Documented and tested FingersCrossedHandler

src/Monolog/Handler/FingersCrossedHandler.php

@@ -11,18 +11,29 @@
 
 namespace Monolog\Handler;
 
+use Monolog\Logger;
+
+/**
+ * FingersCrossedHandler buffers all messages until a certain level is reached
+ *
+ * The advantage of this approach is that you don't get any clutter in your log files.
+ * Only requests which actually trigger an error (or whatever your actionLevel is) will be
+ * in the logs, but they will contain all messages, not only those above the level threshold.
+ *
+ * @author Jordi Boggiano <j.boggiano@seld.be>
+ */
 class FingersCrossedHandler extends AbstractHandler
 {
     protected $handler;
     protected $actionLevel;
+    protected $buffering = true;
     protected $bufferSize;
-    protected $enabled = false;
     protected $buffer = array();
 
     /**
      * @param callback|HandlerInterface $handler Handler or factory callback($message, $fingersCrossedHandler).
-     * @param int $actionLevel the level at which this handler is triggered.
+     * @param int $actionLevel The level at which this handler is triggered.
-     * @param int $bufferSize how many entries should be buffered at most, beyond that the oldest items are removed from the buffer.
+     * @param int $bufferSize How many entries should be buffered at most, beyond that the oldest items are removed from the buffer.
      * @param Boolean $bubble
      */
     public function __construct($handler, $actionLevel = Logger::WARNING, $bufferSize = 0, $bubble = false)
@@ -33,15 +44,24 @@ class FingersCrossedHandler extends AbstractHandler
         $this->bubble = $bubble;
     }
 
+    /**
+     * Handles a message
+     *
+     * Messages are buffered until one of them matches the actionLevel. From then
+     * on, unless reset() is called, all messages are passed to the wrapped handler.
+     *
+     * @param array $message Message
+     * @return Boolean Whether the next handler in the stack should be called.
+     */
     public function handle($message)
     {
-        if (!$this->enabled) {
+        if ($this->buffering) {
             $this->buffer[] = $message;
             if ($this->bufferSize > 0 && count($this->buffer) > $this->bufferSize) {
                 array_shift($this->buffer);
             }
             if ($message['level'] >= $this->actionLevel) {
-                $this->enabled = true;
+                $this->buffering = false;
                 if (!$this->handler instanceof AbstractHandler) {
                     $this->handler = $this->handler($message, $this);
                 }
@@ -56,11 +76,17 @@ class FingersCrossedHandler extends AbstractHandler
         return false === $this->bubble;
     }
 
+    /**
+     * Resets the state of the handler. Stops forwarding messages to the wrapped handler.
+     */
     public function reset()
     {
-        $this->enabled = false;
+        $this->buffering = true;
     }
 
+    /**
+     * Implemented to comply with the AbstractHandler rqeuirements. Can not be called.
+     */
     public function write($message)
     {
         throw new \LogicException('This method should not be called directly on the FingersCrossedHandler.');

tests/Monolog/Handler/FingersCrossedHandlerTest.php

@@ -0,0 +1,65 @@
+<?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;
+
+class FingersCrossedHandlerTest extends \PHPUnit_Framework_TestCase
+{
+    public function testHandleBuffers()
+    {
+        $test = new TestHandler();
+        $handler = new FingersCrossedHandler($test);
+        $handler->handle($this->getMessage(Logger::DEBUG));
+        $handler->handle($this->getMessage(Logger::INFO));
+        $this->assertFalse($test->hasDebugMessages());
+        $this->assertFalse($test->hasInfoMessages());
+        $handler->handle($this->getMessage(Logger::WARNING));
+        $this->assertTrue($test->hasInfoMessages());
+        $this->assertTrue(count($test->getMessages()) === 3);
+    }
+
+    public function testHandleStopsBufferingAfterTrigger()
+    {
+        $test = new TestHandler();
+        $handler = new FingersCrossedHandler($test);
+        $handler->handle($this->getMessage(Logger::WARNING));
+        $handler->handle($this->getMessage(Logger::DEBUG));
+        $this->assertTrue($test->hasWarningMessages());
+        $this->assertTrue($test->hasDebugMessages());
+    }
+
+    public function testHandleBufferLimit()
+    {
+        $test = new TestHandler();
+        $handler = new FingersCrossedHandler($test, Logger::WARNING, 2);
+        $handler->handle($this->getMessage(Logger::DEBUG));
+        $handler->handle($this->getMessage(Logger::DEBUG));
+        $handler->handle($this->getMessage(Logger::INFO));
+        $handler->handle($this->getMessage(Logger::WARNING));
+        $this->assertTrue($test->hasWarningMessages());
+        $this->assertTrue($test->hasInfoMessages());
+        $this->assertFalse($test->hasDebugMessages());
+    }
+
+    protected function getMessage($level = Logger::WARNING)
+    {
+        return array(
+            'level' => $level,
+            'level_name' => 'WARNING',
+            'channel' => 'log',
+            'message' => 'foo',
+            'datetime' => new \DateTime,
+            'extra' => array(),
+        );
+    }
+}