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96 lines
2.9 KiB
Python
96 lines
2.9 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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class addbase(object):
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"""Base class for addinfo and addclosehook."""
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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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# TODO(jhylton): Is there a better way to delegate using io?
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self.fp = fp
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self.read = self.fp.read
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self.readline = self.fp.readline
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# TODO(jhylton): Make sure an object with readlines() is also iterable
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if hasattr(self.fp, "readlines"):
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self.readlines = self.fp.readlines
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if hasattr(self.fp, "fileno"):
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self.fileno = self.fp.fileno
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else:
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self.fileno = lambda: None
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def __iter__(self):
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# Assigning `__iter__` to the instance doesn't work as intended
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# because the iter builtin does something like `cls.__iter__(obj)`
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# and thus fails to find the _bound_ method `obj.__iter__`.
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# Returning just `self.fp` works for built-in file objects but
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# might not work for general file-like objects.
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return iter(self.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.fp)
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def close(self):
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self.read = None
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self.readline = None
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self.readlines = None
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self.fileno = None
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if self.fp: self.fp.close()
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self.fp = None
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def __enter__(self):
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if self.fp is None:
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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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addbase.__init__(self, 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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addbase.close(self)
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if self.closehook:
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self.closehook(*self.hookargs)
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self.closehook = None
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self.hookargs = None
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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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addbase.__init__(self, 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(addbase):
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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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addbase.__init__(self, fp)
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self.headers = headers
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self.url = url
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self.code = code
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def info(self):
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return self.headers
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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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