def _get_impl(): """Delay import of rpc_backend until configuration is loaded.""" global _RPCIMPL if _RPCIMPL is None: try: _RPCIMPL = importutils.import_module(CONF.rpc_backend) except ImportError: # For backwards compatibility with older nova config. impl = CONF.rpc_backend.replace('nova.rpc', 'nova.openstack.common.rpc') _RPCIMPL = importutils.import_module(impl) return _RPCIMPL
def _import_module(mod_str): try: if mod_str.startswith("bin."): imp.load_source(mod_str[4:], os.path.join("bin", mod_str[4:])) return sys.modules[mod_str[4:]] else: return importutils.import_module(mod_str) except ImportError as ie: sys.stderr.write("%s\n" % str(ie)) return None except Exception: return None
def _get_drivers(): """Instantiate, cache, and return drivers based on the CONF.""" global _drivers if _drivers is None: _drivers = {} for notification_driver in CONF.notification_driver: try: driver = importutils.import_module(notification_driver) _drivers[notification_driver] = driver except ImportError: LOG.exception(_("Failed to load notifier %s. " "These notifications will not be sent.") % notification_driver) return _drivers.values()
def deserialize_remote_exception(conf, data): failure = jsonutils.loads(str(data)) trace = failure.get('tb', []) message = failure.get('message', "") + "\n" + "\n".join(trace) name = failure.get('class') module = failure.get('module') # NOTE(ameade): We DO NOT want to allow just any module to be imported, in # order to prevent arbitrary code execution. if module not in conf.allowed_rpc_exception_modules: return RemoteError(name, failure.get('message'), trace) try: mod = importutils.import_module(module) klass = getattr(mod, name) if not issubclass(klass, Exception): raise TypeError("Can only deserialize Exceptions") failure = klass(*failure.get('args', []), **failure.get('kwargs', {})) except (AttributeError, TypeError, ImportError): return RemoteError(name, failure.get('message'), trace) ex_type = type(failure) str_override = lambda self: message new_ex_type = type(ex_type.__name__ + _REMOTE_POSTFIX, (ex_type,), {'__str__': str_override, '__unicode__': str_override}) new_ex_type.__module__ = '%s%s' % (module, _REMOTE_POSTFIX) try: # NOTE(ameade): Dynamically create a new exception type and swap it in # as the new type for the exception. This only works on user defined # Exceptions and not core python exceptions. This is important because # we cannot necessarily change an exception message so we must override # the __str__ method. failure.__class__ = new_ex_type except TypeError: # NOTE(ameade): If a core exception then just add the traceback to the # first exception argument. failure.args = (message,) + failure.args[1:] return failure
def __get_backend(self): """Get the actual backend. May be a module or an instance of a class. Doesn't matter to us. We do this synchronized as it's possible multiple greenthreads started very quickly trying to do DB calls and eventlet can switch threads before self.__backend gets assigned. """ if self.__backend: # Another thread assigned it return self.__backend backend_name = CONF.database.backend self.__use_tpool = CONF.database.use_tpool if self.__use_tpool: from eventlet import tpool self.__tpool = tpool # Import the untranslated name if we don't have a # mapping. backend_path = self.__backend_mapping.get(backend_name, backend_name) backend_mod = importutils.import_module(backend_path) self.__backend = backend_mod.get_backend() return self.__backend
def __init__(self, hashtype='SHA256'): self.hashfn = importutils.import_module('Crypto.Hash.' + hashtype) self.max_okm_length = 255 * self.hashfn.digest_size
def __init__(self, enctype='AES', hashtype='SHA256'): self.cipher = importutils.import_module('Crypto.Cipher.' + enctype) self.hashfn = importutils.import_module('Crypto.Hash.' + hashtype)