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How to use create_dispatch_table method in localstack

Best Python code snippet using localstack_python

skeleton.py

Source:skeleton.py

...18DispatchTable = Dict[str, ServiceRequestHandler]19def create_skeleton(service: Union[str, ServiceModel], delegate: Any):20    if isinstance(service, str):21        service = load_service(service)22    return Skeleton(service, create_dispatch_table(delegate))23class HandlerAttributes(NamedTuple):24    """25    Holder object of the attributes added to a function by the @handler decorator.26    """27    function_name: str28    operation: str29    pass_context: bool30    expand_parameters: bool31def create_dispatch_table(delegate: object) -> DispatchTable:32    """33    Creates a dispatch table for a given object. First, the entire class tree of the object is scanned to find any34    functions that are decorated with @handler. It then resolve those functions on the delegate.35    """36    # scan class tree for @handler wrapped functions (reverse class tree so that inherited functions overwrite parent37    # functions)38    cls_tree = inspect.getmro(delegate.__class__)39    handlers: Dict[str, HandlerAttributes] = dict()40    cls_tree = reversed(list(cls_tree))41    for cls in cls_tree:42        if cls == object:43            continue44        for name, fn in inspect.getmembers(cls, inspect.isfunction):45            try:46                # attributes come from operation_marker in @handler wrapper47                handlers[fn.operation] = HandlerAttributes(48                    fn.__name__, fn.operation, fn.pass_context, fn.expand_parameters49                )50            except AttributeError:51                pass52    # create dispatch table from operation handlers by resolving bound functions on the delegate53    dispatch_table: DispatchTable = dict()54    for handler in handlers.values():55        # resolve the bound function of the delegate56        bound_function = getattr(delegate, handler.function_name)57        # create a dispatcher58        dispatch_table[handler.operation] = ServiceRequestDispatcher(59            bound_function,60            operation=handler.operation,61            pass_context=handler.pass_context,62            expand_parameters=handler.expand_parameters,63        )64    return dispatch_table65class ServiceRequestDispatcher:66    fn: Callable67    operation: str68    expand_parameters: bool = True69    pass_context: bool = True70    def __init__(71        self,72        fn: Callable,73        operation: str,74        pass_context: bool = True,75        expand_parameters: bool = True,76    ):77        self.fn = fn78        self.operation = operation79        self.pass_context = pass_context80        self.expand_parameters = expand_parameters81    def __call__(82        self, context: RequestContext, request: ServiceRequest83    ) -> Optional[ServiceResponse]:84        args = []85        kwargs = {}86        if not self.expand_parameters:87            if self.pass_context:88                args.append(context)89            args.append(request)90        else:91            if request is None:92                kwargs = {}93            else:94                kwargs = {xform_name(k): v for k, v in request.items()}95            kwargs["context"] = context96        return self.fn(*args, **kwargs)97class Skeleton:98    service: ServiceModel99    dispatch_table: DispatchTable100    def __init__(self, service: ServiceModel, implementation: Union[Any, DispatchTable]):101        self.service = service102        self.parser = create_parser(service)103        self.serializer = create_serializer(service)104        if isinstance(implementation, dict):105            self.dispatch_table = implementation106        else:107            self.dispatch_table = create_dispatch_table(implementation)108    def invoke(self, context: RequestContext) -> HttpResponse:109        if context.operation and context.service_request:110            # if the parsed request is already set in the context, re-use them111            operation, instance = context.operation, context.service_request112        else:113            # otherwise parse the incoming HTTPRequest114            operation, instance = self.parser.parse(context.request)115            context.operation = operation116        serializer = self.serializer117        try:118            # Find the operation's handler in the dispatch table119            if operation.name not in self.dispatch_table:120                LOG.warning(121                    "missing entry in dispatch table for %s.%s",...

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