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3bc2ddcc JMF |
1 | import os |
2 | import re | |
3 | import subprocess | |
4 | import sys | |
5 | import time | |
6 | ||
7 | from .common import FileDownloader | |
8 | from ..utils import ( | |
9 | compat_urllib_request, | |
10 | compat_urllib_error, | |
11 | ContentTooShortError, | |
12 | ||
13 | encodeFilename, | |
14 | sanitize_open, | |
15 | format_bytes, | |
16 | ) | |
17 | ||
18 | ||
19 | class HttpFD(FileDownloader): | |
20 | def real_download(self, filename, info_dict): | |
21 | url = info_dict['url'] | |
22 | tmpfilename = self.temp_name(filename) | |
23 | stream = None | |
24 | ||
25 | # Do not include the Accept-Encoding header | |
26 | headers = {'Youtubedl-no-compression': 'True'} | |
27 | if 'user_agent' in info_dict: | |
28 | headers['Youtubedl-user-agent'] = info_dict['user_agent'] | |
29 | basic_request = compat_urllib_request.Request(url, None, headers) | |
30 | request = compat_urllib_request.Request(url, None, headers) | |
31 | ||
32 | if self.params.get('test', False): | |
33 | request.add_header('Range','bytes=0-10240') | |
34 | ||
35 | # Establish possible resume length | |
36 | if os.path.isfile(encodeFilename(tmpfilename)): | |
37 | resume_len = os.path.getsize(encodeFilename(tmpfilename)) | |
38 | else: | |
39 | resume_len = 0 | |
40 | ||
41 | open_mode = 'wb' | |
42 | if resume_len != 0: | |
43 | if self.params.get('continuedl', False): | |
44 | self.report_resuming_byte(resume_len) | |
45 | request.add_header('Range','bytes=%d-' % resume_len) | |
46 | open_mode = 'ab' | |
47 | else: | |
48 | resume_len = 0 | |
49 | ||
50 | count = 0 | |
51 | retries = self.params.get('retries', 0) | |
52 | while count <= retries: | |
53 | # Establish connection | |
54 | try: | |
3bc2ddcc JMF |
55 | data = compat_urllib_request.urlopen(request) |
56 | break | |
57 | except (compat_urllib_error.HTTPError, ) as err: | |
58 | if (err.code < 500 or err.code >= 600) and err.code != 416: | |
59 | # Unexpected HTTP error | |
60 | raise | |
61 | elif err.code == 416: | |
62 | # Unable to resume (requested range not satisfiable) | |
63 | try: | |
64 | # Open the connection again without the range header | |
65 | data = compat_urllib_request.urlopen(basic_request) | |
66 | content_length = data.info()['Content-Length'] | |
67 | except (compat_urllib_error.HTTPError, ) as err: | |
68 | if err.code < 500 or err.code >= 600: | |
69 | raise | |
70 | else: | |
71 | # Examine the reported length | |
72 | if (content_length is not None and | |
73 | (resume_len - 100 < int(content_length) < resume_len + 100)): | |
74 | # The file had already been fully downloaded. | |
75 | # Explanation to the above condition: in issue #175 it was revealed that | |
76 | # YouTube sometimes adds or removes a few bytes from the end of the file, | |
77 | # changing the file size slightly and causing problems for some users. So | |
78 | # I decided to implement a suggested change and consider the file | |
79 | # completely downloaded if the file size differs less than 100 bytes from | |
80 | # the one in the hard drive. | |
81 | self.report_file_already_downloaded(filename) | |
82 | self.try_rename(tmpfilename, filename) | |
83 | self._hook_progress({ | |
84 | 'filename': filename, | |
85 | 'status': 'finished', | |
86 | }) | |
87 | return True | |
88 | else: | |
89 | # The length does not match, we start the download over | |
90 | self.report_unable_to_resume() | |
91 | open_mode = 'wb' | |
92 | break | |
93 | # Retry | |
94 | count += 1 | |
95 | if count <= retries: | |
96 | self.report_retry(count, retries) | |
97 | ||
98 | if count > retries: | |
99 | self.report_error(u'giving up after %s retries' % retries) | |
100 | return False | |
101 | ||
102 | data_len = data.info().get('Content-length', None) | |
103 | if data_len is not None: | |
104 | data_len = int(data_len) + resume_len | |
105 | min_data_len = self.params.get("min_filesize", None) | |
106 | max_data_len = self.params.get("max_filesize", None) | |
107 | if min_data_len is not None and data_len < min_data_len: | |
108 | self.to_screen(u'\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len)) | |
109 | return False | |
110 | if max_data_len is not None and data_len > max_data_len: | |
111 | self.to_screen(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len)) | |
112 | return False | |
113 | ||
114 | data_len_str = format_bytes(data_len) | |
115 | byte_counter = 0 + resume_len | |
116 | block_size = self.params.get('buffersize', 1024) | |
117 | start = time.time() | |
118 | while True: | |
119 | # Download and write | |
120 | before = time.time() | |
121 | data_block = data.read(block_size) | |
122 | after = time.time() | |
123 | if len(data_block) == 0: | |
124 | break | |
125 | byte_counter += len(data_block) | |
126 | ||
127 | # Open file just in time | |
128 | if stream is None: | |
129 | try: | |
130 | (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode) | |
131 | assert stream is not None | |
132 | filename = self.undo_temp_name(tmpfilename) | |
133 | self.report_destination(filename) | |
134 | except (OSError, IOError) as err: | |
135 | self.report_error(u'unable to open for writing: %s' % str(err)) | |
136 | return False | |
137 | try: | |
138 | stream.write(data_block) | |
139 | except (IOError, OSError): | |
140 | self.to_stderr(u"\n") | |
141 | self.report_error(u'unable to write data: %s' % str(err)) | |
142 | return False | |
143 | if not self.params.get('noresizebuffer', False): | |
144 | block_size = self.best_block_size(after - before, len(data_block)) | |
145 | ||
146 | # Progress message | |
147 | speed = self.calc_speed(start, time.time(), byte_counter - resume_len) | |
148 | if data_len is None: | |
149 | eta = percent = None | |
150 | else: | |
151 | percent = self.calc_percent(byte_counter, data_len) | |
152 | eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len) | |
153 | self.report_progress(percent, data_len_str, speed, eta) | |
154 | ||
155 | self._hook_progress({ | |
156 | 'downloaded_bytes': byte_counter, | |
157 | 'total_bytes': data_len, | |
158 | 'tmpfilename': tmpfilename, | |
159 | 'filename': filename, | |
160 | 'status': 'downloading', | |
161 | 'eta': eta, | |
162 | 'speed': speed, | |
163 | }) | |
164 | ||
165 | # Apply rate limit | |
166 | self.slow_down(start, byte_counter - resume_len) | |
167 | ||
168 | if stream is None: | |
169 | self.to_stderr(u"\n") | |
170 | self.report_error(u'Did not get any data blocks') | |
171 | return False | |
172 | stream.close() | |
173 | self.report_finish(data_len_str, (time.time() - start)) | |
174 | if data_len is not None and byte_counter != data_len: | |
175 | raise ContentTooShortError(byte_counter, int(data_len)) | |
176 | self.try_rename(tmpfilename, filename) | |
177 | ||
178 | # Update file modification time | |
179 | if self.params.get('updatetime', True): | |
180 | info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None)) | |
181 | ||
182 | self._hook_progress({ | |
183 | 'downloaded_bytes': byte_counter, | |
184 | 'total_bytes': byte_counter, | |
185 | 'filename': filename, | |
186 | 'status': 'finished', | |
187 | }) | |
188 | ||
189 | return True |