Implement wp_cache_get_multiple() for WP 5.5

README.md

@@ -2,8 +2,8 @@
 **Contributors:** getpantheon, danielbachhuber, mboynes, Outlandish Josh  
 **Tags:** cache, plugin, redis  
 **Requires at least:** 3.0.1  
-**Tested up to:** 5.4  
-**Stable tag:** 1.0.1  
+**Tested up to:** 5.5  
+**Stable tag:** 1.1.0  
 **License:** GPLv2 or later  
 **License URI:** http://www.gnu.org/licenses/gpl-2.0.html  
 
@@ -107,6 +107,10 @@ There's a known issue with WordPress `alloptions` cache design. Specifically, a
 
 ## Changelog ##
 
+### 1.1.0 (July 13, 2020) ###
+* Implements `wp_cache_get_multiple()` for WordPress 5.5 [[#287](https://github.com/pantheon-systems/wp-redis/pull/287)].
+* Bails early when connecting to Redis throws an Exception to avoid fatal error [[285](https://github.com/pantheon-systems/wp-redis/pull/285)].
+
 ### 1.0.1 (April 14, 2020) ###
 * Adds support for specifying Redis database number from environment/server variables [[#273](https://github.com/pantheon-systems/wp-redis/pull/273)].
 

object-cache.php

@@ -133,6 +133,24 @@ function wp_cache_get( $key, $group = '', $force = false, &$found = null ) {
 	return $wp_object_cache->get( $key, $group, $force, $found );
 }
 
+/**
+ * Retrieves multiple values from the cache in one call.
+ *
+ * @see WP_Object_Cache::get_multiple()
+ * @global WP_Object_Cache $wp_object_cache Object cache global instance.
+ *
+ * @param array  $keys  Array of keys under which the cache contents are stored.
+ * @param string $group Optional. Where the cache contents are grouped. Default empty.
+ * @param bool   $force Optional. Whether to force an update of the local cache
+ *                      from the persistent cache. Default false.
+ * @return array Array of values organized into groups.
+ */
+function wp_cache_get_multiple( $keys, $group = '', $force = false ) {
+	global $wp_object_cache;
+
+	return $wp_object_cache->get_multiple( $keys, $group, $force );
+}
+
 /**
  * Increment numeric cache item's value
  *
@@ -644,6 +662,74 @@ public function get( $key, $group = 'default', $force = false, &$found = null )
 		return $value;
 	}
 
+	/**
+	 * Retrieves multiple values from the cache in one call.
+	 *
+	 * @param array  $keys  Array of keys under which the cache contents are stored.
+	 * @param string $group Optional. Where the cache contents are grouped. Default empty.
+	 * @param bool   $force Optional. Whether to force an update of the local cache
+	 *                      from the persistent cache. Default false.
+	 * @return array Array of values organized into groups.
+	 */
+	public function get_multiple( $keys, $group = 'default', $force = false ) {
+		if ( empty( $group ) ) {
+			$group = 'default';
+		}
+
+		$cache = array();
+		if ( ! $this->_should_persist( $group ) ) {
+			foreach ( $keys as $key ) {
+				$cache[ $key ] = $this->_isset_internal( $key, $group ) ? $this->_get_internal( $key, $group ) : false;
+				false !== $cache[ $key ] ? $this->cache_hits++ : $this->cache_misses++;
+			}
+			return $cache;
+		}
+
+		// Attempt to fetch values from the internal cache.
+		if ( ! $force ) {
+			foreach ( $keys as $key ) {
+				if ( $this->_isset_internal( $key, $group ) ) {
+					$cache[ $key ] = $this->_get_internal( $key, $group );
+					$this->cache_hits++;
+				}
+			}
+		}
+		$remaining_keys = array_diff( $keys, array_keys( $cache ) );
+		// If all keys were satisfied by the internal cache, we're sorted.
+		if ( empty( $remaining_keys ) ) {
+			return $cache;
+		}
+		if ( $this->_should_use_redis_hashes( $group ) ) {
+			$redis_safe_group = $this->_key( '', $group );
+			$results          = $this->_call_redis( 'hmGet', $redis_safe_group, $remaining_keys );
+		} else {
+			$ids = array();
+			foreach ( $remaining_keys as $key ) {
+				$ids[] = $this->_key( $key, $group );
+			}
+			$results = $this->_call_redis( 'mget', $ids );
+		}
+		// Process the results from the Redis call.
+		foreach ( $remaining_keys as $i => $key ) {
+			$value = isset( $results[ $i ] ) ? $results[ $i ] : false;
+			if ( false !== $value ) {
+				// All non-numeric values are serialized
+				$value = is_numeric( $value ) ? intval( $value ) : unserialize( $value );
+				$this->_set_internal( $key, $group, $value );
+				$this->cache_hits++;
+			} else {
+				$this->cache_misses++;
+			}
+			$cache[ $key ] = $value;
+		}
+		// Make sure return values are returned in the order of the passed keys.
+		$return_cache = array();
+		foreach ( $keys as $key ) {
+			$return_cache[ $key ] = isset( $cache[ $key ] ) ? $cache[ $key ] : false;
+		}
+		return $return_cache;
+	}
+
 	/**
 	 * Increment numeric cache item's value
 	 *
@@ -1239,7 +1325,9 @@ protected function _call_redis( $method ) {
 			case 'IsConnected':
 			case 'exists':
 			case 'get':
+			case 'mget':
 			case 'hGet':
+			case 'hmGet':
 				return false;
 		}
 

readme.txt

@@ -2,8 +2,8 @@
 Contributors: getpantheon, danielbachhuber, mboynes, Outlandish Josh
 Tags: cache, plugin, redis
 Requires at least: 3.0.1
-Tested up to: 5.4
-Stable tag: 1.0.1
+Tested up to: 5.5
+Stable tag: 1.1.0
 License: GPLv2 or later
 License URI: http://www.gnu.org/licenses/gpl-2.0.html
 
@@ -107,6 +107,10 @@ There's a known issue with WordPress `alloptions` cache design. Specifically, a
 
 == Changelog ==
 
+= 1.1.0 (July 13, 2020) =
+* Implements `wp_cache_get_multiple()` for WordPress 5.5 [[#287](https://github.com/pantheon-systems/wp-redis/pull/287)].
+* Bails early when connecting to Redis throws an Exception to avoid fatal error [[285](https://github.com/pantheon-systems/wp-redis/pull/285)].
+
 = 1.0.1 (April 14, 2020) =
 * Adds support for specifying Redis database number from environment/server variables [[#273](https://github.com/pantheon-systems/wp-redis/pull/273)].
 

tests/phpunit/test-cache.php

@@ -11,6 +11,8 @@ class CacheTest extends WP_UnitTestCase {
 
 	private static $get_key;
 
+	private static $mget_key;
+
 	private static $set_key;
 
 	private static $incr_by_key;
@@ -43,6 +45,7 @@ public function setUp() {
 
 		self::$exists_key  = WP_Object_Cache::USE_GROUPS ? 'hExists' : 'exists';
 		self::$get_key     = WP_Object_Cache::USE_GROUPS ? 'hGet' : 'get';
+		self::$mget_key    = WP_Object_Cache::USE_GROUPS ? 'hmGet' : 'mget';
 		self::$set_key     = WP_Object_Cache::USE_GROUPS ? 'hSet' : 'set';
 		self::$incr_by_key = WP_Object_Cache::USE_GROUPS ? 'hIncrBy' : 'incrBy';
 		// 'hIncrBy' isn't a typo here — Redis doesn't support decrBy on groups
@@ -756,6 +759,53 @@ public function test_get_found() {
 		$this->assertEquals( 1, $this->cache->cache_misses );
 	}
 
+	public function test_get_multiple() {
+		$this->cache->set( 'foo1', 'bar', 'group1' );
+		$this->cache->set( 'foo2', 'bar', 'group1' );
+		$this->cache->set( 'foo1', 'bar', 'group2' );
+
+		$found = $this->cache->get_multiple( array( 'foo1', 'foo2', 'foo3' ), 'group1' );
+
+		$expected = array(
+			'foo1' => 'bar',
+			'foo2' => 'bar',
+			'foo3' => false,
+		);
+
+		$this->assertSame( $expected, $found );
+		$this->assertEquals( 2, $this->cache->cache_hits );
+		$this->assertEquals( 1, $this->cache->cache_misses );
+		if ( $this->cache->is_redis_connected ) {
+			$this->assertEquals(
+				array(
+					self::$mget_key => 1,
+					self::$set_key  => 3,
+				),
+				$this->cache->redis_calls
+			);
+		} else {
+			$this->assertEmpty( $this->cache->redis_calls );
+		}
+	}
+
+	public function test_get_multiple_non_persistent() {
+		$this->cache->add_non_persistent_groups( array( 'group1' ) );
+		$this->cache->set( 'foo1', 'bar', 'group1' );
+		$this->cache->set( 'foo2', 'bar', 'group1' );
+
+		$found = $this->cache->get_multiple( array( 'foo1', 'foo2', 'foo3' ), 'group1' );
+
+		$expected = array(
+			'foo1' => 'bar',
+			'foo2' => 'bar',
+			'foo3' => false,
+		);
+		$this->assertSame( $expected, $found );
+		$this->assertEquals( 2, $this->cache->cache_hits );
+		$this->assertEquals( 1, $this->cache->cache_misses );
+		$this->assertEmpty( $this->cache->redis_calls );
+	}
+
 	public function test_incr() {
 		$key = rand_str();
 

wp-redis.php

@@ -3,7 +3,7 @@
  * Plugin Name: WP Redis
  * Plugin URI: http://github.com/pantheon-systems/wp-redis/
  * Description: WordPress Object Cache using Redis. Requires the PhpRedis extension (https://github.com/phpredis/phpredis).
- * Version: 1.0.1
+ * Version: 1.1.0
  * Author: Pantheon, Josh Koenig, Matthew Boynes, Daniel Bachhuber, Alley Interactive
  * Author URI: https://pantheon.io/
  */