14 class FileDownloader(object):
15 """File Downloader class.
17 File downloader objects are the ones responsible of downloading the
18 actual video file and writing it to disk.
20 File downloaders accept a lot of parameters. In order not to saturate
21 the object constructor with arguments, it receives a dictionary of
26 verbose: Print additional info to stdout.
27 quiet: Do not print messages to stdout.
28 ratelimit: Download speed limit, in bytes/sec.
29 retries: Number of times to retry for HTTP error 5xx
30 buffersize: Size of download buffer in bytes.
31 noresizebuffer: Do not automatically resize the download buffer.
32 continuedl: Try to continue downloads if possible.
33 noprogress: Do not print the progress bar.
34 logtostderr: Log messages to stderr instead of stdout.
35 consoletitle: Display progress in console window's titlebar.
36 nopart: Do not use temporary .part files.
37 updatetime: Use the Last-modified header to set output file timestamps.
38 test: Download only first bytes to test the downloader.
39 min_filesize: Skip files smaller than this size
40 max_filesize: Skip files larger than this size
42 Subclasses of this one must re-define the real_download method.
45 _TEST_FILE_SIZE = 10241
48 def __init__(self, ydl, params):
49 """Create a FileDownloader object with the given options."""
51 self._progress_hooks = []
55 def format_seconds(seconds):
56 (mins, secs) = divmod(seconds, 60)
57 (hours, mins) = divmod(mins, 60)
61 return '%02d:%02d' % (mins, secs)
63 return '%02d:%02d:%02d' % (hours, mins, secs)
66 def calc_percent(byte_counter, data_len):
69 return float(byte_counter) / float(data_len) * 100.0
72 def format_percent(percent):
75 return '%6s' % ('%3.1f%%' % percent)
78 def calc_eta(start, now, total, current):
82 if current == 0 or dif < 0.001: # One millisecond
84 rate = float(current) / dif
85 return int((float(total) - float(current)) / rate)
91 return FileDownloader.format_seconds(eta)
94 def calc_speed(start, now, bytes):
96 if bytes == 0 or dif < 0.001: # One millisecond
98 return float(bytes) / dif
101 def format_speed(speed):
103 return '%10s' % '---b/s'
104 return '%10s' % ('%s/s' % format_bytes(speed))
107 def best_block_size(elapsed_time, bytes):
108 new_min = max(bytes / 2.0, 1.0)
109 new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB
110 if elapsed_time < 0.001:
112 rate = bytes / elapsed_time
120 def parse_bytes(bytestr):
121 """Parse a string indicating a byte quantity into an integer."""
122 matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
125 number = float(matchobj.group(1))
126 multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
127 return int(round(number * multiplier))
129 def to_screen(self, *args, **kargs):
130 self.ydl.to_screen(*args, **kargs)
132 def to_stderr(self, message):
133 self.ydl.to_screen(message)
135 def to_console_title(self, message):
136 self.ydl.to_console_title(message)
138 def trouble(self, *args, **kargs):
139 self.ydl.trouble(*args, **kargs)
141 def report_warning(self, *args, **kargs):
142 self.ydl.report_warning(*args, **kargs)
144 def report_error(self, *args, **kargs):
145 self.ydl.report_error(*args, **kargs)
147 def slow_down(self, start_time, byte_counter):
148 """Sleep if the download speed is over the rate limit."""
149 rate_limit = self.params.get('ratelimit', None)
150 if rate_limit is None or byte_counter == 0:
153 elapsed = now - start_time
156 speed = float(byte_counter) / elapsed
157 if speed > rate_limit:
158 time.sleep((byte_counter - rate_limit * (now - start_time)) / rate_limit)
160 def temp_name(self, filename):
161 """Returns a temporary filename for the given filename."""
162 if self.params.get('nopart', False) or filename == u'-' or \
163 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
165 return filename + u'.part'
167 def undo_temp_name(self, filename):
168 if filename.endswith(u'.part'):
169 return filename[:-len(u'.part')]
172 def try_rename(self, old_filename, new_filename):
174 if old_filename == new_filename:
176 os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
177 except (IOError, OSError) as err:
178 self.report_error(u'unable to rename file: %s' % compat_str(err))
180 def try_utime(self, filename, last_modified_hdr):
181 """Try to set the last-modified time of the given file."""
182 if last_modified_hdr is None:
184 if not os.path.isfile(encodeFilename(filename)):
186 timestr = last_modified_hdr
189 filetime = timeconvert(timestr)
192 # Ignore obviously invalid dates
196 os.utime(filename, (time.time(), filetime))
201 def report_destination(self, filename):
202 """Report destination filename."""
203 self.to_screen(u'[download] Destination: ' + filename)
205 def _report_progress_status(self, msg, is_last_line=False):
206 fullmsg = u'[download] ' + msg
207 if self.params.get('progress_with_newline', False):
208 self.to_screen(fullmsg)
211 prev_len = getattr(self, '_report_progress_prev_line_length',
213 if prev_len > len(fullmsg):
214 fullmsg += u' ' * (prev_len - len(fullmsg))
215 self._report_progress_prev_line_length = len(fullmsg)
218 clear_line = (u'\r\x1b[K' if sys.stderr.isatty() else u'\r')
219 self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line)
220 self.to_console_title(u'youtube-dl ' + msg)
222 def report_progress(self, percent, data_len_str, speed, eta):
223 """Report download progress."""
224 if self.params.get('noprogress', False):
227 eta_str = self.format_eta(eta)
229 eta_str = 'Unknown ETA'
230 if percent is not None:
231 percent_str = self.format_percent(percent)
233 percent_str = 'Unknown %'
234 speed_str = self.format_speed(speed)
236 msg = (u'%s of %s at %s ETA %s' %
237 (percent_str, data_len_str, speed_str, eta_str))
238 self._report_progress_status(msg)
240 def report_progress_live_stream(self, downloaded_data_len, speed, elapsed):
241 if self.params.get('noprogress', False):
243 downloaded_str = format_bytes(downloaded_data_len)
244 speed_str = self.format_speed(speed)
245 elapsed_str = FileDownloader.format_seconds(elapsed)
246 msg = u'%s at %s (%s)' % (downloaded_str, speed_str, elapsed_str)
247 self._report_progress_status(msg)
249 def report_finish(self, data_len_str, tot_time):
250 """Report download finished."""
251 if self.params.get('noprogress', False):
252 self.to_screen(u'[download] Download completed')
254 self._report_progress_status(
255 (u'100%% of %s in %s' %
256 (data_len_str, self.format_seconds(tot_time))),
259 def report_resuming_byte(self, resume_len):
260 """Report attempt to resume at given byte."""
261 self.to_screen(u'[download] Resuming download at byte %s' % resume_len)
263 def report_retry(self, count, retries):
264 """Report retry in case of HTTP error 5xx"""
265 self.to_screen(u'[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
267 def report_file_already_downloaded(self, file_name):
268 """Report file has already been fully downloaded."""
270 self.to_screen(u'[download] %s has already been downloaded' % file_name)
271 except UnicodeEncodeError:
272 self.to_screen(u'[download] The file has already been downloaded')
274 def report_unable_to_resume(self):
275 """Report it was impossible to resume download."""
276 self.to_screen(u'[download] Unable to resume')
278 def download(self, filename, info_dict):
279 """Download to a filename using the info from info_dict
280 Return True on success and False otherwise
282 # Check file already present
283 if self.params.get('continuedl', False) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False):
284 self.report_file_already_downloaded(filename)
285 self._hook_progress({
286 'filename': filename,
287 'status': 'finished',
288 'total_bytes': os.path.getsize(encodeFilename(filename)),
292 return self.real_download(filename, info_dict)
294 def real_download(self, filename, info_dict):
295 """Real download process. Redefine in subclasses."""
296 raise NotImplementedError(u'This method must be implemented by subclasses')
298 def _hook_progress(self, status):
299 for ph in self._progress_hooks:
302 def add_progress_hook(self, ph):
303 """ ph gets called on download progress, with a dictionary with the entries
304 * filename: The final filename
305 * status: One of "downloading" and "finished"
307 It can also have some of the following entries:
309 * downloaded_bytes: Bytes on disks
310 * total_bytes: Total bytes, None if unknown
311 * tmpfilename: The filename we're currently writing to
312 * eta: The estimated time in seconds, None if unknown
313 * speed: The download speed in bytes/second, None if unknown
315 Hooks are guaranteed to be called at least once (with status "finished")
316 if the download is successful.
318 self._progress_hooks.append(ph)