From 735ad1242efd8ebb1b9758b24277ef0734edd1ed Mon Sep 17 00:00:00 2001
From: Alexander Vlasov <avlasov@sugarcrm.com>
Date: Tue, 15 May 2018 09:38:41 +0300
Subject: [PATCH] Detect if APC is enabled when trying to use APC storage.

---
 src/Prometheus/Storage/APC.php | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/src/Prometheus/Storage/APC.php b/src/Prometheus/Storage/APC.php
index b608e49..2c2de32 100644
--- a/src/Prometheus/Storage/APC.php
+++ b/src/Prometheus/Storage/APC.php
@@ -4,6 +4,7 @@
 namespace Prometheus\Storage;
 
 
+use Prometheus\Exception\StorageException;
 use Prometheus\MetricFamilySamples;
 use RuntimeException;
 
@@ -11,6 +12,16 @@ class APC implements Adapter
 {
     const PROMETHEUS_PREFIX = 'prom';
 
+    /**
+     * @throws StorageException
+     */
+    public function __construct()
+    {
+        if (!ini_get('apc.enabled') || ((php_sapi_name() == 'cli') && !ini_get('apc.enable_cli'))) {
+            throw new StorageException('APC is not enabled');
+        }
+    }
+
     /**
      * @return MetricFamilySamples[]
      */