Simple node "module" for doing marathon "service discovery"

mesos-dns.js

Promise = require('bluebird');
resolveSrv = Promise.promisify(require('dns').resolveSrv);

function fetchMarathonServiceBaseUrl(serviceName){
    var dns_url = ['_' + serviceName, "_tcp.marathon.mesos"].join('.');
    return resolveSrv(dns_url).then(function(addresses){
        // TODO: take an address at random ?
        // should we use some logic to choose addresses?
        var internalUrl = "http://" + addresses[0].name + ":" + addresses[0].port;
        return internalUrl
    })
}

module.exports = {
    fetchMarathonServiceBaseUrl: fetchMarathonServiceBaseUrl
};