feature(server) allow server to bind to specific ip's

.env-base

@@ -26,6 +26,10 @@ PLUGIN_DIRS="./node_modules/@speckle,./plugins"
 # if you have any firewalls set up (ie, ufw).
 PORT=3000
 
+# IP: The ip to listen to
+# Defaults to all IPs bound to this machine, and all IPv6 IPs if IPv6 is enabled.
+#IP=127.0.0.1
+
 # MAX_PROC: The maximum amount of service workers to start. If this is not specified,
 # Speckle will fork out as many as the machine's processor cores. To specify it,
 # just uncomment the line below.

server.js

@@ -128,7 +128,8 @@ if ( cluster.isMaster ) {
   /// /////////////////////////////////////////////////////////////////////
 
   var port = process.env.PORT || 3000
-  server.listen( port, ( ) => {
+  var ip = process.env.IP || null
+  server.listen( port, ip, ( ) => {
     logger.debug( chalk.yellow( `Speckle worker process ${process.pid} now running on port ${port}.` ) )
   } )
 }