Checking port availability

Author: usernameComputer01

composer.json

@@ -15,6 +15,7 @@
     "php": "^7.3 || ^8.0",
     "ext-curl": "*",
     "ext-json": "*",
+    "ext-sockets": "*",
     "ext-zip": "*",
     "symfony/polyfill-mbstring": "^1.12",
     "symfony/process": "^5.0 || ^6.0 || ^7.0"

lib/Chrome/ChromeDriverService.php

@@ -38,6 +38,7 @@ public static function createDefaultService()
         if (!$port) {
             $port = static::DEFAULT_PORT;
         }
+        self::checkPortIsAvail($port);
         $args = ['--port=' . $port];
 
         return new static($pathToExecutable, $port, $args);

lib/Firefox/FirefoxDriverService.php

@@ -35,6 +35,7 @@ public static function createDefaultService()
         if (!$port) {
             $port = static::DEFAULT_PORT;
         }
+        self::checkPortIsAvail($port);
         $args = ['-p=' . $port];
 
         return new static($pathToExecutable, $port, $args);

lib/Remote/Service/DriverService.php

@@ -180,4 +180,26 @@ private function isExecutable(string $filename): bool
 
         return false;
     }
+
+    /**
+     * @param int $port
+     * @throws RuntimeException
+     */
+    protected static function checkPortIsAvail(int $port)
+    {
+        $errTest = function ($sock) use ($port) {
+            if (!$sock) {
+                $errCode = socket_last_error();
+                $errMsg = $errCode ? socket_strerror($errCode) : 'Unknown';
+                throw RuntimeException::forError("Port $port is not available: $errMsg");
+            }
+        };
+
+        $sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
+        $errTest($sock);
+        $errTest(socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1));
+        $errTest(socket_bind($sock, '127.0.0.1', $port));
+        $errTest(socket_listen($sock));
+        socket_close($sock);
+    }
 }