How to use fully_qualified_class_name method in localstack

Best Python code snippet using localstack_python

util.py

Source:util.py

1import cPickle2import random3import string4# TODO: This needs to be enhanced into a name service that guarantees a5# TODO: unique name across multiple processes.6def generate_random_name(prefix, length):7    nonce_len = length - len(prefix)8    if nonce_len <= 0:9        raise Exception("Invalid name length ({})".format(length))10    return prefix + "".join([random.choice(string.hexdigits) for i in xrange(nonce_len)])11def create_class_instance(fully_qualified_class_name, *args, **kwargs):12    """13    Instantiates an object of type given by fully_qualified_class_name, and14    passes the supplied args and kwargs to the class's init method.15    :param fully_qualified_class_name: the fully qualified name of the class to instantiate16    :param args: positional arguments to pass to the class's init method17    :param kwargs: keyword arguments to pass to the class's init method18    :return:19    """20    try:21        tokens = fully_qualified_class_name.split('.')22        module_name = '.'.join(tokens[:-1])23        class_name = tokens[-1]24        module = __import__(module_name)25        for token in module_name.split('.')[1:]:26            module = getattr(module, token)27        callable = getattr(module, class_name)28        instance = callable(*args, **kwargs)29    except Exception as e:30        raise Exception("Failed to construct instance of class {}".format(fully_qualified_class_name))31    return instance32class Singleton(type):33    # A dictionary that serves as a registry of singletons34    _registry = {}35    def __call__(cls, *args, **kwargs):36        # If class previously instantiated and added to the registry then37        # return that same object; otherwise, create a new instance and38        # add it to the registry39        if cls not in cls._registry:40            cls._registry[cls] = super(Singleton, cls).__call__(*args, **kwargs)41        return cls._registry[cls]42    @classmethod43    def _remove(cls, target_cls):44        if cls._registry.has_key(target_cls):45            cls._registry.pop(target_cls)46    @classmethod47    def _clear(cls):48        cls._registry.clear()49class MsgUtils(object):50    @staticmethod51    def serialize(obj):52        return cPickle.dumps(obj)53    @staticmethod54    def deserialize(serialized_obj):55        return cPickle.loads(serialized_obj) if serialized_obj else None56class RosMsgUtils(object):57    @staticmethod58    def wrap(obj, cls, prop):59        wrapper_cls = cls()60        setattr(wrapper_cls, prop, obj)61        return wrapper_cls62    @staticmethod63    def unwrap(obj, prop):64        if obj is not None and hasattr(obj, prop):65            return getattr(obj, prop)66        else:...

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