added version method to AProtocol classes

Author: transistive

src/protocol/AProtocol.php

@@ -16,7 +16,6 @@
  */
 abstract class AProtocol
 {
-
     protected const SUCCESS = 0x70;
     protected const FAILURE = 0x7F;
     protected const IGNORED = 0x7E;
@@ -87,4 +86,10 @@ protected function read(?int &$signature)
         return $output;
     }
 
+    /**
+     * Returns the bolt protocol version as a string.
+     *
+     * @return string
+     */
+    abstract public function getVersion(): string;
 }

src/protocol/V1.php

@@ -176,4 +176,8 @@ public function reset(): array
         return $message;
     }
 
+    public function getVersion(): string
+    {
+        return '1';
+    }
 }

src/protocol/V2.php

@@ -12,5 +12,8 @@
  */
 class V2 extends V1
 {
-
+    public function getVersion(): string
+    {
+        return '2';
+    }
 }

src/protocol/V3.php

@@ -177,4 +177,8 @@ public function goodbye()
         $this->connection->disconnect();
     }
 
+    public function getVersion(): string
+    {
+        return '3';
+    }
 }

src/protocol/V4.php

@@ -101,4 +101,8 @@ public function discard(...$args): array
         return $message;
     }
 
+    public function getVersion(): string
+    {
+        return '4.0';
+    }
 }

src/protocol/V4_1.php

@@ -26,4 +26,8 @@ public function hello(...$args): array
         return parent::hello(...$args);
     }
 
+    public function getVersion(): string
+    {
+        return '4.1';
+    }
 }

src/protocol/V4_2.php

@@ -12,5 +12,8 @@
  */
 class V4_2 extends V4_1
 {
-
+    public function getVersion(): string
+    {
+        return '4.2';
+    }
 }

src/protocol/V4_3.php

@@ -46,4 +46,9 @@ public function route(...$args): array
 
         return $message;
     }
+
+    public function getVersion(): string
+    {
+        return '4.3';
+    }
 }

src/protocol/V4_4.php

@@ -22,4 +22,8 @@ public function route(...$args): array
         return parent::route(...$args);
     }
 
+    public function getVersion(): string
+    {
+        return '4.4';
+    }
 }