mirror of
https://github.com/yt-dlp/yt-dlp.git
synced 2024-11-09 12:42:28 +01:00
a3c3a1e128
* Simplify code and split into separate routines to facilitate maintaining * Make retry mechanism work on errors during actual download not only during connection establishment phase * Retry on ECONNRESET and ETIMEDOUT during reading data from network * Retry on content too short and various timeout errors * Show error description on retry * Closes #506, closes #809, closes #2849, closes #4240, closes #6023, closes #8625, closes #9483
299 lines
13 KiB
Python
299 lines
13 KiB
Python
from __future__ import unicode_literals
|
|
|
|
import errno
|
|
import os
|
|
import socket
|
|
import time
|
|
import re
|
|
|
|
from .common import FileDownloader
|
|
from ..compat import compat_urllib_error
|
|
from ..utils import (
|
|
ContentTooShortError,
|
|
encodeFilename,
|
|
sanitize_open,
|
|
sanitized_Request,
|
|
write_xattr,
|
|
XAttrMetadataError,
|
|
XAttrUnavailableError,
|
|
)
|
|
|
|
|
|
class HttpFD(FileDownloader):
|
|
def real_download(self, filename, info_dict):
|
|
url = info_dict['url']
|
|
|
|
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)
|
|
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))
|
|
|
|
ctx.open_mode = 'wb'
|
|
ctx.resume_len = 0
|
|
|
|
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))
|
|
|
|
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
|
|
|
|
def establish_connection():
|
|
if ctx.resume_len != 0:
|
|
self.report_resuming_byte(ctx.resume_len)
|
|
request.add_header('Range', 'bytes=%d-' % ctx.resume_len)
|
|
ctx.open_mode = 'ab'
|
|
# 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/rg3/youtube-dl/issues/6057#issuecomment-126129799)
|
|
if ctx.resume_len > 0:
|
|
content_range = ctx.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 ctx.resume_len == int(content_range_m.group(1)):
|
|
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'
|
|
return
|
|
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
|
|
ctx.data = self.ydl.urlopen(basic_request)
|
|
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,
|
|
})
|
|
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
|
|
raise RetryDownload(err)
|
|
except socket.error as err:
|
|
if err.errno != errno.ECONNRESET:
|
|
# Connection reset is no problem, just retry
|
|
raise
|
|
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 = 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
|
|
|
|
def retry(e):
|
|
if ctx.tmpfilename != '-':
|
|
ctx.stream.close()
|
|
ctx.stream = None
|
|
ctx.resume_len = 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))
|
|
# socket.timeout is a subclass of socket.error but may not have
|
|
# errno set
|
|
except socket.timeout as e:
|
|
retry(e)
|
|
except socket.error as e:
|
|
if e.errno not in (errno.ECONNRESET, errno.ETIMEDOUT):
|
|
raise
|
|
retry(e)
|
|
|
|
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 = 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 data_len is None:
|
|
eta = None
|
|
else:
|
|
eta = self.calc_eta(start, time.time(), data_len - ctx.resume_len, byte_counter - ctx.resume_len)
|
|
|
|
self._hook_progress({
|
|
'status': 'downloading',
|
|
'downloaded_bytes': byte_counter,
|
|
'total_bytes': data_len,
|
|
'tmpfilename': ctx.tmpfilename,
|
|
'filename': ctx.filename,
|
|
'eta': eta,
|
|
'speed': speed,
|
|
'elapsed': now - start,
|
|
})
|
|
|
|
if is_test and byte_counter == data_len:
|
|
break
|
|
|
|
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() - start,
|
|
})
|
|
|
|
return True
|
|
|
|
while count <= retries:
|
|
try:
|
|
establish_connection()
|
|
download()
|
|
return True
|
|
except RetryDownload as e:
|
|
count += 1
|
|
if count <= retries:
|
|
self.report_retry(e.source_error, count, retries)
|
|
continue
|
|
except SucceedDownload:
|
|
return True
|
|
|
|
self.report_error('giving up after %s retries' % retries)
|
|
return False
|