Cakephp and Server Side Events - cakephp

Question

I've configured cakephp 2.6.3 with the events system.
Post data comes in via a controller method and is handled. This data is then passed to an event file as per their documentation
The listener is registering the event as I can write to the log from it. I have a server sent event setup, and I want to pass the resulting data from the listener to this controller method so it can be sent as an event. How do I do this?
Post Data 'Mocked' up event for testing in DataController: - I call this method via a URL to fire the event
public function test_event() {
$data = array(
'lat' => 'lattitude',
'lng' => 'longigiggi',
'msg' => 'my message here'
);
$this->autoRender = false;
$this->layout = false;
$event = new CakeEvent('Data.post.received', $this, array('data', $data));
$this->getEventManager()->dispatch($event);
}
Here is my Event Listener in Lib/Event/TradeData
public function implementedEvents() {
return array(
'Data.post.received' => 'fireThis',
);
}
public function fireThis($event){
CakeLog::write('debug', 'Event listener fired');
//how do I pass data from the event here to a controller method
// to propogate a server sent event in DataController->test_listener();
// The event is being triggered, as its writing to the log
}
DataController::test_listener();
public function test_listener($data = null) {
$trade = new EventController();
$this->getEventManager()->attach($trade);
$this->layout = false;
header('Content-Type: text/event-stream');
header('Cache-Control: no-cache');
$lat = $data['lat'];
$lng = $data['lng'];
$msg = $data['msg'];
$this->set(compact('lat', 'lng', 'msg'));
$this->render('/Elements/sse');
}
The view Elements/sse is configured correctly for Server Sent Events
<?php
echo "data: {\n";
echo "data: \"lat\": \"$lat\",\n";
echo "data: \"lng\": \"$lng\",\n";
echo "data: \"country\": \"$msg\"\n";
echo "data: }\n\n";
flush();
How do I render data to the same page that the server sent event will be listening to?

Answer 1

First, your Listener and raiser need to be attached somewhere other than in a controller method that you're going to call from the Listener. Maybe you already did this, but in your bootstrap.php file you should have something like:
// Load event listeners
App::uses('TradeData', 'Lib/Event');
App::uses('CakeEventManager', 'Event');
// Attach listeners.
CakeEventManager::instance()->attach(new TradeData());
Then, in the TradeData Listener you can call the controller (subject) method in the fireThis() function:
$event->subject->test_listener($event->data);
Also, you can simplify the data being passed to CakeEvent so it would look like this:
$event = new CakeEvent('Data.post.received', $this, $data);