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 """ 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) def _read_ytdl_file(self, ctx): stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'r') ctx['fragment_index'] = json.loads(stream.read())['download']['current_fragment_index'] stream.close() def _write_ytdl_file(self, ctx): frag_index_stream, _ = sanitize_open(self.ytdl_filename(ctx['filename']), 'w') frag_index_stream.write(json.dumps({ 'download': { 'current_fragment_index': ctx['fragment_index'] }, })) 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']) success = ctx['dl'].download(fragment_filename, { 'url': frag_url, 'http_headers': headers or info_dict.get('http_headers'), }) if not success: return False, None 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) finally: if not (ctx.get('live') or ctx['tmpfilename'] == '-'): self._write_ytdl_file(ctx) if not self.params.get('keep_fragments', False): os.remove(ctx['fragment_filename_sanitized']) del ctx['fragment_filename_sanitized'] def _prepare_frag_download(self, ctx): if 'live' not in ctx: ctx['live'] = False self.to_screen( '[%s] Total fragments: %s' % (self.FD_NAME, ctx['total_frags'] if not ctx['live'] else 'unknown (live)')) 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)) ctx['fragment_index'] = 0 if os.path.isfile(encodeFilename(self.ytdl_filename(ctx['filename']))): self._read_ytdl_file(ctx) else: self._write_ytdl_file(ctx) if ctx['fragment_index'] > 0: assert resume_len > 0 else: assert resume_len == 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): total_frags = ctx['total_frags'] # This dict stores the download progress, it's updated by the progress # hook state = { 'status': 'downloading', 'downloaded_bytes': ctx['complete_frags_downloaded_bytes'], '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, state['downloaded_bytes']) 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() ytdl_filename = encodeFilename(self.ytdl_filename(ctx['filename'])) if os.path.isfile(ytdl_filename): os.remove(ytdl_filename) elapsed = time.time() - ctx['started'] self.try_rename(ctx['tmpfilename'], ctx['filename']) fsize = os.path.getsize(encodeFilename(ctx['filename'])) self._hook_progress({ 'downloaded_bytes': fsize, 'total_bytes': fsize, 'filename': ctx['filename'], 'status': 'finished', 'elapsed': elapsed, })