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How to use ForwardingFallbackDispatcher method in localstack

Best Python code snippet using localstack_python

moto.py

Source:moto.py

...94    raises a ``NotImplementedError``.95    :param provider: the ASF provider96    :return: a modified DispatchTable97    """98    return ForwardingFallbackDispatcher(provider, proxy_moto)99def dispatch_to_moto(context: RequestContext) -> MotoResponse:100    """101    Internal method to dispatch the request to moto without changing moto's dispatcher output.102    :param context: the request context103    :return: the response from moto104    """105    service = context.service106    request = context.request107    # hack to avoid call to request.form (see moto's BaseResponse.dispatch)108    request.body = request.data109    # this is where we skip the HTTP roundtrip between the moto server and the boto client110    dispatch = get_dispatcher(service.service_name, request.path)111    return dispatch(request, request.url, request.headers)112def get_dispatcher(service: str, path: str) -> MotoDispatcher:...

forwarder.py

Source:forwarder.py

...20from localstack.http import Response21from localstack.http.proxy import forward22from localstack.utils.aws import aws_stack23from localstack.utils.strings import to_str24def ForwardingFallbackDispatcher(25    provider: object, request_forwarder: ServiceRequestHandler26) -> DispatchTable:27    """28    Wraps a provider with a request forwarder. It does by creating a new DispatchTable from the original29    provider, and wrapping each method with a fallthrough method that calls ``request_forwarder`` if the30    original provider raises a ``NotImplementedError``.31    :param provider: the ASF provider32    :param request_forwarder: callable that forwards the request (e.g., to a backend server)33    :return: a modified DispatchTable34    """35    table = create_dispatch_table(provider)36    for op, fn in table.items():37        table[op] = _wrap_with_fallthrough(fn, request_forwarder)38    return table39def _wrap_with_fallthrough(40    handler: ServiceRequestHandler, fallthrough_handler: ServiceRequestHandler41) -> ServiceRequestHandler:42    def _call(context, req) -> ServiceResponse:43        try:44            # handler will typically be an ASF provider method, and in case it hasn't been45            # implemented, we try to fall back to forwarding the request to the backend46            return handler(context, req)47        except NotImplementedError:48            pass49        return fallthrough_handler(context, req)50    return _call51def HttpFallbackDispatcher(provider: object, forward_url_getter: Callable[[], str]):52    return ForwardingFallbackDispatcher(provider, get_request_forwarder_http(forward_url_getter))53def get_request_forwarder_http(forward_url_getter: Callable[[], str]) -> ServiceRequestHandler:54    def _forward_request(context, service_request: ServiceRequest = None) -> ServiceResponse:55        if service_request is not None:56            local_context = create_aws_request_context(57                service_name=context.service.service_name,58                action=context.operation.name,59                parameters=service_request,60                region=context.region,61            )62            local_context.request.headers.update(context.request.headers)63            context = local_context64        return forward_request(context, forward_url_getter)65    return _forward_request66def forward_request(...

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