bbf6d9b026
Bugfix for feeds
- removed categories related and up
- load new books now working
- category random now working
login page is free of non accessible elements
boolean custom column is vivible in UI
books with only with certain languages can be shown
book shelfs can be deleted from UI
Anonymous user view is more resticted
Added browse of series in sidebar
Dependencys in vendor folder are updated to newer versions (licencs files are now present)
Bugfix editing Authors names
Made upload on windows working
300 lines
10 KiB
Python
300 lines
10 KiB
Python
from __future__ import absolute_import
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import time
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import logging
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from ..exceptions import (
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ConnectTimeoutError,
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MaxRetryError,
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ProtocolError,
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ReadTimeoutError,
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ResponseError,
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)
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from ..packages import six
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log = logging.getLogger(__name__)
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class Retry(object):
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""" Retry configuration.
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Each retry attempt will create a new Retry object with updated values, so
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they can be safely reused.
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Retries can be defined as a default for a pool::
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retries = Retry(connect=5, read=2, redirect=5)
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http = PoolManager(retries=retries)
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response = http.request('GET', 'http://example.com/')
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Or per-request (which overrides the default for the pool)::
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response = http.request('GET', 'http://example.com/', retries=Retry(10))
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Retries can be disabled by passing ``False``::
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response = http.request('GET', 'http://example.com/', retries=False)
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Errors will be wrapped in :class:`~urllib3.exceptions.MaxRetryError` unless
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retries are disabled, in which case the causing exception will be raised.
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:param int total:
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Total number of retries to allow. Takes precedence over other counts.
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Set to ``None`` to remove this constraint and fall back on other
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counts. It's a good idea to set this to some sensibly-high value to
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account for unexpected edge cases and avoid infinite retry loops.
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Set to ``0`` to fail on the first retry.
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Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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:param int connect:
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How many connection-related errors to retry on.
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These are errors raised before the request is sent to the remote server,
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which we assume has not triggered the server to process the request.
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Set to ``0`` to fail on the first retry of this type.
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:param int read:
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How many times to retry on read errors.
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These errors are raised after the request was sent to the server, so the
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request may have side-effects.
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Set to ``0`` to fail on the first retry of this type.
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:param int redirect:
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How many redirects to perform. Limit this to avoid infinite redirect
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loops.
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A redirect is a HTTP response with a status code 301, 302, 303, 307 or
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308.
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Set to ``0`` to fail on the first retry of this type.
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Set to ``False`` to disable and imply ``raise_on_redirect=False``.
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:param iterable method_whitelist:
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Set of uppercased HTTP method verbs that we should retry on.
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By default, we only retry on methods which are considered to be
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idempotent (multiple requests with the same parameters end with the
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same state). See :attr:`Retry.DEFAULT_METHOD_WHITELIST`.
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Set to a ``False`` value to retry on any verb.
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:param iterable status_forcelist:
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A set of integer HTTP status codes that we should force a retry on.
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A retry is initiated if the request method is in ``method_whitelist``
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and the response status code is in ``status_forcelist``.
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By default, this is disabled with ``None``.
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:param float backoff_factor:
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A backoff factor to apply between attempts after the second try
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(most errors are resolved immediately by a second try without a
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delay). urllib3 will sleep for::
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{backoff factor} * (2 ^ ({number of total retries} - 1))
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seconds. If the backoff_factor is 0.1, then :func:`.sleep` will sleep
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for [0.0s, 0.2s, 0.4s, ...] between retries. It will never be longer
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than :attr:`Retry.BACKOFF_MAX`.
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By default, backoff is disabled (set to 0).
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:param bool raise_on_redirect: Whether, if the number of redirects is
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exhausted, to raise a MaxRetryError, or to return a response with a
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response code in the 3xx range.
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:param bool raise_on_status: Similar meaning to ``raise_on_redirect``:
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whether we should raise an exception, or return a response,
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if status falls in ``status_forcelist`` range and retries have
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been exhausted.
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"""
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DEFAULT_METHOD_WHITELIST = frozenset([
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'HEAD', 'GET', 'PUT', 'DELETE', 'OPTIONS', 'TRACE'])
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#: Maximum backoff time.
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BACKOFF_MAX = 120
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def __init__(self, total=10, connect=None, read=None, redirect=None,
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method_whitelist=DEFAULT_METHOD_WHITELIST, status_forcelist=None,
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backoff_factor=0, raise_on_redirect=True, raise_on_status=True,
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_observed_errors=0):
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self.total = total
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self.connect = connect
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self.read = read
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if redirect is False or total is False:
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redirect = 0
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raise_on_redirect = False
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self.redirect = redirect
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self.status_forcelist = status_forcelist or set()
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self.method_whitelist = method_whitelist
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self.backoff_factor = backoff_factor
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self.raise_on_redirect = raise_on_redirect
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self.raise_on_status = raise_on_status
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self._observed_errors = _observed_errors # TODO: use .history instead?
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def new(self, **kw):
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params = dict(
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total=self.total,
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connect=self.connect, read=self.read, redirect=self.redirect,
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method_whitelist=self.method_whitelist,
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status_forcelist=self.status_forcelist,
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backoff_factor=self.backoff_factor,
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raise_on_redirect=self.raise_on_redirect,
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raise_on_status=self.raise_on_status,
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_observed_errors=self._observed_errors,
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)
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params.update(kw)
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return type(self)(**params)
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@classmethod
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def from_int(cls, retries, redirect=True, default=None):
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""" Backwards-compatibility for the old retries format."""
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if retries is None:
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retries = default if default is not None else cls.DEFAULT
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if isinstance(retries, Retry):
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return retries
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redirect = bool(redirect) and None
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new_retries = cls(retries, redirect=redirect)
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log.debug("Converted retries value: %r -> %r", retries, new_retries)
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return new_retries
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def get_backoff_time(self):
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""" Formula for computing the current backoff
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:rtype: float
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"""
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if self._observed_errors <= 1:
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return 0
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backoff_value = self.backoff_factor * (2 ** (self._observed_errors - 1))
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return min(self.BACKOFF_MAX, backoff_value)
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def sleep(self):
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""" Sleep between retry attempts using an exponential backoff.
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By default, the backoff factor is 0 and this method will return
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immediately.
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"""
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backoff = self.get_backoff_time()
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if backoff <= 0:
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return
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time.sleep(backoff)
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def _is_connection_error(self, err):
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""" Errors when we're fairly sure that the server did not receive the
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request, so it should be safe to retry.
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"""
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return isinstance(err, ConnectTimeoutError)
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def _is_read_error(self, err):
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""" Errors that occur after the request has been started, so we should
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assume that the server began processing it.
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"""
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return isinstance(err, (ReadTimeoutError, ProtocolError))
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def is_forced_retry(self, method, status_code):
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""" Is this method/status code retryable? (Based on method/codes whitelists)
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"""
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if self.method_whitelist and method.upper() not in self.method_whitelist:
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return False
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return self.status_forcelist and status_code in self.status_forcelist
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def is_exhausted(self):
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""" Are we out of retries? """
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retry_counts = (self.total, self.connect, self.read, self.redirect)
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retry_counts = list(filter(None, retry_counts))
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if not retry_counts:
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return False
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return min(retry_counts) < 0
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def increment(self, method=None, url=None, response=None, error=None,
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_pool=None, _stacktrace=None):
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""" Return a new Retry object with incremented retry counters.
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:param response: A response object, or None, if the server did not
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return a response.
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:type response: :class:`~urllib3.response.HTTPResponse`
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:param Exception error: An error encountered during the request, or
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None if the response was received successfully.
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:return: A new ``Retry`` object.
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"""
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if self.total is False and error:
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# Disabled, indicate to re-raise the error.
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raise six.reraise(type(error), error, _stacktrace)
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total = self.total
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if total is not None:
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total -= 1
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_observed_errors = self._observed_errors
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connect = self.connect
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read = self.read
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redirect = self.redirect
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cause = 'unknown'
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if error and self._is_connection_error(error):
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# Connect retry?
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if connect is False:
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raise six.reraise(type(error), error, _stacktrace)
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elif connect is not None:
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connect -= 1
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_observed_errors += 1
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elif error and self._is_read_error(error):
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# Read retry?
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if read is False:
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raise six.reraise(type(error), error, _stacktrace)
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elif read is not None:
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read -= 1
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_observed_errors += 1
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elif response and response.get_redirect_location():
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# Redirect retry?
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if redirect is not None:
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redirect -= 1
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cause = 'too many redirects'
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else:
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# Incrementing because of a server error like a 500 in
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# status_forcelist and a the given method is in the whitelist
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_observed_errors += 1
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cause = ResponseError.GENERIC_ERROR
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if response and response.status:
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cause = ResponseError.SPECIFIC_ERROR.format(
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status_code=response.status)
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new_retry = self.new(
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total=total,
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connect=connect, read=read, redirect=redirect,
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_observed_errors=_observed_errors)
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if new_retry.is_exhausted():
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raise MaxRetryError(_pool, url, error or ResponseError(cause))
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log.debug("Incremented Retry for (url='%s'): %r", url, new_retry)
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return new_retry
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def __repr__(self):
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return ('{cls.__name__}(total={self.total}, connect={self.connect}, '
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'read={self.read}, redirect={self.redirect})').format(
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cls=type(self), self=self)
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# For backwards compatibility (equivalent to pre-v1.9):
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Retry.DEFAULT = Retry(3)
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