Expose the command hash strategy from the predis cluster class.

This will be useful to add, remove or change the handler used to
extract, validate and hash the keys of each command instance.

lib/Predis/Connection/PredisCluster.php

@@ -167,6 +167,17 @@ class PredisCluster implements ClusterConnectionInterface, \IteratorAggregate, \
         return $node;
     }
 
+    /**
+     * Returns the underlying command hash strategy used to hash
+     * commands by their keys.
+     *
+     * @return CommandHashStrategy
+     */
+    public function getCommandHashStrategy()
+    {
+        return $this->cmdHasher;
+    }
+
     /**
      * {@inheritdoc}
      */

tests/Predis/Connection/PredisClusterTest.php

@@ -21,6 +21,15 @@ use Predis\Profile\ServerProfile;
  */
 class PredisClusterTest extends StandardTestCase
 {
+    /**
+     * @group disconnected
+     */
+    public function testExposesCommandHashStrategy()
+    {
+        $cluster = new PredisCluster();
+        $this->assertInstanceOf('Predis\Command\Hash\CommandHashStrategy', $cluster->getCommandHashStrategy());
+    }
+
     /**
      * @group disconnected
      */