Issue #204: Exit loops when disconnected

This change should help to exit stuck loops, when the library is not connected to the remote server anymore.

- Adds a new function to check if a connection is established or not
- Adds a PHPUnit test for the new function
- Adds the connection status as condition to loops in order to abort, when it disconnected

src/Adapter/ServerQuery.php

@@ -139,7 +139,7 @@ public function request(string $cmd, bool $throw = true): Reply
         do {
             $str = $this->getTransport()->readLine();
             $rpl[] = $str;
-        } while ($str->section(TeamSpeak3::SEPARATOR_CELL) != TeamSpeak3::ERROR);
+        } while ($this->getTransport()->is_connected() AND $str->section(TeamSpeak3::SEPARATOR_CELL) != TeamSpeak3::ERROR);
 
         $this->getProfiler()->stop();
 
@@ -164,7 +164,7 @@ public function wait(): Event
 
         do {
             $evt = $this->getTransport()->readLine();
-        } while (!$evt->section(TeamSpeak3::SEPARATOR_CELL)->startsWith(TeamSpeak3::EVENT));
+        } while ($this->getTransport()->is_connected() AND !$evt->section(TeamSpeak3::SEPARATOR_CELL)->startsWith(TeamSpeak3::EVENT));
 
         return new Event($evt, $this->getHost());
     }

src/Transport/TCP.php

@@ -110,6 +110,16 @@ public function disconnect(): void
         Signal::getInstance()->emit(strtolower($this->getAdapterType()) . "Disconnected");
     }
 
+    /**
+     * Returns true, if the connection to a remote server is established.
+     *
+     * @return bool
+     */
+    public function is_connected(): bool
+    {
+        return ($this->stream === null) ? false : true;
+    }
+
     /**
      * Reads data from the stream.
      *

tests/Transport/TCPTest.php

@@ -3,6 +3,7 @@
 namespace PlanetTeamSpeak\TeamSpeak3Framework\Tests\Transport;
 
 use PHPUnit\Framework\TestCase;
+use PlanetTeamSpeak\TeamSpeak3Framework\Adapter\MockServerQuery;
 use PlanetTeamSpeak\TeamSpeak3Framework\Adapter\ServerQuery;
 use PlanetTeamSpeak\TeamSpeak3Framework\Exception\ServerQueryException;
 use PlanetTeamSpeak\TeamSpeak3Framework\Transport\TCP;
@@ -91,6 +92,25 @@ public function testGetStream()
         $this->assertNull($transport->getStream());
     }
 
+    /**
+     * @throws AdapterException
+     */
+    protected function createMockServerQuery(): MockServerQuery
+    {
+        return new MockServerQuery(['host' => '0.0.0.0', 'port' => 9987]);
+    }
+
+    /**
+     * Tests if the connection status gets properly returned.
+     */
+    public function testConnectionStatus()
+    {
+        $mockServerQuery = $this->createMockServerQuery();
+        $this->assertTrue($mockServerQuery->getTransport()->is_connected());
+        $mockServerQuery->getTransport()->disconnect();
+        $this->assertFalse($mockServerQuery->getTransport()->is_connected());
+    }
+
     /**
      * @throws TransportException
      * @throws ServerQueryException