206 lines
8.5 KiB
Python
206 lines
8.5 KiB
Python
import os
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import time
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from .common import FileDownloader
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from ..utils import (
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compat_urllib_request,
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compat_urllib_error,
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ContentTooShortError,
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encodeFilename,
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sanitize_open,
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format_bytes,
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)
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class HttpFD(FileDownloader):
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_TEST_FILE_SIZE = 10241
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def real_download(self, filename, info_dict):
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url = info_dict['url']
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tmpfilename = self.temp_name(filename)
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stream = None
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# Do not include the Accept-Encoding header
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headers = {'Youtubedl-no-compression': 'True'}
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if 'user_agent' in info_dict:
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headers['Youtubedl-user-agent'] = info_dict['user_agent']
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if 'http_referer' in info_dict:
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headers['Referer'] = info_dict['http_referer']
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basic_request = compat_urllib_request.Request(url, None, headers)
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request = compat_urllib_request.Request(url, None, headers)
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is_test = self.params.get('test', False)
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if is_test:
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request.add_header('Range', 'bytes=0-%s' % str(self._TEST_FILE_SIZE - 1))
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# Establish possible resume length
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if os.path.isfile(encodeFilename(tmpfilename)):
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resume_len = os.path.getsize(encodeFilename(tmpfilename))
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else:
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resume_len = 0
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open_mode = 'wb'
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if resume_len != 0:
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if self.params.get('continuedl', False):
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self.report_resuming_byte(resume_len)
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request.add_header('Range', 'bytes=%d-' % resume_len)
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open_mode = 'ab'
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else:
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resume_len = 0
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count = 0
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retries = self.params.get('retries', 0)
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while count <= retries:
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# Establish connection
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try:
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data = self.ydl.urlopen(request)
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break
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except (compat_urllib_error.HTTPError, ) as err:
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if (err.code < 500 or err.code >= 600) and err.code != 416:
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# Unexpected HTTP error
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raise
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elif err.code == 416:
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# Unable to resume (requested range not satisfiable)
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try:
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# Open the connection again without the range header
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data = self.ydl.urlopen(basic_request)
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content_length = data.info()['Content-Length']
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except (compat_urllib_error.HTTPError, ) as err:
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if err.code < 500 or err.code >= 600:
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raise
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else:
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# Examine the reported length
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if (content_length is not None and
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(resume_len - 100 < int(content_length) < resume_len + 100)):
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# The file had already been fully downloaded.
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# Explanation to the above condition: in issue #175 it was revealed that
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# YouTube sometimes adds or removes a few bytes from the end of the file,
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# changing the file size slightly and causing problems for some users. So
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# I decided to implement a suggested change and consider the file
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# completely downloaded if the file size differs less than 100 bytes from
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# the one in the hard drive.
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self.report_file_already_downloaded(filename)
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self.try_rename(tmpfilename, filename)
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self._hook_progress({
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'filename': filename,
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'status': 'finished',
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})
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return True
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else:
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# The length does not match, we start the download over
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self.report_unable_to_resume()
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resume_len = 0
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open_mode = 'wb'
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break
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# Retry
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count += 1
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if count <= retries:
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self.report_retry(count, retries)
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if count > retries:
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self.report_error(u'giving up after %s retries' % retries)
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return False
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data_len = data.info().get('Content-length', None)
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# Range HTTP header may be ignored/unsupported by a webserver
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# (e.g. extractor/scivee.py, extractor/bambuser.py).
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# However, for a test we still would like to download just a piece of a file.
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# To achieve this we limit data_len to _TEST_FILE_SIZE and manually control
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# block size when downloading a file.
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if is_test and (data_len is None or int(data_len) > self._TEST_FILE_SIZE):
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data_len = self._TEST_FILE_SIZE
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if data_len is not None:
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data_len = int(data_len) + resume_len
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min_data_len = self.params.get("min_filesize", None)
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max_data_len = self.params.get("max_filesize", None)
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if min_data_len is not None and data_len < min_data_len:
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self.to_screen(u'\r[download] File is smaller than min-filesize (%s bytes < %s bytes). Aborting.' % (data_len, min_data_len))
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return False
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if max_data_len is not None and data_len > max_data_len:
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self.to_screen(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
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return False
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data_len_str = format_bytes(data_len)
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byte_counter = 0 + resume_len
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block_size = self.params.get('buffersize', 1024)
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start = time.time()
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while True:
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# Download and write
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before = time.time()
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data_block = data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
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after = time.time()
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if len(data_block) == 0:
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break
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byte_counter += len(data_block)
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# Open file just in time
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if stream is None:
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try:
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(stream, tmpfilename) = sanitize_open(tmpfilename, open_mode)
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assert stream is not None
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filename = self.undo_temp_name(tmpfilename)
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self.report_destination(filename)
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except (OSError, IOError) as err:
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self.report_error(u'unable to open for writing: %s' % str(err))
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return False
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try:
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stream.write(data_block)
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except (IOError, OSError) as err:
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self.to_stderr(u"\n")
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self.report_error(u'unable to write data: %s' % str(err))
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return False
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if not self.params.get('noresizebuffer', False):
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block_size = self.best_block_size(after - before, len(data_block))
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# Progress message
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speed = self.calc_speed(start, time.time(), byte_counter - resume_len)
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if data_len is None:
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eta = percent = None
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else:
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percent = self.calc_percent(byte_counter, data_len)
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eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
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self.report_progress(percent, data_len_str, speed, eta)
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self._hook_progress({
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'downloaded_bytes': byte_counter,
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'total_bytes': data_len,
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'tmpfilename': tmpfilename,
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'filename': filename,
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'status': 'downloading',
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'eta': eta,
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'speed': speed,
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})
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if is_test and byte_counter == data_len:
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break
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# Apply rate limit
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self.slow_down(start, byte_counter - resume_len)
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if stream is None:
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self.to_stderr(u"\n")
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self.report_error(u'Did not get any data blocks')
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return False
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stream.close()
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self.report_finish(data_len_str, (time.time() - start))
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if data_len is not None and byte_counter != data_len:
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raise ContentTooShortError(byte_counter, int(data_len))
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self.try_rename(tmpfilename, filename)
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# Update file modification time
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if self.params.get('updatetime', True):
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info_dict['filetime'] = self.try_utime(filename, data.info().get('last-modified', None))
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self._hook_progress({
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'downloaded_bytes': byte_counter,
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'total_bytes': byte_counter,
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'filename': filename,
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'status': 'finished',
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})
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return True
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