How to subscribe a client to a rsocket server? - spring-boot

Question

My goal is to subscribe a client to a server events SSE. Clients will use WebSocket protocol, thus I use: spring.rsocket.server.transport: websocket
The analog on blocking IO stack:
#Configuration
#EnableWebSocketMessageBroker
class WebSocketConfiguration: WebSocketMessageBrokerConfigurer {
override fun configureMessageBroker(registry: MessageBrokerRegistry) {
registry.enableSimpleBroker("/topic")
registry.setApplicationDestinationPrefixes("/app")
}
override fun registerStompEndpoints(registry: StompEndpointRegistry) {
registry.addEndpoint("/websocket")
.setAllowedOrigins("*")
.withSockJS();
}
}
Usage:
#Service
class MessagingService(private val simpMessagingTemplate: SimpMessagingTemplate) {
private val logger = KotlinLogging.logger {}
fun notify(baseEvent: BaseEvent) {
logger.debug { "Sending an event $baseEvent" }
simpMessagingTemplate.convertAndSend("/topic/events", baseEvent)
}
}
Client code:
function connect() {
var socket = new SockJS('/websocket');
stompClient = Stomp.over(socket);
stompClient.connect({}, function (frame) {
setConnected(true);
console.log('Connected: ' + frame);
stompClient.subscribe('/topic/events', function (event) {
console.log('Handled message from ws: ' + event)
showGreeting(JSON.parse(event.body));
});
});
}
Where simpMessagingTemplate pushes an event to connected clients.
I want to achieve the same with reactor and spring-boot-starter-rsocket which works with WebSocket also at client-server level.
Rsocket request-stream fits but in this case, I need eternal flux stream on server cause I don't know when an event will come. I don't know how to do it