Introduce command line arguments

README.md

@@ -57,12 +57,13 @@ If you want to install a version of this demo in your local Lightstreamer Server
 * Alternatively, you may plug the *robust* versions of the Proxy Data Adapter: go to the `deployment/Deployment_LS(robust)` folder and copy the `ChatAdapterNode` directory and all of its files into the `adapters` folder.
 * Install the lightstreamer-adapter module. 
     * Create a directory where to deploy the Node.js Remote Adapter and let call it `Deployment_Node_Remote_Adapter`.
-    * Go to the `Deployment_Node_Remote_Adapter` folder and launch the command:<BR/>
+    * Go to the `Deployment_Node_Remote_Adapter` folder and launch the commands:<BR/>
     `> npm install lightstreamer-adapter`<BR/>
+    `> npm install command-line-args`<BR/>
     * Download the `nodechat.js` and the `robustconnect.js` files from this project and copy them into the `Deployment_Node_Remote_Adapter` folder.
 * Launch Lightstreamer Server. The Server startup will complete only after a successful connection between the Proxy Data Adapter and the Remote Data Adapter.
 * Launch the Node.js Remote Adapter: go to the `Deployment_Node_Remote_Adapter` folder and launch:<BR/>
-`> node nodechat.js`<BR/>
+`> node nodechat.js --host localhost --metadata_rrport 8003 --data_rrport 8001 --data_notifport 8002`<BR/>
 * Test the Adapter, launching the [Lightstreamer - Basic Chat Demo - HTML Client](https://github.com/Lightstreamer/Lightstreamer-example-Chat-client-javascript) listed in [Clients Using This Adapter](https://github.com/Lightstreamer/Lightstreamer-example-Chat-adapter-node#clients-using-this-adapter).
     * To make the [Lightstreamer - Basic Chat Demo - HTML Client](https://github.com/Lightstreamer/Lightstreamer-example-Chat-client-javascript) front-end pages get data from the newly installed Adapter Set, you need to modify the front-end pages and set the required Adapter Set name to PROXY_NODECHAT when creating the LightstreamerClient instance. So edit the `lsClient.js` file of the *Basic Chat Demo* front-end deployed under `Lightstreamer/pages/ChatDemo` and replace:<BR/>
 `var lsClient = new LightstreamerClient(protocolToUse+"//localhost:"+portToUse,"CHAT");`<BR/>
@@ -94,5 +95,5 @@ should become like this:<BR/>
 
 ## Lightstreamer Compatibility Notes
 
-* Compatible with Lightstreamer SDK for Node.js Adapters since 1.3
+* Compatible with Lightstreamer SDK for Node.js Adapters version 1.3 or newer
 - For a version of this example compatible with Lightstreamer SDK for Node.js Adapters version 1.0, please refer to [this tag](https://github.com/Lightstreamer/Lightstreamer-example-Chat-adapter-node/tree/for_Lightstreamer_5.1).

nodechat.js

@@ -19,12 +19,7 @@ var
   DataProvider = require('lightstreamer-adapter').DataProvider,
   net = require('./robustconnect'),
   inspect = require('util').inspect,
-
-  // Remote proxy host and ports
-  HOST = 'localhost',
-  REQ_RESP_PORT = 8001,
-  WRITE_PORT = 8002,
-  META_PORT = 8003,
+  commandLineArgs = require('command-line-args'),
 
   // Request/response socket channel
   reqRespStream,
@@ -46,21 +41,30 @@ var
 
   // User data just for the demo
   sessions = [];
+
+  const optionDefinitions = [
+    { name: 'host', type: String },
+    { name: 'metadata_rrport', type: Number },
+    { name: 'data_rrport', type: Number },
+    { name: 'data_notifport', type: Number },
+  ];
+
+  const options = commandLineArgs(optionDefinitions);
 
 // Create socket connections
-net.createConnection(REQ_RESP_PORT, HOST, function(stream) {
+net.createConnection(options.data_rrport, options.host, function(stream) {
   reqRespStream = stream;
   if(notifyStream) {
     initDataProvider();
   }
 });
-net.createConnection(WRITE_PORT, HOST, function(stream) {
+net.createConnection(options.data_notifport, options.host, function(stream) {
   notifyStream = stream;
   if(reqRespStream) {
     initDataProvider();
   }
 });
-net.createConnection(META_PORT, HOST, function(stream) {
+net.createConnection(options.metadata_rrport, options.host, function(stream) {
   metadataStream = stream;
   initMetadataProvider();
 });
@@ -75,7 +79,7 @@ function initDataProvider() {
     console.log("Subcribed item: " + itemName);
     if (itemName === "chat_room") {
       subscribed = true;
-      response.success();    
+      response.success();
     } else {
       response.error("No such item", "subscription");
     }

package.json

@@ -1,6 +1,6 @@
 {
   "name": "lightstreamer-adapter-chat",
-  "version": "1.0.0",
+  "version": "1.1.0",
   "description": "Hello world application showing how to develop simple Lightstreamer adapters based on node.",
   "keywords": [
     "lightstreamer",
@@ -40,6 +40,7 @@
   ],
 
   "dependencies": {
+    "command-line-args": "^5.0.2",
     "lightstreamer-adapter": ">=1.3.0"
   }
 }