first commit

plugins/redisBeacon.js

@@ -0,0 +1,67 @@
+var log = require('../core/log.js');
+var util = require('../core/util');
+var config = util.getConfig();
+var redisBeacon = config.redisBeacon;
+var watch = config.watch;
+
+var subscriptions = require('../subscriptions');
+var _ = require('lodash');
+
+var redis = require("redis");
+
+var Actor = function(done) {
+  _.bindAll(this);
+
+  this.market = [
+    watch.exchange,
+    watch.currency,
+    watch.asset
+  ].join('-');
+
+  this.init(done);
+}
+
+// This actor is dynamically build based on
+// what the config specifies it should emit.
+// 
+// This way we limit overhead because Gekko
+// only binds to events redis is going to
+// emit.
+
+var proto = {};
+_.each(redisBeacon.broadcast, function(e) {
+  // grab the corresponding subscription 
+  var subscription = _.find(subscriptions, function(s) { return s.event === e });
+
+  if(!subscription)
+    util.die('Gekko does not know this event:' + e);
+
+  var channel = redisBeacon.channelPrefix + subscription.event
+
+  proto[subscription.handler] = function(message, cb) {
+    if(!_.isFunction(cb))
+      cb = _.noop;
+
+    this.emit(channel, {
+      market: this.market,
+      data: message
+    }, cb);
+  };
+
+}, this)
+
+Actor.prototype = proto;
+
+Actor.prototype.init = function(done) {
+  this.client = redis.createClient(redisBeacon.port, redisBeacon.host);
+  this.client.on('ready', _.once(done));
+}
+
+Actor.prototype.emit = function(channel, message) {
+  log.debug('Going to publish to redis channel:', channel);
+
+  var data = JSON.stringify(message);
+  this.client.publish(channel, data);
+}
+
+module.exports = Actor;