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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. """ from __future__ import absolute_import, division, unicode_literals from future.builtins import object class addbase(object): """Base class for addinfo and addclosehook.""" # XXX Add a method to expose the timeout on the underlying socket? def __init__(self, fp): # TODO(jhylton): Is there a better way to delegate using io? self.fp = fp self.read = self.fp.read self.readline = self.fp.readline # TODO(jhylton): Make sure an object with readlines() is also iterable if hasattr(self.fp, "readlines"): self.readlines = self.fp.readlines if hasattr(self.fp, "fileno"): self.fileno = self.fp.fileno else: self.fileno = lambda: None def __iter__(self): # Assigning `__iter__` to the instance doesn't work as intended # because the iter builtin does something like `cls.__iter__(obj)` # and thus fails to find the _bound_ method `obj.__iter__`. # Returning just `self.fp` works for built-in file objects but # might not work for general file-like objects. return iter(self.fp) def __repr__(self): return '<%s at %r whose fp = %r>' % (self.__class__.__name__, id(self), self.fp) def close(self): if self.fp: self.fp.close() self.fp = None self.read = None self.readline = None self.readlines = None self.fileno = None self.__iter__ = None self.__next__ = None def __enter__(self): if self.fp is None: 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): addbase.__init__(self, fp) self.closehook = closehook self.hookargs = hookargs def close(self): if self.closehook: self.closehook(*self.hookargs) self.closehook = None self.hookargs = None addbase.close(self) class addinfo(addbase): """class to add an info() method to an open file.""" def __init__(self, fp, headers): addbase.__init__(self, fp) self.headers = headers def info(self): return self.headers class addinfourl(addbase): """class to add info() and geturl() methods to an open file.""" def __init__(self, fp, headers, url, code=None): addbase.__init__(self, fp) self.headers = headers self.url = url self.code = code def info(self): return self.headers def getcode(self): return self.code def geturl(self): return self.url del absolute_import, division, unicode_literals, object