Added PsrHandler

This handler allows applications introducing Monolog to continue using
their existing PSR-3 compliant logger(s) in conjunction with the various
Monolog handlers available.

src/Monolog/Handler/PsrHandler.php

@@ -0,0 +1,57 @@
+<?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 Psr\Log\LoggerInterface;
+
+/**
+ * Proxies log messages to an existing PSR-3 compliant logger.
+ *
+ * @author Michael Moussa <michael.moussa@gmail.com>
+ */
+class PsrHandler extends AbstractHandler
+{
+    /**
+     * PSR-3 compliant logger
+     *
+     * @var LoggerInterface
+     */
+    protected $logger;
+
+    /**
+     * @param LoggerInterface $logger The underlying PSR-3 compliant logger to which messages will be proxied
+     * @param int             $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(LoggerInterface $logger, $level = Logger::DEBUG, $bubble = true)
+    {
+        parent::__construct($level, $bubble);
+
+        $this->logger = $logger;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function handle(array $record)
+    {
+        if (!$this->isHandling($record)) {
+            return false;
+        }
+
+        $logMethodName = strtolower($record['level_name']);
+        call_user_func([$this->logger, $logMethodName], $record['message'], $record['context']);
+
+        return false === $this->bubble;
+    }
+}