electron app - auto find port

packages/api/package.json

@@ -12,6 +12,7 @@
     "cross-env": "^6.0.3",
     "eslint": "^6.8.0",
     "express": "^4.17.1",
+    "find-free-port": "^2.0.0",
     "fs-extra": "^8.1.0",
     "http": "^0.0.0",
     "line-reader": "^0.4.0",

packages/api/src/index.js

@@ -5,14 +5,14 @@
 // "uuid": "^3.4.0",
 // "uws": "10.148.1"
 
-const processName = process.argv[2];
-if (processName && processName.endsWith('Process')) {
+const argument = process.argv[2];
+if (argument && argument.endsWith('Process')) {
   const proc = require('./proc');
 
-  const module = proc[processName];
+  const module = proc[argument];
   module.start();
 } else {
   const main = require('./main');
   
-  main.start();
+  main.start(argument);
 }

packages/api/src/main.js

@@ -4,6 +4,7 @@ const http = require('http');
 const cors = require('cors');
 const io = require('socket.io');
 const fs = require('fs');
+const findFreePort = require('find-free-port');
 
 const useController = require('./utility/useController');
 const socket = require('./utility/socket');
@@ -15,7 +16,7 @@ const tables = require('./controllers/tables');
 const sessions = require('./controllers/sessions');
 const jsldata = require('./controllers/jsldata');
 
-function start() {
+function start(argument = null) {
   console.log('process.argv', process.argv);
 
   const app = express();
@@ -42,7 +43,16 @@ function start() {
     });
   }
 
-  server.listen(3000);
+  if (argument == '--dynport') {
+    findFreePort(53911, function (err, port) {
+      server.listen(port, () => {
+        console.log(`DbGate API listening on port ${port}`);
+        process.send({ msgtype: 'listening', port });
+      });
+    });
+  } else {
+    server.listen(3000);
+  }
 }
 
 module.exports = { start };