Initial

system/Cache/Handlers/PredisHandler.php

@@ -0,0 +1,227 @@
+<?php
+
+/**
+ * This file is part of CodeIgniter 4 framework.
+ *
+ * (c) CodeIgniter Foundation <admin@codeigniter.com>
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace CodeIgniter\Cache\Handlers;
+
+use CodeIgniter\Exceptions\CriticalError;
+use Config\Cache;
+use Exception;
+use Predis\Client;
+use Predis\Collection\Iterator\Keyspace;
+
+/**
+ * Predis cache handler
+ */
+class PredisHandler extends BaseHandler
+{
+    /**
+     * Default config
+     *
+     * @var array
+     */
+    protected $config = [
+        'scheme'   => 'tcp',
+        'host'     => '127.0.0.1',
+        'password' => null,
+        'port'     => 6379,
+        'timeout'  => 0,
+    ];
+
+    /**
+     * Predis connection
+     *
+     * @var Client
+     */
+    protected $redis;
+
+    public function __construct(Cache $config)
+    {
+        $this->prefix = $config->prefix;
+
+        if (isset($config->redis)) {
+            $this->config = array_merge($this->config, $config->redis);
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function initialize()
+    {
+        try {
+            $this->redis = new Client($this->config, ['prefix' => $this->prefix]);
+            $this->redis->time();
+        } catch (Exception $e) {
+            throw new CriticalError('Cache: Predis connection refused (' . $e->getMessage() . ').');
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function get(string $key)
+    {
+        $key = static::validateKey($key);
+
+        $data = array_combine(
+            ['__ci_type', '__ci_value'],
+            $this->redis->hmget($key, ['__ci_type', '__ci_value'])
+        );
+
+        if (! isset($data['__ci_type'], $data['__ci_value']) || $data['__ci_value'] === false) {
+            return null;
+        }
+
+        switch ($data['__ci_type']) {
+            case 'array':
+            case 'object':
+                return unserialize($data['__ci_value']);
+
+            case 'boolean':
+            case 'integer':
+            case 'double': // Yes, 'double' is returned and NOT 'float'
+            case 'string':
+            case 'NULL':
+                return settype($data['__ci_value'], $data['__ci_type']) ? $data['__ci_value'] : null;
+
+            case 'resource':
+            default:
+                return null;
+        }
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function save(string $key, $value, int $ttl = 60)
+    {
+        $key = static::validateKey($key);
+
+        switch ($dataType = gettype($value)) {
+            case 'array':
+            case 'object':
+                $value = serialize($value);
+                break;
+
+            case 'boolean':
+            case 'integer':
+            case 'double': // Yes, 'double' is returned and NOT 'float'
+            case 'string':
+            case 'NULL':
+                break;
+
+            case 'resource':
+            default:
+                return false;
+        }
+
+        if (! $this->redis->hmset($key, ['__ci_type' => $dataType, '__ci_value' => $value])) {
+            return false;
+        }
+
+        if ($ttl) {
+            $this->redis->expireat($key, time() + $ttl);
+        }
+
+        return true;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function delete(string $key)
+    {
+        $key = static::validateKey($key);
+
+        return $this->redis->del($key) === 1;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function deleteMatching(string $pattern)
+    {
+        $matchedKeys = [];
+
+        foreach (new Keyspace($this->redis, $pattern) as $key) {
+            $matchedKeys[] = $key;
+        }
+
+        return $this->redis->del($matchedKeys);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function increment(string $key, int $offset = 1)
+    {
+        $key = static::validateKey($key);
+
+        return $this->redis->hincrby($key, 'data', $offset);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function decrement(string $key, int $offset = 1)
+    {
+        $key = static::validateKey($key);
+
+        return $this->redis->hincrby($key, 'data', -$offset);
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function clean()
+    {
+        return $this->redis->flushdb()->getPayload() === 'OK';
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getCacheInfo()
+    {
+        return $this->redis->info();
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function getMetaData(string $key)
+    {
+        $key = static::validateKey($key);
+
+        $data = array_combine(['__ci_value'], $this->redis->hmget($key, ['__ci_value']));
+
+        if (isset($data['__ci_value']) && $data['__ci_value'] !== false) {
+            $time = time();
+            $ttl  = $this->redis->ttl($key);
+
+            return [
+                'expire' => $ttl > 0 ? time() + $ttl : null,
+                'mtime'  => $time,
+                'data'   => $data['__ci_value'],
+            ];
+        }
+
+        return null;
+    }
+
+    /**
+     * {@inheritDoc}
+     */
+    public function isSupported(): bool
+    {
+        return class_exists('Predis\Client');
+    }
+}