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from __future__ import unicode_literals
import errnoimport osimport socketimport timeimport re
from .common import FileDownloaderfrom ..compat import compat_urllib_errorfrom ..utils import ( ContentTooShortError, encodeFilename, sanitize_open, sanitized_Request,)
class HttpFD(FileDownloader): def real_download(self, filename, info_dict): url = info_dict['url'] tmpfilename = self.temp_name(filename) 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) basic_request = sanitized_Request(url, None, headers) request = sanitized_Request(url, None, headers)
is_test = self.params.get('test', False)
if is_test: request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))
# Establish possible resume length if os.path.isfile(encodeFilename(tmpfilename)): resume_len = os.path.getsize(encodeFilename(tmpfilename)) else: resume_len = 0
open_mode = 'wb' if resume_len != 0: if self.params.get('continuedl', True): self.report_resuming_byte(resume_len) request.add_header('Range', 'bytes=%d-' % resume_len) open_mode = 'ab' else: resume_len = 0
count = 0 retries = self.params.get('retries', 0) while count <= retries: # Establish connection try: 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/rg3/youtube-dl/issues/6057#issuecomment-126129799) if resume_len > 0: content_range = data.headers.get('Content-Range') if content_range: content_range_m = re.search(r'bytes (\d+)-', content_range) # Content-Range is present and matches requested Range, resume is possible if content_range_m and resume_len == int(content_range_m.group(1)): break # 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() resume_len = 0 open_mode = 'wb' break except (compat_urllib_error.HTTPError, ) as err: if (err.code < 500 or err.code >= 600) and err.code != 416: # Unexpected HTTP error raise elif err.code == 416: # Unable to resume (requested range not satisfiable) try: # Open the connection again without the range header data = self.ydl.urlopen(basic_request) content_length = 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 (resume_len - 100 < int(content_length) < 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(filename) self.try_rename(tmpfilename, filename) self._hook_progress({ 'filename': filename, 'status': 'finished', 'downloaded_bytes': resume_len, 'total_bytes': resume_len, }) return True else: # The length does not match, we start the download over self.report_unable_to_resume() resume_len = 0 open_mode = 'wb' break except socket.error as e: if e.errno != errno.ECONNRESET: # Connection reset is no problem, just retry raise
# Retry count += 1 if count <= retries: self.report_retry(count, retries)
if count > retries: self.report_error('giving up after %s retries' % retries) return False
data_len = 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) + 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 + resume_len block_size = self.params.get('buffersize', 1024) 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 while True:
# Download and write data_block = data.read(block_size if not is_test else min(block_size, data_len - byte_counter)) byte_counter += len(data_block)
# exit loop when download is finished if len(data_block) == 0: break
# Open destination file just in time if stream is None: try: (stream, tmpfilename) = sanitize_open(tmpfilename, open_mode) assert stream is not None filename = self.undo_temp_name(tmpfilename) self.report_destination(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: import xattr xattr.setxattr(tmpfilename, 'user.ytdl.filesize', str(data_len)) except(OSError, IOError, ImportError) as err: self.report_error('unable to set filesize xattr: %s' % str(err))
try: 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 - 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 - resume_len) if data_len is None: eta = None else: eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
self._hook_progress({ 'status': 'downloading', 'downloaded_bytes': byte_counter, 'total_bytes': data_len, 'tmpfilename': tmpfilename, 'filename': filename, 'eta': eta, 'speed': speed, 'elapsed': now - start, })
if is_test and byte_counter == data_len: break
if stream is None: self.to_stderr('\n') self.report_error('Did not get any data blocks') return False if tmpfilename != '-': stream.close()
if data_len is not None and byte_counter != data_len: raise ContentTooShortError(byte_counter, int(data_len)) self.try_rename(tmpfilename, filename)
# Update file modification time if self.params.get('updatetime', True): info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
self._hook_progress({ 'downloaded_bytes': byte_counter, 'total_bytes': byte_counter, 'filename': filename, 'status': 'finished', 'elapsed': time.time() - start, })
return True
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