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/**
*
* @fileOverview Event listener singleton. Provides vboxEventListener
* @author Ian Moore (imoore76 at yahoo dot com)
* @version $Id: eventlistener.js 596 2015-04-19 11:50:53Z imoore76 $
* @copyright Copyright (C) 2010-2015 Ian Moore (imoore76 at yahoo dot com)
*/
/**
* vboxEventListener
*
* Polls vboxwebsrv for pending events and triggers
* events on $('#vboxPane')
*
* @namespace vboxEventListener
*/
var vboxEventListener = {
// Timeout
timeout: 20,
// Not initially running
_running: false,
// persistent request data
_persist: {},
// List of machines to subscribe to at runtime
_subscribeList: [],
// Watchdog to make sure vboxEventListener is still
// running and attempting to get events
_watchdog: {
lastRun: 0,
start: function() {
window.setInterval(function() {
if(vboxEventListener._running &&
((new Date().getTime()/1000) - vboxEventListener._watchdog.lastRun > vboxEventListener.timeout)) {
phpVirtualBoxFailure(' (EventListener watchdog failure)');
vboxEventListener.stop();
window.clearInterval(vboxEventListener._watchdog.timer);
}
}, vboxEventListener.timeout)
},
stop: function() {
window.clearInterval(vboxEventListener._watchdog.timer);
}
},
// Since VirtualBox handles to event listener objects are persistent,
// calls using the same handle should be synchronous
_requestQueue: {
requests: [],
running: false,
// run timer
timer: window.setInterval(function(){
vboxEventListener._requestQueue.run();
}, 5000), // 5 seconds
// Add a request to the queue
addReq: function(q) {
var d = $.Deferred();
vboxEventListener._requestQueue.requests.push({'request':q,'deferred':d});
vboxEventListener._requestQueue.run();
return d.promise();
},
// Run through the queue
run : function() {
// Already running through queue
if(vboxEventListener._requestQueue.running) return;
vboxEventListener._requestQueue.running = true;
vboxEventListener._requestQueue.runReq();
},
// Run a single request, removing it from the queue
runReq: function() {
var r = vboxEventListener._requestQueue.requests.shift();
if(r) {
$.when(r.request())
.done(r.deferred.resolve)
.fail(r.deferred.reject)
.always(vboxEventListener._requestQueue.runReq);
} else {
vboxEventListener._requestQueue.running = false;
}
}
},
/**
* Start event listener loop
* @param {Array} vmlist - list of VM ids to subscribe to
*/
start: function(vmlist) {
// Already started?
if(vboxEventListener._running) return;
// Get timeout if exists
if($('#vboxPane').data('vboxConfig').eventListenerTimeout)
vboxEventListener.timeout = $('#vboxPane').data('vboxConfig').eventListenerTimeout;
vboxEventListener._running = true;
var started = $.Deferred();
// Subscribe to events and start main loop
$.when(vboxAjaxRequest('subscribeEvents',{vms:vmlist})).done(function(d) {
vboxEventListener._persist = d.persist;
$.when(vboxEventListener._getEvents()).done(function(){
vboxEventListener._watchdog.start();
started.resolve();
});
});
return started.promise();
},
/**
* Subscribe to a single machine's events. This should happen
*
* @param {String} vmid - ID of VM to subscribe to
*/
subscribeVMEvents: function(vmid) {
// Push into list
vboxEventListener._subscribeList.push(vmid);
// Add subscription request to queue
return vboxEventListener._requestQueue.addReq(function(){
if(!vboxEventListener._subscribeList.length) return;
var vms = vboxEventListener._subscribeList.concat();
vboxEventListener._subscribeList = [];
var vmEvents = $.Deferred();
$.when(vboxAjaxRequest('machineSubscribeEvents', {'vms':vms},{'persist':vboxEventListener._persist})).done(function(d){
// Always set persistent request data
vboxEventListener._persist = d.persist;
}).always(function(){
vmEvents.resolve();
});
return vmEvents.promise();
});
},
/**
* Stop event listener loop and unsubscribe from events
*/
stop: function() {
if(!vboxEventListener._running)
return;
window.clearTimeout(vboxEventListener._running);
vboxEventListener._running = false;
vboxEventListener._watchdog.stop();
// Unsubscribe from events. Returns a deferred object
return vboxEventListener._requestQueue.addReq(function(){
return vboxAjaxRequest('unsubscribeEvents', {}, {'persist':vboxEventListener._persist});
});
},
/**
* Main loop - get pending events
*/
_getEvents: function(){
// Don't do anything if we aren't running anymore
if(!vboxEventListener._running) return;
// Add to queue
return vboxEventListener._requestQueue.addReq(function(){
return $.when(new Date().getTime(), vboxAjaxRequest('getEvents',{}, {'persist':vboxEventListener._persist})).done(function(lastTime,d) {
// Don't do anything if this is not running
if(!vboxEventListener._running) return;
// Check for valid result
if(!d || !d.success) {
if(vboxEventListener._running)
phpVirtualBoxFailure();
return;
}
// Check key to make sure this isn't a stale
// response from a previously selected server
if(!d.key || (d.key != $('#vboxPane').data('vboxConfig').key)) return;
// Tell the watch dog that we were run
vboxEventListener._watchdog.lastRun = (new Date().getTime() / 1000);
// Always set persistent request data
vboxEventListener._persist = d.persist;
// Loop through each event triggering changes
if(d.responseData && d.responseData.length) {
// Trigger each event individually
for(var i = 0; i < d.responseData.length; i++) {
// Trigger raw vbox events
$('#vboxPane').trigger('vbox' + d.responseData[i].eventType, [d.responseData[i]]);
}
// Trigger event list queue
$('#vboxPane').trigger('vboxEvents', [d.responseData]);
}
// Wait at most 3 seconds
var wait = Math.min(3000,3000 - ((new Date().getTime()) - lastTime));
if(wait <= 0) {
vboxEventListener._running = true;
vboxEventListener._getEvents();
}
else {
vboxEventListener._running = window.setTimeout(vboxEventListener._getEvents, wait);
}
});
});
}
};
// Stop event listener on window unload
$(document).ready(function() {
$(window).on('unload',function() {
vboxEventListener.stop();
});
});
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