SocketIO: Receive JSON

[michaelcontento]

This issue is very similar to #14623, but can be solved independently.

Currently it's impossible for the SIODelegate to distinguish if the client has sent a plain string or a serialized (JSON) object.

As a example I'm sending this with the official JS client:

socket.emit('test-str', 'string');
socket.emit('test-obj', {type: 'obj'});

And with a delegate like:

void ServerImpl::fireEventToScript(cocos2d::network::SIOClient* _client, const std::string& event, const std::string& data)
{
    CCLOG("GOT %s %s", event.c_str(), data.c_str());
}

The log will contain:

GOT test-str "string"
GOT test-obj {"type":"obj"}

A possible solution for this could be to add another parameter to fireEventToScript indicating that data contains a serialized JSON object:

void ServerImpl::fireEventToScript(cocos2d::network::SIOClient* _client, const std::string& event, const std::string& data, const bool containsJson)
{
    if (containsJson) {
        // I know that I might use rapidjson here
    } else {
        // It's not safe to use rapidjson on data
    }
}

NOTE: As soon as we implement #14619, we should support JSON objects there too!

[michaelcontento]

Closed as outdated and change no longer required