from __future__ import unicode_literals import os import ssl import time import random from .common import FileDownloader from ..compat import ( compat_urllib_error, compat_http_client ) from ..utils import ( ContentTooShortError, encodeFilename, int_or_none, parse_http_range, sanitized_Request, ThrottledDownload, try_call, write_xattr, XAttrMetadataError, XAttrUnavailableError, ) RESPONSE_READ_EXCEPTIONS = (TimeoutError, ConnectionError, ssl.SSLError, compat_http_client.HTTPException) class HttpFD(FileDownloader): def real_download(self, filename, info_dict): url = info_dict['url'] request_data = info_dict.get('request_data', None) class DownloadContext(dict): __getattr__ = dict.get __setattr__ = dict.__setitem__ __delattr__ = dict.__delitem__ ctx = DownloadContext() ctx.filename = filename ctx.tmpfilename = self.temp_name(filename) ctx.stream = None # Do not include the Accept-Encoding header headers = {'Youtubedl-no-compression': 'True'} add_headers = info_dict.get('http_headers') if add_headers: headers.update(add_headers) is_test = self.params.get('test', False) chunk_size = self._TEST_FILE_SIZE if is_test else ( self.params.get('http_chunk_size') or info_dict.get('downloader_options', {}).get('http_chunk_size') or 0) ctx.open_mode = 'wb' ctx.resume_len = 0 ctx.block_size = self.params.get('buffersize', 1024) ctx.start_time = time.time() # parse given Range req_start, req_end, _ = parse_http_range(headers.get('Range')) if self.params.get('continuedl', True): # Establish possible resume length if os.path.isfile(encodeFilename(ctx.tmpfilename)): ctx.resume_len = os.path.getsize( encodeFilename(ctx.tmpfilename)) ctx.is_resume = ctx.resume_len > 0 count = 0 retries = self.params.get('retries', 0) class SucceedDownload(Exception): pass class RetryDownload(Exception): def __init__(self, source_error): self.source_error = source_error class NextFragment(Exception): pass def establish_connection(): ctx.chunk_size = (random.randint(int(chunk_size * 0.95), chunk_size) if not is_test and chunk_size else chunk_size) if ctx.resume_len > 0: range_start = ctx.resume_len if req_start is not None: # offset the beginning of Range to be within request range_start += req_start if ctx.is_resume: self.report_resuming_byte(ctx.resume_len) ctx.open_mode = 'ab' elif req_start is not None: range_start = req_start elif ctx.chunk_size > 0: range_start = 0 else: range_start = None ctx.is_resume = False if ctx.chunk_size: chunk_aware_end = range_start + ctx.chunk_size - 1 # we're not allowed to download outside Range range_end = chunk_aware_end if req_end is None else min(chunk_aware_end, req_end) elif req_end is not None: # there's no need for chunked downloads, so download until the end of Range range_end = req_end else: range_end = None if try_call(lambda: range_start > range_end): ctx.resume_len = 0 ctx.open_mode = 'wb' raise RetryDownload(Exception(f'Conflicting range. (start={range_start} > end={range_end})')) if try_call(lambda: range_end >= ctx.content_len): range_end = ctx.content_len - 1 request = sanitized_Request(url, request_data, headers) has_range = range_start is not None if has_range: request.add_header('Range', f'bytes={int(range_start)}-{int_or_none(range_end) or ""}') # Establish connection try: ctx.data = self.ydl.urlopen(request) # When trying to resume, Content-Range HTTP header of response has to be checked # to match the value of requested Range HTTP header. This is due to a webservers # that don't support resuming and serve a whole file with no Content-Range # set in response despite of requested Range (see # https://github.com/ytdl-org/youtube-dl/issues/6057#issuecomment-126129799) if has_range: content_range = ctx.data.headers.get('Content-Range') content_range_start, content_range_end, content_len = parse_http_range(content_range) if content_range_start is not None and range_start == content_range_start: # Content-Range is present and matches requested Range, resume is possible accept_content_len = ( # Non-chunked download not ctx.chunk_size # Chunked download and requested piece or # its part is promised to be served or content_range_end == range_end or content_len < range_end) if accept_content_len: ctx.content_len = content_len ctx.data_len = min(content_len, req_end or content_len) - (req_start or 0) return # Content-Range is either not present or invalid. Assuming remote webserver is # trying to send the whole file, resume is not possible, so wiping the local file # and performing entire redownload self.report_unable_to_resume() ctx.resume_len = 0 ctx.open_mode = 'wb' ctx.data_len = ctx.content_len = int_or_none(ctx.data.info().get('Content-length', None)) except (compat_urllib_error.HTTPError, ) as err: if err.code == 416: # Unable to resume (requested range not satisfiable) try: # Open the connection again without the range header ctx.data = self.ydl.urlopen( sanitized_Request(url, request_data, headers)) content_length = ctx.data.info()['Content-Length'] except (compat_urllib_error.HTTPError, ) as err: if err.code < 500 or err.code >= 600: raise else: # Examine the reported length if (content_length is not None and (ctx.resume_len - 100 < int(content_length) < ctx.resume_len + 100)): # The file had already been fully downloaded. # Explanation to the above condition: in issue #175 it was revealed that # YouTube sometimes adds or removes a few bytes from the end of the file, # changing the file size slightly and causing problems for some users. So # I decided to implement a suggested change and consider the file # completely downloaded if the file size differs less than 100 bytes from # the one in the hard drive. self.report_file_already_downloaded(ctx.filename) self.try_rename(ctx.tmpfilename, ctx.filename) self._hook_progress({ 'filename': ctx.filename, 'status': 'finished', 'downloaded_bytes': ctx.resume_len, 'total_bytes': ctx.resume_len, }, info_dict) raise SucceedDownload() else: # The length does not match, we start the download over self.report_unable_to_resume() ctx.resume_len = 0 ctx.open_mode = 'wb' return elif err.code < 500 or err.code >= 600: # Unexpected HTTP error raise raise RetryDownload(err) except compat_urllib_error.URLError as err: if isinstance(err.reason, ssl.CertificateError): raise raise RetryDownload(err) # In urllib.request.AbstractHTTPHandler, the response is partially read on request. # Any errors that occur during this will not be wrapped by URLError except RESPONSE_READ_EXCEPTIONS as err: raise RetryDownload(err) def download(): data_len = ctx.data.info().get('Content-length', None) # Range HTTP header may be ignored/unsupported by a webserver # (e.g. extractor/scivee.py, extractor/bambuser.py). # However, for a test we still would like to download just a piece of a file. # To achieve this we limit data_len to _TEST_FILE_SIZE and manually control # block size when downloading a file. if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE): data_len = self._TEST_FILE_SIZE if data_len is not None: data_len = int(data_len) + ctx.resume_len min_data_len = self.params.get('min_filesize') max_data_len = self.params.get('max_filesize') if min_data_len is not None and data_len < min_data_len: self.to_screen('\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len)) return False if max_data_len is not None and data_len > max_data_len: self.to_screen('\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len)) return False byte_counter = 0 + ctx.resume_len block_size = ctx.block_size start = time.time() # measure time over whole while-loop, so slow_down() and best_block_size() work together properly now = None # needed for slow_down() in the first loop run before = start # start measuring def retry(e): to_stdout = ctx.tmpfilename == '-' if ctx.stream is not None: if not to_stdout: ctx.stream.close() ctx.stream = None ctx.resume_len = byte_counter if to_stdout else os.path.getsize(encodeFilename(ctx.tmpfilename)) raise RetryDownload(e) while True: try: # Download and write data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter)) except RESPONSE_READ_EXCEPTIONS as err: retry(err) byte_counter += len(data_block) # exit loop when download is finished if len(data_block) == 0: break # Open destination file just in time if ctx.stream is None: try: ctx.stream, ctx.tmpfilename = self.sanitize_open( ctx.tmpfilename, ctx.open_mode) assert ctx.stream is not None ctx.filename = self.undo_temp_name(ctx.tmpfilename) self.report_destination(ctx.filename) except (OSError, IOError) as err: self.report_error('unable to open for writing: %s' % str(err)) return False if self.params.get('xattr_set_filesize', False) and data_len is not None: try: write_xattr(ctx.tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8')) except (XAttrUnavailableError, XAttrMetadataError) as err: self.report_error('unable to set filesize xattr: %s' % str(err)) try: ctx.stream.write(data_block) except (IOError, OSError) as err: self.to_stderr('\n') self.report_error('unable to write data: %s' % str(err)) return False # Apply rate limit self.slow_down(start, now, byte_counter - ctx.resume_len) # end measuring of one loop run now = time.time() after = now # Adjust block size if not self.params.get('noresizebuffer', False): block_size = self.best_block_size(after - before, len(data_block)) before = after # Progress message speed = self.calc_speed(start, now, byte_counter - ctx.resume_len) if ctx.data_len is None: eta = None else: eta = self.calc_eta(start, time.time(), ctx.data_len - ctx.resume_len, byte_counter - ctx.resume_len) self._hook_progress({ 'status': 'downloading', 'downloaded_bytes': byte_counter, 'total_bytes': ctx.data_len, 'tmpfilename': ctx.tmpfilename, 'filename': ctx.filename, 'eta': eta, 'speed': speed, 'elapsed': now - ctx.start_time, 'ctx_id': info_dict.get('ctx_id'), }, info_dict) if data_len is not None and byte_counter == data_len: break if speed and speed < (self.params.get('throttledratelimit') or 0): # The speed must stay below the limit for 3 seconds # This prevents raising error when the speed temporarily goes down if ctx.throttle_start is None: ctx.throttle_start = now elif now - ctx.throttle_start > 3: if ctx.stream is not None and ctx.tmpfilename != '-': ctx.stream.close() raise ThrottledDownload() elif speed: ctx.throttle_start = None if not is_test and ctx.chunk_size and ctx.content_len is not None and byte_counter < ctx.content_len: ctx.resume_len = byte_counter # ctx.block_size = block_size raise NextFragment() if ctx.stream is None: self.to_stderr('\n') self.report_error('Did not get any data blocks') return False if ctx.tmpfilename != '-': ctx.stream.close() if data_len is not None and byte_counter != data_len: err = ContentTooShortError(byte_counter, int(data_len)) if count <= retries: retry(err) raise err self.try_rename(ctx.tmpfilename, ctx.filename) # Update file modification time if self.params.get('updatetime', True): info_dict['filetime'] = self.try_utime(ctx.filename, ctx.data.info().get('last-modified', None)) self._hook_progress({ 'downloaded_bytes': byte_counter, 'total_bytes': byte_counter, 'filename': ctx.filename, 'status': 'finished', 'elapsed': time.time() - ctx.start_time, 'ctx_id': info_dict.get('ctx_id'), }, info_dict) return True while count <= retries: try: establish_connection() return download() except RetryDownload as e: count += 1 if count <= retries: self.report_retry(e.source_error, count, retries) else: self.to_screen(f'[download] Got server HTTP error: {e.source_error}') continue except NextFragment: continue except SucceedDownload: return True self.report_error('giving up after %s retries' % retries) return False