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Add database cache for quotas

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This commit is contained in:
Raphael Michel
2017-10-04 09:45:37 +02:00
parent 330fadbea9
commit b920efc955
5 changed files with 102 additions and 4 deletions
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28
src/pretix/base/models/items.py
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@@ -704,6 +704,9 @@ class Quota(LoggedModel):
blank=True,
verbose_name=_("Variations")
)
cached_availability_state = models.PositiveIntegerField(null=True, blank=True)
cached_availability_number = models.PositiveIntegerField(null=True, blank=True)
cached_availability_time = models.DateTimeField(null=True, blank=True)
class Meta:
verbose_name = _("Quota")
@@ -718,11 +721,18 @@ class Quota(LoggedModel):
self.event.get_cache().clear()
def save(self, *args, **kwargs):
clear_cache = kwargs.pop('clear_cache', True)
super().save(*args, **kwargs)
if self.event:
if self.event and clear_cache:
self.event.get_cache().clear()
def availability(self, now_dt: datetime=None, count_waitinglist=True, _cache=None) -> Tuple[int, int]:
def cache_is_hot(self, now_dt=None):
now_dt = now_dt or now()
return self.cached_availability_time and (now_dt - self.cached_availability_time).total_seconds() < 120
def availability(
self, now_dt: datetime=None, count_waitinglist=True, _cache=None, allow_cache=False
) -> Tuple[int, int]:
"""
This method is used to determine whether Items or ItemVariations belonging
to this quota should currently be available for sale.
@@ -730,12 +740,26 @@ class Quota(LoggedModel):
:returns: a tuple where the first entry is one of the ``Quota.AVAILABILITY_`` constants
and the second is the number of available tickets.
"""
if allow_cache and self.cache_is_hot() and count_waitinglist:
return self.cached_availability_state, self.cached_availability_number
if _cache and count_waitinglist is not _cache.get('_count_waitinglist', True):
_cache.clear()
if _cache is not None and self.pk in _cache:
return _cache[self.pk]
now_dt = now_dt or now()
res = self._availability(now_dt, count_waitinglist)
if count_waitinglist and not self.cache_is_hot(now_dt):
self.cached_availability_state = res[0]
self.cached_availability_number = res[1]
self.cached_availability_time = now_dt
self.save(
update_fields=['cached_availability_state', 'cached_availability_number', 'cached_availability_time'],
clear_cache=False
)
if _cache is not None:
_cache[self.pk] = res
_cache['_count_waitinglist'] = count_waitinglist