|
|
- import os
- import re
- import subprocess
- import sys
- import time
-
- from .common import FileDownloader
- from ..utils import (
- compat_urllib_request,
- compat_urllib_error,
- ContentTooShortError,
-
- encodeFilename,
- sanitize_open,
- format_bytes,
- )
-
-
- 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'}
- if 'user_agent' in info_dict:
- headers['Youtubedl-user-agent'] = info_dict['user_agent']
- basic_request = compat_urllib_request.Request(url, None, headers)
- request = compat_urllib_request.Request(url, None, headers)
-
- if self.params.get('test', False):
- request.add_header('Range','bytes=0-10240')
-
- # 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', False):
- 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:
- if count == 0 and 'urlhandle' in info_dict:
- data = info_dict['urlhandle']
- data = compat_urllib_request.urlopen(request)
- 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 = compat_urllib_request.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',
- })
- return True
- else:
- # The length does not match, we start the download over
- self.report_unable_to_resume()
- open_mode = 'wb'
- break
- # Retry
- count += 1
- if count <= retries:
- self.report_retry(count, retries)
-
- if count > retries:
- self.report_error(u'giving up after %s retries' % retries)
- return False
-
- data_len = data.info().get('Content-length', None)
- if data_len is not None:
- data_len = int(data_len) + resume_len
- min_data_len = self.params.get("min_filesize", None)
- max_data_len = self.params.get("max_filesize", None)
- if min_data_len is not None and data_len < min_data_len:
- self.to_screen(u'\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(u'\r[download] File is larger than max-filesize (%s bytes > %s bytes). Aborting.' % (data_len, max_data_len))
- return False
-
- data_len_str = format_bytes(data_len)
- byte_counter = 0 + resume_len
- block_size = self.params.get('buffersize', 1024)
- start = time.time()
- while True:
- # Download and write
- before = time.time()
- data_block = data.read(block_size)
- after = time.time()
- if len(data_block) == 0:
- break
- byte_counter += len(data_block)
-
- # Open 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(u'unable to open for writing: %s' % str(err))
- return False
- try:
- stream.write(data_block)
- except (IOError, OSError):
- self.to_stderr(u"\n")
- self.report_error(u'unable to write data: %s' % str(err))
- return False
- if not self.params.get('noresizebuffer', False):
- block_size = self.best_block_size(after - before, len(data_block))
-
- # Progress message
- speed = self.calc_speed(start, time.time(), byte_counter - resume_len)
- if data_len is None:
- eta = percent = None
- else:
- percent = self.calc_percent(byte_counter, data_len)
- eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
- self.report_progress(percent, data_len_str, speed, eta)
-
- self._hook_progress({
- 'downloaded_bytes': byte_counter,
- 'total_bytes': data_len,
- 'tmpfilename': tmpfilename,
- 'filename': filename,
- 'status': 'downloading',
- 'eta': eta,
- 'speed': speed,
- })
-
- # Apply rate limit
- self.slow_down(start, byte_counter - resume_len)
-
- if stream is None:
- self.to_stderr(u"\n")
- self.report_error(u'Did not get any data blocks')
- return False
- stream.close()
- self.report_finish(data_len_str, (time.time() - start))
- 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',
- })
-
- return True
|
