author | Nishanth Amuluru <nishanth@fossee.in> |
Sat, 08 Jan 2011 11:20:57 +0530 | |
changeset 69 | c6bca38c1cbf |
permissions | -rw-r--r-- |
69
c6bca38c1cbf
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""" |
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create errno-specific classes for IO or os calls. |
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|
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""" |
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import sys, os, errno |
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|
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class Error(EnvironmentError): |
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def __repr__(self): |
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return "%s.%s %r: %s " %(self.__class__.__module__, |
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self.__class__.__name__, |
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self.__class__.__doc__, |
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" ".join(map(str, self.args)), |
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#repr(self.args) |
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) |
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|
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def __str__(self): |
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s = "[%s]: %s" %(self.__class__.__doc__, |
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" ".join(map(str, self.args)), |
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) |
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return s |
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_winerrnomap = { |
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2: errno.ENOENT, |
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3: errno.ENOENT, |
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17: errno.EEXIST, |
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22: errno.ENOTDIR, |
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267: errno.ENOTDIR, |
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5: errno.EACCES, # anything better? |
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} |
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|
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class ErrorMaker(object): |
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""" lazily provides Exception classes for each possible POSIX errno |
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(as defined per the 'errno' module). All such instances |
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subclass EnvironmentError. |
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""" |
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Error = Error |
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_errno2class = {} |
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def __getattr__(self, name): |
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eno = getattr(errno, name) |
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cls = self._geterrnoclass(eno) |
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setattr(self, name, cls) |
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return cls |
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|
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def _geterrnoclass(self, eno): |
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try: |
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return self._errno2class[eno] |
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except KeyError: |
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clsname = errno.errorcode.get(eno, "UnknownErrno%d" %(eno,)) |
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errorcls = type(Error)(clsname, (Error,), |
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{'__module__':'py.error', |
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'__doc__': os.strerror(eno)}) |
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self._errno2class[eno] = errorcls |
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return errorcls |
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|
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def checked_call(self, func, *args, **kwargs): |
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""" call a function and raise an errno-exception if applicable. """ |
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__tracebackhide__ = True |
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try: |
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return func(*args, **kwargs) |
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except self.Error: |
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raise |
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except EnvironmentError: |
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cls, value, tb = sys.exc_info() |
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if not hasattr(value, 'errno'): |
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raise |
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__tracebackhide__ = False |
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errno = value.errno |
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try: |
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if not isinstance(value, WindowsError): |
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raise NameError |
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except NameError: |
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# we are not on Windows, or we got a proper OSError |
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cls = self._geterrnoclass(errno) |
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else: |
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try: |
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cls = self._geterrnoclass(_winerrnomap[errno]) |
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except KeyError: |
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raise value |
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raise cls("%s%r" % (func.__name__, args)) |
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__tracebackhide__ = True |
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|
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error = ErrorMaker() |