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[youtubedl] / youtube_dl / downloader / common.py
1 from __future__ import unicode_literals
2
3 import os
4 import re
5 import sys
6 import time
7
8 from ..utils import (
9 compat_str,
10 encodeFilename,
11 format_bytes,
12 timeconvert,
13 )
14
15
16 class FileDownloader(object):
17 """File Downloader class.
18
19 File downloader objects are the ones responsible of downloading the
20 actual video file and writing it to disk.
21
22 File downloaders accept a lot of parameters. In order not to saturate
23 the object constructor with arguments, it receives a dictionary of
24 options instead.
25
26 Available options:
27
28 verbose: Print additional info to stdout.
29 quiet: Do not print messages to stdout.
30 ratelimit: Download speed limit, in bytes/sec.
31 retries: Number of times to retry for HTTP error 5xx
32 buffersize: Size of download buffer in bytes.
33 noresizebuffer: Do not automatically resize the download buffer.
34 continuedl: Try to continue downloads if possible.
35 noprogress: Do not print the progress bar.
36 logtostderr: Log messages to stderr instead of stdout.
37 consoletitle: Display progress in console window's titlebar.
38 nopart: Do not use temporary .part files.
39 updatetime: Use the Last-modified header to set output file timestamps.
40 test: Download only first bytes to test the downloader.
41 min_filesize: Skip files smaller than this size
42 max_filesize: Skip files larger than this size
43
44 Subclasses of this one must re-define the real_download method.
45 """
46
47 _TEST_FILE_SIZE = 10241
48 params = None
49
50 def __init__(self, ydl, params):
51 """Create a FileDownloader object with the given options."""
52 self.ydl = ydl
53 self._progress_hooks = []
54 self.params = params
55
56 @staticmethod
57 def format_seconds(seconds):
58 (mins, secs) = divmod(seconds, 60)
59 (hours, mins) = divmod(mins, 60)
60 if hours > 99:
61 return '--:--:--'
62 if hours == 0:
63 return '%02d:%02d' % (mins, secs)
64 else:
65 return '%02d:%02d:%02d' % (hours, mins, secs)
66
67 @staticmethod
68 def calc_percent(byte_counter, data_len):
69 if data_len is None:
70 return None
71 return float(byte_counter) / float(data_len) * 100.0
72
73 @staticmethod
74 def format_percent(percent):
75 if percent is None:
76 return '---.-%'
77 return '%6s' % ('%3.1f%%' % percent)
78
79 @staticmethod
80 def calc_eta(start, now, total, current):
81 if total is None:
82 return None
83 dif = now - start
84 if current == 0 or dif < 0.001: # One millisecond
85 return None
86 rate = float(current) / dif
87 return int((float(total) - float(current)) / rate)
88
89 @staticmethod
90 def format_eta(eta):
91 if eta is None:
92 return '--:--'
93 return FileDownloader.format_seconds(eta)
94
95 @staticmethod
96 def calc_speed(start, now, bytes):
97 dif = now - start
98 if bytes == 0 or dif < 0.001: # One millisecond
99 return None
100 return float(bytes) / dif
101
102 @staticmethod
103 def format_speed(speed):
104 if speed is None:
105 return '%10s' % '---b/s'
106 return '%10s' % ('%s/s' % format_bytes(speed))
107
108 @staticmethod
109 def best_block_size(elapsed_time, bytes):
110 new_min = max(bytes / 2.0, 1.0)
111 new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
112 if elapsed_time < 0.001:
113 return int(new_max)
114 rate = bytes / elapsed_time
115 if rate > new_max:
116 return int(new_max)
117 if rate < new_min:
118 return int(new_min)
119 return int(rate)
120
121 @staticmethod
122 def parse_bytes(bytestr):
123 """Parse a string indicating a byte quantity into an integer."""
124 matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
125 if matchobj is None:
126 return None
127 number = float(matchobj.group(1))
128 multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
129 return int(round(number * multiplier))
130
131 def to_screen(self, *args, **kargs):
132 self.ydl.to_screen(*args, **kargs)
133
134 def to_stderr(self, message):
135 self.ydl.to_screen(message)
136
137 def to_console_title(self, message):
138 self.ydl.to_console_title(message)
139
140 def trouble(self, *args, **kargs):
141 self.ydl.trouble(*args, **kargs)
142
143 def report_warning(self, *args, **kargs):
144 self.ydl.report_warning(*args, **kargs)
145
146 def report_error(self, *args, **kargs):
147 self.ydl.report_error(*args, **kargs)
148
149 def slow_down(self, start_time, byte_counter):
150 """Sleep if the download speed is over the rate limit."""
151 rate_limit = self.params.get('ratelimit', None)
152 if rate_limit is None or byte_counter == 0:
153 return
154 now = time.time()
155 elapsed = now - start_time
156 if elapsed <= 0.0:
157 return
158 speed = float(byte_counter) / elapsed
159 if speed > rate_limit:
160 time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
161
162 def temp_name(self, filename):
163 """Returns a temporary filename for the given filename."""
164 if self.params.get('nopart', False) or filename == '-' or \
165 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
166 return filename
167 return filename + '.part'
168
169 def undo_temp_name(self, filename):
170 if filename.endswith('.part'):
171 return filename[:-len('.part')]
172 return filename
173
174 def try_rename(self, old_filename, new_filename):
175 try:
176 if old_filename == new_filename:
177 return
178 os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
179 except (IOError, OSError) as err:
180 self.report_error('unable to rename file: %s' % compat_str(err))
181
182 def try_utime(self, filename, last_modified_hdr):
183 """Try to set the last-modified time of the given file."""
184 if last_modified_hdr is None:
185 return
186 if not os.path.isfile(encodeFilename(filename)):
187 return
188 timestr = last_modified_hdr
189 if timestr is None:
190 return
191 filetime = timeconvert(timestr)
192 if filetime is None:
193 return filetime
194 # Ignore obviously invalid dates
195 if filetime == 0:
196 return
197 try:
198 os.utime(filename, (time.time(), filetime))
199 except:
200 pass
201 return filetime
202
203 def report_destination(self, filename):
204 """Report destination filename."""
205 self.to_screen('[download] Destination: ' + filename)
206
207 def _report_progress_status(self, msg, is_last_line=False):
208 fullmsg = '[download] ' + msg
209 if self.params.get('progress_with_newline', False):
210 self.to_screen(fullmsg)
211 else:
212 if os.name == 'nt':
213 prev_len = getattr(self, '_report_progress_prev_line_length',
214 0)
215 if prev_len > len(fullmsg):
216 fullmsg += ' ' * (prev_len - len(fullmsg))
217 self._report_progress_prev_line_length = len(fullmsg)
218 clear_line = '\r'
219 else:
220 clear_line = ('\r\x1b[K' if sys.stderr.isatty() else '\r')
221 self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line)
222 self.to_console_title('youtube-dl ' + msg)
223
224 def report_progress(self, percent, data_len_str, speed, eta):
225 """Report download progress."""
226 if self.params.get('noprogress', False):
227 return
228 if eta is not None:
229 eta_str = self.format_eta(eta)
230 else:
231 eta_str = 'Unknown ETA'
232 if percent is not None:
233 percent_str = self.format_percent(percent)
234 else:
235 percent_str = 'Unknown %'
236 speed_str = self.format_speed(speed)
237
238 msg = ('%s of %s at %s ETA %s' %
239 (percent_str, data_len_str, speed_str, eta_str))
240 self._report_progress_status(msg)
241
242 def report_progress_live_stream(self, downloaded_data_len, speed, elapsed):
243 if self.params.get('noprogress', False):
244 return
245 downloaded_str = format_bytes(downloaded_data_len)
246 speed_str = self.format_speed(speed)
247 elapsed_str = FileDownloader.format_seconds(elapsed)
248 msg = '%s at %s (%s)' % (downloaded_str, speed_str, elapsed_str)
249 self._report_progress_status(msg)
250
251 def report_finish(self, data_len_str, tot_time):
252 """Report download finished."""
253 if self.params.get('noprogress', False):
254 self.to_screen('[download] Download completed')
255 else:
256 self._report_progress_status(
257 ('100%% of %s in %s' %
258 (data_len_str, self.format_seconds(tot_time))),
259 is_last_line=True)
260
261 def report_resuming_byte(self, resume_len):
262 """Report attempt to resume at given byte."""
263 self.to_screen('[download] Resuming download at byte %s' % resume_len)
264
265 def report_retry(self, count, retries):
266 """Report retry in case of HTTP error 5xx"""
267 self.to_screen('[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
268
269 def report_file_already_downloaded(self, file_name):
270 """Report file has already been fully downloaded."""
271 try:
272 self.to_screen('[download] %s has already been downloaded' % file_name)
273 except UnicodeEncodeError:
274 self.to_screen('[download] The file has already been downloaded')
275
276 def report_unable_to_resume(self):
277 """Report it was impossible to resume download."""
278 self.to_screen('[download] Unable to resume')
279
280 def download(self, filename, info_dict):
281 """Download to a filename using the info from info_dict
282 Return True on success and False otherwise
283 """
284 # Check file already present
285 if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
286 self.report_file_already_downloaded(filename)
287 self._hook_progress({
288 'filename': filename,
289 'status': 'finished',
290 'total_bytes': os.path.getsize(encodeFilename(filename)),
291 })
292 return True
293
294 return self.real_download(filename, info_dict)
295
296 def real_download(self, filename, info_dict):
297 """Real download process. Redefine in subclasses."""
298 raise NotImplementedError('This method must be implemented by subclasses')
299
300 def _hook_progress(self, status):
301 for ph in self._progress_hooks:
302 ph(status)
303
304 def add_progress_hook(self, ph):
305 """ ph gets called on download progress, with a dictionary with the entries
306 * filename: The final filename
307 * status: One of "downloading" and "finished"
308
309 It can also have some of the following entries:
310
311 * downloaded_bytes: Bytes on disks
312 * total_bytes: Total bytes, None if unknown
313 * tmpfilename: The filename we're currently writing to
314 * eta: The estimated time in seconds, None if unknown
315 * speed: The download speed in bytes/second, None if unknown
316
317 Hooks are guaranteed to be called at least once (with status "finished")
318 if the download is successful.
319 """
320 self._progress_hooks.append(ph)