from __future__ import division, unicode_literals import os import time import json from .common import FileDownloader from .http import HttpFD from ..utils import ( error_to_compat_str, encodeFilename, sanitize_open, sanitized_Request, ) class HttpQuietDownloader(HttpFD): def to_screen(self, *args, **kargs): pass class FragmentFD(FileDownloader): """ A base file downloader class for fragmented media (e.g. f4m/m3u8 manifests). Available options: fragment_retries: Number of times to retry a fragment for HTTP error (DASH and hlsnative only) skip_unavailable_fragments: Skip unavailable fragments (DASH and hlsnative only) keep_fragments: Keep downloaded fragments on disk after downloading is finished For each incomplete fragment download youtube-dlc keeps on disk a special bookkeeping file with download state and metadata (in future such files will be used for any incomplete download handled by youtube-dlc). This file is used to properly handle resuming, check download file consistency and detect potential errors. The file has a .ytdl extension and represents a standard JSON file of the following format: extractor: Dictionary of extractor related data. TBD. downloader: Dictionary of downloader related data. May contain following data: current_fragment: Dictionary with current (being downloaded) fragment data: index: 0-based index of current fragment among all fragments fragment_count: Total count of fragments This feature is experimental and file format may change in future. """ def report_retry_fragment(self, err, frag_index, count, retries): self.to_screen( '[download] Got server HTTP error: %s. Retrying fragment %d (attempt %d of %s)...' % (error_to_compat_str(err), frag_index, count, self.format_retries(retries))) def report_skip_fragment(self, frag_index): self.to_screen('[download] Skipping fragment %d...' % frag_index) def _prepare_url(self, info_dict, url): headers = info_dict.get('http_headers') return sanitized_Request(url, None, headers) if headers else url def _prepare_and_start_frag_download(self, ctx): self._prepare_frag_download(ctx) self._start_frag_download(ctx) @staticmethod def __do_ytdl_file(ctx): return not ctx['live'] and not ctx['tmpfilename'] == '-' def _read_ytdl_file(self, ctx): assert 'ytdl_corrupt' not in ctx stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r') try: ctx['fragment_index'] = json.loads(stream.read())['downloader']['current_fragment']['index'] except Exception: ctx['ytdl_corrupt'] = True finally: stream.close() def _write_ytdl_file(self, ctx): frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w') downloader = { 'current_fragment': { 'index': ctx['fragment_index'], }, } if ctx.get('fragment_count') is not None: downloader['fragment_count'] = ctx['fragment_count'] frag_index_stream.write(json.dumps({'downloader': downloader})) frag_index_stream.close() def _download_fragment(self, ctx, frag_url, info_dict, headers=None): fragment_filename = '%s-Frag%d' % (ctx['tmpfilename'], ctx['fragment_index']) fragment_info_dict = { 'url': frag_url, 'http_headers': headers or info_dict.get('http_headers'), } success = ctx['dl'].download(fragment_filename, fragment_info_dict) if not success: return False, None if fragment_info_dict.get('filetime'): ctx['fragment_filetime'] = fragment_info_dict.get('filetime') down, frag_sanitized = sanitize_open(fragment_filename, 'rb') ctx['fragment_filename_sanitized'] = frag_sanitized frag_content = down.read() down.close() return True, frag_content def _append_fragment(self, ctx, frag_content): try: ctx['dest_stream'].write(frag_content) ctx['dest_stream'].flush() finally: if self.__do_ytdl_file(ctx): self._write_ytdl_file(ctx) if not self.params.get('keep_fragments', False): os.remove(encodeFilename(ctx['fragment_filename_sanitized'])) del ctx['fragment_filename_sanitized'] def _prepare_frag_download(self, ctx): if 'live' not in ctx: ctx['live'] = False if not ctx['live']: total_frags_str = '%d' % ctx['total_frags'] ad_frags = ctx.get('ad_frags', 0) if ad_frags: total_frags_str += ' (not including %d ad)' % ad_frags else: total_frags_str = 'unknown (live)' self.to_screen( '[%s] Total fragments: %s' % (self.FD_NAME, total_frags_str)) self.report_destination(ctx['filename']) dl = HttpQuietDownloader( self.ydl, { 'continuedl': True, 'quiet': True, 'noprogress': True, 'ratelimit': self.params.get('ratelimit'), 'retries': self.params.get('retries', 0), 'nopart': self.params.get('nopart', False), 'test': self.params.get('test', False), } ) tmpfilename = self.temp_name(ctx['filename']) open_mode = 'wb' resume_len = 0 # Establish possible resume length if os.path.isfile(encodeFilename(tmpfilename)): open_mode = 'ab' resume_len = os.path.getsize(encodeFilename(tmpfilename)) # Should be initialized before ytdl file check ctx.update({ 'tmpfilename': tmpfilename, 'fragment_index': 0, }) if self.__do_ytdl_file(ctx): if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))): self._read_ytdl_file(ctx) is_corrupt = ctx.get('ytdl_corrupt') is True is_inconsistent = ctx['fragment_index'] > 0 and resume_len == 0 if is_corrupt or is_inconsistent: message = ( '.ytdl file is corrupt' if is_corrupt else 'Inconsistent state of incomplete fragment download') self.report_warning( '%s. Restarting from the beginning...' % message) ctx['fragment_index'] = resume_len = 0 if 'ytdl_corrupt' in ctx: del ctx['ytdl_corrupt'] self._write_ytdl_file(ctx) else: self._write_ytdl_file(ctx) assert ctx['fragment_index'] == 0 dest_stream, tmpfilename = sanitize_open(tmpfilename, open_mode) ctx.update({ 'dl': dl, 'dest_stream': dest_stream, 'tmpfilename': tmpfilename, # Total complete fragments downloaded so far in bytes 'complete_frags_downloaded_bytes': resume_len, }) def _start_frag_download(self, ctx): resume_len = ctx['complete_frags_downloaded_bytes'] total_frags = ctx['total_frags'] # This dict stores the download progress, it's updated by the progress # hook state = { 'status': 'downloading', 'downloaded_bytes': resume_len, 'fragment_index': ctx['fragment_index'], 'fragment_count': total_frags, 'filename': ctx['filename'], 'tmpfilename': ctx['tmpfilename'], } start = time.time() ctx.update({ 'started': start, # Amount of fragment's bytes downloaded by the time of the previous # frag progress hook invocation 'prev_frag_downloaded_bytes': 0, }) def frag_progress_hook(s): if s['status'] not in ('downloading', 'finished'): return time_now = time.time() state['elapsed'] = time_now - start frag_total_bytes = s.get('total_bytes') or 0 if not ctx['live']: estimated_size = ( (ctx['complete_frags_downloaded_bytes'] + frag_total_bytes) / (state['fragment_index'] + 1) * total_frags) state['total_bytes_estimate'] = estimated_size if s['status'] == 'finished': state['fragment_index'] += 1 ctx['fragment_index'] = state['fragment_index'] state['downloaded_bytes'] += frag_total_bytes - ctx['prev_frag_downloaded_bytes'] ctx['complete_frags_downloaded_bytes'] = state['downloaded_bytes'] ctx['prev_frag_downloaded_bytes'] = 0 else: frag_downloaded_bytes = s['downloaded_bytes'] state['downloaded_bytes'] += frag_downloaded_bytes - ctx['prev_frag_downloaded_bytes'] if not ctx['live']: state['eta'] = self.calc_eta( start, time_now, estimated_size - resume_len, state['downloaded_bytes'] - resume_len) state['speed'] = s.get('speed') or ctx.get('speed') ctx['speed'] = state['speed'] ctx['prev_frag_downloaded_bytes'] = frag_downloaded_bytes self._hook_progress(state) ctx['dl'].add_progress_hook(frag_progress_hook) return start def _finish_frag_download(self, ctx): ctx['dest_stream'].close() if self.__do_ytdl_file(ctx): ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename'])) if os.path.isfile(ytdl_filename): os.remove(ytdl_filename) elapsed = time.time() - ctx['started'] if ctx['tmpfilename'] == '-': downloaded_bytes = ctx['complete_frags_downloaded_bytes'] else: self.try_rename(ctx['tmpfilename'], ctx['filename']) if self.params.get('updatetime', True): filetime = ctx.get('fragment_filetime') if filetime: try: os.utime(ctx['filename'], (time.time(), filetime)) except Exception: pass downloaded_bytes = os.path.getsize(encodeFilename(ctx['filename'])) self._hook_progress({ 'downloaded_bytes': downloaded_bytes, 'total_bytes': downloaded_bytes, 'filename': ctx['filename'], 'status': 'finished', 'elapsed': elapsed, })