Allocate two ports to each worker.

lib/cli.js

@@ -31,6 +31,14 @@ program
     , 'restart worker only if it stays alive for longer than this'
     , Number
     , 10000)
+  .option('--min-port <port>'
+    , 'minimum port number for worker use'
+    , Number
+    , 7400)
+  .option('--max-port <port>'
+    , 'maximum port number for worker use'
+    , Number
+    , 7800)
   .action(function() {
     var serials = cliutil.allUnknownArgs(arguments)
       , options = cliutil.lastArg(arguments)
@@ -47,16 +55,18 @@ program
     , restartThreshold: options.restartThreshold
     , restartTimeout: 1000
     , killTimeout: 10000
+    , ports: cliutil.range(options.minPort, options.maxPort)
     , filter: function(device) {
         return serials.length === 0 || serials.indexOf(device.id) !== -1
       }
-    , fork: function(device) {
+    , fork: function(device, ports) {
         var fork = require('child_process').fork
         return fork(__filename, [
           'device', device.id
         , '--provider', options.name
         , '--connect-sub', options.connectSub.join(',')
         , '--connect-push', options.connectPush.join(',')
+        , '--ports', ports.join(',')
         ])
       }
     , endpoints: {
@@ -78,6 +88,9 @@ program
   .option('-p, --connect-push <endpoint>'
     , 'push endpoint'
     , cliutil.list)
+  .option('--ports <ports>'
+    , 'ports allocated to worker'
+    , cliutil.list)
   .action(function(serial, options) {
     if (!options.connectSub) {
       this.missingArgument('--connect-sub')
@@ -88,10 +101,14 @@ program
     if (!options.provider) {
       this.missingArgument('--provider')
     }
+    if (!options.provider) {
+      this.missingArgument('--ports')
+    }
 
     require('./roles/device')({
       serial: serial
     , provider: options.provider
+    , ports: options.ports
     , endpoints: {
         sub: options.connectSub
       , push: options.connectPush

lib/roles/provider.js

@@ -93,7 +93,8 @@ module.exports = function(options) {
   function maybeConnect(device) {
     if (isConnectable(device) && !isConnected(device)) {
       log.info('Spawning device worker "%s"', device.id)
-      var proc = options.fork(device)
+      var ports = options.ports.splice(0, 2)
+        , proc = options.fork(device, ports)
 
       function errorListener(err) {
         log.error('Device worker "%s" had an error: %s',
@@ -101,9 +102,7 @@ module.exports = function(options) {
       }
 
       function exitListener(code, signal) {
-        var data = workers[device.id]
+        var worker = cleanupWorker(device.id)
-        delete workers[device.id]
-        counter -= 1
         switch (code) {
           case 0:
             log.info('Device worker "%s" stopped cleanly', device.id)
@@ -113,7 +112,7 @@ module.exports = function(options) {
               , device.id)
             break
           default:
-            if (Date.now() - data.started < options.restartThreshold) {
+            if (Date.now() - worker.started < options.restartThreshold) {
               log.error(
                 'Device worker "%s" died with exit code %d, ' +
                 'NOT restarting due to threshold of %dms not being met'
@@ -157,6 +156,7 @@ module.exports = function(options) {
         device: device
       , proc: proc
       , started: Date.now()
+      , ports: ports
       , unbind: function() {
           proc.removeListener('error', errorListener)
           proc.removeListener('exit', exitListener)
@@ -204,10 +204,8 @@ module.exports = function(options) {
         worker = workers[id]
 
     function onExit() {
-      delete workers[id]
+      cleanupWorker(id)
       log.info('Gracefully killed device worker "%s"', id)
-      counter -= 1
-      boast()
       deferred.resolve()
     }
 
@@ -227,10 +225,8 @@ module.exports = function(options) {
       , worker = workers[id]
 
     function onExit() {
-      delete workers[id]
+      cleanupWorker(id)
       log.warn('Force killed device worker "%s"', id)
-      counter -= 1
-      boast()
       deferred.resolve()
     }
 
@@ -262,6 +258,15 @@ module.exports = function(options) {
       })
   }
 
+  function cleanupWorker(id) {
+    var worker = workers[id]
+    delete workers[id]
+    Array.prototype.push.apply(options.ports, worker.ports)
+    counter -= 1
+    boast()
+    return worker
+  }
+
   function boast() {
     log.info('Providing %d device(s)', counter)
   }

lib/util/cliutil.js

@@ -9,3 +9,12 @@ module.exports.allUnknownArgs = function(args) {
 module.exports.lastArg = function(args) {
   return args[args.length - 1]
 }
+
+module.exports.range = function(from, to) {
+  var items = []
+    , i
+  for (i = from; i <= to; ++i) {
+    items.push(i)
+  }
+  return items
+}