[Update] Merge dev

apps/assets/models/user.py

@@ -119,6 +119,8 @@ class SystemUser(AssetUser):
     shell = models.CharField(max_length=64,  default='/bin/bash', verbose_name=_('Shell'))
     login_mode = models.CharField(choices=LOGIN_MODE_CHOICES, default=AUTO_LOGIN, max_length=10, verbose_name=_('Login mode'))
 
+    cache_key = "__SYSTEM_USER_CACHED_{}"
+
     def __str__(self):
         return '{0.name}({0.username})'.format(self)
 
@@ -155,6 +157,24 @@ class SystemUser(AssetUser):
         else:
             return False
 
+    def set_cache(self):
+        cache.set(self.cache_key.format(self.id), self, 3600)
+
+    def expire_cache(self):
+        cache.delete(self.cache_key.format(self.id))
+
+    @classmethod
+    def get_system_user_by_id_or_cached(cls, sid):
+        cached = cache.get(cls.cache_key.format(sid))
+        if cached:
+            return cached
+        try:
+            system_user = cls.objects.get(id=sid)
+            system_user.set_cache()
+            return system_user
+        except cls.DoesNotExist:
+            return None
+
     class Meta:
         ordering = ['name']
         unique_together = [('name', 'org_id')]