Added MandrillHandler for sending log messages to the Mandrill API

composer.json

@@ -34,7 +34,8 @@
         "ext-amqp": "Allow sending log messages to an AMQP server (1.0+ required)",
         "ext-mongo": "Allow sending log messages to a MongoDB server",
         "aws/aws-sdk-php": "Allow sending log messages to AWS services like DynamoDB",
-        "rollbar/rollbar": "Allow sending log messages to Rollbar"
+        "rollbar/rollbar": "Allow sending log messages to Rollbar",
+        "guzzlehttp/guzzle": "Allow sending log messages to Mandrill"
     },
     "autoload": {
         "psr-4": {"Monolog\\": "src/Monolog"}

src/Monolog/Handler/MandrillHandler.php

@@ -0,0 +1,64 @@
+<?php
+
+/*
+ * 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\Handler;
+
+use Monolog\Logger;
+use GuzzleHttp\Client;
+
+/**
+ * MandrillHandler uses GuzzleHttp to send the emails to the Mandrill API
+ *
+ * @author Adam Nicholson <adamnicholson10@gmail.com>
+ */
+class MandrillHandler extends MailHandler
+{
+    protected $client;
+    protected $message;
+
+    /**
+     * @param \GuzzleHttp\Client      $client  The Guzzle client
+     * @oaram string                  $apiKey  A valid Mandrill API key
+     * @param callable|\Swift_Message $message An example message for real messages, only the body will be replaced
+     * @param integer                 $level   The minimum logging level at which this handler will be triggered
+     * @param Boolean                 $bubble  Whether the messages that are handled can bubble up the stack or not
+     */
+    public function __construct(Client $client, $apiKey, $message, $level = Logger::ERROR, $bubble = true)
+    {
+        parent::__construct($level, $bubble);
+        $this->client  = $client;
+        if (!$message instanceof \Swift_Message && is_callable($message)) {
+            $message = call_user_func($message);
+        }
+        if (!$message instanceof \Swift_Message) {
+            throw new \InvalidArgumentException('You must provide either a Swift_Message instance or a callable returning it');
+        }
+        $this->message = $message;
+        $this->apiKey = $apiKey;
+    }
+
+    /**
+     * {@inheritdoc}
+     */
+    protected function send($content, array $records)
+    {
+        $message = clone $this->message;
+        $message->setBody($content);
+
+        $this->client->post('https://mandrillapp.com/api/1.0/messages/send-raw.json', [
+            'body' => [
+                'key' => $this->apiKey,
+                'raw_message' => (string) $message,
+                'async' => false,
+            ],
+        ]);
+    }
+}