[feature] add host processor

doc/02-handlers-formatters-processors.md

@@ -155,6 +155,7 @@
 - [_GitProcessor_](../src/Monolog/Processor/GitProcessor.php): Adds the current git branch and commit to a log record.
 - [_MercurialProcessor_](../src/Monolog/Processor/MercurialProcessor.php): Adds the current hg branch and commit to a log record.
 - [_TagProcessor_](../src/Monolog/Processor/TagProcessor.php): Adds an array of predefined tags to a log record.
+- [_HostnameProcessor_](../src/Monolog/Processor/HostnameProcessor.php): Adds the current hostname to a log record.
 
 ## Third Party Packages
 

src/Monolog/Processor/HostnameProcessor.php

@@ -0,0 +1,34 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Processor;
+
+use Monolog\Logger;
+
+/**
+ * Injects value of gethostname in all records
+ */
+class HostnameProcessor
+{
+    private static $host;
+
+    public function __construct()
+    {
+        self::$host = (string) gethostname();
+    }
+
+    public function __invoke(array $record): array
+    {
+        $record['extra']['hostname'] = self::$host;
+
+        return $record;
+    }
+}

tests/Monolog/Processor/HostnameProcessorTest.php

@@ -0,0 +1,30 @@
+<?php declare(strict_types=1);
+
+/*
+ * This file is part of the Monolog package.
+ *
+ * (c) Jordi Boggiano <j.boggiano@seld.be>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Monolog\Processor;
+
+use Monolog\Test\TestCase;
+
+class HostnameProcessorTest extends TestCase
+{
+    /**
+     * @covers Monolog\Processor\HostnameProcessor::__invoke
+     */
+    public function testProcessor()
+    {
+        $processor = new HostnameProcessor();
+        $record = $processor($this->getRecord());
+        $this->assertArrayHasKey('hostname', $record['extra']);
+        $this->assertInternalType('string', $record['extra']['hostname']);
+        $this->assertNotEmpty($record['extra']['hostname']);
+        $this->assertEquals(gethostname(), $record['extra']['hostname']);
+    }
+}