How to get map with C++ API

[atimin]

Hey again, I'm going deeper with WAMP and faced another problem.

I have a callee in python providing a procedure that should return a map:

from autobahn.asyncio.component import Component, run

from config_service.config import Config

config = Config()

component = Component(transports=[{'type': 'rawsocket', 'url': config.wamp_router}], realm=config.wamp_realm)

@component.on_join
def joined(session, details):
    def get_settings():
        return {"param1": 1, "param2": True, "param3": 2.0, "param4": "string"}

    session.register(get_settings, config.wamp_prefix + '.get')

if __name__ == "__main__":
    run([component])

I'm trying to call the procedure and get data in C++:

 session->call("adt.settings.get")
                .then([&](boost::future<autobahn::wamp_call_result> result) {
                  try {
                    auto ret = result.get();
                    LOG_INFO() << ret.kw_argument<int>("param1");
                  } catch (const std::exception& e) {
                    LOG_ERROR() << e.what();
                    io.stop();
                    return;
                  }
...

This code doesn't work and I have an exception : param1 keyword argument doesn't exist

In the logs and debug mode I see that the map is wrapped into an array:

RawSocket handshake reply received
connect successful: valid handshake
RX preparing to receive message ..
TX message (122 octets) ...
TX message: hello ["adt", {"authid":"","authmethods":[],"roles":{"subscriber":{},"publisher":{},"callee":{"features":{"call_timeout":true}},"caller":{"features":{"call_timeout":true}}}}]
RX message (844 octets) ...
RX message received.
RX message: welcome [4951396766928797, {"x_cb_node":"043ac2c80af9-1","x_cb_worker":"worker001","x_cb_peer":"tcp4:172.22.0.1:35404","x_cb_pid":21,"realm":"adt","authid":"NN6M-VRGE-JSN9-3F64-E5TM-W35Y","authrole":"anonymous","authmethod":"anonymous","authprovider":"static","authextra":{"x_cb_node":"043ac2c80af9-1","x_cb_worker":"worker001","x_cb_peer":"tcp4:172.22.0.1:35404","x_cb_pid":21},"roles":{"broker":{"features":{"publisher_identification":true,"pattern_based_subscription":true,"session_meta_api":true,"subscription_meta_api":true,"subscriber_blackwhite_listing":true,"publisher_exclusion":true,"subscription_revocation":true,"payload_transparency":true,"payload_encryption_cryptobox":true,"event_retention":true}},"dealer":{"features":{"caller_identification":true,"pattern_based_registration":true,"session_meta_api":true,"registration_meta_api":true,"shared_registration":true,"call_canceling":true,"progressive_call_results":true,"registration_revocation":true,"payload_transparency":true,"testament_meta_api":true,"payload_encryption_cryptobox":true}}}}]
RX preparing to receive message ..
TX message (21 octets) ...
TX message: call [1, {}, "adt.settings.get"]
RX message (138 octets) ...
RX message received.
RX message: result [1, {"callee":7189193259188515,"callee_authid":"NR3E-VAHH-M4V3-4YXC-7AS9-3QRK","callee_authrole":"anonymous"}, [{"param1":1,"param2":true,"param3":2,"param4":"string"}]]
RX preparing to receive message ..

However I can't figure out the way to extract it properly.