so slow_down() and best_block_size() work together properly
167 now = None # needed for slow_down() in the first loop run
168 before = start # start measuring
169
170 def retry(e):
171 if ctx.tmpfilename != '-':
172 ctx.stream.close()
173 ctx.stream = None
174 ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
175 raise RetryDownload(e)
176
177 while True:
178 try:
179 # Download and write
180 data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
181 # socket.timeout is a subclass of socket.error but may not have
182 # errno set
183 except socket.timeout as e:
184 retry(e)
185 except socket.error as e:
186 if e.errno not in (errno.ECONNRESET, errno.ETIMEDOUT):
187 raise
188 retry(e)
189
190 byte_counter += len(data_block)
191
192 # exit loop when download is finished
193 if len(data_block) == 0:
194 break
195
196 # Open destination file just in time
197 if ctx.stream is None:
198 try:
199 ctx.stream, ctx.tmpfilename = sanitize_open(
200 ctx.tmpfilename, ctx.open_mode)
201 assert ctx.stream is not None
202 ctx.filename = self.undo_temp_name(ctx.tmpfilename)
203 self.report_destination(ctx.filename)
204 except (OSError, IOError) as err:
205 self.report_error('unable to open for writing: %s' % str(err))
206 return False
207
208 if self.params.get('xattr_set_filesize', False) and data_len is not None:
209 try:
210 write_xattr(ctx.tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8'))
211 except (XAttrUnavailableError, XAttrMetadataError) as err:
212 self.report_error('unable to set filesize xattr: %s' % str(err))
213
214 try:
215 ctx.stream.write(data_block)
216 except (IOError, OSError) as err:
217 self.to_stderr('\n')
218 self.report_error('unable to write data: %s' % str(err))
219 return False
220
221 # Apply rate limit
222 self.slow_down(start, now, byte_counter - ctx.resume_len)
223
224 # end measuring of one loop run
225 now = time.time()
226 after = now
227
228 # Adjust block size
229 if not self.params.get('noresizebuffer', False):
230 block_size = self.best_block_size(after - before, len(data_block))
231
232 before = after
233
234 # Progress message
235 speed = self.calc_speed(start, now, byte_counter - ctx.resume_len)
236 if data_len is None:
237 eta = None
238 else:
239 eta = self.calc_eta(start, time.time(), data_len - ctx.resume_len, byte_counter - ctx.resume_len)
240
241 self._hook_progress({
242 'status': 'downloading',
243 'downloaded_bytes': byte_counter,
244 'total_bytes': data_len,
245 'tmpfilename': ctx.tmpfilename,
246 'filename': ctx.filename,
247 'eta': eta,
248 'speed': speed,
249 'elapsed': now - start,
250 })
251
252 if is_test and byte_counter == data_len:
253 break
254
255 if ctx.stream is None:
256 self.to_stderr('\n')
257 self.report_error('Did not get any data blocks')
258 return False
259 if ctx.tmpfilename != '-':
260 ctx.stream.close()
261
262 if data_len is not None and byte_counter != data_len:
263 err = ContentTooShortError(byte_counter, int(data_len))
264 if count <= retries:
265 retry(err)
266 raise err
267
268 self.try_rename(ctx.tmpfilename, ctx.filename)
269
270 # Update file modification time
271 if self.params.get('updatetime', True):
272 info_dict['filetime'] = self.try_utime(ctx.filename, ctx.data.info().get('last-modified', None))
273
274 self._hook_progress({
275 'downloaded_bytes': byte_counter,
276 'total_bytes': byte_counter,
277 'filename': ctx.filename,
278 'status': 'finished',
279 'elapsed': time.time() - start,
280 })
281
282 return True
283
284 while count <= retries:
285 try:
286 establish_connection()
287 return download()
288 except RetryDownload as e:
289 count += 1
290 if count <= retries:
291 self.report_retry(e.source_error, count, retries)
292 continue
293 except SucceedDownload:
294 return True
295
296 self.report_error('giving up after %s retries' % retries)
297 return False