[http] Rework HTTP downloader
* 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
This commit is contained in:
Sergey M․
parent
085d9dd9be
commit
a3c3a1e128
@ -304,11 +304,11 @@ class FileDownloader(object):
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"""Report attempt to resume at given byte."""
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self.to_screen('[download] Resuming download at byte %s' % resume_len)
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def report_retry(self, count, retries):
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def report_retry(self, err, count, retries):
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"""Report retry in case of HTTP error 5xx"""
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self.to_screen(
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'[download] Got server HTTP error. Retrying (attempt %d of %s)...'
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% (count, self.format_retries(retries)))
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'[download] Got server HTTP error: %s. Retrying (attempt %d of %s)...'
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% (error_to_compat_str(err), count, self.format_retries(retries)))
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def report_file_already_downloaded(self, file_name):
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"""Report file has already been fully downloaded."""
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@ -22,8 +22,16 @@ from ..utils import (
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class HttpFD(FileDownloader):
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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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class DownloadContext(dict):
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__getattr__ = dict.get
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__setattr__ = dict.__setitem__
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__delattr__ = dict.__delitem__
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ctx = DownloadContext()
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ctx.filename = filename
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ctx.tmpfilename = self.temp_name(filename)
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ctx.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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@ -38,46 +46,51 @@ class HttpFD(FileDownloader):
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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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ctx.open_mode = 'wb'
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ctx.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', True):
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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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if self.params.get('continuedl', True):
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# Establish possible resume length
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if os.path.isfile(encodeFilename(ctx.tmpfilename)):
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ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
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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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class SucceedDownload(Exception):
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pass
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class RetryDownload(Exception):
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def __init__(self, source_error):
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self.source_error = source_error
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def establish_connection():
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if ctx.resume_len != 0:
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self.report_resuming_byte(ctx.resume_len)
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request.add_header('Range', 'bytes=%d-' % ctx.resume_len)
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ctx.open_mode = 'ab'
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# Establish connection
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try:
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data = self.ydl.urlopen(request)
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ctx.data = self.ydl.urlopen(request)
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# When trying to resume, Content-Range HTTP header of response has to be checked
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# to match the value of requested Range HTTP header. This is due to a webservers
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# that don't support resuming and serve a whole file with no Content-Range
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# set in response despite of requested Range (see
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# https://github.com/rg3/youtube-dl/issues/6057#issuecomment-126129799)
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if resume_len > 0:
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content_range = data.headers.get('Content-Range')
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if ctx.resume_len > 0:
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content_range = ctx.data.headers.get('Content-Range')
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if content_range:
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content_range_m = re.search(r'bytes (\d+)-', content_range)
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# Content-Range is present and matches requested Range, resume is possible
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if content_range_m and resume_len == int(content_range_m.group(1)):
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break
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if content_range_m and ctx.resume_len == int(content_range_m.group(1)):
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return
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# Content-Range is either not present or invalid. Assuming remote webserver is
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# trying to send the whole file, resume is not possible, so wiping the local file
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# and performing entire redownload
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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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ctx.resume_len = 0
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ctx.open_mode = 'wb'
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return
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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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@ -86,15 +99,15 @@ class HttpFD(FileDownloader):
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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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ctx.data = self.ydl.urlopen(basic_request)
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content_length = ctx.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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(ctx.resume_len - 100 < int(content_length) < ctx.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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@ -102,152 +115,184 @@ class HttpFD(FileDownloader):
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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.report_file_already_downloaded(ctx.filename)
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self.try_rename(ctx.tmpfilename, ctx.filename)
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self._hook_progress({
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'filename': filename,
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'filename': ctx.filename,
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'status': 'finished',
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'downloaded_bytes': resume_len,
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'total_bytes': resume_len,
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'downloaded_bytes': ctx.resume_len,
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'total_bytes': ctx.resume_len,
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})
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return True
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raise SucceedDownload()
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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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except socket.error as e:
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if e.errno != errno.ECONNRESET:
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ctx.resume_len = 0
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ctx.open_mode = 'wb'
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return
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raise RetryDownload(err)
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except socket.error as err:
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if err.errno != errno.ECONNRESET:
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# Connection reset is no problem, just retry
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raise
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raise RetryDownload(err)
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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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def download():
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data_len = ctx.data.info().get('Content-length', None)
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if count > retries:
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self.report_error('giving up after %s retries' % retries)
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return False
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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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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')
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max_data_len = self.params.get('max_filesize')
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if min_data_len is not None and data_len < min_data_len:
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self.to_screen('\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('\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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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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# measure time over whole while-loop, so slow_down() and best_block_size() work together properly
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now = None # needed for slow_down() in the first loop run
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before = start # start measuring
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while True:
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# Download and write
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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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byte_counter += len(data_block)
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# exit loop when download is finished
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if len(data_block) == 0:
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break
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# Open destination 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('unable to open for writing: %s' % str(err))
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if data_len is not None:
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data_len = int(data_len) + ctx.resume_len
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min_data_len = self.params.get('min_filesize')
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max_data_len = self.params.get('max_filesize')
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if min_data_len is not None and data_len < min_data_len:
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self.to_screen('\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('\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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if self.params.get('xattr_set_filesize', False) and data_len is not None:
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byte_counter = 0 + ctx.resume_len
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block_size = self.params.get('buffersize', 1024)
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start = time.time()
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# measure time over whole while-loop, so slow_down() and best_block_size() work together properly
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now = None # needed for slow_down() in the first loop run
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before = start # start measuring
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def retry(e):
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if ctx.tmpfilename != '-':
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ctx.stream.close()
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ctx.stream = None
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ctx.resume_len = os.path.getsize(encodeFilename(ctx.tmpfilename))
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raise RetryDownload(e)
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while True:
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try:
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# Download and write
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data_block = ctx.data.read(block_size if not is_test else min(block_size, data_len - byte_counter))
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# socket.timeout is a subclass of socket.error but may not have
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# errno set
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except socket.timeout as e:
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retry(e)
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except socket.error as e:
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if e.errno not in (errno.ECONNRESET, errno.ETIMEDOUT):
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raise
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retry(e)
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byte_counter += len(data_block)
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# exit loop when download is finished
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if len(data_block) == 0:
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break
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# Open destination file just in time
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if ctx.stream is None:
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try:
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write_xattr(tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8'))
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except (XAttrUnavailableError, XAttrMetadataError) as err:
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self.report_error('unable to set filesize xattr: %s' % str(err))
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ctx.stream, ctx.tmpfilename = sanitize_open(
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ctx.tmpfilename, ctx.open_mode)
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assert ctx.stream is not None
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ctx.filename = self.undo_temp_name(ctx.tmpfilename)
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self.report_destination(ctx.filename)
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except (OSError, IOError) as err:
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self.report_error('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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if self.params.get('xattr_set_filesize', False) and data_len is not None:
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try:
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write_xattr(ctx.tmpfilename, 'user.ytdl.filesize', str(data_len).encode('utf-8'))
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except (XAttrUnavailableError, XAttrMetadataError) as err:
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self.report_error('unable to set filesize xattr: %s' % str(err))
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try:
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ctx.stream.write(data_block)
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except (IOError, OSError) as err:
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self.to_stderr('\n')
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self.report_error('unable to write data: %s' % str(err))
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return False
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# Apply rate limit
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self.slow_down(start, now, byte_counter - ctx.resume_len)
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# end measuring of one loop run
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now = time.time()
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after = now
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# Adjust block size
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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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before = after
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# Progress message
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speed = self.calc_speed(start, now, byte_counter - ctx.resume_len)
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if data_len is None:
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eta = None
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else:
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eta = self.calc_eta(start, time.time(), data_len - ctx.resume_len, byte_counter - ctx.resume_len)
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self._hook_progress({
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'status': 'downloading',
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'downloaded_bytes': byte_counter,
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'total_bytes': data_len,
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'tmpfilename': ctx.tmpfilename,
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'filename': ctx.filename,
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'eta': eta,
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'speed': speed,
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'elapsed': now - start,
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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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if ctx.stream is None:
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self.to_stderr('\n')
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self.report_error('unable to write data: %s' % str(err))
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self.report_error('Did not get any data blocks')
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return False
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if ctx.tmpfilename != '-':
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ctx.stream.close()
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# Apply rate limit
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self.slow_down(start, now, byte_counter - resume_len)
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if data_len is not None and byte_counter != data_len:
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err = ContentTooShortError(byte_counter, int(data_len))
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if count <= retries:
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retry(err)
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raise err
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# end measuring of one loop run
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now = time.time()
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after = now
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self.try_rename(ctx.tmpfilename, ctx.filename)
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# Adjust block size
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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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before = after
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# Progress message
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speed = self.calc_speed(start, now, byte_counter - resume_len)
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if data_len is None:
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eta = None
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else:
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eta = self.calc_eta(start, time.time(), data_len - resume_len, byte_counter - resume_len)
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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(ctx.filename, ctx.data.info().get('last-modified', None))
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self._hook_progress({
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'status': 'downloading',
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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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'eta': eta,
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'speed': speed,
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'elapsed': now - start,
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'total_bytes': byte_counter,
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'filename': ctx.filename,
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'status': 'finished',
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'elapsed': time.time() - start,
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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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return True
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if stream is None:
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self.to_stderr('\n')
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self.report_error('Did not get any data blocks')
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return False
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if tmpfilename != '-':
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stream.close()
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while count <= retries:
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try:
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establish_connection()
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download()
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return True
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except RetryDownload as e:
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count += 1
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if count <= retries:
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self.report_retry(e.source_error, count, retries)
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continue
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except SucceedDownload:
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return True
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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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'elapsed': time.time() - start,
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})
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return True
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self.report_error('giving up after %s retries' % retries)
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return False
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