33 lines
1.1 KiB
Python
33 lines
1.1 KiB
Python
"""
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Signal handlers for invalidating cached data.
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"""
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from django.dispatch.dispatcher import receiver
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from xmodule.modulestore.django import SignalHandler
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from .api import clear_course_from_cache
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from .tasks import update_course_in_cache
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@receiver(SignalHandler.course_published)
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def _listen_for_course_publish(sender, course_key, **kwargs): # pylint: disable=unused-argument
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"""
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Catches the signal that a course has been published in the module
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store and creates/updates the corresponding cache entry.
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"""
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clear_course_from_cache(course_key)
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# The countdown=0 kwarg ensures the call occurs after the signal emitter
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# has finished all operations.
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update_course_in_cache.apply_async([unicode(course_key)], countdown=0)
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@receiver(SignalHandler.course_deleted)
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def _listen_for_course_delete(sender, course_key, **kwargs): # pylint: disable=unused-argument
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"""
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Catches the signal that a course has been deleted from the
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module store and invalidates the corresponding cache entry if one
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exists.
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"""
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clear_course_from_cache(course_key)
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