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yt-dlp/yt_dlp/downloader/http.py

384 lines
16 KiB
Python

import os
import random
import time
from .common import FileDownloader
from ..networking import Request
from ..networking.exceptions import (
CertificateVerifyError,
HTTPError,
TransportError,
)
from ..utils import (
ContentTooShortError,
RetryManager,
ThrottledDownload,
XAttrMetadataError,
XAttrUnavailableError,
encodeFilename,
int_or_none,
parse_http_range,
try_call,
write_xattr,
)
from ..utils.networking import HTTPHeaderDict
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
# Disable compression
headers = HTTPHeaderDict({'Accept-Encoding': 'identity'}, info_dict.get('http_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
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 = Request(url, request_data, headers)
has_range = range_start is not None
if has_range:
request.headers['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)
# Content-Range is present and matches requested Range, resume is possible
if range_start == content_range_start and (
# 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):
ctx.content_len = content_len
if content_len or req_end:
ctx.data_len = min(content_len or req_end, 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
elif range_start > 0:
self.report_unable_to_resume()
ctx.resume_len = 0
ctx.open_mode = 'wb'
ctx.data_len = ctx.content_len = int_or_none(ctx.data.headers.get('Content-length', None))
except HTTPError as err:
if err.status == 416:
# Unable to resume (requested range not satisfiable)
try:
# Open the connection again without the range header
ctx.data = self.ydl.urlopen(
Request(url, request_data, headers))
content_length = ctx.data.headers['Content-Length']
except HTTPError as err:
if err.status < 500 or err.status >= 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.status < 500 or err.status >= 600:
# Unexpected HTTP error
raise
raise RetryDownload(err)
except CertificateVerifyError:
raise
except TransportError as err:
raise RetryDownload(err)
def close_stream():
if ctx.stream is not None:
if not ctx.tmpfilename == '-':
ctx.stream.close()
ctx.stream = None
def download():
data_len = ctx.data.headers.get('Content-length')
if ctx.data.headers.get('Content-encoding'):
# Content-encoding is present, Content-length is not reliable anymore as we are
# doing auto decompression. (See: https://github.com/yt-dlp/yt-dlp/pull/6176)
data_len = 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(
f'\r[download] File is smaller than min-filesize ({data_len} bytes < {min_data_len} bytes). Aborting.')
return False
if max_data_len is not None and data_len > max_data_len:
self.to_screen(
f'\r[download] File is larger than max-filesize ({data_len} bytes > {max_data_len} bytes). Aborting.')
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):
close_stream()
if ctx.tmpfilename == '-':
ctx.resume_len = byte_counter
else:
try:
ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
except FileNotFoundError:
ctx.resume_len = 0
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 TransportError 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 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())
except (XAttrUnavailableError, XAttrMetadataError) as err:
self.report_error('unable to set filesize xattr: %s' % str(err))
try:
ctx.stream.write(data_block)
except 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 ctx.stream is None:
self.to_stderr('\n')
self.report_error('Did not get any data blocks')
return False
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
raise NextFragment()
if ctx.tmpfilename != '-':
ctx.stream.close()
if data_len is not None and byte_counter != data_len:
err = ContentTooShortError(byte_counter, int(data_len))
retry(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.headers.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
for retry in RetryManager(self.params.get('retries'), self.report_retry):
try:
establish_connection()
return download()
except RetryDownload as err:
retry.error = err.source_error
continue
except NextFragment:
retry.error = None
retry.attempt -= 1
continue
except SucceedDownload:
return True
except: # noqa: E722
close_stream()
raise
return False