76 lines
2.7 KiB
Python
76 lines
2.7 KiB
Python
"""Exception classes raised by urllib.
|
|
|
|
The base exception class is URLError, which inherits from IOError. It
|
|
doesn't define any behavior of its own, but is the base class for all
|
|
exceptions defined in this package.
|
|
|
|
HTTPError is an exception class that is also a valid HTTP response
|
|
instance. It behaves this way because HTTP protocol errors are valid
|
|
responses, with a status code, headers, and a body. In some contexts,
|
|
an application may want to handle an exception like a regular
|
|
response.
|
|
"""
|
|
from __future__ import absolute_import, division, unicode_literals
|
|
from future import standard_library
|
|
|
|
from future.backports.urllib import response as urllib_response
|
|
|
|
|
|
__all__ = ['URLError', 'HTTPError', 'ContentTooShortError']
|
|
|
|
|
|
# do these error classes make sense?
|
|
# make sure all of the IOError stuff is overridden. we just want to be
|
|
# subtypes.
|
|
|
|
class URLError(IOError):
|
|
# URLError is a sub-type of IOError, but it doesn't share any of
|
|
# the implementation. need to override __init__ and __str__.
|
|
# It sets self.args for compatibility with other EnvironmentError
|
|
# subclasses, but args doesn't have the typical format with errno in
|
|
# slot 0 and strerror in slot 1. This may be better than nothing.
|
|
def __init__(self, reason, filename=None):
|
|
self.args = reason,
|
|
self.reason = reason
|
|
if filename is not None:
|
|
self.filename = filename
|
|
|
|
def __str__(self):
|
|
return '<urlopen error %s>' % self.reason
|
|
|
|
class HTTPError(URLError, urllib_response.addinfourl):
|
|
"""Raised when HTTP error occurs, but also acts like non-error return"""
|
|
__super_init = urllib_response.addinfourl.__init__
|
|
|
|
def __init__(self, url, code, msg, hdrs, fp):
|
|
self.code = code
|
|
self.msg = msg
|
|
self.hdrs = hdrs
|
|
self.fp = fp
|
|
self.filename = url
|
|
# The addinfourl classes depend on fp being a valid file
|
|
# object. In some cases, the HTTPError may not have a valid
|
|
# file object. If this happens, the simplest workaround is to
|
|
# not initialize the base classes.
|
|
if fp is not None:
|
|
self.__super_init(fp, hdrs, url, code)
|
|
|
|
def __str__(self):
|
|
return 'HTTP Error %s: %s' % (self.code, self.msg)
|
|
|
|
# since URLError specifies a .reason attribute, HTTPError should also
|
|
# provide this attribute. See issue13211 for discussion.
|
|
@property
|
|
def reason(self):
|
|
return self.msg
|
|
|
|
def info(self):
|
|
return self.hdrs
|
|
|
|
|
|
# exception raised when downloaded size does not match content-length
|
|
class ContentTooShortError(URLError):
|
|
def __init__(self, message, content):
|
|
URLError.__init__(self, message)
|
|
self.content = content
|