Raphaël G. Git Repositories - youtubedl/blob - 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 ..compat import compat_str
   9 from ..utils import (
  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     xattr_set_filesize: Set ytdl.filesize user xattribute with expected size.
  44                         (experimenatal)
  45
  46     Subclasses of this one must re-define the real_download method.
  47     """
  48
  49     _TEST_FILE_SIZE = 10241
  50     params = None
  51
  52     def __init__(self, ydl, params):
  53         """Create a FileDownloader object with the given options."""
  54         self.ydl = ydl
  55         self._progress_hooks = []
  56         self.params = params
  57
  58     @staticmethod
  59     def format_seconds(seconds):
  60         (mins, secs) = divmod(seconds, 60)
  61         (hours, mins) = divmod(mins, 60)
  62         if hours > 99:
  63             return '--:--:--'
  64         if hours == 0:
  65             return '%02d:%02d' % (mins, secs)
  66         else:
  67             return '%02d:%02d:%02d' % (hours, mins, secs)
  68
  69     @staticmethod
  70     def calc_percent(byte_counter, data_len):
  71         if data_len is None:
  72             return None
  73         return float(byte_counter) / float(data_len) * 100.0
  74
  75     @staticmethod
  76     def format_percent(percent):
  77         if percent is None:
  78             return '---.-%'
  79         return '%6s' % ('%3.1f%%' % percent)
  80
  81     @staticmethod
  82     def calc_eta(start, now, total, current):
  83         if total is None:
  84             return None
  85         if now is None:
  86             now = time.time()
  87         dif = now - start
  88         if current == 0 or dif < 0.001:  # One millisecond
  89             return None
  90         rate = float(current) / dif
  91         return int((float(total) - float(current)) / rate)
  92
  93     @staticmethod
  94     def format_eta(eta):
  95         if eta is None:
  96             return '--:--'
  97         return FileDownloader.format_seconds(eta)
  98
  99     @staticmethod
 100     def calc_speed(start, now, bytes):
 101         dif = now - start
 102         if bytes == 0 or dif < 0.001:  # One millisecond
 103             return None
 104         return float(bytes) / dif
 105
 106     @staticmethod
 107     def format_speed(speed):
 108         if speed is None:
 109             return '%10s' % '---b/s'
 110         return '%10s' % ('%s/s' % format_bytes(speed))
 111
 112     @staticmethod
 113     def best_block_size(elapsed_time, bytes):
 114         new_min = max(bytes / 2.0, 1.0)
 115         new_max = min(max(bytes * 2.0, 1.0), 4194304)  # Do not surpass 4 MB
 116         if elapsed_time < 0.001:
 117             return int(new_max)
 118         rate = bytes / elapsed_time
 119         if rate > new_max:
 120             return int(new_max)
 121         if rate < new_min:
 122             return int(new_min)
 123         return int(rate)
 124
 125     @staticmethod
 126     def parse_bytes(bytestr):
 127         """Parse a string indicating a byte quantity into an integer."""
 128         matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr)
 129         if matchobj is None:
 130             return None
 131         number = float(matchobj.group(1))
 132         multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower())
 133         return int(round(number * multiplier))
 134
 135     def to_screen(self, *args, **kargs):
 136         self.ydl.to_screen(*args, **kargs)
 137
 138     def to_stderr(self, message):
 139         self.ydl.to_screen(message)
 140
 141     def to_console_title(self, message):
 142         self.ydl.to_console_title(message)
 143
 144     def trouble(self, *args, **kargs):
 145         self.ydl.trouble(*args, **kargs)
 146
 147     def report_warning(self, *args, **kargs):
 148         self.ydl.report_warning(*args, **kargs)
 149
 150     def report_error(self, *args, **kargs):
 151         self.ydl.report_error(*args, **kargs)
 152
 153     def slow_down(self, start_time, now, byte_counter):
 154         """Sleep if the download speed is over the rate limit."""
 155         rate_limit = self.params.get('ratelimit', None)
 156         if rate_limit is None or byte_counter == 0:
 157             return
 158         if now is None:
 159             now = time.time()
 160         elapsed = now - start_time
 161         if elapsed <= 0.0:
 162             return
 163         speed = float(byte_counter) / elapsed
 164         if speed > rate_limit:
 165             time.sleep(max((byte_counter // rate_limit) - elapsed, 0))
 166
 167     def temp_name(self, filename):
 168         """Returns a temporary filename for the given filename."""
 169         if self.params.get('nopart', False) or filename == '-' or \
 170                 (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))):
 171             return filename
 172         return filename + '.part'
 173
 174     def undo_temp_name(self, filename):
 175         if filename.endswith('.part'):
 176             return filename[:-len('.part')]
 177         return filename
 178
 179     def try_rename(self, old_filename, new_filename):
 180         try:
 181             if old_filename == new_filename:
 182                 return
 183             os.rename(encodeFilename(old_filename), encodeFilename(new_filename))
 184         except (IOError, OSError) as err:
 185             self.report_error('unable to rename file: %s' % compat_str(err))
 186
 187     def try_utime(self, filename, last_modified_hdr):
 188         """Try to set the last-modified time of the given file."""
 189         if last_modified_hdr is None:
 190             return
 191         if not os.path.isfile(encodeFilename(filename)):
 192             return
 193         timestr = last_modified_hdr
 194         if timestr is None:
 195             return
 196         filetime = timeconvert(timestr)
 197         if filetime is None:
 198             return filetime
 199         # Ignore obviously invalid dates
 200         if filetime == 0:
 201             return
 202         try:
 203             os.utime(filename, (time.time(), filetime))
 204         except:
 205             pass
 206         return filetime
 207
 208     def report_destination(self, filename):
 209         """Report destination filename."""
 210         self.to_screen('[download] Destination: ' + filename)
 211
 212     def _report_progress_status(self, msg, is_last_line=False):
 213         fullmsg = '[download] ' + msg
 214         if self.params.get('progress_with_newline', False):
 215             self.to_screen(fullmsg)
 216         else:
 217             if os.name == 'nt':
 218                 prev_len = getattr(self, '_report_progress_prev_line_length',
 219                                    0)
 220                 if prev_len > len(fullmsg):
 221                     fullmsg += ' ' * (prev_len - len(fullmsg))
 222                 self._report_progress_prev_line_length = len(fullmsg)
 223                 clear_line = '\r'
 224             else:
 225                 clear_line = ('\r\x1b[K' if sys.stderr.isatty() else '\r')
 226             self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line)
 227         self.to_console_title('youtube-dl ' + msg)
 228
 229     def report_progress(self, percent, data_len_str, speed, eta):
 230         """Report download progress."""
 231         if self.params.get('noprogress', False):
 232             return
 233         if eta is not None:
 234             eta_str = self.format_eta(eta)
 235         else:
 236             eta_str = 'Unknown ETA'
 237         if percent is not None:
 238             percent_str = self.format_percent(percent)
 239         else:
 240             percent_str = 'Unknown %'
 241         speed_str = self.format_speed(speed)
 242
 243         msg = ('%s of %s at %s ETA %s' %
 244                (percent_str, data_len_str, speed_str, eta_str))
 245         self._report_progress_status(msg)
 246
 247     def report_progress_live_stream(self, downloaded_data_len, speed, elapsed):
 248         if self.params.get('noprogress', False):
 249             return
 250         downloaded_str = format_bytes(downloaded_data_len)
 251         speed_str = self.format_speed(speed)
 252         elapsed_str = FileDownloader.format_seconds(elapsed)
 253         msg = '%s at %s (%s)' % (downloaded_str, speed_str, elapsed_str)
 254         self._report_progress_status(msg)
 255
 256     def report_finish(self, data_len_str, tot_time):
 257         """Report download finished."""
 258         if self.params.get('noprogress', False):
 259             self.to_screen('[download] Download completed')
 260         else:
 261             self._report_progress_status(
 262                 ('100%% of %s in %s' %
 263                  (data_len_str, self.format_seconds(tot_time))),
 264                 is_last_line=True)
 265
 266     def report_resuming_byte(self, resume_len):
 267         """Report attempt to resume at given byte."""
 268         self.to_screen('[download] Resuming download at byte %s' % resume_len)
 269
 270     def report_retry(self, count, retries):
 271         """Report retry in case of HTTP error 5xx"""
 272         self.to_screen('[download] Got server HTTP error. Retrying (attempt %d of %d)...' % (count, retries))
 273
 274     def report_file_already_downloaded(self, file_name):
 275         """Report file has already been fully downloaded."""
 276         try:
 277             self.to_screen('[download] %s has already been downloaded' % file_name)
 278         except UnicodeEncodeError:
 279             self.to_screen('[download] The file has already been downloaded')
 280
 281     def report_unable_to_resume(self):
 282         """Report it was impossible to resume download."""
 283         self.to_screen('[download] Unable to resume')
 284
 285     def download(self, filename, info_dict):
 286         """Download to a filename using the info from info_dict
 287         Return True on success and False otherwise
 288         """
 289
 290         nooverwrites_and_exists = (
 291             self.params.get('nooverwrites', False)
 292             and os.path.exists(encodeFilename(filename))
 293         )
 294
 295         continuedl_and_exists = (
 296             self.params.get('continuedl', False)
 297             and os.path.isfile(encodeFilename(filename))
 298             and not self.params.get('nopart', False)
 299         )
 300
 301         # Check file already present
 302         if filename != '-' and nooverwrites_and_exists or continuedl_and_exists:
 303             self.report_file_already_downloaded(filename)
 304             self._hook_progress({
 305                 'filename': filename,
 306                 'status': 'finished',
 307                 'total_bytes': os.path.getsize(encodeFilename(filename)),
 308             })
 309             return True
 310
 311         sleep_interval = self.params.get('sleep_interval')
 312         if sleep_interval:
 313             self.to_screen('[download] Sleeping %s seconds...' % sleep_interval)
 314             time.sleep(sleep_interval)
 315
 316         return self.real_download(filename, info_dict)
 317
 318     def real_download(self, filename, info_dict):
 319         """Real download process. Redefine in subclasses."""
 320         raise NotImplementedError('This method must be implemented by subclasses')
 321
 322     def _hook_progress(self, status):
 323         for ph in self._progress_hooks:
 324             ph(status)
 325
 326     def add_progress_hook(self, ph):
 327         # See YoutubeDl.py (search for progress_hooks) for a description of
 328         # this interface
 329         self._progress_hooks.append(ph)
 330
 331     def _debug_cmd(self, args, subprocess_encoding, exe=None):
 332         if not self.params.get('verbose', False):
 333             return
 334
 335         if exe is None:
 336             exe = os.path.basename(args[0])
 337
 338         if subprocess_encoding:
 339             str_args = [
 340                 a.decode(subprocess_encoding) if isinstance(a, bytes) else a
 341                 for a in args]
 342         else:
 343             str_args = args
 344         try:
 345             import pipes
 346             shell_quote = lambda args: ' '.join(map(pipes.quote, str_args))
 347         except ImportError:
 348             shell_quote = repr
 349         self.to_screen('[debug] %s command line: %s' % (
 350             exe, shell_quote(str_args)))