susi-forge/src/server/main.js

SUSIs forge

var CloudController = {

    nodes: [],

    init: function(){
        susi.registerProcessor("registerNewNode@cloud", this.registerNewNode.bind(this));
        susi.registerProcessor("cloud::getNodes", this.getNodes.bind(this));
    },

    registerNewNode: function(event){
        if(!event.payload || !event.payload.nodeId){
            throw "CloudCode: registerNewNode: you must specify event.payload.nodeId";
        }

        for(var i=0;i<this.nodes.length;i++){
            if(this.nodes[i].nodeId === event.payload.nodeId){
                throw "CloudCode: you are allready registered!";
            }
        }

        this.nodes.push({
            nodeId: event.payload.nodeId,
            sessionId: event.sessionid
        });
        
        this.setupNodeRemover(event.sessionid);
        

        log("CloudCode: added node "+event.payload.nodeId);
        
        susi.publish({
            topic: "cloud::node::new",
            payload: event.payload.nodeId
        });

        event.payload.success = true;
        susi.ack(event);
    },

    setupNodeRemover: function(sessionId){
        var self = this;
        var sessionDiedConsumerId = susi.registerConsumer("session::died",function(event){
            if(event.payload === sessionId){
                susi.unregisterConsumer(sessionDiedConsumerId); // unregister yourself
                for(var i=0; i<self.nodes.length; i++){
                    if(self.nodes[i].sessionId === sessionId){
                        log("CloudCode: removed node "+self.nodes[i].nodeId);
                        var node = self.nodes[i];
                        self.nodes.remove(i);
                        susi.publish({
                            topic: "cloud::node::lost",
                            payload: node.nodeId
                        });
                        break;
                    }
                }        
            }
        });
    },

    getNodes: function(event){
        event.payload = this.nodes;
        susi.ack(event);
    }
};

// http://ejohn.org/blog/javascript-array-remove/
Array.prototype.remove = function(from, to) {
    var rest = this.slice((to || from) + 1 || this.length);
    this.length = from < 0 ? this.length + from : from;
    return this.push.apply(this, rest);
};

CloudController.init();