Rename "roles" to "units". Put units in their own folders.

lib/units/triproxy/index.js

@@ -0,0 +1,44 @@
+var zmq = require('zmq')
+
+var logger = require('../../util/logger')
+var lifecycle = require('../../util/lifecycle')
+
+module.exports = function(options) {
+  var log = logger.createLogger('triproxy')
+
+  if (options.name) {
+    logger.setGlobalIdentifier(options.name)
+  }
+
+  function proxy(to) {
+    return function() {
+      to.send([].slice.call(arguments))
+    }
+  }
+
+  // App/device output
+  var pub = zmq.socket('pub')
+  pub.bindSync(options.endpoints.pub)
+  log.info('PUB socket bound on', options.endpoints.pub)
+
+  // Coordinator input/output
+  var dealer = zmq.socket('dealer')
+  dealer.bindSync(options.endpoints.dealer)
+  dealer.on('message', proxy(pub))
+  log.info('DEALER socket bound on', options.endpoints.dealer)
+
+  // App/device input
+  var pull = zmq.socket('pull')
+  pull.bindSync(options.endpoints.pull)
+  pull.on('message', proxy(dealer))
+  log.info('PULL socket bound on', options.endpoints.pull)
+
+  lifecycle.observe(function() {
+    try {
+      pub.close()
+      dealer.close()
+      pull.close()
+    }
+    catch (err) {}
+  })
+}