from __future__ import division, unicode_literals import os import re import sys import time import random import threading from ..compat import ( compat_os_name, compat_urllib_request, ) from ..utils import ( decodeArgument, encodeFilename, error_to_compat_str, format_bytes, shell_quote, timeconvert, ) class FileDownloader(object): """File Downloader class. File downloader objects are the ones responsible of downloading the actual video file and writing it to disk. File downloaders accept a lot of parameters. In order not to saturate the object constructor with arguments, it receives a dictionary of options instead. Available options: verbose: Print additional info to stdout. quiet: Do not print messages to stdout. ratelimit: Download speed limit, in bytes/sec. retries: Number of times to retry for HTTP error 5xx buffersize: Size of download buffer in bytes. noresizebuffer: Do not automatically resize the download buffer. continuedl: Try to continue downloads if possible. noprogress: Do not print the progress bar. logtostderr: Log messages to stderr instead of stdout. consoletitle: Display progress in console window's titlebar. nopart: Do not use temporary .part files. updatetime: Use the Last-modified header to set output file timestamps. test: Download only first bytes to test the downloader. min_filesize: Skip files smaller than this size max_filesize: Skip files larger than this size xattr_set_filesize: Set ytdl.filesize user xattribute with expected size. external_downloader_args: A list of additional command-line arguments for the external downloader. hls_use_mpegts: Use the mpegts container for HLS videos. http_chunk_size: Size of a chunk for chunk-based HTTP downloading. May be useful for bypassing bandwidth throttling imposed by a webserver (experimental) Subclasses of this one must re-define the real_download method. """ _TEST_FILE_SIZE = 10241 params = None def __init__(self, ydl, params): """Create a FileDownloader object with the given options.""" self.ydl = ydl self._progress_hooks = [] self.params = params self.add_progress_hook(self.report_progress) @staticmethod def format_seconds(seconds): (mins, secs) = divmod(seconds, 60) (hours, mins) = divmod(mins, 60) if hours > 99: return '--:--:--' if hours == 0: return '%02d:%02d' % (mins, secs) else: return '%02d:%02d:%02d' % (hours, mins, secs) @staticmethod def calc_percent(byte_counter, data_len): if data_len is None: return None return float(byte_counter) / float(data_len) * 100.0 @staticmethod def format_percent(percent): if percent is None: return '---.-%' return '%6s' % ('%3.1f%%' % percent) @staticmethod def calc_eta(start, now, total, current): if total is None: return None if now is None: now = time.time() dif = now - start if current == 0 or dif < 0.001: # One millisecond return None rate = float(current) / dif return int((float(total) - float(current)) / rate) @staticmethod def format_eta(eta): if eta is None: return '--:--' return FileDownloader.format_seconds(eta) @staticmethod def calc_speed(start, now, bytes): dif = now - start if bytes == 0 or dif < 0.001: # One millisecond return None return float(bytes) / dif @staticmethod def format_speed(speed): if speed is None: return '%10s' % '---b/s' return '%10s' % ('%s/s' % format_bytes(speed)) @staticmethod def format_retries(retries): return 'inf' if retries == float('inf') else '%.0f' % retries @staticmethod def best_block_size(elapsed_time, bytes): new_min = max(bytes / 2.0, 1.0) new_max = min(max(bytes * 2.0, 1.0), 4194304) # Do not surpass 4 MB if elapsed_time < 0.001: return int(new_max) rate = bytes / elapsed_time if rate > new_max: return int(new_max) if rate < new_min: return int(new_min) return int(rate) @staticmethod def parse_bytes(bytestr): """Parse a string indicating a byte quantity into an integer.""" matchobj = re.match(r'(?i)^(\d+(?:\.\d+)?)([kMGTPEZY]?)$', bytestr) if matchobj is None: return None number = float(matchobj.group(1)) multiplier = 1024.0 ** 'bkmgtpezy'.index(matchobj.group(2).lower()) return int(round(number * multiplier)) def to_screen(self, *args, **kargs): self.ydl.to_screen(*args, **kargs) def to_stderr(self, message): self.ydl.to_screen(message) def to_console_title(self, message): self.ydl.to_console_title(message) def trouble(self, *args, **kargs): self.ydl.trouble(*args, **kargs) def report_warning(self, *args, **kargs): self.ydl.report_warning(*args, **kargs) def report_error(self, *args, **kargs): self.ydl.report_error(*args, **kargs) def slow_down(self, start_time, now, byte_counter): """Sleep if the download speed is over the rate limit.""" rate_limit = self.params.get('ratelimit') if rate_limit is None or byte_counter == 0: return if now is None: now = time.time() elapsed = now - start_time if elapsed <= 0.0: return speed = float(byte_counter) / elapsed if speed > rate_limit: sleep_time = float(byte_counter) / rate_limit - elapsed if sleep_time > 0: time.sleep(sleep_time) def temp_name(self, filename): """Returns a temporary filename for the given filename.""" if self.params.get('nopart', False) or filename == '-' or \ (os.path.exists(encodeFilename(filename)) and not os.path.isfile(encodeFilename(filename))): return filename return filename + '.part' def undo_temp_name(self, filename): if filename.endswith('.part'): return filename[:-len('.part')] return filename def ytdl_filename(self, filename): return filename + '.ytdl' def try_rename(self, old_filename, new_filename): try: if old_filename == new_filename: return os.rename(encodeFilename(old_filename), encodeFilename(new_filename)) except (IOError, OSError) as err: self.report_error('unable to rename file: %s' % error_to_compat_str(err)) def try_utime(self, filename, last_modified_hdr): """Try to set the last-modified time of the given file.""" if last_modified_hdr is None: return if not os.path.isfile(encodeFilename(filename)): return timestr = last_modified_hdr if timestr is None: return filetime = timeconvert(timestr) if filetime is None: return filetime # Ignore obviously invalid dates if filetime == 0: return try: os.utime(filename, (time.time(), filetime)) except Exception: pass return filetime def report_destination(self, filename): """Report destination filename.""" self.to_screen('[download] Destination: ' + filename) def _report_progress_status(self, msg, is_last_line=False): fullmsg = '[download] ' + msg if self.params.get('progress_with_newline', False): self.to_screen(fullmsg) else: if compat_os_name == 'nt': prev_len = getattr(self, '_report_progress_prev_line_length', 0) if prev_len > len(fullmsg): fullmsg += ' ' * (prev_len - len(fullmsg)) self._report_progress_prev_line_length = len(fullmsg) clear_line = '\r' else: clear_line = ('\r\x1b[K' if sys.stderr.isatty() else '\r') self.to_screen(clear_line + fullmsg, skip_eol=not is_last_line) self.to_console_title('youtube-dl ' + msg) def report_progress(self, s): if s['status'] == 'finished': if self.params.get('noprogress', False): self.to_screen('[download] Download completed') else: msg_template = '100%%' if s.get('total_bytes') is not None: s['_total_bytes_str'] = format_bytes(s['total_bytes']) msg_template += ' of %(_total_bytes_str)s' if s.get('elapsed') is not None: s['_elapsed_str'] = self.format_seconds(s['elapsed']) msg_template += ' in %(_elapsed_str)s' self._report_progress_status( msg_template % s, is_last_line=True) if self.params.get('noprogress'): return if s['status'] != 'downloading': return if s.get('eta') is not None: s['_eta_str'] = self.format_eta(s['eta']) else: s['_eta_str'] = 'Unknown ETA' if s.get('total_bytes') and s.get('downloaded_bytes') is not None: s['_percent_str'] = self.format_percent(100 * s['downloaded_bytes'] / s['total_bytes']) elif s.get('total_bytes_estimate') and s.get('downloaded_bytes') is not None: s['_percent_str'] = self.format_percent(100 * s['downloaded_bytes'] / s['total_bytes_estimate']) else: if s.get('downloaded_bytes') == 0: s['_percent_str'] = self.format_percent(0) else: s['_percent_str'] = 'Unknown %' if s.get('speed') is not None: s['_speed_str'] = self.format_speed(s['speed']) else: s['_speed_str'] = 'Unknown speed' if s.get('total_bytes') is not None: s['_total_bytes_str'] = format_bytes(s['total_bytes']) msg_template = '%(_percent_str)s of %(_total_bytes_str)s at %(_speed_str)s ETA %(_eta_str)s' elif s.get('total_bytes_estimate') is not None: s['_total_bytes_estimate_str'] = format_bytes(s['total_bytes_estimate']) msg_template = '%(_percent_str)s of ~%(_total_bytes_estimate_str)s at %(_speed_str)s ETA %(_eta_str)s' else: if s.get('downloaded_bytes') is not None: s['_downloaded_bytes_str'] = format_bytes(s['downloaded_bytes']) if s.get('elapsed'): s['_elapsed_str'] = self.format_seconds(s['elapsed']) msg_template = '%(_downloaded_bytes_str)s at %(_speed_str)s (%(_elapsed_str)s)' else: msg_template = '%(_downloaded_bytes_str)s at %(_speed_str)s' else: msg_template = '%(_percent_str)s % at %(_speed_str)s ETA %(_eta_str)s' self._report_progress_status(msg_template % s) def report_resuming_byte(self, resume_len): """Report attempt to resume at given byte.""" self.to_screen('[download] Resuming download at byte %s' % resume_len) def report_retry(self, err, count, retries): """Report retry in case of HTTP error 5xx""" self.to_screen( '[download] Got server HTTP error: %s. Retrying (attempt %d of %s)...' % (error_to_compat_str(err), count, self.format_retries(retries))) def report_file_already_downloaded(self, file_name): """Report file has already been fully downloaded.""" try: self.to_screen('[download] %s has already been downloaded' % file_name) except UnicodeEncodeError: self.to_screen('[download] The file has already been downloaded') def report_unable_to_resume(self): """Report it was impossible to resume download.""" self.to_screen('[download] Unable to resume') def download(self, filename, info_dict): """Download to a filename using the info from info_dict Return True on success and False otherwise """ nooverwrites_and_exists = ( self.params.get('nooverwrites', False) and os.path.exists(encodeFilename(filename)) ) if not hasattr(filename, 'write'): continuedl_and_exists = ( self.params.get('continuedl', True) and os.path.isfile(encodeFilename(filename)) and not self.params.get('nopart', False) ) # Check file already present if filename != '-' and (nooverwrites_and_exists or continuedl_and_exists): self.report_file_already_downloaded(filename) self._hook_progress({ 'filename': filename, 'status': 'finished', 'total_bytes': os.path.getsize(encodeFilename(filename)), }) return True min_sleep_interval = self.params.get('sleep_interval') if min_sleep_interval: max_sleep_interval = self.params.get('max_sleep_interval', min_sleep_interval) sleep_interval = random.uniform(min_sleep_interval, max_sleep_interval) self.to_screen( '[download] Sleeping %s seconds...' % ( int(sleep_interval) if sleep_interval.is_integer() else '%.2f' % sleep_interval)) time.sleep(sleep_interval) timer = [None] heartbeat_lock = None download_complete = False if 'heartbeat_url'in info_dict: heartbeat_lock = threading.Lock() heartbeat_url = info_dict['heartbeat_url'] heartbeat_data = info_dict['heartbeat_data'] heartbeat_interval = info_dict.get('heartbeat_interval', 30) self.to_screen('[download] Heartbeat with %s second interval...' % heartbeat_interval) def heartbeat(): try: compat_urllib_request.urlopen(url=heartbeat_url, data=heartbeat_data) except Exception: self.to_screen("[download] Heartbeat failed") with heartbeat_lock: if not download_complete: timer[0] = threading.Timer(heartbeat_interval, heartbeat) timer[0].start() heartbeat() try: return self.real_download(filename, info_dict) finally: if heartbeat_lock: with heartbeat_lock: timer[0].cancel() download_complete = True def real_download(self, filename, info_dict): """Real download process. Redefine in subclasses.""" raise NotImplementedError('This method must be implemented by subclasses') def _hook_progress(self, status): for ph in self._progress_hooks: ph(status) def add_progress_hook(self, ph): # See YoutubeDl.py (search for progress_hooks) for a description of # this interface self._progress_hooks.append(ph) def _debug_cmd(self, args, exe=None): if not self.params.get('verbose', False): return str_args = [decodeArgument(a) for a in args] if exe is None: exe = os.path.basename(str_args[0]) self.to_screen('[debug] %s command line: %s' % ( exe, shell_quote(str_args)))