bug #23237 [Cache] Fix Predis client cluster with pipeline (flolivaud)

This PR was merged into the 3.3 branch.

Discussion
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[Cache] Fix Predis client cluster with pipeline

| Q             | A
| ------------- | ---
| Branch?       | 3.3
| Bug fix?      | yes
| New feature?  | no
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | n/a
| License       | MIT
| Doc PR        | n/a

Commits
-------

a85d5b0 Fix Predis client cluster with pipeline

src/Symfony/Component/Cache/Traits/RedisTrait.php

@@ -12,6 +12,7 @@
 namespace Symfony\Component\Cache\Traits;
 
 use Predis\Connection\Factory;
+use Predis\Connection\Aggregate\ClusterInterface;
 use Predis\Connection\Aggregate\PredisCluster;
 use Predis\Connection\Aggregate\RedisCluster;
 use Predis\Response\Status;
@@ -284,7 +285,7 @@ private function pipeline(\Closure $generator)
     {
         $ids = array();
 
-        if ($this->redis instanceof \Predis\Client) {
+        if ($this->redis instanceof \Predis\Client && !$this->redis->getConnection() instanceof ClusterInterface) {
             $results = $this->redis->pipeline(function ($redis) use ($generator, &$ids) {
                 foreach ($generator() as $command => $args) {
                     call_user_func_array(array($redis, $command), $args);
@@ -308,9 +309,10 @@ private function pipeline(\Closure $generator)
             foreach ($results as $k => list($h, $c)) {
                 $results[$k] = $connections[$h][$c];
             }
-        } elseif ($this->redis instanceof \RedisCluster) {
-            // phpredis doesn't support pipelining with RedisCluster
+        } elseif ($this->redis instanceof \RedisCluster || ($this->redis instanceof \Predis\Client && $this->redis->getConnection() instanceof ClusterInterface)) {
+            // phpredis & predis don't support pipelining with RedisCluster
             // see https://github.com/phpredis/phpredis/blob/develop/cluster.markdown#pipelining
+            // see https://github.com/nrk/predis/issues/267#issuecomment-123781423
             $results = array();
             foreach ($generator() as $command => $args) {
                 $results[] = call_user_func_array(array($this->redis, $command), $args);