Added Server class as a new facade for library, including HTTP endpoint compatible with express-graphql format

Author: vladar

src/Executor/ExecutionResult.php

@@ -3,7 +3,7 @@
 
 use GraphQL\Error\Error;
 
-class ExecutionResult
+class ExecutionResult implements \JsonSerializable
 {
     /**
      * @var array
@@ -20,6 +20,11 @@ class ExecutionResult
      */
     public $extensions;
 
+    /**
+     * @var callable
+     */
+    private $errorFormatter = ['GraphQL\Error\Error', 'formatError'];
+
     /**
      * @param array $data
      * @param array $errors
@@ -32,6 +37,16 @@ public function __construct(array $data = null, array $errors = [], array $exten
         $this->extensions = $extensions;
     }
 
+    /**
+     * @param callable $errorFormatter
+     * @return $this
+     */
+    public function setErrorFormatter(callable $errorFormatter)
+    {
+        $this->errorFormatter = $errorFormatter;
+        return $this;
+    }
+
     /**
      * @return array
      */
@@ -44,7 +59,7 @@ public function toArray()
         }
 
         if (!empty($this->errors)) {
-            $result['errors'] = array_map(['GraphQL\Error\Error', 'formatError'], $this->errors);
+            $result['errors'] = array_map($this->errorFormatter, $this->errors);
         }
 
         if (!empty($this->extensions)) {
@@ -53,4 +68,9 @@ public function toArray()
 
         return $result;
     }
+
+    public function jsonSerialize()
+    {
+        return $this->toArray();
+    }
 }