## [0.18.0] - 2020-02-21

### Add
- Add `RedisCache`

CHANGELOG.md

@@ -4,6 +4,10 @@ All notable changes to this project will be documented in this file.
 The format is based on [Keep a Changelog](http://keepachangelog.com/en/1.0.0/)
 and this project adheres to [Semantic Versioning](http://semver.org/spec/v2.0.0.html).
 
+## [0.18.0] - 2020-02-21
+### Add
+- Add `RedisCache`
+
 ## [0.17.6] - 2020-02-20
 ### Add
 - Add Function `getQueueAttributes` and Dto `SqsQueueAttributeDto` in `SqsService`

composer.json

@@ -13,7 +13,8 @@
     "ext-json": "*",
     "mailgun/mailgun-php": "^2.8.1",
     "symfony/http-foundation": "^2.8.50|^3.4.26|^4.3",
-    "firebase/php-jwt": "^4.0|^5.0"
+    "firebase/php-jwt": "^4.0|^5.0",
+    "predis/predis": "^1.1"
   },
   "autoload": {
     "psr-4": {

lib/Cache/RedisCache.php

@@ -0,0 +1,62 @@
+<?php
+declare(strict_types=1);
+
+namespace Ridibooks\Platform\Common\Cache;
+
+use Predis\Client;
+
+class RedisCache
+{
+    /** @var Client|null */
+    private $client;
+
+    public function __construct(string $host, int $port = 6379)
+    {
+        try {
+            $this->client = new Client(['scheme' => 'tcp', 'host' => $host, 'port' => $port,]);
+        } catch (\Exception $e) {
+            $this->client = null;
+            trigger_error($e->getMessage());
+        }
+    }
+
+    public function get(string $key): ?string
+    {
+        try {
+            if ($this->client !== null) {
+                return $this->client->get($key);
+            }
+        } catch (\Exception $e) {
+            trigger_error($e->getMessage());
+            if ($this->client !== null && !$this->client->isConnected()) {
+                $this->client->connect();
+            }
+        }
+
+        return null;
+    }
+
+    public function setJson(string $key, array $value, int $ttl): void
+    {
+        $this->set($key, json_encode($value), $ttl);
+    }
+
+    public function set(string $key, string $value, int $ttl): void
+    {
+        try {
+            if ($this->client !== null) {
+                // setnx()은 호출 시점에서 해당하는 key-value가 존재하지 않는 경우에만 set이 성공한다.
+                // set 성공 시 return 1, 실패 시 return 0
+                $result = $this->client->setnx($key, $value);
+                if ($result === 1) {
+                    $this->client->expire($key, $ttl);
+                }
+            }
+        } catch (\Exception $e) {
+            trigger_error($e->getMessage());
+            if ($this->client !== null && !$this->client->isConnected()) {
+                $this->client->connect();
+            }
+        }
+    }
+}