Metrics: Add database access time

src/Controllers/Metrics/Controller.php

@@ -131,6 +131,11 @@ class Controller extends BaseController
             'messages'             => ['type' => 'gauge', $this->stats->messages()],
             'password_resets'      => ['type' => 'gauge', $this->stats->passwordResets()],
             'registration_enabled' => ['type' => 'gauge', $this->config->get('registration_enabled')],
+            'database'             => [
+                'type' => 'gauge',
+                ['labels' => ['type' => 'read'], 'value' => $this->stats->databaseRead()],
+                ['labels' => ['type' => 'write'], 'value' => $this->stats->databaseWrite()],
+            ],
             'sessions'             => ['type' => 'gauge', $this->stats->sessions()],
             'log_entries'          => [
                 'type' => 'counter',

src/Controllers/Metrics/Stats.php

@@ -2,7 +2,9 @@
 
 namespace Engelsystem\Controllers\Metrics;
 
+use Carbon\Carbon;
 use Engelsystem\Database\Database;
+use Engelsystem\Models\EventConfig;
 use Illuminate\Database\Query\Builder as QueryBuilder;
 use Illuminate\Database\Query\Expression as QueryExpression;
 
@@ -262,6 +264,35 @@ class Stats
             ->count();
     }
 
+    /**
+     * @return float
+     */
+    public function databaseRead()
+    {
+        $start = microtime(true);
+
+        EventConfig::findOrNew('last_metrics');
+
+        return microtime(true) - $start;
+    }
+
+    /**
+     * @return float
+     */
+    public function databaseWrite()
+    {
+        $config = EventConfig::findOrNew('last_metrics');
+        $config
+            ->setAttribute('name', 'last_metrics')
+            ->setAttribute('value', new Carbon());
+
+        $start = microtime(true);
+
+        $config->save();
+
+        return microtime(true) - $start;
+    }
+
     /**
      * @param string $level
      * @return int

src/Models/EventConfig.php

@@ -35,6 +35,7 @@ class EventConfig extends BaseModel
         'event_start'   => 'date',
         'event_end'     => 'date',
         'teardown_end'  => 'date',
+        'last_metrics'  => 'datetime',
     ];
 
     /** @var bool It could be interesting to know when a value changed the last time */

tests/Unit/Controllers/Metrics/ControllerTest.php

@@ -54,6 +54,7 @@ class ControllerTest extends TestCase
                 $this->assertArrayHasKey('messages', $data);
                 $this->assertArrayHasKey('password_resets', $data);
                 $this->assertArrayHasKey('registration_enabled', $data);
+                $this->assertArrayHasKey('database', $data);
                 $this->assertArrayHasKey('sessions', $data);
                 $this->assertArrayHasKey('log_entries', $data);
                 $this->assertArrayHasKey('scrape_duration_seconds', $data);

tests/Unit/Controllers/Metrics/StatsTest.php

@@ -108,6 +108,25 @@ class StatsTest extends TestCase
         $this->assertEquals(4, $stats->sessions());
     }
 
+    /**
+     * @covers \Engelsystem\Controllers\Metrics\Stats::databaseRead
+     * @covers \Engelsystem\Controllers\Metrics\Stats::databaseWrite
+     */
+    public function testDatabase()
+    {
+        $this->initDatabase();
+
+        $stats = new Stats($this->database);
+
+        $read = $stats->databaseRead();
+        $write = $stats->databaseWrite();
+
+        $this->assertIsFloat($read);
+        $this->assertNotEmpty($read);
+        $this->assertIsFloat($write);
+        $this->assertNotEmpty($write);
+    }
+
     /**
      * @covers \Engelsystem\Controllers\Metrics\Stats::logEntries
      */