爬虫开发

app/Services/Crawler/CrawlRuleScheduleService.php

@@ -0,0 +1,44 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Crawler;
+
+use App\Models\CrawlRule;
+use Carbon\CarbonImmutable;
+use Cron\CronExpression;
+
+class CrawlRuleScheduleService
+{
+    public function isDue(CrawlRule $rule, ?CarbonImmutable $now = null): bool
+    {
+        if (! $rule->enabled) {
+            return false;
+        }
+
+        $now ??= CarbonImmutable::now($rule->timezone ?: 'Asia/Shanghai');
+
+        try {
+            $cron = new CronExpression($rule->cron_expression);
+        } catch (\Throwable) {
+            return false;
+        }
+
+        return $cron->isDue($now);
+    }
+
+    public function nextRunAt(CrawlRule $rule, ?CarbonImmutable $from = null): ?CarbonImmutable
+    {
+        $from ??= CarbonImmutable::now($rule->timezone ?: 'Asia/Shanghai');
+
+        try {
+            $cron = new CronExpression($rule->cron_expression);
+            $next = CarbonImmutable::instance($cron->getNextRunDate($from));
+        } catch (\Throwable) {
+            return null;
+        }
+
+        return $next->setTimezone('UTC');
+    }
+}
+