Send Publish call from within a Controller

[teagup]

Hi, I'm working on a project requiring a notification to be sent every time a user takes an action from within a controller. I know it's possible to send publish requests from frontend javascript using a session.publish(); call, but I'm hoping to achieve the same kind of functionality from a controller. (ie user takes an action -> Controller gathers a list of users needing to be notified and does some other functionality -> Controller sends a publish call to Notification Topic for each user -> Notification Topic sends an appropriate message to each user.)

Thanks for the great bundle, Patrick

[JDare]

Hey Patrick,

Talking to the daemon from the controller is a little tricky as they are running in separate processes. Off the top of my head theres a few approaches to the problem, either using a work queue or just opening a web socket from the request.

The first and maybe more "proper" way to do it, is using process to process communication (something like zeromq or a work queue such as beanstalk). Although this would involve writing more code on the server side to handle these requests as well.

The second one can be achieved by opening a websocket from the request directly to the server daemon, include a special "admin" payload that can notify the daemon that a controller request has been made and it must notify the other connections. https://github.com/Devristo/phpws apparently contains a websocket client, so maybe give that a go.

Thats all I can think of at the moment, but its definitely not a definitive list as i'm sure theres plenty of other methods available.

[teagup]

Thanks for the speedy reply! I think I'll try out using zeromq or beanstalk, since we're going to be deploying on a cluster of servers. I'll let you know what I come up with as far as a generic solution.

[jponnoua]

Hello,

I'd like to publish data from the server to the clients, through the subscribed topics. As you mentionned above, there is an issue of context. This is not my case: I'd like to publish a message when a disconnection is performed (onClientDisconnect method triggered from the server).

Do you have any idea ?

Regards,

Julien.

[jjsaunier]

I'm not sure to understand, you want web socket client on php server side ?

[jponnoua]

Yes, in the EventListener, into the method public function onClientDisconnect(ClientEvent $event), I'd like to publish a message to my friend list to let them know the user will be disconnected.

[jjsaunier]

You must achieve this with unSubscribe method from topic instead of onClientDisconnect because onClientClientDisconnect is out of scope of WampServer. I mean you don't have topic id (channel) and subscribers, you are in IoServer (more details here : http://socketo.me/docs/design).

The only things you have to do, is to detect from client when the user trigger unload event and then call session unsubscribe.

[jponnoua]

Ok, thank you !

[jjsaunier]

If you are interested I have fork ClankBundle to my own organisation in order to maintain it actively, because currently this bundle is not maintained.

You can see it here : https://github.com/GeniusesOfSymfony/WebSocketBundle