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# coding: utf-8 |
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from django.conf import settings |
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from django.core.cache import caches |
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from django_th.my_services import MyService |
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class PublishingLimit(object): |
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""" |
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this class permits to reduce the quantity of data to be pulibshed |
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get the limit from settings.DJANGO_TH['publishing_limit'] |
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if the limit does not exist, it returns everything |
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""" |
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@staticmethod |
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def get_data(service, cache_data, trigger_id): |
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""" |
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get the data from the cache |
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:param service: the service name |
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:param cache_data: the data from the cache |
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:type trigger_id: integer |
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:return: Return the data from the cache |
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:rtype: object |
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""" |
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# rebuild the string |
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# th_<service>.my_<service>.Service<Service> |
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if service.startswith('th_'): |
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service_long = MyService.full_name(service) |
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# ... and check it |
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if service_long in settings.TH_SERVICES: |
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cache = caches['django_th'] |
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limit = settings.DJANGO_TH.get('publishing_limit', 0) |
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# publishing of all the data |
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if limit == 0: |
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return cache_data |
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# or just a set of them |
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if cache_data is not None and len(cache_data) > limit: |
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for data in cache_data[limit:]: |
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service_str = ''.join((service, '_', |
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str(trigger_id))) |
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# put that data in a version 2 of the cache |
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cache.set(service_str, data, version=2) |
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# delete data from cache version=1 |
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# https://niwinz.github.io/django-redis/latest/#_scan_delete_keys_in_bulk |
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cache.delete_pattern(service_str) |
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# put in cache unpublished data |
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cache_data = cache_data[:limit] |
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return cache_data |
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foxmask /
django-th
