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'''addrxlat.exceptions
'''
from .constants import *
from .utils import to_unicode
from _addrxlat import ffi, lib as C
def strerror(status):
'''strerror(status) -> error message
Return the string describing a given error status.'''
return to_unicode(ffi.string(C.addrxlat_strerror(status)))
class AddrxlatError(Exception):
'''Common base for all addrxlat exceptions.
AddrxlatError(status[, message])
If message is not specified, use addrxlat_strerror(status).
Attributes:
status addrxlat status code, see ERR_xxx
message verbose error message'''
def __init__(self, status, message=None):
if message is None:
message = strerror(status)
super(AddrxlatError, self).__init__(message)
self.status = status
self.message = message
def _def_exception(name, status, addbases=()):
'''Create an addrxlat exception for a given status code.
The new exception is derived from AddrxlatError, but you may specify
additional base classes with addbases.
'''
def __init__(self, *args, **kwargs):
super(cls, self).__init__(status, *args, **kwargs)
def __repr__(self):
"x.__repr__() <==> repr(x)"
return "%s%r" % (self.__class__.__name__, self.args[1:])
di = {
'__doc__' : name + '([message])' + '''
If message is not specified, use the default error message.
''',
'status' : status,
'__init__' : __init__,
'__repr__' : __repr__,
}
cls = type(name, (AddrxlatError,) + addbases, di)
return cls
_exceptions = {
('NotImplementedError', ERR_NOTIMPL, (NotImplementedError,)),
('NotPresentError', ERR_NOTPRESENT),
('InvalidError', ERR_INVALID),
('MemoryError', ERR_NOMEM, (MemoryError,)),
('NoDataError', ERR_NODATA),
('NoMethodError', ERR_NOMETH),
}
_exc_map = {}
for _exc in _exceptions:
_cls = _def_exception(*_exc)
globals()[_cls.__name__] = _cls
_exc_map[_cls.status] = _cls
# Free up init-time variables
del _exc, _cls, _exceptions, _def_exception
def get_exception(status, *args, **kwargs):
'''get_exception(status[, message])
Get an appropriate exception for the given status. If there is no
specific exception, make an instance of AddrxlatError.
'''
exc = _exc_map.get(status)
if exc is not None:
return exc(*args, **kwargs)
return AddrxlatError(status, *args, **kwargs)
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