From c9a9d82bbc966c97876c2b6d5bc94ae3f4b4135f Mon Sep 17 00:00:00 2001
From: Andrey Andreev <narf@devilix.net>
Date: Wed, 5 Jan 2022 22:49:24 +0200
Subject: Fix #5562

---
 system/libraries/Cache/drivers/Cache_redis.php | 28 +++++++++++---------------
 user_guide_src/source/changelog.rst            |  5 +++++
 2 files changed, 17 insertions(+), 16 deletions(-)

diff --git a/system/libraries/Cache/drivers/Cache_redis.php b/system/libraries/Cache/drivers/Cache_redis.php
index 9b082d11b..e541237e3 100644
--- a/system/libraries/Cache/drivers/Cache_redis.php
+++ b/system/libraries/Cache/drivers/Cache_redis.php
@@ -95,6 +95,7 @@ class CI_Cache_redis extends CI_Driver
 	 * if a Redis connection can't be established.
 	 *
 	 * @return	void
+	 * @throws	RedisException
 	 * @see		Redis::connect()
 	 */
 	public function __construct()
@@ -132,26 +133,21 @@ class CI_Cache_redis extends CI_Driver
 
 		$this->_redis = new Redis();
 
-		try
+		// The following calls used to be wrapped in a try ... catch
+		// and just log an error, but that only causes more errors later.
+		if ( ! $this->_redis->connect($config['host'], ($config['host'][0] === '/' ? 0 : $config['port']), $config['timeout']))
 		{
-			if ( ! $this->_redis->connect($config['host'], ($config['host'][0] === '/' ? 0 : $config['port']), $config['timeout']))
-			{
-				log_message('error', 'Cache: Redis connection failed. Check your configuration.');
-			}
-
-			if (isset($config['password']) && ! $this->_redis->auth($config['password']))
-			{
-				log_message('error', 'Cache: Redis authentication failed.');
-			}
+			log_message('error', 'Cache: Redis connection failed. Check your configuration.');
+		}
 
-			if (isset($config['database']) && $config['database'] > 0 && ! $this->_redis->select($config['database']))
-			{
-				log_message('error', 'Cache: Redis select database failed.');
-			}
+		if (isset($config['password']) && ! $this->_redis->auth($config['password']))
+		{
+			log_message('error', 'Cache: Redis authentication failed.');
 		}
-		catch (RedisException $e)
+
+		if (isset($config['database']) && $config['database'] > 0 && ! $this->_redis->select($config['database']))
 		{
-			log_message('error', 'Cache: Redis connection refused ('.$e->getMessage().')');
+			log_message('error', 'Cache: Redis select database failed.');
 		}
 	}
 
diff --git a/user_guide_src/source/changelog.rst b/user_guide_src/source/changelog.rst
index 3e858feb3..2a729264e 100644
--- a/user_guide_src/source/changelog.rst
+++ b/user_guide_src/source/changelog.rst
@@ -135,6 +135,11 @@ Release Date: Not Released
       - Added ability to generate ``data:image/png;base64`` URIs instead of writing image files to disk.
       - Updated to always create PNG images instead of JPEG.
 
+Bug fixes for 3.2.0
+===================
+
+-  Fixed a bug (#5562) - :doc:`Cache Library <libraries/caching>` 'redis' driver would pointlessly attempt to perform its functions if a connection to the Redis server failed.
+
 Version 3.1.12
 ==============
 
-- 
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