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"""Response classes used by urllib.
The base class, addbase, defines a minimal file-like interface,
including read() and readline(). The typical response object is an
addinfourl instance, which defines an info() method that returns
headers and a geturl() method that returns the url.
"""
import tempfile
__all__ = ['addbase', 'addclosehook', 'addinfo', 'addinfourl']
class addbase(tempfile._TemporaryFileWrapper):
"""Base class for addinfo and addclosehook. Is a good idea for garbage collection."""
# XXX Add a method to expose the timeout on the underlying socket?
def __init__(self, fp):
super(addbase, self).__init__(fp, '<urllib response>', delete=False)
# Keep reference around as this was part of the original API.
self.fp = fp
def __repr__(self):
return '<%s at %r whose fp = %r>' % (self.__class__.__name__,
id(self), self.file)
def __enter__(self):
if self.fp.closed:
raise ValueError("I/O operation on closed file")
return self
def __exit__(self, type, value, traceback):
self.close()
class addclosehook(addbase):
"""Class to add a close hook to an open file."""
def __init__(self, fp, closehook, *hookargs):
super(addclosehook, self).__init__(fp)
self.closehook = closehook
self.hookargs = hookargs
def close(self):
try:
closehook = self.closehook
hookargs = self.hookargs
if closehook:
self.closehook = None
self.hookargs = None
closehook(*hookargs)
finally:
super(addclosehook, self).close()
class addinfo(addbase):
"""class to add an info() method to an open file."""
def __init__(self, fp, headers):
super(addinfo, self).__init__(fp)
self.headers = headers
def info(self):
return self.headers
class addinfourl(addinfo):
"""class to add info() and geturl() methods to an open file."""
def __init__(self, fp, headers, url, code=None):
super(addinfourl, self).__init__(fp, headers)
self.url = url
self.code = code
def getcode(self):
return self.code
def geturl(self):
return self.url