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7e7a3dba5f
robust at shutdown. If needs to release multiple resources, they are released even if errors are occured.
80 lines
2.2 KiB
Python
80 lines
2.2 KiB
Python
"""Response classes used by urllib.
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The base class, addbase, defines a minimal file-like interface,
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including read() and readline(). The typical response object is an
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addinfourl instance, which defines an info() method that returns
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headers and a geturl() method that returns the url.
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"""
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import tempfile
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__all__ = ['addbase', 'addclosehook', 'addinfo', 'addinfourl']
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class addbase(tempfile._TemporaryFileWrapper):
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"""Base class for addinfo and addclosehook. Is a good idea for garbage collection."""
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# XXX Add a method to expose the timeout on the underlying socket?
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def __init__(self, fp):
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super(addbase, self).__init__(fp, '<urllib response>', delete=False)
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# Keep reference around as this was part of the original API.
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self.fp = fp
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def __repr__(self):
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return '<%s at %r whose fp = %r>' % (self.__class__.__name__,
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id(self), self.file)
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def __enter__(self):
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if self.fp.closed:
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raise ValueError("I/O operation on closed file")
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return self
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def __exit__(self, type, value, traceback):
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self.close()
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class addclosehook(addbase):
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"""Class to add a close hook to an open file."""
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def __init__(self, fp, closehook, *hookargs):
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super(addclosehook, self).__init__(fp)
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self.closehook = closehook
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self.hookargs = hookargs
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def close(self):
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try:
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closehook = self.closehook
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hookargs = self.hookargs
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if closehook:
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self.closehook = None
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self.hookargs = None
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closehook(*hookargs)
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finally:
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super(addclosehook, self).close()
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class addinfo(addbase):
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"""class to add an info() method to an open file."""
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def __init__(self, fp, headers):
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super(addinfo, self).__init__(fp)
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self.headers = headers
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def info(self):
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return self.headers
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class addinfourl(addinfo):
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"""class to add info() and geturl() methods to an open file."""
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def __init__(self, fp, headers, url, code=None):
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super(addinfourl, self).__init__(fp, headers)
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self.url = url
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self.code = code
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def getcode(self):
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return self.code
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def geturl(self):
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return self.url
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