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96 lines
3.1 KiB
Python
96 lines
3.1 KiB
Python
import random
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from datetime import timedelta
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from cacheops.signals import cache_invalidated, cache_read
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from django.conf import settings
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from django.utils import timezone
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from django_prometheus.models import model_deletes, model_inserts, model_updates
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from prometheus_client import Counter
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from .choices import ObjectChangeActionChoices
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from .models import ObjectChange
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from .webhooks import enqueue_webhooks
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#
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# Change logging/webhooks
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#
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def _handle_changed_object(request, sender, instance, **kwargs):
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"""
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Fires when an object is created or updated.
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"""
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# Queue the object for processing once the request completes
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if kwargs.get('created'):
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action = ObjectChangeActionChoices.ACTION_CREATE
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elif 'created' in kwargs:
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action = ObjectChangeActionChoices.ACTION_UPDATE
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elif kwargs.get('action') in ['post_add', 'post_remove'] and kwargs['pk_set']:
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# m2m_changed with objects added or removed
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action = ObjectChangeActionChoices.ACTION_UPDATE
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else:
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return
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# Record an ObjectChange if applicable
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if hasattr(instance, 'to_objectchange'):
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objectchange = instance.to_objectchange(action)
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objectchange.user = request.user
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objectchange.request_id = request.id
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objectchange.save()
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# Enqueue webhooks
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enqueue_webhooks(instance, request.user, request.id, action)
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# Increment metric counters
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if action == ObjectChangeActionChoices.ACTION_CREATE:
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model_inserts.labels(instance._meta.model_name).inc()
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elif action == ObjectChangeActionChoices.ACTION_UPDATE:
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model_updates.labels(instance._meta.model_name).inc()
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# Housekeeping: 0.1% chance of clearing out expired ObjectChanges
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if settings.CHANGELOG_RETENTION and random.randint(1, 1000) == 1:
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cutoff = timezone.now() - timedelta(days=settings.CHANGELOG_RETENTION)
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ObjectChange.objects.filter(time__lt=cutoff).delete()
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def _handle_deleted_object(request, sender, instance, **kwargs):
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"""
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Fires when an object is deleted.
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"""
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# Record an ObjectChange if applicable
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if hasattr(instance, 'to_objectchange'):
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objectchange = instance.to_objectchange(ObjectChangeActionChoices.ACTION_DELETE)
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objectchange.user = request.user
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objectchange.request_id = request.id
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objectchange.save()
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# Enqueue webhooks
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enqueue_webhooks(instance, request.user, request.id, ObjectChangeActionChoices.ACTION_DELETE)
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# Increment metric counters
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model_deletes.labels(instance._meta.model_name).inc()
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#
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# Caching
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#
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cacheops_cache_hit = Counter('cacheops_cache_hit', 'Number of cache hits')
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cacheops_cache_miss = Counter('cacheops_cache_miss', 'Number of cache misses')
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cacheops_cache_invalidated = Counter('cacheops_cache_invalidated', 'Number of cache invalidations')
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def cache_read_collector(sender, func, hit, **kwargs):
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if hit:
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cacheops_cache_hit.inc()
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else:
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cacheops_cache_miss.inc()
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def cache_invalidated_collector(sender, obj_dict, **kwargs):
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cacheops_cache_invalidated.inc()
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cache_read.connect(cache_read_collector)
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cache_invalidated.connect(cache_invalidated_collector)
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