use cache locks

feeds/models.py

@@ -1,6 +1,7 @@
 from django.conf import settings
 from django.contrib.contenttypes.fields import GenericForeignKey, GenericRelation
 from django.contrib.contenttypes.models import ContentType
+from django.core.cache import cache
 from django.db import models
 from django.utils import timezone
 from telebot import TeleBot
@@ -16,20 +17,26 @@ class Feed(models.Model):
     check_interval = models.DurationField(help_text='in seconds')
     last_check = models.DateTimeField(null=True, blank=True)
     last_id = YAMLField(null=True, blank=True)
-    lock = models.BooleanField(default=False)
 
     config_type = models.ForeignKey(ContentType, on_delete=models.CASCADE)
     config_id = models.PositiveIntegerField()
     config = GenericForeignKey('config_type', 'config_id')
 
+    @property
+    def lock_key(self):
+        return 'feed-{}-lock'.format(self.pk)
+
+    @property
+    def locked(self):
+        return bool(cache.get(self.lock_key))
+
     def run_check(self):
-        if self.lock:
+        if self.locked:
             return False
         if self.last_check and timezone.now() < self.last_check + self.check_interval:
             return False
 
-        self.lock = True
-        self.save()
+        cache.set(self.lock_key, 1, timeout=60)
         execute_feed.apply_async(args=(self.pk,), shadow=str(self))
         return True