Show a message about setting up the cron and if there was an error running it (#425)

app/Services/CronService.php

@@ -0,0 +1,73 @@
+<?php
+
+namespace App\Services;
+
+use App\Contracts\Service;
+use App\Repositories\KvpRepository;
+use DateTime;
+use DateTimeZone;
+use Exception;
+use Illuminate\Support\Facades\Log;
+
+class CronService extends Service
+{
+    private $kvpRepo;
+
+    public function __construct(
+        KvpRepository $kvpRepo
+    ) {
+        $this->kvpRepo = $kvpRepo;
+    }
+
+    /**
+     * Get the path for running a cron job
+     *
+     * @return string
+     */
+    public function getCronPath(): string
+    {
+        $path = [
+            'cd '.base_path(),
+            '&&',
+            str_replace('-fpm', '', PHP_BINARY),
+            'artisan schedule:run',
+        ];
+
+        return implode(' ', $path);
+    }
+
+    /**
+     * Update the last time the cron was run in the kvp repo
+     */
+    public function updateLastRunTime()
+    {
+        $dt = new DateTime('now', DateTimeZone::UTC);
+        $this->kvpRepo->save('cron_last_run', $dt->format(DateTime::ISO8601));
+    }
+
+    /**
+     * True/false if there's a problem with the cron. Now this is mainly
+     * if the cron hasn't run in the last 5 minutes at least
+     *
+     * @return bool
+     */
+    public function cronProblemExists(): bool
+    {
+        $last_run = $this->kvpRepo->get('cron_last_run');
+        if (empty($last_run)) {
+            return true;
+        }
+
+        try {
+            $dt = DateTime::createFromFormat(DateTime::ISO8601, $last_run);
+            $dt_now = new DateTime('now', DateTimeZone::UTC);
+        } catch (Exception $e) {
+            Log::error('Error checking for cron problem: '.$e->getMessage());
+            return true;
+        }
+
+        // More than 5 minutes... there's a problem
+        $diff = $dt_now->diff($dt);
+        return $diff->i > 5;
+    }
+}