1 from __future__ import unicode_literals
8 from ..compat import compat_str
16 class FileDownloader(object):
17 """File Downloader class.
19 File downloader objects are the ones responsible of downloading the
20 actual video file and writing it to disk.
22 File downloaders accept a lot of parameters. In order not to saturate
23 the object constructor with arguments, it receives a dictionary of
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
44 Subclasses of this one must re-define the real_download method.
47 _TEST_FILE_SIZE = 10241
50 def __init__(self, ydl, params):
51 """Create a FileDownloader object with the given options."""
53 self._progress_hooks = []
57 def format_seconds(seconds):
58 (mins, secs) = divmod(seconds, 60)
59 (hours, mins) = divmod(mins, 60)
63 return '%02d:%02d' % (mins, secs)
65 return '%02d:%02d:%02d' % (hours, mins, secs)
68 def calc_percent(byte_counter, data_len):
71 return float(byte_counter) / float(data_len) * 100.0
74 def format_percent(percent):
77 return '%6s' % ('%3.1f%%' % percent)
80 def calc_eta(start, now, total, current):
86 if current == 0 or dif < 0.001: # One millisecond
88 rate = float(current) / dif
89 return int((float(total) - float(current)) / rate)
95 return FileDownloader.format_seconds(eta)
98 def calc_speed(start, now, bytes):
100 if bytes == 0 or dif < 0.001: # One millisecond
102 return float(bytes) / dif
105 def format_speed(speed):
107 return '%10s' % '---b/s'
108 return '%10s' % ('%s/s' % format_bytes(speed))
111 def best_block_size(elapsed_time, bytes):
112 new_min = max(bytes / 2.0, 1.0)
113 new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
114 if elapsed_time < 0.001:
116 rate = bytes / elapsed_time
124 def parse_bytes(bytestr):
125 """Parse a string indicating a byte quantity into an integer."""
126 matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
129 number = float(matchobj.group(1))
130 multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
131 return int(round(number * multiplier))
133 def to_screen(self, *args, **kargs):
134 self.ydl.to_screen(*args, **kargs)
136 def to_stderr(self, message):
137 self.ydl.to_screen(message)
139 def to_console_title(self, message):
140 self.ydl.to_console_title(message)
142 def trouble(self, *args, **kargs):
143 self.ydl.trouble(*args, **kargs)
145 def report_warning(self, *args, **kargs):
146 self.ydl.report_warning(*args, **kargs)
148 def report_error(self, *args, **kargs):
149 self.ydl.report_error(*args, **kargs)
151 def slow_down(self, start_time, now, byte_counter):
152 """Sleep if the download speed is over the rate limit."""
153 rate_limit = self.params.get('ratelimit', None)
154 if rate_limit is None or byte_counter == 0:
158 elapsed = now - start_time
161 speed = float(byte_counter) / elapsed
162 if speed > rate_limit:
163 time.sleep(max((byte_counter // rate_limit) - elapsed, 0))
165 def temp_name(self, filename):
166 """Returns a temporary filename for the given filename."""
167 if self.params.get('nopart', False) or filename == '-' or \
168 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
170 return filename + '.part'
172 def undo_temp_name(self, filename):
173 if filename.endswith('.part'):
174 return filename[:-len('.part')]
177 def try_rename(self, old_filename, new_filename):
179 if old_filename == new_filename:
181 os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
182 except (IOError, OSError) as err:
183 self.report_error('unable to rename file: %s' % compat_str(err))
185 def try_utime(self, filename, last_modified_hdr):
186 """Try to set the last-modified time of the given file."""
187 if last_modified_hdr is None:
189 if not os.path.isfile(encodeFilename(filename)):
191 timestr = last_modified_hdr
194 filetime = timeconvert(timestr)
197 # Ignore obviously invalid dates
201 os.utime(filename, (time.time(), filetime))
206 def report_destination(self, filename):
207 """Report destination filename."""
208 self.to_screen('[download] Destination: ' + filename)
210 def _report_progress_status(self, msg, is_last_line=False):
211 fullmsg = '[download] ' + msg
212 if self.params.get('progress_with_newline', False):
213 self.to_screen(fullmsg)
216 prev_len = getattr(self, '_report_progress_prev_line_length',
218 if prev_len > len(fullmsg):
219 fullmsg += ' ' * (prev_len - len(fullmsg))
220 self._report_progress_prev_line_length = len(fullmsg)
223 clear_line = ('\r\x1b[K' if sys.stderr.isatty() else '\r')
224 self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line)
225 self.to_console_title('youtube-dl ' + msg)
227 def report_progress(self, percent, data_len_str, speed, eta):
228 """Report download progress."""
229 if self.params.get('noprogress', False):
232 eta_str = self.format_eta(eta)
234 eta_str = 'Unknown ETA'
235 if percent is not None:
236 percent_str = self.format_percent(percent)
238 percent_str = 'Unknown %'
239 speed_str = self.format_speed(speed)
241 msg = ('%s of %s at %s ETA %s' %
242 (percent_str, data_len_str, speed_str, eta_str))
243 self._report_progress_status(msg)
245 def report_progress_live_stream(self, downloaded_data_len, speed, elapsed):
246 if self.params.get('noprogress', False):
248 downloaded_str = format_bytes(downloaded_data_len)
249 speed_str = self.format_speed(speed)
250 elapsed_str = FileDownloader.format_seconds(elapsed)
251 msg = '%s at %s (%s)' % (downloaded_str, speed_str, elapsed_str)
252 self._report_progress_status(msg)
254 def report_finish(self, data_len_str, tot_time):
255 """Report download finished."""
256 if self.params.get('noprogress', False):
257 self.to_screen('[download] Download completed')
259 self._report_progress_status(
260 ('100%% of %s in %s' %
261 (data_len_str, self.format_seconds(tot_time))),
264 def report_resuming_byte(self, resume_len):
265 """Report attempt to resume at given byte."""
266 self.to_screen('[download] Resuming download at byte %s' % resume_len)
268 def report_retry(self, count, retries):
269 """Report retry in case of HTTP error 5xx"""
270 self.to_screen('[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
272 def report_file_already_downloaded(self, file_name):
273 """Report file has already been fully downloaded."""
275 self.to_screen('[download] %s has already been downloaded' % file_name)
276 except UnicodeEncodeError:
277 self.to_screen('[download] The file has already been downloaded')
279 def report_unable_to_resume(self):
280 """Report it was impossible to resume download."""
281 self.to_screen('[download] Unable to resume')
283 def download(self, filename, info_dict):
284 """Download to a filename using the info from info_dict
285 Return True on success and False otherwise
287 # Check file already present
288 if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
289 self.report_file_already_downloaded(filename)
290 self._hook_progress({
291 'filename': filename,
292 'status': 'finished',
293 'total_bytes': os.path.getsize(encodeFilename(filename)),
297 return self.real_download(filename, info_dict)
299 def real_download(self, filename, info_dict):
300 """Real download process. Redefine in subclasses."""
301 raise NotImplementedError('This method must be implemented by subclasses')
303 def _hook_progress(self, status):
304 for ph in self._progress_hooks:
307 def add_progress_hook(self, ph):
308 """ ph gets called on download progress, with a dictionary with the entries
309 * filename: The final filename
310 * status: One of "downloading" and "finished"
312 It can also have some of the following entries:
314 * downloaded_bytes: Bytes on disks
315 * total_bytes: Total bytes, None if unknown
316 * tmpfilename: The filename we're currently writing to
317 * eta: The estimated time in seconds, None if unknown
318 * speed: The download speed in bytes/second, None if unknown
320 Hooks are guaranteed to be called at least once (with status "finished")
321 if the download is successful.
323 self._progress_hooks.append(ph)