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omega.js
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'use strict';
var map = require('async/map');
/**
* A nope function allows for an optional callback pattern.
*
* @type {Function}
* @private
*/
function nope() { }
/**
* Omega supreme integration.
*
* @param {Primus} primus Primus instance
* @api private
*/
module.exports = function forwards(primus) {
if (!primus.forward) return;
var metroplex = primus.metroplex
, forward = primus.forward;
/**
* Broadcast a message to every connected server in the cluster.
*
* @param {Mixed} msg Message to broadcast.
* @param {Function} fn Completion callback.
* @returns {Forward}
* @api public
*/
forward.broadcast = function broadcast(msg, fn) {
fn = fn || nope;
metroplex.servers(function servers(err, list) {
if (err) return fn(err);
forward(list, msg, fn);
});
return forward;
};
/**
* Broadcast a message to a range of users in the cluster.
*
* @param {Array} ids The ids that need to be resolved.
* @param {Mixed} msg Message to broadcast.
* @param {Function} fn Completion callback.
* @returns {Forward}
* @api public
*/
forward.sparks = function sparks(ids, msg, fn) {
fn = fn || nope;
metroplex.sparks(ids, function sparks(err, servers) {
if (err) return fn(err);
servers = servers.reduce(function fn(memo, address, i) {
//
// Filter out the dead sparks.
//
if (!address) return memo;
memo[address] = memo[address] || [];
memo[address].push(ids[i]);
return memo;
}, {});
map(Object.keys(servers), function iteratee(server, next) {
forward(server, msg, servers[server], next);
}, function calculate(err, reached) {
if (err) return fn(err, reached);
fn(err, reached.reduce(function reduce(memo, reach) {
memo.send += reach.send || 0;
return memo;
}, { ok: true, send: 0 }));
});
});
return forward;
};
/**
* Forward the message to a specific spark
*
* @param {String} id Spark id
* @param {Mixed} msg Message to broadcast.
* @param {Function} fn Completion callback.
* @returns {Forward}
* @api public
*/
forward.spark = function spark(id, msg, fn) {
fn = fn || nope;
metroplex.spark(id, function spark(err, server) {
if (err) return fn(err);
forward(server, msg, id, fn);
});
return forward;
};
};