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[youtubedl] / youtube_dl / downloader / http.py
1 import os
2 import time
3
4 from .common import FileDownloader
5 from ..utils import (
6 compat_urllib_request,
7 compat_urllib_error,
8 ContentTooShortError,
9
10 encodeFilename,
11 sanitize_open,
12 format_bytes,
13 )
14
15
16 class HttpFD(FileDownloader):
17 def real_download(self, filename, info_dict):
18 url = info_dict['url']
19 tmpfilename = self.temp_name(filename)
20 stream = None
21
22 # Do not include the Accept-Encoding header
23 headers = {'Youtubedl-no-compression': 'True'}
24 if 'user_agent' in info_dict:
25 headers['Youtubedl-user-agent'] = info_dict['user_agent']
26 basic_request = compat_urllib_request.Request(url, None, headers)
27 request = compat_urllib_request.Request(url, None, headers)
28
29 if self.params.get('test', False):
30 request.add_header('Range', 'bytes=0-10240')
31
32 # Establish possible resume length
33 if os.path.isfile(encodeFilename(tmpfilename)):
34 resume_len = os.path.getsize(encodeFilename(tmpfilename))
35 else:
36 resume_len = 0
37
38 open_mode = 'wb'
39 if resume_len != 0:
40 if self.params.get('continuedl', False):
41 self.report_resuming_byte(resume_len)
42 request.add_header('Range', 'bytes=%d-' % resume_len)
43 open_mode = 'ab'
44 else:
45 resume_len = 0
46
47 count = 0
48 retries = self.params.get('retries', 0)
49 while count <= retries:
50 # Establish connection
51 try:
52 data = compat_urllib_request.urlopen(request)
53 break
54 except (compat_urllib_error.HTTPError, ) as err:
55 if (err.code < 500 or err.code >= 600) and err.code != 416:
56 # Unexpected HTTP error
57 raise
58 elif err.code == 416:
59 # Unable to resume (requested range not satisfiable)
60 try:
61 # Open the connection again without the range header
62 data = compat_urllib_request.urlopen(basic_request)
63 content_length = data.info()['Content-Length']
64 except (compat_urllib_error.HTTPError, ) as err:
65 if err.code < 500 or err.code >= 600:
66 raise
67 else:
68 # Examine the reported length
69 if (content_length is not None and
70 (resume_len - 100 < int(content_length) < resume_len + 100)):
71 # The file had already been fully downloaded.
72 # Explanation to the above condition: in issue #175 it was revealed that
73 # YouTube sometimes adds or removes a few bytes from the end of the file,
74 # changing the file size slightly and causing problems for some users. So
75 # I decided to implement a suggested change and consider the file
76 # completely downloaded if the file size differs less than 100 bytes from
77 # the one in the hard drive.
78 self.report_file_already_downloaded(filename)
79 self.try_rename(tmpfilename, filename)
80 self._hook_progress({
81 'filename': filename,
82 'status': 'finished',
83 })
84 return True
85 else:
86 # The length does not match, we start the download over
87 self.report_unable_to_resume()
88 open_mode = 'wb'
89 break
90 # Retry
91 count += 1
92 if count <= retries:
93 self.report_retry(count, retries)
94
95 if count > retries:
96 self.report_error(u'giving up after %s retries' % retries)
97 return False
98
99 data_len = data.info().get('Content-length', None)
100 if data_len is not None:
101 data_len = int(data_len) + resume_len
102 min_data_len = self.params.get("min_filesize", None)
103 max_data_len = self.params.get("max_filesize", None)
104 if min_data_len is not None and data_len < min_data_len:
105 self.to_screen(u'\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
106 return False
107 if max_data_len is not None and data_len > max_data_len:
108 self.to_screen(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
109 return False
110
111 data_len_str = format_bytes(data_len)
112 byte_counter = 0 + resume_len
113 block_size = self.params.get('buffersize', 1024)
114 start = time.time()
115 while True:
116 # Download and write
117 before = time.time()
118 data_block = data.read(block_size)
119 after = time.time()
120 if len(data_block) == 0:
121 break
122 byte_counter += len(data_block)
123
124 # Open file just in time
125 if stream is None:
126 try:
127 (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
128 assert stream is not None
129 filename = self.undo_temp_name(tmpfilename)
130 self.report_destination(filename)
131 except (OSError, IOError) as err:
132 self.report_error(u'unable to open for writing: %s' % str(err))
133 return False
134 try:
135 stream.write(data_block)
136 except (IOError, OSError) as err:
137 self.to_stderr(u"\n")
138 self.report_error(u'unable to write data: %s' % str(err))
139 return False
140 if not self.params.get('noresizebuffer', False):
141 block_size = self.best_block_size(after - before, len(data_block))
142
143 # Progress message
144 speed = self.calc_speed(start, time.time(), byte_counter - resume_len)
145 if data_len is None:
146 eta = percent = None
147 else:
148 percent = self.calc_percent(byte_counter, data_len)
149 eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
150 self.report_progress(percent, data_len_str, speed, eta)
151
152 self._hook_progress({
153 'downloaded_bytes': byte_counter,
154 'total_bytes': data_len,
155 'tmpfilename': tmpfilename,
156 'filename': filename,
157 'status': 'downloading',
158 'eta': eta,
159 'speed': speed,
160 })
161
162 # Apply rate limit
163 self.slow_down(start, byte_counter - resume_len)
164
165 if stream is None:
166 self.to_stderr(u"\n")
167 self.report_error(u'Did not get any data blocks')
168 return False
169 stream.close()
170 self.report_finish(data_len_str, (time.time() - start))
171 if data_len is not None and byte_counter != data_len:
172 raise ContentTooShortError(byte_counter, int(data_len))
173 self.try_rename(tmpfilename, filename)
174
175 # Update file modification time
176 if self.params.get('updatetime', True):
177 info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
178
179 self._hook_progress({
180 'downloaded_bytes': byte_counter,
181 'total_bytes': byte_counter,
182 'filename': filename,
183 'status': 'finished',
184 })
185
186 return True