Caching stuff.

misuzu.php

@@ -135,6 +135,7 @@ if (PHP_SAPI === 'cli') {
         exit;
     }
 
+    $app->startCache();
     $app->startTemplating();
     $tpl = $app->getTemplating();
 

public/index.php

@@ -1,11 +1,11 @@
 <?php
+use Misuzu\Cache;
 use Misuzu\Database;
 
 require_once __DIR__ . '/../misuzu.php';
 
 $config = $app->getConfig();
 $tpl = $app->getTemplating();
-$db = Database::connection();
 
 if ($config->get('Site', 'embed_linked_data', 'bool', false)) {
     $tpl->vars([
@@ -17,7 +17,7 @@ if ($config->get('Site', 'embed_linked_data', 'bool', false)) {
     ]);
 }
 
-$featuredNews = $db->query('
+$news = Database::query('
     SELECT
         p.`post_id`, p.`post_title`, p.`post_text`, p.`created_at`,
         u.`user_id`, u.`username`,
@@ -32,46 +32,49 @@ $featuredNews = $db->query('
     LIMIT 3
 ')->fetchAll(PDO::FETCH_ASSOC);
 
-$usersCount = (int)$db->query('
-    SELECT COUNT(`user_id`)
-    FROM `msz_users`
-')->fetchColumn();
+$statistics = Cache::instance()->get('index:stats:v1', function () {
+    return [
+        'users' => (int)Database::query('
+            SELECT COUNT(`user_id`)
+            FROM `msz_users`
+        ')->fetchColumn(),
+        'lastUser' => Database::query('
+            SELECT
+                u.`user_id`, u.`username`, u.`created_at`,
+                COALESCE(r.`role_colour`, CAST(0x40000000 AS UNSIGNED)) as `user_colour`
+            FROM `msz_users` as u
+            LEFT JOIN `msz_roles` as r
+            ON r.`role_id` = u.`display_role`
+            ORDER BY u.`user_id` DESC
+            LIMIT 1
+        ')->fetch(PDO::FETCH_ASSOC),
+    ];
+}, 10800);
 
-$lastUser = $db->query('
-    SELECT
-        u.`user_id`, u.`username`, u.`created_at`,
-        COALESCE(r.`role_colour`, CAST(0x40000000 AS UNSIGNED)) as `user_colour`
-    FROM `msz_users` as u
-    LEFT JOIN `msz_roles` as r
-    ON r.`role_id` = u.`display_role`
-    ORDER BY u.`user_id` DESC
-    LIMIT 1
-')->fetch(PDO::FETCH_ASSOC);
-
-$featuredChangelog = $db->query('
-    SELECT
-        c.`change_id`, c.`change_log`,
-        a.`action_name`, a.`action_colour`, a.`action_class`,
-        DATE(`change_created`) as `change_date`,
-        !ISNULL(c.`change_text`) as `change_has_text`
-    FROM `msz_changelog_changes` as c
-    LEFT JOIN `msz_changelog_actions` as a
-    ON a.`action_id` = c.`action_id`
-    WHERE DATE(c.`change_created`) >= (
-         SELECT DATE(`change_created`)
-         FROM `msz_changelog_changes`
-         GROUP BY DATE(`change_created`)
-         ORDER BY `change_created` DESC
-         LIMIT 2, 1
-    )
-    ORDER BY c.`change_created` DESC
-')->fetchAll(PDO::FETCH_ASSOC);
-
-//var_dump(Database::connection()->query('SHOW SESSION STATUS LIKE "Questions"')->fetch()['Value']);
+$changelog = Cache::instance()->get('index:changelog:v1', function () {
+    return Database::query('
+        SELECT
+            c.`change_id`, c.`change_log`,
+            a.`action_name`, a.`action_colour`, a.`action_class`,
+            DATE(`change_created`) as `change_date`,
+            !ISNULL(c.`change_text`) as `change_has_text`
+        FROM `msz_changelog_changes` as c
+        LEFT JOIN `msz_changelog_actions` as a
+        ON a.`action_id` = c.`action_id`
+        WHERE DATE(c.`change_created`) >= (
+            SELECT DATE(`change_created`)
+            FROM `msz_changelog_changes`
+            GROUP BY DATE(`change_created`)
+            ORDER BY `change_created` DESC
+            LIMIT 2, 1
+        )
+        ORDER BY c.`change_created` DESC
+    ')->fetchAll(PDO::FETCH_ASSOC);
+}, 1800);
 
 echo $tpl->render('home.index', [
-    'users_count' => $usersCount,
-    'last_user' => $lastUser,
-    'featured_changelog' => $featuredChangelog,
-    'featured_news' => $featuredNews,
+    'users_count' => $statistics['users'],
+    'last_user' => $statistics['lastUser'],
+    'featured_changelog' => $changelog,
+    'featured_news' => $news,
 ]);

src/Application.php

@@ -217,12 +217,30 @@ class Application extends ApplicationBase
     public function startDatabase(): void
     {
         if (Database::hasInstance()) {
-            throw new UnexpectedValueException('Database module has already been started.');
+            throw new UnexpectedValueException('Database has already been started.');
         }
 
         new Database($this->configInstance, self::DATABASE_CONNECTIONS[0]);
     }
 
+    /**
+     * Sets up the caching stuff.
+     */
+    public function startCache(): void
+    {
+        if (Cache::hasInstance()) {
+            throw new UnexpectedValueException('Cache has already been started.');
+        }
+
+        new Cache(
+            $this->configInstance->get('Cache', 'host', 'string', null),
+            $this->configInstance->get('Cache', 'port', 'int', null),
+            $this->configInstance->get('Cache', 'database', 'int', null),
+            $this->configInstance->get('Cache', 'password', 'string', null),
+            $this->configInstance->get('Cache', 'prefix', 'string', '')
+        );
+    }
+
     /**
      * Sets up the templating engine module.
      */

src/Cache.php

@@ -0,0 +1,127 @@
+<?php
+namespace Misuzu;
+
+use Misuzu\Config\ConfigManager;
+use Redis;
+use InvalidArgumentException;
+use UnexpectedValueException;
+
+final class Cache
+{
+    /**
+     * @var Cache
+     */
+    private static $instance;
+
+    private $redis;
+
+    public static function instance(): Cache
+    {
+        if (!self::hasInstance()) {
+            throw new UnexpectedValueException('No instance of Cache exists yet.');
+        }
+
+        return self::$instance;
+    }
+
+    public function getRedis(): Redis
+    {
+        return $this->redis;
+    }
+
+    public static function hasInstance(): bool
+    {
+        return self::$instance instanceof static;
+    }
+
+    public function __construct(
+        string $host,
+        ?int $port = null,
+        ?int $database = null,
+        ?string $password = null,
+        string $prefix = ''
+    ) {
+        if (self::hasInstance()) {
+            throw new UnexpectedValueException('Only one instance of Cache may exist.');
+        }
+
+        self::$instance = $this;
+        $this->redis = new Redis;
+        $this->redis->connect($host, $port);
+
+        if ($password !== null && !$this->redis->auth($password)) {
+            throw new InvalidArgumentException('Redis auth failed.');
+        }
+
+        if ($database !== null && !$this->redis->select($database)) {
+            throw new UnexpectedValueException('Redis select failed.');
+        }
+
+        $this->redis->setOption(Redis::OPT_SERIALIZER, Redis::SERIALIZER_PHP);
+        $this->redis->setOption(Redis::OPT_PREFIX, $prefix);
+    }
+
+    public function __destruct()
+    {
+        $this->redis->close();
+        self::$instance = null;
+    }
+
+    public function set(string $key, $value, int $ttl = 0)
+    {
+        if (is_callable($value)) {
+            $value = $value();
+        }
+
+        if ($ttl < 0) {
+            return $value;
+        } elseif ($ttl < 1) {
+            $this->redis->set($key, $value);
+        } else {
+            $this->redis->setEx($key, $ttl, $value);
+        }
+
+        return $value;
+    }
+
+    public function exists(string $key): bool
+    {
+        return $this->redis->exists($key);
+    }
+
+    public function delete($keys): int
+    {
+        return $this->redis->delete($keys);
+    }
+
+    public function increment(string $key, int $amount = 1): int
+    {
+        if ($amount <= 1) {
+            return $this->redis->incr($key);
+        }
+
+        return $this->redis->incrBy($key, $amount);
+    }
+
+    public function decrement(string $key, int $amount = 1): int
+    {
+        if ($amount <= 1) {
+            return $this->redis->decr($key);
+        }
+
+        return $this->redis->decrBy($key, $amount);
+    }
+
+    public function get(string $key, $fallback, int $ttl = 0)
+    {
+        if ($ttl < 0) {
+            return is_callable($fallback) ? $fallback() : $fallback;
+        }
+
+        if (!$this->exists($key)) {
+            return $this->set($key, $fallback, $ttl);
+        }
+
+        return $this->redis->get($key);
+    }
+}

src/Database.php

@@ -3,7 +3,9 @@ namespace Misuzu;
 
 use Misuzu\Config\ConfigManager;
 use PDO;
+use PDOStatement;
 use InvalidArgumentException;
+use UnexpectedValueException;
 
 final class Database
 {
@@ -48,7 +50,7 @@ final class Database
     public static function getInstance(): Database
     {
         if (!self::hasInstance()) {
-            throw new \UnexpectedValueException('No instance of Database exists yet.');
+            throw new UnexpectedValueException('No instance of Database exists yet.');
         }
 
         return self::$instance;
@@ -63,8 +65,8 @@ final class Database
         ConfigManager $config,
         string $default = 'default'
     ) {
-        if (self::$instance instanceof static) {
-            throw new \UnexpectedValueException('Only one instance of Database may exist.');
+        if (self::hasInstance()) {
+            throw new UnexpectedValueException('Only one instance of Database may exist.');
         }
 
         self::$instance = $this;
@@ -77,6 +79,26 @@ final class Database
         return self::getInstance()->getConnection($name);
     }
 
+    public static function prepare(string $statement, ?string $connection = null, $options = []): PDOStatement
+    {
+        return self::connection($connection)->prepare($statement, $options);
+    }
+
+    public static function query(string $statement, ?string $connection = null): PDOStatement
+    {
+        return self::connection($connection)->query($statement);
+    }
+
+    public static function exec(string $statement, ?string $connection = null)
+    {
+        return self::connection($connection)->exec($statement);
+    }
+
+    public static function queryCount(?string $connection = null): int
+    {
+        return (int)Database::query('SHOW SESSION STATUS LIKE "Questions"', $connection)->fetch()['Value'];
+    }
+
     public function getConnection(?string $name = null): PDO
     {
         $name = $name ?? $this->default;

src/TemplateEngine.php

@@ -167,6 +167,10 @@ class TemplateEngine
      */
     public function render(string $path, ?array $vars = null): string
     {
+        if ($this->twig->isDebug()) {
+            $this->var('query_count', Database::queryCount());
+        }
+
         $path = self::fixPath($path);
 
         if ($vars !== null) {

views/manage/master.twig

@@ -67,6 +67,9 @@
                 ''|date('Y') }} /
                 {{ ('https://github.com/flashwave/misuzu/tree/' ~ git_branch())|html_link(git_branch(), 'footer__link')|raw }}
                 # {{ ('https://github.com/flashwave/misuzu/commit/' ~ git_commit_hash(true))|html_link(git_commit_hash(), 'footer__link')|raw }}
+                {% if query_count is defined %}
+                    / SQL Queries: {{ query_count|number_format }}
+                {% endif %}
             </footer>
         </div>
         <script src="/js/libraries.js" charset="utf-8"></script>

views/mio/master.twig

@@ -70,6 +70,9 @@
                     ''|date('Y') }} /
                     {{ ('https://github.com/flashwave/misuzu/tree/' ~ git_branch())|html_link(git_branch(), 'footer__copyright__link') }}
                     # {{ ('https://github.com/flashwave/misuzu/commit/' ~ git_commit_hash(true))|html_link(git_commit_hash(), 'footer__copyright__link') }}
+                    {% if query_count is defined %}
+                        / SQL Queries: {{ query_count|number_format }}
+                    {% endif %}
                 </div>
 
                 <div class="footer__links">