diffusion/src/node_modules/features/ping.js

Diffusion JavaScript client

var _implements = require('util/interface')._implements;
var Ping = require('../../features/ping');

var Services = require('services/services');

var Emitter = require('events/emitter');
var Result = require('events/result');

module.exports = _implements(Ping, function PingImpl(internal, currentTime) {
    currentTime = currentTime || Date.now;

    var ping = internal.getServiceLocator().obtain(Services.USER_PING);

    this.pingServer = function() {
        var emitter = new Emitter();
        var result = new Result(emitter);

        if (internal.checkConnected(emitter)) {
            var start = currentTime();

            ping.send(null, function(err) {
                if (err) {
                    emitter.error(err);
                } else {
                    var elapsed = currentTime() - start;

                    emitter.emit('complete', {
                        timestamp : start,
                        rtt : elapsed
                    });
                }
            });
        }

        return result;
    };
});