Merge pull request #60 from overleaf/ho-pubsub-healthcheck

Ho pubsub healthcheck

services/real-time/app.coffee

@@ -134,20 +134,18 @@ if Settings.forceDrainMsDelay?
 if Settings.continualPubsubTraffic
 	console.log "continualPubsubTraffic enabled"
 
-	redisClients = [redis.createClient(Settings.redis.documentupdater), redis.createClient(Settings.redis.realtime)]
+	pubsubClient = redis.createClient(Settings.redis.pubsub)
+	clusterClient = redis.createClient(Settings.redis.websessions)
 
 	publishJob = (channel, callback)->
 		checker = new HealthCheckManager(channel)
 		logger.debug {channel:channel}, "sending pub to keep connection alive"
 		json = JSON.stringify({health_check:true, key: checker.id, date: new Date().toString()})
-		jobs = _.map redisClients, (rclient)->
-			return (cb)->
-				rclient.publish channel, json, (err)->
-					if err?
-						logger.err {err, channel}, "error publishing pubsub traffic to redis"
-					return cb(err)
-
-		async.series jobs, callback
+		pubsubClient.publish channel, json, (err)->
+			if err?
+				logger.err {err, channel}, "error publishing pubsub traffic to redis"
+			clusterClient.publish "cluster-continual-traffic", {keep: "alive"}, callback
+
 
 	runPubSubTraffic = ->
 		async.map ["applied-ops", "editor-events"], publishJob, (err)->