<?php

/**
 * @file
 * Redis configuration.
 * @link http://helpdesk.getpantheon.com/customer/portal/articles/401317
 */

if (defined('DRUPAL_USE_REDIS')) {
    define('DRUPAL_REDIS_CACHE_MODE_SMALL', 1);
    define('DRUPAL_REDIS_CACHE_MODE_LARGE', 10);
    define('DRUPAL_REDIS_CACHE_MODE', DRUPAL_REDIS_CACHE_MODE_SMALL);

    // Redis base setup
    $conf['cache_backends'][] = 'sites/all/modules/contrib/redis/redis.autoload.inc';
    $conf['cache_backends'][] = 'sites/all/modules/contrib/cache_consistent/cache_consistent.inc';

    $conf['lock_inc'] = 'sites/all/modules/contrib/redis/redis.lock.inc';

    // Redis connection information
    $conf['redis_client_interface'] = 'PhpRedis';
    $conf['redis_client_host'] = DRUPAL_REDIS_HOST;
    $conf['redis_client_port'] = DRUPAL_REDIS_PORT;

    // Redis cache configuration.
    $conf['cache_default_class'] = 'ConsistentCache';
    $conf['cache_class_cache_form'] = 'Redis_Cache';
    $conf['cache_class_cache_page'] = 'Redis_Cache';

    $conf['consistent_cache_default_class'] = 'Redis_Cache';
    $conf['consistent_cache_buffer_mechanism'] = 'ConsistentCacheBuffer';
    $conf['consistent_cache_default_strict'] = FALSE;
    $conf['consistent_cache_strict_cache_bootstrap'] = TRUE;
    $conf['consistent_cache_default_safe'] = TRUE;

    $conf['cache_prefix'] = ['default' => DRUPAL_REDIS_PREFIX];

    // EntityCache setup.
    if ((boolean)file_exists('sites/all/modules/contrib/entitycache/entitycache.info') === true) {
        $conf['cache_entity_node'] = 'Redis_Cache';
        $conf['cache_entity_user'] = 'Redis_Cache';
        $conf['cache_entity_fieldable_panels_pane'] = 'Redis_Cache';
        $conf['cache_entity_file'] = 'Redis_Cache';
        $conf['cache_entity_taxonomy_term'] = 'Redis_Cache';
        $conf['cache_entity_taxonomy_vocabulary'] = 'Redis_Cache';
    }

    // Higher performance for smaller page counts. This technique does not execute
    // full Drupal bootstrapping and does not invoke the database, which ignores
    // database checks such as Drupal's IP blacklist.
    if (DRUPAL_REDIS_CACHE_MODE == DRUPAL_REDIS_CACHE_MODE_SMALL) {
        // High performance - no hook_boot(), no hook_exit(), ignores Drupal IP
        // blacklists.
        $conf['page_cache_without_database'] = true;
        $conf['page_cache_invoke_hooks'] = false;
        // Explicitly set page_cache_maximum_age as database won't be available.
        $conf['page_cache_maximum_age'] = 3600; // one hour
    }

    // Higher hit rate for larger page counts. This technique avoids evictions due
    // to redis space limitations when your site has a large quantity of pages to
    // cache. Will conflict with the first which skips the database entirely; do
    // not use both at the same time.
    elseif (DRUPAL_REDIS_CACHE_MODE == DRUPAL_REDIS_CACHE_MODE_LARGE) {
        // Use the database for cached HTML.
        $conf['cache_class_cache_page'] = 'DrupalDatabaseCache';
    }
}