Add applicationName option which gets set to the logstash @type field

src/Monolog/Formatter/LogstashFormatter.php

@@ -23,10 +23,15 @@ use Monolog\Logger;
 class LogstashFormatter extends NormalizerFormatter
 {
     /**
-     * @var string the name of the system for the Gelf log message
+     * @var string the name of the system for the Logstash log message, used to fill the @source field
      */
     protected $systemName;
 
+    /**
+     * @var string an application name for the Logstash log message, used to fill the @type field
+     */
+    protected $applicationName;
+
     /**
      * @var string a prefix for 'extra' fields from the Monolog record (optional)
      */
@@ -38,12 +43,13 @@ class LogstashFormatter extends NormalizerFormatter
     protected $contextPrefix;
 
 
-    public function __construct($systemName = null, $extraPrefix = null, $contextPrefix = 'ctxt_')
+    public function __construct($systemName = null, $applicationName = null, $extraPrefix = null, $contextPrefix = 'ctxt_')
     {
         //log stash requires a ISO 8601 format date
         parent::__construct('c');
 
         $this->systemName = $systemName ?: gethostname();
+        $this->applicationName = $applicationName;
 
         $this->extraPrefix = $extraPrefix;
         $this->contextPrefix = $contextPrefix;
@@ -62,6 +68,9 @@ class LogstashFormatter extends NormalizerFormatter
             '@source' => $this->systemName
           );
 
+        if (isset($this->applicationName)) {
+          $message['@type'] = $this->applicationName;
+        }
         $message['@fields'] = array();
         $message['@fields']['channel'] = $record['channel'];
         $message['@fields']['level'] = $record['level'];

tests/Monolog/Formatter/LogstashFormatterTest.php

@@ -96,7 +96,7 @@ class LogstashFormatterTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('logger', $message_array['ctxt_from']);
 
         // Test with extraPrefix
-        $formatter = new LogstashFormatter('test', null, 'CTX');
+        $formatter = new LogstashFormatter('test', null, null, 'CTX');
         $message = json_decode($formatter->format($record), true);
 
 
@@ -131,7 +131,7 @@ class LogstashFormatterTest extends \PHPUnit_Framework_TestCase
         $this->assertEquals('pair', $message_array['key']);
 
         // Test with extraPrefix
-        $formatter = new LogstashFormatter('test', 'EXT');
+        $formatter = new LogstashFormatter('test', null, 'EXT');
         $message = json_decode($formatter->format($record), true);
 
         $message_array = $message['@fields'];
@@ -139,4 +139,23 @@ class LogstashFormatterTest extends \PHPUnit_Framework_TestCase
         $this->assertArrayHasKey('EXTkey', $message_array);
         $this->assertEquals('pair', $message_array['EXTkey']);
     }
+
+    public function testFormatWithApplicationName()
+    {
+        $formatter = new LogstashFormatter('test', 'app');
+        $record = array(
+            'level' => Logger::ERROR,
+            'level_name' => 'ERROR',
+            'channel' => 'meh',
+            'context' => array('from' => 'logger'),
+            'datetime' => new \DateTime("@0"),
+            'extra' => array('key' => 'pair'),
+            'message' => 'log'
+        );
+
+        $message = json_decode($formatter->format($record), true);
+
+        $this->assertArrayHasKey('@type', $message);
+        $this->assertEquals('app', $message['@type']);
+    }
 }