From d95d78f5a261fbf97f422d6e5c14b496620bedaf Mon Sep 17 00:00:00 2001
From: Ming Tsay <mt@mingtsay.tw>
Date: Sun, 27 Aug 2023 21:53:01 +0800
Subject: [PATCH] add Discord Me cache

---
 app/App.php   |  4 +++-
 app/Redis.php | 54 +++++++++++++++++++++++++++++++++++++++++++++++++++
 composer.json |  1 +
 composer.lock |  3 ++-
 4 files changed, 60 insertions(+), 2 deletions(-)
 create mode 100644 app/Redis.php

diff --git a/app/App.php b/app/App.php
index d10c3e5..f05f3ff 100644
--- a/app/App.php
+++ b/app/App.php
@@ -128,7 +128,9 @@ HTML,
         try {
             $u = static::getU();
             if ($u === null) return null;
-            return Auth::getMe($u);
+            $cachedMe = Redis::getCachedMe($_COOKIE['u']);
+            if ($cachedMe === null) return Redis::cacheMe($_COOKIE['u'], Auth::getMe($u));
+            return $cachedMe;
         } catch (Exception) {
             error_log('Failed to getMe.');
             return null;
diff --git a/app/Redis.php b/app/Redis.php
new file mode 100644
index 0000000..5981b3c
--- /dev/null
+++ b/app/Redis.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace MingTsay\Akanyan;
+
+use MingTsay\Akanyan\Discord\Me;
+
+require_once __DIR__ . '/../env.php';
+
+class Redis
+{
+  public const PREFIX = 'akanyan:discord:me:';
+  public const TTL = 600; // 10 minutes
+    protected static ?\Redis $redis = null;
+
+    /**
+     * @throws \RedisException
+     */
+    protected static function connect(): \Redis
+    {
+        if (static::$redis === null) {
+            static::$redis = new \Redis();
+            static::$redis->connect('127.0.0.1');
+        }
+        return static::$redis;
+    }
+
+    protected static function getKey(string $u): string
+    {
+        return static::PREFIX . md5($u);
+    }
+
+    public static function getCachedMe(string $u): ?Me
+    {
+        try {
+            $redis = static::connect();
+            return unserialize($redis->get(static::getKey($u))) ?: null;
+        } catch (\RedisException $e) {
+            trigger_error($e->getMessage());
+            return null;
+        }
+    }
+
+    public static function cacheMe(string $u, ?Me $me): ?Me
+    {
+        try {
+            $redis = static::connect();
+            $redis->setEx(static::getKey($u), static::TTL, serialize($me));
+            return $me;
+        } catch (\RedisException $e) {
+            trigger_error($e->getMessage());
+            return null;
+        }
+    }
+}
diff --git a/composer.json b/composer.json
index 489df28..2426099 100644
--- a/composer.json
+++ b/composer.json
@@ -11,6 +11,7 @@
   ],
   "require": {
     "ext-iconv": "*",
+    "ext-redis": "*",
     "ext-sodium": "*",
     "ext-zlib": "*",
     "components/font-awesome": "^6.1",
diff --git a/composer.lock b/composer.lock
index 4a443b7..47588c1 100644
--- a/composer.lock
+++ b/composer.lock
@@ -4,7 +4,7 @@
         "Read more about it at https://getcomposer.org/doc/01-basic-usage.md#installing-dependencies",
         "This file is @generated automatically"
     ],
-    "content-hash": "528c716c3d44b77191eaef0461fe108d",
+    "content-hash": "94e36763cae319a07395535f9c2373eb",
     "packages": [
         {
             "name": "components/font-awesome",
@@ -734,6 +734,7 @@
     "prefer-lowest": false,
     "platform": {
         "ext-iconv": "*",
+        "ext-redis": "*",
         "ext-sodium": "*",
         "ext-zlib": "*"
     },